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<?php |
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|
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namespace Better_Payment\Lite\AI\Providers; |
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|
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use Better_Payment\Lite\AI\Contracts\AIProviderInterface; |
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|
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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/** |
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* Shared plumbing for HTTP-based AI providers. |
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* |
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* Follows the plugin's existing outbound-request idiom (see |
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* Blocks/BlockActions.php): wp_remote_post + is_wp_error + wp_remote_retrieve_body |
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* + json_decode. Concrete providers implement only the request/response mapping |
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* for their API. |
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* |
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* @see AIProviderInterface |
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*/ |
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abstract class AbstractProvider implements AIProviderInterface { |
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|
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/** |
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* Provider configuration. |
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* |
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* @var array { |
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* @type string $api_key |
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* @type string $model |
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* @type string $image_model |
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* @type float $temperature |
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* @type int $max_tokens |
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* } |
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*/ |
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protected array $config; |
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|
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/** |
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* @param array $config |
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*/ |
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public function __construct( array $config = [] ) { |
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$this->config = wp_parse_args( $config, [ |
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'api_key' => '', |
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'model' => '', |
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'image_model' => '', |
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'temperature' => 0.7, |
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'max_tokens' => 4096, |
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] ); |
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} |
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|
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public function is_configured(): bool { |
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return '' !== trim( (string) $this->config['api_key'] ); |
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} |
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|
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public function supports_images(): bool { |
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return false; |
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} |
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|
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public function generate_image( string $prompt, array $options = [] ): array { |
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return [ 'error' => __( 'This provider does not support image generation.', 'better-payment' ) ]; |
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} |
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|
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/** |
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* Resolve the model id for a chat request (option override → config → first known). |
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*/ |
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protected function resolve_model( array $options ): string { |
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if ( ! empty( $options['model'] ) ) { |
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return (string) $options['model']; |
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} |
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if ( ! empty( $this->config['model'] ) ) { |
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return (string) $this->config['model']; |
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} |
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$models = $this->get_models(); |
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return $models[0] ?? ''; |
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} |
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|
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protected function temperature( array $options ): float { |
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if ( isset( $options['temperature'] ) && is_numeric( $options['temperature'] ) ) { |
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return (float) $options['temperature']; |
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} |
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return (float) $this->config['temperature']; |
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} |
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|
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protected function max_tokens( array $options ): int { |
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if ( isset( $options['max_tokens'] ) && is_numeric( $options['max_tokens'] ) ) { |
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return (int) $options['max_tokens']; |
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} |
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return (int) $this->config['max_tokens']; |
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} |
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|
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/** |
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* Perform a JSON POST and return a normalised result. |
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* |
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* @param string $url |
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* @param array $headers |
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* @param array $body Encoded with wp_json_encode. |
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* @param int $timeout |
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* @return array { |
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* @type bool $ok |
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* @type int $status |
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* @type array|mixed $data Decoded JSON body (assoc array) on success. |
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* @type string|null $error |
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* } |
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*/ |
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protected function post_json( string $url, array $headers, array $body, int $timeout = 60 ): array { |
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$headers = wp_parse_args( $headers, [ 'Content-Type' => 'application/json' ] ); |
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|
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$response = wp_remote_post( $url, [ |
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'headers' => $headers, |
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'body' => wp_json_encode( $body ), |
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'timeout' => $timeout, |
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] ); |
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|
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if ( is_wp_error( $response ) ) { |
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return [ 'ok' => false, 'status' => 0, 'data' => null, 'error' => $response->get_error_message() ]; |
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} |
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|
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$status = (int) wp_remote_retrieve_response_code( $response ); |
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$raw = wp_remote_retrieve_body( $response ); |
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$data = json_decode( $raw, true ); |
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|
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if ( $status < 200 || $status >= 300 ) { |
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return [ |
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'ok' => false, |
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'status' => $status, |
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'data' => $data, |
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'error' => self::extract_error_message( $data, $status ), |
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]; |
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} |
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|
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return [ 'ok' => true, 'status' => $status, 'data' => $data, 'error' => null ]; |
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} |
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|
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/** |
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* Best-effort extraction of an API error message from a decoded body. |
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* |
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* @param mixed $data |
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*/ |
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protected static function extract_error_message( $data, int $status ): string { |
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if ( is_array( $data ) ) { |
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if ( isset( $data['error']['message'] ) ) { |
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return (string) $data['error']['message']; |
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} |
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if ( isset( $data['error'] ) && is_string( $data['error'] ) ) { |
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return $data['error']; |
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} |
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if ( isset( $data['message'] ) && is_string( $data['message'] ) ) { |
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return $data['message']; |
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} |
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} |
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/* translators: %d: HTTP status code. */ |
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return sprintf( __( 'AI provider request failed (HTTP %d).', 'better-payment' ), $status ); |
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} |
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|
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/** |
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* Convert a provider-agnostic tool param map (OperationRegistry shape) into a |
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* JSON-Schema object, shared by all function/tool-calling providers. |
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* |
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* @param array $params [ key => [ 'type' => ..., 'required' => bool, 'summary' => ... ] ] |
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* @return array{type: string, properties: array, required: array} |
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*/ |
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protected static function params_to_json_schema( array $params ): array { |
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$properties = []; |
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$required = []; |
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|
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foreach ( $params as $key => $spec ) { |
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$type = $spec['type'] ?? 'string'; |
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$prop = [ 'description' => $spec['summary'] ?? '' ]; |
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|
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switch ( $type ) { |
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case 'array': |
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$prop['type'] = 'array'; |
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$prop['items'] = [ 'type' => 'object' ]; |
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break; |
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case 'object': |
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$prop['type'] = 'object'; |
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break; |
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case 'integer': |
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$prop['type'] = 'integer'; |
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break; |
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case 'number': |
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$prop['type'] = 'number'; |
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break; |
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case 'mixed': |
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// Leave type open — accept any JSON value. |
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break; |
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default: |
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$prop['type'] = 'string'; |
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} |
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|
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$properties[ $key ] = $prop; |
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if ( ! empty( $spec['required'] ) ) { |
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$required[] = $key; |
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} |
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} |
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|
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return [ |
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'type' => 'object', |
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'properties' => empty( $properties ) ? (object) [] : $properties, |
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'required' => $required, |
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]; |
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} |
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|
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/** |
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* Decode a tool-call arguments payload that may arrive as a JSON string or array. |
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* |
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* @param mixed $arguments |
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* @return array |
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*/ |
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protected static function decode_arguments( $arguments ): array { |
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if ( is_array( $arguments ) ) { |
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return $arguments; |
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} |
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if ( is_string( $arguments ) && '' !== $arguments ) { |
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$decoded = json_decode( $arguments, true ); |
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return is_array( $decoded ) ? $decoded : []; |
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} |
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return []; |
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} |
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|
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/** |
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* Split normalised messages into a system prompt + non-system turns. |
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* Providers that carry the system prompt separately use this. |
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* |
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* @param array $messages |
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* @param string $system_option Explicit system option (takes precedence). |
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* @return array{0: string, 1: array} [ system, turns ] |
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*/ |
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protected static function split_system( array $messages, string $system_option = '' ): array { |
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$system = $system_option; |
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$turns = []; |
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foreach ( $messages as $message ) { |
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if ( ! is_array( $message ) ) { |
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continue; |
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} |
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$role = $message['role'] ?? 'user'; |
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if ( 'system' === $role ) { |
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$system = trim( $system . "\n" . (string) ( $message['content'] ?? '' ) ); |
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continue; |
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} |
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$turns[] = [ |
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'role' => 'assistant' === $role ? 'assistant' : 'user', |
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'content' => (string) ( $message['content'] ?? '' ), |
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]; |
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} |
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return [ trim( $system ), $turns ]; |
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} |
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} |
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|
