| 1 |
<?php |
| 2 |
/** |
| 3 |
* XSPEED_DROPIN |
| 4 |
* Drop-in cache loader. Serves cached HTML before WordPress fully boots. |
| 5 |
* |
| 6 |
* IMPORTANT: This file is included by wp-settings.php BEFORE |
| 7 |
* wp-includes/formatting.php and wp-includes/load.php are loaded, so NO |
| 8 |
* WordPress functions (sanitize_text_field, wp_unslash, is_admin, |
| 9 |
* HOUR_IN_SECONDS, etc.) are available here. Use raw PHP only. |
| 10 |
* |
| 11 |
* @package XSpeed |
| 12 |
*/ |
| 13 |
|
| 14 |
if ( ! defined( 'ABSPATH' ) ) { |
| 15 |
exit; |
| 16 |
} |
| 17 |
|
| 18 |
// Only handle plain GET requests. |
| 19 |
// 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. |
| 20 |
$xspeed_method = isset( $_SERVER['REQUEST_METHOD'] ) ? strtoupper( (string) $_SERVER['REQUEST_METHOD'] ) : ''; |
| 21 |
if ( 'GET' !== $xspeed_method ) { |
| 22 |
return; |
| 23 |
} |
| 24 |
|
| 25 |
// Skip cached query-string requests (search, pagination via ?, etc.). |
| 26 |
if ( ! empty( $_SERVER['QUERY_STRING'] ) ) { |
| 27 |
return; |
| 28 |
} |
| 29 |
|
| 30 |
if ( ! isset( $_SERVER['REQUEST_URI'] ) ) { |
| 31 |
return; |
| 32 |
} |
| 33 |
|
| 34 |
// Raw-PHP sanitization: strip null bytes only. This value is used for |
| 35 |
// substring comparisons and as input to md5() — never echoed, never |
| 36 |
// executed, never written to disk as data. Magic quotes was removed in |
| 37 |
// PHP 5.4 and the plugin requires PHP 7.4+, so no unslashing is needed. |
| 38 |
// 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. |
| 39 |
$xspeed_request_uri = str_replace( "\0", '', (string) $_SERVER['REQUEST_URI'] ); |
| 40 |
|
| 41 |
// Skip admin / login requests. |
| 42 |
if ( false !== strpos( $xspeed_request_uri, '/wp-admin' ) || false !== strpos( $xspeed_request_uri, '/wp-login' ) ) { |
| 43 |
return; |
| 44 |
} |
| 45 |
|
| 46 |
// Skip logged-in users and comment authors — never serve a cached page to |
| 47 |
// someone who has a session cookie. Reading raw cookies; we only inspect |
| 48 |
// names, not values. |
| 49 |
if ( ! empty( $_COOKIE ) ) { |
| 50 |
foreach ( $_COOKIE as $xspeed_cookie_name => $xspeed_cookie_value ) { |
| 51 |
unset( $xspeed_cookie_value ); |
| 52 |
$xspeed_cookie_name = (string) $xspeed_cookie_name; |
| 53 |
if ( 0 === strpos( $xspeed_cookie_name, 'wordpress_logged_in' ) |
| 54 |
|| 0 === strpos( $xspeed_cookie_name, 'comment_author_' ) |
| 55 |
|| 0 === strpos( $xspeed_cookie_name, 'wp-postpass_' ) ) { |
| 56 |
return; |
| 57 |
} |
| 58 |
} |
| 59 |
} |
| 60 |
|
| 61 |
// 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. |
| 62 |
$xspeed_host = isset( $_SERVER['HTTP_HOST'] ) ? (string) $_SERVER['HTTP_HOST'] : 'default'; |
| 63 |
$xspeed_host = str_replace( "\0", '', $xspeed_host ); |
| 64 |
// Restrict host to a safe charset (letters, digits, dot, hyphen, colon for port). |
| 65 |
$xspeed_host = preg_replace( '/[^a-zA-Z0-9.\-:]/', '', $xspeed_host ); |
| 66 |
|
| 67 |
$xspeed_path_only = strtok( $xspeed_request_uri, '?' ); |
| 68 |
$xspeed_cache_key = md5( $xspeed_host . $xspeed_path_only ); |
| 69 |
$xspeed_cache_file = WP_CONTENT_DIR . '/cache/xspeed/' . $xspeed_cache_key . '.html'; |
| 70 |
|
| 71 |
if ( file_exists( $xspeed_cache_file ) ) { |
| 72 |
// 24h TTL in seconds. HOUR_IN_SECONDS is a WordPress constant defined |
| 73 |
// after this drop-in loads, so use a literal here. |
| 74 |
$xspeed_age = time() - filemtime( $xspeed_cache_file ); |
| 75 |
if ( $xspeed_age < 86400 ) { |
| 76 |
header( 'X-XSpeed-Cache: HIT' ); |
| 77 |
// 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. |
| 78 |
readfile( $xspeed_cache_file ); |
| 79 |
exit; |
| 80 |
} |
| 81 |
} |
| 82 |
|
