/
Response.php
1541 lines (1449 loc) · 44.1 KB
/
Response.php
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<?php
/**
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since 2.0.0
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Network;
use Cake\Core\Configure;
use Cake\Network\Exception\NotFoundException;
use Cake\Filesystem\File;
use InvalidArgumentException;
use RuntimeException;
/**
* Cake Response 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.
*
*/
class Response {
/**
* 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',
505 => 'Unsupported Version'
);
/**
* Holds type key to mime type mappings for known mime types.
*
* @var array
*/
protected $_mimeTypes = array(
'html' => array('text/html', '*/*'),
'json' => 'application/json',
'xml' => array('application/xml', 'text/xml'),
'rss' => 'application/rss+xml',
'ai' => 'application/postscript',
'bcpio' => 'application/x-bcpio',
'bin' => 'application/octet-stream',
'ccad' => 'application/clariscad',
'cdf' => 'application/x-netcdf',
'class' => 'application/octet-stream',
'cpio' => 'application/x-cpio',
'cpt' => 'application/mac-compactpro',
'csh' => 'application/x-csh',
'csv' => array('text/csv', 'application/vnd.ms-excel'),
'dcr' => 'application/x-director',
'dir' => 'application/x-director',
'dms' => 'application/octet-stream',
'doc' => 'application/msword',
'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'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',
'exe' => 'application/octet-stream',
'ez' => 'application/andrew-inset',
'flv' => 'video/x-flv',
'gtar' => 'application/x-gtar',
'gz' => 'application/x-gzip',
'bz2' => 'application/x-bzip',
'7z' => 'application/x-7z-compressed',
'hdf' => 'application/x-hdf',
'hqx' => 'application/mac-binhex40',
'ico' => 'image/x-icon',
'ips' => 'application/x-ipscript',
'ipx' => 'application/x-ipix',
'js' => 'application/javascript',
'latex' => 'application/x-latex',
'lha' => 'application/octet-stream',
'lsp' => 'application/x-lisp',
'lzh' => 'application/octet-stream',
'man' => 'application/x-troff-man',
'me' => 'application/x-troff-me',
'mif' => 'application/vnd.mif',
'ms' => 'application/x-troff-ms',
'nc' => 'application/x-netcdf',
'oda' => 'application/oda',
'otf' => 'font/otf',
'pdf' => 'application/pdf',
'pgn' => 'application/x-chess-pgn',
'pot' => 'application/vnd.ms-powerpoint',
'pps' => 'application/vnd.ms-powerpoint',
'ppt' => 'application/vnd.ms-powerpoint',
'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
'ppz' => 'application/vnd.ms-powerpoint',
'pre' => 'application/x-freelance',
'prt' => 'application/pro_eng',
'ps' => 'application/postscript',
'roff' => 'application/x-troff',
'scm' => 'application/x-lotusscreencam',
'set' => 'application/set',
'sh' => 'application/x-sh',
'shar' => 'application/x-shar',
'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',
'sol' => 'application/solids',
'spl' => 'application/x-futuresplash',
'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',
'tr' => 'application/x-troff',
'tsp' => 'application/dsptype',
'ttc' => 'font/ttf',
'ttf' => 'font/ttf',
'unv' => 'application/i-deas',
'ustar' => 'application/x-ustar',
'vcd' => 'application/x-cdlink',
'vda' => 'application/vda',
'xlc' => 'application/vnd.ms-excel',
'xll' => 'application/vnd.ms-excel',
'xlm' => 'application/vnd.ms-excel',
'xls' => 'application/vnd.ms-excel',
'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'xlw' => 'application/vnd.ms-excel',
'zip' => 'application/zip',
'aif' => 'audio/x-aiff',
'aifc' => 'audio/x-aiff',
'aiff' => 'audio/x-aiff',
'au' => 'audio/basic',
'kar' => 'audio/midi',
'mid' => 'audio/midi',
'midi' => 'audio/midi',
'mp2' => 'audio/mpeg',
'mp3' => 'audio/mpeg',
'mpga' => 'audio/mpeg',
'ogg' => 'audio/ogg',
'oga' => 'audio/ogg',
'spx' => 'audio/ogg',
'ra' => 'audio/x-realaudio',
'ram' => 'audio/x-pn-realaudio',
'rm' => 'audio/x-pn-realaudio',
'rpm' => 'audio/x-pn-realaudio-plugin',
'snd' => 'audio/basic',
'tsi' => 'audio/TSP-audio',
'wav' => 'audio/x-wav',
'aac' => 'audio/aac',
'asc' => 'text/plain',
'c' => 'text/plain',
'cc' => 'text/plain',
'css' => 'text/css',
'etx' => 'text/x-setext',
'f' => 'text/plain',
'f90' => 'text/plain',
'h' => 'text/plain',
'hh' => 'text/plain',
'htm' => array('text/html', '*/*'),
'ics' => 'text/calendar',
'm' => 'text/plain',
'rtf' => 'text/rtf',
'rtx' => 'text/richtext',
'sgm' => 'text/sgml',
'sgml' => 'text/sgml',
'tsv' => 'text/tab-separated-values',
'tpl' => 'text/template',
'txt' => 'text/plain',
'text' => 'text/plain',
'avi' => 'video/x-msvideo',
'fli' => 'video/x-fli',
'mov' => 'video/quicktime',
'movie' => 'video/x-sgi-movie',
'mpe' => 'video/mpeg',
'mpeg' => 'video/mpeg',
'mpg' => 'video/mpeg',
'qt' => 'video/quicktime',
'viv' => 'video/vnd.vivo',
'vivo' => 'video/vnd.vivo',
'ogv' => 'video/ogg',
'webm' => 'video/webm',
'mp4' => 'video/mp4',
'm4v' => 'video/mp4',
'f4v' => 'video/mp4',
'f4p' => 'video/mp4',
'm4a' => 'audio/mp4',
'f4a' => 'audio/mp4',
'f4b' => 'audio/mp4',
'gif' => 'image/gif',
'ief' => 'image/ief',
'jpg' => 'image/jpeg',
'jpeg' => 'image/jpeg',
'jpe' => 'image/jpeg',
'pbm' => 'image/x-portable-bitmap',
'pgm' => 'image/x-portable-graymap',
'png' => 'image/png',
'pnm' => 'image/x-portable-anymap',
'ppm' => 'image/x-portable-pixmap',
'ras' => 'image/cmu-raster',
'rgb' => 'image/x-rgb',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'xbm' => 'image/x-xbitmap',
'xpm' => 'image/x-xpixmap',
'xwd' => 'image/x-xwindowdump',
'ice' => 'x-conference/x-cooltalk',
'iges' => 'model/iges',
'igs' => 'model/iges',
'mesh' => 'model/mesh',
'msh' => 'model/mesh',
'silo' => 'model/mesh',
'vrml' => 'model/vrml',
'wrl' => 'model/vrml',
'mime' => 'www/mime',
'pdb' => 'chemical/x-pdb',
'xyz' => 'chemical/x-pdb',
'javascript' => 'application/javascript',
'form' => 'application/x-www-form-urlencoded',
'file' => 'multipart/form-data',
'xhtml' => array('application/xhtml+xml', 'application/xhtml', 'text/xhtml'),
'xhtml-mobile' => 'application/vnd.wap.xhtml+xml',
'atom' => 'application/atom+xml',
'amf' => 'application/x-amf',
'wap' => array('text/vnd.wap.wml', 'text/vnd.wap.wmlscript', 'image/vnd.wap.wbmp'),
'wml' => 'text/vnd.wap.wml',
'wmlscript' => 'text/vnd.wap.wmlscript',
'wbmp' => 'image/vnd.wap.wbmp',
'woff' => 'application/x-font-woff',
'webp' => 'image/webp',
'appcache' => 'text/cache-manifest',
'manifest' => 'text/cache-manifest',
'htc' => 'text/x-component',
'rdf' => 'application/xml',
'crx' => 'application/x-chrome-extension',
'oex' => 'application/x-opera-extension',
'xpi' => 'application/x-xpinstall',
'safariextz' => 'application/octet-stream',
'webapp' => 'application/x-web-app-manifest+json',
'vcf' => 'text/x-vcard',
'vtt' => 'text/vtt',
'mkv' => 'video/x-matroska',
'pkpass' => 'application/vnd.apple.pkpass',
'ajax' => 'text/html'
);
/**
* Protocol header to send to the client
*
* @var string
*/
protected $_protocol = 'HTTP/1.1';
/**
* Status code to send to the client
*
* @var int
*/
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 int
*/
protected $_contentType = 'text/html';
/**
* Buffer list of headers
*
* @var array
*/
protected $_headers = array();
/**
* Buffer string for response message
*
* @var string
*/
protected $_body = null;
/**
* File object for file to be read out as response
*
* @var File
*/
protected $_file = null;
/**
* File range. Used for requesting ranges of files.
*
* @var array
*/
protected $_fileRange = [];
/**
* 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();
/**
* 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
* - statusCodes: additional allowable response codes
* - 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['statusCodes'])) {
$this->httpCodes($options['statusCodes']);
}
if (isset($options['status'])) {
$this->statusCode($options['status']);
}
if (isset($options['type'])) {
$this->type($options['type']);
}
if (!isset($options['charset'])) {
$options['charset'] = Configure::read('App.encoding');
}
$this->charset($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);
}
$this->_setContent();
$this->_setContentLength();
$this->sendHeaders();
if ($this->_file) {
$this->_sendFile($this->_file, $this->_fileRange);
$this->_file = $this->_fileRange = null;
} else {
$this->_sendContent($this->_body);
}
if (function_exists('fastcgi_finish_request')) {
fastcgi_finish_request();
}
}
/**
* Sends the HTTP headers and cookies.
*
* @return void
*/
public function sendHeaders() {
if (headers_sent()) {
return;
}
$this->_setCookies();
$codeMessage = $this->_statusCodes[$this->_status];
$this->_sendHeader("{$this->_protocol} {$this->_status} {$codeMessage}");
$this->_setContentType();
foreach ($this->_headers as $header => $values) {
foreach ((array)$values as $value) {
$this->_sendHeader($header, $value);
}
}
}
/**
* Sets the cookies that have been added via Cake\Network\Response::cookie() before any
* other output is sent to the client. Will set the cookies in the order they
* have been set.
*
* @return void
*/
protected function _setCookies() {
foreach ($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;
}
$whitelist = array(
'application/javascript', 'application/json', 'application/xml', 'application/rss+xml'
);
$charset = false;
if (
$this->_charset &&
(strpos($this->_contentType, 'text/') === 0 || in_array($this->_contentType, $whitelist))
) {
$charset = true;
}
if ($charset) {
$this->header('Content-Type', "{$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) {
$this->length($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, $value = null) {
if ($value === null) {
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|array $value The header value(s)
* @return array list of headers to be sent
*/
public function header($header = null, $value = null) {
if ($header === null) {
return $this->_headers;
}
$headers = is_array($header) ? $header : array($header => $value);
foreach ($headers as $header => $value) {
if (is_numeric($header)) {
list($header, $value) = array($value, null);
}
if ($value === null) {
list($header, $value) = explode(':', $header, 2);
}
$this->_headers[$header] = is_array($value) ? array_map('trim', $value) : trim($value);
}
return $this->_headers;
}
/**
* Accessor for the location header.
*
* Get/Set the Location header value.
*
* @param null|string $url Either null to get the current location, or a string to set one.
* @return string|null When setting the location null will be returned. When reading the location
* a string of the current location header value (if any) will be returned.
*/
public function location($url = null) {
if ($url === null) {
$headers = $this->header();
return isset($headers['Location']) ? $headers['Location'] : null;
}
$this->header('Location', $url);
return null;
}
/**
* 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 ($content === null) {
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 int $code the HTTP status code
* @return int current status code
* @throws \InvalidArgumentException When an unknown status code is reached.
*/
public function statusCode($code = null) {
if ($code === null) {
return $this->_status;
}
if (!isset($this->_statusCodes[$code])) {
throw new InvalidArgumentException('Unknown status code');
}
return $this->_status = $code;
}
/**
* Queries & sets valid HTTP response codes & messages.
*
* @param int|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
* keys are used as codes and the values as messages to add to the default HTTP
* codes. The codes must be integers greater than 99 and less than 1000. Keep in
* mind that the HTTP specification outlines that status codes begin with a digit
* between 1 and 5, which defines the class of response the client is to expect.
* Example:
*
* httpCodes(404); // returns array(404 => 'Not Found')
*
* httpCodes(array(
* 381 => 'Unicorn Moved',
* 555 => 'Unexpected Minotaur'
* )); // sets these new values, and returns true
*
* httpCodes(array(
* 0 => 'Nothing Here',
* -1 => 'Reverse Infinity',
* 12345 => 'Universal Password',
* 'Hello' => 'World'
* )); // throws an exception due to invalid codes
*
* For more on HTTP status codes see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec6.html#sec6.1
*
* @return mixed associative array of the HTTP codes as keys, and the message
* strings as values, or null of the given $code does not exist.
* @throws \InvalidArgumentException If an attempt is made to add an invalid status code
*/
public function httpCodes($code = null) {
if (empty($code)) {
return $this->_statusCodes;
}
if (is_array($code)) {
$codes = array_keys($code);
$min = min($codes);
if (!is_int($min) || $min < 100 || max($codes) > 999) {
throw new InvalidArgumentException('Invalid status 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 $contentType Content type key.
* @return mixed current content type or false if supplied an invalid content type
*/
public function type($contentType = null) {
if ($contentType === null) {
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 => $types) {
if (in_array($ctype, (array)$types)) {
return $alias;
}
}
return null;
}
/**
* Sets the response charset
* if $charset is null the current charset is returned
*
* @param string $charset Character set string.
* @return string current charset
*/
public function charset($charset = null) {
if ($charset === null) {
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, $time = '+1 day') {
if (!is_int($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 bool $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 int $time time in seconds after which the response should no longer be considered fresh
* @return bool
*/
public function sharable($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']);
} else {
$this->_cacheDirectives['private'] = true;
unset($this->_cacheDirectives['public']);
}
$this->maxAge($time);
if (!$time) {
$this->_setCacheControl();
}
return (bool)$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 int $seconds if null, the method will return the current s-maxage value
* @return int
*/
public function sharedMaxAge($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 int $seconds if null, the method will return the current max-age value
* @return int
*/
public function maxAge($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 circumstance without first revalidating
* with the origin.
* If called with no parameters, this function will return whether must-revalidate is present.
*
* @param bool $enable if null, the method will return the current
* must-revalidate value. If boolean sets or unsets the directive.
* @return bool
*/
public function mustRevalidate($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 $time Valid time string or \DateTime instance.
* @return string
*/
public function expires($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 $this->_headers['Expires'];
}
return null;
}
/**
* Sets the Last-Modified header for the response by taking a modification time
* If called with no parameters it will return the current Last-Modified value
*
* ## Examples:
*
* `$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 $time Valid time string or \DateTime instance.
* @return string
*/
public function modified($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