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<?php |
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/** |
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* XSPEED_DROPIN |
| 4 |
* XSPEED_DROPIN_VERSION: 8 |
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* Drop-in cache loader. Serves cached HTML before WordPress fully boots. |
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* |
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* Bump XSPEED_DROPIN_VERSION whenever this file's serve logic changes so |
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* Cache::ensure_dropin_current() reinstalls it on existing sites (the |
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* "is it ours?" marker alone can't tell an old copy from a new one). |
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* v2: read .meta on the fast path — replay 404 status + feed Content-Type |
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* and honor per-content TTL (FBS-82406, FBS-82407). |
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* v3: conditional GET — emit Last-Modified + ETag, answer matching |
| 13 |
* If-Modified-Since / If-None-Match with 304 (FBS-82407 #5). |
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* v4: bail when the `.maintenance-active` sentinel is present so a page |
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* cached while live isn't served during maintenance (FBS-82409 B1). |
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* v5: per-site cache buckets — entries moved from `cache/xspeed/<md5>.html` |
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* to `cache/xspeed/<host>[/<blog-path>]/<md5>.html` so a multisite |
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* purge can be scoped to one blog. An un-bumped drop-in would keep |
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* reading the old flat path, miss every entry and boot WordPress on |
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* every request (#6). |
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* v6: serve tracking-param requests from the fast path — read the |
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* precompiled `ignored_query_params` allow-list instead of bailing on |
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* any query string (#13). An un-bumped drop-in keeps the old bail and |
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* campaign traffic keeps paying a full WordPress boot. |
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* v7: the page TTL is baked in at install time from the `cache_expiry` |
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* setting instead of a hardcoded 86400, so the drop-in enforces the |
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* configured lifetime rather than a fixed 24h (#240). |
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* v8: never serve an empty, stale, or short `.br` sibling — an uninflatable |
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* brotli stream renders as a blank page. THIS FILE IS A COPY made when |
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* caching was enabled, so without the bump an updated site keeps the old |
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* serve logic and never receives the fix (#286). |
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* |
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* IMPORTANT: This file is included by wp-settings.php BEFORE |
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* wp-includes/formatting.php and wp-includes/load.php are loaded, so NO |
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* WordPress functions (sanitize_text_field, wp_unslash, is_admin, |
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* HOUR_IN_SECONDS, etc.) are available here. Use raw PHP only. |
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* |
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* @package XSpeed |
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*/ |
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|
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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// Only handle plain GET requests. |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs before wp-includes/formatting.php loads, so wp_unslash() and sanitize_text_field() are unavailable. Value is upper-cased and matched against the literal string 'GET'; never echoed, never executed. |
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$xspeed_method = isset( $_SERVER['REQUEST_METHOD'] ) ? strtoupper( (string) $_SERVER['REQUEST_METHOD'] ) : ''; |
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if ( 'GET' !== $xspeed_method ) { |
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return; |
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} |
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|
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// Query-string requests. A tracking param contributes nothing to the |
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// response, and PHP already caches `/post?utm_source=x` under the same key |
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// as `/post` — but this file used to bail on ANY query string, so every |
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// visitor arriving from an email or ad campaign paid a full WordPress boot |
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// to be handed a file that was already on disk. On a marketing site that is |
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// most of the paid traffic taking the slowest path. (#13) |
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// |
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// We cannot read the option or call Glob_Matcher here (WordPress is not |
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// loaded), so Cache::sync_query_allowlist() precompiles the user's |
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// `ignored_query_params` into a regex next to the cache files. Every key |
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// must match it; one that doesn't means the response could genuinely vary, |
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// so we stand down and let PHP decide. A missing sidecar means the same — |
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// fail safe, never guess. |
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if ( ! empty( $_SERVER['QUERY_STRING'] ) ) { |
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$xspeed_allow_file = WP_CONTENT_DIR . '/cache/xspeed/.ignored-query-params'; |
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if ( ! is_readable( $xspeed_allow_file ) ) { |
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return; |
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} |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents, WordPress.PHP.NoSilencedErrors.Discouraged -- pre-WP drop-in; an unreadable sidecar degrades to "let PHP handle it". |
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$xspeed_allow_re = trim( (string) @file_get_contents( $xspeed_allow_file ) ); |
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if ( '' === $xspeed_allow_re ) { |
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return; |
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} |
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|
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs pre-WP. parse_str() urldecodes exactly as WordPress does; only KEYS are consumed, and only as preg_match() input — never echoed, never executed. |
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parse_str( str_replace( "\0", '', (string) $_SERVER['QUERY_STRING'] ), $xspeed_qs_params ); |
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if ( empty( $xspeed_qs_params ) ) { |
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return; |
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} |
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foreach ( array_keys( $xspeed_qs_params ) as $xspeed_qs_key ) { |
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// Anchored: a param named `referrer` must not be waved through by |
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// a `ref` entry. Mirrors Glob_Matcher's full-string semantics. |
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// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- a malformed baked pattern degrades to "let PHP handle it", never a warning per request. |
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if ( 1 !== @preg_match( '#^' . $xspeed_allow_re . '$#', (string) $xspeed_qs_key ) ) { |
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return; |
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} |
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} |
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} |
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|
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// Honor explicit bypass header. xSpeed's own benchmark REST endpoint |
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// sends `X-XSpeed-Bypass: 1` so we can measure uncached TTFB for the |
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// before/after comparison on the dashboard. Harmless if a third party |
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// sends it — they just get an uncached response. |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs before WP loads. Value is only used as an isset() check + literal string comparison, never echoed. |
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if ( ! empty( $_SERVER['HTTP_X_XSPEED_BYPASS'] ) ) { |
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return; |
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} |
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|
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// Maintenance / coming-soon sentinel. The Pro Maintenance-Cache module writes |
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// `.maintenance-active` next to the cache files whenever the site enters |
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// maintenance / coming-soon mode, and removes it on recovery. The write-side |
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// veto alone can't stop a page cached while the site was live from being |
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// served here (this drop-in runs before WordPress loads), so we bail out and |
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// let WordPress render the maintenance / coming-soon screen instead of serving |
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// a stale real-site page. (FBS-82409 B1) |
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if ( file_exists( WP_CONTENT_DIR . '/cache/xspeed/.maintenance-active' ) ) { |
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return; |
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} |
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|
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if ( ! isset( $_SERVER['REQUEST_URI'] ) ) { |
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return; |
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} |
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|
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// Raw-PHP sanitization: strip null bytes only. This value is used for |
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// substring comparisons and as input to md5() — never echoed, never |
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// executed, never written to disk as data. Magic quotes was removed in |
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// PHP 5.4 and the plugin requires PHP 7.4+, so no unslashing is needed. |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs before wp_unslash()/sanitize_text_field() are loaded; null-byte strip is the strongest sanitizer available pre-WP-bootstrap. Value is only used for substring comparison and as md5() input. |
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$xspeed_request_uri = str_replace( "\0", '', (string) $_SERVER['REQUEST_URI'] ); |
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|
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// Skip admin / login requests. |
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if ( false !== strpos( $xspeed_request_uri, '/wp-admin' ) || false !== strpos( $xspeed_request_uri, '/wp-login' ) ) { |
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return; |
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} |
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|
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// Skip logged-in users and comment authors — never serve a cached page to |
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// someone who has a session cookie. Reading raw cookies; we only inspect |
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// names, not values. |
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if ( ! empty( $_COOKIE ) ) { |
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foreach ( $_COOKIE as $xspeed_cookie_name => $xspeed_cookie_value ) { |
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unset( $xspeed_cookie_value ); |
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$xspeed_cookie_name = (string) $xspeed_cookie_name; |
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if ( 0 === strpos( $xspeed_cookie_name, 'wordpress_logged_in' ) |
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|| 0 === strpos( $xspeed_cookie_name, 'comment_author_' ) |
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|| 0 === strpos( $xspeed_cookie_name, 'wp-postpass_' ) |
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// The generic bypass cookie PHP sets whenever it decides a |
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// visitor must not be served from cache (Server_Rules:: |
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// BYPASS_COOKIE). Covers repeat visitors even when the baked |
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// rules below are stale. |
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|| 'wordpress_no_cache' === $xspeed_cookie_name ) { |
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return; |
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} |
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} |
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} |
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|
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// The user's own excluded-cookie list, baked in at install time by |
| 148 |
// Cache::install_dropin() (the token is replaced with an escaped regex |
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// built by Server_Rules). The drop-in runs before WordPress loads and so |
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// cannot read the settings itself; without this, every cart / membership |
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// / custom cookie rule applied only while a page was cold, and a warm |
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// page was served to exactly the visitors the settings excluded. |
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// |
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// An un-substituted token means the drop-in was copied straight from a |
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// source checkout — fall back to serving nothing from the fast path |
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// rather than treating the literal token as a pattern. |
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$xspeed_cookie_re = '@@XSPEED_COOKIE_RE@@'; |
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if ( '@@' !== substr( $xspeed_cookie_re, 0, 2 ) && '' !== $xspeed_cookie_re && ! empty( $_COOKIE ) ) { |
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foreach ( array_keys( $_COOKIE ) as $xspeed_cookie_name ) { |
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// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- a malformed baked pattern must degrade to "don't serve from cache", never warn on every request. |
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if ( 1 === @preg_match( '#(' . $xspeed_cookie_re . ')#i', (string) $xspeed_cookie_name ) ) { |
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return; |
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} |
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} |
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} |
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|
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// Same for the user-agent bypass list. This is the rule the bypass cookie |
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// can never cover: a bot's very first request to a warm page never |
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// reaches PHP, so there is no earlier request in which to set a cookie. |
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$xspeed_ua_re = '@@XSPEED_UA_RE@@'; |
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if ( '@@' !== substr( $xspeed_ua_re, 0, 2 ) && '' !== $xspeed_ua_re ) { |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs pre-WP. Value is only matched against a baked, pre-escaped regex; never echoed or executed. |
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$xspeed_ua_raw = isset( $_SERVER['HTTP_USER_AGENT'] ) ? (string) $_SERVER['HTTP_USER_AGENT'] : ''; |
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// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- see above; degrade to bypass rather than warn. |
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if ( '' !== $xspeed_ua_raw && 1 === @preg_match( '#(' . $xspeed_ua_re . ')#i', $xspeed_ua_raw ) ) { |
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return; |
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} |
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} |
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|
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs before wp_unslash()/sanitize_text_field() are loaded. Value is filtered through a strict allowlist regex below (letters, digits, dot, hyphen, colon) and only used as md5() input for the cache key. |
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$xspeed_host = isset( $_SERVER['HTTP_HOST'] ) ? (string) $_SERVER['HTTP_HOST'] : 'default'; |
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$xspeed_host = str_replace( "\0", '', $xspeed_host ); |
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// Restrict host to a safe charset (letters, digits, dot, hyphen, colon for port). |
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$xspeed_host = preg_replace( '/[^a-zA-Z0-9.\-:]/', '', $xspeed_host ); |
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|
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$xspeed_path_only = strtok( $xspeed_request_uri, '?' ); |
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|
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// Device bucket — MUST mirror XSpeed\Cache::cache_key() exactly, or the key |
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// the drop-in computes won't match the file Cache::store() wrote, the HIT |
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// branch below never fires, and every request falls through to a full |
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// WordPress boot (defeating the whole point of the pre-WP drop-in). |
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// |
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// Cache::cache_key() appends '|m' / '|d' when the cache module's |
| 194 |
// `mobile_separate` setting is on. The drop-in can't read WP options |
| 195 |
// (it runs before WordPress loads), so Cache writes a zero-byte sidecar |
| 196 |
// flag — `.mobile-separate` next to the cache files — whenever that setting |
| 197 |
// is on, and removes it when off (see Cache::sync_mobile_flag()). We mirror |
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// the same UA token list wp_is_mobile() uses, the same one Cache's inline |
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// fallback detector uses. |
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$xspeed_device = ''; |
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if ( file_exists( WP_CONTENT_DIR . '/cache/xspeed/.mobile-separate' ) ) { |
| 202 |
// Mirror core's wp_is_mobile() EXACTLY (which Cache::is_mobile_request() |
| 203 |
// defers to): check the Sec-CH-UA-Mobile client hint first, then fall |
| 204 |
// back to the same UA token list. Any divergence from the engine's |
| 205 |
// detection re-introduces the key mismatch this whole flag exists to |
| 206 |
// prevent. |
| 207 |
$xspeed_is_mobile = false; |
| 208 |
if ( isset( $_SERVER['HTTP_SEC_CH_UA_MOBILE'] ) ) { |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs pre-WP. Value is compared against the literal '?1', never echoed or executed. |
| 210 |
$xspeed_is_mobile = ( '?1' === $_SERVER['HTTP_SEC_CH_UA_MOBILE'] ); |
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} else { |
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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Drop-in runs before wp_unslash()/sanitize_text_field() load. Value is only matched against a literal token regex, never echoed or executed. |
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$xspeed_ua = isset( $_SERVER['HTTP_USER_AGENT'] ) ? (string) $_SERVER['HTTP_USER_AGENT'] : ''; |
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$xspeed_is_mobile = (bool) preg_match( '/(Mobile|Android|Silk\/|Kindle|BlackBerry|Opera Mini|Opera Mobi)/i', $xspeed_ua ); |
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} |
| 216 |
$xspeed_device = $xspeed_is_mobile ? '|m' : '|d'; |
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} |
| 218 |
|
| 219 |
$xspeed_cache_key = md5( $xspeed_host . $xspeed_path_only . $xspeed_device ); |
| 220 |
|
| 221 |
// Per-site bucket. MUST mirror XSpeed\Cache::current_host_dir() exactly — |
| 222 |
// same charset, same trimmed dots, same 'default' fallback, same multisite |
| 223 |
// path prefix — or the drop-in looks in a directory Cache::store() never |
| 224 |
// wrote to, every HIT misses, and every request falls through to a full |
| 225 |
// WordPress boot. |
| 226 |
// |
| 227 |
// Note this is NOT $xspeed_host: the cache KEY keeps the colon of |
| 228 |
// `host:port` (it only ever feeds md5()), while the DIRECTORY cannot — |
| 229 |
// a colon is not portable in a path. (#6) |
| 230 |
$xspeed_host_dir = $xspeed_host; |
| 231 |
$xspeed_host_colon = strpos( $xspeed_host_dir, ':' ); |
| 232 |
if ( false !== $xspeed_host_colon ) { |
| 233 |
$xspeed_host_dir = substr( $xspeed_host_dir, 0, $xspeed_host_colon ); |
| 234 |
} |
| 235 |
$xspeed_host_dir = preg_replace( '/[^a-zA-Z0-9.\-]/', '', $xspeed_host_dir ); |
| 236 |
$xspeed_host_dir = preg_replace( '/\.{2,}/', '.', (string) $xspeed_host_dir ); |
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$xspeed_host_dir = trim( (string) $xspeed_host_dir, '.-' ); |
| 238 |
if ( '' === $xspeed_host_dir ) { |
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$xspeed_host_dir = 'default'; |
| 240 |
} |
| 241 |
|
| 242 |
// Subdirectory multisite: every blog shares one host, so the host alone |
| 243 |
// would put them all in one bucket and they would keep purging each other. |
| 244 |
// We cannot call is_multisite()/get_blog_details() here (WordPress is not |
| 245 |
// loaded), so Cache::sync_site_paths() persists the network's blog paths |
| 246 |
// as `<raw-path>|<segment>` lines, longest first. Prefix-match the URI. |
| 247 |
$xspeed_paths_file = WP_CONTENT_DIR . '/cache/xspeed/.site-paths'; |
| 248 |
if ( file_exists( $xspeed_paths_file ) ) { |
| 249 |
$xspeed_uri_trimmed = ltrim( (string) $xspeed_path_only, '/' ); |
| 250 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- our own sidecar; WP_Filesystem is not loaded pre-WP. |
| 251 |
$xspeed_paths_raw = (string) @file_get_contents( $xspeed_paths_file ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- unreadable sidecar just means "no prefix". |
| 252 |
foreach ( explode( "\n", $xspeed_paths_raw ) as $xspeed_path_line ) { |
| 253 |
$xspeed_sep = strpos( $xspeed_path_line, '|' ); |
| 254 |
if ( false === $xspeed_sep ) { |
| 255 |
continue; |
| 256 |
} |
| 257 |
$xspeed_raw_path = substr( $xspeed_path_line, 0, $xspeed_sep ); |
| 258 |
$xspeed_segment = substr( $xspeed_path_line, $xspeed_sep + 1 ); |
| 259 |
if ( '' === $xspeed_raw_path || '' === $xspeed_segment ) { |
| 260 |
continue; |
| 261 |
} |
| 262 |
if ( $xspeed_uri_trimmed === $xspeed_raw_path |
| 263 |
|| 0 === strpos( $xspeed_uri_trimmed, $xspeed_raw_path . '/' ) ) { |
| 264 |
$xspeed_host_dir .= '/' . $xspeed_segment; |
| 265 |
break; |
| 266 |
} |
| 267 |
} |
| 268 |
} |
| 269 |
|
| 270 |
$xspeed_cache_dir = WP_CONTENT_DIR . '/cache/xspeed/' . $xspeed_host_dir . '/'; |
| 271 |
$xspeed_cache_file = $xspeed_cache_dir . $xspeed_cache_key . '.html'; |
| 272 |
$xspeed_meta_file = $xspeed_cache_dir . $xspeed_cache_key . '.meta'; |
| 273 |
|
| 274 |
if ( file_exists( $xspeed_cache_file ) ) { |
| 275 |
// Read the .meta sidecar (status / content_type / ttl) the same way the |
| 276 |
// PHP HIT path does — the drop-in serves cached feeds and 404s too, so it |
| 277 |
// must replay their Content-Type / status and honor their per-content TTL. |
| 278 |
// Ordinary 200 text/html pages have no .meta (the common path stays fast). |
| 279 |
// (FBS-82406 soft-404, FBS-82407 feed content-type + TTL) |
| 280 |
$xspeed_meta = array(); |
| 281 |
if ( file_exists( $xspeed_meta_file ) ) { |
| 282 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- pre-WP drop-in; one tiny JSON sidecar. |
| 283 |
$xspeed_meta_raw = file_get_contents( $xspeed_meta_file ); |
| 284 |
if ( false !== $xspeed_meta_raw ) { |
| 285 |
$xspeed_decoded = json_decode( $xspeed_meta_raw, true ); |
| 286 |
if ( is_array( $xspeed_decoded ) ) { |
| 287 |
$xspeed_meta = $xspeed_decoded; |
| 288 |
} |
| 289 |
} |
| 290 |
} |
| 291 |
|
| 292 |
// Per-content TTL from meta (e.g. feeds) falls back to the site's |
| 293 |
// configured cache_expiry, baked in at install time by |
| 294 |
// Cache::install_dropin() and re-baked on every settings save. The |
| 295 |
// drop-in runs before WordPress loads and so cannot read the option |
| 296 |
// itself; without this it applied a hardcoded 24h to every ordinary |
| 297 |
// page — write_meta() only writes a `ttl` sidecar when the value differs |
| 298 |
// from the page default, so ordinary pages carry no sidecar at all. |
| 299 |
// That served stale content under Conservative (12h) and refused the |
| 300 |
// fast path for 6 of 7 days under Aggressive (168h). (#240) |
| 301 |
// |
| 302 |
// An un-substituted token means the drop-in was copied straight from a |
| 303 |
// source checkout — fall back to the historical 24h literal rather than |
| 304 |
// treating the token as a number. HOUR_IN_SECONDS isn't defined yet. |
| 305 |
$xspeed_default_ttl = '@@XSPEED_DEFAULT_TTL@@'; |
| 306 |
$xspeed_unbaked = ( '@@' === substr( $xspeed_default_ttl, 0, 2 ) || (int) $xspeed_default_ttl < 1 ); |
| 307 |
$xspeed_default_ttl = $xspeed_unbaked ? 86400 : (int) $xspeed_default_ttl; |
| 308 |
if ( $xspeed_unbaked ) { |
| 309 |
// Make the un-substituted state observable. Serving the 24h literal |
| 310 |
// silently is exactly how the original bug stayed invisible; a site |
| 311 |
// on this path is enforcing a lifetime nobody configured. |
| 312 |
header( 'X-XSpeed-Cache-TTL: default (unbaked)' ); |
| 313 |
} |
| 314 |
|
| 315 |
$xspeed_ttl = ( isset( $xspeed_meta['ttl'] ) && (int) $xspeed_meta['ttl'] > 0 ) ? (int) $xspeed_meta['ttl'] : $xspeed_default_ttl; |
| 316 |
$xspeed_age = time() - filemtime( $xspeed_cache_file ); |
| 317 |
if ( $xspeed_age < $xspeed_ttl ) { |
| 318 |
// PHP-served cache hit (the ~85ms fallback path). The nginx static |
| 319 |
// rewrite sends "HIT (nginx)" for the fast 5-15ms path; same header, |
| 320 |
// distinct value so you can tell which layer served the page. |
| 321 |
header( 'X-XSpeed-Cache: HIT (php)' ); |
| 322 |
|
| 323 |
// Record the HIT for the dashboard hit-ratio. The drop-in runs |
| 324 |
// BEFORE WordPress loads, so it can't call Hit_Counter — instead |
| 325 |
// it appends one line to the same hits.log the nginx static path |
| 326 |
// uses, and Hit_Counter::collect_nginx_log_hits() drains + counts |
| 327 |
// both on the next dashboard load. Without this, every drop-in HIT |
| 328 |
// was served but never counted, so the hit ratio sat at 0. |
| 329 |
// Best-effort: a failed append must never break serving the page. |
| 330 |
// |
| 331 |
// Path is baked in at install time by Cache::install_dropin(), which |
| 332 |
// replaces the @@XSPEED_HITS_LOG@@ token on the next line with the |
| 333 |
// resolved absolute path (uploads/xspeed/hits.log — NOT the cache dir, |
| 334 |
// which gets deleted on purge/uninstall and would take nginx down, |
| 335 |
// FBS-82478). The default below is the fallback for an un-substituted |
| 336 |
// drop-in (e.g. run straight from a dev source checkout); the installed |
| 337 |
// copy always carries the absolute uploads path. |
| 338 |
$xspeed_hits_log = '@@XSPEED_HITS_LOG@@'; // replaced at install |
| 339 |
if ( '@@' === substr( $xspeed_hits_log, 0, 2 ) ) { |
| 340 |
$xspeed_hits_log = WP_CONTENT_DIR . '/uploads/xspeed/hits.log'; |
| 341 |
} |
| 342 |
// 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). |
| 343 |
@file_put_contents( $xspeed_hits_log, "hit\n", FILE_APPEND | LOCK_EX ); |
| 344 |
|
| 345 |
// Replay the cached response's status + content-type from .meta, so a |
| 346 |
// cached 404 serves 404 (not a soft-404 200) and a cached feed serves |
| 347 |
// application/rss+xml (not text/html). (FBS-82406, FBS-82407) |
| 348 |
if ( ! empty( $xspeed_meta['status'] ) && function_exists( 'http_response_code' ) ) { |
| 349 |
http_response_code( (int) $xspeed_meta['status'] ); |
| 350 |
} |
| 351 |
if ( ! empty( $xspeed_meta['content_type'] ) && is_string( $xspeed_meta['content_type'] ) ) { |
| 352 |
header( 'Content-Type: ' . $xspeed_meta['content_type'] ); |
| 353 |
} |
| 354 |
|
| 355 |
// Conditional GET: Last-Modified + ETag from the cache file's mtime, |
| 356 |
// answer a matching If-Modified-Since / If-None-Match with 304 so |
| 357 |
// aggregators skip re-downloading an unchanged cached feed/page. |
| 358 |
// (FBS-82407 #5) |
| 359 |
$xspeed_mtime = (int) filemtime( $xspeed_cache_file ); |
| 360 |
if ( $xspeed_mtime > 0 ) { |
| 361 |
$xspeed_lastmod = gmdate( 'D, d M Y H:i:s', $xspeed_mtime ) . ' GMT'; |
| 362 |
$xspeed_etag = '"' . md5( $xspeed_cache_file . '|' . $xspeed_mtime ) . '"'; |
| 363 |
header( 'Last-Modified: ' . $xspeed_lastmod ); |
| 364 |
header( 'ETag: ' . $xspeed_etag ); |
| 365 |
// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- pre-WP drop-in; values only compared to a server-generated etag / parsed as a date, never echoed or executed. |
| 366 |
$xspeed_inm = isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ? trim( (string) $_SERVER['HTTP_IF_NONE_MATCH'] ) : ''; |
| 367 |
// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- as above. |
| 368 |
$xspeed_ims = isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ? trim( (string) $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) : ''; |
| 369 |
if ( ( '' !== $xspeed_inm && false !== strpos( $xspeed_inm, $xspeed_etag ) ) |
| 370 |
|| ( '' !== $xspeed_ims && false !== ( $xspeed_ims_ts = strtotime( $xspeed_ims ) ) && $xspeed_ims_ts >= $xspeed_mtime ) ) { |
| 371 |
if ( function_exists( 'http_response_code' ) ) { |
| 372 |
http_response_code( 304 ); |
| 373 |
} |
| 374 |
exit; |
| 375 |
} |
| 376 |
} |
| 377 |
|
| 378 |
// Serve the precompressed Brotli sibling when the client accepts it |
| 379 |
// and the Pro Brotli module wrote <file>.br. MUST mirror |
| 380 |
// XSpeed\Cache::maybe_serve_brotli() on the non-drop-in serve path — |
| 381 |
// both decide on the same Accept-Encoding token match + sibling |
| 382 |
// existence, so the response is identical whichever path serves. |
| 383 |
// pre-WP: no sanitize_text_field()/wp_unslash(); the value is only |
| 384 |
// lowercased + regex-matched, never echoed. |
| 385 |
// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash,WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- pre-WP drop-in; value is only lowercased + token-matched, never echoed or executed. |
| 386 |
$xspeed_accept_enc = isset( $_SERVER['HTTP_ACCEPT_ENCODING'] ) ? strtolower( str_replace( "\0", '', (string) $_SERVER['HTTP_ACCEPT_ENCODING'] ) ) : ''; |
| 387 |
$xspeed_br_file = $xspeed_cache_file . '.br'; |
| 388 |
|
| 389 |
// Existence is NOT enough: an empty or stale sibling is unservable. |
| 390 |
// Mirrors XSpeed\Cache::brotli_sibling_is_usable(); inlined because |
| 391 |
// this file runs before WordPress and cannot call it. |
| 392 |
// |
| 393 |
// Deliberately NO size-ratio floor. Brotli's ratio is unbounded on |
| 394 |
// repetitive input — a ~1 MB page of table rows compresses to about |
| 395 |
// 0.04% — so a floor rejects genuinely good siblings and silently |
| 396 |
// serves the uncompressed page. |
| 397 |
// |
| 398 |
// Truncation is instead caught exactly, from the byte count the |
| 399 |
// writer recorded in `<file>.br.size` when it published the sibling. |
| 400 |
// A stream shorter than its own declared length cannot inflate; one |
| 401 |
// that matches was published whole. Where no record exists — a |
| 402 |
// sibling written before this version, which is precisely the |
| 403 |
// already-broken file sitting on a live site right now — the checks |
| 404 |
// below still apply and the atomic writer stops new ones appearing. |
| 405 |
$xspeed_br_ok = false; |
| 406 |
if ( is_readable( $xspeed_br_file ) ) { |
| 407 |
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- pre-WP drop-in; a stat failure means "don't serve it", handled by the size checks. |
| 408 |
$xspeed_br_size = (int) @filesize( $xspeed_br_file ); |
| 409 |
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- as above. |
| 410 |
$xspeed_html_size = (int) @filesize( $xspeed_cache_file ); |
| 411 |
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- as above. |
| 412 |
$xspeed_br_mtime = (int) @filemtime( $xspeed_br_file ); |
| 413 |
|
| 414 |
// MUST mirror XSpeed\Cache::brotli_expected_size(); 0 means "no |
| 415 |
// record", never "zero bytes". |
| 416 |
$xspeed_br_expected = 0; |
| 417 |
$xspeed_br_sidecar = $xspeed_br_file . '.size'; |
| 418 |
if ( is_readable( $xspeed_br_sidecar ) ) { |
| 419 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,WordPress.PHP.NoSilencedErrors.Discouraged -- pre-WP drop-in; an unreadable sidecar means "unknown", handled by the cast. |
| 420 |
$xspeed_br_expected = (int) trim( (string) @file_get_contents( $xspeed_br_sidecar ) ); |
| 421 |
if ( $xspeed_br_expected < 0 ) { |
| 422 |
$xspeed_br_expected = 0; |
| 423 |
} |
| 424 |
} |
| 425 |
|
| 426 |
$xspeed_br_ok = $xspeed_br_size > 0 |
| 427 |
&& $xspeed_html_size > 0 |
| 428 |
// Not stale: a sibling older than the page would serve the |
| 429 |
// previous revision under the current entry's ETag. |
| 430 |
&& ( $xspeed_br_mtime <= 0 || $xspeed_mtime <= 0 || $xspeed_br_mtime >= $xspeed_mtime ) |
| 431 |
// Not truncated, where the writer left a length to check. |
| 432 |
&& ( $xspeed_br_expected <= 0 || $xspeed_br_size === $xspeed_br_expected ); |
| 433 |
} |
| 434 |
|
| 435 |
if ( preg_match( '/(^|[\s,])br([\s,;]|$)/', $xspeed_accept_enc ) |
| 436 |
&& $xspeed_br_ok ) { |
| 437 |
header( 'Content-Encoding: br' ); |
| 438 |
header( 'Vary: Accept-Encoding', false ); |
| 439 |
header_remove( 'Content-Length' ); |
| 440 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_readfile -- Drop-in runs before WP_Filesystem is available; readfile streams the precompressed sibling directly. |
| 441 |
readfile( $xspeed_br_file ); |
| 442 |
exit; |
| 443 |
} |
| 444 |
|
| 445 |
// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_readfile -- Drop-in runs before WP_Filesystem is available; readfile is optimal for streaming a static cache file to the visitor. |
| 446 |
readfile( $xspeed_cache_file ); |
| 447 |
exit; |
| 448 |
} |
| 449 |
} |
| 450 |
|
