feat: open contract for more flexible normalizer configuration (#372)

Could fix part of #371 - the question for flexibility.

Why? Messages are given on platform calls and are given with the
`MessageInterface`. So it is very flexible what could be given on call.
Normalizers are only configured once, internally. So one side is highly
flexible, the other side not.

Giving the contract an interface allows creating own contracts with
whatever backed technology one wants. So more flexible. Additionally it
allows to add a contract that has an amount of normalizers one wants.
For making it easier i thought about having model contract sets. I did
it for anthropic, google and the platform itself.

So a custom contract could look like

```php

use PhpLlm\LlmChain\Platform\Bridge\OpenAI\PlatformFactory;
use PhpLlm\LlmChain\Platform\Contract;

$platform = PlatformFactory::create(
    'my-api-key',
    contract: Contract::create(new MyOwnMessageBagNormalizer(), new MyOwnMessageThingyNormalizer()),
);
```

or, totally flexible:

```php
use PhpLlm\LlmChain\Platform\Bridge\OpenAI\PlatformFactory;

$platform = PlatformFactory::create(
    'my-api-key',
    contract: new MyVeryOwnContractUtilizingJsonStreamer(),
);
```

Maybe this could be a way for more flexibility with the combination of
non configurable normalizer and "unknown" message input?

Author: DZunke

src/Platform/Bridge/Anthropic/Contract/AnthropicContract.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract;
+
+use PhpLlm\LlmChain\Platform\Contract;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+
+/**
+ * @author Denis Zunke <[email protected]>
+ */
+final readonly class AnthropicContract extends Contract
+{
+    public static function create(NormalizerInterface ...$normalizer): Contract
+    {
+        return parent::create(
+            new AssistantMessageNormalizer(),
+            new DocumentNormalizer(),
+            new DocumentUrlNormalizer(),
+            new ImageNormalizer(),
+            new ImageUrlNormalizer(),
+            new MessageBagNormalizer(),
+            new ToolCallMessageNormalizer(),
+            new ToolNormalizer(),
+            ...$normalizer,
+        );
+    }
+}

src/Platform/Bridge/Anthropic/PlatformFactory.php

@@ -4,14 +4,7 @@
 
 namespace PhpLlm\LlmChain\Platform\Bridge\Anthropic;
 
-use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\AssistantMessageNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\DocumentNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\DocumentUrlNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\ImageNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\ImageUrlNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\MessageBagNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\ToolCallMessageNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\ToolNormalizer;
+use PhpLlm\LlmChain\Platform\Bridge\Anthropic\Contract\AnthropicContract;
 use PhpLlm\LlmChain\Platform\Contract;
 use PhpLlm\LlmChain\Platform\Platform;
 use Symfony\Component\HttpClient\EventSourceHttpClient;
@@ -27,22 +20,14 @@ public static function create(
         string $apiKey,
         string $version = '2023-06-01',
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
 
         return new Platform(
             [new ModelClient($httpClient, $apiKey, $version)],
             [new ResponseConverter()],
-            Contract::create(
-                new AssistantMessageNormalizer(),
-                new DocumentNormalizer(),
-                new DocumentUrlNormalizer(),
-                new ImageNormalizer(),
-                new ImageUrlNormalizer(),
-                new MessageBagNormalizer(),
-                new ToolCallMessageNormalizer(),
-                new ToolNormalizer(),
-            )
+            $contract ?? AnthropicContract::create(),
         );
     }
 }

src/Platform/Bridge/Azure/Meta/PlatformFactory.php

@@ -4,6 +4,7 @@
 
 namespace PhpLlm\LlmChain\Platform\Bridge\Azure\Meta;
 
+use PhpLlm\LlmChain\Platform\Contract;
 use PhpLlm\LlmChain\Platform\Platform;
 use Symfony\Component\HttpClient\HttpClient;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
@@ -18,9 +19,10 @@ public static function create(
         #[\SensitiveParameter]
         string $apiKey,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $modelClient = new LlamaHandler($httpClient ?? HttpClient::create(), $baseUrl, $apiKey);
 
-        return new Platform([$modelClient], [$modelClient]);
+        return new Platform([$modelClient], [$modelClient], $contract);
     }
 }

src/Platform/Bridge/Azure/OpenAI/PlatformFactory.php

@@ -24,6 +24,7 @@ public static function create(
         #[\SensitiveParameter]
         string $apiKey,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
         $embeddingsResponseFactory = new EmbeddingsModelClient($httpClient, $baseUrl, $deployment, $apiVersion, $apiKey);
@@ -33,7 +34,7 @@ public static function create(
         return new Platform(
             [$GPTResponseFactory, $embeddingsResponseFactory, $whisperResponseFactory],
             [new ResponseConverter(), new Embeddings\ResponseConverter(), new \PhpLlm\LlmChain\Platform\Bridge\OpenAI\Whisper\ResponseConverter()],
-            Contract::create(new AudioNormalizer()),
+            $contract ?? Contract::create(new AudioNormalizer()),
         );
     }
 }

src/Platform/Bridge/Bedrock/PlatformFactory.php

@@ -8,6 +8,7 @@
 use PhpLlm\LlmChain\Platform\Bridge\Bedrock\Anthropic\ClaudeHandler;
 use PhpLlm\LlmChain\Platform\Bridge\Bedrock\Meta\LlamaModelClient;
 use PhpLlm\LlmChain\Platform\Bridge\Bedrock\Nova\NovaHandler;
+use PhpLlm\LlmChain\Platform\Contract;
 
 /**
  * @author Björn Altmann
@@ -16,11 +17,12 @@
 {
     public static function create(
         BedrockRuntimeClient $bedrockRuntimeClient = new BedrockRuntimeClient(),
+        ?Contract $contract = null,
     ): Platform {
         $modelClient[] = new ClaudeHandler($bedrockRuntimeClient);
         $modelClient[] = new NovaHandler($bedrockRuntimeClient);
         $modelClient[] = new LlamaModelClient($bedrockRuntimeClient);
 
-        return new Platform($modelClient);
+        return new Platform($modelClient, $contract);
     }
 }

src/Platform/Bridge/Google/Contract/GoogleContract.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain\Platform\Bridge\Google\Contract;
+
+use PhpLlm\LlmChain\Platform\Contract;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+
+/**
+ * @author Denis Zunke <[email protected]>
+ */
+final readonly class GoogleContract extends Contract
+{
+    public static function create(NormalizerInterface ...$normalizer): Contract
+    {
+        return parent::create(
+            new AssistantMessageNormalizer(),
+            new MessageBagNormalizer(),
+            new ToolNormalizer(),
+            new ToolCallMessageNormalizer(),
+            new UserMessageNormalizer(),
+            ...$normalizer,
+        );
+    }
+}

src/Platform/Bridge/Google/PlatformFactory.php

@@ -4,11 +4,7 @@
 
 namespace PhpLlm\LlmChain\Platform\Bridge\Google;
 
-use PhpLlm\LlmChain\Platform\Bridge\Google\Contract\AssistantMessageNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Google\Contract\MessageBagNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Google\Contract\ToolCallMessageNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Google\Contract\ToolNormalizer;
-use PhpLlm\LlmChain\Platform\Bridge\Google\Contract\UserMessageNormalizer;
+use PhpLlm\LlmChain\Platform\Bridge\Google\Contract\GoogleContract;
 use PhpLlm\LlmChain\Platform\Bridge\Google\Embeddings\ModelClient;
 use PhpLlm\LlmChain\Platform\Contract;
 use PhpLlm\LlmChain\Platform\Platform;
@@ -24,17 +20,16 @@ public static function create(
         #[\SensitiveParameter]
         string $apiKey,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
         $responseHandler = new ModelHandler($httpClient, $apiKey);
         $embeddings = new ModelClient($httpClient, $apiKey);
 
-        return new Platform([$responseHandler, $embeddings], [$responseHandler, $embeddings], Contract::create(
-            new AssistantMessageNormalizer(),
-            new MessageBagNormalizer(),
-            new ToolNormalizer(),
-            new ToolCallMessageNormalizer(),
-            new UserMessageNormalizer(),
-        ));
+        return new Platform(
+            [$responseHandler, $embeddings],
+            [$responseHandler, $embeddings],
+            $contract ?? GoogleContract::create(),
+        );
     }
 }

src/Platform/Bridge/HuggingFace/PlatformFactory.php

@@ -21,13 +21,14 @@ public static function create(
         string $apiKey,
         string $provider = Provider::HF_INFERENCE,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
 
         return new Platform(
             [new ModelClient($httpClient, $provider, $apiKey)],
             [new ResponseConverter()],
-            Contract::create(
+            $contract ?? Contract::create(
                 new FileNormalizer(),
                 new MessageBagNormalizer(),
             ),

src/Platform/Bridge/Mistral/PlatformFactory.php

@@ -23,13 +23,14 @@ public static function create(
         #[\SensitiveParameter]
         string $apiKey,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
 
         return new Platform(
             [new EmbeddingsModelClient($httpClient, $apiKey), new MistralModelClient($httpClient, $apiKey)],
             [new EmbeddingsResponseConverter(), new MistralResponseConverter()],
-            Contract::create(new ToolNormalizer()),
+            $contract ?? Contract::create(new ToolNormalizer()),
         );
     }
 }

src/Platform/Bridge/Ollama/PlatformFactory.php

@@ -4,6 +4,7 @@
 
 namespace PhpLlm\LlmChain\Platform\Bridge\Ollama;
 
+use PhpLlm\LlmChain\Platform\Contract;
 use PhpLlm\LlmChain\Platform\Platform;
 use Symfony\Component\HttpClient\EventSourceHttpClient;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
@@ -16,10 +17,11 @@ final class PlatformFactory
     public static function create(
         string $hostUrl = 'http://localhost:11434',
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
         $handler = new LlamaModelHandler($httpClient, $hostUrl);
 
-        return new Platform([$handler], [$handler]);
+        return new Platform([$handler], [$handler], $contract);
     }
 }

src/Platform/Bridge/OpenAI/PlatformFactory.php

@@ -26,6 +26,7 @@ public static function create(
         #[\SensitiveParameter]
         string $apiKey,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
 
@@ -44,7 +45,7 @@ public static function create(
                 $dallEModelClient,
                 new WhisperResponseConverter(),
             ],
-            Contract::create(new AudioNormalizer()),
+            $contract ?? Contract::create(new AudioNormalizer()),
         );
     }
 }

src/Platform/Bridge/OpenRouter/PlatformFactory.php

@@ -21,14 +21,19 @@ public static function create(
         #[\SensitiveParameter]
         string $apiKey,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
         $handler = new Client($httpClient, $apiKey);
 
-        return new Platform([$handler], [$handler], Contract::create(
-            new AssistantMessageNormalizer(),
-            new MessageBagNormalizer(),
-            new UserMessageNormalizer(),
-        ));
+        return new Platform(
+            [$handler],
+            [$handler],
+            $contract ?? Contract::create(
+                new AssistantMessageNormalizer(),
+                new MessageBagNormalizer(),
+                new UserMessageNormalizer(),
+            ),
+        );
     }
 }

src/Platform/Bridge/Replicate/PlatformFactory.php

@@ -20,11 +20,12 @@ public static function create(
         #[\SensitiveParameter]
         string $apiKey,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         return new Platform(
             [new LlamaModelClient(new Client($httpClient ?? HttpClient::create(), new Clock(), $apiKey))],
             [new LlamaResponseConverter()],
-            Contract::create(new LlamaMessageBagNormalizer()),
+            $contract ?? Contract::create(new LlamaMessageBagNormalizer()),
         );
     }
 }

src/Platform/Bridge/Voyage/PlatformFactory.php

@@ -4,6 +4,7 @@
 
 namespace PhpLlm\LlmChain\Platform\Bridge\Voyage;
 
+use PhpLlm\LlmChain\Platform\Contract;
 use PhpLlm\LlmChain\Platform\Platform;
 use Symfony\Component\HttpClient\EventSourceHttpClient;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
@@ -17,10 +18,11 @@ public static function create(
         #[\SensitiveParameter]
         string $apiKey,
         ?HttpClientInterface $httpClient = null,
+        ?Contract $contract = null,
     ): Platform {
         $httpClient = $httpClient instanceof EventSourceHttpClient ? $httpClient : new EventSourceHttpClient($httpClient);
         $handler = new ModelHandler($httpClient, $apiKey);
 
-        return new Platform([$handler], [$handler]);
+        return new Platform([$handler], [$handler], $contract);
     }
 }

src/Platform/Contract.php

@@ -23,12 +23,12 @@
 /**
  * @author Christopher Hertel <[email protected]>
  */
-final readonly class Contract
+readonly class Contract
 {
     public const CONTEXT_MODEL = 'model';
 
-    public function __construct(
-        private NormalizerInterface $normalizer,
+    final public function __construct(
+        protected NormalizerInterface $normalizer,
     ) {
     }
 
@@ -63,7 +63,7 @@ public static function create(NormalizerInterface ...$normalizer): self
      *
      * @return array<string, mixed>|string
      */
-    public function createRequestPayload(Model $model, object|array|string $input): string|array
+    final public function createRequestPayload(Model $model, object|array|string $input): string|array
     {
         return $this->normalizer->normalize($input, context: [self::CONTEXT_MODEL => $model]);
     }
@@ -73,7 +73,7 @@ public function createRequestPayload(Model $model, object|array|string $input):
      *
      * @return array<string, mixed>
      */
-    public function createToolOption(array $tools, Model $model): array
+    final public function createToolOption(array $tools, Model $model): array
     {
         return $this->normalizer->normalize($tools, context: [self::CONTEXT_MODEL => $model, AbstractObjectNormalizer::PRESERVE_EMPTY_OBJECTS => true]);
     }