# mxchat-basic/2.2.0/includes/class-mxchat-utils.php MxChat – AI Chatbot & Content Generation for WordPress, version 2.2.0. 197 lines. - Page: https://pluginprobe.com/plugins/mxchat-basic/2.2.0/code/includes/class-mxchat-utils.php - Raw: https://pluginprobe.com/plugins/mxchat-basic/2.2.0/raw/includes/class-mxchat-utils.php - Modified: 2025-05-11T12:51:58+00:00 Line numbers below start at 1. Link to a line or a range by appending a fragment to the page URL, for example `https://pluginprobe.com/plugins/mxchat-basic/2.2.0/code/includes/class-mxchat-utils.php#L10-L20`. ```php prefix . 'mxchat_system_prompt_content'; error_log('[MXCHAT-DB] Starting database submission for URL: ' . $source_url); error_log('[MXCHAT-DB] Content length: ' . strlen($content) . ' bytes'); // Sanitize the source URL $source_url = esc_url_raw($source_url); // Use wpdb's prepare to ensure content is properly escaped for database $prepared_content = $wpdb->prepare('%s', $content); // Remove the quotes that wpdb->prepare adds $safe_content = substr($prepared_content, 1, -1); // Additional content safety measures $safe_content = wp_check_invalid_utf8($safe_content); $safe_content = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]/u', '', $safe_content); // Generate the embedding using the API key $embedding_vector = self::generate_embedding($content, $api_key); if (!is_array($embedding_vector)) { error_log('[MXCHAT-DB] Error: Embedding generation failed'); return false; } error_log('[MXCHAT-DB] Embedding generated successfully'); $embedding_vector_serialized = maybe_serialize($embedding_vector); error_log('[MXCHAT-DB] Serialized embedding length: ' . strlen($embedding_vector_serialized) . ' bytes'); // Check if a row already exists for this URL $existing_id = $wpdb->get_var( $wpdb->prepare( "SELECT id FROM {$table_name} WHERE source_url = %s LIMIT 1", $source_url ) ); // Progressive fallback mechanism for problematic content $attempt = 1; $max_attempts = 3; $current_content = $safe_content; $result = false; while ($attempt <= $max_attempts && $result === false) { try { if ($existing_id) { error_log('[MXCHAT-DB] Found existing entry (ID: ' . $existing_id . '). Updating... (Attempt ' . $attempt . ')'); // Update the existing row $result = $wpdb->update( $table_name, array( 'url' => $source_url, 'article_content' => $current_content, 'embedding_vector' => $embedding_vector_serialized, 'source_url' => $source_url, 'timestamp' => current_time('mysql'), ), array('id' => $existing_id), array('%s','%s','%s','%s','%s'), array('%d') ); } else { error_log('[MXCHAT-DB] No existing entry found. Inserting new row... (Attempt ' . $attempt . ')'); error_log('[MXCHAT-DB] Content sample: ' . substr($current_content, 0, 1000)); // Insert a new row $result = $wpdb->insert( $table_name, array( 'url' => $source_url, 'article_content' => $current_content, 'embedding_vector' => $embedding_vector_serialized, 'source_url' => $source_url, 'timestamp' => current_time('mysql'), ), array('%s','%s','%s','%s','%s') ); } if ($result === false) { error_log('[MXCHAT-DB] Database operation failed (Attempt ' . $attempt . '): ' . $wpdb->last_error); // Progressively apply more aggressive sanitization on failure if ($attempt === 1) { // First fallback: Use a more aggressive character filter and shorten $current_content = preg_replace('/[^\p{L}\p{N}\s.,;:!?()-]/u', '', $current_content); $current_content = substr($current_content, 0, 50000); } else if ($attempt === 2) { // Second fallback: Keep only alphanumeric and basic punctuation, shorten further $current_content = preg_replace('/[^a-zA-Z0-9\s.,;:!?()-]/u', '', $current_content); $current_content = substr($current_content, 0, 30000); } $attempt++; } } catch (Exception $e) { error_log('[MXCHAT-DB] Exception during database operation: ' . $e->getMessage()); $attempt++; } } if ($result === false) { error_log('[MXCHAT-DB] All database operation attempts failed'); return false; } error_log('[MXCHAT-DB] Database operation completed successfully (Attempt ' . ($attempt - 1) . ')'); return true; } /** * Generate an embedding for the given text using the specified API key. * * @param string $text The text to be embedded. * @param string $api_key The API key used for generating embeddings. * @return array|null The embedding vector or null on failure. */ private static function generate_embedding($text, $api_key) { // Get options and selected model $options = get_option('mxchat_options'); $selected_model = $options['embedding_model'] ?? 'text-embedding-ada-002'; // Determine endpoint and API key based on model if (strpos($selected_model, 'voyage') === 0) { $endpoint = 'https://api.voyageai.com/v1/embeddings'; $api_key = $options['voyage_api_key'] ?? ''; } else { $endpoint = 'https://api.openai.com/v1/embeddings'; // Use the passed API key for OpenAI } // Prepare request body $request_body = [ 'input' => $text, 'model' => $selected_model ]; // Add output_dimension for voyage-3-large if ($selected_model === 'voyage-3-large') { $request_body['output_dimension'] = 2048; } $args = [ 'body' => wp_json_encode($request_body), 'headers' => [ 'Content-Type' => 'application/json', 'Authorization' => 'Bearer ' . $api_key, ], 'timeout' => 60, 'redirection' => 5, 'blocking' => true, 'httpversion' => '1.0', 'sslverify' => true, ]; $response = wp_remote_post($endpoint, $args); if (is_wp_error($response)) { error_log('Error generating embedding: ' . $response->get_error_message()); return null; } $response_body = json_decode(wp_remote_retrieve_body($response), true); if (isset($response_body['data'][0]['embedding']) && is_array($response_body['data'][0]['embedding'])) { return $response_body['data'][0]['embedding']; } else { error_log('Invalid response received from embedding API: ' . wp_json_encode($response_body)); return null; } } } ```