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| 1 | <?php |
| 2 | /** |
| 3 | * AI Experiments orchestrator. |
| 4 | * |
| 5 | * Manages experiment toggles and delegates to feature classes. |
| 6 | * Each experiment is gated by a filter: jetpack_ai_experiments_{$slug}. |
| 7 | * |
| 8 | * @package automattic/jetpack |
| 9 | */ |
| 10 | |
| 11 | use Automattic\Jetpack\Device_Detection\User_Agent_Info; |
| 12 | |
| 13 | /** |
| 14 | * Orchestrator for the AI Experiments module. |
| 15 | */ |
| 16 | class Jetpack_AI_Experiments { |
| 17 | |
| 18 | /** |
| 19 | * Registered experiments: slug => default enabled state. |
| 20 | * |
| 21 | * @var array<string, bool> |
| 22 | */ |
| 23 | private static $experiments = array( |
| 24 | 'ai_bot_header' => true, |
| 25 | ); |
| 26 | |
| 27 | /** |
| 28 | * Initialize the module. Iterates experiments and wires enabled ones. |
| 29 | */ |
| 30 | public static function init() { |
| 31 | foreach ( self::$experiments as $slug => $default ) { |
| 32 | if ( ! self::is_enabled( $slug ) ) { |
| 33 | continue; |
| 34 | } |
| 35 | |
| 36 | switch ( $slug ) { |
| 37 | case 'ai_bot_header': |
| 38 | add_action( 'send_headers', array( __CLASS__, 'add_ai_bot_header' ) ); |
| 39 | break; |
| 40 | } |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Check whether an experiment is enabled. |
| 46 | * |
| 47 | * @param string $experiment Experiment slug. |
| 48 | * @return bool |
| 49 | */ |
| 50 | public static function is_enabled( $experiment ) { |
| 51 | $default = isset( self::$experiments[ $experiment ] ) ? self::$experiments[ $experiment ] : false; |
| 52 | |
| 53 | /** |
| 54 | * Filter to enable or disable an AI experiment. |
| 55 | * |
| 56 | * The dynamic portion of the hook name, `$experiment`, refers to the experiment slug. |
| 57 | * |
| 58 | * @param bool $enabled Whether the experiment is enabled. |
| 59 | */ |
| 60 | return (bool) apply_filters( "jetpack_ai_experiments_{$experiment}", $default ); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Detect whether the current request is from an AI bot/agent. |
| 65 | * |
| 66 | * Delegates to User_Agent_Info::is_agent() from the device-detection package |
| 67 | * when available, with a hardcoded fallback for environments without it. |
| 68 | * |
| 69 | * @return bool |
| 70 | */ |
| 71 | public static function is_ai_bot() { |
| 72 | if ( class_exists( User_Agent_Info::class ) && method_exists( User_Agent_Info::class, 'is_agent' ) ) { |
| 73 | return User_Agent_Info::is_agent(); |
| 74 | } |
| 75 | |
| 76 | return self::is_ai_bot_fallback(); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Fallback AI bot detection for environments without the device-detection package. |
| 81 | * |
| 82 | * @return bool |
| 83 | */ |
| 84 | private static function is_ai_bot_fallback() { |
| 85 | if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) { |
| 86 | return false; |
| 87 | } |
| 88 | |
| 89 | $ua = sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); |
| 90 | $patterns = array( |
| 91 | 'claudebot', |
| 92 | 'claude-web', |
| 93 | 'anthropic-ai', |
| 94 | 'chatgpt-user', |
| 95 | 'gptbot', |
| 96 | 'oai-searchbot', |
| 97 | 'google-extended', |
| 98 | 'gemini', |
| 99 | 'perplexitybot', |
| 100 | 'cohere-ai', |
| 101 | 'bytespider', |
| 102 | 'ccbot', |
| 103 | ); |
| 104 | |
| 105 | $ua_lower = strtolower( $ua ); |
| 106 | foreach ( $patterns as $pattern ) { |
| 107 | if ( false !== strpos( $ua_lower, $pattern ) ) { |
| 108 | return true; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Send X-AI-Bot response header indicating whether the request is from an AI agent. |
| 117 | */ |
| 118 | public static function add_ai_bot_header() { |
| 119 | if ( headers_sent() ) { |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | header( 'X-AI-Bot: ' . ( self::is_ai_bot() ? 'true' : 'false' ) ); |
| 124 | } |
| 125 | } |