feat(platform): Add support for Google vertex AI

- Adds ai bundle integration

Author: junaidbinfarooq

src/ai-bundle/src/AiBundle.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\AI\AiBundle;
 
+use Google\Auth\ApplicationDefaultCredentials;
 use Symfony\AI\Agent\Agent;
 use Symfony\AI\Agent\AgentInterface;
 use Symfony\AI\Agent\InputProcessor\SystemPromptInputProcessor;
@@ -35,6 +36,8 @@
 use Symfony\AI\Platform\Bridge\Ollama\PlatformFactory as OllamaPlatformFactory;
 use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory as OpenAiPlatformFactory;
 use Symfony\AI\Platform\Bridge\OpenRouter\PlatformFactory as OpenRouterPlatformFactory;
+use Symfony\AI\Platform\Bridge\VertexAi\PlatformFactory as VertexAiPlatformFactory;
+use Symfony\AI\Platform\Exception\RuntimeException;
 use Symfony\AI\Platform\Model;
 use Symfony\AI\Platform\ModelClientInterface;
 use Symfony\AI\Platform\Platform;
@@ -65,6 +68,7 @@
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
 use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\HttpClient\EventSourceHttpClient;
 use Symfony\Component\HttpClient\HttpClient;
 use Symfony\Component\HttpKernel\Bundle\AbstractBundle;
 use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
@@ -244,6 +248,37 @@ private function processPlatformConfig(string $type, array $platform, ContainerB
             return;
         }
 
+        if ('vertexai' === $type && isset($platform['location'], $platform['project_id'])) {
+            if (!class_exists(ApplicationDefaultCredentials::class)) {
+                throw new RuntimeException('For using the Vertex AI platform, google/auth package is required. Try running "composer require google/auth".');
+            }
+
+            $credentials = ApplicationDefaultCredentials::getCredentials([
+                'https://www.googleapis.com/auth/cloud-platform',
+            ]);
+
+            $httpClient = new EventSourceHttpClient(HttpClient::create([
+                'auth_bearer' => $credentials?->fetchAuthToken()['access_token'] ?? null,
+            ]));
+
+            $platformId = 'ai.platform.vertexai';
+            $definition = (new Definition(Platform::class))
+                ->setFactory([VertexAiPlatformFactory::class, 'create'])
+                ->setLazy(true)
+                ->addTag('proxy', ['interface' => PlatformInterface::class])
+                ->setArguments([
+                    $platform['location'],
+                    $platform['project_id'],
+                    $httpClient,
+                    new Reference('ai.platform.contract.vertexai', ContainerInterface::NULL_ON_INVALID_REFERENCE),
+                ])
+                ->addTag('ai.platform');
+
+            $container->setDefinition($platformId, $definition);
+
+            return;
+        }
+
         if ('openai' === $type) {
             $platformId = 'ai.platform.openai';
             $definition = (new Definition(Platform::class))