|
| 1 | +<?php |
| 2 | + |
| 3 | +namespace Symfony\Components\RequestHandler; |
| 4 | + |
| 5 | +/* |
| 6 | + * This file is part of the Symfony framework. |
| 7 | + * |
| 8 | + * (c) Fabien Potencier <fabien.potencier@symfony-project.com> |
| 9 | + * |
| 10 | + * This source file is subject to the MIT license that is bundled |
| 11 | + * with this source code in the file LICENSE. |
| 12 | + */ |
| 13 | + |
| 14 | +/** |
| 15 | + * CacheControl is a wrapper for the Cache-Control HTTP header. |
| 16 | + * |
| 17 | + * This class knows about allowed attributes |
| 18 | + * (and those that only apply to requests or responses). |
| 19 | + * |
| 20 | + * @package Symfony |
| 21 | + * @subpackage Components_RequestHandler |
| 22 | + * @author Fabien Potencier <fabien.potencier@symfony-project.com> |
| 23 | + */ |
| 24 | +class CacheControl |
| 25 | +{ |
| 26 | + protected $bag; |
| 27 | + protected $attributes; |
| 28 | + protected $type; |
| 29 | + |
| 30 | + /** |
| 31 | + * Constructor. |
| 32 | + * |
| 33 | + * @param Symfony\Components\RequestHandler\HeaderBag $bag A HeaderBag instance |
| 34 | + * @param string $header The value of the Cache-Control HTTP header |
| 35 | + * @param string $type The type (null, request, or response) |
| 36 | + */ |
| 37 | + public function __construct(HeaderBag $bag, $header, $type = null) |
| 38 | + { |
| 39 | + $this->bag = $bag; |
| 40 | + $this->attributes = $this->parse($header); |
| 41 | + |
| 42 | + if (null !== $type && !in_array($type, array('request', 'response'))) |
| 43 | + { |
| 44 | + throw new \InvalidArgumentException(sprintf('The "%s" type is not supported by the CacheControl constructor.', $type)); |
| 45 | + } |
| 46 | + $this->type = $type; |
| 47 | + } |
| 48 | + |
| 49 | + public function __toString() |
| 50 | + { |
| 51 | + $parts = array(); |
| 52 | + ksort($this->attributes); |
| 53 | + foreach ($this->attributes as $key => $value) |
| 54 | + { |
| 55 | + if (true === $value) |
| 56 | + { |
| 57 | + $parts[] = $key; |
| 58 | + } |
| 59 | + else |
| 60 | + { |
| 61 | + if (preg_match('#[^a-zA-Z0-9._-]#', $value)) |
| 62 | + { |
| 63 | + $value = '"'.$value.'"'; |
| 64 | + } |
| 65 | + |
| 66 | + $parts[] = "$key=$value"; |
| 67 | + } |
| 68 | + } |
| 69 | + |
| 70 | + return implode(',', $parts); |
| 71 | + } |
| 72 | + |
| 73 | + public function getMaxStale() |
| 74 | + { |
| 75 | + $this->checkAttribute('max-stale', 'request'); |
| 76 | + |
| 77 | + return array_key_exists('max-stale', $this->attributes) ? $this->attributes['max-stale'] : false; |
| 78 | + } |
| 79 | + |
| 80 | + public function setMaxStale($value) |
| 81 | + { |
| 82 | + $this->checkAttribute('max-stale', 'request'); |
| 83 | + |
| 84 | + $this->setValue('max-stale', $value); |
| 85 | + } |
| 86 | + |
| 87 | + public function getMinFresh() |
| 88 | + { |
| 89 | + $this->checkAttribute('min-fresh', 'request'); |
| 90 | + |
| 91 | + return array_key_exists('min-fresh', $this->attributes) ? $this->attributes['min-fresh'] : false; |
| 92 | + } |
| 93 | + |
| 94 | + public function setMinFresh($value) |
| 95 | + { |
| 96 | + $this->checkAttribute('min-fresh', 'request'); |
| 97 | + |
| 98 | + $this->setValue('min-fresh', $value); |
| 99 | + } |
| 100 | + |
| 101 | + public function isOnlyIfCached() |
| 102 | + { |
| 103 | + $this->checkAttribute('only-if-cached', 'request'); |
| 104 | + |
| 105 | + return array_key_exists('only-if-cached', $this->attributes); |
| 106 | + } |
| 107 | + |
| 108 | + public function setOnlyIfCached($value) |
| 109 | + { |
| 110 | + $this->checkAttribute('only-if-cached', 'request'); |
| 111 | + |
| 112 | + $this->setValue('only-if-cached', $value, true);
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code> |
| 113 | + } |
| 114 | + |
| 115 | + public function isPublic() |
| 116 | + { |
| 117 | + $this->checkAttribute('public', 'response'); |
| 118 | + |
| 119 | + return array_key_exists('public', $this->attributes); |
| 120 | + } |
| 121 | + |
| 122 | + public function setPublic($value) |
| 123 | + { |
| 124 | + $this->checkAttribute('public', 'response'); |
| 125 | + |
| 126 | + $this->setValue('public', $value, true); |
| 127 | + } |
| 128 | + |
| 129 | + public function isPrivate() |
| 130 | + { |
| 131 | + $this->checkAttribute('private', 'response'); |
| 132 | + |
| 133 | + return array_key_exists('private', $this->attributes); |
| 134 | + } |
| 135 | + |
| 136 | + public function getPrivate() |
| 137 | + { |
| 138 | + $this->checkAttribute('private', 'response'); |
| 139 | + |
| 140 | + return array_key_exists('private', $this->attributes) ? $this->attributes['private'] : false; |
| 141 | + } |
| 142 | + |
| 143 | + public function setPrivate($value) |
| 144 | + { |
| 145 | + $this->checkAttribute('private', 'response'); |
| 146 | + |
| 147 | + $this->setValue('private', $value, true); |
| 148 | + } |
| 149 | + |
| 150 | + public function isNoCache() |
| 151 | + { |
| 152 | + return array_key_exists('no-cache', $this->attributes); |
| 153 | + } |
| 154 | + |
| 155 | + public function getNoCache() |
| 156 | + { |
| 157 | + return array_key_exists('no-cache', $this->attributes) ? $this->attributes['no-cache'] : false; |
| 158 | + } |
| 159 | + |
| 160 | + public function setNoCache($value) |
| 161 | + { |
| 162 | + $this->setValue('no-cache', $value, true); |
| 163 | + } |
| 164 | + |
| 165 | + public function isNoStore() |
| 166 | + { |
| 167 | + return array_key_exists('no-store', $this->attributes); |
| 168 | + } |
| 169 | + |
| 170 | + public function setNoStore($value) |
| 171 | + { |
| 172 | + $this->setValue('no-store', $value, true); |
| 173 | + } |
| 174 | + |
| 175 | + public function isNoTransform() |
| 176 | + { |
| 177 | + return array_key_exists('no-tranform', $this->attributes); |
| 178 | + } |
| 179 | + |
| 180 | + public function setNoTransform($value) |
| 181 | + { |
| 182 | + $this->setValue('no-transform', $value, true); |
| 183 | + } |
| 184 | + |
| 185 | + public function getMaxAge() |
| 186 | + { |
| 187 | + return array_key_exists('max-age', $this->attributes) ? $this->attributes['max-age'] : null; |
| 188 | + } |
| 189 | + |
| 190 | + public function setMaxAge($age) |
| 191 | + { |
| 192 | + $this->setValue('max-age', (integer) $age); |
| 193 | + } |
| 194 | + |
| 195 | + public function getSharedMaxAge() |
| 196 | + { |
| 197 | + $this->checkAttribute('s-maxage', 'response'); |
| 198 | + |
| 199 | + return array_key_exists('s-maxage', $this->attributes) ? $this->attributes['s-maxage'] : null; |
| 200 | + } |
| 201 | + |
| 202 | + public function setSharedMaxAge($age) |
| 203 | + { |
| 204 | + $this->checkAttribute('s-maxage', 'response'); |
| 205 | + |
| 206 | + $this->setValue('s-maxage', (integer) $age); |
| 207 | + } |
| 208 | + |
| 209 | + public function mustRevalidate() |
| 210 | + { |
| 211 | + $this->checkAttribute('must-revalidate', 'response'); |
| 212 | + |
| 213 | + return array_key_exists('must-revalidate', $this->attributes); |
| 214 | + } |
| 215 | + |
| 216 | + public function setMustRevalidate($value) |
| 217 | + { |
| 218 | + $this->checkAttribute('must-revalidate', 'response'); |
| 219 | + |
| 220 | + $this->setValue('must-revalidate', $value); |
| 221 | + } |
| 222 | + |
| 223 | + public function mustProxyRevalidate() |
| 224 | + { |
| 225 | + $this->checkAttribute('proxy-revalidate', 'response'); |
| 226 | + |
| 227 | + return array_key_exists('proxy-revalidate', $this->attributes); |
| 228 | + } |
| 229 | + |
| 230 | + public function setProxyRevalidate($value) |
| 231 | + { |
| 232 | + $this->checkAttribute('proxy-revalidate', 'response'); |
| 233 | + |
| 234 | + $this->setValue('proxy-revalidate', $value); |
| 235 | + } |
| 236 | + |
| 237 | + /** |
| 238 | + * Parses a Cache-Control HTTP header. |
| 239 | + * |
| 240 | + * @param string $header The value of the Cache-Control HTTP header |
| 241 | + * |
| 242 | + * @param array An array representing the attribute values |
| 243 | + */ |
| 244 | + protected function parse($header) |
| 245 | + { |
| 246 | + $attributes = array(); |
| 247 | + preg_match_all('#([a-zA-Z][a-zA-Z_-]*)\s*(?:=(?:"([^"]*)"|([^ \t",;]*)))?#', $header, $matches, PREG_SET_ORDER); |
| 248 | + foreach ($matches as $match) |
| 249 | + { |
| 250 | + $attributes[strtolower($match[1])] = isset($match[2]) && $match[2] ? $match[2] : (isset($match[3]) ? $match[3] : true); |
| 251 | + } |
| 252 | + |
| 253 | + return $attributes; |
| 254 | + } |
| 255 | + |
| 256 | + protected function setValue($key, $value, $isBoolean = false) |
| 257 | + { |
| 258 | + if (false === $value) |
| 259 | + { |
| 260 | + unset($this->attributes[$key]); |
| 261 | + } |
| 262 | + else |
| 263 | + { |
| 264 | + $this->attributes[$key] = $isBoolean ? true : $value; |
| 265 | + } |
| 266 | + |
| 267 | + $this->bag->set('Cache-Control', (string) $this); |
| 268 | + } |
| 269 | + |
| 270 | + protected function checkAttribute($name, $expected) |
| 271 | + { |
| 272 | + if (null !== $this->type && $expected !== $this->type) |
| 273 | + { |
| 274 | + throw new \LogicException(sprintf("The property %s only applies to the %s Cache-Control.", $name, $expected)); |
| 275 | + } |
| 276 | + } |
| 277 | +} |
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