Allow LiteLLM usage with or without api key

Author: welcoMattic

examples/.env

@@ -114,6 +114,7 @@ LMSTUDIO_HOST_URL=http://127.0.0.1:1234
 
 # For using LiteLLM
 LITELLM_HOST_URL=http://127.0.0.1:4000
+LITELLM_API_KEY=sk-1234
 
 # Qdrant (store)
 QDRANT_HOST=http://127.0.0.1:6333

examples/litellm/chat.php

@@ -15,7 +15,7 @@
 
 require_once dirname(__DIR__).'/bootstrap.php';
 
-$platform = PlatformFactory::create(env('LITELLM_HOST_URL'), http_client());
+$platform = PlatformFactory::create(env('LITELLM_HOST_URL'), env('LITELLM_API_KEY'), http_client());
 
 $messages = new MessageBag(
     Message::forSystem('You are a pirate and you write funny.'),

src/platform/src/Bridge/LiteLlm/ModelClient.php

@@ -27,6 +27,7 @@ final class ModelClient implements ModelClientInterface
     public function __construct(
         HttpClientInterface $httpClient,
         private readonly string $hostUrl,
+        private readonly ?string $apiKey = null,
     ) {
         $this->httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
     }
@@ -38,8 +39,13 @@ public function supports(Model $model): bool
 
     public function request(Model $model, array|string $payload, array $options = []): RawHttpResult
     {
+        $authorizationHeader = null !== $this->apiKey ? ['Authorization' => 'Bearer '.$this->apiKey] : [];
+
         return new RawHttpResult($this->httpClient->request('POST', \sprintf('%s/v1/chat/completions', $this->hostUrl), [
             'json' => array_merge($options, $payload),
+            'headers' => [
+                ...$authorizationHeader,
+            ],
         ]));
     }
 }

src/platform/src/Bridge/LiteLlm/PlatformFactory.php

@@ -25,6 +25,7 @@ class PlatformFactory
 {
     public static function create(
         string $hostUrl = 'http://localhost:4000',
+        ?string $apiKey = null,
         ?HttpClientInterface $httpClient = null,
         ModelCatalogInterface $modelCatalog = new ModelCatalog(),
         ?Contract $contract = null,
@@ -34,7 +35,7 @@ public static function create(
 
         return new Platform(
             [
-                new ModelClient($httpClient, $hostUrl),
+                new ModelClient($httpClient, $hostUrl, $apiKey),
             ],
             [
                 new ResultConverter(),