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<?php |
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/** |
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* Desktop Mode — DevTools / debug bus. |
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* |
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* Provides a generic per-session pub/sub channel that plugins use to |
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* stream debug data (SQL queries, HTTP timings, hook traces, custom |
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* events) from a server-side capture into a client-side inspector |
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* window. |
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* |
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* Architecture: |
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* |
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* 1. Inspector plugin allocates a session id with |
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* `wp.desktop.devtools.debug.startSession()` and decides which |
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* channels it cares about (`'query'`, `'log'`, …). |
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* 2. Inspector contributes `X-WP-Debug-Session: <id>` to the |
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* target window via |
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* `wp.desktop.devtools.addRequestHeader( windowId, 'X-WP-Debug-Session', sessionId )`. |
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* 3. The target window's iframe attaches that header to every |
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* fetch / XHR / sendBeacon (the chromeless inline bridge merges |
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* contributed headers into outgoing requests). |
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* 4. Server-side capture hooks read the header via |
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* {@see desktop_mode_debug_session_for_request()}, run their |
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* capture (SAVEQUERIES, output buffering, etc.), and publish via |
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* {@see desktop_mode_debug_publish()}. |
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* 5. Inspector subscribes via |
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* `wp.desktop.devtools.debug.subscribe( sessionId, channel, cb )`. |
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* The shell polls `GET /desktop-mode/v1/debug` every second and |
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* replays new events to subscribers. |
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* |
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* Storage: a per-session ring buffer in a transient. Bounded by |
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* {@see DESKTOP_MODE_DEBUG_RING_SIZE} so a misconfigured capture |
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* loop can't fill the database. TTL is 1 hour — long enough for an |
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* inspector session to span a few page loads, short enough that |
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* abandoned sessions don't squat indefinitely. |
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* |
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* Capability gate: every public surface requires the caller to be |
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* logged-in AND hold `manage_options`. Debug data leaks request / |
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* response details (query parameters, internal IDs) — locking it to |
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* site admins matches the cost of getting that wrong. |
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* |
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* @since 0.6.0 |
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* |
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* @package WPDesktopMode |
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*/ |
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|
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defined( 'ABSPATH' ) || exit; |
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|
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/** |
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* Maximum number of events kept per (session, channel) ring buffer. |
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* |
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* A 500-event cap means a chatty SQL capture ((100 queries / page) × 5 |
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* page loads) survives on the buffer without truncation. Anything |
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* higher and a single transient row starts to push the row-size |
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* sanity threshold for typical wp_options storage. |
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*/ |
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const DESKTOP_MODE_DEBUG_RING_SIZE = 500; |
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|
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/** |
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* Transient TTL for a session ring buffer, in seconds. |
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* |
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* One hour. Inspector windows that stay open longer than that should |
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* heartbeat by republishing — at which point the TTL extends. |
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*/ |
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const DESKTOP_MODE_DEBUG_SESSION_TTL = 3600; |
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|
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/** |
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* Build the transient key for a (session, channel) pair. |
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* |
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* @since 0.6.0 |
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* |
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* @param string $session_id Session id (as supplied by the client). |
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* @param string $channel Channel name (`'query'`, `'log'`, …). |
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* @return string Transient key safe for `set_transient`. |
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*/ |
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function desktop_mode_debug_transient_key( $session_id, $channel ) { |
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return 'desktop_mode_dbg_' . md5( (string) $session_id . '|' . (string) $channel ); |
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} |
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|
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/** |
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* Read the debug session id from the current request's headers. |
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* |
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* Plugins running inside an admin request (chromeless iframe load, |
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* admin-ajax, REST request) call this to detect whether the request |
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* originated from an instrumented window. Returns an empty string |
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* when no session id is attached or the value fails sanitisation. |
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* |
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* The header is sanitised with `sanitize_key()` — session ids |
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* generated by the JS side (`crypto.randomUUID()` or the legacy |
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* fallback) are alphanumeric + dashes, so this is a tight gate. |
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* |
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* @since 0.6.0 |
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* |
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* @return string Session id, or '' when absent / invalid. |
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*/ |
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function desktop_mode_debug_session_for_request() { |
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$raw = ''; |
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if ( isset( $_SERVER['HTTP_X_WP_DEBUG_SESSION'] ) ) { |
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$raw = sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_WP_DEBUG_SESSION'] ) ); |
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} |
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$raw = trim( $raw ); |
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if ( '' === $raw ) { |
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return ''; |
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} |
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// `sanitize_key()` lowercases — preserve case so UUID v4 strings |
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// round-trip cleanly. Replace anything that isn't alnum/dash. |
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$sanitised = preg_replace( '/[^A-Za-z0-9\-]/', '', $raw ); |
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if ( ! is_string( $sanitised ) || '' === $sanitised || strlen( $sanitised ) > 64 ) { |
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return ''; |
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} |
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return $sanitised; |
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} |
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|
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/** |
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* Publish a payload onto a (session, channel). |
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* |
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* The newest event is appended to the ring buffer; once the cap is |
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* reached, the oldest events are dropped FIFO. Fires the |
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* `desktop_mode_debug_publish` action so observability widgets can |
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* tail the stream synchronously without going through the REST poll. |
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* |
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* @since 0.6.0 |
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* |
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* @param string $session_id Session id from the client. |
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* @param string $channel Channel name. Free-form; convention is |
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* lowercase ASCII (e.g. `'query'`, |
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* `'log'`, `'rest_timing'`). |
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* @param mixed $payload Anything `wp_json_encode()` can serialise. |
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* @return bool True on success, false when storage refused (ring full |
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* and transient API unavailable, etc.). |
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*/ |
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function desktop_mode_debug_publish( $session_id, $channel, $payload ) { |
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$session_id = (string) $session_id; |
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$channel = (string) $channel; |
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if ( '' === $session_id || '' === $channel ) { |
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return false; |
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} |
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$key = desktop_mode_debug_transient_key( $session_id, $channel ); |
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$existing = get_transient( $key ); |
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if ( ! is_array( $existing ) ) { |
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$existing = array( |
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'next_id' => 0, |
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'events' => array(), |
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); |
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} |
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$next_id = isset( $existing['next_id'] ) ? (int) $existing['next_id'] : 0; |
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$next_id++; |
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$existing['next_id'] = $next_id; |
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$existing['events'][] = array( |
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'id' => $next_id, |
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't' => (int) round( microtime( true ) * 1000 ), |
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'channel' => $channel, |
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'payload' => $payload, |
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); |
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$max = (int) apply_filters( 'desktop_mode_debug_ring_size', DESKTOP_MODE_DEBUG_RING_SIZE ); |
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if ( $max < 1 ) { |
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$max = DESKTOP_MODE_DEBUG_RING_SIZE; |
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} |
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if ( count( $existing['events'] ) > $max ) { |
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$existing['events'] = array_slice( $existing['events'], -$max ); |
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} |
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set_transient( $key, $existing, DESKTOP_MODE_DEBUG_SESSION_TTL ); |
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|
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/** |
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* Fires after a debug event is appended to the ring buffer. |
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* |
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* Lets observability hooks tail the stream synchronously instead |
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* of polling the REST endpoint. The arguments mirror the JS-side |
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* `DebugEvent` shape minus the auto-assigned id / timestamp. |
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* |
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* @since 0.6.0 |
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* |
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* @param string $session_id Session id from the publishing call. |
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* @param string $channel Channel name. |
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* @param mixed $payload Published payload (post-filter). |
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*/ |
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do_action( 'desktop_mode_debug_publish', $session_id, $channel, $payload ); |
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return true; |
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} |
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|
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/** |
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* Drain events newer than `$since` for a session, optionally |
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* narrowed to one channel. |
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* |
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* Returns `array( 'events' => [], 'cursor' => N )`. The cursor is the |
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* highest event id seen across all returned events; clients pass it |
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* back as `since` on the next poll. |
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* |
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* @since 0.6.0 |
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* |
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* @param string $session_id Session id. |
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* @param int $since Highest id the client has seen. |
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* @param string|null $channel Optional channel filter. |
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* @return array |
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*/ |
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function desktop_mode_debug_drain( $session_id, $since = 0, $channel = null ) { |
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$session_id = (string) $session_id; |
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if ( '' === $session_id ) { |
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return array( 'events' => array(), 'cursor' => (int) $since ); |
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} |
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|
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$channels = array(); |
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if ( null !== $channel && '' !== (string) $channel ) { |
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$channels[] = (string) $channel; |
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} else { |
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// Without a channel filter the client wants every channel for |
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// this session. We don't keep an index of channels per session |
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// (would double-write on every publish); instead we let the |
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// caller pass a list, OR fan out via the |
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// `desktop_mode_debug_channels` filter for plugins that know |
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// their full set up-front. |
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$declared = apply_filters( 'desktop_mode_debug_channels', array(), $session_id ); |
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if ( is_array( $declared ) ) { |
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foreach ( $declared as $ch ) { |
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if ( is_string( $ch ) && '' !== $ch ) { |
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$channels[] = $ch; |
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} |
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} |
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} |
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} |
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|
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$cursor = (int) $since; |
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$out = array(); |
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foreach ( $channels as $ch ) { |
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$key = desktop_mode_debug_transient_key( $session_id, $ch ); |
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$data = get_transient( $key ); |
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if ( ! is_array( $data ) || empty( $data['events'] ) ) { |
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continue; |
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} |
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foreach ( $data['events'] as $ev ) { |
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if ( ! is_array( $ev ) || ! isset( $ev['id'] ) ) { |
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continue; |
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} |
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if ( (int) $ev['id'] <= (int) $since ) { |
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continue; |
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} |
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$out[] = $ev; |
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if ( (int) $ev['id'] > $cursor ) { |
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$cursor = (int) $ev['id']; |
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} |
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} |
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} |
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|
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// Stable sort by event id so a multi-channel response is in |
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// publication order rather than channel-iteration order. usort() |
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// in PHP 8+ is stable; this matches the JS-side expectation. |
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usort( |
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$out, |
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static function ( $a, $b ) { |
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return ( (int) $a['id'] ) - ( (int) $b['id'] ); |
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} |
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); |
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return array( 'events' => $out, 'cursor' => $cursor ); |
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} |
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|
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/** |
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* REST: GET /desktop-mode/v1/debug |
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* |
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* Returns events newer than `since` for the given session id. |
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* Supports both `channel=foo` (single) and `channels[]=foo&channels[]=bar` |
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* (list); falls back to the `desktop_mode_debug_channels` filter |
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* when no channel param is supplied. |
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* |
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* @since 0.6.0 |
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* |
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* @param WP_REST_Request $request REST request. |
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* @return WP_REST_Response |
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*/ |
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function desktop_mode_rest_debug_drain( WP_REST_Request $request ) { |
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$session_id = (string) $request->get_param( 'sessionId' ); |
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$since = (int) $request->get_param( 'since' ); |
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$channel = $request->get_param( 'channel' ); |
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$channels = $request->get_param( 'channels' ); |
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|
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if ( is_array( $channels ) && count( $channels ) > 0 ) { |
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// Multi-channel drain — concatenate the per-channel results. |
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$cursor = $since; |
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$all_events = array(); |
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foreach ( $channels as $ch ) { |
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$result = desktop_mode_debug_drain( $session_id, $since, (string) $ch ); |
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foreach ( $result['events'] as $ev ) { |
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$all_events[] = $ev; |
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} |
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if ( $result['cursor'] > $cursor ) { |
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$cursor = $result['cursor']; |
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} |
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} |
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usort( |
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$all_events, |
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static function ( $a, $b ) { |
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return ( (int) $a['id'] ) - ( (int) $b['id'] ); |
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} |
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); |
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return rest_ensure_response( |
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array( |
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'events' => $all_events, |
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'cursor' => $cursor, |
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) |
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); |
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} |
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|
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$result = desktop_mode_debug_drain( |
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$session_id, |
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$since, |
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is_string( $channel ) ? $channel : null |
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); |
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return rest_ensure_response( $result ); |
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} |
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|
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/** |
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* Permission gate for the debug REST endpoint. |
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* |
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* Logged-in admins only — debug data exposes internal request shapes |
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* that should never leak to lower-privileged users. Plugins that need |
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* to relax this for a specific session can hook the |
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* `desktop_mode_debug_rest_permission` filter (filters TRUE/FALSE). |
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* |
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* @since 0.6.0 |
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* |
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* @return bool |
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*/ |
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function desktop_mode_rest_debug_permission() { |
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$allowed = is_user_logged_in() && current_user_can( 'manage_options' ); |
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/** |
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* Filter the permission decision for the debug REST endpoint. |
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* |
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* @since 0.6.0 |
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* |
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* @param bool $allowed Default: caller is a logged-in admin. |
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*/ |
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return (bool) apply_filters( 'desktop_mode_debug_rest_permission', $allowed ); |
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} |
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|
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/** |
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* Register the debug REST routes. |
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* |
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* @since 0.6.0 |
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*/ |
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function desktop_mode_register_debug_rest_routes() { |
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register_rest_route( |
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'desktop-mode/v1', |
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'/debug', |
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array( |
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array( |
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'methods' => WP_REST_Server::READABLE, |
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'callback' => 'desktop_mode_rest_debug_drain', |
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'permission_callback' => 'desktop_mode_rest_debug_permission', |
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'args' => array( |
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'sessionId' => array( |
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'required' => true, |
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'type' => 'string', |
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), |
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'since' => array( |
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'type' => 'integer', |
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'default' => 0, |
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), |
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'channel' => array( |
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'type' => 'string', |
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), |
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'channels' => array( |
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'type' => 'array', |
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'items' => array( 'type' => 'string' ), |
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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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add_action( 'rest_api_init', 'desktop_mode_register_debug_rest_routes' ); |
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|
