Add MMS support

Author: gregoriohc

README.md

@@ -82,7 +82,30 @@ class AccountApproved extends Notification
 }
 ```
 
-You can also create a Twilio call:
+You can also send an MMS:
+
+``` php
+use NotificationChannels\Twilio\TwilioChannel;
+use NotificationChannels\Twilio\TwilioMmsMessage;
+use Illuminate\Notifications\Notification;
+
+class AccountApproved extends Notification
+{
+    public function via($notifiable)
+    {
+        return [TwilioChannel::class];
+    }
+
+    public function toTwilio($notifiable)
+    {
+        return (new TwilioMmsMessage())
+            ->content("Your {$notifiable->service} account was approved!")
+            ->mediaUrl("https://picsum.photos/300");
+    }
+}
+```
+
+Or create a Twilio call:
 
 ``` php
 use NotificationChannels\Twilio\TwilioChannel;

src/Twilio.php

@@ -70,6 +70,10 @@ protected function sendSmsMessage(TwilioSmsMessage $message, $to)
             'body' => trim($message->content),
         ];
 
+        if ($message instanceof TwilioMmsMessage) {
+            $params['mediaUrl'] = $message->mediaUrl;
+        }
+
         if ($serviceSid = $this->config->getServiceSid()) {
             $params['messagingServiceSid'] = $serviceSid;
         }

src/TwilioMmsMessage.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace NotificationChannels\Twilio;
+
+class TwilioMmsMessage extends TwilioSmsMessage
+{
+    /**
+     * The message media url (for MMS messages).
+     *
+     * @var string
+     */
+    public $mediaUrl;
+
+    /**
+     * Set the alphanumeric sender.
+     *
+     * @param $url
+     */
+    public function mediaUrl($url)
+    {
+        $this->mediaUrl = $url;
+    }
+}

tests/TwilioMmsMessageTest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace NotificationChannels\Twilio\Test;
+
+use NotificationChannels\Twilio\TwilioMmsMessage;
+
+class TwilioMmsMessageTest extends TwilioMessageTest
+{
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->message = new TwilioMmsMessage();
+    }
+
+    /** @test */
+    public function it_can_accept_a_message_when_constructing_a_message()
+    {
+        $message = new TwilioMmsMessage('myMessage');
+
+        $this->assertEquals('myMessage', $message->content);
+    }
+
+    /** @test */
+    public function it_provides_a_create_method()
+    {
+        $message = TwilioMmsMessage::create('myMessage');
+
+        $this->assertEquals('myMessage', $message->content);
+    }
+
+    /** @test */
+    public function it_sets_alphanumeric_sender()
+    {
+        $message = TwilioMmsMessage::create('myMessage');
+        $message->sender('TestSender');
+
+        $this->assertEquals('TestSender', $message->alphaNumSender);
+    }
+
+    /** @test */
+    public function it_sets_media_url()
+    {
+        $message = TwilioMmsMessage::create('myMessage');
+        $message->mediaUrl('https://picsum.photos/300');
+
+        $this->assertEquals('https://picsum.photos/300', $message->mediaUrl);
+    }
+
+    /** @test */
+    public function it_can_return_the_alphanumeric_sender_if_set()
+    {
+        $message = TwilioMmsMessage::create('myMessage');
+        $message->sender('TestSender');
+
+        $this->assertEquals('TestSender', $message->getFrom());
+    }
+}