312 lines
10 KiB
PHP
312 lines
10 KiB
PHP
<?php
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// LocalAIApi — proxy client for the Responses API.
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// Usage:
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// require_once __DIR__ . '/ai/LocalAIApi.php';
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// $response = LocalAIApi::createResponse([
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// 'input' => [
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// ['role' => 'system', 'content' => 'You are a helpful assistant.'],
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// ['role' => 'user', 'content' => 'Tell me a bedtime story.'],
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// ],
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// ]);
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// if (!empty($response['success'])) {
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// $decoded = LocalAIApi::decodeJsonFromResponse($response);
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// }
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class LocalAIApi
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{
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/** @var array<string,mixed>|null */
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private static ?array $configCache = null;
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/**
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* Signature compatible with the OpenAI Responses API.
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*
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* @param array<string,mixed> $params Request body (model, input, text, reasoning, metadata, etc.).
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* @param array<string,mixed> $options Extra options (timeout, verify_tls, headers, path, project_uuid).
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* @return array{
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* success:bool,
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* status?:int,
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* data?:mixed,
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* error?:string,
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* response?:mixed,
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* message?:string
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* }
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*/
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public static function createResponse(array $params, array $options = []): array
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{
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$cfg = self::config();
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$payload = $params;
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if (empty($payload['input']) || !is_array($payload['input'])) {
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return [
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'success' => false,
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'error' => 'input_missing',
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'message' => 'Parameter "input" is required and must be an array.',
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];
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}
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if (!isset($payload['model']) || $payload['model'] === '') {
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$payload['model'] = $cfg['default_model'];
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}
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return self::request($options['path'] ?? null, $payload, $options);
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}
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/**
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* Snake_case alias for createResponse (matches the provided example).
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*
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* @param array<string,mixed> $params
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* @param array<string,mixed> $options
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* @return array<string,mixed>
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*/
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public static function create_response(array $params, array $options = []): array
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{
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return self::createResponse($params, $options);
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}
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/**
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* Perform a raw request to the AI proxy.
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*
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* @param string $path Endpoint (may be an absolute URL).
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* @param array<string,mixed> $payload JSON payload.
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* @param array<string,mixed> $options Additional request options.
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* @return array<string,mixed>
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*/
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public static function request(?string $path = null, array $payload = [], array $options = []): array
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{
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if (!function_exists('curl_init')) {
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return [
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'success' => false,
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'error' => 'curl_missing',
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'message' => 'PHP cURL extension is missing. Install or enable it on the VM.',
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];
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}
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$cfg = self::config();
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$projectUuid = $cfg['project_uuid'];
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if (empty($projectUuid)) {
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return [
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'success' => false,
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'error' => 'project_uuid_missing',
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'message' => 'PROJECT_UUID is not defined; aborting AI request.',
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];
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}
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$defaultPath = $cfg['responses_path'] ?? null;
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$resolvedPath = $path ?? ($options['path'] ?? $defaultPath);
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if (empty($resolvedPath)) {
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return [
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'success' => false,
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'error' => 'project_id_missing',
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'message' => 'PROJECT_ID is not defined; cannot resolve AI proxy endpoint.',
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];
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}
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$url = self::buildUrl($resolvedPath, $cfg['base_url']);
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$baseTimeout = isset($cfg['timeout']) ? (int) $cfg['timeout'] : 30;
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$timeout = isset($options['timeout']) ? (int) $options['timeout'] : $baseTimeout;
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if ($timeout <= 0) {
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$timeout = 30;
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}
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$baseVerifyTls = array_key_exists('verify_tls', $cfg) ? (bool) $cfg['verify_tls'] : true;
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$verifyTls = array_key_exists('verify_tls', $options)
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? (bool) $options['verify_tls']
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: $baseVerifyTls;
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$projectHeader = $cfg['project_header'];
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$headers = [
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'Content-Type: application/json',
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'Accept: application/json',
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];
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$headers[] = $projectHeader . ': ' . $projectUuid;
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if (!empty($options['headers']) && is_array($options['headers'])) {
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foreach ($options['headers'] as $header) {
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if (is_string($header) && $header !== '') {
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$headers[] = $header;
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}
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}
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}
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if (!empty($projectUuid) && !array_key_exists('project_uuid', $payload)) {
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$payload['project_uuid'] = $projectUuid;
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}
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$body = json_encode($payload, JSON_UNESCAPED_UNICODE);
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if ($body === false) {
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return [
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'success' => false,
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'error' => 'json_encode_failed',
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'message' => 'Failed to encode request body to JSON.',
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];
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}
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$ch = curl_init($url);
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curl_setopt($ch, CURLOPT_POST, true);
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curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
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curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
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curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
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curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, $verifyTls);
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curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, $verifyTls ? 2 : 0);
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curl_setopt($ch, CURLOPT_FAILONERROR, false);
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$responseBody = curl_exec($ch);
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if ($responseBody === false) {
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$error = curl_error($ch) ?: 'Unknown cURL error';
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curl_close($ch);
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return [
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'success' => false,
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'error' => 'curl_error',
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'message' => $error,
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];
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}
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$status = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
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curl_close($ch);
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$decoded = null;
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if ($responseBody !== '' && $responseBody !== null) {
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$decoded = json_decode($responseBody, true);
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if (json_last_error() !== JSON_ERROR_NONE) {
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$decoded = null;
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}
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}
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if ($status >= 200 && $status < 300) {
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return [
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'success' => true,
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'status' => $status,
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'data' => $decoded ?? $responseBody,
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];
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}
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$errorMessage = 'AI proxy request failed';
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if (is_array($decoded)) {
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$errorMessage = $decoded['error'] ?? $decoded['message'] ?? $errorMessage;
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} elseif (is_string($responseBody) && $responseBody !== '') {
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$errorMessage = $responseBody;
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}
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return [
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'success' => false,
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'status' => $status,
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'error' => $errorMessage,
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'response' => $decoded ?? $responseBody,
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];
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}
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/**
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* Extract plain text from a Responses API payload.
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*
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* @param array<string,mixed> $response Result of LocalAIApi::createResponse|request.
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* @return string
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*/
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public static function extractText(array $response): string
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{
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$payload = $response['data'] ?? $response;
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if (!is_array($payload)) {
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return '';
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}
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if (!empty($payload['output']) && is_array($payload['output'])) {
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$combined = '';
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foreach ($payload['output'] as $item) {
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if (!isset($item['content']) || !is_array($item['content'])) {
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continue;
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}
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foreach ($item['content'] as $block) {
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if (is_array($block) && ($block['type'] ?? '') === 'output_text' && !empty($block['text'])) {
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$combined .= $block['text'];
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}
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}
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}
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if ($combined !== '') {
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return $combined;
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}
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}
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if (!empty($payload['choices'][0]['message']['content'])) {
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return (string) $payload['choices'][0]['message']['content'];
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}
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return '';
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}
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/**
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* Attempt to decode JSON emitted by the model (handles markdown fences).
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*
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* @param array<string,mixed> $response
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* @return array<string,mixed>|null
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*/
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public static function decodeJsonFromResponse(array $response): ?array
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{
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$text = self::extractText($response);
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if ($text === '') {
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return null;
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}
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$decoded = json_decode($text, true);
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if (is_array($decoded)) {
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return $decoded;
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}
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$stripped = preg_replace('/^```json|```$/m', '', trim($text));
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if ($stripped !== null && $stripped !== $text) {
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$decoded = json_decode($stripped, true);
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if (is_array($decoded)) {
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return $decoded;
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}
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}
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return null;
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}
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/**
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* Load configuration from ai/config.php.
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*
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* @return array<string,mixed>
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*/
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private static function config(): array
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{
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if (self::$configCache === null) {
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$configPath = __DIR__ . '/config.php';
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if (!file_exists($configPath)) {
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throw new RuntimeException('AI config file not found: ai/config.php');
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}
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$cfg = require $configPath;
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if (!is_array($cfg)) {
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throw new RuntimeException('Invalid AI config format: expected array');
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}
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self::$configCache = $cfg;
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}
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return self::$configCache;
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}
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/**
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* Build an absolute URL from base_url and a path.
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*/
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private static function buildUrl(string $path, string $baseUrl): string
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{
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$trimmed = trim($path);
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if ($trimmed === '') {
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return $baseUrl;
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}
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if (str_starts_with($trimmed, 'http://') || str_starts_with($trimmed, 'https://')) {
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return $trimmed;
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}
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if ($trimmed[0] === '/') {
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return $baseUrl . $trimmed;
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}
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return $baseUrl . '/' . $trimmed;
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}
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}
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// Legacy alias for backward compatibility with the previous class name.
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if (!class_exists('OpenAIService')) {
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class_alias(LocalAIApi::class, 'OpenAIService');
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}
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