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<?php |
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/** |
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* Cache Content |
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* |
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* This file is loaded when there's a chance the request content should be |
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* saved to cache. |
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* |
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* @package Surge |
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*/ |
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|
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namespace Surge; |
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|
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include_once( __DIR__ . '/common.php' ); |
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|
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/** |
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* The main output buffer callback. |
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* |
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* @param string $contents The buffer contents. |
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* |
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* @return string Contents. |
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*/ |
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$ob_callback = function( $contents ) { |
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$ttl = config( 'ttl' ); |
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|
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if ( $ttl < 1 ) { |
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return $contents; |
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} |
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|
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$skip = false; |
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|
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foreach ( headers_list() as $header ) { |
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list( $name, $value ) = array_map( 'trim', explode( ':', $header, 2 ) ); |
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|
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// Do not store or vary on these headers. |
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if ( in_array( strtolower( $name ), ['x-cache', 'x-powered-by'] ) ) { |
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continue; |
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} |
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|
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$headers[ $name ][] = $value; |
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|
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if ( strtolower( $name ) == 'set-cookie' ) { |
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$skip = true; |
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break; |
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} |
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|
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if ( strtolower( $name ) == 'cache-control' ) { |
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if ( stripos( $value, 'no-cache' ) !== false || stripos( $value, 'max-age=0' ) !== false ) { |
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$skip = true; |
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break; |
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} |
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} |
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} |
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|
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if ( ! empty( $_SERVER['HTTP_AUTHORIZATION'] ) ) { |
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$skip = true; |
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} |
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|
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if ( ! in_array( strtoupper( $_SERVER['REQUEST_METHOD'] ), [ 'GET', 'HEAD' ] ) ) { |
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$skip = true; |
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} |
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|
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if ( ! in_array( http_response_code(), [ 200, 301, 302, 404 ] ) ) { |
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$skip = true; |
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} |
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|
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if ( $skip ) { |
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return $contents; |
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} |
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|
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$key = key(); |
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|
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$meta = [ |
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'code' => http_response_code(), |
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'headers' => $headers, |
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'created' => time(), |
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'expires' => time() + $ttl, |
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'flags' => array_unique( flag() ), |
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'path' => $key['path'], |
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]; |
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|
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$meta = json_encode( $meta ); |
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$cache_key = md5( json_encode( $key ) ); |
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$level = substr( $cache_key, -2 ); |
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|
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if ( ! wp_mkdir_p( CACHE_DIR . "/{$level}/" ) ) { |
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return $contents; |
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} |
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|
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// Open a new cache file. |
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$hash = wp_generate_password( 6, false ); |
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$f = fopen( CACHE_DIR . "/{$level}/{$cache_key}.{$hash}.php", 'xb' ); |
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|
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// Could not create file. |
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if ( false === $f ) { |
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return $contents; |
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} |
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|
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fwrite( $f, '<?php exit; ?>' ); |
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fwrite( $f, pack( 'L', strlen( $meta ) ) ); |
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fwrite( $f, $meta ); |
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fwrite( $f, $contents ); |
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|
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// Close the file. |
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fclose( $f ); |
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|
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// Atomic (hopefully) rename. |
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if ( ! rename( CACHE_DIR . "/{$level}/{$cache_key}.{$hash}.php", |
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CACHE_DIR . "/{$level}/{$cache_key}.php" ) |
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) { |
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unlink( CACHE_DIR . "/{$level}/{$cache_key}.{$hash}.php" ); |
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} |
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|
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return $contents; |
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}; |
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|
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// Attach to main output buffer. |
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ob_start( $ob_callback ); |
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|
