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* list($updateTime, $content) = getDbUpdateAndContent(); * $cg = new HTTP_ConditionalGet(array( * 'lastModifiedTime' => $updateTime * ,'isPublic' => true * )); * $cg->sendHeaders(); * if ($cg->cacheIsValid) { * exit(); * } * echo $content; * * * E.g. Shortcut for the above * * HTTP_ConditionalGet::check($updateTime, true); // exits if client has cache * echo $content; * * * E.g. Content from DB with no update time: * * $content = getContentFromDB(); * $cg = new HTTP_ConditionalGet(array( * 'contentHash' => md5($content) * )); * $cg->sendHeaders(); * if ($cg->cacheIsValid) { * exit(); * } * echo $content; * * * E.g. Static content with some static includes: * * // 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(); * } * * @package Minify * @subpackage HTTP * @author Stephen Clay */ 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) { $scope = (isset($spec['isPublic']) && $spec['isPublic']) ? 'public' : 'private'; $maxAge = 0; // backwards compatibility (can be removed later) if (isset($spec['setExpires']) && is_numeric($spec['setExpires']) && ! isset($spec['maxAge'])) { $spec['maxAge'] = $spec['setExpires'] - $_SERVER['REQUEST_TIME']; } if (isset($spec['maxAge'])) { $maxAge = $spec['maxAge']; $this->_headers['Expires'] = self::gmtDate( $_SERVER['REQUEST_TIME'] + $spec['maxAge'] ); } $etagAppend = ''; if (isset($spec['encoding'])) { $this->_stripEtag = true; if ('' !== $spec['encoding']) { $this->_headers['Vary'] = 'Accept-Encoding'; if (0 === strpos($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); } $privacy = ($scope === 'private') ? ', private' : ''; $this->_headers['Cache-Control'] = "max-age={$maxAge}{$privacy}"; // 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: * * array( * 'Cache-Control' => 'max-age=0, public' * ,'ETag' => '"foobar"' * ) * * * @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 * * * header('Expires: ' . HTTP_ConditionalGet::gmtdate($time)); * * * @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; /** * @param string $hash * * @param string $scope */ protected function _setEtag($hash, $scope) { $this->_etag = '"' . substr($scope, 0, 3) . $hash . '"'; $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; } $clientEtagList = PHP_VERSION_ID < 50400 && get_magic_quotes_gpc() ? stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) : $_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 $this->_headers['ETag'] = trim($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(';', $_SERVER['HTTP_IF_MODIFIED_SINCE'], 2); $date = new DateTime($ifModifiedSince, new DateTimeZone('UTC')); if ($date->getTimestamp() >= $this->_lmTime) { // Apache 2.2's behavior. If there was no ETag match, send the // non-encoded version of the ETag value. $this->_headers['ETag'] = $this->normalizeEtag($this->_etag); return true; } return false; } }