Create Pagination util & make DiscussionListState and DiscussionList use it

I'm 100% sure that this code can be improved by a ton. Just pushing this so we can potentially work off of it.
Some stuff taken from PR #1829.
Does *not* have changing URL query parameter - this code is already a disaster.

.gitignore

@@ -7,3 +7,4 @@ Thumbs.db
 /tests/integration/tmp
 .vagrant
 .idea/*
+.vscode

CHANGELOG.md

@@ -1,5 +1,170 @@
 # Changelog
 
+## [0.1.0-beta.15](https://github.com/flarum/core/compare/v0.1.0-beta.14.1...v0.1.0-beta.15)
+
+### Added
+
+- Slug drivers support (https://github.com/flarum/core/pull/2456).
+- Notification type extender (https://github.com/flarum/core/pull/2424).
+- Validation extender (https://github.com/flarum/core/pull/2102).
+- Post extender (https://github.com/flarum/core/pull/2101).
+- Notification channel extender (https://github.com/flarum/core/pull/2432).
+- Service provider extender (https://github.com/flarum/core/pull/2437).
+- API serializer extender (https://github.com/flarum/core/pull/2438).
+- User preferences extender (https://github.com/flarum/core/pull/2463).
+- Settings extender (https://github.com/flarum/core/pull/2452).
+- ApiController extender (https://github.com/flarum/core/pull/2451).
+- Model visibility extender (https://github.com/flarum/core/pull/2460).
+- Policy extender (https://github.com/flarum/core/pull/2461).
+
+### Changed
+
+- Time helpers converted to Typescript (https://github.com/flarum/core/pull/2391).
+- Improved the formatter extender (https://github.com/flarum/core/pull/2098).
+- Improve wording on installer when facing file permission issues (https://github.com/flarum/core/pull/2435).
+- Background color of checkbox toggles improved for better usability (https://github.com/flarum/core/pull/2443).
+- Route resolving refactored (https://github.com/flarum/core/pull/2425).
+- Administration panel UX refactored (https://github.com/flarum/core/pull/2409).
+- Floodgate moved to middleware and extender added (https://github.com/flarum/core/pull/2170).
+- DRY up image uploading logic (https://github.com/flarum/core/pull/2477).
+- Process isolation on testing (https://github.com/flarum/core/commit/984f751c718c89501cc09857bc271efa2c7eea8c).
+- Forum and admin javascript exports namespaced (https://github.com/flarum/core/pull/2488).
+
+### Fixed
+
+- Web updater does not take into account subfolder installations (https://github.com/flarum/core/pull/2426).
+- Callables handling in extenders failed (https://github.com/flarum/core/pull/2423).
+- Scrolling on mobile from PostSteam changes didn't work correctly (https://github.com/flarum/core/pull/2385).
+- Side pane covers part of the discussion page due to `app.discussions` being empty (https://github.com/flarum/core/commit/102e76b084bf47fdfb4c73f95e1fbb322537f7aa).
+- Change email modal keeps showing the previous error message even on success (https://github.com/flarum/core/pull/2467).
+- Comment count not updated when discussions are deleted (https://github.com/flarum/core/pull/2472).
+- `goToIndex` in PostStream does not trigger an xhr to retrieve new data (https://github.com/flarum/core/commit/09e2736cbcc267594b660beabbd001d9030f9880).
+- On refresh the post number is reduced by one (https://github.com/flarum/core/pull/2476).
+- Queue worker would instantiate a new Queue factory, not the bound one (https://github.com/flarum/core/pull/2481).
+- Header accidentally has a border bottom (https://github.com/flarum/core/pull/2489).
+- Namespace mentioned in docblock is incorrect (https://github.com/flarum/core/pull/2494).
+- Scrolling inside longer discussions (especially Firefox) skips posts (https://github.com/flarum/core/commit/210a6b3e253d7917bd1eacd3ed8d2f95073ae99d).
+- Uploading avatars that are jpg/jpeg fails with a validation error (https://github.com/flarum/core/pull/2497).
+
+### Removed
+
+- MomentJS alias (https://github.com/flarum/core/pull/2428).
+- Deprecated user events `GetDisplayName` and `PrepareUserGroups` (https://github.com/flarum/core/pull/2428).
+- AssertPermissionTrait (https://github.com/flarum/core/pull/2428).
+- Path related helpers and methods in Application (https://github.com/flarum/core/pull/2428).
+- Backward compatibility layers from the frontend rewrite (https://github.com/flarum/core/pull/2428).
+
+### Deprecated
+
+- `CheckingForFlooding` (https://github.com/flarum/core/commit/8e25bcb68f86cc992c46dfa70368419fe9f936ac).
+
+## [0.1.0-beta.14.1](https://github.com/flarum/core/compare/v0.1.0-beta.14...v0.1.0-beta.14.1)
+
+### Fixed
+
+- SuperTextarea component is not exported.
+- Symfony dependencies do not match those depended on by Laravel (https://github.com/flarum/core/pull/2407).
+- Scripts from textformatter aren't executed (https://github.com/flarum/core/pull/2415)
+- Sub path installations have no page title.
+- Losing focus of Composer area when coming from fullscreen.
+
+## [0.1.0-beta.14](https://github.com/flarum/core/compare/v0.1.0-beta.13...v0.1.0-beta.14)
+
+### Added
+
+- Check dependencies before enabling / disabling extensions (https://github.com/flarum/core/pull/2188)
+- Set up temporary infrastructure for TypeScript in core (https://github.com/flarum/core/pull/2206)
+- Better UI for request error modals (https://github.com/flarum/core/pull/1929)
+- Display name extender, tests, frontend UI (https://github.com/flarum/core/pull/2174)
+- Scroll to post or show alert when editing a post from another page (https://github.com/flarum/core/pull/2108)
+- Feature to test email config by sending an email to the current user (https://github.com/flarum/core/pull/2023)
+- Allow searching users by group ID using the group gambit (https://github.com/flarum/core/pull/2192)
+- Use `liveHumanTimes` helper to update times without reload/rerender (https://github.com/flarum/core/pull/2208)
+- View extender, tests (https://github.com/flarum/core/pull/2134)
+- User extender to replace `PrepareUserGroups` (https://github.com/flarum/core/pull/2110)
+- Increase extensibility of skeleton PHP (https://github.com/flarum/core/pull/2308, https://github.com/flarum/core/pull/2318)
+- Pass a translator instance to `getEmailSubject` in `MailableInterface` (https://github.com/flarum/core/pull/2244)
+- Force LF line endings on windows (https://github.com/flarum/core/pull/2321)
+- Add a `Link` component for internal and external links (https://github.com/flarum/core/pull/2315)
+- `ConfirmDocumentUnload` component
+- Error handler middleware can now be manipulated by the middleware extender
+
+### Changed
+
+- Update to Mithril 2 (https://github.com/flarum/core/pull/2255)
+- Stop storing component instances (https://github.com/flarum/core/issues/1821, https://github.com/flarum/core/issues/2144)
+- Update to Laravel 6.x (https://github.com/flarum/core/issues/2055)
+- `Flarum\Foundation\Application` no longer implements `Illuminate\Contracts\Foundation\Application` (#2142)
+- `Flarum\Foundation\Application` no longer inherits `Illuminate\Container\Container` (#2142)
+- `paths` have been split off from `Flarum\Foundation\Application` into `Flarum\Foundation\Paths`, which can be injected where needed  (#2142)
+- `Flarum\User\Gate` no longer implements `Illuminate\Contracts\Auth\Access\Gate` (https://github.com/flarum/core/pull/2181)
+- Improve Group Gambit performance (https://github.com/flarum/core/pull/2192)
+- Switch to `dayjs` from `momentjs` (https://github.com/flarum/core/pull/2219)
+- Don't create a `bio` column in `users` for new installations (https://github.com/flarum/core/pull/2215)
+- Start converting core JS to TypeScript (https://github.com/flarum/core/pull/2207)
+- Make Carbon an explicit dependency (https://github.com/flarum/core/commit/3b39c212e0fef7522e7d541a9214ff3817138d5d)
+- Use Symfony's translator interface instead of Laravel's (https://github.com/flarum/core/pull/2243)
+- Use newer versions of fontawesome (https://github.com/flarum/core/pull/2274)
+- Use URL generator instead of `app()->url()` where possible (https://github.com/flarum/core/pull/2302)
+- Move config from `config.php` into an injectable helper class (https://github.com/flarum/core/pull/2271)
+- Use reserved TLD for bogus and test urls (https://github.com/flarum/core/commit/6860b24b70bd04544dde90e537ce021a5fc5a689)
+- Replace `m.stream` with `flarum/utils/Stream` (https://github.com/flarum/core/pull/2316)
+- Replace `affixedSidebar` util with `AffixedSidebar` component
+- Replace `m.withAttr` with `flarum/utils/withAttr`
+- Scroll Listener is now passive, performance improvement (https://github.com/flarum/core/pull/2387)
+
+### Fixed
+
+- `generate:migration` command for extensions (https://github.com/flarum/core/commit/443949f7b9d7558dbc1e0994cb898cbac59bec87)
+- Container config for `UninstalledSite` (https://github.com/flarum/core/commit/ecdce44d555dd36a365fd472b2916e677ef173cf)
+- Tooltip glitch on page chang (https://github.com/flarum/core/issues/2118)
+- Using multiple extenders in tests (https://github.com/flarum/core/commit/c4f4f218bf4b175a30880b807f9ccb1a37a25330)
+- Header glitch when opening modals (https://github.com/flarum/core/pull/2131)
+- Ensure `SameSite` is explicitly set for cookies (https://github.com/flarum/core/pull/2159)
+- Ensure `Flarum\User\Event\AvatarChanged` event is properly dispatched (https://github.com/flarum/core/pull/2197)
+- Show correct error message on wrong password when changing email (https://github.com/flarum/core/pull/2171)
+- Discussion unreadCount could be higher than commentCount if posts deleted (https://github.com/flarum/core/pull/2195)
+- Don't show page title on the default route (https://github.com/flarum/core/pull/2047)
+- Add page title to `All Discussions` page when it isn't the default route (https://github.com/flarum/core/pull/2047)
+- Accept `'0'` as `false` for `flarum/components/Checkbox` (https://github.com/flarum/core/pull/2210)
+- Fix PostStreamScrubber background (https://github.com/flarum/core/pull/2222)
+- Test port on BaseUrl tests (https://github.com/flarum/core/pull/2226)
+- `UrlGenerator` can now generate urls with optional parameters (https://github.com/flarum/core/pull/2246)
+- Allow `less` to be compiled independently of Flarum (https://github.com/flarum/core/pull/2252)
+- Use correct number abbreviation (https://github.com/flarum/core/pull/2261)
+- Ensure avatar html uses alt tags for accessibility (https://github.com/flarum/core/pull/2269)
+- Escape regex when searching (https://github.com/flarum/core/pull/2273)
+- Remove unneeded semicolons inserted during JS compilation (https://github.com/flarum/core/pull/2280)
+- Don't require a username/password for SMTP (https://github.com/flarum/core/pull/2287)
+- Allow uppercase entries for SMTP encryption validation (https://github.com/flarum/core/pull/2289)
+- Ensure that the right number of posts is returned from list posts API (https://github.com/flarum/core/pull/2291)
+- Fix a variety of PostStream bugs (https://github.com/flarum/core/pull/2160, https://github.com/flarum/core/pull/2160)
+- Sliding discussion glitch on mobile (https://github.com/flarum/core/pull/2324)
+- Sliding discussion button in wrong place (https://github.com/flarum/core/pull/2330, https://github.com/flarum/core/pull/2383)
+- Sliding discussion glitch on mobile (https://github.com/flarum/core/pull/2381)
+- Fix PostStream for posts with top margins, and scrubber position when scrolling below posts (https://github.com/flarum/core/pull/2369)
+
+### Removed
+
+- `Flarum\Event\AbstractConfigureRoutes` event class
+- `Flarum\Event\ConfigureApiRoutes` event class
+- `Flarum\Event\ConfigureForumRoutes` event class
+- `Flarum\Console\Event\Configuring` event class
+- `Flarum\Event\ConfigureModelDates` event class
+- `Flarum\Event\ConfigureLocales` event class
+- `Flarum\Event\ConfigureModelDefaultAttributes` event class
+- `Flarum\Event\GetModelRelationship` event class
+- `Flarum\User\Event\BioChanged` event class
+- `Flarum\Database\MigrationServiceProvider` moved into `Flarum\Database\DatabaseServiceProvider`
+- Unused `admin/components/Widget` component (`admin/component/DashboardWidget` should be used instead)
+- Mandrill mail driver (https://github.com/flarum/core/commit/bca833d3f1c34d45d95bf905902368a2753b8908)
+
+### Deprecated
+
+- `Flarum\User\Event\GetDisplayName` event class
+- Global path helpers, `Flarum\Foundation\Application` path methods (https://github.com/flarum/core/pull/2155)
+- `Flarum\User\AssertPermissionTrait` (https://github.com/flarum/core/pull/2044)
+
 ## [0.1.0-beta.13](https://github.com/flarum/core/compare/v0.1.0-beta.12...v0.1.0-beta.13)
 
 ### Added

composer.json

@@ -10,7 +10,7 @@
             "email": "franz@develophp.org"
         },
         {
-            "name": "Daniel Klabbers",
+            "name": "Daniël Klabbers",
             "email": "daniel@klabbers.email",
             "homepage": "https://luceos.com"
         },
@@ -27,6 +27,10 @@
         {
             "name": "Matthew Kilgore",
             "email": "matthew@kilgore.dev"
+        },
+        {
+          "name": "Alexander (Sasha) Skvortsov",
+          "email": "askvortsov@flarum.org"
         }
     ],
     "support": {
@@ -72,11 +76,12 @@
         "psr/http-server-handler": "^1.0",
         "psr/http-server-middleware": "^1.0",
         "s9e/text-formatter": "^2.3.6",
-        "symfony/config": "^3.3",
-        "symfony/console": "^4.2",
-        "symfony/event-dispatcher": "^4.3.2",
-        "symfony/translation": "^3.3",
-        "symfony/yaml": "^3.3",
+        "symfony/config": "^4.3.4",
+        "symfony/console": "^4.3.4",
+        "symfony/event-dispatcher": "^4.3.4",
+        "symfony/mime": "^5.2.0",
+        "symfony/translation": "^4.3.4",
+        "symfony/yaml": "^4.3.4",
         "tobscure/json-api": "^0.3.0",
         "wikimedia/less.php": "^3.0"
     },

js/package-lock.json

@@ -3382,9 +3382,9 @@
       "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
     },
     "ini": {
-      "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.5.tgz",
-      "integrity": "sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw=="
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.8.tgz",
+      "integrity": "sha512-JV/yugV2uzW5iMRSiZAyDtQd+nxtUnjeLt0acNdw98kKLrvuRVyB80tsREOE7yvGVgalhZ6RNXCmEHkUKBKxew=="
     },
     "interpret": {
       "version": "1.2.0",
@@ -3556,9 +3556,9 @@
       "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8="
     },
     "jquery": {
-      "version": "3.4.1",
-      "resolved": "https://registry.npmjs.org/jquery/-/jquery-3.4.1.tgz",
-      "integrity": "sha512-36+AdBzCL+y6qjw5Tx7HgzeGCzC81MDDgaUP8ld2zhx58HdqXGoBd+tHdrBMiyjGQs0Hxs/MLZTu/eHNJJuWPw=="
+      "version": "3.5.1",
+      "resolved": "https://registry.npmjs.org/jquery/-/jquery-3.5.1.tgz",
+      "integrity": "sha512-XwIBPqcMn57FxfT+Go5pzySnm4KWkT1Tv7gjrpT1srtf8Weynl6R273VJ5GjkRb51IzMp5nbaPjJXMWeju2MKg=="
     },
     "jquery.hotkeys": {
       "version": "0.1.0",
@@ -4546,11 +4546,6 @@
       "integrity": "sha512-mUdIBBvdn0PLOeP3TEkMH7HHeUP3GjsXCwKarjv/kGmUFOYg1VqEemKhoQpWMu6X2I8kHeuVdGibLGkVK+/5Qw==",
       "dev": true
     },
-    "serialize-javascript": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-2.1.2.tgz",
-      "integrity": "sha512-rs9OggEUF0V4jUSecXazOYsLfu7OGK2qIn3c7IPBiffz32XniEp/TX9Xmc9LQfK2nQ2QKHvZ2oygKUGU0lG4jQ=="
-    },
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
@@ -4900,21 +4895,29 @@
       }
     },
     "terser-webpack-plugin": {
-      "version": "1.4.3",
-      "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-1.4.3.tgz",
-      "integrity": "sha512-QMxecFz/gHQwteWwSo5nTc6UaICqN1bMedC5sMtUc7y3Ha3Q8y6ZO0iCR8pq4RJC8Hjf0FEPEHZqcMB/+DFCrA==",
+      "version": "1.4.5",
+      "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-1.4.5.tgz",
+      "integrity": "sha512-04Rfe496lN8EYruwi6oPQkG0vo8C+HT49X687FZnpPF0qMAIHONI6HEXYPKDOE8e5HjXTyKfqRd/agHtH0kOtw==",
       "requires": {
         "cacache": "^12.0.2",
         "find-cache-dir": "^2.1.0",
         "is-wsl": "^1.1.0",
         "schema-utils": "^1.0.0",
-        "serialize-javascript": "^2.1.2",
+        "serialize-javascript": "^4.0.0",
         "source-map": "^0.6.1",
         "terser": "^4.1.2",
         "webpack-sources": "^1.4.0",
         "worker-farm": "^1.7.0"
       },
       "dependencies": {
+        "serialize-javascript": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-4.0.0.tgz",
+          "integrity": "sha512-GaNA54380uFefWghODBWEGisLZFj00nS5ACs6yHa9nLqlLpVLO8ChDGeKRjZnV4Nh4n0Qi7nhYZD/9fCPzEqkw==",
+          "requires": {
+            "randombytes": "^2.1.0"
+          }
+        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",

js/package.json

@@ -10,7 +10,7 @@
     "dayjs": "^1.8.28",
     "expose-loader": "^0.7.5",
     "flarum-webpack-config": "0.1.0-beta.10",
-    "jquery": "^3.4.1",
+    "jquery": "^3.5.1",
     "jquery.hotkeys": "^0.1.0",
     "lodash-es": "^4.17.14",
     "m.attrs.bidi": "github:tobscure/m.attrs.bidi",

js/src/admin/AdminApplication.js

@@ -1,13 +1,29 @@
 import HeaderPrimary from './components/HeaderPrimary';
 import HeaderSecondary from './components/HeaderSecondary';
 import routes from './routes';
+import ExtensionPage from './components/ExtensionPage';
 import Application from '../common/Application';
 import Navigation from '../common/components/Navigation';
 import AdminNav from './components/AdminNav';
+import ExtensionData from './utils/ExtensionData';
 
 export default class AdminApplication extends Application {
+  // Deprecated as of beta 15
   extensionSettings = {};
 
+  extensionData = new ExtensionData();
+
+  extensionCategories = {
+    discussion: 70,
+    moderation: 60,
+    feature: 50,
+    formatting: 40,
+    theme: 30,
+    authentication: 20,
+    language: 10,
+    other: 0,
+  };
+
   history = {
     canGoBack: () => true,
     getPrevious: () => {},
@@ -27,24 +43,29 @@ export default class AdminApplication extends Application {
    * @inheritdoc
    */
   mount() {
-    m.mount(document.getElementById('app-navigation'), { view: () => Navigation.component({ className: 'App-backControl', drawer: true }) });
-    m.mount(document.getElementById('header-navigation'), Navigation);
-    m.mount(document.getElementById('header-primary'), HeaderPrimary);
-    m.mount(document.getElementById('header-secondary'), HeaderSecondary);
-    m.mount(document.getElementById('admin-navigation'), AdminNav);
-
     // Mithril does not render the home route on https://example.com/admin, so
     // we need to go to https://example.com/admin#/ explicitly.
     if (!document.location.hash) document.location.hash = '#/';
 
     m.route.prefix = '#';
-
     super.mount();
 
+    m.mount(document.getElementById('app-navigation'), {
+      view: () =>
+        Navigation.component({
+          className: 'App-backControl',
+          drawer: true,
+        }),
+    });
+    m.mount(document.getElementById('header-navigation'), Navigation);
+    m.mount(document.getElementById('header-primary'), HeaderPrimary);
+    m.mount(document.getElementById('header-secondary'), HeaderSecondary);
+    m.mount(document.getElementById('admin-navigation'), AdminNav);
+
     // If an extension has just been enabled, then we will run its settings
     // callback.
     const enabled = localStorage.getItem('enabledExtension');
-    if (enabled && this.extensionSettings[enabled]) {
+    if (enabled && this.extensionSettings[enabled] && typeof this.extensionSettings[enabled] === 'function') {
       this.extensionSettings[enabled]();
       localStorage.removeItem('enabledExtension');
     }

js/src/admin/compat.js

@@ -1,19 +1,24 @@
 import compat from '../common/compat';
 
 import saveSettings from './utils/saveSettings';
+import ExtensionData from './utils/ExtensionData';
+import isExtensionEnabled from './utils/isExtensionEnabled';
+import getCategorizedExtensions from './utils/getCategorizedExtensions';
 import SettingDropdown from './components/SettingDropdown';
 import EditCustomFooterModal from './components/EditCustomFooterModal';
 import SessionDropdown from './components/SessionDropdown';
 import HeaderPrimary from './components/HeaderPrimary';
 import AppearancePage from './components/AppearancePage';
 import StatusWidget from './components/StatusWidget';
+import ExtensionsWidget from './components/ExtensionsWidget';
 import HeaderSecondary from './components/HeaderSecondary';
 import SettingsModal from './components/SettingsModal';
 import DashboardWidget from './components/DashboardWidget';
-import AddExtensionModal from './components/AddExtensionModal';
-import ExtensionsPage from './components/ExtensionsPage';
+import ExtensionPage from './components/ExtensionPage';
+import ExtensionLinkButton from './components/ExtensionLinkButton';
 import AdminLinkButton from './components/AdminLinkButton';
 import PermissionGrid from './components/PermissionGrid';
+import ExtensionPermissionGrid from './components/ExtensionPermissionGrid';
 import MailPage from './components/MailPage';
 import UploadImageButton from './components/UploadImageButton';
 import LoadingModal from './components/LoadingModal';
@@ -23,6 +28,7 @@ import EditCustomHeaderModal from './components/EditCustomHeaderModal';
 import PermissionsPage from './components/PermissionsPage';
 import PermissionDropdown from './components/PermissionDropdown';
 import AdminNav from './components/AdminNav';
+import AdminHeader from './components/AdminHeader';
 import EditCustomCssModal from './components/EditCustomCssModal';
 import EditGroupModal from './components/EditGroupModal';
 import routes from './routes';
@@ -30,19 +36,24 @@ import AdminApplication from './AdminApplication';
 
 export default Object.assign(compat, {
   'utils/saveSettings': saveSettings,
+  'utils/ExtensionData': ExtensionData,
+  'utils/isExtensionEnabled': isExtensionEnabled,
+  'utils/getCategorizedExtensions': getCategorizedExtensions,
   'components/SettingDropdown': SettingDropdown,
   'components/EditCustomFooterModal': EditCustomFooterModal,
   'components/SessionDropdown': SessionDropdown,
   'components/HeaderPrimary': HeaderPrimary,
   'components/AppearancePage': AppearancePage,
   'components/StatusWidget': StatusWidget,
+  'components/ExtensionsWidget': ExtensionsWidget,
   'components/HeaderSecondary': HeaderSecondary,
   'components/SettingsModal': SettingsModal,
   'components/DashboardWidget': DashboardWidget,
-  'components/AddExtensionModal': AddExtensionModal,
-  'components/ExtensionsPage': ExtensionsPage,
+  'components/ExtensionPage': ExtensionPage,
+  'components/ExtensionLinkButton': ExtensionLinkButton,
   'components/AdminLinkButton': AdminLinkButton,
   'components/PermissionGrid': PermissionGrid,
+  'components/ExtensionPermissionGrid': ExtensionPermissionGrid,
   'components/MailPage': MailPage,
   'components/UploadImageButton': UploadImageButton,
   'components/LoadingModal': LoadingModal,
@@ -52,6 +63,7 @@ export default Object.assign(compat, {
   'components/PermissionsPage': PermissionsPage,
   'components/PermissionDropdown': PermissionDropdown,
   'components/AdminNav': AdminNav,
+  'components/AdminHeader': AdminHeader,
   'components/EditCustomCssModal': EditCustomCssModal,
   'components/EditGroupModal': EditGroupModal,
   routes: routes,

js/src/admin/components/AdminHeader.js

@@ -0,0 +1,19 @@
+import Component from '../../common/Component';
+import classList from '../../common/utils/classList';
+import icon from '../../common/helpers/icon';
+
+export default class AdminHeader extends Component {
+  view(vnode) {
+    return [
+      <div className={classList(['AdminHeader', this.attrs.className])}>
+        <div className="container">
+          <h2>
+            {icon(this.attrs.icon)}
+            {vnode.children}
+          </h2>
+          <div className="AdminHeader-description">{this.attrs.description}</div>
+        </div>
+      </div>,
+    ];
+  }
+}

js/src/admin/components/AdminNav.js

@@ -1,106 +1,150 @@
-/*
- * This file is part of Flarum.
- *
- * (c) Toby Zerner <toby.zerner@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
+import ExtensionLinkButton from './ExtensionLinkButton';
 import Component from '../../common/Component';
-import AdminLinkButton from './AdminLinkButton';
+import LinkButton from '../../common/components/LinkButton';
 import SelectDropdown from '../../common/components/SelectDropdown';
+import getCategorizedExtensions from '../utils/getCategorizedExtensions';
 import ItemList from '../../common/utils/ItemList';
+import Stream from '../../common/utils/Stream';
 
 export default class AdminNav extends Component {
+  oninit(vnode) {
+    super.oninit(vnode);
+
+    this.query = Stream('');
+  }
+
   view() {
     return (
-      <SelectDropdown className="AdminNav App-titleControl" buttonClassName="Button">
-        {this.items().toArray()}
+      <SelectDropdown className="AdminNav App-titleControl AdminNav-Main" buttonClassName="Button">
+        {this.items().toArray().concat(this.extensionItems().toArray())}
       </SelectDropdown>
     );
   }
 
+  oncreate(vnode) {
+    super.oncreate(vnode);
+
+    this.scrollToActive();
+  }
+
+  onupdate() {
+    this.scrollToActive();
+  }
+
+  scrollToActive() {
+    const children = $('.Dropdown-menu').children('.active');
+    const nav = $('#admin-navigation');
+    const time = app.previous.type ? 250 : 0;
+
+    if (
+      children.length > 0 &&
+      (children[0].offsetTop > nav.scrollTop() + nav.outerHeight() || children[0].offsetTop + children[0].offsetHeight < nav.scrollTop())
+    ) {
+      nav.animate(
+        {
+          scrollTop: children[0].offsetTop - nav.height() / 2,
+        },
+        time
+      );
+    }
+  }
+
   /**
-   * Build an item list of links to show in the admin navigation.
+   * Build an item list of main links to show in the admin navigation.
    *
    * @return {ItemList}
    */
   items() {
     const items = new ItemList();
 
+    items.add('category-core', <h4 className="ExtensionListTitle">{app.translator.trans('core.admin.nav.categories.core')}</h4>);
+
     items.add(
       'dashboard',
-      AdminLinkButton.component(
-        {
-          href: app.route('dashboard'),
-          icon: 'far fa-chart-bar',
-          description: app.translator.trans('core.admin.nav.dashboard_text'),
-        },
-        app.translator.trans('core.admin.nav.dashboard_button')
-      )
+      <LinkButton href={app.route('dashboard')} icon="far fa-chart-bar" title={app.translator.trans('core.admin.nav.dashboard_title')}>
+        {app.translator.trans('core.admin.nav.dashboard_button')}
+      </LinkButton>
     );
 
     items.add(
       'basics',
-      AdminLinkButton.component(
-        {
-          href: app.route('basics'),
-          icon: 'fas fa-pencil-alt',
-          description: app.translator.trans('core.admin.nav.basics_text'),
-        },
-        app.translator.trans('core.admin.nav.basics_button')
-      )
+      <LinkButton href={app.route('basics')} icon="fas fa-pencil-alt" title={app.translator.trans('core.admin.nav.basics_title')}>
+        {app.translator.trans('core.admin.nav.basics_button')}
+      </LinkButton>
     );
 
     items.add(
       'mail',
-      AdminLinkButton.component(
-        {
-          href: app.route('mail'),
-          icon: 'fas fa-envelope',
-          description: app.translator.trans('core.admin.nav.email_text'),
-        },
-        app.translator.trans('core.admin.nav.email_button')
-      )
+      <LinkButton href={app.route('mail')} icon="fas fa-envelope" title={app.translator.trans('core.admin.nav.email_title')}>
+        {app.translator.trans('core.admin.nav.email_button')}
+      </LinkButton>
     );
 
     items.add(
       'permissions',
-      AdminLinkButton.component(
-        {
-          href: app.route('permissions'),
-          icon: 'fas fa-key',
-          description: app.translator.trans('core.admin.nav.permissions_text'),
-        },
-        app.translator.trans('core.admin.nav.permissions_button')
-      )
+      <LinkButton href={app.route('permissions')} icon="fas fa-key" title={app.translator.trans('core.admin.nav.permissions_title')}>
+        {app.translator.trans('core.admin.nav.permissions_button')}
+      </LinkButton>
     );
 
     items.add(
       'appearance',
-      AdminLinkButton.component(
-        {
-          href: app.route('appearance'),
-          icon: 'fas fa-paint-brush',
-          description: app.translator.trans('core.admin.nav.appearance_text'),
-        },
-        app.translator.trans('core.admin.nav.appearance_button')
-      )
+      <LinkButton href={app.route('appearance')} icon="fas fa-paint-brush" title={app.translator.trans('core.admin.nav.appearance_title')}>
+        {app.translator.trans('core.admin.nav.appearance_button')}
+      </LinkButton>
     );
 
     items.add(
-      'extensions',
-      AdminLinkButton.component(
-        {
-          href: app.route('extensions'),
-          icon: 'fas fa-puzzle-piece',
-          description: app.translator.trans('core.admin.nav.extensions_text'),
-        },
-        app.translator.trans('core.admin.nav.extensions_button')
-      )
+      'search',
+      <div className="Search-input">
+        <input
+          className="FormControl SearchBar"
+          bidi={this.query}
+          type="search"
+          placeholder={app.translator.trans('core.admin.nav.search_placeholder')}
+        />
+      </div>
     );
 
     return items;
   }
+
+  extensionItems() {
+    const items = new ItemList();
+
+    const categorizedExtensions = getCategorizedExtensions();
+    const categories = app.extensionCategories;
+
+    Object.keys(categorizedExtensions).map((category) => {
+      if (!this.query()) {
+        items.add(
+          `category-${category}`,
+          <h4 className="ExtensionListTitle">{app.translator.trans(`core.admin.nav.categories.${category}`)}</h4>,
+          categories[category]
+        );
+      }
+
+      categorizedExtensions[category].map((extension) => {
+        const query = this.query().toUpperCase();
+        const title = extension.extra['flarum-extension'].title;
+
+        if (!query || title.toUpperCase().includes(query) || extension.description.toUpperCase().includes(query)) {
+          items.add(
+            `extension-${extension.id}`,
+            <ExtensionLinkButton
+              href={app.route('extension', { id: extension.id })}
+              extensionId={extension.id}
+              className="ExtensionNavButton"
+              title={extension.description}
+            >
+              {title}
+            </ExtensionLinkButton>,
+            categories[category]
+          );
+        }
+      });
+    });
+
+    return items;
+  }
 }

js/src/admin/components/AppearancePage.js

@@ -7,6 +7,7 @@ import EditCustomHeaderModal from './EditCustomHeaderModal';
 import EditCustomFooterModal from './EditCustomFooterModal';
 import UploadImageButton from './UploadImageButton';
 import saveSettings from '../utils/saveSettings';
+import AdminHeader from './AdminHeader';
 
 export default class AppearancePage extends Page {
   oninit(vnode) {
@@ -21,6 +22,13 @@ export default class AppearancePage extends Page {
   view() {
     return (
       <div className="AppearancePage">
+        <AdminHeader
+          icon="fas fa-paint-brush"
+          description={app.translator.trans('core.admin.appearance.description')}
+          className="AppearancePage-header"
+        >
+          {app.translator.trans('core.admin.appearance.title')}
+        </AdminHeader>
         <div className="container">
           <form onsubmit={this.onsubmit.bind(this)}>
             <fieldset className="AppearancePage-colors">

js/src/admin/components/BasicsPage.js

@@ -7,6 +7,7 @@ import ItemList from '../../common/utils/ItemList';
 import Switch from '../../common/components/Switch';
 import Stream from '../../common/utils/Stream';
 import withAttr from '../../common/utils/withAttr';
+import AdminHeader from './AdminHeader';
 
 export default class BasicsPage extends Page {
   oninit(vnode) {
@@ -24,10 +25,6 @@ export default class BasicsPage extends Page {
       'welcome_message',
       'display_name_driver',
     ];
-    this.values = {};
-
-    const settings = app.data.settings;
-    this.fields.forEach((key) => (this.values[key] = Stream(settings[key])));
 
     this.localeOptions = {};
     const locales = app.data.locales;
@@ -41,14 +38,38 @@ export default class BasicsPage extends Page {
       this.displayNameOptions[identifier] = identifier;
     }, this);
 
+    this.slugDriverOptions = {};
+    Object.keys(app.data.slugDrivers).forEach((model) => {
+      this.fields.push(`slug_driver_${model}`);
+      this.slugDriverOptions[model] = {};
+
+      app.data.slugDrivers[model].forEach((option) => {
+        this.slugDriverOptions[model][option] = option;
+      });
+    });
+
+    this.values = {};
+
+    const settings = app.data.settings;
+    this.fields.forEach((key) => (this.values[key] = Stream(settings[key])));
+
     if (!this.values.display_name_driver() && displayNameDrivers.includes('username')) this.values.display_name_driver('username');
 
+    Object.keys(app.data.slugDrivers).forEach((model) => {
+      if (!this.values[`slug_driver_${model}`]() && 'default' in this.slugDriverOptions[model]) {
+        this.values[`slug_driver_${model}`]('default');
+      }
+    });
+
     if (typeof this.values.show_language_selector() !== 'number') this.values.show_language_selector(1);
   }
 
   view() {
     return (
       <div className="BasicsPage">
+        <AdminHeader icon="fas fa-pencil-alt" description={app.translator.trans('core.admin.basics.description')} className="BasicsPage-header">
+          {app.translator.trans('core.admin.basics.title')}
+        </AdminHeader>
         <div className="container">
           <form onsubmit={this.onsubmit.bind(this)}>
             {FieldSet.component(
@@ -128,20 +149,30 @@ export default class BasicsPage extends Page {
               ]
             )}
 
-            {Object.keys(this.displayNameOptions).length > 1
-              ? FieldSet.component(
-                  {
-                    label: app.translator.trans('core.admin.basics.display_name_heading'),
-                  },
-                  [
-                    <div className="helpText">{app.translator.trans('core.admin.basics.display_name_text')}</div>,
-                    Select.component({
-                      options: this.displayNameOptions,
-                      bidi: this.values.display_name_driver,
-                    }),
-                  ]
-                )
-              : ''}
+            {Object.keys(this.displayNameOptions).length > 1 ? (
+              <FieldSet label={app.translator.trans('core.admin.basics.display_name_heading')}>
+                <div className="helpText">{app.translator.trans('core.admin.basics.display_name_text')}</div>
+                <Select
+                  options={this.displayNameOptions}
+                  value={this.values.display_name_driver()}
+                  onchange={this.values.display_name_driver}
+                ></Select>
+              </FieldSet>
+            ) : (
+              ''
+            )}
+
+            {Object.keys(this.slugDriverOptions).map((model) => {
+              const options = this.slugDriverOptions[model];
+              if (Object.keys(options).length > 1) {
+                return (
+                  <FieldSet label={app.translator.trans('core.admin.basics.slug_driver_heading', { model })}>
+                    <div className="helpText">{app.translator.trans('core.admin.basics.slug_driver_text', { model })}</div>
+                    <Select options={options} value={this.values[`slug_driver_${model}`]()} onchange={this.values[`slug_driver_${model}`]}></Select>
+                  </FieldSet>
+                );
+              }
+            })}
 
             {Button.component(
               {

js/src/admin/components/DashboardPage.js

@@ -1,16 +1,29 @@
 import Page from '../../common/components/Page';
 import StatusWidget from './StatusWidget';
+import ExtensionsWidget from './ExtensionsWidget';
+import AdminHeader from './AdminHeader';
+import ItemList from '../../common/utils/ItemList';
+import listItems from '../../common/helpers/listItems';
 
 export default class DashboardPage extends Page {
   view() {
     return (
       <div className="DashboardPage">
-        <div className="container">{this.availableWidgets()}</div>
+        <AdminHeader icon="fas fa-chart-bar" description={app.translator.trans('core.admin.dashboard.description')} className="DashboardPage-header">
+          {app.translator.trans('core.admin.dashboard.title')}
+        </AdminHeader>
+        <div className="container">{this.availableWidgets().toArray()}</div>
       </div>
     );
   }
 
   availableWidgets() {
-    return [<StatusWidget />];
+    const items = new ItemList();
+
+    items.add('status', <StatusWidget />, 30);
+
+    items.add('extensions', <ExtensionsWidget />, 10);
+
+    return items;
   }
 }

js/src/admin/components/ExtensionLinkButton.js

@@ -0,0 +1,29 @@
+import isExtensionEnabled from '../utils/isExtensionEnabled';
+import LinkButton from '../../common/components/LinkButton';
+import icon from '../../common/helpers/icon';
+import ItemList from '../../common/utils/ItemList';
+
+export default class ExtensionLinkButton extends LinkButton {
+  getButtonContent(children) {
+    const content = super.getButtonContent(children);
+    const extension = app.data.extensions[this.attrs.extensionId];
+    const statuses = this.statusItems(extension.id).toArray();
+
+    content.unshift(
+      <span className="ExtensionListItem-icon ExtensionIcon" style={extension.icon}>
+        {extension.icon ? icon(extension.icon.name) : ''}
+      </span>
+    );
+    content.push(statuses);
+
+    return content;
+  }
+
+  statusItems(name) {
+    const items = new ItemList();
+
+    items.add('enabled', <span class={'ExtensionListItem-Dot ' + (isExtensionEnabled(name) ? 'enabled' : 'disabled')} />);
+
+    return items;
+  }
+}

js/src/admin/components/ExtensionPage.js

@@ -0,0 +1,363 @@
+import Button from '../../common/components/Button';
+import Link from '../../common/components/Link';
+import LinkButton from '../../common/components/LinkButton';
+import Page from '../../common/components/Page';
+import Select from '../../common/components/Select';
+import Switch from '../../common/components/Switch';
+import icon from '../../common/helpers/icon';
+import punctuateSeries from '../../common/helpers/punctuateSeries';
+import listItems from '../../common/helpers/listItems';
+import ItemList from '../../common/utils/ItemList';
+import Stream from '../../common/utils/Stream';
+import LoadingModal from './LoadingModal';
+import ExtensionPermissionGrid from './ExtensionPermissionGrid';
+import saveSettings from '../utils/saveSettings';
+import isExtensionEnabled from '../utils/isExtensionEnabled';
+
+export default class ExtensionPage extends Page {
+  oninit(vnode) {
+    super.oninit(vnode);
+
+    this.loading = false;
+    this.extension = app.data.extensions[this.attrs.id];
+    this.changingState = false;
+    this.settings = {};
+
+    this.infoFields = {
+      discuss: 'fas fa-comment-alt',
+      documentation: 'fas fa-book',
+      support: 'fas fa-life-ring',
+      website: 'fas fa-link',
+      donate: 'fas fa-donate',
+      source: 'fas fa-code',
+    };
+
+    // Backwards compatibility layer will be removed in
+    // Beta 16
+    if (app.extensionSettings[this.extension.id]) {
+      app.extensionData[this.extension.id] = app.extensionSettings[this.extension.id];
+    }
+  }
+
+  className() {
+    return this.extension.id + '-Page';
+  }
+
+  view() {
+    return (
+      <div className={'ExtensionPage ' + this.className()}>
+        {this.header()}
+        {!this.isEnabled() ? (
+          <div className="container">
+            <h3 className="ExtensionPage-subHeader">{app.translator.trans('core.admin.extension.enable_to_see')}</h3>
+          </div>
+        ) : (
+          <div className="ExtensionPage-body">{this.sections().toArray()}</div>
+        )}
+      </div>
+    );
+  }
+
+  header() {
+    return [
+      <div className="ExtensionPage-header">
+        <div className="container">
+          <div className="ExtensionTitle">
+            <span className="ExtensionIcon" style={this.extension.icon}>
+              {this.extension.icon ? icon(this.extension.icon.name) : ''}
+            </span>
+            <div className="ExtensionName">
+              <h2>{this.extension.extra['flarum-extension'].title}</h2>
+            </div>
+            <div className="ExtensionPage-headerTopItems">
+              <ul>{listItems(this.topItems().toArray())}</ul>
+            </div>
+          </div>
+          <div className="helpText">{this.extension.description}</div>
+          <div className="ExtensionPage-headerItems">
+            <Switch state={this.isEnabled()} onchange={this.toggle.bind(this, this.extension.id)}>
+              {this.isEnabled(this.extension.id)
+                ? app.translator.trans('core.admin.extension.enabled')
+                : app.translator.trans('core.admin.extension.disabled')}
+            </Switch>
+            <aside className="ExtensionInfo">
+              <ul>{listItems(this.infoItems().toArray())}</ul>
+            </aside>
+          </div>
+        </div>
+      </div>,
+    ];
+  }
+
+  sections() {
+    const items = new ItemList();
+
+    items.add('content', this.content());
+
+    items.add('permissions', [
+      <div className="ExtensionPage-permissions">
+        <div className="ExtensionPage-permissions-header">
+          <div className="container">
+            <h2 className="ExtensionTitle">{app.translator.trans('core.admin.extension.permissions_title')}</h2>
+          </div>
+        </div>
+        <div className="container">
+          {app.extensionData.extensionHasPermissions(this.extension.id) ? (
+            ExtensionPermissionGrid.component({ extensionId: this.extension.id })
+          ) : (
+            <h3 className="ExtensionPage-subHeader">{app.translator.trans('core.admin.extension.no_permissions')}</h3>
+          )}
+        </div>
+      </div>,
+    ]);
+
+    return items;
+  }
+
+  content() {
+    const settings = app.extensionData.getSettings(this.extension.id);
+
+    return (
+      <div className="ExtensionPage-settings">
+        <div className="container">
+          {typeof app.extensionData[this.extension.id] === 'function' ? (
+            <Button onclick={app.extensionData[this.extension.id].bind(this)} className="Button Button--primary">
+              {app.translator.trans('core.admin.extension.open_modal')}
+            </Button>
+          ) : settings ? (
+            <div className="Form">
+              {settings.map(this.buildSettingComponent.bind(this))}
+              <div className="Form-group">{this.submitButton()}</div>
+            </div>
+          ) : (
+            <h3 className="ExtensionPage-subHeader">{app.translator.trans('core.admin.extension.no_settings')}</h3>
+          )}
+        </div>
+      </div>
+    );
+  }
+
+  topItems() {
+    const items = new ItemList();
+
+    items.add('version', <span className="ExtensionVersion">{this.extension.version}</span>);
+
+    if (!this.isEnabled()) {
+      const uninstall = () => {
+        if (confirm(app.translator.trans('core.admin.extension.confirm_uninstall'))) {
+          app
+            .request({
+              url: app.forum.attribute('apiUrl') + '/extensions/' + this.extension.id,
+              method: 'DELETE',
+            })
+            .then(() => window.location.reload());
+
+          app.modal.show(LoadingModal);
+        }
+      };
+
+      items.add(
+        'uninstall',
+        <Button icon="fas fa-trash-alt" className="Button Button--primary" onclick={uninstall.bind(this)}>
+          {app.translator.trans('core.admin.extension.uninstall_button')}
+        </Button>
+      );
+    }
+
+    return items;
+  }
+
+  infoItems() {
+    const items = new ItemList();
+
+    const links = this.extension.links;
+
+    if (links.authors.length) {
+      let authors = [];
+
+      links.authors.map((author) => {
+        authors.push(
+          <Link href={author.link} external={true} target="_blank">
+            {author.name}
+          </Link>
+        );
+      });
+
+      items.add('authors', [icon('fas fa-user'), <span>{punctuateSeries(authors)}</span>]);
+    }
+
+    Object.keys(this.infoFields).map((field) => {
+      if (links[field]) {
+        items.add(
+          field,
+          <LinkButton href={links[field]} icon={this.infoFields[field]} external={true} target="_blank">
+            {app.translator.trans(`core.admin.extension.info_links.${field}`)}
+          </LinkButton>
+        );
+      }
+    });
+
+    return items;
+  }
+
+  submitButton() {
+    return (
+      <Button onclick={this.saveSettings.bind(this)} className="Button Button--primary" loading={this.loading} disabled={!this.isChanged()}>
+        {app.translator.trans('core.admin.settings.submit_button')}
+      </Button>
+    );
+  }
+
+  /**
+   * getSetting takes a settings object and turns it into a component.
+   * Depending on the type of input, you can set the type to 'bool', 'select', or
+   * any standard <input> type.
+   *
+   * Alternatively, you can pass a callback that will be executed in ExtensionPage's
+   * context to include custom JSX elements.
+   *
+   * @example
+   *
+   * {
+   *    setting: 'acme.checkbox',
+   *    label: app.translator.trans('acme.admin.setting_label'),
+   *    type: 'bool'
+   * }
+   *
+   * @example
+   *
+   * {
+   *    setting: 'acme.select',
+   *    label: app.translator.trans('acme.admin.setting_label'),
+   *    type: 'select',
+   *    options: {
+   *      'option1': 'Option 1 label',
+   *      'option2': 'Option 2 label',
+   *    },
+   *    default: 'option1',
+   * }
+   *
+   * @param setting
+   * @returns {JSX.Element}
+   */
+  buildSettingComponent(entry) {
+    if (typeof entry === 'function') {
+      return entry.call(this);
+    }
+
+    const setting = entry.setting;
+    const value = this.setting([setting])();
+    if (['bool', 'checkbox', 'switch', 'boolean'].includes(entry.type)) {
+      return (
+        <div className="Form-group">
+          <Switch state={!!value && value !== '0'} onchange={this.settings[setting]}>
+            {entry.label}
+          </Switch>
+        </div>
+      );
+    } else if (['select', 'dropdown', 'selectdropdown'].includes(entry.type)) {
+      return (
+        <div className="Form-group">
+          <label>{entry.label}</label>
+          <Select value={value || entry.default} options={entry.options} buttonClassName="Button" onchange={this.settings[setting]} />
+        </div>
+      );
+    } else {
+      return (
+        <div className="Form-group">
+          <label>{entry.label}</label>
+          <input type={entry.type} className="FormControl" bidi={this.setting(setting)} />
+        </div>
+      );
+    }
+  }
+
+  toggle() {
+    const enabled = this.isEnabled();
+
+    this.changingState = true;
+
+    app
+      .request({
+        url: app.forum.attribute('apiUrl') + '/extensions/' + this.extension.id,
+        method: 'PATCH',
+        body: { enabled: !enabled },
+        errorHandler: this.onerror.bind(this),
+      })
+      .then(() => {
+        if (!enabled) localStorage.setItem('enabledExtension', this.extension.id);
+        window.location.reload();
+      });
+
+    app.modal.show(LoadingModal);
+  }
+
+  dirty() {
+    const dirty = {};
+
+    Object.keys(this.settings).forEach((key) => {
+      const value = this.settings[key]();
+
+      if (value !== app.data.settings[key]) {
+        dirty[key] = value;
+      }
+    });
+
+    return dirty;
+  }
+
+  isChanged() {
+    return Object.keys(this.dirty()).length;
+  }
+
+  saveSettings(e) {
+    e.preventDefault();
+
+    app.alerts.clear();
+
+    this.loading = true;
+
+    saveSettings(this.dirty()).then(this.onsaved.bind(this));
+  }
+
+  onsaved() {
+    this.loading = false;
+
+    app.alerts.show({ type: 'success' }, app.translator.trans('core.admin.extension.saved_message'));
+  }
+
+  setting(key, fallback = '') {
+    this.settings[key] = this.settings[key] || Stream(app.data.settings[key] || fallback);
+
+    return this.settings[key];
+  }
+
+  isEnabled() {
+    let isEnabled = isExtensionEnabled(this.extension.id);
+
+    return this.changingState ? !isEnabled : isEnabled;
+  }
+
+  onerror(e) {
+    // We need to give the modal animation time to start; if we close the modal too early,
+    // it breaks the bootstrap modal library.
+    // TODO: This workaround should be removed when we move away from bootstrap JS for modals.
+    setTimeout(() => {
+      app.modal.close();
+    }, 300); // Bootstrap's Modal.TRANSITION_DURATION is 300 ms.
+
+    if (e.status !== 409) {
+      throw e;
+    }
+
+    const error = e.response.errors[0];
+
+    app.alerts.show(
+      { type: 'error' },
+      app.translator.trans(`core.lib.error.${error.code}_message`, {
+        extension: error.extension,
+        extensions: error.extensions.join(', '),
+      })
+    );
+  }
+}

js/src/admin/components/ExtensionPermissionGrid.js

@@ -0,0 +1,39 @@
+import PermissionGrid from './PermissionGrid';
+import ItemList from '../../common/utils/ItemList';
+
+export default class ExtensionPermissionGrid extends PermissionGrid {
+  oninit(vnode) {
+    super.oninit(vnode);
+
+    this.extensionId = this.attrs.extensionId;
+  }
+
+  permissionItems() {
+    const permissionCategories = super.permissionItems();
+
+    permissionCategories.items = Object.entries(permissionCategories.items)
+      .filter(([category, info]) => info.content.children.length > 0)
+      .reduce((obj, [category, info]) => {
+        obj[category] = info;
+        return obj;
+      }, {});
+
+    return permissionCategories;
+  }
+
+  viewItems() {
+    return app.extensionData.getExtensionPermissions(this.extensionId, 'view') || new ItemList();
+  }
+
+  startItems() {
+    return app.extensionData.getExtensionPermissions(this.extensionId, 'start') || new ItemList();
+  }
+
+  replyItems() {
+    return app.extensionData.getExtensionPermissions(this.extensionId, 'reply') || new ItemList();
+  }
+
+  moderateItems() {
+    return app.extensionData.getExtensionPermissions(this.extensionId, 'moderate') || new ItemList();
+  }
+}

js/src/admin/components/ExtensionsPage.js

@@ -1,154 +0,0 @@
-import Page from '../../common/components/Page';
-import Button from '../../common/components/Button';
-import Dropdown from '../../common/components/Dropdown';
-import AddExtensionModal from './AddExtensionModal';
-import LoadingModal from './LoadingModal';
-import ItemList from '../../common/utils/ItemList';
-import icon from '../../common/helpers/icon';
-
-export default class ExtensionsPage extends Page {
-  view() {
-    return (
-      <div className="ExtensionsPage">
-        <div className="ExtensionsPage-header">
-          <div className="container">
-            {Button.component(
-              {
-                icon: 'fas fa-plus',
-                className: 'Button Button--primary',
-                onclick: () => app.modal.show(AddExtensionModal),
-              },
-              app.translator.trans('core.admin.extensions.add_button')
-            )}
-          </div>
-        </div>
-
-        <div className="ExtensionsPage-list">
-          <div className="container">
-            <ul className="ExtensionList">
-              {Object.keys(app.data.extensions).map((id) => {
-                const extension = app.data.extensions[id];
-                const controls = this.controlItems(extension.id).toArray();
-
-                return (
-                  <li className={'ExtensionListItem ' + (!this.isEnabled(extension.id) ? 'disabled' : '')}>
-                    <div className="ExtensionListItem-content">
-                      <span className="ExtensionListItem-icon ExtensionIcon" style={extension.icon}>
-                        {extension.icon ? icon(extension.icon.name) : ''}
-                      </span>
-                      {controls.length ? (
-                        <Dropdown
-                          className="ExtensionListItem-controls"
-                          buttonClassName="Button Button--icon Button--flat"
-                          menuClassName="Dropdown-menu--right"
-                          icon="fas fa-ellipsis-h"
-                        >
-                          {controls}
-                        </Dropdown>
-                      ) : (
-                        ''
-                      )}
-                      <div className="ExtensionListItem-main">
-                        <label className="ExtensionListItem-title">
-                          <input type="checkbox" checked={this.isEnabled(extension.id)} onclick={this.toggle.bind(this, extension.id)} />{' '}
-                          {extension.extra['flarum-extension'].title}
-                        </label>
-                        <div className="ExtensionListItem-version">{extension.version}</div>
-                        <div className="ExtensionListItem-description">{extension.description}</div>
-                      </div>
-                    </div>
-                  </li>
-                );
-              })}
-            </ul>
-          </div>
-        </div>
-      </div>
-    );
-  }
-
-  controlItems(name) {
-    const items = new ItemList();
-    const enabled = this.isEnabled(name);
-
-    if (app.extensionSettings[name]) {
-      items.add(
-        'settings',
-        Button.component(
-          {
-            icon: 'fas fa-cog',
-            onclick: app.extensionSettings[name],
-          },
-          app.translator.trans('core.admin.extensions.settings_button')
-        )
-      );
-    }
-
-    if (!enabled) {
-      items.add(
-        'uninstall',
-        Button.component(
-          {
-            icon: 'far fa-trash-alt',
-            onclick: () => {
-              app
-                .request({
-                  url: app.forum.attribute('apiUrl') + '/extensions/' + name,
-                  method: 'DELETE',
-                })
-                .then(() => window.location.reload());
-
-              app.modal.show(LoadingModal);
-            },
-          },
-          app.translator.trans('core.admin.extensions.uninstall_button')
-        )
-      );
-    }
-
-    return items;
-  }
-
-  isEnabled(name) {
-    const enabled = JSON.parse(app.data.settings.extensions_enabled);
-
-    return enabled.indexOf(name) !== -1;
-  }
-
-  toggle(id) {
-    const enabled = this.isEnabled(id);
-
-    app
-      .request({
-        url: app.forum.attribute('apiUrl') + '/extensions/' + id,
-        method: 'PATCH',
-        body: { enabled: !enabled },
-        errorHandler: this.onerror.bind(this),
-      })
-      .then(() => {
-        if (!enabled) localStorage.setItem('enabledExtension', id);
-        window.location.reload();
-      });
-
-    app.modal.show(LoadingModal);
-  }
-
-  onerror(e) {
-    // We need to give the modal animation time to start; if we close the modal too early,
-    // it breaks the bootstrap modal library.
-    // TODO: This workaround should be removed when we move away from bootstrap JS for modals.
-    setTimeout(() => {
-      app.modal.close();
-
-      const error = JSON.parse(e.responseText).errors[0];
-
-      app.alerts.show(
-        { type: 'error' },
-        app.translator.trans(`core.lib.error.${error.code}_message`, {
-          extension: error.extension,
-          extensions: error.extensions.join(', '),
-        })
-      );
-    }, 250);
-  }
-}

js/src/admin/components/ExtensionsWidget.js

@@ -0,0 +1,46 @@
+import DashboardWidget from './DashboardWidget';
+import isExtensionEnabled from '../utils/isExtensionEnabled';
+import getCategorizedExtensions from '../utils/getCategorizedExtensions';
+import Link from '../../common/components/Link';
+import icon from '../../common/helpers/icon';
+
+export default class ExtensionsWidget extends DashboardWidget {
+  className() {
+    return 'ExtensionsWidget';
+  }
+
+  content() {
+    const categorizedExtensions = getCategorizedExtensions();
+    const categories = app.extensionCategories;
+
+    return (
+      <div className="ExtensionsWidget-list">
+        {Object.keys(categories).map((category) => {
+          if (categorizedExtensions[category]) {
+            return (
+              <div className="ExtensionList-Category">
+                <h4 className="ExtensionList-Label">{app.translator.trans(`core.admin.nav.categories.${category}`)}</h4>
+                <ul className="ExtensionList">
+                  {categorizedExtensions[category].map((extension) => {
+                    return (
+                      <li className={'ExtensionListItem ' + (!isExtensionEnabled(extension.id) ? 'disabled' : '')}>
+                        <Link href={app.route('extension', { id: extension.id })}>
+                          <div className="ExtensionListItem-content">
+                            <span className="ExtensionListItem-icon ExtensionIcon" style={extension.icon}>
+                              {extension.icon ? icon(extension.icon.name) : ''}
+                            </span>
+                            <span className="ExtensionListItem-title">{extension.extra['flarum-extension'].title}</span>
+                          </div>
+                        </Link>
+                      </li>
+                    );
+                  })}
+                </ul>
+              </div>
+            );
+          }
+        })}
+      </div>
+    );
+  }
+}

js/src/admin/components/HeaderSecondary.js

@@ -1,4 +1,5 @@
 import Component from '../../common/Component';
+import LinkButton from '../../common/components/LinkButton';
 import SessionDropdown from './SessionDropdown';
 import ItemList from '../../common/utils/ItemList';
 import listItems from '../../common/helpers/listItems';
@@ -19,6 +20,13 @@ export default class HeaderSecondary extends Component {
   items() {
     const items = new ItemList();
 
+    items.add(
+      'help',
+      <LinkButton href="https://docs.flarum.org/troubleshoot.html" icon="fas fa-question-circle" external={true} target="_blank">
+        {app.translator.trans('core.admin.header.get_help')}
+      </LinkButton>
+    );
+
     items.add('session', SessionDropdown.component());
 
     return items;

js/src/admin/components/MailPage.js

@@ -6,6 +6,8 @@ import Select from '../../common/components/Select';
 import LoadingIndicator from '../../common/components/LoadingIndicator';
 import saveSettings from '../utils/saveSettings';
 import Stream from '../../common/utils/Stream';
+import icon from '../../common/helpers/icon';
+import AdminHeader from './AdminHeader';
 
 export default class MailPage extends Page {
   oninit(vnode) {
@@ -65,11 +67,11 @@ export default class MailPage extends Page {
 
     return (
       <div className="MailPage">
+        <AdminHeader icon="fas fa-envelope" description={app.translator.trans('core.admin.email.description')} className="MailPage-header">
+          {app.translator.trans('core.admin.email.title')}
+        </AdminHeader>
         <div className="container">
           <form onsubmit={this.onsubmit.bind(this)}>
-            <h2>{app.translator.trans('core.admin.email.heading')}</h2>
-            <div className="helpText">{app.translator.trans('core.admin.email.text')}</div>
-
             {FieldSet.component(
               {
                 label: app.translator.trans('core.admin.email.addresses_heading'),

js/src/admin/components/PermissionGrid.js

@@ -6,12 +6,6 @@ import ItemList from '../../common/utils/ItemList';
 import icon from '../../common/helpers/icon';
 
 export default class PermissionGrid extends Component {
-  oninit(vnode) {
-    super.oninit(vnode);
-
-    this.permissions = this.permissionItems().toArray();
-  }
-
   view() {
     const scopes = this.scopeItems().toArray();
 
@@ -35,25 +29,27 @@ export default class PermissionGrid extends Component {
             <th>{this.scopeControlItems().toArray()}</th>
           </tr>
         </thead>
-        {this.permissions.map((section) => (
-          <tbody>
-            <tr className="PermissionGrid-section">
-              <th>{section.label}</th>
-              {permissionCells(section)}
-              <td />
-            </tr>
-            {section.children.map((child) => (
-              <tr className="PermissionGrid-child">
-                <th>
-                  {icon(child.icon)}
-                  {child.label}
-                </th>
-                {permissionCells(child)}
+        {this.permissionItems()
+          .toArray()
+          .map((section) => (
+            <tbody>
+              <tr className="PermissionGrid-section">
+                <th>{section.label}</th>
+                {permissionCells(section)}
                 <td />
               </tr>
-            ))}
-          </tbody>
-        ))}
+              {section.children.map((child) => (
+                <tr className="PermissionGrid-child">
+                  <th>
+                    {icon(child.icon)}
+                    {child.label}
+                  </th>
+                  {permissionCells(child)}
+                  <td />
+                </tr>
+              ))}
+            </tbody>
+          ))}
       </table>
     );
   }
@@ -158,6 +154,8 @@ export default class PermissionGrid extends Component {
       permission: 'user.viewLastSeenAt',
     });
 
+    items.merge(app.extensionData.getAllExtensionPermissions('view'));
+
     return items;
   }
 
@@ -198,6 +196,8 @@ export default class PermissionGrid extends Component {
       90
     );
 
+    items.merge(app.extensionData.getAllExtensionPermissions('start'));
+
     return items;
   }
 
@@ -238,6 +238,8 @@ export default class PermissionGrid extends Component {
       90
     );
 
+    items.merge(app.extensionData.getAllExtensionPermissions('reply'));
+
     return items;
   }
 
@@ -334,6 +336,8 @@ export default class PermissionGrid extends Component {
       60
     );
 
+    items.merge(app.extensionData.getAllExtensionPermissions('moderate'));
+
     return items;
   }
 

js/src/admin/components/PermissionsPage.js

@@ -4,11 +4,15 @@ import EditGroupModal from './EditGroupModal';
 import Group from '../../common/models/Group';
 import icon from '../../common/helpers/icon';
 import PermissionGrid from './PermissionGrid';
+import AdminHeader from './AdminHeader';
 
 export default class PermissionsPage extends Page {
   view() {
     return (
       <div className="PermissionsPage">
+        <AdminHeader icon="fas fa-key" description={app.translator.trans('core.admin.permissions.description')} className="PermissionsPage-header">
+          {app.translator.trans('core.admin.permissions.title')}
+        </AdminHeader>
         <div className="PermissionsPage-groups">
           <div className="container">
             {app.store

js/src/admin/index.js

@@ -10,8 +10,9 @@ export { app };
 // Export public API
 
 // Export compat API
-import compat from './compat';
+import compatObj from './compat';
+import proxifyCompat from '../common/utils/proxifyCompat';
 
-compat.app = app;
+compatObj.app = app;
 
-export { compat };
+export const compat = proxifyCompat(compatObj, 'admin');

js/src/admin/resolvers/ExtensionPageResolver.ts

@@ -0,0 +1,19 @@
+import DefaultResolver from '../../common/resolvers/DefaultResolver';
+
+/**
+ * A custom route resolver for ExtensionPage that generates handles routes
+ * to default extension pages or a page provided by an extension.
+ */
+export default class ExtensionPageResolver extends DefaultResolver {
+  static extension: string | null = null;
+
+  onmatch(args, requestedPath, route) {
+    const extensionPage = app.extensionData.getPage(args.id);
+
+    if (extensionPage) {
+      return extensionPage;
+    }
+
+    return super.onmatch(args, requestedPath, route);
+  }
+}

js/src/admin/routes.js

@@ -2,8 +2,9 @@ import DashboardPage from './components/DashboardPage';
 import BasicsPage from './components/BasicsPage';
 import PermissionsPage from './components/PermissionsPage';
 import AppearancePage from './components/AppearancePage';
-import ExtensionsPage from './components/ExtensionsPage';
 import MailPage from './components/MailPage';
+import ExtensionPage from './components/ExtensionPage';
+import ExtensionPageResolver from './resolvers/ExtensionPageResolver';
 
 /**
  * The `routes` initializer defines the forum app's routes.
@@ -16,7 +17,7 @@ export default function (app) {
     basics: { path: '/basics', component: BasicsPage },
     permissions: { path: '/permissions', component: PermissionsPage },
     appearance: { path: '/appearance', component: AppearancePage },
-    extensions: { path: '/extensions', component: ExtensionsPage },
     mail: { path: '/mail', component: MailPage },
+    extension: { path: '/extension/:id', component: ExtensionPage, resolverClass: ExtensionPageResolver },
   };
 }

js/src/admin/utils/ExtensionData.js

@@ -0,0 +1,177 @@
+import ItemList from '../../common/utils/ItemList';
+
+export default class ExtensionData {
+  constructor() {
+    this.data = {};
+    this.currentExtension = null;
+  }
+
+  /**
+   * This function simply takes the extension id
+   *
+   * @example
+   * app.extensionData.load('flarum-tags')
+   *
+   * flarum/flags -> flarum-flags | acme/extension -> acme-extension
+   *
+   * @param extension
+   */
+  for(extension) {
+    this.currentExtension = extension;
+    this.data[extension] = this.data[extension] || {};
+
+    return this;
+  }
+
+  /**
+   * This function registers your settings with Flarum
+   *
+   * It takes either a settings object or a callback.
+   *
+   * @example
+   *
+   * .registerSetting({
+   *   setting: 'flarum-flags.guidelines_url',
+   *   type: 'text', // This will be inputted into the input tag for the setting (text/number/etc)
+   *   label: app.translator.trans('flarum-flags.admin.settings.guidelines_url_label')
+   * }, 15) // priority is optional (ItemList)
+   *
+   *
+   * @param content
+   * @param priority
+   * @returns {ExtensionData}
+   */
+  registerSetting(content, priority = 0) {
+    this.data[this.currentExtension].settings = this.data[this.currentExtension].settings || new ItemList();
+
+    // Callbacks can be passed in instead of settings to display custom content.
+    // By default, they will be added with the `null` key, since they don't have a `.setting` attr.
+    // To support multiple such items for one extension, we assign a random ID.
+    // 36 is arbitrary length, but makes collisions very unlikely.
+    if (typeof content === 'function') {
+      content.setting = Math.random().toString(36);
+    }
+
+    this.data[this.currentExtension].settings.add(content.setting, content, priority);
+
+    return this;
+  }
+
+  /**
+   * This function registers your permission with Flarum
+   *
+   * @example
+   *
+   * .registerPermission('permissions', {
+   *     icon: 'fas fa-flag',
+   *     label: app.translator.trans('flarum-flags.admin.permissions.view_flags_label'),
+   *     permission: 'discussion.viewFlags'
+   * }, 'moderate', 65)
+   *
+   * @param content
+   * @param permissionType
+   * @param priority
+   * @returns {ExtensionData}
+   */
+  registerPermission(content, permissionType = null, priority = 0) {
+    this.data[this.currentExtension].permissions = this.data[this.currentExtension].permissions || {};
+
+    if (!this.data[this.currentExtension].permissions[permissionType]) {
+      this.data[this.currentExtension].permissions[permissionType] = new ItemList();
+    }
+
+    this.data[this.currentExtension].permissions[permissionType].add(content.permission, content, priority);
+
+    return this;
+  }
+
+  /**
+   * Replace the default extension page with a custom component.
+   * This component would typically extend ExtensionPage
+   *
+   * @param component
+   * @returns {ExtensionData}
+   */
+  registerPage(component) {
+    this.data[this.currentExtension].page = component;
+
+    return this;
+  }
+
+  /**
+   * Get an extension's registered settings
+   *
+   * @param extensionId
+   * @returns {boolean|*}
+   */
+  getSettings(extensionId) {
+    if (this.data[extensionId] && this.data[extensionId].settings) {
+      return this.data[extensionId].settings.toArray();
+    }
+
+    return false;
+  }
+
+  /**
+   *
+   * Get an ItemList of all extensions' registered permissions
+   *
+   * @param extension
+   * @param type
+   * @returns {ItemList}
+   */
+  getAllExtensionPermissions(type) {
+    const items = new ItemList();
+
+    Object.keys(this.data).map((extension) => {
+      if (this.extensionHasPermissions(extension) && this.data[extension].permissions[type]) {
+        items.merge(this.data[extension].permissions[type]);
+      }
+    });
+
+    return items;
+  }
+
+  /**
+   * Get a singular extension's registered permissions
+   *
+   * @param extension
+   * @param type
+   * @returns {boolean|*}
+   */
+  getExtensionPermissions(extension, type) {
+    if (this.extensionHasPermissions(extension) && this.data[extension].permissions[type]) {
+      return this.data[extension].permissions[type];
+    }
+
+    return new ItemList();
+  }
+
+  /**
+   * Checks whether a given extension has registered permissions.
+   *
+   * @param extension
+   * @returns {boolean}
+   */
+  extensionHasPermissions(extension) {
+    if (this.data[extension] && this.data[extension].permissions) {
+      return true;
+    }
+
+    return false;
+  }
+
+  /**
+   * Returns an extension's custom page component if it exists.
+   *
+   * @param extension
+   * @returns {boolean|*}
+   */
+  getPage(extension) {
+    if (this.data[extension]) {
+      return this.data[extension].page;
+    }
+
+    return false;
+  }
+}

js/src/admin/utils/getCategorizedExtensions.js

@@ -0,0 +1,25 @@
+export default function getCategorizedExtensions() {
+  let extensions = {};
+
+  Object.keys(app.data.extensions).map((id) => {
+    const extension = app.data.extensions[id];
+    let category = extension.extra['flarum-extension'].category;
+
+    // Wrap languages packs into new system
+    if (extension.extra['flarum-locale']) {
+      category = 'language';
+    }
+
+    if (category in app.extensionCategories) {
+      extensions[category] = extensions[category] || [];
+
+      extensions[category].push(extension);
+    } else {
+      extensions.other = extensions.other || [];
+
+      extensions.other.push(extension);
+    }
+  });
+
+  return extensions;
+}

js/src/admin/utils/isExtensionEnabled.js

@@ -0,0 +1,5 @@
+export default function isExtensionEnabled(name) {
+  const enabled = JSON.parse(app.data.settings.extensions_enabled);
+
+  return enabled.includes(name);
+}

js/src/common/Application.js

@@ -198,13 +198,19 @@ export default class Application {
     m.route(document.getElementById('content'), basePath + '/', mapRoutes(this.routes, basePath));
 
     // Add a class to the body which indicates that the page has been scrolled
-    // down.
-    new ScrollListener((top) => {
+    // down. When this happens, we'll add classes to the header and app body
+    // which will set the navbar's position to fixed. We don't want to always
+    // have it fixed, as that could overlap with custom headers.
+    const scrollListener = new ScrollListener((top) => {
       const $app = $('#app');
       const offset = $app.offset().top;
 
       $app.toggleClass('affix', top >= offset).toggleClass('scrolled', top > offset);
-    }).start();
+      $('.App-header').toggleClass('navbar-fixed-top', top >= offset);
+    });
+
+    scrollListener.start();
+    scrollListener.update();
 
     $(() => {
       $('body').addClass('ontouchstart' in window ? 'touch' : 'no-touch');
@@ -264,7 +270,7 @@ export default class Application {
 
   updateTitle() {
     const count = this.titleCount ? `(${this.titleCount}) ` : '';
-    const pageTitleWithSeparator = this.title && m.route.get() !== '/' ? this.title + ' - ' : '';
+    const pageTitleWithSeparator = this.title && m.route.get() !== this.forum.attribute('basePath') + '/' ? this.title + ' - ' : '';
     const title = this.forum.attribute('title');
     document.title = count + pageTitleWithSeparator + title;
   }

js/src/common/Component.ts

@@ -1,8 +1,5 @@
 import * as Mithril from 'mithril';
 
-let deprecatedPropsWarned = false;
-let deprecatedInitPropsWarned = false;
-
 export interface ComponentAttrs extends Mithril.Attributes {}
 
 /**
@@ -131,38 +128,5 @@ export default abstract class Component<T extends ComponentAttrs = ComponentAttr
    *
    * This can be used to assign default values for missing, optional attrs.
    */
-  protected static initAttrs<T>(attrs: T): void {
-    // Deprecated, part of Mithril 2 BC layer
-    if ('initProps' in this && !deprecatedInitPropsWarned) {
-      deprecatedInitPropsWarned = true;
-      console.warn('initProps is deprecated, please use initAttrs instead.');
-      (this as any).initProps(attrs);
-    }
-  }
-
-  // BEGIN DEPRECATED MITHRIL 2 BC LAYER
-
-  /**
-   * The attributes passed into the component.
-   *
-   * @see https://mithril.js.org/components.html#passing-data-to-components
-   *
-   * @deprecated, use attrs instead.
-   */
-  get props() {
-    if (!deprecatedPropsWarned) {
-      deprecatedPropsWarned = true;
-      console.warn('this.props is deprecated, please use this.attrs instead.');
-    }
-    return this.attrs;
-  }
-  set props(props) {
-    if (!deprecatedPropsWarned) {
-      deprecatedPropsWarned = true;
-      console.warn('this.props is deprecated, please use this.attrs instead.');
-    }
-    this.attrs = props;
-  }
-
-  // END DEPRECATED MITHRIL 2 BC LAYER
+  protected static initAttrs<T>(attrs: T): void {}
 }

js/src/common/compat.js

@@ -19,7 +19,9 @@ import extract from './utils/extract';
 import ScrollListener from './utils/ScrollListener';
 import stringToColor from './utils/stringToColor';
 import subclassOf from './utils/subclassOf';
+import SuperTextarea from './utils/SuperTextarea';
 import patchMithril from './utils/patchMithril';
+import proxifyCompat from './utils/proxifyCompat';
 import classList from './utils/classList';
 import extractText from './utils/extractText';
 import formatNumber from './utils/formatNumber';
@@ -67,6 +69,7 @@ import username from './helpers/username';
 import userOnline from './helpers/userOnline';
 import listItems from './helpers/listItems';
 import Fragment from './Fragment';
+import DefaultResolver from './resolvers/DefaultResolver';
 
 export default {
   extend: extend,
@@ -89,8 +92,10 @@ export default {
   'utils/stringToColor': stringToColor,
   'utils/Stream': Stream,
   'utils/subclassOf': subclassOf,
+  'utils/SuperTextarea': SuperTextarea,
   'utils/setRouteWithForcedRefresh': setRouteWithForcedRefresh,
   'utils/patchMithril': patchMithril,
+  'utils/proxifyCompat': proxifyCompat,
   'utils/classList': classList,
   'utils/extractText': extractText,
   'utils/formatNumber': formatNumber,
@@ -138,4 +143,5 @@ export default {
   'helpers/username': username,
   'helpers/userOnline': userOnline,
   'helpers/listItems': listItems,
+  'resolvers/DefaultResolver': DefaultResolver,
 };

js/src/common/components/Button.js

@@ -35,6 +35,11 @@ export default class Button extends Component {
       attrs['aria-label'] = attrs.title;
     }
 
+    // If given a translation object, extract the text.
+    if (typeof attrs.title === 'object') {
+      attrs.title = extractText(attrs.title);
+    }
+
     // If nothing else is provided, we use the textual button content as tooltip
     if (!attrs.title && vnode.children) {
       attrs.title = extractText(vnode.children);

js/src/common/components/LinkButton.js

@@ -12,12 +12,14 @@ import Link from './Link';
  *   active.
  * - `href` The URL to link to. If the current URL `m.route()` matches this,
  *   the `active` prop will automatically be set to true.
+ * - `force` Whether the page should be fully rerendered. Defaults to `true`.
  */
 export default class LinkButton extends Button {
   static initAttrs(attrs) {
     super.initAttrs(attrs);
 
     attrs.active = this.isActive(attrs);
+    if (attrs.force === undefined) attrs.force = true;
   }
 
   view(vnode) {

js/src/common/components/Modal.js

@@ -35,7 +35,8 @@ export default class Modal extends Component {
       this.attrs.animateHide();
       // Here, we ensure that the animation has time to complete.
       // See https://mithril.js.org/lifecycle-methods.html#onbeforeremove
-      return new Promise((resolve) => setTimeout(resolve, 1000));
+      // Bootstrap's Modal.TRANSITION_DURATION is 300 ms.
+      return new Promise((resolve) => setTimeout(resolve, 300));
     }
   }
 

js/src/common/components/Page.js

@@ -10,7 +10,11 @@ export default class Page extends Component {
   oninit(vnode) {
     super.oninit(vnode);
 
-    this.onNewRoute();
+    app.previous = app.current;
+    app.current = new PageState(this.constructor, { routeName: this.attrs.routeName });
+
+    app.drawer.hide();
+    app.modal.close();
 
     /**
      * A class name to apply to the body while the route is active.
@@ -18,20 +22,20 @@ export default class Page extends Component {
      * @type {String}
      */
     this.bodyClass = '';
-  }
 
-  /**
-   * A collections of actions to run when the route changes.
-   * This is extracted here, and not hardcoded in oninit, as oninit is not called
-   * when a different route is handled by the same component, but we still need to
-   * adjust the current route name.
-   */
-  onNewRoute() {
-    app.previous = app.current;
-    app.current = new PageState(this.constructor, { routeName: this.attrs.routeName });
+    /**
+     * Whether we should scroll to the top of the page when its rendered.
+     *
+     * @type {Boolean}
+     */
+    this.scrollTopOnCreate = true;
 
-    app.drawer.hide();
-    app.modal.close();
+    /**
+     * Whether the browser should restore scroll state on refreshes.
+     *
+     * @type {Boolean}
+     */
+    this.useBrowserScrollRestoration = true;
   }
 
   oncreate(vnode) {
@@ -40,6 +44,14 @@ export default class Page extends Component {
     if (this.bodyClass) {
       $('#app').addClass(this.bodyClass);
     }
+
+    if (this.scrollTopOnCreate) {
+      $(window).scrollTop(0);
+    }
+
+    if ('scrollRestoration' in history) {
+      history.scrollRestoration = this.useBrowserScrollRestoration ? 'auto' : 'manual';
+    }
   }
 
   onremove() {

js/src/common/components/SelectDropdown.js

@@ -12,6 +12,9 @@ import icon from '../helpers/icon';
 function isActive(vnode) {
   const tag = vnode.tag;
 
+  // Allow non-selectable dividers/headers to be added.
+  if (typeof tag === 'string' && tag !== 'a' && tag !== 'button') return false;
+
   if ('initAttrs' in tag) {
     tag.initAttrs(vnode.attrs);
   }

js/src/common/helpers/fullTime.tsx

@@ -1,11 +1,11 @@
+import dayjs from 'dayjs';
+import * as Mithril from 'mithril';
+
 /**
  * The `fullTime` helper displays a formatted time string wrapped in a <time>
  * tag.
- *
- * @param {Date} time
- * @return {Object}
  */
-export default function fullTime(time) {
+export default function fullTime(time: Date): Mithril.Vnode {
   const d = dayjs(time);
 
   const datetime = d.format();

js/src/common/helpers/humanTime.tsx

@@ -1,14 +1,13 @@
+import dayjs from 'dayjs';
+import * as Mithril from 'mithril';
 import humanTimeUtil from '../utils/humanTime';
 
 /**
  * The `humanTime` helper displays a time in a human-friendly time-ago format
  * (e.g. '12 days ago'), wrapped in a <time> tag with other information about
  * the time.
- *
- * @param {Date} time
- * @return {Object}
  */
-export default function humanTime(time) {
+export default function humanTime(time: Date): Mithril.Vnode {
   const d = dayjs(time);
 
   const datetime = d.format();

js/src/common/index.js

@@ -1,6 +1,6 @@
 import 'expose-loader?$!expose-loader?jQuery!jquery';
 import 'expose-loader?m!mithril';
-import 'expose-loader?moment!expose-loader?dayjs!dayjs';
+import 'expose-loader?dayjs!dayjs';
 import 'expose-loader?m.bidi!m.attrs.bidi';
 import 'bootstrap/js/affix';
 import 'bootstrap/js/dropdown';

js/src/common/models/User.js

@@ -10,6 +10,7 @@ export default class User extends Model {}
 
 Object.assign(User.prototype, {
   username: Model.attribute('username'),
+  slug: Model.attribute('slug'),
   displayName: Model.attribute('displayName'),
   email: Model.attribute('email'),
   isEmailConfirmed: Model.attribute('isEmailConfirmed'),

js/src/common/resolvers/DefaultResolver.ts

@@ -0,0 +1,41 @@
+import Mithril from 'mithril';
+
+/**
+ * Generates a route resolver for a given component.
+ * In addition to regular route resolver functionality:
+ * - It provide the current route name as an attr
+ * - It sets a key on the component so a rerender will be triggered on route change.
+ */
+export default class DefaultResolver {
+  component: Mithril.Component;
+  routeName: string;
+
+  constructor(component, routeName) {
+    this.component = component;
+    this.routeName = routeName;
+  }
+
+  /**
+   * When a route change results in a changed key, a full page
+   * rerender occurs. This method can be overriden in subclasses
+   * to prevent rerenders on some route changes.
+   */
+  makeKey() {
+    return this.routeName + JSON.stringify(m.route.param());
+  }
+
+  makeAttrs(vnode) {
+    return {
+      ...vnode.attrs,
+      routeName: this.routeName,
+    };
+  }
+
+  onmatch(args, requestedPath, route) {
+    return this.component;
+  }
+
+  render(vnode) {
+    return [{ ...vnode, attrs: this.makeAttrs(vnode), key: this.makeKey() }];
+  }
+}

js/src/common/utils/Pagination.ts

@@ -0,0 +1,80 @@
+export default class Pagination<T> {
+  private readonly loadFunction: (page: number) => Promise<any>;
+
+  public loading = {
+    prev: false,
+    next: false,
+  };
+
+  public page: number;
+
+  public data: { [page: number]: T } = {};
+
+  public pages: {
+    first: number;
+    last: number;
+  };
+
+  constructor(load: (page: number) => Promise<any>, page: number = 1) {
+    this.loadFunction = load;
+    this.page = page;
+
+    this.pages = {
+      first: page,
+      last: page,
+    };
+  }
+
+  clear() {
+    this.data = {};
+  }
+
+  refresh(page: number) {
+    this.clear();
+
+    this.page = page;
+    this.pages.last = page - 1;
+    this.pages.first = page;
+
+    return this.loadNext();
+  }
+
+  loadNext() {
+    this.loading.next = true;
+    const page = this.pages.last + 1;
+
+    return this.load(
+      page,
+      () => (this.loading.next = false),
+      () => (this.pages.last = this.page = page)
+    );
+  }
+
+  loadPrev() {
+    this.loading.prev = true;
+    const page = this.pages.first - 1;
+
+    return this.load(
+      page,
+      () => (this.loading.prev = false),
+      () => (this.pages.first = this.page = page)
+    );
+  }
+
+  private load(page, done, success) {
+    return this.loadFunction(page)
+      .then((out) => {
+        done();
+        success();
+
+        this.data[this.page] = out;
+
+        return out;
+      })
+      .catch((err) => {
+        done();
+
+        return Promise.reject(err);
+      });
+  }
+}

js/src/common/utils/ScrollListener.js

@@ -58,7 +58,7 @@ export default class ScrollListener {
    */
   start() {
     if (!this.active) {
-      window.addEventListener('scroll', (this.active = this.loop.bind(this)));
+      window.addEventListener('scroll', (this.active = this.loop.bind(this)), { passive: true });
     }
   }
 

js/src/common/utils/humanTime.ts

@@ -1,3 +1,6 @@
+import dayjs from 'dayjs';
+import 'dayjs/plugin/relativeTime';
+
 /**
  * The `humanTime` utility converts a date to a localized, human-readable time-
  * ago string.

js/src/common/utils/mapRoutes.js

@@ -1,6 +1,9 @@
+import DefaultResolver from '../resolvers/DefaultResolver';
+
 /**
  * The `mapRoutes` utility converts a map of named application routes into a
- * format that can be understood by Mithril.
+ * format that can be understood by Mithril, and wraps them in route resolvers
+ * to provide each route with the current route name.
  *
  * @see https://mithril.js.org/route.html#signature
  * @param {Object} routes
@@ -10,14 +13,17 @@
 export default function mapRoutes(routes, basePath = '') {
   const map = {};
 
-  for (const key in routes) {
-    const route = routes[key];
+  for (const routeName in routes) {
+    const route = routes[routeName];
 
-    map[basePath + route.path] = {
-      render() {
-        return m(route.component, { routeName: key });
-      },
-    };
+    if ('resolver' in route) {
+      map[basePath + route.path] = route.resolver;
+    } else if ('component' in route) {
+      const resolverClass = 'resolverClass' in route ? route.resolverClass : DefaultResolver;
+      map[basePath + route.path] = new resolverClass(route.component, routeName);
+    } else {
+      throw new Error(`Either a resolver or a component must be provided for the route [${routeName}]`);
+    }
   }
 
   return map;

js/src/common/utils/patchMithril.js

@@ -1,9 +1,3 @@
-import withAttr from './withAttr';
-import Stream from './Stream';
-
-let deprecatedMPropWarned = false;
-let deprecatedMWithAttrWarned = false;
-
 export default function patchMithril(global) {
   const defaultMithril = global.m;
 
@@ -22,23 +16,5 @@ export default function patchMithril(global) {
 
   Object.keys(defaultMithril).forEach((key) => (modifiedMithril[key] = defaultMithril[key]));
 
-  // BEGIN DEPRECATED MITHRIL 2 BC LAYER
-  modifiedMithril.prop = function (...args) {
-    if (!deprecatedMPropWarned) {
-      deprecatedMPropWarned = true;
-      console.warn('m.prop() is deprecated, please use the Stream util (flarum/utils/Streams) instead.');
-    }
-    return Stream.bind(this)(...args);
-  };
-
-  modifiedMithril.withAttr = function (...args) {
-    if (!deprecatedMWithAttrWarned) {
-      deprecatedMWithAttrWarned = true;
-      console.warn("m.withAttr() is deprecated, please use flarum's withAttr util (flarum/utils/withAttr) instead.");
-    }
-    return withAttr.bind(this)(...args);
-  };
-  // END DEPRECATED MITHRIL 2 BC LAYER
-
   global.m = modifiedMithril;
 }

js/src/common/utils/proxifyCompat.ts

@@ -0,0 +1,10 @@
+export default (compat: { [key: string]: any }, namespace: string) => {
+  // regex to replace common/ and NAMESPACE/ for core & core extensions
+  // e.g. admin/utils/extract --> utils/extract
+  // e.g. tags/common/utils/sortTags --> tags/utils/sortTags
+  const regex = new RegExp(`(\\w+\\/)?(${namespace}|common)\\/`);
+
+  return new Proxy(compat, {
+    get: (obj, prop: string) => obj[prop] || obj[prop.replace(regex, '$1')],
+  });
+};

js/src/forum/ForumApplication.js

@@ -90,11 +90,6 @@ export default class ForumApplication extends Application {
      * @type {DiscussionListState}
      */
     this.discussions = new DiscussionListState({}, this);
-
-    /**
-     * @deprecated beta 14, remove in beta 15.
-     */
-    this.cache.discussionList = this.discussions;
   }
 
   /**
@@ -115,17 +110,19 @@ export default class ForumApplication extends Application {
     this.routes[defaultAction].path = '/';
     this.history.push(defaultAction, this.translator.trans('core.forum.header.back_to_index_tooltip'), '/');
 
+    this.pane = new Pane(document.getElementById('app'));
+
+    m.route.prefix = '';
+    super.mount(this.forum.attribute('basePath'));
+
+    // We mount navigation and header components after the page, so components
+    // like the back button can access the updated state when rendering.
     m.mount(document.getElementById('app-navigation'), { view: () => Navigation.component({ className: 'App-backControl', drawer: true }) });
     m.mount(document.getElementById('header-navigation'), Navigation);
     m.mount(document.getElementById('header-primary'), HeaderPrimary);
     m.mount(document.getElementById('header-secondary'), HeaderSecondary);
     m.mount(document.getElementById('composer'), { view: () => Composer.component({ state: this.composer }) });
 
-    this.pane = new Pane(document.getElementById('app'));
-
-    m.route.prefix = '';
-    super.mount(this.forum.attribute('basePath'));
-
     alertEmailConfirmation(this);
 
     // Route the home link back home when clicked. We do not want it to register

js/src/forum/compat.js

@@ -71,6 +71,7 @@ import Search from './components/Search';
 import DiscussionListItem from './components/DiscussionListItem';
 import LoadingPost from './components/LoadingPost';
 import PostsUserPage from './components/PostsUserPage';
+import DiscussionPageResolver from './resolvers/DiscussionPageResolver';
 import routes from './routes';
 import ForumApplication from './ForumApplication';
 
@@ -146,6 +147,7 @@ export default Object.assign(compat, {
   'components/DiscussionListItem': DiscussionListItem,
   'components/LoadingPost': LoadingPost,
   'components/PostsUserPage': PostsUserPage,
+  'resolvers/DiscussionPageResolver': DiscussionPageResolver,
   routes: routes,
   ForumApplication: ForumApplication,
 });

js/src/forum/components/ChangeEmailModal.js

@@ -118,7 +118,10 @@ export default class ChangeEmailModal extends Modal {
           meta: { password: this.password() },
         }
       )
-      .then(() => (this.success = true))
+      .then(() => {
+        this.success = true;
+        this.alertAttrs = null;
+      })
       .catch(() => {})
       .then(this.loaded.bind(this));
   }

js/src/forum/components/CommentPost.js

@@ -56,9 +56,7 @@ export default class CommentPost extends Post {
     ]);
   }
 
-  onupdate(vnode) {
-    super.onupdate();
-
+  refreshContent() {
     const contentHtml = this.isEditing() ? '' : this.attrs.post.contentHtml();
 
     // If the post content has changed since the last render, we'll run through
@@ -66,13 +64,28 @@ export default class CommentPost extends Post {
     // necessary because TextFormatter outputs them for e.g. syntax highlighting.
     if (this.contentHtml !== contentHtml) {
       this.$('.Post-body script').each(function () {
-        eval.call(window, $(this).text());
+        const script = document.createElement('script');
+        script.textContent = this.textContent;
+        Array.from(this.attributes).forEach((attr) => script.setAttribute(attr.name, attr.value));
+        this.parentNode.replaceChild(script, this);
       });
     }
 
     this.contentHtml = contentHtml;
   }
 
+  oncreate(vnode) {
+    super.oncreate(vnode);
+
+    this.refreshContent();
+  }
+
+  onupdate(vnode) {
+    super.onupdate(vnode);
+
+    this.refreshContent();
+  }
+
   isEditing() {
     return app.composer.bodyMatches(EditPostComposer, { post: this.attrs.post });
   }

js/src/forum/components/Composer.js

@@ -199,7 +199,7 @@ export default class Composer extends Component {
    */
   animatePositionChange() {
     // When exiting full-screen mode: focus content
-    if (this.prevPosition === ComposerState.Position.FULLSCREEN) {
+    if (this.prevPosition === ComposerState.Position.FULLSCREEN && this.state.position === ComposerState.Position.NORMAL) {
       this.focus();
       return;
     }
@@ -265,7 +265,7 @@ export default class Composer extends Component {
     this.animateHeightChange().then(() => this.focus());
 
     if (app.screen() === 'phone') {
-      this.$().css('top', $(window).scrollTop());
+      this.$().css('top', 0);
       this.showBackdrop();
     }
   }

js/src/forum/components/ComposerBody.js

@@ -44,12 +44,6 @@ export default class ComposerBody extends Component {
     }
 
     this.composer.fields.content(this.attrs.originalContent || '');
-
-    /**
-     * @deprecated BC layer, remove in Beta 15.
-     */
-    this.content = this.composer.fields.content;
-    this.editor = this.composer;
   }
 
   view() {

js/src/forum/components/DiscussionComposer.js

@@ -100,7 +100,7 @@ export default class DiscussionComposer extends ComposerBody {
       .save(data)
       .then((discussion) => {
         this.composer.hide();
-        app.discussions.refresh();
+        app.discussions.refresh({ deferClear: true });
         m.route.set(app.route.discussion(discussion));
       }, this.loaded.bind(this));
   }

js/src/forum/components/DiscussionList.js

@@ -21,13 +21,7 @@ export default class DiscussionList extends Component {
     if (state.isLoading()) {
       loading = LoadingIndicator.component();
     } else if (state.moreResults) {
-      loading = Button.component(
-        {
-          className: 'Button',
-          onclick: state.loadMore.bind(state),
-        },
-        app.translator.trans('core.forum.discussion_list.load_more_button')
-      );
+      loading = this.getLoadButton('more', state.loadMore.bind(state));
     }
 
     if (state.empty()) {
@@ -35,8 +29,18 @@ export default class DiscussionList extends Component {
       return <div className="DiscussionList">{Placeholder.component({ text })}</div>;
     }
 
+    console.log(state);
+
     return (
       <div className={'DiscussionList' + (state.isSearchResults() ? ' DiscussionList--searchResults' : '')}>
+        {state.isLoadingPrev() ? (
+          <LoadingIndicator />
+        ) : state.pagination.pages.first !== 1 ? (
+          <div className="DiscussionList-loadMore">{this.getLoadButton('prev', state.loadPrev.bind(state))}</div>
+        ) : (
+          ''
+        )}
+
         <ul className="DiscussionList-discussions">
           {state.discussions.map((discussion) => {
             return (
@@ -46,8 +50,17 @@ export default class DiscussionList extends Component {
             );
           })}
         </ul>
+
         <div className="DiscussionList-loadMore">{loading}</div>
       </div>
     );
   }
+
+  getLoadButton(key, onclick) {
+    return (
+      <Button className="Button" onclick={onclick}>
+        {app.translator.trans(`core.forum.discussion_list.load_${key}_button`)}
+      </Button>
+    );
+  }
 }

js/src/forum/components/DiscussionListItem.js

@@ -14,6 +14,7 @@ import DiscussionControls from '../utils/DiscussionControls';
 import slidable from '../utils/slidable';
 import extractText from '../../common/utils/extractText';
 import classList from '../../common/utils/classList';
+import DiscussionPage from './DiscussionPage';
 
 import { escapeRegExp } from 'lodash-es';
 /**
@@ -91,12 +92,12 @@ export default class DiscussionListItem extends Component {
             )
           : ''}
 
-        <a
+        <span
           className={'Slidable-underneath Slidable-underneath--left Slidable-underneath--elastic' + (isUnread ? '' : ' disabled')}
           onclick={this.markAsRead.bind(this)}
         >
           {icon('fas fa-check')}
-        </a>
+        </span>
 
         <div className={'DiscussionListItem-content Slidable-content' + (isUnread ? ' unread' : '') + (isRead ? ' read' : '')}>
           <Link
@@ -156,9 +157,7 @@ export default class DiscussionListItem extends Component {
    * @return {Boolean}
    */
   active() {
-    const idParam = m.route.param('id');
-
-    return idParam && idParam.split('-')[0] === this.attrs.discussion.id();
+    return app.current.matches(DiscussionPage, { discussion: this.attrs.discussion });
   }
 
   /**

js/src/forum/components/DiscussionPage.js

@@ -18,6 +18,8 @@ export default class DiscussionPage extends Page {
   oninit(vnode) {
     super.oninit(vnode);
 
+    this.useBrowserScrollRestoration = false;
+
     /**
      * The discussion that is being viewed.
      *
@@ -47,8 +49,6 @@ export default class DiscussionPage extends Page {
     app.history.push('discussion');
 
     this.bodyClass = 'App--discussion';
-
-    this.prevRoute = m.route.get();
   }
 
   onremove() {
@@ -84,7 +84,6 @@ export default class DiscussionPage extends Page {
                     {PostStream.component({
                       discussion,
                       stream: this.stream,
-                      targetPost: this.stream.targetPost,
                       onPositionChange: this.positionChanged.bind(this),
                     })}
                   </div>
@@ -96,34 +95,6 @@ export default class DiscussionPage extends Page {
     );
   }
 
-  onbeforeupdate(vnode) {
-    super.onbeforeupdate(vnode);
-
-    if (m.route.get() !== this.prevRoute) {
-      this.prevRoute = m.route.get();
-
-      // If we have routed to the same discussion as we were viewing previously,
-      // cancel the unloading of this controller and instead prompt the post
-      // stream to jump to the new 'near' param.
-      if (this.discussion) {
-        const idParam = m.route.param('id');
-
-        if (idParam && idParam.split('-')[0] === this.discussion.id()) {
-          const near = m.route.param('near') || '1';
-
-          if (near !== String(this.near)) {
-            this.stream.goToNumber(near);
-          }
-
-          this.near = near;
-        } else {
-          this.onNewRoute();
-          this.oninit(vnode);
-        }
-      }
-    }
-  }
-
   /**
    * Load the discussion from the API or use the preloaded one.
    */
@@ -138,7 +109,7 @@ export default class DiscussionPage extends Page {
     } else {
       const params = this.requestParams();
 
-      app.store.find('discussions', m.route.param('id').split('-')[0], params).then(this.show.bind(this));
+      app.store.find('discussions', m.route.param('id'), params).then(this.show.bind(this));
     }
 
     m.redraw();
@@ -152,6 +123,7 @@ export default class DiscussionPage extends Page {
    */
   requestParams() {
     return {
+      bySlug: true,
       page: { near: this.near },
     };
   }
@@ -186,7 +158,7 @@ export default class DiscussionPage extends Page {
             record.relationships.discussion.data.id === discussionId
         )
         .map((record) => app.store.getById('posts', record.id))
-        .sort((a, b) => a.id() - b.id())
+        .sort((a, b) => a.createdAt() - b.createdAt())
         .slice(0, 20);
     }
 
@@ -248,10 +220,7 @@ export default class DiscussionPage extends Page {
     // replace it into the window's history and our own history stack.
     const url = app.route.discussion(discussion, (this.near = startNumber));
 
-    this.prevRoute = url;
-    m.route.set(url, null, { replace: true });
     window.history.replaceState(null, document.title, url);
-
     app.history.push('discussion', discussion.title());
 
     // If the user hasn't read past here before, then we'll update their read

js/src/forum/components/IndexPage.js

@@ -42,26 +42,7 @@ export default class IndexPage extends Page {
     app.history.push('index', app.translator.trans('core.forum.header.back_to_index_tooltip'));
 
     this.bodyClass = 'App--index';
-
-    this.currentPath = m.route.get();
-  }
-
-  onbeforeupdate(vnode) {
-    super.onbeforeupdate(vnode);
-
-    const curPath = m.route.get();
-
-    if (this.currentPath !== curPath) {
-      this.onNewRoute();
-
-      app.discussions.clear();
-
-      app.discussions.refreshParams(app.search.params());
-
-      this.currentPath = curPath;
-
-      this.setTitle();
-    }
+    this.scrollTopOnCreate = false;
   }
 
   view() {
@@ -105,18 +86,22 @@ export default class IndexPage extends Page {
 
     $('#app').css('min-height', $(window).height() + heroHeight);
 
-    // Scroll to the remembered position. We do this after a short delay so that
-    // it happens after the browser has done its own "back button" scrolling,
-    // which isn't right. https://github.com/flarum/core/issues/835
-    const scroll = () => $(window).scrollTop(scrollTop - oldHeroHeight + heroHeight);
-    scroll();
-    setTimeout(scroll, 1);
+    // Let browser handle scrolling on page reload.
+    if (app.previous.type == null) return;
+
+    // When on mobile, only retain scroll if we're coming from a discussion page.
+    // Otherwise, we've just changed the filter, so we should go to the top of the page.
+    if (app.screen() == 'desktop' || app.screen() == 'desktop-hd' || this.lastDiscussion) {
+      $(window).scrollTop(scrollTop - oldHeroHeight + heroHeight);
+    } else {
+      $(window).scrollTop(0);
+    }
 
     // If we've just returned from a discussion page, then the constructor will
     // have set the `lastDiscussion` property. If this is the case, we want to
     // scroll down to that discussion so that it's in view.
     if (this.lastDiscussion) {
-      const $discussion = this.$(`.DiscussionListItem[data-id="${this.lastDiscussion.id()}"]`);
+      const $discussion = this.$(`li[data-id="${this.lastDiscussion.id()}"] .DiscussionListItem`);
 
       if ($discussion.length) {
         const indexTop = $('#header').outerHeight();
@@ -131,14 +116,16 @@ export default class IndexPage extends Page {
     }
   }
 
+  onbeforeremove() {
+    // Save the scroll position so we can restore it when we return to the
+    // discussion list.
+    app.cache.scrollTop = $(window).scrollTop();
+  }
+
   onremove() {
     super.onremove();
 
     $('#app').css('min-height', '');
-
-    // Save the scroll position so we can restore it when we return to the
-    // discussion list.
-    app.cache.scrollTop = $(window).scrollTop();
   }
 
   /**

js/src/forum/components/Notification.js

@@ -24,7 +24,7 @@ export default class Notification extends Component {
       <Link
         className={'Notification Notification--' + notification.contentType() + ' ' + (!notification.isRead() ? 'unread' : '')}
         href={href}
-        external={href.indexOf('://') === -1}
+        external={href.includes('://')}
         onclick={this.markAsRead.bind(this)}
       >
         {!notification.isRead() &&

js/src/forum/components/PostStream.js

@@ -32,6 +32,13 @@ export default class PostStream extends Component {
     const posts = this.stream.posts();
     const postIds = this.discussion.postIds();
 
+    const postFadeIn = (vnode) => {
+      $(vnode.dom).addClass('fadeIn');
+      // 500 is the duration of the fadeIn CSS animation + 100ms,
+      // so the animation has time to complete
+      setTimeout(() => $(vnode.dom).removeClass('fadeIn'), 500);
+    };
+
     const items = posts.map((post, i) => {
       let content;
       const attrs = { 'data-index': this.stream.visibleStart + i };
@@ -42,6 +49,7 @@ export default class PostStream extends Component {
         content = PostComponent ? PostComponent.component({ post }) : '';
 
         attrs.key = 'post' + post.id();
+        attrs.oncreate = postFadeIn;
         attrs['data-time'] = time.toISOString();
         attrs['data-number'] = post.number();
         attrs['data-id'] = post.id();
@@ -89,7 +97,7 @@ export default class PostStream extends Component {
     // is not already doing so, then show a 'write a reply' placeholder.
     if (viewingEnd && (!app.session.user || this.discussion.canReply())) {
       items.push(
-        <div className="PostStream-item" key="reply">
+        <div className="PostStream-item" key="reply" data-index={this.stream.count()} oncreate={postFadeIn}>
           {ReplyPlaceholder.component({ discussion: this.discussion })}
         </div>
       );
@@ -121,16 +129,15 @@ export default class PostStream extends Component {
    * Start scrolling, if appropriate, to a newly-targeted post.
    */
   triggerScroll() {
-    if (!this.attrs.targetPost || !this.stream.needsScroll) return;
+    if (!this.stream.needsScroll) return;
 
-    const newTarget = this.attrs.targetPost;
+    const target = this.stream.targetPost;
     this.stream.needsScroll = false;
 
-    if ('number' in newTarget) {
-      this.scrollToNumber(newTarget.number, this.stream.animateScroll);
-    } else if ('index' in newTarget) {
-      const backwards = newTarget.index === this.stream.count() - 1;
-      this.scrollToIndex(newTarget.index, this.stream.animateScroll, backwards);
+    if ('number' in target) {
+      this.scrollToNumber(target.number, this.stream.animateScroll);
+    } else if ('index' in target) {
+      this.scrollToIndex(target.index, this.stream.animateScroll, target.reply);
     }
   }
 
@@ -142,6 +149,11 @@ export default class PostStream extends Component {
    */
   onscroll(top = window.pageYOffset) {
     if (this.stream.paused) return;
+
+    this.updateScrubber(top);
+
+    if (this.stream.pagesLoading) return;
+
     const marginTop = this.getMarginTop();
     const viewportHeight = $(window).height() - marginTop;
     const viewportTop = top + marginTop;
@@ -167,8 +179,6 @@ export default class PostStream extends Component {
     // viewport) to 100ms.
     clearTimeout(this.calculatePositionTimeout);
     this.calculatePositionTimeout = setTimeout(this.calculatePosition.bind(this, top), 100);
-
-    this.updateScrubber(top);
   }
 
   updateScrubber(top = window.pageYOffset) {
@@ -181,9 +191,9 @@ export default class PostStream extends Component {
     // seen if the browser were scrolled right up to the top of the page,
     // and the viewport had a height of 0.
     const $items = this.$('.PostStream-item[data-index]');
-    let index = $items.first().data('index') || 0;
     let visible = 0;
     let period = '';
+    let indexFromViewPort = null;
 
     // Now loop through each of the items in the discussion. An 'item' is
     // either a single post or a 'gap' of one or more posts that haven't
@@ -209,8 +219,10 @@ export default class PostStream extends Component {
       const visibleBottom = Math.min(height, viewportTop + viewportHeight - top);
       const visiblePost = visibleBottom - visibleTop;
 
-      if (top <= viewportTop) {
-        index = parseFloat($this.data('index')) + visibleTop / height;
+      // We take the index of the first item that passed the previous checks.
+      // It is the item that is first visible in the viewport.
+      if (indexFromViewPort === null) {
+        indexFromViewPort = parseFloat($this.data('index')) + visibleTop / height;
       }
 
       if (visiblePost > 0) {
@@ -223,7 +235,10 @@ export default class PostStream extends Component {
       if (time) period = time;
     });
 
-    this.stream.index = index + 1;
+    // If indexFromViewPort is null, it means no posts are visible in the
+    // viewport. This can happen, when drafting a long reply post. In that case
+    // set the index to the last post.
+    this.stream.index = indexFromViewPort !== null ? indexFromViewPort + 1 : this.stream.count();
     this.stream.visible = visible;
     if (period) this.stream.description = dayjs(period).format('MMMM YYYY');
   }
@@ -275,7 +290,9 @@ export default class PostStream extends Component {
    * @return {Integer}
    */
   getMarginTop() {
-    return this.$() && $('#header').outerHeight() + parseInt(this.$().css('margin-top'), 10);
+    const headerId = app.screen() === 'phone' ? '#app-navigation' : '#header';
+
+    return this.$() && $(headerId).outerHeight() + parseInt(this.$().css('margin-top'), 10);
   }
 
   /**
@@ -296,18 +313,17 @@ export default class PostStream extends Component {
    *
    * @param {Integer} index
    * @param {Boolean} animate
-   * @param {Boolean} bottom Whether or not to scroll to the bottom of the post
-   *     at the given index, instead of the top of it.
+   * @param {Boolean} reply Whether or not to scroll to the reply placeholder.
    * @return {jQuery.Deferred}
    */
-  scrollToIndex(index, animate, bottom) {
-    const $item = this.$(`.PostStream-item[data-index=${index}]`);
+  scrollToIndex(index, animate, reply) {
+    const $item = reply ? $('.PostStream-item:last-child') : this.$(`.PostStream-item[data-index=${index}]`);
 
-    return this.scrollToItem($item, animate, true, bottom).then(() => {
-      if (index == this.stream.count() - 1) {
-        this.flashItem(this.$('.PostStream-item:last-child'));
-      }
-    });
+    this.scrollToItem($item, animate, true, reply);
+
+    if (reply) {
+      this.flashItem($item);
+    }
   }
 
   /**
@@ -317,11 +333,10 @@ export default class PostStream extends Component {
    * @param {Boolean} animate
    * @param {Boolean} force Whether or not to force scrolling to the item, even
    *     if it is already in the viewport.
-   * @param {Boolean} bottom Whether or not to scroll to the bottom of the post
-   *     at the given index, instead of the top of it.
+   * @param {Boolean} reply Whether or not to scroll to the reply placeholder.
    * @return {jQuery.Deferred}
    */
-  scrollToItem($item, animate, force, bottom) {
+  scrollToItem($item, animate, force, reply) {
     const $container = $('html, body').stop(true);
     const index = $item.data('index');
 
@@ -332,10 +347,10 @@ export default class PostStream extends Component {
       const scrollBottom = scrollTop + $(window).height();
 
       // If the item is already in the viewport, we may not need to scroll.
-      // If we're scrolling to the bottom of an item, then we'll make sure the
+      // If we're scrolling to the reply placeholder, we'll make sure its
       // bottom will line up with the top of the composer.
       if (force || itemTop < scrollTop || itemBottom > scrollBottom) {
-        const top = bottom ? itemBottom - $(window).height() + app.composer.computedHeight() : $item.is(':first-child') ? 0 : itemTop;
+        const top = reply ? itemBottom - $(window).height() + app.composer.computedHeight() : $item.is(':first-child') ? 0 : itemTop;
 
         if (!animate) {
           $container.scrollTop(top);
@@ -349,7 +364,7 @@ export default class PostStream extends Component {
       // We manually set the index because we want to display the index of the
       // exact post we've scrolled to, not just that of the first post within viewport.
       this.updateScrubber();
-      this.stream.index = index;
+      if (index !== undefined) this.stream.index = index + 1;
     };
 
     // If we don't update this before the scroll, the scrubber will start
@@ -360,18 +375,22 @@ export default class PostStream extends Component {
     return Promise.all([$container.promise(), this.stream.loadPromise]).then(() => {
       m.redraw.sync();
 
-      // After post data has been loaded in, we will attempt to scroll back
-      // to the top of the requested post (or to the top of the page if the
-      // first post was requested). In some cases, we may have scrolled to
-      // the end of the available post range, in which case, the next range
-      // of posts will be loaded in. However, in those cases, the post we
-      // requested won't exist, so scrolling to it would cause an error.
-      // Accordingly, we start by checking that it's offset is defined.
-      const offset = $(`.PostStream-item[data-index=${index}]`).offset();
-      if (index === 0) {
+      // Rendering post contents will probably throw off our position.
+      // To counter this, we'll scroll either:
+      //   - To the reply placeholder (aligned with composer top)
+      //   - To the top of the page if we're on the first post
+      //   - To the top of a post (if that post exists)
+      // If the post does not currently exist, it's probably
+      // outside of the range we loaded in, so we won't adjust anything,
+      // as it will soon be rendered by the "load more" system.
+      let itemOffset;
+      if (reply) {
+        const $placeholder = $('.PostStream-item:last-child');
+        $(window).scrollTop($placeholder.offset().top + $placeholder.height() - $(window).height() + app.composer.computedHeight());
+      } else if (index === 0) {
         $(window).scrollTop(0);
-      } else if (offset) {
-        $(window).scrollTop($(`.PostStream-item[data-index=${index}]`).offset().top - this.getMarginTop());
+      } else if ((itemOffset = $(`.PostStream-item[data-index=${index}]`).offset())) {
+        $(window).scrollTop(itemOffset.top - this.getMarginTop());
       }
 
       // We want to adjust this again after posts have been loaded in
@@ -389,10 +408,11 @@ export default class PostStream extends Component {
    * @param {jQuery} $item
    */
   flashItem($item) {
+    // This might execute before the fadeIn class has been removed in PostStreamItem's
+    // oncreate, so we remove it just to be safe and avoid a double animation.
+    $item.removeClass('fadeIn');
     $item.addClass('flash').on('animationend webkitAnimationEnd', (e) => {
-      if (e.animationName === 'fadeIn') {
-        $item.removeClass('flash');
-      }
+      $item.removeClass('flash');
     });
   }
 }

js/src/forum/components/Search.js

@@ -21,6 +21,8 @@ import UsersSearchSource from './UsersSearchSource';
  * - state: SearchState instance.
  */
 export default class Search extends Component {
+  static MIN_SEARCH_LEN = 3;
+
   oninit(vnode) {
     super.oninit(vnode);
     this.state = this.attrs.state;
@@ -152,7 +154,7 @@ export default class Search extends Component {
         search.searchTimeout = setTimeout(() => {
           if (state.isCached(query)) return;
 
-          if (query.length >= 3) {
+          if (query.length >= Search.MIN_SEARCH_LEN) {
             search.sources.map((source) => {
               if (!source.search) return;
 

js/src/forum/components/UserPage.js

@@ -27,19 +27,6 @@ export default class UserPage extends Page {
     this.user = null;
 
     this.bodyClass = 'App--user';
-
-    this.prevUsername = m.route.param('username');
-  }
-
-  onbeforeupdate() {
-    const currUsername = m.route.param('username');
-    if (currUsername !== this.prevUsername) {
-      this.onNewRoute();
-
-      this.prevUsername = currUsername;
-
-      this.loadUser(currUsername);
-    }
   }
 
   view() {
@@ -115,7 +102,7 @@ export default class UserPage extends Page {
     });
 
     if (!this.user) {
-      app.store.find('users', username).then(this.show.bind(this));
+      app.store.find('users', username, { bySlug: true }).then(this.show.bind(this));
     }
   }
 
@@ -148,7 +135,7 @@ export default class UserPage extends Page {
 
     items.add(
       'posts',
-      <LinkButton href={app.route('user.posts', { username: user.username() })} force icon="far fa-comment">
+      <LinkButton href={app.route('user.posts', { username: user.username() })} icon="far fa-comment">
         {app.translator.trans('core.forum.user.posts_link')} <span className="Button-badge">{user.commentCount()}</span>
       </LinkButton>,
       100
@@ -156,7 +143,7 @@ export default class UserPage extends Page {
 
     items.add(
       'discussions',
-      <LinkButton href={app.route('user.discussions', { username: user.username() })} force icon="fas fa-bars">
+      <LinkButton href={app.route('user.discussions', { username: user.username() })} icon="fas fa-bars">
         {app.translator.trans('core.forum.user.discussions_link')} <span className="Button-badge">{user.discussionCount()}</span>
       </LinkButton>,
       90

js/src/forum/index.js

@@ -15,8 +15,9 @@ export { app };
 // export { IndexPage, DicsussionList } from './components';
 
 // Export compat API
-import compat from './compat';
+import compatObj from './compat';
+import proxifyCompat from '../common/utils/proxifyCompat';
 
-compat.app = app;
+compatObj.app = app;
 
-export { compat };
+export const compat = proxifyCompat(compatObj, 'forum');

js/src/forum/resolvers/DiscussionPageResolver.ts

@@ -0,0 +1,55 @@
+import DefaultResolver from '../../common/resolvers/DefaultResolver';
+import DiscussionPage from '../components/DiscussionPage';
+
+/**
+ * A custom route resolver for DiscussionPage that generates the same key to all posts
+ * on the same discussion. It triggers a scroll when going from one post to another
+ * in the same discussion.
+ */
+export default class DiscussionPageResolver extends DefaultResolver {
+  static scrollToPostNumber: string | null = null;
+
+  /**
+   * Remove optional parts of a discussion's slug to keep the substring
+   * that bijectively maps to a discussion object. By default this just
+   * extracts the numerical ID from the slug. If a custom discussion
+   * slugging driver is used, this may need to be overriden.
+   * @param slug
+   */
+  canonicalizeDiscussionSlug(slug: string | undefined) {
+    if (!slug) return;
+    return slug.split('-')[0];
+  }
+
+  /**
+   * @inheritdoc
+   */
+  makeKey() {
+    const params = { ...m.route.param() };
+    if ('near' in params) {
+      delete params.near;
+    }
+    params.id = this.canonicalizeDiscussionSlug(params.id);
+    return this.routeName.replace('.near', '') + JSON.stringify(params);
+  }
+
+  onmatch(args, requestedPath, route) {
+    if (app.current.matches(DiscussionPage) && this.canonicalizeDiscussionSlug(args.id) === this.canonicalizeDiscussionSlug(m.route.param('id'))) {
+      // By default, the first post number of any discussion is 1
+      DiscussionPageResolver.scrollToPostNumber = args.near || '1';
+    }
+
+    return super.onmatch(args, requestedPath, route);
+  }
+
+  render(vnode) {
+    if (DiscussionPageResolver.scrollToPostNumber !== null) {
+      const number = DiscussionPageResolver.scrollToPostNumber;
+      // Scroll after a timeout to avoid clashes with the render.
+      setTimeout(() => app.current.get('stream').goToNumber(number));
+      DiscussionPageResolver.scrollToPostNumber = null;
+    }
+
+    return super.render(vnode);
+  }
+}

js/src/forum/routes.js

@@ -4,6 +4,7 @@ import PostsUserPage from './components/PostsUserPage';
 import DiscussionsUserPage from './components/DiscussionsUserPage';
 import SettingsPage from './components/SettingsPage';
 import NotificationsPage from './components/NotificationsPage';
+import DiscussionPageResolver from './resolvers/DiscussionPageResolver';
 
 /**
  * The `routes` initializer defines the forum app's routes.
@@ -14,8 +15,8 @@ export default function (app) {
   app.routes = {
     index: { path: '/all', component: IndexPage },
 
-    discussion: { path: '/d/:id', component: DiscussionPage },
-    'discussion.near': { path: '/d/:id/:near', component: DiscussionPage },
+    discussion: { path: '/d/:id', component: DiscussionPage, resolverClass: DiscussionPageResolver },
+    'discussion.near': { path: '/d/:id/:near', component: DiscussionPage, resolverClass: DiscussionPageResolver },
 
     user: { path: '/u/:username', component: PostsUserPage },
     'user.posts': { path: '/u/:username', component: PostsUserPage },
@@ -33,9 +34,8 @@ export default function (app) {
    * @return {String}
    */
   app.route.discussion = (discussion, near) => {
-    const slug = discussion.slug();
     return app.route(near && near !== 1 ? 'discussion.near' : 'discussion', {
-      id: discussion.id() + (slug.trim() ? '-' + slug : ''),
+      id: discussion.slug(),
       near: near && near !== 1 ? near : undefined,
     });
   };
@@ -58,7 +58,7 @@ export default function (app) {
    */
   app.route.user = (user) => {
     return app.route('user', {
-      username: user.username(),
+      username: user.slug(),
     });
   };
 }

js/src/forum/states/ComposerState.js

@@ -34,11 +34,6 @@ class ComposerState {
     this.editor = null;
 
     this.clear();
-
-    /**
-     * @deprecated BC layer, remove in Beta 15.
-     */
-    this.component = this;
   }
 
   /**
@@ -77,12 +72,6 @@ class ComposerState {
     this.fields = {
       content: Stream(''),
     };
-
-    /**
-     * @deprecated BC layer, remove in Beta 15.
-     */
-    this.content = this.fields.content;
-    this.value = this.fields.content;
   }
 
   /**

js/src/forum/states/DiscussionListState.js

@@ -1,4 +1,8 @@
+import Pagination from '../../common/utils/Pagination';
+
 export default class DiscussionListState {
+  static DISCUSSIONS_PER_PAGE = 20;
+
   constructor(params = {}, app = window.app) {
     this.params = params;
 
@@ -8,7 +12,7 @@ export default class DiscussionListState {
 
     this.moreResults = false;
 
-    this.loading = false;
+    this.pagination = new Pagination(this.load.bind(this));
   }
 
   /**
@@ -82,33 +86,16 @@ export default class DiscussionListState {
    * This can be used to refresh discussions without loading animations.
    */
   refresh({ deferClear = false } = {}) {
-    this.loading = true;
+    this.pagination.loading.next = true;
 
     if (!deferClear) {
       this.clear();
     }
 
-    return this.loadResults().then(
-      (results) => {
-        // This ensures that any changes made while waiting on this request
-        // are ignored. Otherwise, we could get duplicate discussions.
-        // We don't use `this.clear()` to avoid an unnecessary redraw.
-        this.discussions = [];
-        this.parseResults(results);
-      },
-      () => {
-        this.loading = false;
-        m.redraw();
-      }
-    );
+    return this.pagination.refresh(Number(m.route.param('page')) || 1).then(this.parse.bind(this));
   }
 
-  /**
-   * Load a new page of discussion results.
-   *
-   * @param offset The index to start the page at.
-   */
-  loadResults(offset) {
+  load(page) {
     const preloadedDiscussions = this.app.preloadedApiDocument();
 
     if (preloadedDiscussions) {
@@ -116,44 +103,54 @@ export default class DiscussionListState {
     }
 
     const params = this.requestParams();
-    params.page = { offset };
+    params.page = { offset: DiscussionListState.DISCUSSIONS_PER_PAGE * (page - 1) };
     params.include = params.include.join(',');
 
     return this.app.store.find('discussions', params);
   }
 
-  /**
-   * Load the next page of discussion results.
-   */
-  loadMore() {
-    this.loading = true;
+  loadPrev() {
+    return this.pagination.loadPrev().then(this.parse.bind(this));
+  }
 
-    this.loadResults(this.discussions.length).then(this.parseResults.bind(this));
+  loadMore() {
+    return this.pagination.loadNext().then(this.parse.bind(this));
   }
 
   /**
    * Parse results and append them to the discussion list.
    */
-  parseResults(results) {
-    this.discussions.push(...results);
+  parse() {
+    const discussions = [];
+    const { first, last } = this.pagination.pages;
 
-    this.loading = false;
-    this.moreResults = !!results.payload.links && !!results.payload.links.next;
+    for (let page = first; page <= last; page++) {
+      const results = this.pagination.data[page];
+
+      if (Array.isArray(results)) discussions.push(...results);
+    }
+
+    this.discussions = discussions;
+
+    const results = this.pagination.data[last];
+    this.moreResults = !!results.payload.links.next;
 
     m.redraw();
 
-    return results;
+    return discussions;
   }
 
   /**
    * Remove a discussion from the list if it is present.
    */
   removeDiscussion(discussion) {
-    const index = this.discussions.indexOf(discussion);
+    Object.keys(this.pagination.data).forEach((key) => {
+      const index = this.pagination.data[key].indexOf(discussion);
 
-    if (index !== -1) {
-      this.discussions.splice(index, 1);
-    }
+      this.pagination.data[key].splice(index, 1);
+    });
+
+    this.parse();
 
     m.redraw();
   }
@@ -177,7 +174,11 @@ export default class DiscussionListState {
    * Are discussions currently being loaded?
    */
   isLoading() {
-    return this.loading;
+    return this.pagination.loading.next;
+  }
+
+  isLoadingPrev() {
+    return this.pagination.loading.prev;
   }
 
   /**

js/src/forum/states/PostStreamState.js

@@ -96,7 +96,9 @@ class PostStreamState {
     // If we want to go to the reply preview, then we will go to the end of the
     // discussion and then scroll to the very bottom of the page.
     if (number === 'reply') {
-      return this.goToLast();
+      const resultPromise = this.goToLast();
+      this.targetPost.reply = true;
+      return resultPromise;
     }
 
     this.paused = true;
@@ -170,7 +172,7 @@ class PostStreamState {
    * @return {Promise}
    */
   loadNearIndex(index) {
-    if (index >= this.visibleStart && index <= this.visibleEnd) {
+    if (index >= this.visibleStart && index < this.visibleEnd) {
       return Promise.resolve();
     }
 
@@ -236,23 +238,26 @@ class PostStreamState {
    * @param {Boolean} backwards
    */
   loadPage(start, end, backwards = false) {
-    m.redraw();
+    this.pagesLoading++;
+
+    const redraw = () => {
+      if (start < this.visibleStart || end > this.visibleEnd) return;
+
+      const anchorIndex = backwards ? this.visibleEnd - 1 : this.visibleStart;
+      anchorScroll(`.PostStream-item[data-index="${anchorIndex}"]`, m.redraw.sync);
+    };
+    redraw();
 
     this.loadPageTimeouts[start] = setTimeout(
       () => {
         this.loadRange(start, end).then(() => {
-          if (start >= this.visibleStart && end <= this.visibleEnd) {
-            const anchorIndex = backwards ? this.visibleEnd - 1 : this.visibleStart;
-            anchorScroll(`.PostStream-item[data-index="${anchorIndex}"]`, () => m.redraw.sync());
-          }
+          redraw();
           this.pagesLoading--;
         });
         this.loadPageTimeouts[start] = null;
       },
-      this.pagesLoading ? 1000 : 0
+      this.pagesLoading - 1 ? 1000 : 0
     );
-
-    this.pagesLoading++;
   }
 
   /**
@@ -280,7 +285,13 @@ class PostStreamState {
         }
       });
 
-    return loadIds.length ? app.store.find('posts', loadIds) : Promise.resolve(loaded);
+    if (loadIds.length) {
+      return app.store.find('posts', loadIds).then((newPosts) => {
+        return loaded.concat(newPosts).sort((a, b) => a.createdAt() - b.createdAt());
+      });
+    }
+
+    return Promise.resolve(loaded);
   }
 
   /**

js/tsconfig.json

@@ -1,5 +1,5 @@
 {
-  "include": ["src/**/*.ts"],
+  "include": ["src/**/*.ts", "src/**/*.tsx"],
   "files": ["shims.d.ts"],
   "compilerOptions": {
     "allowUmdGlobalAccess": true,

less/admin.less

@@ -1,10 +1,12 @@
 @import "common/common";
 
+@import "admin/AdminHeader";
 @import "admin/AdminNav";
 @import "admin/DashboardPage";
 @import "admin/BasicsPage";
 @import "admin/PermissionsPage";
 @import "admin/EditGroupModal";
-@import "admin/ExtensionsPage";
+@import "admin/ExtensionPage";
+@import "admin/ExtensionWidget";
 @import "admin/AppearancePage";
 @import "admin/MailPage";

less/admin/AdminHeader.less

@@ -0,0 +1,20 @@
+.AdminHeader {
+  background: @control-bg;
+  margin-bottom: 20px;
+  padding: 20px 0;
+
+  h2 {
+    margin-top: 0;
+    margin-bottom: 10px;
+    color: @muted-color;
+  }
+
+  .AdminHeader-description {
+    margin: 0;
+    color: @control-color;
+  }
+
+  .icon {
+    margin-right: 15px;
+  }
+}

less/admin/AdminNav.less

@@ -1,18 +1,83 @@
-@admin-pane-width: 300px;
+@admin-pane-width: 250px;
 
 .App {
   padding-bottom: 0;
 }
-.AdminLinkButton-description {
-  display: none;
-}
+
 .AdminContent {
   padding: 20px 0;
 }
 .App-content .sideNavOffset {
   margin-top: 0;
 }
-@media @desktop, @desktop-hd {
+
+.Header-controls {
+  > li {
+    margin-left: 10px;
+  }
+}
+
+@media @phone {
+  .Dropdown-menu {
+    height: 70vh;
+
+    .item-search {
+      margin: 10px;
+
+      .SearchBar {
+        width: 100%
+      }
+    }
+  }
+
+  .ExtensionNavButton {
+    .Button-label {
+      margin-left: 30px;
+    }
+    .ExtensionIcon {
+      margin: 0 0 0 -4px !important;
+    }
+  }
+}
+
+@media @tablet {
+  .AdminNav {
+    .item-search,
+    li[class^="item-category"],
+    li[class^="item-extension"],
+    .AdminLinkButton-description {
+      display: none !important;
+    }
+  }
+}
+
+@media @phone, @tablet {
+  .App-nav .AdminNav {
+    .Dropdown-menu {
+      > li {
+        .ExtensionListTitle {
+          color: @muted-color;
+          text-transform: uppercase;
+          margin: 25px 0 10px 15px;
+        }
+
+        .ExtensionIcon {
+          margin: -2px -29px;
+          width: 25px;
+          height: 25px;
+          font-size: 12.5px;
+
+          .icon {
+            margin: 0;
+          }
+        }
+      }
+    }
+  }
+}
+
+
+@media @desktop-up {
   .App-nav {
     position: absolute;
     top: @header-height;
@@ -20,60 +85,95 @@
     width: @admin-pane-width;
     .box-shadow(0 6px 6px @shadow-color);
     background: @body-bg;
-    border-top: 1px solid @control-bg;
     z-index: @zindex-pane;
-    overflow: auto;
+    overflow-y: scroll;
+    padding-bottom: 40px;
 
     .affix & {
       position: fixed;
       bottom: 0;
-      height: auto;
     }
   }
   .App-content .sideNavOffset {
     margin-left: @admin-pane-width;
   }
   .App-nav .AdminNav {
-    .Dropdown-menu > li {
-      > a {
-        padding: 15px 15px 15px 45px;
-        display: block;
-        text-decoration: none;
-        white-space: normal;
+    .Dropdown-menu {
+      .item-search {
+        margin-top: 10px;
+        margin-bottom: 20px;
       }
-      > a, > a:hover, &.active > a {
-        color: @muted-color;
-      }
-      > a:hover {
-        background: @control-bg;
-      }
-      &.active > a {
-        background: @control-bg;
-        font-weight: normal;
 
-        .Button-label, .Button-icon {
+      .item-category-core {
+        > .ExtensionListTitle {
+          margin-top: 10px;
+        }
+      }
+
+      > li {
+        > a {
+          padding: 10px 10px 10px 45px;
+          display: block;
+          text-decoration: none;
+        }
+
+        > a,
+        > a:hover,
+        &.active > a {
           color: @text-color;
-          font-weight: bold;
+        }
+
+        > a:hover {
+          background: @control-bg;
+        }
+
+        &.active > a {
+          background: @control-color;
+          font-weight: normal;
+          color: @body-bg;
+
+          .Button-label,
+          .Button-icon {
+            font-weight: bold;
+          }
+        }
+
+        .Button-icon {
+          float: left;
+          font-size: 13px !important;
+          margin-left: -25px !important;
+          margin-top: 4px !important;
+        }
+
+        .Button-label {
+          padding-left: 5px;
+          font-size: 14px;
+          font-weight: normal;
+        }
+
+        .Search-input,
+        .SearchBar {
+          max-width: 215px;
+          margin: 0 auto;
+        }
+
+        .ExtensionListTitle {
+          color: @muted-color;
+          text-transform: uppercase;
+          margin: 25px 0 8px 15px;
+        }
+
+        .ExtensionIcon {
+          width: 25px;
+          height: 25px;
+          font-size: 15px;
+          margin-left: -29px;
+          vertical-align: middle;
         }
       }
     }
-    .Button-icon {
-      float: left;
-      margin-left: -30px;
-      font-size: 14px;
-      margin-top: 4px !important;
-    }
-    .Button-label {
-      display: block;
-      font-size: 15px;
-      font-weight: normal;
-      margin: 0 0 5px;
-    }
-    .AdminLinkButton-description {
-      display: block;
-      font-size: 12px;
-    }
   }
+
   .container {
     width: 100%;
     margin: 0;
@@ -85,4 +185,38 @@
       padding: 0;
     }
   }
+
+}
+
+.AdminLinkButton-description {
+  white-space: normal;
+  padding-left: 5px;
+}
+
+.ExtensionListItem-Dot {
+  height: 10px;
+  width: 10px;
+  border-radius: 50%;
+  display: inline-block;
+  right: 13px;
+  margin: 6px 5px;
+  position: absolute;
+}
+
+.ExtensionNavButton {
+  .Button-label {
+    display: inline-block;
+    max-width: calc(100% - 18px);
+    overflow: hidden;
+    text-overflow: ellipsis;
+    vertical-align: middle;
+    margin-left: 5px;
+  }
+}
+
+.ExtensionListItem-Dot.enabled {
+  background-color: #2ECC40;
+}
+.ExtensionListItem-Dot.disabled {
+  background-color: #FF4136;
 }

less/admin/AppearancePage.less

@@ -1,8 +1,8 @@
 .AppearancePage {
+
   @media @desktop-up {
     .container {
       max-width: 600px;
-      padding: 30px;
       margin: 0;
     }
   }

less/admin/BasicsPage.less

@@ -1,5 +1,4 @@
 .BasicsPage {
-  padding: 20px 0;
 
   @media @desktop-up {
     .container {

less/admin/DashboardPage.less

@@ -1,33 +1,30 @@
 .DashboardPage {
-  background: @control-bg;
+  background: @body-bg;
   color: @control-color;
   min-height: 100vh;
-
-  @media @desktop-up {
-    .container {
-      padding: 30px;
-      margin: 0;
-    }
-  }
 }
 
-.DashboardWidget {
-  background: @body-bg;
+.Widget {
+  background: @control-bg;
   color: @text-color;
   border-radius: @border-radius;
   padding: 20px;
   margin-bottom: 20px;
+
+  .Button {
+    .Button--color(@control-color, @body-bg)
+  }
 }
 
 .StatusWidget {
   color: @muted-color;
 
-  > ul {
+  >ul {
     margin: 0;
     padding: 0;
     list-style-type: none;
 
-    > li {
+    >li {
       display: inline-block;
       margin-right: 30px;
       vertical-align: middle;
@@ -38,6 +35,7 @@
         overflow: hidden;
         text-overflow: ellipsis;
       }
+
       &.item-tools {
         float: right;
         margin-right: 0;

less/admin/ExtensionPage.less

@@ -0,0 +1,157 @@
+.ExtensionPage {
+  min-height: 110vh;
+
+  .ExtensionPage-header {
+    .ExtensionTitle {
+      display: flex;
+      align-items: center;
+      flex-wrap: wrap;
+      margin: 20px 0 15px;
+    }
+
+    .helpText {
+      margin-bottom: 5px;
+    }
+
+    h2 {
+      display: inline-block;
+      margin: 0;
+      vertical-align: middle;
+    }
+  }
+
+  .ExtensionPage-header,
+  .ExtensionPage-permissions-header {
+    background: @control-bg;
+
+    h2 {
+      color: @muted-color;
+
+      span {
+        font-size: 13px;
+        color: @muted-color;
+        font-weight: normal;
+      }
+    }
+
+    .Button-icon {
+      display: unset;
+    }
+
+    ul {
+      display: flex;
+      align-items: center;
+      list-style-type: none;
+      padding: 0;
+      margin: 0;
+
+      > li {
+        display: inline;
+        color: @muted-color;
+        margin-left: 13px;
+
+
+        > a {
+          color: @muted-color;
+        }
+
+        > .icon {
+          margin-right: 5px;
+        }
+      }
+    }
+
+    .ExtensionPage-headerItems {
+      padding: 15px 0;
+      display: flex;
+      align-items: center;
+      flex-wrap: wrap;
+
+      .Checkbox {
+        margin: 5px 0 0 0;
+        display: inline-block;
+      }
+    }
+
+    .Checkbox.off {
+      .Checkbox-display {
+        background: @muted-more-color;
+      }
+    }
+
+    .ExtensionInfo {
+      margin-left: auto;
+
+      .item-authors {
+        a {
+          color: @muted-color;
+        }
+      }
+    }
+
+
+    .ExtensionName {
+      display: inline-block;
+      margin-left: 8px;
+    }
+
+    .ExtensionIcon {
+      width: 30px;
+      height: 30px;
+      font-size: 15px;
+      margin-left: 0;
+      vertical-align: middle;
+    }
+
+    .ExtensionPage-headerTopItems {
+      margin-left: auto;
+    }
+
+    @media (max-width: @screen-phone-max) {
+      .ExtensionPage-headerTopItems {
+        float: right;
+        position: relative;
+      }
+
+      .item-website, .item-source, .item-documentation {
+        display: none;
+      }
+    }
+  }
+
+  .ExtensionPage-settings, .ExtensionPage-permissions {
+    .ExtensionPage-subHeader {
+      margin: 5px 0px;
+    }
+  }
+
+  .ExtensionPage-settings {
+    margin-top: 20px;
+    padding: 10px 0;
+
+    input {
+      max-width: 400px;
+    }
+  }
+
+  .ExtensionPage-subHeader {
+    color: @muted-color;
+    font-weight: normal;
+  }
+
+
+  .ExtensionPage-permissions {
+
+    @media @phone {
+      > .container {
+        overflow-x: scroll;
+        padding-bottom: 20px;
+      }
+    }
+
+    .ExtensionPage-permissions-header {
+      margin: 20px 0 20px;
+      padding: 5px 0;
+    }
+  }
+}

less/admin/ExtensionWidget.less

@@ -0,0 +1,91 @@
+.ExtensionsWidget {
+  background-color: @body-bg;
+  padding: 0;
+}
+
+.ExtensionsWidget-list {
+  padding: 0;
+  background-color: @body-bg;
+
+  .ExtensionList-Category {
+    background: @control-bg;
+    padding: 20px 0 20px 20px;
+    margin-bottom: 20px;
+    border-radius: @border-radius;
+
+    .ExtensionList-Label {
+      margin-top: 0;
+      color: @muted-color;
+    }
+  }
+
+  .ExtensionGroup {
+    margin-bottom: 20px;
+
+    h3 {
+      color: @muted-color;
+      text-transform: uppercase;
+      font-size: 12px;
+      margin: 0 0 10px;
+    }
+  }
+
+  .ExtensionList {
+    padding: 0;
+    list-style: none;
+    display: grid;
+    grid-gap: 10px;
+    grid-template-columns: repeat(auto-fit, 90px);
+    margin-bottom: 0;
+
+    > li {
+      text-align: left;
+      position: relative;
+      display: block;
+    }
+  }
+}
+
+.ExtensionListItem.disabled {
+  .ExtensionListItem-title {
+    opacity: 0.5;
+    color: @muted-color;
+  }
+
+  .ExtensionListItem-icon {
+    opacity: 0.5;
+  }
+}
+
+.ExtensionListItem {
+  transition: .15s ease-in-out;
+
+  &:hover {
+    transform: scale(1.05);
+  }
+
+  .ExtensionListItem-title {
+    display: block;
+    text-align: center;
+    margin-top: 5px;
+    color: @text-color;
+  }
+
+  a:hover {
+    text-decoration: none;
+  }
+}
+
+.ExtensionIcon {
+  width: 90px;
+  height: 90px;
+  background: @control-bg;
+  color: @control-color;
+  border-radius: 6px;
+  display: inline-flex;
+  font-size: 45px;
+  text-align: center;
+  align-items: center;
+  justify-content: center;
+  vertical-align: middle;
+}

less/admin/ExtensionsPage.less

@@ -1,115 +0,0 @@
-@extension-list-column-width: 410px;
-
-.ExtensionsPage-header {
-  padding: 20px 0;
-  background: @control-bg;
-}
-
-.ExtensionsPage-list {
-  padding: 30px 0;
-}
-.ExtensionGroup {
-  margin-bottom: 20px;
-
-  h3 {
-    color: @muted-color;
-    text-transform: uppercase;
-    font-size: 12px;
-    margin: 0 0 10px;
-  }
-}
-
-.ExtensionList {
-  columns: 3;
-  column-width: @extension-list-column-width;
-  margin: 0;
-  padding: 0;
-  list-style: none;
-  .clearfix();
-
-  > li {
-    -webkit-column-break-inside: avoid;
-    break-inside: avoid-column;
-    page-break-inside: avoid;
-    text-align: left;
-    position: relative;
-    border-radius: 4px;
-    transition: background .2s;
-  }
-}
-.ExtensionListItem.disabled {
-  .ExtensionListItem-title {
-    opacity: 0.5;
-    color: @muted-color;
-  }
-  .ExtensionListItem-icon {
-    opacity: 0.5;
-  }
-}
-.ExtensionListItem {
-  padding: 10px;
-}
-.ExtensionListItem:hover {
-  background: @control-bg;
-}
-.ExtensionListItem-content {
-  padding: 0 50px;
-  min-height: 40px;
-}
-.ExtensionListItem-main {
-  overflow: hidden;
-  text-overflow: ellipsis;
-}
-.ExtensionListItem-title {
-  display: inline-block;
-  font-size: 13px;
-  font-weight: bold;
-  white-space: nowrap;
-  cursor: pointer;
-  padding-right: 10px;
-}
-.ExtensionListItem-version {
-  color: @muted-more-color;
-  font-size: 11px;
-  font-weight: normal;
-  display: inline-flex;
-}
-.ExtensionListItem-controls {
-  float: right;
-  display: none;
-  margin-right: -50px;
-  margin-top: 1px;
-
-  .ExtensionListItem:hover &, &.open {
-    display: block;
-  }
-}
-.ExtensionListItem-description {
-  font-size: 11px;
-  font-weight: normal;
-  text-align: justify;
-}
-
-.ExtensionIcon {
-  width: 40px;
-  height: 40px;
-  background: @control-bg;
-  color: @control-color;
-  border-radius: 6px;
-  display: inline-block;
-  font-size: 20px;
-  line-height: 40px;
-  text-align: center;
-  margin-left: -50px;
-  position: absolute;
-}
-
-@media (max-width: @extension-list-column-width) {
-  .ExtensionListItem-description {
-    display: none;
-  }
-  .ExtensionListItem-version {
-    display: block;
-    margin-top: 8px;
-  }
-}

less/admin/MailPage.less

@@ -1,5 +1,4 @@
 .MailPage {
-  padding: 20px 0;
 
   @media @desktop-up {
     .container {

less/admin/PermissionsPage.less

@@ -1,6 +1,15 @@
 .PermissionsPage-groups {
   background: @control-bg;
-  padding: 20px 0;
+  border-radius: @border-radius;
+  max-width: calc(~'100% - 60px');
+  display: block;
+  margin-left: 30px;
+  overflow-x: auto;
+  padding: 10px 0 8px;
+
+  > .container {
+    padding: 0 10px;
+  }
 }
 .Group {
   width: 90px;
@@ -37,6 +46,7 @@
 
 .PermissionGrid {
   white-space: nowrap;
+  padding-left: 0 12px;
 
   td, th {
     padding: 5px;
@@ -112,7 +122,7 @@
 }
 .PermissionGrid-section {
   td, th {
-    padding-top: 20px;
+    padding-top: 10px;
   }
 }
 .PermissionGrid-child {

less/common/App.less

@@ -10,29 +10,23 @@
   }
 }
 
-// Fix a solid white box to the top of the viewport. This toolbar's contents
-// will differ depending on the device: on phones it will be content
-// controls, whereas on desktops it will be the header. We will overlay
-// these things on top of it later.
-.App:before {
-  content: " ";
-  .header-background();
-  border-bottom: 0;
-  position: absolute;
-
-  .affix& {
-    position: fixed;
-  }
-
-  .scrolled& {
-    .box-shadow(0 2px 6px @shadow-color);
-  }
-}
-
 // PHONES: Somewhere on the page there will be a .App-backControl, a
 // .App-primaryControl, and a .App-titleControl. We will position these on the
 // left, right, and center of the header respectively.
 @media @phone {
+  .App-navigation {
+    .header-background();
+    border-bottom: 0;
+    position: absolute;
+
+    .affix & {
+      position: fixed;
+    }
+
+    .scrolled & {
+      .box-shadow(0 2px 6px @shadow-color);
+    }
+  }
   .App-primaryControl, .App-titleControl, .App-backControl {
     position: absolute !important;
     z-index: @zindex-header + 1;
@@ -234,13 +228,18 @@
     display: none;
   }
   .App-header {
+    .header-background();
     padding: 8px;
-    height: @header-height;
-    position: fixed;
-    top: 0;
-    left: 0;
-    right: 0;
-    z-index: @zindex-header;
+    position: absolute;
+    border-bottom: 0;
+
+    .affix & {
+      position: fixed;
+    }
+
+    .scrolled & {
+      .box-shadow(0 2px 6px @shadow-color);
+    }
 
     & when (@config-colored-header = true) {
       .light-contents(@header-color, @header-control-bg, @header-control-color);

less/common/Modal.less

@@ -105,6 +105,10 @@
       text-align: left;
     }
   }
+
+  .off.Checkbox--switch .Checkbox-display {
+    background: @muted-more-color;
+  }
 }
 .Modal-footer {
   border: 0;

less/common/mixins/header-background.less

@@ -6,7 +6,6 @@
   right: 0;
   z-index: @zindex-header;
   border-bottom: 1px solid @control-bg;
-  .translate3d(0, 0, 0);
   .transition(~"box-shadow 0.2s, -webkit-transform 0.2s");
 
   @media @phone {

less/forum/Composer.less

@@ -114,7 +114,7 @@
     background: @body-bg;
 
     &:not(.minimized) {
-      position: absolute;
+      position: fixed;
       top: 0;
       height: 350px !important;
       padding-top: @header-height-phone;
@@ -219,7 +219,6 @@
   .Composer {
     border-radius: @border-radius @border-radius 0 0;
     background: fade(@body-bg, 95%);
-    transform: translateZ(0); // Fix for Chrome bug where a transparent white background is actually gray
     position: relative;
     height: 300px;
     .transition(~"background 0.2s, box-shadow 0.2s");

less/forum/PostStream.less

@@ -6,18 +6,7 @@
     margin-top: 10px;
   }
 }
-
-@-webkit-keyframes fadeIn {
-  0% {opacity: 0}
-  100% {opacity: 1}
-}
-@keyframes fadeIn {
-  0% {opacity: 0}
-  100% {opacity: 1}
-}
 .PostStream-item {
-  .animation(fadeIn 0.4s ease-in-out);
-
   &:not(:last-child) {
     border-bottom: 1px solid @control-bg;
 
@@ -104,3 +93,16 @@
   .animation(pulsate 0.2s ease-in-out);
   .animation-iteration-count(1);
 }
+
+@-webkit-keyframes fadeIn {
+  0% {opacity: 0}
+  100% {opacity: 1}
+}
+@keyframes fadeIn {
+  0% {opacity: 0}
+  100% {opacity: 1}
+}
+.fadeIn {
+  .animation(fadeIn 0.4s ease-in-out);
+  .animation-iteration-count(1);
+}

less/forum/Slidable.less

@@ -44,7 +44,7 @@
 
       .sliding& {
         position: relative;
-        background: #fff;
+        background: @control-bg;
         z-index: 2;
         border-radius: 2px;
         .box-shadow(0 2px 6px @shadow-color);

src/Admin/AdminServiceProvider.php

@@ -54,9 +54,10 @@ class AdminServiceProvider extends AbstractServiceProvider
                 HttpMiddleware\StartSession::class,
                 HttpMiddleware\RememberFromCookie::class,
                 HttpMiddleware\AuthenticateWithSession::class,
-                HttpMiddleware\CheckCsrfToken::class,
                 HttpMiddleware\SetLocale::class,
-                Middleware\RequireAdministrateAbility::class,
+                'flarum.admin.route_resolver',
+                HttpMiddleware\CheckCsrfToken::class,
+                Middleware\RequireAdministrateAbility::class
             ];
         });
 
@@ -68,6 +69,10 @@ class AdminServiceProvider extends AbstractServiceProvider
             );
         });
 
+        $this->app->bind('flarum.admin.route_resolver', function () {
+            return new HttpMiddleware\ResolveRoute($this->app->make('flarum.admin.routes'));
+        });
+
         $this->app->singleton('flarum.admin.handler', function () {
             $pipe = new MiddlewarePipe;
 
@@ -75,7 +80,7 @@ class AdminServiceProvider extends AbstractServiceProvider
                 $pipe->pipe($this->app->make($middleware));
             }
 
-            $pipe->pipe(new HttpMiddleware\DispatchRoute($this->app->make('flarum.admin.routes')));
+            $pipe->pipe(new HttpMiddleware\ExecuteRoute());
 
             return $pipe;
         });

src/Admin/Content/AdminPayload.php

@@ -75,6 +75,9 @@ class AdminPayload
         $document->payload['extensions'] = $this->extensions->getExtensions()->toArray();
 
         $document->payload['displayNameDrivers'] = array_keys($this->container->make('flarum.user.display_name.supported_drivers'));
+        $document->payload['slugDrivers'] = array_map(function ($resourceDrivers) {
+            return array_keys($resourceDrivers);
+        }, $this->container->make('flarum.http.slugDrivers'));
 
         $document->payload['phpVersion'] = PHP_VERSION;
         $document->payload['mysqlVersion'] = $this->db->selectOne('select version() as version')->version;

src/Api/ApiServiceProvider.php

@@ -42,6 +42,20 @@ class ApiServiceProvider extends AbstractServiceProvider
             return $routes;
         });
 
+        $this->app->singleton('flarum.api.throttlers', function () {
+            return [
+                'bypassThrottlingAttribute' => function ($request) {
+                    if ($request->getAttribute('bypassThrottling')) {
+                        return false;
+                    }
+                }
+            ];
+        });
+
+        $this->app->bind(Middleware\ThrottleApi::class, function ($app) {
+            return new Middleware\ThrottleApi($app->make('flarum.api.throttlers'));
+        });
+
         $this->app->singleton('flarum.api.middleware', function () {
             return [
                 'flarum.api.error_handler',
@@ -51,8 +65,10 @@ class ApiServiceProvider extends AbstractServiceProvider
                 HttpMiddleware\RememberFromCookie::class,
                 HttpMiddleware\AuthenticateWithSession::class,
                 HttpMiddleware\AuthenticateWithHeader::class,
-                HttpMiddleware\CheckCsrfToken::class,
                 HttpMiddleware\SetLocale::class,
+                'flarum.api.route_resolver',
+                HttpMiddleware\CheckCsrfToken::class,
+                Middleware\ThrottleApi::class
             ];
         });
 
@@ -64,6 +80,10 @@ class ApiServiceProvider extends AbstractServiceProvider
             );
         });
 
+        $this->app->bind('flarum.api.route_resolver', function () {
+            return new HttpMiddleware\ResolveRoute($this->app->make('flarum.api.routes'));
+        });
+
         $this->app->singleton('flarum.api.handler', function () {
             $pipe = new MiddlewarePipe;
 
@@ -71,10 +91,16 @@ class ApiServiceProvider extends AbstractServiceProvider
                 $pipe->pipe($this->app->make($middleware));
             }
 
-            $pipe->pipe(new HttpMiddleware\DispatchRoute($this->app->make('flarum.api.routes')));
+            $pipe->pipe(new HttpMiddleware\ExecuteRoute());
 
             return $pipe;
         });
+
+        $this->app->singleton('flarum.api.notification_serializers', function () {
+            return [
+                'discussionRenamed' => BasicDiscussionSerializer::class
+            ];
+        });
     }
 
     /**
@@ -82,7 +108,7 @@ class ApiServiceProvider extends AbstractServiceProvider
      */
     public function boot()
     {
-        $this->registerNotificationSerializers();
+        $this->setNotificationSerializers();
 
         AbstractSerializeController::setContainer($this->app);
         AbstractSerializeController::setEventDispatcher($events = $this->app->make('events'));
@@ -94,13 +120,12 @@ class ApiServiceProvider extends AbstractServiceProvider
     /**
      * Register notification serializers.
      */
-    protected function registerNotificationSerializers()
+    protected function setNotificationSerializers()
     {
         $blueprints = [];
-        $serializers = [
-            'discussionRenamed' => BasicDiscussionSerializer::class
-        ];
+        $serializers = $this->app->make('flarum.api.notification_serializers');
 
+        // Deprecated in beta 15, remove in beta 16
         $this->app->make('events')->dispatch(
             new ConfigureNotificationTypes($blueprints, $serializers)
         );

src/Api/Controller/AbstractSerializeController.php

@@ -82,6 +82,16 @@ abstract class AbstractSerializeController implements RequestHandlerInterface
      */
     protected static $events;
 
+    /**
+     * @var array
+     */
+    protected static $beforeDataCallbacks = [];
+
+    /**
+     * @var array
+     */
+    protected static $beforeSerializationCallbacks = [];
+
     /**
      * {@inheritdoc}
      */
@@ -89,12 +99,30 @@ abstract class AbstractSerializeController implements RequestHandlerInterface
     {
         $document = new Document;
 
+        foreach (array_reverse(array_merge([static::class], class_parents($this))) as $class) {
+            if (isset(static::$beforeDataCallbacks[$class])) {
+                foreach (static::$beforeDataCallbacks[$class] as $callback) {
+                    $callback($this);
+                }
+            }
+        }
+
+        // Deprected in beta 15, removed in beta 16
         static::$events->dispatch(
             new WillGetData($this)
         );
 
         $data = $this->data($request, $document);
 
+        foreach (array_reverse(array_merge([static::class], class_parents($this))) as $class) {
+            if (isset(static::$beforeSerializationCallbacks[$class])) {
+                foreach (static::$beforeSerializationCallbacks[$class] as $callback) {
+                    $callback($this, $data, $request, $document);
+                }
+            }
+        }
+
+        // Deprecated in beta 15, removed in beta 16
         static::$events->dispatch(
             new WillSerializeData($this, $data, $request, $document)
         );
@@ -197,6 +225,106 @@ abstract class AbstractSerializeController implements RequestHandlerInterface
         return new Parameters($request->getQueryParams());
     }
 
+    /**
+     * Set the serializer that will serialize data for the endpoint.
+     *
+     * @param string $serializer
+     */
+    public function setSerializer(string $serializer)
+    {
+        $this->serializer = $serializer;
+    }
+
+    /**
+     * Include the given relationship by default.
+     *
+     * @param string|array $name
+     */
+    public function addInclude($name)
+    {
+        $this->include = array_merge($this->include, (array) $name);
+    }
+
+    /**
+     * Don't include the given relationship by default.
+     *
+     * @param string|array $name
+     */
+    public function removeInclude($name)
+    {
+        $this->include = array_diff($this->include, (array) $name);
+    }
+
+    /**
+     * Make the given relationship available for inclusion.
+     *
+     * @param string|array $name
+     */
+    public function addOptionalInclude($name)
+    {
+        $this->optionalInclude = array_merge($this->optionalInclude, (array) $name);
+    }
+
+    /**
+     * Don't allow the given relationship to be included.
+     *
+     * @param string|array $name
+     */
+    public function removeOptionalInclude($name)
+    {
+        $this->optionalInclude = array_diff($this->optionalInclude, (array) $name);
+    }
+
+    /**
+     * Set the default number of results.
+     *
+     * @param int $limit
+     */
+    public function setLimit(int $limit)
+    {
+        $this->limit = $limit;
+    }
+
+    /**
+     * Set the maximum number of results.
+     *
+     * @param int $max
+     */
+    public function setMaxLimit(int $max)
+    {
+        $this->maxLimit = $max;
+    }
+
+    /**
+     * Allow sorting results by the given field.
+     *
+     * @param string|array $field
+     */
+    public function addSortField($field)
+    {
+        $this->sortFields = array_merge($this->sortFields, (array) $field);
+    }
+
+    /**
+     * Disallow sorting results by the given field.
+     *
+     * @param string|array $field
+     */
+    public function removeSortField($field)
+    {
+        $this->sortFields = array_diff($this->sortFields, (array) $field);
+    }
+
+    /**
+     * Set the default sort order for the results.
+     *
+     * @param array $sort
+     */
+    public function setSort(array $sort)
+    {
+        $this->sort = $sort;
+    }
+
     /**
      * @return Dispatcher
      */
@@ -228,4 +356,30 @@ abstract class AbstractSerializeController implements RequestHandlerInterface
     {
         static::$container = $container;
     }
+
+    /**
+     * @param string $controllerClass
+     * @param callable $callback
+     */
+    public static function addDataPreparationCallback(string $controllerClass, callable $callback)
+    {
+        if (! isset(static::$beforeDataCallbacks[$controllerClass])) {
+            static::$beforeDataCallbacks[$controllerClass] = [];
+        }
+
+        static::$beforeDataCallbacks[$controllerClass][] = $callback;
+    }
+
+    /**
+     * @param string $controllerClass
+     * @param callable $callback
+     */
+    public static function addSerializationPreparationCallback(string $controllerClass, callable $callback)
+    {
+        if (! isset(static::$beforeSerializationCallbacks[$controllerClass])) {
+            static::$beforeSerializationCallbacks[$controllerClass] = [];
+        }
+
+        static::$beforeSerializationCallbacks[$controllerClass][] = $callback;
+    }
 }

src/Api/Controller/CreateDiscussionController.php

@@ -64,6 +64,9 @@ class CreateDiscussionController extends AbstractCreateController
         $actor = $request->getAttribute('actor');
         $ipAddress = Arr::get($request->getServerParams(), 'REMOTE_ADDR', '127.0.0.1');
 
+        /**
+         * @deprecated, remove in beta 15.
+         */
         if (! $request->getAttribute('bypassFloodgate')) {
             $this->floodgate->assertNotFlooding($actor);
         }

src/Api/Controller/CreatePostController.php

@@ -65,6 +65,9 @@ class CreatePostController extends AbstractCreateController
         $discussionId = Arr::get($data, 'relationships.discussion.data.id');
         $ipAddress = Arr::get($request->getServerParams(), 'REMOTE_ADDR', '127.0.0.1');
 
+        /**
+         * @deprecated, remove in beta 15.
+         */
         if (! $request->getAttribute('bypassFloodgate')) {
             $this->floodgate->assertNotFlooding($actor);
         }

src/Api/Controller/ShowDiscussionController.php

@@ -12,6 +12,7 @@ namespace Flarum\Api\Controller;
 use Flarum\Api\Serializer\DiscussionSerializer;
 use Flarum\Discussion\Discussion;
 use Flarum\Discussion\DiscussionRepository;
+use Flarum\Http\SlugManager;
 use Flarum\Post\PostRepository;
 use Flarum\User\User;
 use Illuminate\Support\Arr;
@@ -31,6 +32,11 @@ class ShowDiscussionController extends AbstractShowController
      */
     protected $posts;
 
+    /**
+     * @var SlugManager
+     */
+    protected $slugManager;
+
     /**
      * {@inheritdoc}
      */
@@ -61,11 +67,13 @@ class ShowDiscussionController extends AbstractShowController
     /**
      * @param \Flarum\Discussion\DiscussionRepository $discussions
      * @param \Flarum\Post\PostRepository $posts
+     * @param \Flarum\Http\SlugManager $slugManager
      */
-    public function __construct(DiscussionRepository $discussions, PostRepository $posts)
+    public function __construct(DiscussionRepository $discussions, PostRepository $posts, SlugManager $slugManager)
     {
         $this->discussions = $discussions;
         $this->posts = $posts;
+        $this->slugManager = $slugManager;
     }
 
     /**
@@ -77,7 +85,11 @@ class ShowDiscussionController extends AbstractShowController
         $actor = $request->getAttribute('actor');
         $include = $this->extractInclude($request);
 
-        $discussion = $this->discussions->findOrFail($discussionId, $actor);
+        if (Arr::get($request->getQueryParams(), 'bySlug', false)) {
+            $discussion = $this->slugManager->forResource(Discussion::class)->fromSlug($discussionId, $actor);
+        } else {
+            $discussion = $this->discussions->findOrFail($discussionId, $actor);
+        }
 
         if (in_array('posts', $include)) {
             $postRelationships = $this->getPostRelationships($include);

src/Api/Controller/ShowUserController.php

@@ -11,6 +11,8 @@ namespace Flarum\Api\Controller;
 
 use Flarum\Api\Serializer\CurrentUserSerializer;
 use Flarum\Api\Serializer\UserSerializer;
+use Flarum\Http\SlugManager;
+use Flarum\User\User;
 use Flarum\User\UserRepository;
 use Illuminate\Support\Arr;
 use Psr\Http\Message\ServerRequestInterface;
@@ -29,15 +31,22 @@ class ShowUserController extends AbstractShowController
     public $include = ['groups'];
 
     /**
-     * @var \Flarum\User\UserRepository
+     * @var SlugManager
+     */
+    protected $slugManager;
+
+    /**
+     * @var UserRepository
      */
     protected $users;
 
     /**
-     * @param \Flarum\User\UserRepository $users
+     * @param SlugManager $slugManager
+     * @param UserRepository $users
      */
-    public function __construct(UserRepository $users)
+    public function __construct(SlugManager $slugManager, UserRepository $users)
     {
+        $this->slugManager = $slugManager;
         $this->users = $users;
     }
 
@@ -47,17 +56,18 @@ class ShowUserController extends AbstractShowController
     protected function data(ServerRequestInterface $request, Document $document)
     {
         $id = Arr::get($request->getQueryParams(), 'id');
-
-        if (! is_numeric($id)) {
-            $id = $this->users->getIdForUsername($id);
-        }
-
         $actor = $request->getAttribute('actor');
 
-        if ($actor->id == $id) {
+        if (Arr::get($request->getQueryParams(), 'bySlug', false)) {
+            $user = $this->slugManager->forResource(User::class)->fromSlug($id, $actor);
+        } else {
+            $user = $this->users->findOrFail($id, $actor);
+        }
+
+        if ($actor->id === $user->id) {
             $this->serializer = CurrentUserSerializer::class;
         }
 
-        return $this->users->findOrFail($id, $actor);
+        return $user;
     }
 }

src/Api/Controller/UploadFaviconController.php

@@ -9,69 +9,36 @@
 
 namespace Flarum\Api\Controller;
 
-use Flarum\Settings\SettingsRepositoryInterface;
-use Illuminate\Support\Arr;
-use Illuminate\Support\Str;
+use Intervention\Image\Image;
 use Intervention\Image\ImageManager;
-use League\Flysystem\FilesystemInterface;
-use Psr\Http\Message\ServerRequestInterface;
-use Tobscure\JsonApi\Document;
+use Psr\Http\Message\UploadedFileInterface;
 
-class UploadFaviconController extends ShowForumController
+class UploadFaviconController extends UploadImageController
 {
-    /**
-     * @var SettingsRepositoryInterface
-     */
-    protected $settings;
+    protected $filePathSettingKey = 'favicon_path';
 
-    /**
-     * @var FilesystemInterface
-     */
-    protected $uploadDir;
-
-    /**
-     * @param SettingsRepositoryInterface $settings
-     * @param FilesystemInterface $uploadDir
-     */
-    public function __construct(SettingsRepositoryInterface $settings, FilesystemInterface $uploadDir)
-    {
-        $this->settings = $settings;
-        $this->uploadDir = $uploadDir;
-    }
+    protected $filenamePrefix = 'favicon';
 
     /**
      * {@inheritdoc}
      */
-    public function data(ServerRequestInterface $request, Document $document)
+    protected function makeImage(UploadedFileInterface $file): Image
     {
-        $request->getAttribute('actor')->assertAdmin();
+        $this->fileExtension = pathinfo($file->getClientFilename(), PATHINFO_EXTENSION);
 
-        $file = Arr::get($request->getUploadedFiles(), 'favicon');
-        $extension = pathinfo($file->getClientFilename(), PATHINFO_EXTENSION);
-
-        if ($extension === 'ico') {
-            $image = $file->getStream();
+        if ($this->fileExtension === 'ico') {
+            $encodedImage = $file->getStream();
         } else {
-            $manager = new ImageManager;
+            $manager = new ImageManager();
 
-            $image = $manager->make($file->getStream())->resize(64, 64, function ($constraint) {
+            $encodedImage = $manager->make($file->getStream())->resize(64, 64, function ($constraint) {
                 $constraint->aspectRatio();
                 $constraint->upsize();
             })->encode('png');
 
-            $extension = 'png';
+            $this->fileExtension = 'png';
         }
 
-        if (($path = $this->settings->get('favicon_path')) && $this->uploadDir->has($path)) {
-            $this->uploadDir->delete($path);
-        }
-
-        $uploadName = 'favicon-'.Str::lower(Str::random(8)).'.'.$extension;
-
-        $this->uploadDir->write($uploadName, $image);
-
-        $this->settings->set('favicon_path', $uploadName);
-
-        return parent::data($request, $document);
+        return $encodedImage;
     }
 }

src/Api/Controller/UploadImageController.php

@@ -0,0 +1,87 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Api\Controller;
+
+use Flarum\Settings\SettingsRepositoryInterface;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Str;
+use Intervention\Image\Image;
+use League\Flysystem\FilesystemInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\UploadedFileInterface;
+use Tobscure\JsonApi\Document;
+
+abstract class UploadImageController extends ShowForumController
+{
+    /**
+     * @var SettingsRepositoryInterface
+     */
+    protected $settings;
+
+    /**
+     * @var FilesystemInterface
+     */
+    protected $uploadDir;
+
+    /**
+     * @var string
+     */
+    protected $fileExtension = 'png';
+
+    /**
+     * @var string
+     */
+    protected $filePathSettingKey = '';
+
+    /**
+     * @var string
+     */
+    protected $filenamePrefix = '';
+
+    /**
+     * @param SettingsRepositoryInterface $settings
+     * @param FilesystemInterface $uploadDir
+     */
+    public function __construct(SettingsRepositoryInterface $settings, FilesystemInterface $uploadDir)
+    {
+        $this->settings = $settings;
+        $this->uploadDir = $uploadDir;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function data(ServerRequestInterface $request, Document $document)
+    {
+        $request->getAttribute('actor')->assertAdmin();
+
+        $file = Arr::get($request->getUploadedFiles(), $this->filenamePrefix);
+
+        $encodedImage = $this->makeImage($file);
+
+        if (($path = $this->settings->get($this->filePathSettingKey)) && $this->uploadDir->has($path)) {
+            $this->uploadDir->delete($path);
+        }
+
+        $uploadName = $this->filenamePrefix.'-'.Str::lower(Str::random(8)).'.'.$this->fileExtension;
+
+        $this->uploadDir->write($uploadName, $encodedImage);
+
+        $this->settings->set($this->filePathSettingKey, $uploadName);
+
+        return parent::data($request, $document);
+    }
+
+    /**
+     * @param UploadedFileInterface $file
+     * @return Image
+     */
+    abstract protected function makeImage(UploadedFileInterface $file): Image;
+}

src/Api/Controller/UploadLogoController.php

@@ -9,61 +9,27 @@
 
 namespace Flarum\Api\Controller;
 
-use Flarum\Settings\SettingsRepositoryInterface;
-use Illuminate\Support\Arr;
-use Illuminate\Support\Str;
+use Intervention\Image\Image;
 use Intervention\Image\ImageManager;
-use League\Flysystem\FilesystemInterface;
-use Psr\Http\Message\ServerRequestInterface;
-use Tobscure\JsonApi\Document;
+use Psr\Http\Message\UploadedFileInterface;
 
-class UploadLogoController extends ShowForumController
+class UploadLogoController extends UploadImageController
 {
-    /**
-     * @var SettingsRepositoryInterface
-     */
-    protected $settings;
+    protected $filePathSettingKey = 'logo_path';
 
-    /**
-     * @var FilesystemInterface
-     */
-    protected $uploadDir;
-
-    /**
-     * @param SettingsRepositoryInterface $settings
-     * @param FilesystemInterface $uploadDir
-     */
-    public function __construct(SettingsRepositoryInterface $settings, FilesystemInterface $uploadDir)
-    {
-        $this->settings = $settings;
-        $this->uploadDir = $uploadDir;
-    }
+    protected $filenamePrefix = 'logo';
 
     /**
      * {@inheritdoc}
      */
-    public function data(ServerRequestInterface $request, Document $document)
+    protected function makeImage(UploadedFileInterface $file): Image
     {
-        $request->getAttribute('actor')->assertAdmin();
-
-        $file = Arr::get($request->getUploadedFiles(), 'logo');
-
-        $manager = new ImageManager;
+        $manager = new ImageManager();
 
         $encodedImage = $manager->make($file->getStream())->heighten(60, function ($constraint) {
             $constraint->upsize();
         })->encode('png');
 
-        if (($path = $this->settings->get('logo_path')) && $this->uploadDir->has($path)) {
-            $this->uploadDir->delete($path);
-        }
-
-        $uploadName = 'logo-'.Str::lower(Str::random(8)).'.png';
-
-        $this->uploadDir->write($uploadName, $encodedImage);
-
-        $this->settings->set('logo_path', $uploadName);
-
-        return parent::data($request, $document);
+        return $encodedImage;
     }
 }