[Platform][VertexAI] Add support for API key authentication

Author: Nico Hiort af Ornäs

src/platform/src/Bridge/VertexAi/Embeddings/ModelClient.php

@@ -26,6 +26,7 @@ public function __construct(
         private readonly HttpClientInterface $httpClient,
         private readonly string $location,
         private readonly string $projectId,
+        private readonly ?string $apiKey = null,
     ) {
     }
 
@@ -47,6 +48,10 @@ public function request(BaseModel $model, array|string $payload, array $options
             'predict',
         );
 
+        if (null !== $this->apiKey) {
+            $url .= '?key=' . $this->apiKey;
+        }
+
         $modelOptions = $model->getOptions();
 
         $payload = [

src/platform/src/Bridge/VertexAi/Gemini/ModelClient.php

@@ -30,6 +30,7 @@ public function __construct(
         HttpClientInterface $httpClient,
         private readonly string $location,
         private readonly string $projectId,
+        private readonly ?string $apiKey = null,
     ) {
         $this->httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
     }
@@ -52,6 +53,10 @@ public function request(BaseModel $model, array|string $payload, array $options
             $options['stream'] ?? false ? 'streamGenerateContent' : 'generateContent',
         );
 
+        if (null !== $this->apiKey) {
+            $url .= '?key=' . $this->apiKey;
+        }
+
         if (isset($options[PlatformSubscriber::RESPONSE_FORMAT]['json_schema']['schema'])) {
             $options['generationConfig']['responseMimeType'] = 'application/json';
             $options['generationConfig']['responseSchema'] = $options[PlatformSubscriber::RESPONSE_FORMAT]['json_schema']['schema'];

src/platform/src/Bridge/VertexAi/PlatformFactory.php

@@ -33,6 +33,7 @@ final class PlatformFactory
     public static function create(
         string $location,
         string $projectId,
+        ?string $apiKey = null,
         ?HttpClientInterface $httpClient = null,
         ModelCatalogInterface $modelCatalog = new ModelCatalog(),
         ?Contract $contract = null,
@@ -45,7 +46,7 @@ public static function create(
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
 
         return new Platform(
-            [new GeminiModelClient($httpClient, $location, $projectId), new EmbeddingsModelClient($httpClient, $location, $projectId)],
+            [new GeminiModelClient($httpClient, $location, $projectId, $apiKey), new EmbeddingsModelClient($httpClient, $location, $projectId, $apiKey)],
             [new GeminiResultConverter(), new EmbeddingsResultConverter()],
             $modelCatalog,
             $contract ?? GeminiContract::create(),