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<?php |
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/** |
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* Server / SAPI detection. |
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* |
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* Used by Gzip and the UI to decide which optimizations are server-applied |
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* (Apache / LiteSpeed via .htaccess) vs. require manual config (nginx). |
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* |
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* @package XSpeed |
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*/ |
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|
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namespace XSpeed; |
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|
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defined( 'ABSPATH' ) || exit; |
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|
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class Server { |
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|
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const APACHE = 'apache'; |
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const LITESPEED = 'litespeed'; |
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const NGINX = 'nginx'; |
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const IIS = 'iis'; |
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const UNKNOWN = 'unknown'; |
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|
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const OPT_CACHED_TYPE = 'xspeed_server_type'; |
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|
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public static function type() { |
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$detected = self::detect(); |
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if ( self::UNKNOWN !== $detected ) { |
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// Persist whenever we have a real answer so future CLI / |
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// cron / REST calls (where SERVER_SOFTWARE may be empty) |
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// inherit it. Non-autoloaded — only read when needed. |
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$cached = get_option( self::OPT_CACHED_TYPE, null ); |
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if ( $cached !== $detected ) { |
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update_option( self::OPT_CACHED_TYPE, $detected, false ); |
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} |
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return $detected; |
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} |
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|
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// No definitive signal this request (typically WP-CLI, where |
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// SERVER_SOFTWARE is empty). Read whatever was cached the last |
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// time we ran from a real HTTP request. |
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$cached = get_option( self::OPT_CACHED_TYPE, null ); |
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if ( is_string( $cached ) && '' !== $cached ) { |
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return $cached; |
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} |
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|
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return self::UNKNOWN; |
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} |
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|
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/** |
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* Live detection — never reads the cache. Used by type() and by |
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* any caller that explicitly wants the current-request answer |
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* (e.g. diagnostic UI showing "detected this request"). |
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* |
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* We DO NOT fall back to "if .htaccess exists assume Apache" here: |
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* Cache::install_rewrite() writes .htaccess itself, so on nginx |
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* hosts the file appears after first cache toggle and a presence |
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* check then flips us to APACHE forever. Cached HTTP detection |
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* is the cleaner backstop. |
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*/ |
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public static function detect(): string { |
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global $is_apache, $is_nginx, $is_IIS, $is_iis7; |
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|
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$signature = self::server_signature(); |
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|
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if ( false !== stripos( $signature, 'litespeed' ) ) { |
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return self::LITESPEED; |
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} |
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// apache_get_modules() exists only with mod_php (not FPM), so |
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// gate it behind SERVER_SOFTWARE first. Otherwise an |
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// "apache_get_modules exists" check would false-positive on a |
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// few PHP-builtin-server / mod_php-on-localhost dev edge cases. |
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if ( false !== stripos( $signature, 'apache' ) || ! empty( $is_apache ) ) { |
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return self::APACHE; |
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} |
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if ( false !== stripos( $signature, 'nginx' ) || ! empty( $is_nginx ) ) { |
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return self::NGINX; |
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} |
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if ( false !== stripos( $signature, 'microsoft-iis' ) || ! empty( $is_IIS ) || ! empty( $is_iis7 ) ) { |
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return self::IIS; |
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} |
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return self::UNKNOWN; |
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} |
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|
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/** |
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* Whether the server respects .htaccess / web.config-style file-based config. |
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*/ |
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public static function supports_htaccess() { |
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$t = self::type(); |
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return self::APACHE === $t || self::LITESPEED === $t; |
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} |
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|
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/** |
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* Best-effort path to the web server's access log, used to count |
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* static-rewrite HITs that bypass PHP on Apache/LiteSpeed (those |
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* requests are served straight from disk and never reach our |
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* Hit_Counter inline — see Hit_Counter::collect_server_log_hits()). |
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* |
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* Resolution order: |
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* 1. The `XSPEED_ACCESS_LOG` constant, if defined (explicit override |
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* for hosts where the log lives somewhere non-standard). |
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* 2. The `xspeed_access_log_path` filter (programmatic override). |
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* 3. Auto-detection: a short list of the standard Apache/LiteSpeed |
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* access-log locations, returning the first that exists AND is |
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* readable by the PHP user. |
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* |
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* Returns '' when nothing readable is found — a very common case on |
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* managed/cPanel hosts where the PHP user can't read the server log. |
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* Callers MUST treat '' as "can't count static hits here" and fall |
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* back gracefully (the drop-in path still counts its own HITs). |
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* |
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* @return string Absolute path, or '' if none is readable. |
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*/ |
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public static function access_log_path(): string { |
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if ( defined( 'XSPEED_ACCESS_LOG' ) && is_string( XSPEED_ACCESS_LOG ) && '' !== XSPEED_ACCESS_LOG ) { |
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$override = XSPEED_ACCESS_LOG; |
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return is_readable( $override ) ? $override : ''; |
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} |
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|
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/** |
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* Filter: xspeed_access_log_path |
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* |
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* Override the auto-detected access-log path. Return '' to disable |
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* server-log hit counting entirely. |
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* |
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* @param string|null $path Null = use auto-detection below. |
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*/ |
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$filtered = apply_filters( 'xspeed_access_log_path', null ); |
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if ( is_string( $filtered ) ) { |
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return ( '' !== $filtered && is_readable( $filtered ) ) ? $filtered : ''; |
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} |
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|
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// Auto-detect: the standard Apache + OpenLiteSpeed/LiteSpeed |
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// Enterprise access-log locations. First readable, NON-EMPTY file |
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// wins — an empty global access.log (common on LiteSpeed, which |
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// logs per-vhost instead) must not shadow the real per-vhost log we |
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// discover below. |
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$candidates = array( |
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'/var/log/apache2/access.log', // Debian/Ubuntu Apache |
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'/var/log/httpd/access_log', // RHEL/CentOS Apache |
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'/var/log/apache2/other_vhosts_access.log', // Debian multi-vhost |
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'/usr/local/lsws/logs/access.log', // OpenLiteSpeed global |
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'/var/log/lshttpd/access.log', // LiteSpeed Enterprise |
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); |
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foreach ( $candidates as $path ) { |
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if ( is_readable( $path ) && (int) @filesize( $path ) > 0 ) { // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- racey stat, treated as "skip". |
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return $path; |
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} |
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} |
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|
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// LiteSpeed (and some Apache vhost setups) write a per-vhost |
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// `<vhost>.access.log` rather than a single global file. Scan the |
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// known log dirs for the most-recently-written, readable, non-empty |
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// *.access.log and use that. Auto-tracks whichever vhost is serving |
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// this site without the admin having to set a path. |
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$dirs = array( '/usr/local/lsws/logs', '/var/log/lshttpd', '/var/log/apache2', '/var/log/httpd' ); |
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$best = ''; |
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$best_mtime = 0; |
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foreach ( $dirs as $dir ) { |
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if ( ! is_dir( $dir ) ) { |
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continue; |
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} |
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$globbed = glob( $dir . '/*access*log*' ); |
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if ( ! is_array( $globbed ) ) { |
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continue; |
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} |
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foreach ( $globbed as $path ) { |
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if ( ! is_readable( $path ) || (int) @filesize( $path ) === 0 ) { // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged |
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continue; |
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} |
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$mtime = (int) @filemtime( $path ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged |
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if ( $mtime > $best_mtime ) { |
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$best_mtime = $mtime; |
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$best = $path; |
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} |
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} |
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} |
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return $best; |
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} |
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|
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/** |
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* GZIP support category for the UI: |
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* 'auto' — toggling writes server config (Apache / LiteSpeed) |
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* 'manual' — must be configured outside the plugin (nginx, IIS, unknown) |
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*/ |
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public static function gzip_mode() { |
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return self::supports_htaccess() ? 'auto' : 'manual'; |
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} |
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|
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/** |
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* Is WordPress running inside a container (Docker / Podman / k8s)? |
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* |
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* Three signals checked in cheapness order, OR'd together: |
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* 1. /.dockerenv exists — Docker's traditional marker; rare absence. |
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* 2. /proc/self/mountinfo references /var/lib/docker/overlay2 or |
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* containerd/podman storage drivers — works under cgroup v2. |
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* 3. /proc/1/cgroup names docker / kubepods / containerd / podman / lxc |
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* — the cgroup v1 signal, still present on older Docker installs. |
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* |
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* Any single positive returns true. On non-Linux hosts (Windows / |
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* macOS / WSL host process), all three quietly return false and we |
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* fall back to "not containerized." |
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*/ |
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public static function is_containerized(): bool { |
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// 1. Docker marker file — cheap to stat, almost always present. |
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if ( file_exists( '/.dockerenv' ) ) { |
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return true; |
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} |
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// 2. mountinfo overlay2 / containerd footprint — works under cgroup v2. |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- /proc/self/mountinfo is a virtual file; WP_Filesystem doesn't model /proc. |
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$mounts = @file_get_contents( '/proc/self/mountinfo' ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- missing /proc on non-Linux hosts is the negative answer. |
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if ( is_string( $mounts ) && '' !== $mounts && preg_match( '#(docker/overlay2|/var/lib/containerd|/var/lib/podman)#i', $mounts ) ) { |
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return true; |
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} |
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// 3. cgroup v1 fallback. |
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// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- See above. |
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$cgroup = @file_get_contents( '/proc/1/cgroup' ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- See above. |
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if ( is_string( $cgroup ) && '' !== $cgroup && preg_match( '#(docker|kubepods|containerd|podman|lxc)#i', $cgroup ) ) { |
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return true; |
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} |
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return false; |
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} |
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|
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/** |
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* Is WordPress likely behind a reverse proxy (host nginx → container |
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* php-fpm, host nginx → docker nginx, etc.)? Detection is a heuristic |
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* built from the headers WordPress hands to PHP: when a proxy forwards |
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* the request it almost always sets X-Forwarded-* or X-Real-IP. |
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* |
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* False positives (CDN-only forwarding without a local reverse proxy) |
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* are acceptable — the caller uses this signal only to soften messaging |
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* that would otherwise mislead container-host customers. False negatives |
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* (proxy that strips headers) just mean we keep showing the snippet |
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* paste UX, which is the safe default. |
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*/ |
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public static function is_behind_proxy(): bool { |
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$proxy_headers = array( 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED_HOST', 'HTTP_X_FORWARDED_PROTO', 'HTTP_X_REAL_IP', 'HTTP_X_FORWARDED_SERVER' ); |
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foreach ( $proxy_headers as $h ) { |
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if ( ! empty( $_SERVER[ $h ] ) ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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|
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/** |
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* High-level topology classifier driving the rewrite-alert UX. |
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* |
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* Decides WHERE the user's nginx snippet needs to be installed |
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* (or whether automatic install via .htaccess covers it). The |
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* dashboard banner uses the return value to render the right |
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* "paste this here" message — there is no topology that can't |
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* benefit from xSpeed's static-rewrite; the question is only |
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* which nginx is in the cache file's filesystem. |
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* |
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* Returns one of: |
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* 'htaccess' — Apache / LiteSpeed; .htaccess block is |
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* installed automatically, no user action. |
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* 'nginx-host' — self-managed nginx on the host (no |
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* container in the request path). User |
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* pastes the snippet into their vhost |
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* (typically /etc/nginx/sites-enabled/<site>). |
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* 'nginx-container' — nginx running inside the same container |
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* as PHP. User pastes the snippet into the |
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* container's nginx config (typically |
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* docker/nginx.conf in the site's |
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* docker-compose dir). Host nginx (if any) |
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* is a reverse-proxy that just forwards |
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* bytes — snippet does NOT go there. |
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* 'unknown' — IIS or undetected; treat as manual. |
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*/ |
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public static function rewrite_topology(): string { |
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$type = self::type(); |
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if ( self::APACHE === $type || self::LITESPEED === $type ) { |
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return 'htaccess'; |
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} |
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if ( self::NGINX === $type ) { |
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return self::is_containerized() ? 'nginx-container' : 'nginx-host'; |
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} |
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return 'unknown'; |
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} |
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|
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private static function server_signature() { |
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return isset( $_SERVER['SERVER_SOFTWARE'] ) |
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? sanitize_text_field( wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) ) |
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: ''; |
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} |
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|
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/** |
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* Detect active caching plugins that would conflict with xSpeed. Returns |
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* a list of human-readable labels for any conflicting plugin currently |
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* active; empty array means the field is clear. Used by the onboarding |
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* wizard's Step 1 health check and (Phase 2.1) the main dashboard's |
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* Health card. |
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* |
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* The detection key is the plugin's main file path relative to the |
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* plugins directory — the same value WordPress uses internally in |
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* `active_plugins`. Folder-only checks (`is_plugin_active('foo/')`) |
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* would false-positive on disabled plugins still on disk. |
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*/ |
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public static function conflicts() { |
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if ( ! function_exists( 'is_plugin_active' ) ) { |
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require_once ABSPATH . 'wp-admin/includes/plugin.php'; |
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} |
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|
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$known = array( |
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'wp-rocket/wp-rocket.php' => 'WP Rocket', |
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'w3-total-cache/w3-total-cache.php' => 'W3 Total Cache', |
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'wp-super-cache/wp-cache.php' => 'WP Super Cache', |
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'wp-fastest-cache/wpFastestCache.php' => 'WP Fastest Cache', |
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'litespeed-cache/litespeed-cache.php' => 'LiteSpeed Cache', |
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'cache-enabler/cache-enabler.php' => 'Cache Enabler', |
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'comet-cache/comet-cache.php' => 'Comet Cache', |
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'hummingbird-performance/wp-hummingbird.php' => 'Hummingbird', |
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'sg-cachepress/sg-cachepress.php' => 'SG Optimizer', |
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'breeze/breeze.php' => 'Breeze', |
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'autoptimize/autoptimize.php' => 'Autoptimize', |
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'flying-press/flying-press.php' => 'FlyingPress', |
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'nitropack/main.php' => 'NitroPack', |
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); |
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|
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$active = array(); |
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foreach ( $known as $file => $label ) { |
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if ( is_plugin_active( $file ) ) { |
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$active[] = $label; |
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} |
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} |
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return $active; |
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} |
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} |
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|
