[EXCEPTION] Add Email related exceptions

src/Util/Exception/EmailException.php

@@ -0,0 +1,47 @@
+<?php
+
+// {{{ License
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+// }}}
+
+/**
+ * Email base exception
+ *
+ * @category  Exception
+ * @package   GNUsocial
+ *
+ * @author    Hugo Sales <hugo@hsal.es>
+ * @copyright 2021 Free Software Foundation, Inc http://www.fsf.org
+ * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
+ */
+
+namespace App\Util\Exception;
+
+class EmailException extends ClientException
+{
+    public function __construct(string $msg = null, int $code = 400)
+    {
+        if ($msg === null) {
+            $msg = $this->defaultMessage();
+        }
+        parent::__construct($msg, $code);
+    }
+
+    protected function defaultMessage(): string
+    {
+        return '';
+    }
+}

src/Util/Exception/EmailTakenException.php

@@ -0,0 +1,53 @@
+<?php
+
+// {{{ License
+
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+
+// }}}
+
+/**
+ * Email taken exception
+ *
+ * @category  Exception
+ * @package   GNUsocial
+ *
+ * @author    Hugo Sales <hugo@hsal.es>
+ * @copyright 2021 Free Software Foundation, Inc http://www.fsf.org
+ * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
+ */
+
+namespace App\Util\Exception;
+
+use function App\Core\I18n\_m;
+use App\Entity\GSActor;
+
+class EmailTakenException extends EmailException
+{
+    public ?GSActor $profile = null;    // the GSActor which occupies the email
+
+    public function __construct(?GSActor $profile = null, ?string $msg = null, int $code = 400)
+    {
+        $this->profile = $profile;
+        parent::__construct($msg, $code);
+    }
+
+    protected function defaultMessage(): string
+    {
+        // TRANS: Validation error in form for registration, profile and group settings, etc.
+        return _m('Email is already in use on this server.');
+    }
+}

src/Util/Exception/NicknameTakenException.php

@@ -20,7 +20,7 @@
 // }}}
 
 /**
- * Nickname empty exception
+ * Nickname taken exception
  *
  * @category  Exception
  * @package   GNUsocial