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ResponseHeaderBag.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpFoundation;
013
014 /**
015 * ResponseHeaderBag is a container for Response HTTP headers.
016 *
017 * @author Fabien Potencier <fabien@symfony.com>
018 */
019 class ResponseHeaderBag extends HeaderBag
020 {
021 const COOKIES_FLAT = 'flat';
022 const COOKIES_ARRAY = 'array';
023
024 const DISPOSITION_ATTACHMENT = 'attachment';
025 const DISPOSITION_INLINE = 'inline';
026
027 /**
028 * @var array
029 */
030 protected $computedCacheControl = array();
031
032 /**
033 * @var array
034 */
035 protected $cookies = array();
036
037 /**
038 * @var array
039 */
040 protected $headerNames = array();
041
042 /**
043 * Constructor.
044 *
045 * @param array $headers An array of HTTP headers
046 */
047 public function __construct(array $headers = array())
048 {
049 parent::__construct($headers);
050
051 if (!isset($this->headers['cache-control'])) {
052 $this->set('Cache-Control', '');
053 }
054 }
055
056 /**
057 * {@inheritdoc}
058 */
059 public function __toString()
060 {
061 $cookies = '';
062 foreach ($this->getCookies() as $cookie) {
063 $cookies .= 'Set-Cookie: '.$cookie."\r\n";
064 }
065
066 ksort($this->headerNames);
067
068 return parent::__toString().$cookies;
069 }
070
071 /**
072 * Returns the headers, with original capitalizations.
073 *
074 * @return array An array of headers
075 */
076 public function allPreserveCase()
077 {
078 return array_combine($this->headerNames, $this->headers);
079 }
080
081 /**
082 * {@inheritdoc}
083 */
084 public function replace(array $headers = array())
085 {
086 $this->headerNames = array();
087
088 parent::replace($headers);
089
090 if (!isset($this->headers['cache-control'])) {
091 $this->set('Cache-Control', '');
092 }
093 }
094
095 /**
096 * {@inheritdoc}
097 */
098 public function set($key, $values, $replace = true)
099 {
100 parent::set($key, $values, $replace);
101
102 $uniqueKey = str_replace('_', '-', strtolower($key));
103 $this->headerNames[$uniqueKey] = $key;
104
105 // ensure the cache-control header has sensible defaults
106 if (in_array($uniqueKey, array('cache-control', 'etag', 'last-modified', 'expires'))) {
107 $computed = $this->computeCacheControlValue();
108 $this->headers['cache-control'] = array($computed);
109 $this->headerNames['cache-control'] = 'Cache-Control';
110 $this->computedCacheControl = $this->parseCacheControl($computed);
111 }
112 }
113
114 /**
115 * {@inheritdoc}
116 */
117 public function remove($key)
118 {
119 parent::remove($key);
120
121 $uniqueKey = str_replace('_', '-', strtolower($key));
122 unset($this->headerNames[$uniqueKey]);
123
124 if ('cache-control' === $uniqueKey) {
125 $this->computedCacheControl = array();
126 }
127 }
128
129 /**
130 * {@inheritdoc}
131 */
132 public function hasCacheControlDirective($key)
133 {
134 return array_key_exists($key, $this->computedCacheControl);
135 }
136
137 /**
138 * {@inheritdoc}
139 */
140 public function getCacheControlDirective($key)
141 {
142 return array_key_exists($key, $this->computedCacheControl) ? $this->computedCacheControl[$key] : null;
143 }
144
145 /**
146 * Sets a cookie.
147 *
148 * @param Cookie $cookie
149 */
150 public function setCookie(Cookie $cookie)
151 {
152 $this->cookies[$cookie->getDomain()][$cookie->getPath()][$cookie->getName()] = $cookie;
153 }
154
155 /**
156 * Removes a cookie from the array, but does not unset it in the browser.
157 *
158 * @param string $name
159 * @param string $path
160 * @param string $domain
161 */
162 public function removeCookie($name, $path = '/', $domain = null)
163 {
164 if (null === $path) {
165 $path = '/';
166 }
167
168 unset($this->cookies[$domain][$path][$name]);
169
170 if (empty($this->cookies[$domain][$path])) {
171 unset($this->cookies[$domain][$path]);
172
173 if (empty($this->cookies[$domain])) {
174 unset($this->cookies[$domain]);
175 }
176 }
177 }
178
179 /**
180 * Returns an array with all cookies.
181 *
182 * @param string $format
183 *
184 * @return array
185 *
186 * @throws \InvalidArgumentException When the $format is invalid
187 */
188 public function getCookies($format = self::COOKIES_FLAT)
189 {
190 if (!in_array($format, array(self::COOKIES_FLAT, self::COOKIES_ARRAY))) {
191 throw new \InvalidArgumentException(sprintf('Format "%s" invalid (%s).', $format, implode(', ', array(self::COOKIES_FLAT, self::COOKIES_ARRAY))));
192 }
193
194 if (self::COOKIES_ARRAY === $format) {
195 return $this->cookies;
196 }
197
198 $flattenedCookies = array();
199 foreach ($this->cookies as $path) {
200 foreach ($path as $cookies) {
201 foreach ($cookies as $cookie) {
202 $flattenedCookies[] = $cookie;
203 }
204 }
205 }
206
207 return $flattenedCookies;
208 }
209
210 /**
211 * Clears a cookie in the browser.
212 *
213 * @param string $name
214 * @param string $path
215 * @param string $domain
216 * @param bool $secure
217 * @param bool $httpOnly
218 */
219 public function clearCookie($name, $path = '/', $domain = null, $secure = false, $httpOnly = true)
220 {
221 $this->setCookie(new Cookie($name, null, 1, $path, $domain, $secure, $httpOnly));
222 }
223
224 /**
225 * Generates a HTTP Content-Disposition field-value.
226 *
227 * @param string $disposition One of "inline" or "attachment"
228 * @param string $filename A unicode string
229 * @param string $filenameFallback A string containing only ASCII characters that
230 * is semantically equivalent to $filename. If the filename is already ASCII,
231 * it can be omitted, or just copied from $filename
232 *
233 * @return string A string suitable for use as a Content-Disposition field-value
234 *
235 * @throws \InvalidArgumentException
236 *
237 * @see RFC 6266
238 */
239 public function makeDisposition($disposition, $filename, $filenameFallback = '')
240 {
241 if (!in_array($disposition, array(self::DISPOSITION_ATTACHMENT, self::DISPOSITION_INLINE))) {
242 throw new \InvalidArgumentException(sprintf('The disposition must be either "%s" or "%s".', self::DISPOSITION_ATTACHMENT, self::DISPOSITION_INLINE));
243 }
244
245 if ('' == $filenameFallback) {
246 $filenameFallback = $filename;
247 }
248
249 // filenameFallback is not ASCII.
250 if (!preg_match('/^[\x20-\x7e]*$/', $filenameFallback)) {
251 throw new \InvalidArgumentException('The filename fallback must only contain ASCII characters.');
252 }
253
254 // percent characters aren't safe in fallback.
255 if (false !== strpos($filenameFallback, '%')) {
256 throw new \InvalidArgumentException('The filename fallback cannot contain the "%" character.');
257 }
258
259 // path separators aren't allowed in either.
260 if (false !== strpos($filename, '/') || false !== strpos($filename, '\\') || false !== strpos($filenameFallback, '/') || false !== strpos($filenameFallback, '\\')) {
261 throw new \InvalidArgumentException('The filename and the fallback cannot contain the "/" and "\\" characters.');
262 }
263
264 $output = sprintf('%s; filename="%s"', $disposition, str_replace('"', '\\"', $filenameFallback));
265
266 if ($filename !== $filenameFallback) {
267 $output .= sprintf("; filename*=utf-8''%s", rawurlencode($filename));
268 }
269
270 return $output;
271 }
272
273 /**
274 * Returns the calculated value of the cache-control header.
275 *
276 * This considers several other headers and calculates or modifies the
277 * cache-control header to a sensible, conservative value.
278 *
279 * @return string
280 */
281 protected function computeCacheControlValue()
282 {
283 if (!$this->cacheControl && !$this->has('ETag') && !$this->has('Last-Modified') && !$this->has('Expires')) {
284 return 'no-cache';
285 }
286
287 if (!$this->cacheControl) {
288 // conservative by default
289 return 'private, must-revalidate';
290 }
291
292 $header = $this->getCacheControlHeader();
293 if (isset($this->cacheControl['public']) || isset($this->cacheControl['private'])) {
294 return $header;
295 }
296
297 // public if s-maxage is defined, private otherwise
298 if (!isset($this->cacheControl['s-maxage'])) {
299 return $header.', private';
300 }
301
302 return $header;
303 }
304 }
305