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Diffstat (limited to 'vendors/min/lib/HTTP/ConditionalGet.php')
| -rw-r--r-- | vendors/min/lib/HTTP/ConditionalGet.php | 348 |
1 files changed, 0 insertions, 348 deletions
diff --git a/vendors/min/lib/HTTP/ConditionalGet.php b/vendors/min/lib/HTTP/ConditionalGet.php deleted file mode 100644 index 823db058f..000000000 --- a/vendors/min/lib/HTTP/ConditionalGet.php +++ /dev/null @@ -1,348 +0,0 @@ -<?php -/** - * 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 $spec options - * - * 'isPublic': (bool) if true, the Cache-Control header will contain - * "public", allowing proxies to cache the content. Otherwise "private" will - * be sent, allowing only browser caching. (default false) - * - * 'lastModifiedTime': (int) if given, both ETag AND Last-Modified headers - * will be sent with content. This is recommended. - * - * 'encoding': (string) if set, the header "Vary: Accept-Encoding" will - * always be sent and a truncated version of the encoding will be appended - * to the ETag. E.g. "pub123456;gz". This will also trigger a more lenient - * checking of the client's If-None-Match header, as the encoding portion of - * the ETag will be stripped before comparison. - * - * 'contentHash': (string) if given, only the ETag header can be sent with - * content (only HTTP1.1 clients can conditionally GET). The given string - * should be short with no quote characters and always change when the - * resource changes (recommend md5()). This is not needed/used if - * lastModifiedTime is given. - * - * 'eTag': (string) if given, this will be used as the ETag header rather - * than values based on lastModifiedTime or contentHash. Also the encoding - * string will not be appended to the given value as described above. - * - * 'invalidate': (bool) if true, the client cache will be considered invalid - * without testing. Effectively this disables conditional GET. - * (default false) - * - * 'maxAge': (int) if given, this will set the Cache-Control max-age in - * seconds, and also set the Expires header to the equivalent GMT date. - * After the max-age period has passed, the browser will again send a - * conditional GET to revalidate its cache. - * - * @return null - */ - public function __construct($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; - $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); - } - $this->_headers['Cache-Control'] = "max-age={$maxAge}, {$scope}"; - // 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', $headers)) { - header($headers['_responseCode']); - 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 $options (default empty) additional options for constructor - * - * @return null - */ - public static function check($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 $_stripEtag = false; - - protected function _setEtag($hash, $scope) - { - $this->_etag = '"' . substr($scope, 0, 3) . $hash . '"'; - $this->_headers['ETag'] = $this->_etag; - } - - protected function _setLastModified($time) - { - $this->_lmTime = (int)$time; - $this->_headers['Last-Modified'] = self::gmtDate($time); - } - - /** - * Determine validity of client cache and queue 304 header if valid - */ - 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 $isValid; - } - - protected function resourceMatchedEtag() - { - if (!isset($_SERVER['HTTP_IF_NONE_MATCH'])) { - return false; - } - $clientEtagList = get_magic_quotes_gpc() - ? stripslashes($_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; - } - - protected function normalizeEtag($etag) { - $etag = trim($etag); - return $this->_stripEtag - ? preg_replace('/;\\w\\w"$/', '"', $etag) - : $etag; - } - - protected function resourceNotModified() - { - if (!isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) { - return false; - } - $ifModifiedSince = $_SERVER['HTTP_IF_MODIFIED_SINCE']; - if (false !== ($semicolon = strrpos($ifModifiedSince, ';'))) { - // IE has tacked on extra data to this header, strip it - $ifModifiedSince = substr($ifModifiedSince, 0, $semicolon); - } - if ($ifModifiedSince == self::gmtDate($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; - } -} |