EditAsset: allow users to edit their own photos

models/Asset.php

@@ -383,6 +383,11 @@ class Asset
 		return new Image(get_object_vars($this));
 	}
 
+	public function isOwnedBy(User $user)
+	{
+		return $this->id_user_uploaded == $user->getUserId();
+	}
+
 	public function replaceFile($filename)
 	{
 		// No filename? Abort!