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<?php
/**
* CakeResponse
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Network
* @since CakePHP(tm) v 2.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

/**
* CakeResponse is responsible for managing the response text, status and headers of a HTTP response.
*
* By default controllers will use this class to render their response. If you are going to use
* a custom response class it should subclass this object in order to ensure compatibility.
*
* @package Cake.Network
*/
class CakeResponse {

/**
* Holds HTTP response statuses
*
* @var array
*/
protected $_statusCodes = array(
100 => 'Continue',
101 => 'Switching Protocols',
200 => 'OK',
201 => 'Created',
202 => 'Accepted',
203 => 'Non-Authoritative Information',
204 => 'No Content',
205 => 'Reset Content',
206 => 'Partial Content',
300 => 'Multiple Choices',
301 => 'Moved Permanently',
302 => 'Found',
303 => 'See Other',
304 => 'Not Modified',
305 => 'Use Proxy',
307 => 'Temporary Redirect',
400 => 'Bad Request',
401 => 'Unauthorized',
402 => 'Payment Required',
403 => 'Forbidden',
404 => 'Not Found',
405 => 'Method Not Allowed',
406 => 'Not Acceptable',
407 => 'Proxy Authentication Required',
408 => 'Request Time-out',
409 => 'Conflict',
410 => 'Gone',
411 => 'Length Required',
412 => 'Precondition Failed',
413 => 'Request Entity Too Large',
414 => 'Request-URI Too Large',
415 => 'Unsupported Media Type',
416 => 'Requested range not satisfiable',
417 => 'Expectation Failed',
500 => 'Internal Server Error',
501 => 'Not Implemented',
502 => 'Bad Gateway',
503 => 'Service Unavailable',
504 => 'Gateway Time-out'
);

/**
* Holds known mime type mappings
*
* @var array
*/
protected $_mimeTypes = array(
'html' => array('text/html', '*/*'),
'7z' => 'application/x-7z-compressed',
'aac' => 'audio/aac',
'ai' => 'application/postscript',
'aif' => 'audio/x-aiff',
'aifc' => 'audio/x-aiff',
'aiff' => 'audio/x-aiff',
'amf' => 'application/x-amf',
'appcache' => 'text/cache-manifest',
'asc' => 'text/plain',
'atom' => 'application/atom+xml',
'au' => 'audio/basic',
'avi' => 'video/x-msvideo',
'bcpio' => 'application/x-bcpio',
'bin' => 'application/octet-stream',
'bz2' => 'application/x-bzip',
'c' => 'text/plain',
'cc' => 'text/plain',
'ccad' => 'application/clariscad',
'cdf' => 'application/x-netcdf',
'class' => 'application/octet-stream',
'cpio' => 'application/x-cpio',
'cpt' => 'application/mac-compactpro',
'crx' => 'application/x-chrome-extension',
'csh' => 'application/x-csh',
'css' => 'text/css',
'csv' => array('text/csv', 'application/vnd.ms-excel', 'text/plain'),
'dcr' => 'application/x-director',
'dir' => 'application/x-director',
'dms' => 'application/octet-stream',
'doc' => 'application/msword',
'drw' => 'application/drafting',
'dvi' => 'application/x-dvi',
'dwg' => 'application/acad',
'dxf' => 'application/dxf',
'dxr' => 'application/x-director',
'eot' => 'application/vnd.ms-fontobject',
'eps' => 'application/postscript',
'etx' => 'text/x-setext',
'exe' => 'application/octet-stream',
'ez' => 'application/andrew-inset',
'f' => 'text/plain',
'f4a' => 'audio/mp4',
'f4b' => 'audio/mp4',
'f4p' => 'video/mp4',
'f4v' => 'video/mp4',
'f90' => 'text/plain',
'file' => 'multipart/form-data',
'fli' => 'video/x-fli',
'flv' => 'video/x-flv',
'form' => 'application/x-www-form-urlencoded',
'gif' => 'image/gif',
'gtar' => 'application/x-gtar',
'gz' => 'application/x-gzip',
'h' => 'text/plain',
'hdf' => 'application/x-hdf',
'hh' => 'text/plain',
'hqx' => 'application/mac-binhex40',
'htc' => 'text/x-component',
'htm' => array('text/html', '*/*'),
'ice' => 'x-conference/x-cooltalk',
'ico' => 'image/x-icon',
'ics' => 'text/calendar',
'ief' => 'image/ief',
'iges' => 'model/iges',
'igs' => 'model/iges',
'ips' => 'application/x-ipscript',
'ipx' => 'application/x-ipix',
'javascript' => 'application/javascript',
'jpe' => 'image/jpeg',
'jpeg' => 'image/jpeg',
'jpg' => 'image/jpeg',
'js' => 'application/javascript',
'json' => 'application/json',
'kar' => 'audio/midi',
'latex' => 'application/x-latex',
'lha' => 'application/octet-stream',
'lsp' => 'application/x-lisp',
'lzh' => 'application/octet-stream',
'm' => 'text/plain',
'm4a' => 'audio/mp4',
'm4v' => 'video/mp4',
'man' => 'application/x-troff-man',
'manifest' => 'text/cache-manifest',
'me' => 'application/x-troff-me',
'mesh' => 'model/mesh',
'mid' => 'audio/midi',
'midi' => 'audio/midi',
'mif' => 'application/vnd.mif',
'mime' => 'www/mime',
'mov' => 'video/quicktime',
'movie' => 'video/x-sgi-movie',
'mp2' => 'audio/mpeg',
'mp3' => 'audio/mpeg',
'mp4' => 'video/mp4',
'mpe' => 'video/mpeg',
'mpeg' => 'video/mpeg',
'mpg' => 'video/mpeg',
'mpga' => 'audio/mpeg',
'ms' => 'application/x-troff-ms',
'msh' => 'model/mesh',
'nc' => 'application/x-netcdf',
'oda' => 'application/oda',
'oex' => 'application/x-opera-extension',
'oga' => 'audio/ogg',
'ogg' => 'audio/ogg',
'ogv' => 'video/ogg',
'otf' => 'font/otf',
'pbm' => 'image/x-portable-bitmap',
'pdb' => 'chemical/x-pdb',
'pdf' => 'application/pdf',
'pgm' => 'image/x-portable-graymap',
'pgn' => 'application/x-chess-pgn',
'png' => 'image/png',
'pnm' => 'image/x-portable-anymap',
'pot' => 'application/mspowerpoint',
'ppm' => 'image/x-portable-pixmap',
'pps' => 'application/mspowerpoint',
'ppt' => 'application/mspowerpoint',
'ppz' => 'application/mspowerpoint',
'pre' => 'application/x-freelance',
'prt' => 'application/pro_eng',
'ps' => 'application/postscript',
'qt' => 'video/quicktime',
'ra' => 'audio/x-realaudio',
'ram' => 'audio/x-pn-realaudio',
'ras' => 'image/cmu-raster',
'rdf' => 'application/xml',
'rgb' => 'image/x-rgb',
'rm' => 'audio/x-pn-realaudio',
'roff' => 'application/x-troff',
'rpm' => 'audio/x-pn-realaudio-plugin',
'rss' => 'application/rss+xml',
'rtf' => 'text/rtf',
'rtx' => 'text/richtext',
'safariextz' => 'application/octet-stream',
'scm' => 'application/x-lotusscreencam',
'set' => 'application/set',
'sgm' => 'text/sgml',
'sgml' => 'text/sgml',
'sh' => 'application/x-sh',
'shar' => 'application/x-shar',
'silo' => 'model/mesh',
'sit' => 'application/x-stuffit',
'skd' => 'application/x-koan',
'skm' => 'application/x-koan',
'skp' => 'application/x-koan',
'skt' => 'application/x-koan',
'smi' => 'application/smil',
'smil' => 'application/smil',
'snd' => 'audio/basic',
'sol' => 'application/solids',
'spl' => 'application/x-futuresplash',
'spx' => 'audio/ogg',
'src' => 'application/x-wais-source',
'step' => 'application/STEP',
'stl' => 'application/SLA',
'stp' => 'application/STEP',
'sv4cpio' => 'application/x-sv4cpio',
'sv4crc' => 'application/x-sv4crc',
'svg' => 'image/svg+xml',
'svgz' => 'image/svg+xml',
'swf' => 'application/x-shockwave-flash',
't' => 'application/x-troff',
'tar' => 'application/x-tar',
'tcl' => 'application/x-tcl',
'tex' => 'application/x-tex',
'texi' => 'application/x-texinfo',
'texinfo' => 'application/x-texinfo',
'text' => 'text/plain',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'tpl' => 'text/template',
'tr' => 'application/x-troff',
'tsi' => 'audio/TSP-audio',
'tsp' => 'application/dsptype',
'tsv' => 'text/tab-separated-values',
'ttc' => 'font/ttf',
'ttf' => 'font/ttf',
'txt' => 'text/plain',
'unv' => 'application/i-deas',
'ustar' => 'application/x-ustar',
'vcd' => 'application/x-cdlink',
'vcf' => 'text/x-vcard',
'vda' => 'application/vda',
'viv' => 'video/vnd.vivo',
'vivo' => 'video/vnd.vivo',
'vrml' => 'model/vrml',
'vtt' => 'text/vtt',
'wap' => array('text/vnd.wap.wml', 'text/vnd.wap.wmlscript', 'image/vnd.wap.wbmp'),
'wav' => 'audio/x-wav',
'wbmp' => 'image/vnd.wap.wbmp',
'webapp' => 'application/x-web-app-manifest+json',
'webm' => 'video/webm',
'webp' => 'image/webp',
'wml' => 'text/vnd.wap.wml',
'wmlscript' => 'text/vnd.wap.wmlscript',
'woff' => 'application/x-font-woff',
'wrl' => 'model/vrml',
'xbm' => 'image/x-xbitmap',
'xhtml' => array('application/xhtml+xml', 'application/xhtml', 'text/xhtml'),
'xhtml-mobile' => 'application/vnd.wap.xhtml+xml',
'xlc' => 'application/vnd.ms-excel',
'xll' => 'application/vnd.ms-excel',
'xlm' => 'application/vnd.ms-excel',
'xls' => 'application/vnd.ms-excel',
'xlw' => 'application/vnd.ms-excel',
'xml' => array('application/xml', 'text/xml'),
'xpi' => 'application/x-xpinstall',
'xpm' => 'image/x-xpixmap',
'xwd' => 'image/x-xwindowdump',
'xyz' => 'chemical/x-pdb',
'zip' => 'application/zip',
);

/**
* Protocol header to send to the client
*
* @var string
*/
protected $_protocol = 'HTTP/1.1';

/**
* Status code to send to the client
*
* @var integer
*/
protected $_status = 200;

/**
* Content type to send. This can be an 'extension' that will be transformed using the $_mimetypes array
* or a complete mime-type
*
* @var integer
*/
protected $_contentType = 'text/html';

/**
* Buffer list of headers
*
* @var array
*/
protected $_headers = array();

/**
* Buffer string for response message
*
* @var string
*/
protected $_body = null;

/**
* The charset the response body is encoded with
*
* @var string
*/
protected $_charset = 'UTF-8';

/**
* Holds all the cache directives that will be converted
* into headers when sending the request
*
* @var string
*/
protected $_cacheDirectives = array();

/**
* Holds cookies to be sent to the client
*
* @var array
*/
protected $_cookies = array();

/**
* Class constructor
*
* @param array $options list of parameters to setup the response. Possible values are:
* - body: the response text that should be sent to the client
* - status: the HTTP status code to respond with
* - type: a complete mime-type string or an extension mapped in this class
* - charset: the charset for the response body
*/
public function __construct(array $options = array()) {
if (isset($options['body'])) {
$this->body($options['body']);
}
if (isset($options['status'])) {
$this->statusCode($options['status']);
}
if (isset($options['type'])) {
$this->type($options['type']);
}
if (isset($options['charset'])) {
$this->charset($options['charset']);
}
}

/**
* Sends the complete response to the client including headers and message body.
* Will echo out the content in the response body.
*
* @return void
*/
public function send() {
if (isset($this->_headers['Location']) && $this->_status === 200) {
$this->statusCode(302);
}

$codeMessage = $this->_statusCodes[$this->_status];
$this->_setCookies();
$this->_sendHeader("{$this->_protocol} {$this->_status} {$codeMessage}");
$this->_setContent();
$this->_setContentLength();
$this->_setContentType();
foreach ($this->_headers as $header => $value) {
$this->_sendHeader($header, $value);
}
$this->_sendContent($this->_body);
}

/**
* Sets the cookies that have been added via static method CakeResponse::addCookie()
* before any other output is sent to the client.
* Will set the cookies in the order they have been set.
*
* @return void
*/
protected function _setCookies() {
foreach ($this->_cookies as $name => $c) {
setcookie(
$name, $c['value'], $c['expire'], $c['path'],
$c['domain'], $c['secure'], $c['httpOnly']
);
}
}

/**
* Formats the Content-Type header based on the configured contentType and charset
* the charset will only be set in the header if the response is of type text/*
*
* @return void
*/
protected function _setContentType() {
if (in_array($this->_status, array(304, 204))) {
return;
}
if (strpos($this->_contentType, 'text/') === 0) {
$this->header('Content-Type', "{$this->_contentType}; charset={$this->_charset}");
} else {
$this->header('Content-Type', "{$this->_contentType}");
}
}

/**
* Sets the response body to an empty text if the status code is 204 or 304
*
* @return void
*/
protected function _setContent() {
if (in_array($this->_status, array(304, 204))) {
$this->body('');
}
}

/**
* Calculates the correct Content-Length and sets it as a header in the response
* Will not set the value if already set or if the output is compressed.
*
* @return void
*/
protected function _setContentLength() {
$shouldSetLength = !isset($this->_headers['Content-Length']) && !in_array($this->_status, range(301, 307));
if (isset($this->_headers['Content-Length']) && $this->_headers['Content-Length'] === false) {
unset($this->_headers['Content-Length']);
return;
}
if ($shouldSetLength && !$this->outputCompressed()) {
$offset = ob_get_level() ? ob_get_length() : 0;
if (ini_get('mbstring.func_overload') & 2 && function_exists('mb_strlen')) {
$this->length($offset + mb_strlen($this->_body, '8bit'));
} else {
$this->length($this->_headers['Content-Length'] = $offset + strlen($this->_body));
}
}
}

/**
* Sends a header to the client.
*
* @param string $name the header name
* @param string $value the header value
* @return void
*/
protected function _sendHeader($name, $value = null) {
if (!headers_sent()) {
if (is_null($value)) {
header($name);
} else {
header("{$name}: {$value}");
}
}
}

/**
* Sends a content string to the client.
*
* @param string $content string to send as response body
* @return void
*/
protected function _sendContent($content) {
echo $content;
}

/**
* Buffers a header string to be sent
* Returns the complete list of buffered headers
*
* ### Single header
* e.g `header('Location', 'http://example.com');`
*
* ### Multiple headers
* e.g `header(array('Location' => 'http://example.com', 'X-Extra' => 'My header'));`
*
* ### String header
* e.g `header('WWW-Authenticate: Negotiate');`
*
* ### Array of string headers
* e.g `header(array('WWW-Authenticate: Negotiate', 'Content-type: application/pdf'));`
*
* Multiple calls for setting the same header name will have the same effect as setting the header once
* with the last value sent for it
* e.g `header('WWW-Authenticate: Negotiate'); header('WWW-Authenticate: Not-Negotiate');`
* will have the same effect as only doing `header('WWW-Authenticate: Not-Negotiate');`
*
* @param string|array $header. An array of header strings or a single header string
* - an associative array of "header name" => "header value" is also accepted
* - an array of string headers is also accepted
* @param string $value. The header value.
* @return array list of headers to be sent
*/
public function header($header = null, $value = null) {
if (is_null($header)) {
return $this->_headers;
}
if (is_array($header)) {
foreach ($header as $h => $v) {
if (is_numeric($h)) {
$this->header($v);
continue;
}
$this->_headers[$h] = trim($v);
}
return $this->_headers;
}

if (!is_null($value)) {
$this->_headers[$header] = $value;
return $this->_headers;
}

list($header, $value) = explode(':', $header, 2);
$this->_headers[$header] = trim($value);
return $this->_headers;
}

/**
* Buffers the response message to be sent
* if $content is null the current buffer is returned
*
* @param string $content the string message to be sent
* @return string current message buffer if $content param is passed as null
*/
public function body($content = null) {
if (is_null($content)) {
return $this->_body;
}
return $this->_body = $content;
}

/**
* Sets the HTTP status code to be sent
* if $code is null the current code is returned
*
* @param integer $code
* @return integer current status code
* @throws CakeException When an unknown status code is reached.
*/
public function statusCode($code = null) {
if (is_null($code)) {
return $this->_status;
}
if (!isset($this->_statusCodes[$code])) {
throw new CakeException(__d('cake_dev', 'Unknown status code'));
}
return $this->_status = $code;
}

/**
* Queries & sets valid HTTP response codes & messages.
*
* @param integer|array $code If $code is an integer, then the corresponding code/message is
* returned if it exists, null if it does not exist. If $code is an array,
* then the 'code' and 'message' keys of each nested array are added to the default
* HTTP codes. Example:
*
* httpCodes(404); // returns array(404 => 'Not Found')
*
* httpCodes(array(
* 701 => 'Unicorn Moved',
* 800 => 'Unexpected Minotaur'
* )); // sets these new values, and returns true
*
* @return mixed associative array of the HTTP codes as keys, and the message
* strings as values, or null of the given $code does not exist.
*/
public function httpCodes($code = null) {
if (empty($code)) {
return $this->_statusCodes;
}

if (is_array($code)) {
$this->_statusCodes = $code + $this->_statusCodes;
return true;
}

if (!isset($this->_statusCodes[$code])) {
return null;
}
return array($code => $this->_statusCodes[$code]);
}

/**
* Sets the response content type. It can be either a file extension
* which will be mapped internally to a mime-type or a string representing a mime-type
* if $contentType is null the current content type is returned
* if $contentType is an associative array, content type definitions will be stored/replaced
*
* ### Setting the content type
*
* e.g `type('jpg');`
*
* ### Returning the current content type
*
* e.g `type();`
*
* ### Storing content type definitions
*
* e.g `type(array('keynote' => 'application/keynote', 'bat' => 'application/bat'));`
*
* ### Replacing a content type definition
*
* e.g `type(array('jpg' => 'text/plain'));`
*
* @param string $contentType
* @return mixed current content type or false if supplied an invalid content type
*/
public function type($contentType = null) {
if (is_null($contentType)) {
return $this->_contentType;
}
if (is_array($contentType)) {
foreach ($contentType as $type => $definition) {
$this->_mimeTypes[$type] = $definition;
}
return $this->_contentType;
}
if (isset($this->_mimeTypes[$contentType])) {
$contentType = $this->_mimeTypes[$contentType];
$contentType = is_array($contentType) ? current($contentType) : $contentType;
}
if (strpos($contentType, '/') === false) {
return false;
}
return $this->_contentType = $contentType;
}

/**
* Returns the mime type definition for an alias
*
* e.g `getMimeType('pdf'); // returns 'application/pdf'`
*
* @param string $alias the content type alias to map
* @return mixed string mapped mime type or false if $alias is not mapped
*/
public function getMimeType($alias) {
if (isset($this->_mimeTypes[$alias])) {
return $this->_mimeTypes[$alias];
}
return false;
}

/**
* Maps a content-type back to an alias
*
* e.g `mapType('application/pdf'); // returns 'pdf'`
*
* @param string|array $ctype Either a string content type to map, or an array of types.
* @return mixed Aliases for the types provided.
*/
public function mapType($ctype) {
if (is_array($ctype)) {
return array_map(array($this, 'mapType'), $ctype);
}

foreach ($this->_mimeTypes as $alias => $types) {
if (is_array($types) && in_array($ctype, $types)) {
return $alias;
} elseif (is_string($types) && $types == $ctype) {
return $alias;
}
}
return null;
}

/**
* Sets the response charset
* if $charset is null the current charset is returned
*
* @param string $charset
* @return string current charset
*/
public function charset($charset = null) {
if (is_null($charset)) {
return $this->_charset;
}
return $this->_charset = $charset;
}

/**
* Sets the correct headers to instruct the client to not cache the response
*
* @return void
*/
public function disableCache() {
$this->header(array(
'Expires' => 'Mon, 26 Jul 1997 05:00:00 GMT',
'Last-Modified' => gmdate("D, d M Y H:i:s") . " GMT",
'Cache-Control' => 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0'
));
}

/**
* Sets the correct headers to instruct the client to cache the response.
*
* @param string $since a valid time since the response text has not been modified
* @param string $time a valid time for cache expiry
* @return void
*/
public function cache($since, $time = '+1 day') {
if (!is_integer($time)) {
$time = strtotime($time);
}
$this->header(array(
'Date' => gmdate("D, j M Y G:i:s ", time()) . 'GMT'
));
$this->modified($since);
$this->expires($time);
$this->sharable(true);
$this->maxAge($time - time());
}

/**
* Sets whether a response is eligible to be cached by intermediate proxies
* This method controls the `public` or `private` directive in the Cache-Control
* header
*
* @param boolean $public if set to true, the Cache-Control header will be set as public
* if set to false, the response will be set to private
* if no value is provided, it will return whether the response is sharable or not
* @param integer $time time in seconds after which the response should no longer be considered fresh
* @return boolean
*/
public function sharable($public = null, $time = null) {
if ($public === null) {
$public = array_key_exists('public', $this->_cacheDirectives);
$private = array_key_exists('private', $this->_cacheDirectives);
$noCache = array_key_exists('no-cache', $this->_cacheDirectives);
if (!$public && !$private && !$noCache) {
return null;
}
$sharable = $public || ! ($private || $noCache);
return $sharable;
}
if ($public) {
$this->_cacheDirectives['public'] = true;
unset($this->_cacheDirectives['private']);
$this->sharedMaxAge($time);
} else {
$this->_cacheDirectives['private'] = true;
unset($this->_cacheDirectives['public']);
$this->maxAge($time);
}
if ($time == null) {
$this->_setCacheControl();
}
return (bool)$public;
}

/**
* Sets the Cache-Control s-maxage directive.
* The max-age is the number of seconds after which the response should no longer be considered
* a good candidate to be fetched from a shared cache (like in a proxy server).
* If called with no parameters, this function will return the current max-age value if any
*
* @param integer $seconds if null, the method will return the current s-maxage value
* @return int
*/
public function sharedMaxAge($seconds = null) {
if ($seconds !== null) {
$this->_cacheDirectives['s-maxage'] = $seconds;
$this->_setCacheControl();
}
if (isset($this->_cacheDirectives['s-maxage'])) {
return $this->_cacheDirectives['s-maxage'];
}
return null;
}

/**
* Sets the Cache-Control max-age directive.
* The max-age is the number of seconds after which the response should no longer be considered
* a good candidate to be fetched from the local (client) cache.
* If called with no parameters, this function will return the current max-age value if any
*
* @param integer $seconds if null, the method will return the current max-age value
* @return int
*/
public function maxAge($seconds = null) {
if ($seconds !== null) {
$this->_cacheDirectives['max-age'] = $seconds;
$this->_setCacheControl();
}
if (isset($this->_cacheDirectives['max-age'])) {
return $this->_cacheDirectives['max-age'];
}
return null;
}

/**
* Sets the Cache-Control must-revalidate directive.
* must-revalidate indicates that the response should not be served
* stale by a cache under any cirumstance without first revalidating
* with the origin.
* If called with no parameters, this function will return wheter must-revalidate is present.
*
* @param integer $seconds if null, the method will return the current
* must-revalidate value
* @return boolean
*/
public function mustRevalidate($enable = null) {
if ($enable !== null) {
if ($enable) {
$this->_cacheDirectives['must-revalidate'] = true;
} else {
unset($this->_cacheDirectives['must-revalidate']);
}
$this->_setCacheControl();
}
return array_key_exists('must-revalidate', $this->_cacheDirectives);
}

/**
* Helper method to generate a valid Cache-Control header from the options set
* in other methods
*
* @return void
*/
protected function _setCacheControl() {
$control = '';
foreach ($this->_cacheDirectives as $key => $val) {
$control .= $val === true ? $key : sprintf('%s=%s', $key, $val);
$control .= ', ';
}
$control = rtrim($control, ', ');
$this->header('Cache-Control', $control);
}

/**
* Sets the Expires header for the response by taking an expiration time
* If called with no parameters it will return the current Expires value
*
* ## Examples:
*
* `$response->expires('now')` Will Expire the response cache now
* `$response->expires(new DateTime('+1 day'))` Will set the expiration in next 24 hours
* `$response->expires()` Will return the current expiration header value
*
* @param string|DateTime $time
* @return string
*/
public function expires($time = null) {
if ($time !== null) {
$date = $this->_getUTCDate($time);
$this->_headers['Expires'] = $date->format('D, j M Y H:i:s') . ' GMT';
}
if (isset($this->_headers['Expires'])) {
return $this->_headers['Expires'];
}
return null;
}

/**
* Sets the Last-Modified header for the response by taking an modification time
* If called with no parameters it will return the current Last-Modified value
*
* ## Examples:
*
* `$response->modified('now')` Will set the Last-Modified to the current time
* `$response->modified(new DateTime('+1 day'))` Will set the modification date in the past 24 hours
* `$response->modified()` Will return the current Last-Modified header value
*
* @param string|DateTime $time
* @return string
*/
public function modified($time = null) {
if ($time !== null) {
$date = $this->_getUTCDate($time);
$this->_headers['Last-Modified'] = $date->format('D, j M Y H:i:s') . ' GMT';
}
if (isset($this->_headers['Last-Modified'])) {
return $this->_headers['Last-Modified'];
}
return null;
}

/**
* Sets the response as Not Modified by removing any body contents
* setting the status code to "304 Not Modified" and removing all
* conflicting headers
*
* @return void
**/
public function notModified() {
$this->statusCode(304);
$this->body('');
$remove = array(
'Allow',
'Content-Encoding',
'Content-Language',
'Content-Length',
'Content-MD5',
'Content-Type',
'Last-Modified'
);
foreach ($remove as $header) {
unset($this->_headers[$header]);
}
}

/**
* Sets the Vary header for the response, if an array is passed,
* values will be imploded into a comma separated string. If no
* parameters are passed, then an array with the current Vary header
* value is returned
*
* @param string|array $cacheVariances a single Vary string or a array
* containig the list for variances.
* @return array
**/
public function vary($cacheVariances = null) {
if ($cacheVariances !== null) {
$cacheVariances = (array)$cacheVariances;
$this->_headers['Vary'] = implode(', ', $cacheVariances);
}
if (isset($this->_headers['Vary'])) {
return explode(', ', $this->_headers['Vary']);
}
return null;
}

/**
* Sets the response Etag, Etags are a strong indicative that a response
* can be cached by a HTTP client. A bad way of generaing Etags is
* creating a hash of the response output, instead generate a unique
* hash of the unique components that identifies a request, such as a
* modification time, a resource Id, and anything else you consider it
* makes it unique.
*
* Second parameter is used to instuct clients that the content has
* changed, but sematicallly, it can be used as the same thing. Think
* for instance of a page with a hit counter, two different page views
* are equivalent, but they differ by a few bytes. This leaves off to
* the Client the decision of using or not the cached page.
*
* If no parameters are passed, current Etag header is returned.
*
* @param string $hash the unique has that identifies this resposnse
* @param boolean $weak whether the response is semantically the same as
* other with th same hash or not
* @return string
**/
public function etag($tag = null, $weak = false) {
if ($tag !== null) {
$this->_headers['Etag'] = sprintf('%s"%s"', ($weak) ? 'W/' : null, $tag);
}
if (isset($this->_headers['Etag'])) {
return $this->_headers['Etag'];
}
return null;
}

/**
* Returns a DateTime object initialized at the $time param and using UTC
* as timezone
*
* @param string|integer|DateTime $time
* @return DateTime
*/
protected function _getUTCDate($time = null) {
if ($time instanceof DateTime) {
$result = clone $time;
} elseif (is_integer($time)) {
$result = new DateTime(date('Y-m-d H:i:s', $time));
} else {
$result = new DateTime($time);
}
$result->setTimeZone(new DateTimeZone('UTC'));
return $result;
}

/**
* Sets the correct output buffering handler to send a compressed response. Responses will
* be compressed with zlib, if the extension is available.
*
* @return boolean false if client does not accept compressed responses or no handler is available, true otherwise
*/
public function compress() {
$compressionEnabled = ini_get("zlib.output_compression") !== '1' &&
extension_loaded("zlib") &&
(strpos(env('HTTP_ACCEPT_ENCODING'), 'gzip') !== false);
return $compressionEnabled && ob_start('ob_gzhandler');
}

/**
* Returns whether the resulting output will be compressed by PHP
*
* @return boolean
*/
public function outputCompressed() {
return strpos(env('HTTP_ACCEPT_ENCODING'), 'gzip') !== false
&& (ini_get("zlib.output_compression") === '1' || in_array('ob_gzhandler', ob_list_handlers()));
}

/**
* Sets the correct headers to instruct the browser to download the response as a file.
*
* @param string $filename the name of the file as the browser will download the response
* @return void
*/
public function download($filename) {
$this->header('Content-Disposition', 'attachment; filename="' . $filename . '"');
}

/**
* Sets the protocol to be used when sending the response. Defaults to HTTP/1.1
* If called with no arguments, it will return the current configured protocol
*
* @return string protocol to be used for sending response
*/
public function protocol($protocol = null) {
if ($protocol !== null) {
$this->_protocol = $protocol;
}
return $this->_protocol;
}

/**
* Sets the Content-Length header for the response
* If called with no arguments returns the last Content-Length set
*
* @return int
*/
public function length($bytes = null) {
if ($bytes !== null ) {
$this->_headers['Content-Length'] = $bytes;
}
if (isset($this->_headers['Content-Length'])) {
return $this->_headers['Content-Length'];
}
return null;
}

/**
* Checks whether a response has not been modified according to the 'If-None-Match'
* (Etags) and 'If-Modified-Since' (last modification date) request
* headers headers. If the response is detected to be not modified, it
* is marked as so accordingly so the client can be informed of that.
*
* In order to mark a response as not modified, you need to set at least
* the Last-Modified response header or a response etag to be compared
* with the request itself
*
* @return boolean whether the response was marked as not modified or
* not
**/
public function checkNotModified(CakeRequest $request) {
$etags = preg_split('/\s*,\s*/', $request->header('If-None-Match'), null, PREG_SPLIT_NO_EMPTY);
$modifiedSince = $request->header('If-Modified-Since');
if ($responseTag = $this->etag()) {
$etagMatches = in_array('*', $etags) || in_array($responseTag, $etags);
}
if ($modifiedSince) {
$timeMatches = strtotime($this->modified()) == strtotime($modifiedSince);
}
$checks = compact('etagMatches', 'timeMatches');
if (empty($checks)) {
return false;
}
$notModified = !in_array(false, $checks, true);
if ($notModified) {
$this->notModified();
}
return $notModified;
}

/**
* String conversion. Fetches the response body as a string.
* Does *not* send headers.
*
* @return string
*/
public function __toString() {
return (string)$this->_body;
}

/**
* Getter/Setter for cookie configs
*
* This method acts as a setter/getter depending on the type of the argument.
* If the method is called with no arguments, it returns all configurations.
*
* If the method is called with a string as argument, it returns either the
* given configuration if it is set, or null, if it's not set.
*
* If the method is called with an array as argument, it will set the cookie
* configuration to the cookie container.
*
* @param $options Either null to get all cookies, string for a specific cookie
* or array to set cookie.
*
* ### Options (when setting a configuration)
* - name: The Cookie name
* - value: Value of the cookie
* - expire: Time the cookie expires in
* - path: Path the cookie applies to
* - domain: Domain the cookie is for.
* - secure: Is the cookie https?
* - httpOnly: Is the cookie available in the client?
*
* ## Examples
*
* ### Getting all cookies
*
* `$this->cookie()`
*
* ### Getting a certain cookie configuration
*
* `$this->cookie('MyCookie')`
*
* ### Setting a cookie configuration
*
* `$this->cookie((array) $options)`
*
* @return mixed
*/
public function cookie($options = null) {
if ($options === null) {
return $this->_cookies;
}

if (is_string($options)) {
if (!isset($this->_cookies[$options])) {
return null;
}
return $this->_cookies[$options];
}

$defaults = array(
'name' => 'CakeCookie[default]',
'value' => '',
'expire' => 0,
'path' => '/',
'domain' => '',
'secure' => false,
'httpOnly' => false
);
$options += $defaults;

$this->_cookies[$options['name']] = $options;
}

}
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