Add delete avatar action

src/Core/Commands/DeleteAvatarCommand.php

@@ -0,0 +1,20 @@
+<?php namespace Flarum\Core\Commands;
+
+use RuntimeException;
+
+class DeleteAvatarCommand
+{
+    public $userId;
+
+    public $actor;
+
+    public function __construct($userId, $actor)
+    {
+        if (empty($userId) || !intval($userId)) {
+            throw new RuntimeException('No valid user ID specified.');
+        }
+
+        $this->userId = $userId;
+        $this->actor = $actor;
+    }
+}

src/Core/Events/AvatarWillBeDeleted.php

@@ -0,0 +1,16 @@
+<?php namespace Flarum\Core\Events;
+
+use Flarum\Core\Models\User;
+
+class AvatarWillBeDeleted
+{
+    public $user;
+
+    public $command;
+
+    public function __construct(User $user, $command)
+    {
+        $this->user = $user;
+        $this->command = $command;
+    }
+}

src/Core/Handlers/Commands/DeleteAvatarCommandHandler.php

@@ -0,0 +1,53 @@
+<?php namespace Flarum\Core\Handlers\Commands;
+
+use Flarum\Core\Commands\DeleteAvatarCommand;
+use Flarum\Core\Events\AvatarWillBeDeleted;
+use Flarum\Core\Repositories\UserRepositoryInterface;
+use Flarum\Core\Support\DispatchesEvents;
+use League\Flysystem\Adapter\Local;
+use League\Flysystem\Filesystem;
+use League\Flysystem\FilesystemInterface;
+use League\Flysystem\MountManager;
+
+class DeleteAvatarCommandHandler
+{
+    use DispatchesEvents;
+
+    /**
+     * @var UserRepositoryInterface
+     */
+    protected $users;
+
+    /**
+     * @var FilesystemInterface
+     */
+    protected $uploadDir;
+
+    public function __construct(UserRepositoryInterface $users, FilesystemInterface $uploadDir)
+    {
+        $this->users = $users;
+        $this->uploadDir = $uploadDir;
+    }
+
+    public function handle(DeleteAvatarCommand $command)
+    {
+        $user = $this->users->findOrFail($command->userId);
+
+        // Make sure the current user is allowed to edit the user profile.
+        // This will let admins and the user themselves pass through, and
+        // throw an exception otherwise.
+        $user->assertCan($command->actor, 'edit');
+
+        $avatarPath = $user->avatar_path;
+        $user->changeAvatarPath(null);
+
+        event(new AvatarWillBeDeleted($user, $command));
+
+        $this->uploadDir->delete($avatarPath);
+
+        $user->save();
+        $this->dispatchEventsFor($user);
+
+        return $user;
+    }
+}

src/Core/Handlers/Commands/UploadAvatarCommandHandler.php

@@ -47,6 +47,8 @@ class UploadAvatarCommandHandler
             'target' => $this->uploadDir,
         ]);
 
+        // @todo delete old avatar
+
         $user->changeAvatarPath($uploadName);
 
         event(new AvatarWillBeUploaded($user, $command));