Test mailgun connection before storing credentials into the app

src/Domain/Settings/Actions/TestSMTPConnectionAction.php

@@ -0,0 +1,47 @@
+<?php
+namespace Domain\Settings\Actions;
+
+use Mail;
+use Domain\Settings\Mail\TestMail;
+use Symfony\Component\Mailer\Exception\LogicException;
+use Symfony\Component\Mailer\Exception\TransportException;
+
+class TestSMTPConnectionAction
+{
+    /**
+     * Throw an Exception if connection isn't successful.
+     *
+     * @return never
+     */
+    public function __invoke(array $credentials)
+    {
+        try {
+            // Set temporary mail connection
+            config(['mail' => [
+                'driver'       => 'smtp',
+                'host'         => $credentials['host'],
+                'port'         => $credentials['port'],
+                'username'     => $credentials['username'],
+                'password'     => $credentials['password'],
+                'encryption'   => $credentials['encryption'] ?? '',
+                'from'         => [
+                    'address' => $credentials['email'] ?? $credentials['username'],
+                    'name'    => $credentials['email'] ?? $credentials['username'],
+                ],
+            ]]);
+
+            $sender = $credentials['email'] ?? $credentials['username'];
+
+            // Send test email
+            Mail::to('test@hi5ve.digital')->send(new TestMail($sender));
+        } catch (TransportException | LogicException $error) {
+            abort(
+                response()->json([
+                    'type'    => 'mailer-connection-error',
+                    'title'   => 'Mail Connection Error',
+                    'message' => $error->getMessage(),
+                ], 401)
+            );
+        }
+    }
+}