Add constants for message types

src/Appwrite/Platform/Workers/Messaging.php

@@ -67,7 +67,7 @@ class Messaging extends Action
         }
 
         if (!\is_null($payload['message']) && !\is_null($payload['recipients'])) {
-            if ($payload['providerType'] === 'SMS') {
+            if ($payload['providerType'] === MESSAGE_TYPE_SMS) {
                 $this->processInternalSMSMessage(new Document($payload['message']), $payload['recipients']);
             }
         } else {
@@ -155,9 +155,9 @@ class Messaging extends Action
                 $identifiers = $identifiersByProviderId[$providerId];
 
                 $adapter = match ($provider->getAttribute('type')) {
-                    'sms' => $this->sms($provider),
-                    'push' => $this->push($provider),
-                    'email' => $this->email($provider),
+                    MESSAGE_TYPE_SMS => $this->sms($provider),
+                    MESSAGE_TYPE_PUSH => $this->push($provider),
+                    MESSAGE_TYPE_EMAIL  => $this->email($provider),
                     default => throw new Exception(Exception::PROVIDER_INCORRECT_TYPE)
                 };
 
@@ -173,9 +173,9 @@ class Messaging extends Action
                         $messageData->setAttribute('to', $batch);
 
                         $data = match ($provider->getAttribute('type')) {
-                            'sms' => $this->buildSMSMessage($messageData, $provider),
-                            'push' => $this->buildPushMessage($messageData),
-                            'email' => $this->buildEmailMessage($messageData, $provider),
+                            MESSAGE_TYPE_SMS => $this->buildSMSMessage($messageData, $provider),
+                            MESSAGE_TYPE_PUSH => $this->buildPushMessage($messageData),
+                            MESSAGE_TYPE_EMAIL => $this->buildEmailMessage($messageData, $provider),
                             default => throw new Exception(Exception::PROVIDER_INCORRECT_TYPE)
                         };
 
@@ -245,7 +245,7 @@ class Messaging extends Action
         $provider = new Document([
             '$id' => ID::unique(),
             'provider' => $host,
-            'type' => 'sms',
+            'type' => MESSAGE_TYPE_SMS,
             'name' => 'Internal SMS',
             'enabled' => true,
             'credentials' => match ($host) {

src/Appwrite/Utopia/Response/Model/Provider.php

@@ -50,7 +50,7 @@ class Provider extends Model
                 'type' => self::TYPE_STRING,
                 'description' => 'Type of provider.',
                 'default' => '',
-                'example' => 'sms',
+                'example' => MESSAGE_TYPE_SMS,
             ])
             ->addRule('credentials', [
                 'type' => self::TYPE_JSON,