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- 06.01.2017
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HeaderBag.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 * HeaderBag is a container for HTTP headers.
016 *
017 * @author Fabien Potencier <fabien@symfony.com>
018 */
019 class HeaderBag implements \IteratorAggregate, \Countable
020 {
021 protected $headers = array();
022 protected $cacheControl = array();
023
024 /**
025 * Constructor.
026 *
027 * @param array $headers An array of HTTP headers
028 */
029 public function __construct(array $headers = array())
030 {
031 foreach ($headers as $key => $values) {
032 $this->set($key, $values);
033 }
034 }
035
036 /**
037 * Returns the headers as a string.
038 *
039 * @return string The headers
040 */
041 public function __toString()
042 {
043 if (!$this->headers) {
044 return '';
045 }
046
047 $max = max(array_map('strlen', array_keys($this->headers))) + 1;
048 $content = '';
049 ksort($this->headers);
050 foreach ($this->headers as $name => $values) {
051 $name = implode('-', array_map('ucfirst', explode('-', $name)));
052 foreach ($values as $value) {
053 $content .= sprintf("%-{$max}s %s\r\n", $name.':', $value);
054 }
055 }
056
057 return $content;
058 }
059
060 /**
061 * Returns the headers.
062 *
063 * @return array An array of headers
064 */
065 public function all()
066 {
067 return $this->headers;
068 }
069
070 /**
071 * Returns the parameter keys.
072 *
073 * @return array An array of parameter keys
074 */
075 public function keys()
076 {
077 return array_keys($this->headers);
078 }
079
080 /**
081 * Replaces the current HTTP headers by a new set.
082 *
083 * @param array $headers An array of HTTP headers
084 */
085 public function replace(array $headers = array())
086 {
087 $this->headers = array();
088 $this->add($headers);
089 }
090
091 /**
092 * Adds new headers the current HTTP headers set.
093 *
094 * @param array $headers An array of HTTP headers
095 */
096 public function add(array $headers)
097 {
098 foreach ($headers as $key => $values) {
099 $this->set($key, $values);
100 }
101 }
102
103 /**
104 * Returns a header value by name.
105 *
106 * @param string $key The header name
107 * @param mixed $default The default value
108 * @param bool $first Whether to return the first value or all header values
109 *
110 * @return string|array The first header value if $first is true, an array of values otherwise
111 */
112 public function get($key, $default = null, $first = true)
113 {
114 $key = str_replace('_', '-', strtolower($key));
115
116 if (!array_key_exists($key, $this->headers)) {
117 if (null === $default) {
118 return $first ? null : array();
119 }
120
121 return $first ? $default : array($default);
122 }
123
124 if ($first) {
125 return count($this->headers[$key]) ? $this->headers[$key][0] : $default;
126 }
127
128 return $this->headers[$key];
129 }
130
131 /**
132 * Sets a header by name.
133 *
134 * @param string $key The key
135 * @param string|array $values The value or an array of values
136 * @param bool $replace Whether to replace the actual value or not (true by default)
137 */
138 public function set($key, $values, $replace = true)
139 {
140 $key = str_replace('_', '-', strtolower($key));
141
142 $values = array_values((array) $values);
143
144 if (true === $replace || !isset($this->headers[$key])) {
145 $this->headers[$key] = $values;
146 } else {
147 $this->headers[$key] = array_merge($this->headers[$key], $values);
148 }
149
150 if ('cache-control' === $key) {
151 $this->cacheControl = $this->parseCacheControl($values[0]);
152 }
153 }
154
155 /**
156 * Returns true if the HTTP header is defined.
157 *
158 * @param string $key The HTTP header
159 *
160 * @return bool true if the parameter exists, false otherwise
161 */
162 public function has($key)
163 {
164 return array_key_exists(str_replace('_', '-', strtolower($key)), $this->headers);
165 }
166
167 /**
168 * Returns true if the given HTTP header contains the given value.
169 *
170 * @param string $key The HTTP header name
171 * @param string $value The HTTP value
172 *
173 * @return bool true if the value is contained in the header, false otherwise
174 */
175 public function contains($key, $value)
176 {
177 return in_array($value, $this->get($key, null, false));
178 }
179
180 /**
181 * Removes a header.
182 *
183 * @param string $key The HTTP header name
184 */
185 public function remove($key)
186 {
187 $key = str_replace('_', '-', strtolower($key));
188
189 unset($this->headers[$key]);
190
191 if ('cache-control' === $key) {
192 $this->cacheControl = array();
193 }
194 }
195
196 /**
197 * Returns the HTTP header value converted to a date.
198 *
199 * @param string $key The parameter key
200 * @param \DateTime $default The default value
201 *
202 * @return null|\DateTime The parsed DateTime or the default value if the header does not exist
203 *
204 * @throws \RuntimeException When the HTTP header is not parseable
205 */
206 public function getDate($key, \DateTime $default = null)
207 {
208 if (null === $value = $this->get($key)) {
209 return $default;
210 }
211
212 if (false === $date = \DateTime::createFromFormat(DATE_RFC2822, $value)) {
213 throw new \RuntimeException(sprintf('The %s HTTP header is not parseable (%s).', $key, $value));
214 }
215
216 return $date;
217 }
218
219 /**
220 * Adds a custom Cache-Control directive.
221 *
222 * @param string $key The Cache-Control directive name
223 * @param mixed $value The Cache-Control directive value
224 */
225 public function addCacheControlDirective($key, $value = true)
226 {
227 $this->cacheControl[$key] = $value;
228
229 $this->set('Cache-Control', $this->getCacheControlHeader());
230 }
231
232 /**
233 * Returns true if the Cache-Control directive is defined.
234 *
235 * @param string $key The Cache-Control directive
236 *
237 * @return bool true if the directive exists, false otherwise
238 */
239 public function hasCacheControlDirective($key)
240 {
241 return array_key_exists($key, $this->cacheControl);
242 }
243
244 /**
245 * Returns a Cache-Control directive value by name.
246 *
247 * @param string $key The directive name
248 *
249 * @return mixed|null The directive value if defined, null otherwise
250 */
251 public function getCacheControlDirective($key)
252 {
253 return array_key_exists($key, $this->cacheControl) ? $this->cacheControl[$key] : null;
254 }
255
256 /**
257 * Removes a Cache-Control directive.
258 *
259 * @param string $key The Cache-Control directive
260 */
261 public function removeCacheControlDirective($key)
262 {
263 unset($this->cacheControl[$key]);
264
265 $this->set('Cache-Control', $this->getCacheControlHeader());
266 }
267
268 /**
269 * Returns an iterator for headers.
270 *
271 * @return \ArrayIterator An \ArrayIterator instance
272 */
273 public function getIterator()
274 {
275 return new \ArrayIterator($this->headers);
276 }
277
278 /**
279 * Returns the number of headers.
280 *
281 * @return int The number of headers
282 */
283 public function count()
284 {
285 return count($this->headers);
286 }
287
288 protected function getCacheControlHeader()
289 {
290 $parts = array();
291 ksort($this->cacheControl);
292 foreach ($this->cacheControl as $key => $value) {
293 if (true === $value) {
294 $parts[] = $key;
295 } else {
296 if (preg_match('#[^a-zA-Z0-9._-]#', $value)) {
297 $value = '"'.$value.'"';
298 }
299
300 $parts[] = "$key=$value";
301 }
302 }
303
304 return implode(', ', $parts);
305 }
306
307 /**
308 * Parses a Cache-Control HTTP header.
309 *
310 * @param string $header The value of the Cache-Control HTTP header
311 *
312 * @return array An array representing the attribute values
313 */
314 protected function parseCacheControl($header)
315 {
316 $cacheControl = array();
317 preg_match_all('#([a-zA-Z][a-zA-Z_-]*)\s*(?:=(?:"([^"]*)"|([^ \t",;]*)))?#', $header, $matches, PREG_SET_ORDER);
318 foreach ($matches as $match) {
319 $cacheControl[strtolower($match[1])] = isset($match[3]) ? $match[3] : (isset($match[2]) ? $match[2] : true);
320 }
321
322 return $cacheControl;
323 }
324 }
325