Merge remote-tracking branch 'extensions_likes/REWRITE'

extensions/likes/.editorconfig

@@ -0,0 +1,19 @@
+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[*.{diff,md}]
+trim_trailing_whitespace = false
+
+[*.{php,xml,json}]
+indent_size = 4

extensions/likes/.gitattributes

@@ -0,0 +1,18 @@
+.gitattributes export-ignore
+.gitignore export-ignore
+.gitmodules export-ignore
+.github export-ignore
+.travis export-ignore
+.travis.yml export-ignore
+.editorconfig export-ignore
+.styleci.yml export-ignore
+
+phpunit.xml export-ignore
+tests export-ignore
+
+js/dist/* -diff
+js/dist/* linguist-generated
+js/dist-typings/* linguist-generated
+js/yarn.lock -diff
+
+* text=auto eol=lf

extensions/likes/.github/workflows/backend.yml

@@ -0,0 +1,15 @@
+name: Likes PHP
+
+on: [workflow_dispatch, push, pull_request]
+
+# The reusable workflow definitions will be moved to the `flarum/framework` repo soon.
+# This will break your current script.
+# When this happens, run `flarum-cli audit infra --fix` to update your infrastructure.
+
+jobs:
+  run:
+    uses: flarum/.github/.github/workflows/REUSABLE_backend.yml@main
+    with:
+      enable_backend_testing: false
+
+      backend_directory: .

extensions/likes/.github/workflows/frontend.yml

@@ -0,0 +1,21 @@
+name: Likes JS
+
+on: [workflow_dispatch, push, pull_request]
+
+# The reusable workflow definitions will be moved to the `flarum/framework` repo soon.
+# This will break your current script.
+# When this happens, run `flarum-cli audit infra --fix` to update your infrastructure.
+
+jobs:
+  run:
+    uses: flarum/.github/.github/workflows/REUSABLE_frontend.yml@main
+    with:
+      enable_bundlewatch: false
+      enable_prettier: true
+      enable_typescript: false
+
+      frontend_directory: ./js
+      main_git_branch: master
+
+    secrets:
+      bundlewatch_github_token: ${{ secrets.BUNDLEWATCH_GITHUB_TOKEN }}

extensions/likes/.gitignore

@@ -0,0 +1,12 @@
+/vendor
+composer.lock
+composer.phar
+
+.DS_Store
+Thumbs.db
+tests/.phpunit.result.cache
+/tests/integration/tmp
+.vagrant
+.idea/*
+.vscode
+js/coverage-ts

extensions/likes/.styleci.yml

@@ -0,0 +1,14 @@
+preset: recommended
+
+enabled:
+  - logical_not_operators_with_successor_space
+
+disabled:
+  - align_double_arrow
+  - blank_line_after_opening_tag
+  - multiline_array_trailing_comma
+  - new_with_braces
+  - phpdoc_align
+  - phpdoc_order
+  - phpdoc_separation
+  - phpdoc_types

extensions/likes/CHANGELOG.md

@@ -0,0 +1,62 @@
+# Changelog
+
+## [1.2.0](https://github.com/flarum/likes/compare/v1.1.0...v1.2.0)
+
+No changes.
+
+## [1.1.0](https://github.com/flarum/likes/compare/v1.0.0...v1.1.0)
+
+### Changed
+- Add missing dot to `liked_by_text` translation (https://github.com/flarum/likes/pulls/29)
+
+## [1.0.0](https://github.com/flarum/likes/compare/v0.1.0-beta.16...v1.0.0)
+
+### Added
+- Creation time stored for likes in the database (https://github.com/flarum/likes/pull/28)
+
+### Changed
+- Compatibility with Flarum v1.0.0.
+
+## [0.1.0-beta.16](https://github.com/flarum/likes/compare/v0.1.0-beta.15...v0.1.0-beta.16)
+
+### Changed
+- Updated admin category from discussion to feature (https://github.com/flarum/likes/pull/26)
+- Moved locale files from translation pack to extension (https://github.com/flarum/likes/pull/23)
+
+## [0.1.0-beta.15](https://github.com/flarum/likes/compare/v0.1.0-beta.14...v0.1.0-beta.15)
+
+### Changed
+- Updated composer.json and admin javascript for new admin area.
+- Updated to use newest extenders.
+
+## [0.1.0-beta.14](https://github.com/flarum/likes/compare/v0.1.0-beta.13...v0.1.0-beta.14)
+
+### Changed
+- Updated mithril to version 2
+- Load language strings correctly on en-/disable
+- Updated JS dependencies
+
+## [0.1.0-beta.13](https://github.com/flarum/likes/compare/v0.1.0-beta.12...v0.1.0-beta.13)
+
+### Changed
+- Updated JS dependencies
+- Stop using deprecated core events, use extenders instead
+
+## [0.1.0-beta.12](https://github.com/flarum/likes/compare/v0.1.0-beta.9...v0.1.0-beta.12)
+
+### Fixed
+
+- Fix notifications being sent to deleted users ([726ddfe](https://github.com/flarum/likes/commit/726ddfe1b45f2752f6179848a7128e520b1860fc))
+
+## [0.1.0-beta.9](https://github.com/flarum/likes/compare/v0.1.0-beta.8.1...v0.1.0-beta.9)
+
+### Changed
+- Replace event subscribers (that resolve services too early) with listeners ([0b3fbc5](https://github.com/flarum/likes/commit/0b3fbc5813a5b52e8b81aaf557dcf1ec37d1481a))
+- Compatibility with Laravel 5.7 ([c2281d1](https://github.com/flarum/likes/commit/c2281d14f6e9268c6eb306781ffb43d74095cc9e))
+
+## [0.1.0-beta.8.1](https://github.com/flarum/likes/compare/v0.1.0-beta.8...v0.1.0-beta.8.1)
+
+### Fixed
+- Fix dropping foreign keys in `down` migrations ([4e92f20](https://github.com/flarum/likes/commit/4e92f20d7a18efc08bb24e0767014e4ba689c805))
+- Truncate notification excerpts ([55524aa](https://github.com/flarum/likes/commit/55524aa2e87951c858bf20d960e1f4f9a86a103f))
+- Prevent possible crash on discussion view ([84bcc0e](https://github.com/flarum/likes/commit/84bcc0e283295b6109d4bc1449d8ba06b156ca01))

extensions/likes/LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2019-2021 Stichting Flarum (Flarum Foundation)
+Copyright (c) 2014-2019 Toby Zerner (toby.zerner@gmail.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

extensions/likes/composer.json

@@ -0,0 +1,60 @@
+{
+    "name": "flarum/likes",
+    "description": "Allow users to like posts.",
+    "type": "flarum-extension",
+    "keywords": [
+        "discussion"
+    ],
+    "license": "MIT",
+    "support": {
+        "issues": "https://github.com/flarum/core/issues",
+        "source": "https://github.com/flarum/likes",
+        "forum": "https://discuss.flarum.org"
+    },
+    "homepage": "https://flarum.org",
+    "funding": [
+        {
+            "type": "website",
+            "url": "https://flarum.org/donate/"
+        }
+    ],
+    "require": {
+        "flarum/core": "^1.2"
+    },
+    "autoload": {
+        "psr-4": {
+            "Flarum\\Likes\\": "src/"
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.x-dev"
+        },
+        "flarum-extension": {
+            "title": "Likes",
+            "category": "feature",
+            "icon": {
+                "name": "far fa-thumbs-up",
+                "backgroundColor": "#3A649D",
+                "color": "#fff"
+            }
+        },
+        "flarum-cli": {
+            "modules": {
+                "admin": true,
+                "forum": true,
+                "js": true,
+                "jsCommon": false,
+                "css": true,
+                "gitConf": true,
+                "githubActions": true,
+                "prettier": true,
+                "typescript": false,
+                "bundlewatch": false,
+                "backendTesting": false,
+                "editorConfig": true,
+                "styleci": true
+            }
+        }
+    }
+}

extensions/likes/extend.php

@@ -0,0 +1,62 @@
+<?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.
+ */
+
+use Flarum\Api\Controller;
+use Flarum\Api\Serializer\BasicUserSerializer;
+use Flarum\Api\Serializer\PostSerializer;
+use Flarum\Extend;
+use Flarum\Likes\Event\PostWasLiked;
+use Flarum\Likes\Event\PostWasUnliked;
+use Flarum\Likes\Listener;
+use Flarum\Likes\Notification\PostLikedBlueprint;
+use Flarum\Post\Event\Deleted;
+use Flarum\Post\Event\Saving;
+use Flarum\Post\Post;
+use Flarum\User\User;
+
+return [
+    (new Extend\Frontend('forum'))
+        ->js(__DIR__.'/js/dist/forum.js')
+        ->css(__DIR__.'/less/forum.less'),
+
+    (new Extend\Frontend('admin'))
+        ->js(__DIR__.'/js/dist/admin.js'),
+
+    (new Extend\Model(Post::class))
+        ->belongsToMany('likes', User::class, 'post_likes', 'post_id', 'user_id'),
+
+    new Extend\Locales(__DIR__.'/locale'),
+
+    (new Extend\Notification())
+        ->type(PostLikedBlueprint::class, PostSerializer::class, ['alert']),
+
+    (new Extend\ApiSerializer(PostSerializer::class))
+        ->hasMany('likes', BasicUserSerializer::class)
+        ->attribute('canLike', function (PostSerializer $serializer, $model) {
+            return (bool) $serializer->getActor()->can('like', $model);
+        }),
+
+    (new Extend\ApiController(Controller\ShowDiscussionController::class))
+        ->addInclude('posts.likes'),
+
+    (new Extend\ApiController(Controller\ListPostsController::class))
+        ->addInclude('likes'),
+    (new Extend\ApiController(Controller\ShowPostController::class))
+        ->addInclude('likes'),
+    (new Extend\ApiController(Controller\CreatePostController::class))
+        ->addInclude('likes'),
+    (new Extend\ApiController(Controller\UpdatePostController::class))
+        ->addInclude('likes'),
+
+    (new Extend\Event())
+        ->listen(PostWasLiked::class, Listener\SendNotificationWhenPostIsLiked::class)
+        ->listen(PostWasUnliked::class, Listener\SendNotificationWhenPostIsUnliked::class)
+        ->listen(Deleted::class, [Listener\SaveLikesToDatabase::class, 'whenPostIsDeleted'])
+        ->listen(Saving::class, [Listener\SaveLikesToDatabase::class, 'whenPostIsSaving']),
+];

extensions/likes/js/.gitignore

@@ -0,0 +1,9 @@
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+node_modules

extensions/likes/js/admin.js

@@ -0,0 +1 @@
+export * from './src/admin';

extensions/likes/js/dist/admin.js

@@ -0,0 +1,2 @@
+(()=>{var e={n:r=>{var o=r&&r.__esModule?()=>r.default:()=>r;return e.d(o,{a:o}),o},d:(r,o)=>{for(var t in o)e.o(o,t)&&!e.o(r,t)&&Object.defineProperty(r,t,{enumerable:!0,get:o[t]})},o:(e,r)=>Object.prototype.hasOwnProperty.call(e,r),r:e=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})}},r={};(()=>{"use strict";e.r(r);const o=flarum.core.compat["admin/app"];var t=e.n(o);t().initializers.add("flarum-likes",(function(){t().extensionData.for("flarum-likes").registerPermission({icon:"far fa-thumbs-up",label:t().translator.trans("flarum-likes.admin.permissions.like_posts_label"),permission:"discussion.likePosts"},"reply")}))})(),module.exports=r})();
+//# sourceMappingURL=admin.js.map

extensions/likes/js/dist/admin.js.map

@@ -0,0 +1 @@
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extensions/likes/js/dist/forum.js

@@ -0,0 +1,2 @@
+(()=>{var t={n:o=>{var n=o&&o.__esModule?()=>o.default:()=>o;return t.d(n,{a:n}),n},d:(o,n)=>{for(var e in n)t.o(n,e)&&!t.o(o,e)&&Object.defineProperty(o,e,{enumerable:!0,get:n[e]})},o:(t,o)=>Object.prototype.hasOwnProperty.call(t,o),r:t=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})}},o={};(()=>{"use strict";t.r(o);const n=flarum.core.compat["common/extend"],e=flarum.core.compat["forum/app"];var r=t.n(e);const s=flarum.core.compat["common/models/Post"];var a=t.n(s);const i=flarum.core.compat["common/Model"];var c=t.n(i);const u=flarum.core.compat["forum/components/NotificationGrid"];var l=t.n(u);const f=flarum.core.compat["common/components/Button"];var p=t.n(f);const d=flarum.core.compat["forum/components/CommentPost"];var k=t.n(d);const h=flarum.core.compat["common/components/Link"];var v=t.n(h);const y=flarum.core.compat["common/helpers/punctuateSeries"];var _=t.n(y);const b=flarum.core.compat["common/helpers/username"];var g=t.n(b);const P=flarum.core.compat["common/helpers/icon"];var L=t.n(P);function M(t,o){return M=Object.setPrototypeOf||function(t,o){return t.__proto__=o,t},M(t,o)}function x(t,o){t.prototype=Object.create(o.prototype),t.prototype.constructor=t,M(t,o)}const j=flarum.core.compat["common/components/Modal"];var O=t.n(j);const N=flarum.core.compat["common/helpers/avatar"];var S=t.n(N),B=function(t){function o(){return t.apply(this,arguments)||this}x(o,t);var n=o.prototype;return n.className=function(){return"PostLikesModal Modal--small"},n.title=function(){return r().translator.trans("flarum-likes.forum.post_likes.title")},n.content=function(){return m("div",{className:"Modal-body"},m("ul",{className:"PostLikesModal-list"},this.attrs.post.likes().map((function(t){return m("li",null,m(v(),{href:r().route.user(t)},S()(t)," ",g()(t)))}))))},o}(O());const T=flarum.core.compat["forum/components/Notification"];var w=t.n(T);const C=flarum.core.compat["common/utils/string"];var I=function(t){function o(){return t.apply(this,arguments)||this}x(o,t);var n=o.prototype;return n.icon=function(){return"far fa-thumbs-up"},n.href=function(){return r().route.post(this.attrs.notification.subject())},n.content=function(){var t=this.attrs.notification.fromUser();return r().translator.trans("flarum-likes.forum.notifications.post_liked_text",{user:t,count:1})},n.excerpt=function(){return(0,C.truncate)(this.attrs.notification.subject().contentPlain(),200)},o}(w());r().initializers.add("flarum-likes",(function(){r().notificationComponents.postLiked=I,a().prototype.canLike=c().attribute("canLike"),a().prototype.likes=c().hasMany("likes"),(0,n.extend)(k().prototype,"actionItems",(function(t){var o=this.attrs.post;if(!o.isHidden()&&o.canLike()){var n=o.likes(),e=r().session.user&&n&&n.some((function(t){return t===r().session.user}));t.add("like",p().component({className:"Button Button--link",onclick:function(){e=!e,o.save({isLiked:e});var t=o.data.relationships.likes.data;t.some((function(o,n){if(o.id===r().session.user.id())return t.splice(n,1),!0})),e&&t.unshift({type:"users",id:r().session.user.id()})}},r().translator.trans(e?"flarum-likes.forum.post.unlike_link":"flarum-likes.forum.post.like_link")))}})),(0,n.extend)(k().prototype,"footerItems",(function(t){var o=this.attrs.post,n=o.likes();if(n&&n.length){var e=n.length>4,s=n.sort((function(t){return t===r().session.user?-1:1})).slice(0,e?3:4).map((function(t){return m(v(),{href:r().route.user(t)},t===r().session.user?r().translator.trans("flarum-likes.forum.post.you_text"):g()(t))}));if(e){var a=n.length-s.length;s.push(m("a",{href:"#",onclick:function(t){t.preventDefault(),r().modal.show(B,{post:o})}},r().translator.trans("flarum-likes.forum.post.others_link",{count:a})))}t.add("liked",m("div",{className:"Post-likedBy"},L()("far fa-thumbs-up"),r().translator.trans("flarum-likes.forum.post.liked_by"+(n[0]===r().session.user?"_self":"")+"_text",{count:s.length,users:_()(s)})))}})),(0,n.extend)(l().prototype,"notificationTypes",(function(t){t.add("postLiked",{name:"postLiked",icon:"far fa-thumbs-up",label:r().translator.trans("flarum-likes.forum.settings.notify_post_liked_label")})}))}))})(),module.exports=o})();
+//# sourceMappingURL=forum.js.map

extensions/likes/js/forum.js

@@ -0,0 +1 @@
+export * from './src/forum';

extensions/likes/js/package.json

@@ -0,0 +1,19 @@
+{
+    "private": true,
+    "name": "@flarum/likes",
+    "prettier": "@flarum/prettier-config",
+    "devDependencies": {
+        "prettier": "^2.5.1",
+        "flarum-webpack-config": "^2.0.0",
+        "webpack": "^5.65.0",
+        "webpack-cli": "^4.9.1",
+        "@flarum/prettier-config": "^1.0.0"
+    },
+    "scripts": {
+        "dev": "webpack --mode development --watch",
+        "build": "webpack --mode production",
+        "format": "prettier --write src",
+        "format-check": "prettier --check src",
+        "analyze": "cross-env ANALYZER=true yarn build"
+    }
+}

extensions/likes/js/src/admin/index.js

@@ -0,0 +1,12 @@
+import app from 'flarum/admin/app';
+
+app.initializers.add('flarum-likes', () => {
+  app.extensionData.for('flarum-likes').registerPermission(
+    {
+      icon: 'far fa-thumbs-up',
+      label: app.translator.trans('flarum-likes.admin.permissions.like_posts_label'),
+      permission: 'discussion.likePosts',
+    },
+    'reply'
+  );
+});

extensions/likes/js/src/forum/addLikeAction.js

@@ -0,0 +1,46 @@
+import { extend } from 'flarum/common/extend';
+import app from 'flarum/forum/app';
+import Button from 'flarum/common/components/Button';
+import CommentPost from 'flarum/forum/components/CommentPost';
+
+export default function () {
+  extend(CommentPost.prototype, 'actionItems', function (items) {
+    const post = this.attrs.post;
+
+    if (post.isHidden() || !post.canLike()) return;
+
+    const likes = post.likes();
+
+    let isLiked = app.session.user && likes && likes.some((user) => user === app.session.user);
+
+    items.add(
+      'like',
+      Button.component(
+        {
+          className: 'Button Button--link',
+          onclick: () => {
+            isLiked = !isLiked;
+
+            post.save({ isLiked });
+
+            // We've saved the fact that we do or don't like the post, but in order
+            // to provide instantaneous feedback to the user, we'll need to add or
+            // remove the like from the relationship data manually.
+            const data = post.data.relationships.likes.data;
+            data.some((like, i) => {
+              if (like.id === app.session.user.id()) {
+                data.splice(i, 1);
+                return true;
+              }
+            });
+
+            if (isLiked) {
+              data.unshift({ type: 'users', id: app.session.user.id() });
+            }
+          },
+        },
+        app.translator.trans(isLiked ? 'flarum-likes.forum.post.unlike_link' : 'flarum-likes.forum.post.like_link')
+      )
+    );
+  });
+}

extensions/likes/js/src/forum/addLikesList.js

@@ -0,0 +1,64 @@
+import { extend } from 'flarum/common/extend';
+import app from 'flarum/forum/app';
+import CommentPost from 'flarum/forum/components/CommentPost';
+import Link from 'flarum/common/components/Link';
+import punctuateSeries from 'flarum/common/helpers/punctuateSeries';
+import username from 'flarum/common/helpers/username';
+import icon from 'flarum/common/helpers/icon';
+
+import PostLikesModal from './components/PostLikesModal';
+
+export default function () {
+  extend(CommentPost.prototype, 'footerItems', function (items) {
+    const post = this.attrs.post;
+    const likes = post.likes();
+
+    if (likes && likes.length) {
+      const limit = 4;
+      const overLimit = likes.length > limit;
+
+      // Construct a list of names of users who have liked this post. Make sure the
+      // current user is first in the list, and cap a maximum of 4 items.
+      const names = likes
+        .sort((a) => (a === app.session.user ? -1 : 1))
+        .slice(0, overLimit ? limit - 1 : limit)
+        .map((user) => {
+          return (
+            <Link href={app.route.user(user)}>
+              {user === app.session.user ? app.translator.trans('flarum-likes.forum.post.you_text') : username(user)}
+            </Link>
+          );
+        });
+
+      // If there are more users that we've run out of room to display, add a "x
+      // others" name to the end of the list. Clicking on it will display a modal
+      // with a full list of names.
+      if (overLimit) {
+        const count = likes.length - names.length;
+
+        names.push(
+          <a
+            href="#"
+            onclick={(e) => {
+              e.preventDefault();
+              app.modal.show(PostLikesModal, { post });
+            }}
+          >
+            {app.translator.trans('flarum-likes.forum.post.others_link', { count })}
+          </a>
+        );
+      }
+
+      items.add(
+        'liked',
+        <div className="Post-likedBy">
+          {icon('far fa-thumbs-up')}
+          {app.translator.trans('flarum-likes.forum.post.liked_by' + (likes[0] === app.session.user ? '_self' : '') + '_text', {
+            count: names.length,
+            users: punctuateSeries(names),
+          })}
+        </div>
+      );
+    }
+  });
+}

extensions/likes/js/src/forum/components/PostLikedNotification.js

@@ -0,0 +1,24 @@
+import app from 'flarum/forum/app';
+import Notification from 'flarum/forum/components/Notification';
+import { truncate } from 'flarum/common/utils/string';
+
+export default class PostLikedNotification extends Notification {
+  icon() {
+    return 'far fa-thumbs-up';
+  }
+
+  href() {
+    return app.route.post(this.attrs.notification.subject());
+  }
+
+  content() {
+    const notification = this.attrs.notification;
+    const user = notification.fromUser();
+
+    return app.translator.trans('flarum-likes.forum.notifications.post_liked_text', { user, count: 1 });
+  }
+
+  excerpt() {
+    return truncate(this.attrs.notification.subject().contentPlain(), 200);
+  }
+}

extensions/likes/js/src/forum/components/PostLikesModal.js

@@ -0,0 +1,31 @@
+import app from 'flarum/forum/app';
+import Modal from 'flarum/common/components/Modal';
+import Link from 'flarum/common/components/Link';
+import avatar from 'flarum/common/helpers/avatar';
+import username from 'flarum/common/helpers/username';
+
+export default class PostLikesModal extends Modal {
+  className() {
+    return 'PostLikesModal Modal--small';
+  }
+
+  title() {
+    return app.translator.trans('flarum-likes.forum.post_likes.title');
+  }
+
+  content() {
+    return (
+      <div className="Modal-body">
+        <ul className="PostLikesModal-list">
+          {this.attrs.post.likes().map((user) => (
+            <li>
+              <Link href={app.route.user(user)}>
+                {avatar(user)} {username(user)}
+              </Link>
+            </li>
+          ))}
+        </ul>
+      </div>
+    );
+  }
+}

extensions/likes/js/src/forum/index.js

@@ -0,0 +1,27 @@
+import { extend } from 'flarum/common/extend';
+import app from 'flarum/forum/app';
+import Post from 'flarum/common/models/Post';
+import Model from 'flarum/common/Model';
+import NotificationGrid from 'flarum/forum/components/NotificationGrid';
+
+import addLikeAction from './addLikeAction';
+import addLikesList from './addLikesList';
+import PostLikedNotification from './components/PostLikedNotification';
+
+app.initializers.add('flarum-likes', () => {
+  app.notificationComponents.postLiked = PostLikedNotification;
+
+  Post.prototype.canLike = Model.attribute('canLike');
+  Post.prototype.likes = Model.hasMany('likes');
+
+  addLikeAction();
+  addLikesList();
+
+  extend(NotificationGrid.prototype, 'notificationTypes', function (items) {
+    items.add('postLiked', {
+      name: 'postLiked',
+      icon: 'far fa-thumbs-up',
+      label: app.translator.trans('flarum-likes.forum.settings.notify_post_liked_label'),
+    });
+  });
+});

extensions/likes/js/webpack.config.js

@@ -0,0 +1 @@
+module.exports = require('flarum-webpack-config')();

extensions/likes/less/forum.less

@@ -0,0 +1,23 @@
+.PostLikesModal-list {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+
+  a {
+    color: @text-color;
+    font-size: 15px;
+    font-weight: bold;
+    display: block;
+    margin-bottom: 10px;
+    text-decoration: none;
+
+    &:hover .username {
+      text-decoration: underline;
+    }
+  }
+  .Avatar {
+    .Avatar--size(32px);
+    vertical-align: middle;
+    margin-right: 5px;
+  }
+}

extensions/likes/locale/en.yml

@@ -0,0 +1,37 @@
+flarum-likes:
+
+  ##
+  # UNIQUE KEYS - The following keys are used in only one location each.
+  ##
+
+  # Translations in this namespace are used by the admin interface.
+  admin:
+
+    # These translations are used in the Permissions page of the admin interface.
+    permissions:
+      like_posts_label: Like posts
+
+  # Translations in this namespace are used by the forum user interface.
+  forum:
+
+    # These translations are used by the Notifications dropdown, a.k.a. "the bell".
+    notifications:
+      others_text: => core.ref.some_others
+      post_liked_text: "{username} liked your post"  # Can be pluralized to agree with the number of users!
+
+    # These translations are displayed beneath individual posts.
+    post:
+      like_link: Like
+      liked_by_self_text: "{users} like this."  # Can be pluralized to agree with the number of users!
+      liked_by_text: "{count, plural, one {{users} likes this} other {{users} like this}}."
+      others_link: => core.ref.some_others
+      unlike_link: Unlike
+      you_text: => core.ref.you
+
+    # These translations are used by the Users Who Like This modal dialog.
+    post_likes:
+      title: Users Who Like This
+
+    # These translations are used in the Settings page.
+    settings:
+      notify_post_liked_label: Someone likes one of my posts

extensions/likes/migrations/2015_05_11_000000_create_posts_likes_table.php

@@ -0,0 +1,20 @@
+<?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.
+ */
+
+use Flarum\Database\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+return Migration::createTable(
+    'posts_likes',
+    function (Blueprint $table) {
+        $table->integer('post_id')->unsigned();
+        $table->integer('user_id')->unsigned();
+        $table->primary(['post_id', 'user_id']);
+    }
+);

extensions/likes/migrations/2015_09_04_000000_add_default_like_permissions.php

@@ -0,0 +1,15 @@
+<?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.
+ */
+
+use Flarum\Database\Migration;
+use Flarum\Group\Group;
+
+return Migration::addPermissions([
+    'discussion.likePosts' => Group::MEMBER_ID
+]);

extensions/likes/migrations/2018_06_27_100600_rename_posts_likes_to_post_likes.php

@@ -0,0 +1,12 @@
+<?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.
+ */
+
+use Flarum\Database\Migration;
+
+return Migration::renameTable('posts_likes', 'post_likes');

extensions/likes/migrations/2018_06_27_100700_change_post_likes_add_foreign_keys.php

@@ -0,0 +1,39 @@
+<?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.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        // Delete rows with non-existent entities so that we will be able to create
+        // foreign keys without any issues.
+        $schema->getConnection()
+            ->table('post_likes')
+            ->whereNotExists(function ($query) {
+                $query->selectRaw(1)->from('posts')->whereColumn('id', 'post_id');
+            })
+            ->orWhereNotExists(function ($query) {
+                $query->selectRaw(1)->from('users')->whereColumn('id', 'user_id');
+            })
+            ->delete();
+
+        $schema->table('post_likes', function (Blueprint $table) {
+            $table->foreign('post_id')->references('id')->on('posts')->onDelete('cascade');
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+        });
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('post_likes', function (Blueprint $table) {
+            $table->dropForeign(['post_id']);
+            $table->dropForeign(['user_id']);
+        });
+    }
+];

extensions/likes/migrations/2021_05_10_094200_add_created_at_to_post_likes_table.php

@@ -0,0 +1,18 @@
+<?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.
+ */
+
+use Flarum\Database\Migration;
+
+return Migration::addColumns('post_likes', [
+    'created_at' => [
+        'timestamp',
+        'null' => false,
+        'useCurrent' => true,
+    ],
+]);

extensions/likes/src/Event/PostWasLiked.php

@@ -0,0 +1,36 @@
+<?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\Likes\Event;
+
+use Flarum\Post\Post;
+use Flarum\User\User;
+
+class PostWasLiked
+{
+    /**
+     * @var Post
+     */
+    public $post;
+
+    /**
+     * @var User
+     */
+    public $user;
+
+    /**
+     * @param Post $post
+     * @param User $user
+     */
+    public function __construct(Post $post, User $user)
+    {
+        $this->post = $post;
+        $this->user = $user;
+    }
+}

extensions/likes/src/Event/PostWasUnliked.php

@@ -0,0 +1,36 @@
+<?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\Likes\Event;
+
+use Flarum\Post\Post;
+use Flarum\User\User;
+
+class PostWasUnliked
+{
+    /**
+     * @var Post
+     */
+    public $post;
+
+    /**
+     * @var User
+     */
+    public $user;
+
+    /**
+     * @param Post $post
+     * @param User $user
+     */
+    public function __construct(Post $post, User $user)
+    {
+        $this->post = $post;
+        $this->user = $user;
+    }
+}

extensions/likes/src/Listener/SaveLikesToDatabase.php

@@ -0,0 +1,54 @@
+<?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\Likes\Listener;
+
+use Flarum\Likes\Event\PostWasLiked;
+use Flarum\Likes\Event\PostWasUnliked;
+use Flarum\Post\Event\Deleted;
+use Flarum\Post\Event\Saving;
+
+class SaveLikesToDatabase
+{
+    /**
+     * @param Saving $event
+     */
+    public static function whenPostIsSaving(Saving $event)
+    {
+        $post = $event->post;
+        $data = $event->data;
+
+        if ($post->exists && isset($data['attributes']['isLiked'])) {
+            $actor = $event->actor;
+            $liked = (bool) $data['attributes']['isLiked'];
+
+            $actor->assertCan('like', $post);
+
+            $currentlyLiked = $post->likes()->where('user_id', $actor->id)->exists();
+
+            if ($liked && ! $currentlyLiked) {
+                $post->likes()->attach($actor->id);
+
+                $post->raise(new PostWasLiked($post, $actor));
+            } elseif ($currentlyLiked) {
+                $post->likes()->detach($actor->id);
+
+                $post->raise(new PostWasUnliked($post, $actor));
+            }
+        }
+    }
+
+    /**
+     * @param Deleted $event
+     */
+    public static function whenPostIsDeleted(Deleted $event)
+    {
+        $event->post->likes()->detach();
+    }
+}

extensions/likes/src/Listener/SendNotificationWhenPostIsLiked.php

@@ -0,0 +1,40 @@
+<?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\Likes\Listener;
+
+use Flarum\Likes\Event\PostWasLiked;
+use Flarum\Likes\Notification\PostLikedBlueprint;
+use Flarum\Notification\NotificationSyncer;
+
+class SendNotificationWhenPostIsLiked
+{
+    /**
+     * @var NotificationSyncer
+     */
+    protected $notifications;
+
+    /**
+     * @param NotificationSyncer $notifications
+     */
+    public function __construct(NotificationSyncer $notifications)
+    {
+        $this->notifications = $notifications;
+    }
+
+    public function handle(PostWasLiked $event)
+    {
+        if ($event->post->user && $event->post->user->id != $event->user->id) {
+            $this->notifications->sync(
+                new PostLikedBlueprint($event->post, $event->user),
+                [$event->post->user]
+            );
+        }
+    }
+}

extensions/likes/src/Listener/SendNotificationWhenPostIsUnliked.php

@@ -0,0 +1,40 @@
+<?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\Likes\Listener;
+
+use Flarum\Likes\Event\PostWasUnliked;
+use Flarum\Likes\Notification\PostLikedBlueprint;
+use Flarum\Notification\NotificationSyncer;
+
+class SendNotificationWhenPostIsUnliked
+{
+    /**
+     * @var NotificationSyncer
+     */
+    protected $notifications;
+
+    /**
+     * @param NotificationSyncer $notifications
+     */
+    public function __construct(NotificationSyncer $notifications)
+    {
+        $this->notifications = $notifications;
+    }
+
+    public function handle(PostWasUnliked $event)
+    {
+        if ($event->post->user && $event->post->user->id != $event->user->id) {
+            $this->notifications->sync(
+                new PostLikedBlueprint($event->post, $event->user),
+                []
+            );
+        }
+    }
+}

extensions/likes/src/Notification/PostLikedBlueprint.php

@@ -0,0 +1,76 @@
+<?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\Likes\Notification;
+
+use Flarum\Notification\Blueprint\BlueprintInterface;
+use Flarum\Post\Post;
+use Flarum\User\User;
+
+class PostLikedBlueprint implements BlueprintInterface
+{
+    /**
+     * @var Post
+     */
+    public $post;
+
+    /**
+     * @var User
+     */
+    public $user;
+
+    /**
+     * @param Post $post
+     * @param User $user
+     */
+    public function __construct(Post $post, User $user)
+    {
+        $this->post = $post;
+        $this->user = $user;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSubject()
+    {
+        return $this->post;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFromUser()
+    {
+        return $this->user;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getData()
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function getType()
+    {
+        return 'postLiked';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function getSubjectModel()
+    {
+        return Post::class;
+    }
+}