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Файловый менеджер - Редактировать - /home/infinitibizsol/public_html/wp-content/plugins/w3-total-cache/lib/Minify/HTTP/ConditionalGet.php

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<?php namespace W3TCL\Minify; /** * Class HTTP_ConditionalGet * @package Minify * @subpackage HTTP / /* * Implement conditional GET via a timestamp or hash of content * * E.g. Content from DB with update time: * <code> * list($updateTime, $content) = getDbUpdateAndContent(); * $cg = new HTTP_ConditionalGet(array( * 'lastModifiedTime' => $updateTime * ,'isPublic' => true * )); * $cg->sendHeaders(); * if ($cg->cacheIsValid) { * exit(); * } * echo $content; * </code> * * E.g. Shortcut for the above * <code> * HTTP_ConditionalGet::check($updateTime, true); // exits if client has cache * echo $content; * </code> * * E.g. Content from DB with no update time: * <code> * $content = getContentFromDB(); * $cg = new HTTP_ConditionalGet(array( * 'contentHash' => md5($content) * )); * $cg->sendHeaders(); * if ($cg->cacheIsValid) { * exit(); * } * echo $content; * </code> * * E.g. Static content with some static includes: * <code> * // before content * $cg = new HTTP_ConditionalGet(array( * 'lastUpdateTime' => max( * filemtime(__FILE__) * ,filemtime('/path/to/header.inc') * ,filemtime('/path/to/footer.inc') * ) * )); * $cg->sendHeaders(); * if ($cg->cacheIsValid) { * exit(); * } * </code> * @package Minify * @subpackage HTTP * @author Stephen Clay <steve@mrclay.org> / class HTTP_ConditionalGet { /* * Does the client have a valid copy of the requested resource? * * You'll want to check this after instantiating the object. If true, do * not send content, just call sendHeaders() if you haven't already. * * @var bool / public $cacheIsValid = null; /* * @param array $spec options * * 'isPublic': (bool) if false, the Cache-Control header will contain * "private", allowing only browser caching. (default false) * * 'lastModifiedTime': (int) if given, both ETag AND Last-Modified headers * will be sent with content. This is recommended. * * 'encoding': (string) if set, the header "Vary: Accept-Encoding" will * always be sent and a truncated version of the encoding will be appended * to the ETag. E.g. "pub123456;gz". This will also trigger a more lenient * checking of the client's If-None-Match header, as the encoding portion of * the ETag will be stripped before comparison. * * 'contentHash': (string) if given, only the ETag header can be sent with * content (only HTTP1.1 clients can conditionally GET). The given string * should be short with no quote characters and always change when the * resource changes (recommend md5()). This is not needed/used if * lastModifiedTime is given. * * 'eTag': (string) if given, this will be used as the ETag header rather * than values based on lastModifiedTime or contentHash. Also the encoding * string will not be appended to the given value as described above. * * 'invalidate': (bool) if true, the client cache will be considered invalid * without testing. Effectively this disables conditional GET. * (default false) * * 'maxAge': (int) if given, this will set the Cache-Control max-age in * seconds, and also set the Expires header to the equivalent GMT date. * After the max-age period has passed, the browser will again send a * conditional GET to revalidate its cache. / public function __construct($spec) { if (isset($spec['cacheHeaders']) && is_array($spec['cacheHeaders'])) { $this->_cacheHeaders = $spec['cacheHeaders']; } $scope = ($this->_cacheHeaders['cacheheaders_enabled'] && $this->_cacheHeaders['cacheheaders'] != 'no_cache') ? 'public' : 'private'; $maxAge = 0; $this->_headers['Pragma'] = $scope; // For backwards compatibility (will be removed in the future) if (isset($spec['setExpires']) && is_numeric($spec['setExpires']) && ! isset($spec['maxAge'])) { $spec['maxAge'] = $spec['setExpires'] - ( isset( $_SERVER['REQUEST_TIME'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_TIME'] ) ) : '' ); } if (isset($spec['maxAge']) && $this->_cacheHeaders['expires_enabled'] && $spec['maxAge']) { $maxAge = $spec['maxAge']; $this->_headers['Expires'] = self::gmtDate( ( isset( $_SERVER['REQUEST_TIME'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_TIME'] ) ) : '' ) + $spec['maxAge'] ); } $etagAppend = ''; if (isset($spec['encoding'])) { $this->_stripEtag = true; $this->_headers['Vary'] = 'Accept-Encoding'; if ('' !== $spec['encoding']) { if (0 === strpos($spec['encoding'], 'x-')) { $spec['encoding'] = substr($spec['encoding'], 2); } $etagAppend = ';' . substr($spec['encoding'], 0, 2); } } if (isset($spec['lastModifiedTime'])) { $this->_setLastModified($spec['lastModifiedTime']); if (isset($spec['eTag'])) { // Use it $this->_setEtag($spec['eTag'], $scope); } else { // base both headers on time $this->_setEtag($spec['lastModifiedTime'] . $etagAppend, $scope); } } elseif (isset($spec['eTag'])) { // Use it $this->_setEtag($spec['eTag'], $scope); } elseif (isset($spec['contentHash'])) { // Use the hash as the ETag $this->_setEtag($spec['contentHash'] . $etagAppend, $scope); } if ($this->_cacheHeaders['cacheheaders_enabled']) { switch ($this->_cacheHeaders['cacheheaders']) { case 'cache': $this->_headers['Cache-Control'] = 'public'; break; case 'cache_public_maxage': $this->_headers['Cache-Control'] = "max-age={$maxAge}, public"; break; case 'cache_validation': $this->_headers['Cache-Control'] = 'public, must-revalidate, proxy-revalidate'; break; case 'cache_noproxy': $this->_headers['Cache-Control'] = 'private, must-revalidate'; break; case 'cache_maxage': $this->_headers['Cache-Control'] = "max-age={$maxAge}, {$scope}, must-revalidate, proxy-revalidate"; break; case 'no_cache': $this->_headers['Cache-Control'] = 'max-age=0, private, no-store, no-cache, must-revalidate'; break; } } /* * Disable caching for preview mode / if (\W3TC\Util_Environment::is_preview_mode()) { $this->_headers = array_merge($this->_headers, array( 'Pragma' => 'private', 'Cache-Control' => 'private' )); } // invalidate cache if disabled, otherwise check $this->cacheIsValid = (isset($spec['invalidate']) && $spec['invalidate']) ? false : $this->_isCacheValid(); } /* * Get array of output headers to be sent * * In the case of 304 responses, this array will only contain the response * code header: array('_responseCode' => 'HTTP/1.0 304 Not Modified') * * Otherwise something like: * <code> * array( * 'Cache-Control' => 'max-age=0, public' * ,'ETag' => '"foobar"' * ) * </code> * * @return array / public function getHeaders() { return $this->_headers; } /* * Set the Content-Length header in bytes * * With most PHP configs, as long as you don't flush() output, this method * is not needed and PHP will buffer all output and set Content-Length for * you. Otherwise you'll want to call this to let the client know up front. * * @param int $bytes * * @return int copy of input $bytes / public function setContentLength($bytes) { return $this->_headers['Content-Length'] = $bytes; } /* * Send headers * * @see getHeaders() * * Note this doesn't "clear" the headers. Calling sendHeaders() will * call header() again (but probably have not effect) and getHeaders() will * still return the headers. * * @return null / public function sendHeaders() { $headers = $this->_headers; if (array_key_exists('_responseCode', $headers)) { // FastCGI environments require 3rd arg to header() to be set list(, $code) = explode(' ', $headers['_responseCode'], 3); header($headers['_responseCode'], true, $code); unset($headers['_responseCode']); } foreach ($headers as $name => $val) { header($name . ': ' . $val); } } /* * Exit if the client's cache is valid for this resource * * This is a convenience method for common use of the class * * @param int $lastModifiedTime if given, both ETag AND Last-Modified headers * will be sent with content. This is recommended. * * @param bool $isPublic (default false) if true, the Cache-Control header * will contain "public", allowing proxies to cache the content. Otherwise * "private" will be sent, allowing only browser caching. * * @param array $options (default empty) additional options for constructor / public static function check($lastModifiedTime = null, $isPublic = false, $options = array()) { if (null !== $lastModifiedTime) { $options['lastModifiedTime'] = (int)$lastModifiedTime; } $options['isPublic'] = (bool)$isPublic; $cg = new HTTP_ConditionalGet($options); $cg->sendHeaders(); if ($cg->cacheIsValid) { exit(); } } /* * Get a GMT formatted date for use in HTTP headers * * <code> * header('Expires: ' . HTTP_ConditionalGet::gmtdate($time)); * </code> * * @param int $time unix timestamp * * @return string / public static function gmtDate($time) { return gmdate('D, d M Y H:i:s \G\M\T', $time); } protected $_headers = array(); protected $_lmTime = null; protected $_etag = null; protected $_stripEtag = false; protected $_cacheHeaders = array( 'use_etag' => true, 'expires_enabled' => true, 'cacheheaders_enabled' => true, 'cacheheaders' => 'cache_validation' ); /* * @param string $hash * * @param string $scope / protected function _setEtag($hash, $scope) { $this->_etag = '"' . substr($scope, 0, 3) . $hash . '"'; if ($this->_cacheHeaders['use_etag']) $this->_headers['ETag'] = $this->_etag; } /* * @param int $time / protected function _setLastModified($time) { $this->_lmTime = (int)$time; $this->_headers['Last-Modified'] = self::gmtDate($time); } /* * Determine validity of client cache and queue 304 header if valid * * @return bool / protected function _isCacheValid() { if (null === $this->_etag) { // lmTime is copied to ETag, so this condition implies that the // server sent neither ETag nor Last-Modified, so the client can't // possibly has a valid cache. return false; } $isValid = ($this->resourceMatchedEtag() \|\| $this->resourceNotModified()); if ($isValid) { $this->_headers['_responseCode'] = 'HTTP/1.0 304 Not Modified'; } return $isValid; } /* * @return bool / protected function resourceMatchedEtag() { if (!isset($_SERVER['HTTP_IF_NONE_MATCH'])) { return false; } $clientEtagList = sanitize_text_field( wp_unslash( $_SERVER['HTTP_IF_NONE_MATCH'] ) ); $clientEtags = explode(',', $clientEtagList); $compareTo = $this->normalizeEtag($this->_etag); foreach ($clientEtags as $clientEtag) { if ($this->normalizeEtag($clientEtag) === $compareTo) { // respond with the client's matched ETag, even if it's not what // we would've sent by default if ($this->_cacheHeaders['use_etag']) $this->_headers['ETag'] = trim($clientEtag); return true; } } return false; } /* * @param string $etag * * @return string / protected function normalizeEtag($etag) { $etag = trim($etag); return $this->_stripEtag ? preg_replace('/;\\w\\w"$/', '"', $etag) : $etag; } /* * @return bool */ protected function resourceNotModified() { if (!isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) { return false; } // strip off IE's extra data (semicolon) list($ifModifiedSince) = explode(';', sanitize_text_field( wp_unslash( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ), 2); if (strtotime($ifModifiedSince) >= $this->_lmTime) { // Apache 2.2's behavior. If there was no ETag match, send the // non-encoded version of the ETag value. if ($this->_cacheHeaders['use_etag']) $this->_headers['ETag'] = $this->normalizeEtag($this->_etag); return true; } return false; } }