<?php
/**
* Forked from https://github.com/tlovett1/simple-cache/
*/
defined( 'ABSPATH' ) || exit;
$powered_cache_start_time = microtime( true );
// Don't cache robots.txt or htacesss
if ( strpos( $_SERVER['REQUEST_URI'], 'robots.txt' ) !== false || strpos( $_SERVER['REQUEST_URI'], '.htaccess' ) !== false ) {
powered_cache_add_cache_miss_header( "Uncacheable file" );
return;
}
// Don't cache non-GET requests
if ( ! isset( $_SERVER['REQUEST_METHOD'] ) || 'GET' !== $_SERVER['REQUEST_METHOD'] ) {
powered_cache_add_cache_miss_header( "Invalid request method" );
return;
}
if ( ! isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
$_SERVER['HTTP_USER_AGENT'] = '';
}
// Don't cache wp-admin
if ( is_admin() ) {
return;
}
$file_extension = $_SERVER['REQUEST_URI'];
$file_extension = preg_replace( '#^(.*?)\?.*$#', '$1', $file_extension );
$file_extension = trim( preg_replace( '#^.*\.(.*)$#', '$1', $file_extension ) );
// Don't cache disallowed extensions. Prevents wp-cron.php, xmlrpc.php, etc.
if ( ! preg_match( '#index\.php$#i', $_SERVER['REQUEST_URI'] ) && in_array( $file_extension, array( 'php', 'xml', 'xsl' ), true ) ) {
powered_cache_add_cache_miss_header( "Disallowed file extension" );
return;
}
if ( ! $GLOBALS['powered_cache_options']['enable_page_cache'] ) {
powered_cache_add_cache_miss_header( "Page Caching is not enabled" );
return;
}
if ( isset( $_GET['nopoweredcache'] ) && $_GET['nopoweredcache'] ) {
powered_cache_add_cache_miss_header( "Passing nopoweredcache with the query" );
return;
}
// Don't cache page with these user agents
if ( isset( $powered_cache_rejected_user_agents ) && ! empty( $powered_cache_rejected_user_agents ) ) {
$rejected_user_agents = implode( '|', $powered_cache_rejected_user_agents );
if ( ! empty( $rejected_user_agents ) && isset( $_SERVER['HTTP_USER_AGENT'] ) && preg_match( '#(' . $rejected_user_agents . ')#', $_SERVER['HTTP_USER_AGENT'] ) ) {
powered_cache_add_cache_miss_header( "Rejected user agent" );
return;
}
}
// dont cache mobile
if ( empty( $GLOBALS['powered_cache_options']['cache_mobile'] ) ) {
global $powered_cache_mobile_browsers, $powered_cache_mobile_prefixes;
$mobile_browsers = addcslashes( implode( '|', preg_split( '/[\s*,\s*]*,+[\s*,\s*]*/', $powered_cache_mobile_browsers ) ), ' ' );
$mobile_prefixes = addcslashes( implode( '|', preg_split( '/[\s*,\s*]*,+[\s*,\s*]*/', $powered_cache_mobile_prefixes ) ), ' ' );
// Don't cache if mobile detection is activated
if ( ( preg_match( '#^.*(' . $mobile_browsers . ').*#i', $_SERVER['HTTP_USER_AGENT'] ) || preg_match( '#^(' . $mobile_prefixes . ').*#i', substr( $_SERVER['HTTP_USER_AGENT'], 0, 4 ) ) ) ) {
powered_cache_add_cache_miss_header( "Mobile request" );
return;
}
}
if ( ! empty( $_COOKIE ) ) {
$wp_cookies = [ 'wordpressuser_', 'wordpresspass_', 'wordpress_sec_', 'wordpress_logged_in_' ];
$comment_cookies = [ 'comment_author_', 'comment_author_email_', 'comment_author_url_' ];
//Don't cache if logged in
if ( ! isset( $GLOBALS['powered_cache_options']['loggedin_user_cache'] ) || false === $GLOBALS['powered_cache_options']['loggedin_user_cache'] ) {
// check logged-in cookie
foreach ( $_COOKIE as $key => $value ) {
foreach ( $wp_cookies as $cookie ) {
if ( strpos( $key, $cookie ) !== false ) {
// Logged in!
powered_cache_add_cache_miss_header( "User logged-in" );
return;
}
}
foreach ( $comment_cookies as $cookie ) {
if ( strpos( $key, $cookie ) !== false ) {
// Commented on the site!
powered_cache_add_cache_miss_header( "User left a comment" );
return;
}
}
}
}
if ( ! empty( $_COOKIE['powered_cache_commented_posts'] ) ) {
foreach ( $_COOKIE['powered_cache_commented_posts'] as $path ) {
if ( rtrim( $path, '/' ) === rtrim( $_SERVER['REQUEST_URI'], '/' ) ) {
// User commented on this post
powered_cache_add_cache_miss_header( "User commented" );
return;
}
}
}
// don't cache specific cookie
if ( isset( $powered_cache_rejected_cookies ) && ! empty( $powered_cache_rejected_cookies ) ) {
$rejected_cookies = array_diff( $powered_cache_rejected_cookies, $wp_cookies, $comment_cookies ); // use diff in case caching for logged-in user
$rejected_cookies = implode( '|', $rejected_cookies );
if ( preg_match( '#(' . $rejected_cookies . ')#', var_export( $_COOKIE, true ) ) ) {
powered_cache_add_cache_miss_header( "Rejected cookie" );
return;
}
}
}
// Don't cache rejected pages
if ( ! empty( $powered_cache_rejected_uri ) ) {
foreach ( (array) $powered_cache_rejected_uri as $exception ) {
if ( preg_match( '#^[\s]*$#', $exception ) ) {
continue;
}
// full url exception
if ( preg_match( '#^https?://#', $exception ) ) {
$exception = parse_url( $exception, PHP_URL_PATH );
}
if ( empty( $exception ) ) {
continue;
}
if ( preg_match( '#^(' . $exception . ')$#', $_SERVER['REQUEST_URI'] ) ) {
powered_cache_add_cache_miss_header( "Rejected page" );
return;
}
}
}
if ( ! empty( $_GET ) ) {
if ( ! isset( $powered_cache_ignored_query_strings ) ) {
$powered_cache_ignored_query_strings = [];
}
$query_params = array_diff_key( $_GET, array_flip( $powered_cache_ignored_query_strings ) );
if ( ! isset( $powered_cache_cache_query_strings ) ) {
$powered_cache_cache_query_strings = [];
}
// don't cache when there is not allowed query parameter exists
if ( ! empty( $query_params ) && ! array_intersect_key( $_GET, array_flip( $powered_cache_cache_query_strings ) ) ) {
powered_cache_add_cache_miss_header( "Disallowed query parameter exists" );
return;
}
}
powered_cache_serve_cache();
ob_start( 'powered_cache_page_buffer' );
/**
* Cache output before it goes to the browser
*
* @param string $buffer
* @param int $flags
*
* @return string
* @since 1.0
*/
function powered_cache_page_buffer( $buffer, $flags ) {
global $powered_cache_start_time, $post;
if ( strlen( $buffer ) < 255 ) {
return $buffer;
}
// maybe we shouldn't cache template file has this constant
// dont check DONOTCACHEPAGE strictly some plugins define string instead bool flag
if ( defined( 'DONOTCACHEPAGE' ) && DONOTCACHEPAGE ) {
\PoweredCache\Utils\log( sprintf( 'DONOTCACHEPAGE DEFINED on %s', $_SERVER['REQUEST_URI'] ) );
powered_cache_add_cache_miss_header( "DONOTCACHEPAGE defined" );
return $buffer;
}
// Don't cache password protected posts
if ( ! empty( $post->post_password ) ) {
powered_cache_add_cache_miss_header( "Password protected posts are not cached" );
return $buffer;
}
// Don't cache 404 results
if ( function_exists( 'is_404' ) && is_404() ) {
powered_cache_add_cache_miss_header( "404 pages are not cached" );
return $buffer;
}
// Don't cache search results
if ( function_exists( 'is_search' ) && is_search() ) {
powered_cache_add_cache_miss_header( "Search result page is not cached" );
return $buffer;
}
/**
* Filter whether to enable page cache for this request
*
* @hook powered_cache_page_cache_enable
*
* @param {boolean} $enable true for caching
*
* @since 1.0
*/
if ( true !== apply_filters( 'powered_cache_page_cache_enable', true ) ) {
powered_cache_add_cache_miss_header( "Page Cache not enabled for this post" );
return $buffer;
}
// only cache when http ok
if ( 200 !== http_response_code() ) {
powered_cache_add_cache_miss_header( "Response code is not 200" );
return $buffer;
}
if ( ! function_exists( '\PoweredCache\Utils\get_cache_dir' ) ) {
return $buffer;
}
// Make sure we can read/write files and that proper folders exist
if ( ! file_exists( untrailingslashit( \PoweredCache\Utils\get_cache_dir() ) ) ) {
if ( ! @mkdir( untrailingslashit( \PoweredCache\Utils\get_cache_dir() ) ) ) {
// Can not cache!
powered_cache_add_cache_miss_header( "The cache directory does not exist for storing cached output" );
return $buffer;
}
}
if ( ! file_exists( \PoweredCache\Utils\get_page_cache_dir() ) ) {
if ( ! @mkdir( \PoweredCache\Utils\get_page_cache_dir() ) ) {
// Can not cache!
powered_cache_add_cache_miss_header( "The page cache directory does not exist for storing cached output" );
return $buffer;
}
}
/**
* Filters HTML buffer
*
* @hook powered_cache_page_caching_buffer
*
* @param {string} $buffer Output buffer.
*
* @return {string} New value.
* @since 1.0
*/
$buffer = apply_filters( 'powered_cache_page_caching_buffer', $buffer );
$url_path = powered_cache_get_url_path();
$dirs = explode( '/', $url_path );
$path = untrailingslashit( \PoweredCache\Utils\get_page_cache_dir() );
foreach ( $dirs as $dir ) {
if ( ! empty( $dir ) ) {
$path .= '/' . $dir;
if ( ! file_exists( $path ) ) {
if ( ! @mkdir( $path ) ) {
// Can not cache!
return $buffer;
}
}
}
}
$modified_time = time(); // Make sure modified time is consistent
$generation_time = number_format( microtime( true ) - $powered_cache_start_time, 3 );
$home_url = get_home_url();
// prevent mixed content
if ( ! is_ssl() && 'https' === strtolower( parse_url( $home_url, PHP_URL_SCHEME ) ) ) {
$https_home_url = $home_url;
$http_home_url = str_replace( 'https://', 'http://', $https_home_url );
$buffer = str_replace( esc_url( $http_home_url ), esc_url( $https_home_url ), $buffer );
}
if ( array_key_exists( 'cache_footprint', $GLOBALS['powered_cache_options'] ) && true === $GLOBALS['powered_cache_options']['cache_footprint'] ) {
if ( preg_match( '#</html>#i', $buffer ) ) {
$buffer .= PHP_EOL;
$buffer .= "<!-- Cache served by Powered Cache -->";
$buffer .= PHP_EOL;
$buffer .= "<!-- If you like fast websites like this, visit: https://poweredcache.com -->";
$buffer .= PHP_EOL;
$buffer .= "<!-- Last modified: " . gmdate( 'D, d M Y H:i:s', $modified_time ) . " GMT -->";
$buffer .= PHP_EOL;
$buffer .= "<!-- Dynamic page generated in $generation_time -->";
$buffer .= PHP_EOL;
if ( false !== stripos( $_SERVER['HTTP_USER_AGENT'], 'Powered Cache Preloader' ) ) {
$buffer .= "<!-- This page is preloaded by Powered Cache Preloader -->";
$buffer .= PHP_EOL;
}
}
}
$meta_file_name = 'meta.php';
$meta_file = '<?php exit; ?>' . PHP_EOL;
$meta_params = array(); // holds to metadata for cached file
$response_headers = \PoweredCache\Utils\get_response_headers();
foreach ( (array) $response_headers as $key => $value ) {
$meta_params['headers'][ $key ] = "$key: $value";
}
/**
* Filters meta parameters.
*
* @hook powered_cache_page_cache_meta_params
*
* @param {array} $meta_params Meta parameters.
* @param {array} $response_headers Supported response header list.
*
* @return {array} New value.
* @since 1.2
*/
$meta_params = apply_filters( 'powered_cache_page_cache_meta_params', $meta_params, $response_headers );
$meta_file_contents = $meta_file . json_encode( $meta_params );
/**
* Filters meta file contents.
*
* @hook powered_cache_page_cache_meta_info
*
* @param {string} $meta_file_contents The content of the meta file.*
*
* @return {array} New value.
* @since 1.2
*/
$meta_file_contents = apply_filters( 'powered_cache_page_cache_meta_info', $meta_file_contents );
file_put_contents( $path . '/' . $meta_file_name, $meta_file_contents );
touch( $path . '/' . $meta_file_name, $modified_time );
if ( ! empty( $meta_params['headers']['Content-Type'] ) ) {
$index_name = powered_cache_index_file( $meta_params['headers']['Content-Type'] );
} else {
$index_name = powered_cache_index_file();
}
if ( $GLOBALS['powered_cache_options']['gzip_compression'] && function_exists( 'gzencode' ) ) {
file_put_contents( $path . '/' . $index_name, gzencode( $buffer, 3 ) );
touch( $path . '/' . $index_name, $modified_time );
} else {
file_put_contents( $path . '/' . $index_name, $buffer );
touch( $path . '/' . $index_name, $modified_time );
}
/**
* Fires after caching a page.
*
* @hook powered_cache_page_cached
*
* @param {string} $buffer HTML Output.
*
* @since 1.0
*/
do_action( 'powered_cache_page_cached', $buffer );
header( 'Cache-Control: no-cache' ); // Check back every time to see if re-download is necessary
header( 'X-Powered-Cache: MISS' );
header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', $modified_time ) . ' GMT' );
if ( function_exists( 'ob_gzhandler' ) && $GLOBALS['powered_cache_options']['gzip_compression'] ) {
return ob_gzhandler( $buffer, $flags );
} else {
return $buffer;
}
}
/**
* Optionally serve cache and exit
*
* @since 1.0
*/
function powered_cache_serve_cache() {
global $powered_cache_slash_check;
$path = rtrim( $GLOBALS['powered_cache_options']['cache_location'], '/' ) . '/powered-cache/' . rtrim( powered_cache_get_url_path(), '/' ) . '/';
$meta_file = $path . '/meta.php';
$header_params = [];
$content_type = 'text/html';
if ( @file_exists( $meta_file ) ) {
$meta_contents = trim( file_get_contents( $meta_file ) );
$meta_contents = str_replace( '<?php exit; ?>', '', $meta_contents );
$meta_params = json_decode( trim( $meta_contents ), true );
$header_params = $meta_params['headers'];
}
if ( ! empty( $header_params['Content-Type'] ) ) {
$content_type = $header_params['Content-Type'];
}
$file_name = powered_cache_index_file( $content_type );
$file_path = $path . $file_name;
// check file exists?
if ( ! file_exists( $file_path ) ) {
return;
}
$modified_time = (int) @filemtime( $file_path );
header( 'Cache-Control: no-cache' ); // Check back in an hour
if ( ! empty( $modified_time ) && ! empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) && strtotime( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) === $modified_time ) {
header( $_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified', true, 304 );
exit;
}
// trailingslash check
if ( isset( $powered_cache_slash_check ) && $powered_cache_slash_check ) {
$current_path = parse_url( $_SERVER['REQUEST_URI'], PHP_URL_PATH );
if ( ! empty( $current_path ) && '/' !== substr( $current_path, - 1 ) ) {
header( 'X-Powered-Cache: Passing to WordPress' );
return;
}
}
if ( @file_exists( $file_path ) && @is_readable( $file_path ) ) {
if ( ! empty( $header_params ) ) {
foreach ( $header_params as $key => $response_header ) {
header( $response_header );
}
}
header( 'X-Powered-Cache: PHP' );
header( 'X-Cache-Enabled: true' );
header( sprintf( "age: %d", time() - filemtime( $file_path ) ) );
if ( function_exists( 'gzencode' ) && $GLOBALS['powered_cache_options']['gzip_compression'] ) {
header( 'Content-Encoding: gzip' );
}
@readfile( $file_path );
exit;
}
}
/**
* Get URL path for caching
*
* @return string
* @since 1.0
* @since 2.0 $request_uri without query string
*/
function powered_cache_get_url_path() {
$host = ( isset( $_SERVER['HTTP_HOST'] ) ? $_SERVER['HTTP_HOST'] : '' );
$request_uri = explode( '?', $_SERVER['REQUEST_URI'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
$request_uri = reset( $request_uri );
$request_uri = preg_replace( '/(\/+)/', '/', $request_uri );
$request_uri = str_replace( '..', '', preg_replace( '/[ <>\'\"\r\n\t\(\)]/', '', $request_uri ) );
return rtrim( $host, '/' ) . $request_uri;
}
function powered_cache_get_user_cookie() {
if ( empty( $_COOKIE ) ) {
return false;
}
foreach ( $_COOKIE as $c_key => $val ) {
if ( false !== strpos( $c_key, 'wordpress_logged_in_' ) ) {
return $val;
}
}
return false;
}
/**
* Determines cache file names
*
* @param string $content_type
*
* @return string
* @since 1.2 `$content_type`
* @since 1.0
*/
function powered_cache_index_file( $content_type = 'text/html' ) {
global $powered_cache_mobile_browsers, $powered_cache_mobile_prefixes, $powered_cache_vary_cookies, $powered_cache_cache_query_strings;
$file_name = 'index';
if ( is_ssl() ) {
$file_name .= '-https';
}
// separate file for mobile cache
if ( ! empty( $GLOBALS['powered_cache_options']['cache_mobile'] ) && ! empty( $GLOBALS['powered_cache_options']['cache_mobile_separate_file'] ) ) {
$mobile_browsers = addcslashes( implode( '|', preg_split( '/[\s*,\s*]*,+[\s*,\s*]*/', $powered_cache_mobile_browsers ) ), ' ' );
$mobile_prefixes = addcslashes( implode( '|', preg_split( '/[\s*,\s*]*,+[\s*,\s*]*/', $powered_cache_mobile_prefixes ) ), ' ' );
// Don't cache if mobile detection is activated
if ( ( preg_match( '#^.*(' . $mobile_browsers . ').*#i', $_SERVER['HTTP_USER_AGENT'] ) || preg_match( '#^(' . $mobile_prefixes . ').*#i', substr( $_SERVER['HTTP_USER_AGENT'], 0, 4 ) ) ) ) {
$file_name .= '-mobile';
}
}
if ( ! empty( $GLOBALS['powered_cache_options']['loggedin_user_cache'] ) ) {
$usr_cookie = powered_cache_get_user_cookie();
if ( false !== $usr_cookie ) {
$cookie_info = explode( '|', $usr_cookie );
// user specific cache dir
$file_name .= '_' . $cookie_info[0] . '-' . $cookie_info[1];
}
}
// change filename based on vary cookies
if ( ! empty( $powered_cache_vary_cookies ) ) {
$cookie_file_name = '';
foreach ( $powered_cache_vary_cookies as $key => $vary_cookie ) {
if ( is_array( $vary_cookie ) ) {
if ( ! empty( $_COOKIE[ $key ] ) ) {
foreach ( $vary_cookie as $vary_sub_cookie ) {
if ( isset( $_COOKIE[ $key ][ $vary_sub_cookie ] ) ) {
$cookie_value = preg_replace( '/[^A-Za-z0-9. -]/', '', $_COOKIE[ $key ][ $vary_sub_cookie ] );
$cookie_file_name .= strtolower( $key . $vary_sub_cookie . $cookie_value );
}
}
}
continue;
}
if ( isset( $_COOKIE[ $vary_cookie ] ) && ! empty( $_COOKIE[ $vary_cookie ] ) ) {
$cookie_value = preg_replace( '/[^A-Za-z0-9. -]/', '', $_COOKIE[ $vary_cookie ] );
$cookie_file_name .= strtolower( $vary_cookie . $cookie_value );
}
}
if ( ! empty( $cookie_file_name ) ) {
/**
* Hashing for no particular reason
* preg_replace( '/[^a-z0-9_\-]/', '', strtolower( $cookie_file_name ) )
* can create a messy filename
*/
$file_name .= '-' . sha1( $cookie_file_name );
}
}
// change filename for provided cache query string
if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
parse_str( $_SERVER['QUERY_STRING'], $query_string );
$qs_variable = '';
sort( $powered_cache_cache_query_strings );
foreach ( $powered_cache_cache_query_strings as $query_parameter ) {
if ( isset( $query_string[ $query_parameter ] ) ) {
$qs_variable .= '_' . $query_parameter;
$qs_variable .= is_array( $query_string[ $query_parameter ] ) ? implode( '|', $query_string[ $query_parameter ] ) : $query_string[ $query_parameter ];
}
}
if ( ! empty( $qs_variable ) ) {
$qs_variable = 'query_' . $qs_variable;
$file_name .= '_' . sha1( $qs_variable );
}
}
/**
* Content-Type is not always text/html (like feed, wp-json etc..)
* Adding hash by simply escaping from rewrite matches in htaccess or nginx
* Different types of content should be serve via PHP, in order to restore header info
*/
if ( false === strpos( $content_type, 'text/html' ) ) {
$file_name .= '-' . substr( sha1( $content_type ), 0, 6 );
}
$file_name .= '.html';
if ( function_exists( 'gzencode' ) && $GLOBALS['powered_cache_options']['gzip_compression'] ) {
$file_name .= '.gz';
}
return $file_name;
}
/**
* Add cache miss header and reason
*
* @param string $reason Cache Miss info
*
* @since 2.2
*/
function powered_cache_add_cache_miss_header( $reason ) {
if ( headers_sent() ) {
return;
}
header( 'X-Powered-Cache: MISS' );
if ( ( defined( 'POWERED_CACHE_ENABLE_LOG' ) && POWERED_CACHE_ENABLE_LOG )
|| ( defined( 'POWERED_CACHE_MISS_REASON' ) && POWERED_CACHE_MISS_REASON )
) {
header( "X-Powered-Cache-Miss-Reason: $reason" );
}
}