HTTPCacheControl::applyChangeLevel() - Code Metrics - Inspection of "NEW Add better HTTP cache-control manipulation (#8..." - silverstripe/silverstripe-framework - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — 3 ( 1d0cff...2b4954 )

by Damian

created 2018-06-07 23:56 UTC

HTTPCacheControl::applyChangeLevel() A

↳ Parent: HTTPCacheControl

Complexity

Conditions	3
Paths	4

Size

Total Lines	9
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
eloc	6
nc	4
nop	2
dl	0
loc	9
rs	9.6666
c	0
b	0
f	0

<?php

/**
 * Class HTTPCacheControl
 *
 * @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
 */
class HTTPCacheControl extends SS_Object {

	/**
	 * @var static
	 */
	private static $inst;

	/**
	 * Store for all the current directives and their values
	 * Starts with an implicit config for disabled caching
	 *
	 * @var array
	 */
	private $state = array();

	/**
	 * Forcing level of previous setting; higher number wins
	 * Combination of consts belo
	 *w
	 * @var int
	 */
	protected $forcingLevel = 0;

	/**
	 * Forcing level forced, optionally combined with one of the below.
	 */
	const LEVEL_FORCED = 10;

	/**
	 * Forcing level caching disabled. Overrides public/private.
	 */
	const LEVEL_DISABLED = 3;

	/**
	 * Forcing level private-cached. Overrides public.
	 */
	const LEVEL_PRIVATE = 2;

	/**
	 * Forcing level public cached. Lowest priority.
	 */
	const LEVEL_PUBLIC = 1;

	/**
	 * Forcing level caching enabled.
	 */
	const LEVEL_ENABLED = 0;


	/**
	 * A list of allowed cache directives for HTTPResponses
	 *
	 * This doesn't include any experimental directives,
	 * use the config system to add to these if you want to enable them
	 *
	 * @config
	 * @var array
	 */
	private static $allowed_directives = array(
		'public',
		'private',
		'no-cache',
		'max-age',
		's-maxage',
		'must-revalidate',
		'proxy-revalidate',
		'no-store',
		'no-transform',
	);

	public function __construct()
	{
		parent::__construct();

		// If we've not been provided an initial state, then grab HTTP.cache_contrpl from config
		if (!$this->state) {

			$this->setDirectivesFromArray(Config::inst()->get('HTTP', 'cache_control'));
		}
	}

	/**
	 * Instruct the cache to apply a change with a given level, optionally
	 * modifying it with a force flag to increase priority of this action.
	 *
	 * If the apply level was successful, the change is made and the internal level
	 * threshold is incremented.
	 *
	 * @param int $level Priority of the given change
	 * @param bool $force If usercode has requested this action is forced to a higher priority.
	 * Note: Even if $force is set to true, other higher-priority forced changes can still
	 * cause a change to be rejected if it is below the required threshold.
	 * @return bool True if the given change is accepted, and that the internal
	 * level threshold is updated (if necessary) to the new minimum level.
	 */
	protected function applyChangeLevel($level, $force)
	{
		$forcingLevel = $level + ($force ? self::LEVEL_FORCED : 0);
		if ($forcingLevel < $this->forcingLevel) {
			return false;
		}
		$this->forcingLevel = $forcingLevel;
		return true;
	}

	/**
	 * Low level method for setting directives include any experimental or custom ones added via config
	 *
	 * @param string $directive
	 * @param string|bool $value
	 *
	 * @return $this
	 */
	public function setDirective($directive, $value = null)
	{
		// make sure the directive is in the list of allowed directives
		$allowedDirectives = $this->config()->get('allowed_directives');
		$directive = strtolower($directive);
		if (in_array($directive, $allowedDirectives)) {
			$this->state[$directive] = $value;
		} else {
			throw new InvalidArgumentException('Directive ' . $directive . ' is not allowed');
		}
		return $this;
	}

	/**
	 * Low level method to set directives from an associative array
	 *
	 * @param array $directives
	 *
	 * @return $this
	 */
	public function setDirectivesFromArray($directives)
	{
		foreach ($directives as $directive => $value) {
			// null values mean remove
			if (is_null($value)) {
				$this->removeDirective($directive);
			} else {
				// for legacy reasons we accept the string literal "true" as a bool
				// a bool value of true means there is no explicit value for the directive
				if ($value && (is_bool($value) || strtolower($value) === 'true')) {
					$value = null;
				}
				$this->setDirective($directive, $value);
			}
		}
		return $this;
	}

	/**
	 * Low level method for removing directives
	 *
	 * @param string $directive
	 *
	 * @return $this
	 */
	public function removeDirective($directive)
	{
		unset($this->state[strtolower($directive)]);
		return $this;
	}

	/**
	 * Low level method to check if a directive is currently set
	 *
	 * @param string $directive
	 *
	 * @return bool
	 */
	public function hasDirective($directive)
	{
		return array_key_exists(strtolower($directive), $this->state);
	}

	/**
	 * Low level method to get the value of a directive
	 *
	 * Note that `null` value is acceptable for a directive
	 *
	 * @param string $directive
	 *
	 * @return string|false|null
	 */
	public function getDirective($directive)
	{
		if ($this->hasDirective($directive)) {
			return $this->state[strtolower($directive)];
		}
		return false;
	}

	/**
	 * The cache should not store anything about the client request or server response.
	 *
	 * Set the no-store directive (also removes max-age and s-maxage for consistency purposes)
	 *
	 * @param bool $noStore
	 *
	 * @return $this
	 */
	public function setNoStore($noStore = true)
	{
		if ($noStore) {
			$this->setDirective('no-store');
			$this->removeDirective('max-age');
			$this->removeDirective('s-maxage');
		} else {
			$this->removeDirective('no-store');
		}
		return $this;
	}

	/**
	 * Forces caches to submit the request to the origin server for validation before releasing a cached copy.
	 *
	 * @param bool $noCache
	 *
	 * @return $this
	 */
	public function setNoCache($noCache = true)
	{
		if ($noCache) {
			$this->setDirective('no-cache');
		} else {
			$this->removeDirective('no-cache');
		}
		return $this;
	}

	/**
	 * Specifies the maximum amount of time (seconds) a resource will be considered fresh.
	 * This directive is relative to the time of the request.
	 *
	 * @param int $age
	 *
	 * @return $this
	 */
	public function setMaxAge($age)
	{
		$this->setDirective('max-age', $age);
		return $this;
	}

	/**
	 * Overrides max-age or the Expires header, but it only applies to shared caches (e.g., proxies)
	 * and is ignored by a private cache.
	 *
	 * @param int $age
	 *
	 * @return $this
	 */
	public function setSharedMaxAge($age)
	{
		$this->setDirective('s-maxage', $age);
		return $this;
	}

	/**
	 * The cache must verify the status of the stale resources before using it and expired ones should not be used.
	 *
	 * @param bool $mustRevalidate
	 *
	 * @return $this
	 */
	public function setMustRevalidate($mustRevalidate = true)
	{
		if ($mustRevalidate) {
			$this->setDirective('must-revalidate');
		} else {
			$this->removeDirective('must-revalidate');
		}
		return $this;
	}

	/**
	 * Simple way to set cache control header to a cacheable state.
	 * Use this method over `publicCache()` if you are unsure about caching details.
	 *
	 * Removes `no-store` and `no-cache` directives; other directives will remain in place.
	 * Use alongside `setMaxAge()` to indicate caching.
	 *
	 * Does not set `public` directive. Usually, `setMaxAge()` is sufficient. Use `publicCache()` if this is explicitly required.
	 * See https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching#public_vs_private
	 *
	 * @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
	 * @param bool $force Force the cache to public even if its unforced private or public
	 * @return $this
	 */
	public function enableCache($force = false)
	{
		// Only execute this if its forcing level is high enough
		if (!$this->applyChangeLevel(self::LEVEL_ENABLED, $force)) {
			SS_Log::log("Call to enableCache($force) didn't execute as it's lower priority than a previous call", SS_Log::DEBUG);
			return $this;
		}

		$this->removeDirective('no-store');
		$this->removeDirective('no-cache');
		return $this;
	}

	/**
	 * Simple way to set cache control header to a non-cacheable state.
	 * Use this method over `privateCache()` if you are unsure about caching details.
	 * Takes precendence over unforced `enableCache()`, `privateCache()` or `publicCache()` calls.
	 *
	 * Removes all state and replaces it with `no-cache, no-store, must-revalidate`. Although `no-store` is sufficient
	 * the others are added under recommendation from Mozilla (https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#Examples)
	 *
	 * Does not set `private` directive, use `privateCache()` if this is explicitly required.
	 * See https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching#public_vs_private
	 *
	 * @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
	 * @param bool $force Force the cache to diabled even if it's forced private or public
	 * @return $this
	 */
	public function disableCache($force = false)
	{
		// Only execute this if its forcing level is high enough
		if (!$this->applyChangeLevel(self::LEVEL_DISABLED, $force )) {
			SS_Log::log("Call to disableCache($force) didn't execute as it's lower priority than a previous call", SS_Log::DEBUG);
			return $this;
		}

		$this->state = array(
			'no-cache' => null,
			'no-store' => null,
			'must-revalidate' => null,
		);
		return $this;
	}

	/**
	 * Advanced way to set cache control header to a non-cacheable state.
	 * Indicates that the response is intended for a single user and must not be stored by a shared cache.
	 * A private cache (e.g. Web Browser) may store the response. Also removes `public` as this is a contradictory directive.
	 *
	 * @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
	 * @param bool $force Force the cache to private even if it's forced public
	 * @return $this
	 */
	public function privateCache($force = false)
	{
		// Only execute this if its forcing level is high enough
		if (!$this->applyChangeLevel(self::LEVEL_PRIVATE, $force)) {
			SS_Log::log("Call to privateCache($force) didn't execute as it's lower priority than a previous call", SS_Log::DEBUG);
			return $this;
		}

		// Update the directives
		$this->setDirective('private');
		$this->removeDirective('public');
		$this->removeDirective('no-cache');
		$this->removeDirective('no-store');
		return $this;
	}

	/**
 	 * Advanced way to set cache control header to a cacheable state.
	 * Indicates that the response may be cached by any cache. (eg: CDNs, Proxies, Web browsers)
	 * Also removes `private` as this is a contradictory directive
	 *
	 * @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
	 * @param bool $force Force the cache to public even if it's private, unless it's been forced private
	 * @return $this
	 */
	public function publicCache($force = false)
	{
		// Only execute this if its forcing level is high enough
		if (!$this->applyChangeLevel(self::LEVEL_PUBLIC, $force)) {
			SS_Log::log("Call to publicCache($force) didn't execute as it's lower priority than a previous call", SS_Log::DEBUG);
			return $this;
		}

		$this->setDirective('public');
		$this->removeDirective('private');
		$this->removeDirective('no-cache');
		$this->removeDirective('no-store');
		return $this;
	}

	/**
	 * Generate and add the `Cache-Control` header to a response object
	 *
	 * @param SS_HTTPResponse $response
	 *
	 * @return $this
	 */
	public function applyToResponse($response)
	{
		$headers = $this->generateHeaders();
		foreach ($headers as $name => $value) {
			$response->addHeader($name, $value);
		}
		return $this;
	}

	/**
	 * Generate the cache header
	 *
	 * @return string
	 */
	protected function generateCacheHeader()
	{
		$cacheControl = array();
		foreach ($this->state as $directive => $value) {
			if (is_null($value)) {
				$cacheControl[] = $directive;
			} else {
				$cacheControl[] = $directive . '=' . $value;
			}
		}
		return implode(', ', $cacheControl);
	}

	/**
	 * Generate all headers to output
	 *
	 * @return array
	 */
	public function generateHeaders()
	{
		return array(
			'Cache-Control' => $this->generateCacheHeader(),
		);
	}

	/**
	 * Reset registered http cache control and force a fresh instance to be built
	 */
	public static function reset() {
		Injector::inst()->unregisterNamedObject(__CLASS__);
	}
}


1			<?php
2
3			/**
4			* Class HTTPCacheControl
5			*
6			* @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
7			*/
8			class HTTPCacheControl extends SS_Object {
9
10			/**
11			* @var static
12			*/
13			private static $inst;
14
15			/**
16			* Store for all the current directives and their values
17			* Starts with an implicit config for disabled caching
18			*
19			* @var array
20			*/
21			private $state = array();
22
23			/**
24			* Forcing level of previous setting; higher number wins
25			* Combination of consts belo
26			*w
27			* @var int
28			*/
29			protected $forcingLevel = 0;
30
31			/**
32			* Forcing level forced, optionally combined with one of the below.
33			*/
34			const LEVEL_FORCED = 10;
35
36			/**
37			* Forcing level caching disabled. Overrides public/private.
38			*/
39			const LEVEL_DISABLED = 3;
40
41			/**
42			* Forcing level private-cached. Overrides public.
43			*/
44			const LEVEL_PRIVATE = 2;
45
46			/**
47			* Forcing level public cached. Lowest priority.
48			*/
49			const LEVEL_PUBLIC = 1;
50
51			/**
52			* Forcing level caching enabled.
53			*/
54			const LEVEL_ENABLED = 0;
55
56
57			/**
58			* A list of allowed cache directives for HTTPResponses
59			*
60			* This doesn't include any experimental directives,
61			* use the config system to add to these if you want to enable them
62			*
63			* @config
64			* @var array
65			*/
66			private static $allowed_directives = array(
67			'public',
68			'private',
69			'no-cache',
70			'max-age',
71			's-maxage',
72			'must-revalidate',
73			'proxy-revalidate',
74			'no-store',
75			'no-transform',
76			);
77
78			public function __construct()
79			{
80			parent::__construct();
81
82			// If we've not been provided an initial state, then grab HTTP.cache_contrpl from config
83			if (!$this->state) {
			0 ignored issues – show Bug Best Practice introduced 2018-06-01 04:33 UTC by Report Bug Copy Issue Report The expression `$this->state` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
84			$this->setDirectivesFromArray(Config::inst()->get('HTTP', 'cache_control'));
85			}
86			}
87
88			/**
89			* Instruct the cache to apply a change with a given level, optionally
90			* modifying it with a force flag to increase priority of this action.
91			*
92			* If the apply level was successful, the change is made and the internal level
93			* threshold is incremented.
94			*
95			* @param int $level Priority of the given change
96			* @param bool $force If usercode has requested this action is forced to a higher priority.
97			* Note: Even if $force is set to true, other higher-priority forced changes can still
98			* cause a change to be rejected if it is below the required threshold.
99			* @return bool True if the given change is accepted, and that the internal
100			* level threshold is updated (if necessary) to the new minimum level.
101			*/
102			protected function applyChangeLevel($level, $force)
103			{
104			$forcingLevel = $level + ($force ? self::LEVEL_FORCED : 0);
105			if ($forcingLevel < $this->forcingLevel) {
106			return false;
107			}
108			$this->forcingLevel = $forcingLevel;
109			return true;
110			}
111
112			/**
113			* Low level method for setting directives include any experimental or custom ones added via config
114			*
115			* @param string $directive
116			* @param string\|bool $value
117			*
118			* @return $this
119			*/
120			public function setDirective($directive, $value = null)
121			{
122			// make sure the directive is in the list of allowed directives
123			$allowedDirectives = $this->config()->get('allowed_directives');
124			$directive = strtolower($directive);
125			if (in_array($directive, $allowedDirectives)) {
126			$this->state[$directive] = $value;
127			} else {
128			throw new InvalidArgumentException('Directive ' . $directive . ' is not allowed');
129			}
130			return $this;
131			}
132
133			/**
134			* Low level method to set directives from an associative array
135			*
136			* @param array $directives
137			*
138			* @return $this
139			*/
140			public function setDirectivesFromArray($directives)
141			{
142			foreach ($directives as $directive => $value) {
143			// null values mean remove
144			if (is_null($value)) {
145			$this->removeDirective($directive);
146			} else {
147			// for legacy reasons we accept the string literal "true" as a bool
148			// a bool value of true means there is no explicit value for the directive
149			if ($value && (is_bool($value) \|\| strtolower($value) === 'true')) {
150			$value = null;
151			}
152			$this->setDirective($directive, $value);
153			}
154			}
155			return $this;
156			}
157
158			/**
159			* Low level method for removing directives
160			*
161			* @param string $directive
162			*
163			* @return $this
164			*/
165			public function removeDirective($directive)
166			{
167			unset($this->state[strtolower($directive)]);
168			return $this;
169			}
170
171			/**
172			* Low level method to check if a directive is currently set
173			*
174			* @param string $directive
175			*
176			* @return bool
177			*/
178			public function hasDirective($directive)
179			{
180			return array_key_exists(strtolower($directive), $this->state);
181			}
182
183			/**
184			* Low level method to get the value of a directive
185			*
186			* Note that `null` value is acceptable for a directive
187			*
188			* @param string $directive
189			*
190			* @return string\|false\|null
191			*/
192			public function getDirective($directive)
193			{
194			if ($this->hasDirective($directive)) {
195			return $this->state[strtolower($directive)];
196			}
197			return false;
198			}
199
200			/**
201			* The cache should not store anything about the client request or server response.
202			*
203			* Set the no-store directive (also removes max-age and s-maxage for consistency purposes)
204			*
205			* @param bool $noStore
206			*
207			* @return $this
208			*/
209			public function setNoStore($noStore = true)
210			{
211			if ($noStore) {
212			$this->setDirective('no-store');
213			$this->removeDirective('max-age');
214			$this->removeDirective('s-maxage');
215			} else {
216			$this->removeDirective('no-store');
217			}
218			return $this;
219			}
220
221			/**
222			* Forces caches to submit the request to the origin server for validation before releasing a cached copy.
223			*
224			* @param bool $noCache
225			*
226			* @return $this
227			*/
228			public function setNoCache($noCache = true)
229			{
230			if ($noCache) {
231			$this->setDirective('no-cache');
232			} else {
233			$this->removeDirective('no-cache');
234			}
235			return $this;
236			}
237
238			/**
239			* Specifies the maximum amount of time (seconds) a resource will be considered fresh.
240			* This directive is relative to the time of the request.
241			*
242			* @param int $age
243			*
244			* @return $this
245			*/
246			public function setMaxAge($age)
247			{
248			$this->setDirective('max-age', $age);
249			return $this;
250			}
251
252			/**
253			* Overrides max-age or the Expires header, but it only applies to shared caches (e.g., proxies)
254			* and is ignored by a private cache.
255			*
256			* @param int $age
257			*
258			* @return $this
259			*/
260			public function setSharedMaxAge($age)
261			{
262			$this->setDirective('s-maxage', $age);
263			return $this;
264			}
265
266			/**
267			* The cache must verify the status of the stale resources before using it and expired ones should not be used.
268			*
269			* @param bool $mustRevalidate
270			*
271			* @return $this
272			*/
273			public function setMustRevalidate($mustRevalidate = true)
274			{
275			if ($mustRevalidate) {
276			$this->setDirective('must-revalidate');
277			} else {
278			$this->removeDirective('must-revalidate');
279			}
280			return $this;
281			}
282
283			/**
284			* Simple way to set cache control header to a cacheable state.
285			* Use this method over `publicCache()` if you are unsure about caching details.
286			*
287			* Removes `no-store` and `no-cache` directives; other directives will remain in place.
288			* Use alongside `setMaxAge()` to indicate caching.
289			*
290			* Does not set `public` directive. Usually, `setMaxAge()` is sufficient. Use `publicCache()` if this is explicitly required.
291			* See https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching#public_vs_private
292			*
293			* @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
294			* @param bool $force Force the cache to public even if its unforced private or public
295			* @return $this
296			*/
297			public function enableCache($force = false)
298			{
299			// Only execute this if its forcing level is high enough
300			if (!$this->applyChangeLevel(self::LEVEL_ENABLED, $force)) {
301			SS_Log::log("Call to enableCache($force) didn't execute as it's lower priority than a previous call", SS_Log::DEBUG);
302			return $this;
303			}
304
305			$this->removeDirective('no-store');
306			$this->removeDirective('no-cache');
307			return $this;
308			}
309
310			/**
311			* Simple way to set cache control header to a non-cacheable state.
312			* Use this method over `privateCache()` if you are unsure about caching details.
313			* Takes precendence over unforced `enableCache()`, `privateCache()` or `publicCache()` calls.
314			*
315			* Removes all state and replaces it with `no-cache, no-store, must-revalidate`. Although `no-store` is sufficient
316			* the others are added under recommendation from Mozilla (https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#Examples)
317			*
318			* Does not set `private` directive, use `privateCache()` if this is explicitly required.
319			* See https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching#public_vs_private
320			*
321			* @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
322			* @param bool $force Force the cache to diabled even if it's forced private or public
323			* @return $this
324			*/
325			public function disableCache($force = false)
326			{
327			// Only execute this if its forcing level is high enough
328			if (!$this->applyChangeLevel(self::LEVEL_DISABLED, $force )) {
329			SS_Log::log("Call to disableCache($force) didn't execute as it's lower priority than a previous call", SS_Log::DEBUG);
330			return $this;
331			}
332
333			$this->state = array(
334			'no-cache' => null,
335			'no-store' => null,
336			'must-revalidate' => null,
337			);
338			return $this;
339			}
340
341			/**
342			* Advanced way to set cache control header to a non-cacheable state.
343			* Indicates that the response is intended for a single user and must not be stored by a shared cache.
344			* A private cache (e.g. Web Browser) may store the response. Also removes `public` as this is a contradictory directive.
345			*
346			* @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
347			* @param bool $force Force the cache to private even if it's forced public
348			* @return $this
349			*/
350			public function privateCache($force = false)
351			{
352			// Only execute this if its forcing level is high enough
353			if (!$this->applyChangeLevel(self::LEVEL_PRIVATE, $force)) {
354			SS_Log::log("Call to privateCache($force) didn't execute as it's lower priority than a previous call", SS_Log::DEBUG);
355			return $this;
356			}
357
358			// Update the directives
359			$this->setDirective('private');
360			$this->removeDirective('public');
361			$this->removeDirective('no-cache');
362			$this->removeDirective('no-store');
363			return $this;
364			}
365
366			/**
367			* Advanced way to set cache control header to a cacheable state.
368			* Indicates that the response may be cached by any cache. (eg: CDNs, Proxies, Web browsers)
369			* Also removes `private` as this is a contradictory directive
370			*
371			* @see https://docs.silverstripe.org/en/developer_guides/performance/http_cache_headers/
372			* @param bool $force Force the cache to public even if it's private, unless it's been forced private
373			* @return $this
374			*/
375			public function publicCache($force = false)
376			{
377			// Only execute this if its forcing level is high enough
378			if (!$this->applyChangeLevel(self::LEVEL_PUBLIC, $force)) {
379			SS_Log::log("Call to publicCache($force) didn't execute as it's lower priority than a previous call", SS_Log::DEBUG);
380			return $this;
381			}
382
383			$this->setDirective('public');
384			$this->removeDirective('private');
385			$this->removeDirective('no-cache');
386			$this->removeDirective('no-store');
387			return $this;
388			}
389
390			/**
391			* Generate and add the `Cache-Control` header to a response object
392			*
393			* @param SS_HTTPResponse $response
394			*
395			* @return $this
396			*/
397			public function applyToResponse($response)
398			{
399			$headers = $this->generateHeaders();
400			foreach ($headers as $name => $value) {
401			$response->addHeader($name, $value);
402			}
403			return $this;
404			}
405
406			/**
407			* Generate the cache header
408			*
409			* @return string
410			*/
411			protected function generateCacheHeader()
412			{
413			$cacheControl = array();
414			foreach ($this->state as $directive => $value) {
415			if (is_null($value)) {
416			$cacheControl[] = $directive;
417			} else {
418			$cacheControl[] = $directive . '=' . $value;
419			}
420			}
421			return implode(', ', $cacheControl);
422			}
423
424			/**
425			* Generate all headers to output
426			*
427			* @return array
428			*/
429			public function generateHeaders()
430			{
431			return array(
432			'Cache-Control' => $this->generateCacheHeader(),
433			);
434			}
435
436			/**
437			* Reset registered http cache control and force a fresh instance to be built
438			*/
439			public static function reset() {
440			Injector::inst()->unregisterNamedObject(__CLASS__);
441			}
442			}
443

silverstripe / silverstripe-framework

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HTTPCacheControl::applyChangeLevel() A

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