| @@ -1,8 +1,8 @@ | ||
| 1 | 1 | <?php |
| 2 | 2 | /** |
| 3 | 3 | * XSPEED_DROPIN |
| 4 | - * XSPEED_DROPIN_VERSION: 9 | |
| 4 | + * XSPEED_DROPIN_VERSION: 15 | |
| 5 | 5 | * Drop-in cache loader. Serves cached HTML before WordPress fully boots. |
| 6 | 6 | * |
| 7 | 7 | * Bump XSPEED_DROPIN_VERSION whenever this file's serve logic changes so |
| 8 | 8 | * Cache::ensure_dropin_current() reinstalls it on existing sites (the |
| @@ -28,8 +28,47 @@ | ||
| 28 | 28 | * v8: never serve an empty, stale, or short `.br` sibling — an uninflatable |
| 29 | 29 | * brotli stream renders as a blank page. THIS FILE IS A COPY made when |
| 30 | 30 | * caching was enabled, so without the bump an updated site keeps the old |
| 31 | 31 | * serve logic and never receives the fix (#286). |
| 32 | + * v9: emit the edge/CDN headers baked in from `xspeed_edge_cache_headers` | |
| 33 | + * on a HIT. Without the bump an existing site keeps a drop-in with no | |
| 34 | + * placeholder to bake into, so an add-on's CDN headers appear on every | |
| 35 | + * serve path except this one. | |
| 36 | + * v10: emit `X-XSpeed-Built` — the served file's mtime — so a CDN that has | |
| 37 | + * just purged can tell whether the origin answered with newer HTML or | |
| 38 | + * with the same page again. Without the bump an existing site's drop-in | |
| 39 | + * stays silent and every purge through it reads as unverifiable. | |
| 40 | + * v11: a page whose edge answer differs from the site-wide one carries its | |
| 41 | + * own pairs in the `.meta` sidecar, and they REPLACE the baked set. | |
| 42 | + * Without the bump an existing drop-in keeps sending the baked pairs | |
| 43 | + * for that page, lifetime and all. | |
| 44 | + * v12: `XSPEED_EDGE_PROVIDER=off` empties the edge pairs here too, before | |
| 45 | + * they are sent, so the emergency switch does not wait for a re-bake. | |
| 46 | + * `X-XSpeed-Built` still goes out: it is a diagnostic, not an | |
| 47 | + * instruction to the edge. | |
| 48 | + * v13: a merge of two lines of history that had both used 9 and 10. On `dev` | |
| 49 | + * they were: v9 carries the baked edge-header answer so a hold set for a | |
| 50 | + * page reaches the paths that run without PHP, and v10 keeps bots, | |
| 51 | + * scanners, cached 404s and xSpeed's own requests (by UA or the | |
| 52 | + * X-XSpeed-Self header) out of hits.log. Everything in v9 to v12 above | |
| 53 | + * and both of those are in this file. The bump is what makes a site on | |
| 54 | + * either line rewrite its drop-in. | |
| 55 | + * v14: the key path lowercases percent-escapes and escapes non-ASCII bytes, | |
| 56 | + * the spelling Cache::normalize_path() now hashes, so `%E7`, `%e7` and | |
| 57 | + * raw UTF-8 spellings of a non-ASCII slug share one key with the entry | |
| 58 | + * PHP wrote. Before, PHP keyed a sanitize_text_field() copy that had | |
| 59 | + * lost every escape, so these pages were never a HIT here. Without the | |
| 60 | + * bump an existing site keeps computing the old key for them. | |
| 61 | + * v15: two changes, one bump. | |
| 62 | + * - A page with a lifetime of its own (the sidecar `ttl`: a nonce cap, | |
| 63 | + * a per-post expiry) has every edge lifetime in its pairs cut to what | |
| 64 | + * the copy has left. Without the bump an existing drop-in keeps | |
| 65 | + * telling the edge to hold a nonce page for the site's whole lifetime. | |
| 66 | + * - A HIT served for a URL carrying an ignored param (`?utm_source=…`) | |
| 67 | + * sends the baked `query-variant` hold instead of the edge lifetime, | |
| 68 | + * so an edge keeps only URLs a purge can name. A query string of `0` | |
| 69 | + * is no longer read as no query string. Without the bump an existing | |
| 70 | + * drop-in keeps telling the edge to store every variant. | |
| 32 | 71 | * |
| 33 | 72 | * IMPORTANT: This file is included by wp-settings.php BEFORE |
| 34 | 73 | * wp-includes/formatting.php and wp-includes/load.php are loaded, so NO |
| 35 | 74 | * WordPress functions (sanitize_text_field, wp_unslash, is_admin, |
| @@ -61,9 +100,18 @@ | ||
| 61 | 100 | // `ignored_query_params` into a regex next to the cache files. Every key |
| 62 | 101 | // must match it; one that doesn't means the response could genuinely vary, |
| 63 | 102 | // so we stand down and let PHP decide. A missing sidecar means the same — |
| 64 | 103 | // fail safe, never guess. |
| 65 | -if ( ! empty( $_SERVER['QUERY_STRING'] ) ) { | |
| 104 | +// | |
| 105 | +// A key that matches is one the cache key leaves out, so the URL it makes is | |
| 106 | +// one no purge names. `$xspeed_qs_unpurged` records that for the edge hold | |
| 107 | +// further down, the same test Cache::query_carries_unpurged_param() makes. | |
| 108 | +// | |
| 109 | +// An empty string test rather than empty(): a query string of `0` is still a | |
| 110 | +// query string, and empty() let `/post?0` through as if it were `/post`. | |
| 111 | +$xspeed_qs_unpurged = false; | |
| 112 | +// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs pre-WP. Only tested for emptiness here; parsed for its keys below. | |
| 113 | +if ( isset( $_SERVER['QUERY_STRING'] ) && '' !== (string) $_SERVER['QUERY_STRING'] ) { | |
| 66 | 114 | $xspeed_allow_file = WP_CONTENT_DIR . '/cache/xspeed/.ignored-query-params'; |
| 67 | 115 | if ( ! is_readable( $xspeed_allow_file ) ) { |
| 68 | 116 | return; |
| 69 | 117 | } |
| @@ -84,8 +132,9 @@ | ||
| 84 | 132 | // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- a malformed baked pattern degrades to "let PHP handle it", never a warning per request. |
| 85 | 133 | if ( 1 !== @preg_match( '#^' . $xspeed_allow_re . '$#', (string) $xspeed_qs_key ) ) { |
| 86 | 134 | return; |
| 87 | 135 | } |
| 136 | + $xspeed_qs_unpurged = true; | |
| 88 | 137 | } |
| 89 | 138 | } |
| 90 | 139 | |
| 91 | 140 | // Honor explicit bypass header. xSpeed's own benchmark REST endpoint |
| @@ -182,10 +231,25 @@ | ||
| 182 | 231 | $xspeed_host = str_replace( "\0", '', $xspeed_host ); |
| 183 | 232 | // Restrict host to a safe charset (letters, digits, dot, hyphen, colon for port). |
| 184 | 233 | $xspeed_host = preg_replace( '/[^a-zA-Z0-9.\-:]/', '', $xspeed_host ); |
| 185 | 234 | |
| 186 | -$xspeed_path_only = strtok( $xspeed_request_uri, '?' ); | |
| 235 | +$xspeed_path_only = (string) strtok( $xspeed_request_uri, '?' ); | |
| 187 | 236 | |
| 237 | +// Path spelling. MUST mirror XSpeed\Cache::normalize_path() exactly. | |
| 238 | +// WordPress links carry lower-case escapes and browsers send upper-case ones, | |
| 239 | +// so escapes are lowercased, and a byte outside printable ASCII is escaped the | |
| 240 | +// same way. Nothing is decoded. Without this a non-ASCII slug requested as | |
| 241 | +// `%E7…` or as raw UTF-8 hashes to a different key than the one | |
| 242 | +// Cache::store() wrote. A plain ASCII path passes through unchanged. The | |
| 243 | +// site-path match below sees this spelling too; blog paths are plain ASCII. | |
| 244 | +$xspeed_path_only = (string) preg_replace_callback( | |
| 245 | + '/%[0-9a-fA-F]{2}|[^\x21-\x7E]/', | |
| 246 | + static function ( $xspeed_m ) { | |
| 247 | + return '%' === $xspeed_m[0][0] ? strtolower( $xspeed_m[0] ) : sprintf( '%%%02x', ord( $xspeed_m[0] ) ); | |
| 248 | + }, | |
| 249 | + $xspeed_path_only | |
| 250 | +); | |
| 251 | + | |
| 188 | 252 | // Device bucket — MUST mirror XSpeed\Cache::cache_key() exactly, or the key |
| 189 | 253 | // the drop-in computes won't match the file Cache::store() wrote, the HIT |
| 190 | 254 | // branch below never fires, and every request falls through to a full |
| 191 | 255 | // WordPress boot (defeating the whole point of the pre-WP drop-in). |
| @@ -337,8 +401,31 @@ | ||
| 337 | 401 | if ( isset( $xspeed_meta['edge_headers'] ) && is_array( $xspeed_meta['edge_headers'] ) ) { |
| 338 | 402 | $xspeed_edge_headers = $xspeed_meta['edge_headers']; |
| 339 | 403 | } |
| 340 | 404 | |
| 405 | + // A URL carrying an ignored param gets the hold baked for it instead. | |
| 406 | + // This file serves `/post?utm_source=x` from the entry stored for | |
| 407 | + // `/post`, but an edge keys on the full URL, so it would store each | |
| 408 | + // variant as its own copy, and a purge of `/post` never reaches them. | |
| 409 | + // Holding the variants keeps the edge to URLs a purge can name. This | |
| 410 | + // file keeps serving them; only the edge copy is refused. | |
| 411 | + // | |
| 412 | + // It replaces the sidecar too, since that carries a lifetime. The | |
| 413 | + // page's `Cache-Tag` is kept, as Cache::edge_headers_for() keeps it on | |
| 414 | + // every hold. An empty literal means the hold would say the same as | |
| 415 | + // the plain answer, and nothing changes. An un-substituted token | |
| 416 | + // stays a string and is ignored. | |
| 417 | + $xspeed_query_hold = '@@XSPEED_EDGE_QUERY_HOLD@@'; | |
| 418 | + if ( $xspeed_qs_unpurged && is_array( $xspeed_query_hold ) && array() !== $xspeed_query_hold ) { | |
| 419 | + $xspeed_query_tag = ( is_array( $xspeed_edge_headers ) && isset( $xspeed_edge_headers['Cache-Tag'] ) ) | |
| 420 | + ? $xspeed_edge_headers['Cache-Tag'] | |
| 421 | + : null; | |
| 422 | + $xspeed_edge_headers = $xspeed_query_hold; | |
| 423 | + if ( null !== $xspeed_query_tag ) { | |
| 424 | + $xspeed_edge_headers['Cache-Tag'] = $xspeed_query_tag; | |
| 425 | + } | |
| 426 | + } | |
| 427 | + | |
| 341 | 428 | // The one setting this file reads for itself. Everything else about |
| 342 | 429 | // the edge answer is baked, because re-deriving it here would mean |
| 343 | 430 | // loading options before WordPress exists. `off` is the exception |
| 344 | 431 | // because it is the emergency switch: when something is wrong in |
| @@ -347,8 +434,36 @@ | ||
| 347 | 434 | if ( defined( 'XSPEED_EDGE_PROVIDER' ) && 'off' === strtolower( (string) XSPEED_EDGE_PROVIDER ) ) { |
| 348 | 435 | $xspeed_edge_headers = array(); |
| 349 | 436 | } |
| 350 | 437 | |
| 438 | + // A page with a lifetime of its own (a nonce it carries, a per-post | |
| 439 | + // expiry: the sidecar `ttl`) may not be kept at the edge past it. A | |
| 440 | + // lifetime in the pairs is the site's, so it is cut to what this copy | |
| 441 | + // has left. Without the cut a page capped to its nonce went to the edge | |
| 442 | + // with the site's lifetime and served a dead nonce until the next purge. | |
| 443 | + // | |
| 444 | + // The two patterns copy Cache::EDGE_LIFETIME_HEADER and | |
| 445 | + // Cache::EDGE_LIFETIME_DIRECTIVE, and the cut copies | |
| 446 | + // Cache::cap_edge_lifetime(): the class is not loaded yet. | |
| 447 | + if ( is_array( $xspeed_edge_headers ) && isset( $xspeed_meta['ttl'] ) && (int) $xspeed_meta['ttl'] > 0 ) { | |
| 448 | + $xspeed_left = max( 0, $xspeed_ttl - $xspeed_age ); | |
| 449 | + foreach ( $xspeed_edge_headers as $xspeed_edge_name => $xspeed_edge_value ) { | |
| 450 | + if ( ! preg_match( '/(?:^|-)control$/i', (string) $xspeed_edge_name ) ) { | |
| 451 | + continue; | |
| 452 | + } | |
| 453 | + $xspeed_capped = preg_replace_callback( | |
| 454 | + '/(?<![\w-])(max-age|s-maxage)\s*=\s*"?(\d+)"?/i', | |
| 455 | + static function ( array $m ) use ( $xspeed_left ): string { | |
| 456 | + return $m[1] . '=' . min( (int) $m[2], $xspeed_left ); | |
| 457 | + }, | |
| 458 | + (string) $xspeed_edge_value | |
| 459 | + ); | |
| 460 | + if ( is_string( $xspeed_capped ) ) { | |
| 461 | + $xspeed_edge_headers[ $xspeed_edge_name ] = $xspeed_capped; | |
| 462 | + } | |
| 463 | + } | |
| 464 | + } | |
| 465 | + | |
| 351 | 466 | if ( is_array( $xspeed_edge_headers ) ) { |
| 352 | 467 | foreach ( $xspeed_edge_headers as $xspeed_edge_name => $xspeed_edge_value ) { |
| 353 | 468 | header( $xspeed_edge_name . ': ' . $xspeed_edge_value ); |
| 354 | 469 | } |
| @@ -353,8 +468,22 @@ | ||
| 353 | 468 | header( $xspeed_edge_name . ': ' . $xspeed_edge_value ); |
| 354 | 469 | } |
| 355 | 470 | } |
| 356 | 471 | |
| 472 | + // When this page's HTML was generated, so a CDN that just asked for a | |
| 473 | + // purge can check whether the origin actually served something newer. | |
| 474 | + // The cache file's mtime is that moment: store_static() writes the | |
| 475 | + // file at the end of the render it came from. | |
| 476 | + // | |
| 477 | + // Emitted AFTER the baked pairs above and therefore replacing any | |
| 478 | + // build stamp among them. A baked value is the time the DROP-IN was | |
| 479 | + // installed, identical on every page for as long as it stays | |
| 480 | + // installed, so it would answer "yes, freshly built" to every purge | |
| 481 | + // check forever. Cache::edge_headers_for() already drops it from the | |
| 482 | + // bake; this ordering means a drop-in installed by an older version | |
| 483 | + // cannot lie either. | |
| 484 | + header( 'X-XSpeed-Built: ' . (int) filemtime( $xspeed_cache_file ) ); | |
| 485 | + | |
| 357 | 486 | // Record the HIT for the dashboard hit-ratio. The drop-in runs |
| 358 | 487 | // BEFORE WordPress loads, so it can't call Hit_Counter — instead |
| 359 | 488 | // it appends one line to the same hits.log the nginx static path |
| 360 | 489 | // uses, and Hit_Counter::collect_nginx_log_hits() drains + counts |
| @@ -372,10 +501,33 @@ | ||
| 372 | 501 | $xspeed_hits_log = '@@XSPEED_HITS_LOG@@'; // replaced at install |
| 373 | 502 | if ( '@@' === substr( $xspeed_hits_log, 0, 2 ) ) { |
| 374 | 503 | $xspeed_hits_log = WP_CONTENT_DIR . '/uploads/xspeed/hits.log'; |
| 375 | 504 | } |
| 376 | - // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged, WordPress.WP.AlternativeFunctions.file_system_operations_file_put_contents -- pre-WP drop-in; WP_Filesystem isn't loaded. One short line, append + lock; failures are non-fatal (the ratio just under-counts). | |
| 377 | - @file_put_contents( $xspeed_hits_log, "hit\n", FILE_APPEND | LOCK_EX ); | |
| 505 | + // Don't count a bot, a scanner, a 404 or one of xSpeed's own | |
| 506 | + // requests as a visitor hit. It has to be decided HERE: the log line | |
| 507 | + // is just "hit" with no user agent, so Hit_Counter batch-counts these | |
| 508 | + // lines blind and nothing downstream can reclassify one. The UA | |
| 509 | + // pattern is baked in at install time from | |
| 510 | + // Hit_Counter::excluded_ua_regex() (the drop-in runs before | |
| 511 | + // WordPress, so it cannot ask). xSpeed's own requests also carry the | |
| 512 | + // X-XSpeed-Self header (Self_Traffic::HEADER), which is what catches | |
| 513 | + // a warmer renamed to a real browser's UA without dropping real | |
| 514 | + // visitors on that browser. An empty UA counts as automated, like | |
| 515 | + // is_bot_ua(''). A cached 404 is excluded on the PHP path too. | |
| 516 | + // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- pre-WP drop-in; only matched against a baked pattern, never echoed or stored. | |
| 517 | + $xspeed_hit_ua = isset( $_SERVER['HTTP_USER_AGENT'] ) ? (string) $_SERVER['HTTP_USER_AGENT'] : ''; | |
| 518 | + $xspeed_hit_ex = '@@XSPEED_HIT_EXCLUDE_RE@@'; | |
| 519 | + $xspeed_self = '' === $xspeed_hit_ua | |
| 520 | + || ! empty( $_SERVER['HTTP_X_XSPEED_SELF'] ) | |
| 521 | + || ( isset( $xspeed_meta['status'] ) && 404 === (int) $xspeed_meta['status'] ); | |
| 522 | + if ( ! $xspeed_self && '@@' !== substr( $xspeed_hit_ex, 0, 2 ) && '' !== $xspeed_hit_ex ) { | |
| 523 | + // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- a pattern this file did not compose is not worth a warning on every hit. | |
| 524 | + $xspeed_self = 1 === @preg_match( '#(' . $xspeed_hit_ex . ')#i', $xspeed_hit_ua ); | |
| 525 | + } | |
| 526 | + if ( ! $xspeed_self ) { | |
| 527 | + // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged, WordPress.WP.AlternativeFunctions.file_system_operations_file_put_contents -- pre-WP drop-in; WP_Filesystem isn't loaded. One short line, append + lock; failures are non-fatal (the ratio just under-counts). | |
| 528 | + @file_put_contents( $xspeed_hits_log, "hit\n", FILE_APPEND | LOCK_EX ); | |
| 529 | + } | |
| 378 | 530 | |
| 379 | 531 | // Replay the cached response's status + content-type from .meta, so a |
| 380 | 532 | // cached 404 serves 404 (not a soft-404 200) and a cached feed serves |
| 381 | 533 | // application/rss+xml (not text/html). (FBS-82406, FBS-82407) |
