Add Mailer.

src/Mailer/Mailer.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace Tools\Mailer;
+
+use Cake\Core\Configure;
+use Cake\I18n\I18n;
+use Cake\Mailer\Mailer as CakeMailer;
+
+/**
+ * Allows locale overwrite to send emails in a specific language
+ */
+class Mailer extends CakeMailer {
+
+	protected $locale;
+
+	/**
+	 * @inheritdoc
+	 */
+	public function send($action, $args = [], $headers = []) {
+		$this->fixateLocale();
+
+		$result = parent::send($action, $args, $headers);
+
+		$this->restoreLocale();
+
+		return $result;
+	}
+
+	/**
+	 * Switch to primary locale if applicable.
+	 *
+	 * @return void
+	 */
+	protected function fixateLocale() {
+		$this->locale = I18n::locale();
+
+		$primaryLocale = $this->getPrimaryLocale();
+		if ($primaryLocale && $primaryLocale !== $this->locale) {
+			I18n::locale($primaryLocale);
+		}
+	}
+
+	/**
+	 * Restore to current locale if applicable.
+	 *
+	 * @return void
+	 */
+	protected function restoreLocale() {
+		$primaryLocale = $this->getPrimaryLocale();
+		if ($primaryLocale && $primaryLocale !== $this->locale) {
+			I18n::locale($this->locale);
+		}
+	}
+
+	/**
+	 * Returns the configured default locale.
+	 *
+	 * Can be based on the primary language and the allowed languages (whitelist).
+	 *
+	 * @return string
+	 */
+	protected function getPrimaryLocale() {
+		$primaryLanguage = Configure::read('Config.defaultLanguage');
+		if (Configure::read('Config.defaultLocale')) {
+			return Configure::read('Config.defaultLocale');
+		}
+
+		$primaryLocale = Configure::read('Config.allowedLanguages.' . $primaryLanguage . '.locale');
+		return $primaryLocale;
+	}
+
+}