Squashed 'mod/minify/' content from commit 5949018

git-subtree-dir: mod/minify
git-subtree-split: 594901859d5afc1fa364322428bd7a6d5c6a3f96

2 files changed, 674 insertions, 0 deletions

diff --git a/vendors/min/lib/HTTP/ConditionalGet.php b/vendors/min/lib/HTTP/ConditionalGet.php
new file mode 100644
index 000000000..823db058f
--- /dev/null
+++ b/vendors/min/lib/HTTP/ConditionalGet.php
@@ -0,0 +1,348 @@
+<?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;
+    }
+}
diff --git a/vendors/min/lib/HTTP/Encoder.php b/vendors/min/lib/HTTP/Encoder.php
new file mode 100644
index 000000000..66c26789c
--- /dev/null
+++ b/vendors/min/lib/HTTP/Encoder.php
@@ -0,0 +1,326 @@
+<?php
+/**
+ * Class HTTP_Encoder  
+ * @package Minify
+ * @subpackage HTTP
+ */
+ 
+/**
+ * Encode and send gzipped/deflated content
+ *
+ * The "Vary: Accept-Encoding" header is sent. If the client allows encoding, 
+ * Content-Encoding and Content-Length are added.
+ *
+ * <code>
+ * // Send a CSS file, compressed if possible
+ * $he = new HTTP_Encoder(array(
+ *     'content' => file_get_contents($cssFile)
+ *     ,'type' => 'text/css'
+ * ));
+ * $he->encode();
+ * $he->sendAll();
+ * </code>
+ *
+ * <code>
+ * // Shortcut to encoding output
+ * header('Content-Type: text/css'); // needed if not HTML
+ * HTTP_Encoder::output($css);
+ * </code>
+ * 
+ * <code>
+ * // Just sniff for the accepted encoding
+ * $encoding = HTTP_Encoder::getAcceptedEncoding();
+ * </code>
+ *
+ * For more control over headers, use getHeaders() and getData() and send your
+ * own output.

+ * 

+ * Note: If you don't need header mgmt, use PHP's native gzencode, gzdeflate, 

+ * and gzcompress functions for gzip, deflate, and compress-encoding

+ * respectively.

+ * 
+ * @package Minify
+ * @subpackage HTTP
+ * @author Stephen Clay <steve@mrclay.org>
+ */
+class HTTP_Encoder {
+
+    /**
+     * Should the encoder allow HTTP encoding to IE6? 
+     * 
+     * If you have many IE6 users and the bandwidth savings is worth troubling 
+     * some of them, set this to true.
+     * 
+     * By default, encoding is only offered to IE7+. When this is true,
+     * getAcceptedEncoding() will return an encoding for IE6 if its user agent
+     * string contains "SV1". This has been documented in many places as "safe",
+     * but there seem to be remaining, intermittent encoding bugs in patched 
+     * IE6 on the wild web.
+     * 
+     * @var bool
+     */
+    public static $encodeToIe6 = false;
+    
+    
+    /**
+     * Default compression level for zlib operations
+     * 
+     * This level is used if encode() is not given a $compressionLevel
+     * 
+     * @var int
+     */
+    public static $compressionLevel = 6;
+    
+
+    /**
+     * Get an HTTP Encoder object
+     * 
+     * @param array $spec options
+     * 
+     * 'content': (string required) content to be encoded
+     * 
+     * 'type': (string) if set, the Content-Type header will have this value.
+     * 
+     * 'method: (string) only set this if you are forcing a particular encoding
+     * method. If not set, the best method will be chosen by getAcceptedEncoding()
+     * The available methods are 'gzip', 'deflate', 'compress', and '' (no
+     * encoding)
+     * 
+     * @return null
+     */
+    public function __construct($spec) 

+    {
+        $this->_content = $spec['content'];
+        $this->_headers['Content-Length'] = (string)strlen($this->_content);
+        if (isset($spec['type'])) {
+            $this->_headers['Content-Type'] = $spec['type'];
+        }
+        if (isset($spec['method'])
+            && in_array($spec['method'], array('gzip', 'deflate', 'compress', '')))
+        {
+            $this->_encodeMethod = array($spec['method'], $spec['method']);
+        } else {
+            $this->_encodeMethod = self::getAcceptedEncoding();
+        }
+    }
+
+    /**
+     * Get content in current form
+     * 
+     * Call after encode() for encoded content.
+     * 
+     * return string
+     */
+    public function getContent() 

+    {
+        return $this->_content;
+    }
+    
+    /**
+     * Get array of output headers to be sent
+     * 
+     * E.g.
+     * <code>
+     * array(
+     *     'Content-Length' => '615'
+     *     ,'Content-Encoding' => 'x-gzip'
+     *     ,'Vary' => 'Accept-Encoding'
+     * )
+     * </code>
+     *
+     * @return array 
+     */
+    public function getHeaders()

+    {
+        return $this->_headers;
+    }
+
+    /**
+     * Send output headers
+     * 
+     * You must call this before headers are sent and it probably cannot be
+     * used in conjunction with zlib output buffering / mod_gzip. Errors are
+     * not handled purposefully.
+     * 
+     * @see getHeaders()
+     * 
+     * @return null
+     */
+    public function sendHeaders()

+    {
+        foreach ($this->_headers as $name => $val) {
+            header($name . ': ' . $val);
+        }
+    }
+    
+    /**
+     * Send output headers and content
+     * 
+     * A shortcut for sendHeaders() and echo getContent()
+     *
+     * You must call this before headers are sent and it probably cannot be
+     * used in conjunction with zlib output buffering / mod_gzip. Errors are
+     * not handled purposefully.
+     * 
+     * @return null
+     */
+    public function sendAll()

+    {
+        $this->sendHeaders();
+        echo $this->_content;
+    }
+
+    /**
+     * Determine the client's best encoding method from the HTTP Accept-Encoding 
+     * header.
+     * 
+     * If no Accept-Encoding header is set, or the browser is IE before v6 SP2,
+     * this will return ('', ''), the "identity" encoding.
+     * 
+     * A syntax-aware scan is done of the Accept-Encoding, so the method must
+     * be non 0. The methods are favored in order of gzip, deflate, then 
+     * compress. Deflate is always smallest and generally faster, but is 
+     * rarely sent by servers, so client support could be buggier.
+     * 

+     * @param bool $allowCompress allow the older compress encoding
+     * 
+     * @param bool $allowDeflate allow the more recent deflate encoding

+     * 
+     * @return array two values, 1st is the actual encoding method, 2nd is the
+     * alias of that method to use in the Content-Encoding header (some browsers
+     * call gzip "x-gzip" etc.)
+     */
+    public static function getAcceptedEncoding($allowCompress = true, $allowDeflate = true)

+    {
+        // @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
+        
+        if (! isset($_SERVER['HTTP_ACCEPT_ENCODING'])
+            || self::_isBuggyIe())
+        {
+            return array('', '');
+        }
+        $ae = $_SERVER['HTTP_ACCEPT_ENCODING'];
+        // gzip checks (quick)
+        if (0 === strpos($ae, 'gzip,')             // most browsers
+            || 0 === strpos($ae, 'deflate, gzip,') // opera
+        ) {
+            return array('gzip', 'gzip');
+        }
+        // gzip checks (slow)
+        if (preg_match(
+                '@(?:^|,)\\s*((?:x-)?gzip)\\s*(?:$|,|;\\s*q=(?:0\\.|1))@'
+                ,$ae
+                ,$m)) {
+            return array('gzip', $m[1]);
+        }
+        if ($allowDeflate) {
+            // deflate checks    
+            $aeRev = strrev($ae);
+            if (0 === strpos($aeRev, 'etalfed ,') // ie, webkit
+                || 0 === strpos($aeRev, 'etalfed,') // gecko
+                || 0 === strpos($ae, 'deflate,') // opera
+                // slow parsing
+                || preg_match(
+                    '@(?:^|,)\\s*deflate\\s*(?:$|,|;\\s*q=(?:0\\.|1))@', $ae)) {
+                return array('deflate', 'deflate');
+            }
+        }
+        if ($allowCompress && preg_match(
+                '@(?:^|,)\\s*((?:x-)?compress)\\s*(?:$|,|;\\s*q=(?:0\\.|1))@'
+                ,$ae
+                ,$m)) {
+            return array('compress', $m[1]);
+        }
+        return array('', '');
+    }
+
+    /**
+     * Encode (compress) the content
+     * 
+     * If the encode method is '' (none) or compression level is 0, or the 'zlib'
+     * extension isn't loaded, we return false.
+     * 
+     * Then the appropriate gz_* function is called to compress the content. If
+     * this fails, false is returned.
+     * 
+     * The header "Vary: Accept-Encoding" is added. If encoding is successful, 
+     * the Content-Length header is updated, and Content-Encoding is also added.

+     * 

+     * @param int $compressionLevel given to zlib functions. If not given, the
+     * class default will be used.
+     * 
+     * @return bool success true if the content was actually compressed
+     */
+    public function encode($compressionLevel = null)

+    {
+        $this->_headers['Vary'] = 'Accept-Encoding';
+        if (null === $compressionLevel) {
+            $compressionLevel = self::$compressionLevel;
+        }
+        if ('' === $this->_encodeMethod[0]
+            || ($compressionLevel == 0)
+            || !extension_loaded('zlib'))
+        {
+            return false;
+        }

+        if ($this->_encodeMethod[0] === 'deflate') {

+            $encoded = gzdeflate($this->_content, $compressionLevel);

+        } elseif ($this->_encodeMethod[0] === 'gzip') {
+            $encoded = gzencode($this->_content, $compressionLevel);
+        } else {
+            $encoded = gzcompress($this->_content, $compressionLevel);
+        }
+        if (false === $encoded) {
+            return false;
+        }
+        $this->_headers['Content-Length'] = strlen($encoded);
+        $this->_headers['Content-Encoding'] = $this->_encodeMethod[1];
+        $this->_content = $encoded;
+        return true;
+    }
+    
+    /**
+     * Encode and send appropriate headers and content
+     *
+     * This is a convenience method for common use of the class
+     * 
+     * @param string $content
+     * 

+     * @param int $compressionLevel given to zlib functions. If not given, the
+     * class default will be used.
+     * 
+     * @return bool success true if the content was actually compressed
+     */
+    public static function output($content, $compressionLevel = null)
+    {
+        if (null === $compressionLevel) {
+            $compressionLevel = self::$compressionLevel;
+        }
+        $he = new HTTP_Encoder(array('content' => $content));

+        $ret = $he->encode($compressionLevel);

+        $he->sendAll();
+        return $ret;
+    }

+    

+    protected $_content = '';
+    protected $_headers = array();
+    protected $_encodeMethod = array('', '');
+
+    /**
+     * Is the browser an IE version earlier than 6 SP2?  
+     */
+    protected static function _isBuggyIe()
+    {
+        $ua = $_SERVER['HTTP_USER_AGENT'];
+        // quick escape for non-IEs
+        if (0 !== strpos($ua, 'Mozilla/4.0 (compatible; MSIE ')
+            || false !== strpos($ua, 'Opera')) {
+            return false;
+        }
+        // no regex = faaast
+        $version = (float)substr($ua, 30); 
+        return self::$encodeToIe6
+            ? ($version < 6 || ($version == 6 && false === strpos($ua, 'SV1')))
+            : ($version < 7);
+    }
+}