Add ability to uninstall an extension

framework/core/js/admin/src/components/ExtensionsPage.js

@@ -82,12 +82,20 @@ export default class ExtensionsPage extends Component {
       }
     }));
 
-    // if (!enabled) {
-    //   items.add('uninstall', Button.component({
-    //     icon: 'trash-o',
-    //     children: 'Uninstall'
-    //   }));
-    // }
+    if (!enabled) {
+      items.add('uninstall', Button.component({
+        icon: 'trash-o',
+        children: 'Uninstall',
+        onclick: () => {
+          app.request({
+            url: app.forum.attribute('apiUrl') + '/extensions/' + extension.name,
+            method: 'DELETE',
+          }).then(() => window.location.reload());
+
+          app.modal.show(new LoadingModal());
+        }
+      }));
+    }
 
     // items.add('separator2', Separator.component());
 

framework/core/src/Api/Actions/Extensions/DeleteAction.php

@@ -0,0 +1,37 @@
+<?php namespace Flarum\Api\Actions\Extensions;
+
+use Flarum\Api\Actions\DeleteAction as BaseDeleteAction;
+use Flarum\Api\Request;
+use Illuminate\Contracts\Bus\Dispatcher;
+use Flarum\Core\Exceptions\PermissionDeniedException;
+use Flarum\Support\ExtensionManager;
+
+class DeleteAction extends BaseDeleteAction
+{
+    protected $extensions;
+
+    public function __construct(ExtensionManager $extensions)
+    {
+        $this->extensions = $extensions;
+    }
+
+    protected function delete(Request $request)
+    {
+        if (! $request->actor->isAdmin()) {
+            throw new PermissionDeniedException;
+        }
+
+        $name = $request->get('name');
+
+        $this->extensions->disable($name);
+        $this->extensions->uninstall($name);
+
+        app('flarum.formatter')->flush();
+
+        $forum = app('Flarum\Forum\Actions\ClientAction');
+        $forum->flushAssets();
+
+        $admin = app('Flarum\Admin\Actions\ClientAction');
+        $admin->flushAssets();
+    }
+}

framework/core/src/Api/ApiServiceProvider.php

@@ -306,6 +306,13 @@ class ApiServiceProvider extends ServiceProvider
             $this->action('Flarum\Api\Actions\Extensions\UpdateAction')
         );
 
+        // Uninstall an extension
+        $routes->delete(
+            '/extensions/{name}',
+            'flarum.api.extensions.delete',
+            $this->action('Flarum\Api\Actions\Extensions\DeleteAction')
+        );
+
         // Update config settings
         $routes->post(
             '/config',

framework/core/src/Core/Settings/DatabaseSettingsRepository.php

@@ -35,4 +35,9 @@ class DatabaseSettingsRepository implements SettingsRepository
 
         $query->$method(compact('key', 'value'));
     }
+
+    public function delete($key)
+    {
+        $this->database->table('config')->where('key', $key)->delete();
+    }
 }

framework/core/src/Core/Settings/MemoryCacheSettingsRepository.php

@@ -42,4 +42,11 @@ class MemoryCacheSettingsRepository implements SettingsRepository
 
         $this->inner->set($key, $value);
     }
+
+    public function delete($key)
+    {
+        unset($this->cache[$key]);
+
+        $this->inner->delete($key);
+    }
 }

framework/core/src/Core/Settings/SettingsRepository.php

@@ -9,4 +9,6 @@ interface SettingsRepository
     public function get($key, $default = null);
 
     public function set($key, $value);
+
+    public function delete($key);
 }