Implement web installer

src/Install/InstallServiceProvider.php

@@ -0,0 +1,60 @@
+<?php namespace Flarum\Install;
+
+use Flarum\Http\RouteCollection;
+use Flarum\Http\UrlGenerator;
+use Flarum\Support\ServiceProvider;
+use Psr\Http\Message\ServerRequestInterface;
+
+class InstallServiceProvider extends ServiceProvider
+{
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        $this->app->register('Flarum\Locale\LocaleServiceProvider');
+    }
+
+    /**
+     * Bootstrap the application events.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        $root = __DIR__.'/../..';
+
+        $this->loadViewsFrom($root.'/views/install', 'flarum.install');
+
+        $this->routes();
+    }
+
+    protected function routes()
+    {
+        $this->app->instance('flarum.install.routes', $routes = new RouteCollection);
+
+        $routes->get(
+            '/',
+            'flarum.install.index',
+            $this->action('Flarum\Install\Actions\IndexAction')
+        );
+
+        $routes->post(
+            '/',
+            'flarum.install.install',
+            $this->action('Flarum\Install\Actions\InstallAction')
+        );
+    }
+
+    protected function action($class)
+    {
+        return function (ServerRequestInterface $httpRequest, $routeParams) use ($class) {
+            /** @var \Flarum\Support\Action $action */
+            $action = $this->app->make($class);
+
+            return $action->handle($httpRequest, $routeParams);
+        };
+    }
+}