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<?php |
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|
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namespace AATXT\App\AIProviders\Anthropic; |
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|
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use AATXT\App\AIProviders\AIProviderInterface; |
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use AATXT\App\AIProviders\Contracts\RequiresAuthentication; |
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use AATXT\App\AIProviders\Contracts\SupportsImageValidation; |
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use AATXT\App\Configuration\AIProviderConfig; |
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use AATXT\App\Exceptions\Anthropic\AnthropicException; |
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use AATXT\App\Infrastructure\Http\HttpClientInterface; |
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use AATXT\Config\Constants; |
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|
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/** |
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* Anthropic Claude provider for generating alt text using Claude models. |
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* |
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* Implements SupportsImageValidation and RequiresAuthentication interfaces |
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* following the Interface Segregation Principle. |
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*/ |
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class AnthropicResponse implements AIProviderInterface, SupportsImageValidation, RequiresAuthentication |
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{ |
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/** |
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* @var HttpClientInterface |
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*/ |
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private $httpClient; |
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|
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/** |
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* @var AIProviderConfig |
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*/ |
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private $config; |
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|
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/** |
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* @var AnthropicModelsRegistry|null |
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*/ |
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private $modelsRegistry; |
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|
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/** |
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* Constructor. |
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* |
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* @param HttpClientInterface $httpClient HTTP client for API calls |
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* @param AIProviderConfig $config Configuration with API key, prompt, and model |
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* @param AnthropicModelsRegistry|null $modelsRegistry Optional registry used to fall back |
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* to a currently-available model when the configured one has been retired |
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*/ |
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public function __construct( |
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HttpClientInterface $httpClient, |
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AIProviderConfig $config, |
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?AnthropicModelsRegistry $modelsRegistry = null |
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) { |
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$this->httpClient = $httpClient; |
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$this->config = $config; |
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$this->modelsRegistry = $modelsRegistry; |
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} |
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|
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/** |
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* Get the list of supported MIME types for Anthropic Claude. |
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* |
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* @return array<string> List of supported MIME types |
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*/ |
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public function getSupportedMimeTypes(): array |
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{ |
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return Constants::AATXT_ANTHROPIC_ALLOWED_MIME_TYPES; |
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} |
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|
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/** |
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* Check if a specific MIME type is supported. |
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* |
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* @param string $mimeType The MIME type to check |
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* @return bool True if supported, false otherwise |
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*/ |
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public function supportsImage(string $mimeType): bool |
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{ |
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return in_array($mimeType, $this->getSupportedMimeTypes(), true); |
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} |
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|
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/** |
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* Validate that valid credentials are configured. |
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* |
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* @return bool True if credentials are valid |
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*/ |
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public function validateCredentials(): bool |
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{ |
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$apiKey = $this->config->getApiKey(); |
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return !empty($apiKey) && strlen($apiKey) > 10; |
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} |
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|
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/** |
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* Check if an API key is configured. |
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* |
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* @return bool True if API key is set |
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*/ |
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public function hasApiKey(): bool |
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{ |
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return !empty($this->config->getApiKey()); |
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} |
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|
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/** |
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* Make a request to Anthropic Claude API to retrieve a description for the image passed |
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* |
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* @param string $imageUrl |
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* @return string |
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* @throws AnthropicException |
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*/ |
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public function response(string $imageUrl): string |
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{ |
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$apiKey = $this->config->getApiKey(); |
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|
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if (empty($apiKey)) { |
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throw new AnthropicException('Anthropic API key is missing in plugin settings'); |
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} |
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|
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$payload = [ |
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"model" => $this->resolveModel(), |
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"max_tokens" => 1024, |
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"messages" => [ |
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[ |
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"role" => "user", |
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"content" => [ |
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[ |
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"type" => "image", |
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"source" => [ |
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"type" => "url", |
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"url" => $imageUrl, |
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], |
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], |
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[ |
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"type" => "text", |
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"text" => $this->config->getPrompt(), |
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], |
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], |
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], |
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], |
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]; |
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|
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$headers = [ |
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'Content-Type' => 'application/json', |
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'x-api-key' => $apiKey, |
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'anthropic-version' => Constants::AATXT_API_VERSION, |
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]; |
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|
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try { |
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$data = $this->httpClient->post(Constants::AATXT_ANTHROPIC_ENDPOINT, $headers, $payload); |
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} catch (\Exception $e) { |
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throw new AnthropicException('HTTP request failed: ' . $e->getMessage()); |
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} |
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|
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$answer = $data['content'][0]['text'] ?? null; |
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|
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if (!$answer) { |
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$bodyJson = json_encode($data); |
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throw new AnthropicException('Response format unexpected: ' . $bodyJson); |
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} |
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|
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return $answer; |
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} |
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|
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/** |
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* Return the model id to send to the API, transparently falling back to the |
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* most recent available model when the configured one is no longer listed |
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* by the registry. |
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*/ |
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private function resolveModel(): string |
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{ |
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$configured = $this->config->getModel(); |
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|
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if ($this->modelsRegistry === null || $configured === '') { |
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return $configured; |
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} |
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|
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if ($this->modelsRegistry->isAvailable($configured)) { |
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return $configured; |
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} |
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|
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return $this->modelsRegistry->getDefaultModel(); |
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} |
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} |
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