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Separate cache relevant methods #11
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| <?php | ||
| namespace Slim\Middleware\HttpCache; | ||
|
|
||
| use InvalidArgumentException; | ||
| use Psr\Http\Message\RequestInterface; | ||
| use Psr\Http\Message\ResponseInterface; | ||
|
|
||
| class CacheHelper | ||
| { | ||
| /** | ||
| * Enable client-side HTTP caching | ||
| * | ||
| * @param ResponseInterface $response PSR7 response object | ||
| * @param string $type Cache-Control type: "private" or "public" | ||
| * @param null|int|string $maxAge Maximum cache age (integer timestamp or datetime string) | ||
| * | ||
| * @return ResponseInterface A new PSR7 response object with `Cache-Control` header | ||
| * @throws InvalidArgumentException if the cache-control type is invalid | ||
| */ | ||
| public function allowCache(ResponseInterface $response, $type = 'private', $maxAge = null) | ||
| { | ||
| if (!in_array($type, ['private', 'public'])) { | ||
| throw new InvalidArgumentException('Invalid Cache-Control type. Must be "public" or "private".'); | ||
| } | ||
| $headerValue = $type; | ||
| if ($maxAge) { | ||
| if (!is_integer($maxAge)) { | ||
| $maxAge = strtotime($maxAge); | ||
| } | ||
| $headerValue = $headerValue . ', max-age=' . $maxAge; | ||
| } | ||
|
|
||
| return $response->withHeader('Cache-Control', $headerValue); | ||
| } | ||
|
|
||
| /** | ||
| * Disable client-side HTTP caching | ||
| * | ||
| * @param ResponseInterface $response PSR7 response object | ||
| * | ||
| * @return ResponseInterface A new PSR7 response object with `Cache-Control` header | ||
| */ | ||
| public function denyCache(ResponseInterface $response) | ||
| { | ||
| return $response->withHeader('Cache-Control', 'no-store,no-cache'); | ||
| } | ||
|
|
||
| /** | ||
| * Add `Expires` header to PSR7 response object | ||
| * | ||
| * @param ResponseInterface $response A PSR7 response object | ||
| * @param int|string $time A UNIX timestamp or a valid `strtotime()` string | ||
| * | ||
| * @return ResponseInterface A new PSR7 response object with `Expires` header | ||
| * @throws InvalidArgumentException if the expiration date cannot be parsed | ||
| */ | ||
| public function withExpires(ResponseInterface $response, $time) | ||
| { | ||
| if (!is_integer($time)) { | ||
| $time = strtotime($time); | ||
| if ($time === false) { | ||
| throw new InvalidArgumentException('Expiration value could not be parsed with `strtotime()`.'); | ||
| } | ||
| } | ||
|
|
||
| return $response->withHeader('Expires', gmdate('D, d M Y H:i:s T', $time)); | ||
| } | ||
|
|
||
| /** | ||
| * Add `ETag` header to PSR7 response object | ||
| * | ||
| * @param ResponseInterface $response A PSR7 response object | ||
| * @param string $value The ETag value | ||
| * @param string $type ETag type: "strong" or "weak" | ||
| * | ||
| * @return ResponseInterface A new PSR7 response object with `ETag` header | ||
| * @throws InvalidArgumentException if the etag type is invalid | ||
| */ | ||
| public function withEtag(ResponseInterface $response, $value, $type = 'strong') | ||
| { | ||
| if (!in_array($type, ['strong', 'weak'])) { | ||
| throw new InvalidArgumentException('Invalid etag type. Must be "strong" or "weak".'); | ||
| } | ||
| $value = '"' . $value . '"'; | ||
| if ($type === 'weak') { | ||
| $value = 'W/' . $value; | ||
| } | ||
|
|
||
| return $response->withHeader('ETag', $value); | ||
| } | ||
|
|
||
| /** | ||
| * Add `Last-Modified` header to PSR7 response object | ||
| * | ||
| * @param ResponseInterface $response A PSR7 response object | ||
| * @param int|string $time A UNIX timestamp or a valid `strtotime()` string | ||
| * | ||
| * @return ResponseInterface A new PSR7 response object with `Last-Modified` header | ||
| * @throws InvalidArgumentException if the last modified date cannot be parsed | ||
| */ | ||
| public function withLastModified(ResponseInterface $response, $time) | ||
| { | ||
| if (!is_integer($time)) { | ||
| $time = strtotime($time); | ||
| if ($time === false) { | ||
| throw new InvalidArgumentException('Last Modified value could not be parsed with `strtotime()`.'); | ||
| } | ||
| } | ||
|
|
||
| return $response->withHeader('Last-Modified', gmdate('D, d M Y H:i:s T', $time)); | ||
| } | ||
|
|
||
| /** | ||
| * Compares the request and the response to determine if the client still has a valid copy. | ||
| * | ||
| * @param RequestInterface $request | ||
| * @param ResponseInterface $response | ||
| * @return bool | ||
| */ | ||
| public function isStillValid(RequestInterface $request, ResponseInterface $response) | ||
| { | ||
| // Last-Modified header and conditional GET check | ||
| $lastModified = $response->getHeaderLine('Last-Modified'); | ||
|
|
||
| if ($lastModified) { | ||
| if (!is_integer($lastModified)) { | ||
| $lastModified = strtotime($lastModified); | ||
| } | ||
|
|
||
| $ifModifiedSince = $request->getHeaderLine('If-Modified-Since'); | ||
|
|
||
| if ($ifModifiedSince && $lastModified <= strtotime($ifModifiedSince)) { | ||
| return true; | ||
| } | ||
| } | ||
|
|
||
| // ETag header and conditional GET check | ||
| $etag = $response->getHeaderLine('ETag'); | ||
|
|
||
| if ($etag) { | ||
| $ifNoneMatch = $request->getHeaderLine('If-None-Match'); | ||
|
|
||
| if ($ifNoneMatch) { | ||
| $etagList = preg_split('@\s*,\s*@', $ifNoneMatch); | ||
| if (in_array(str_replace('"', '', $etag), $etagList) || in_array('*', $etagList)) { | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
| } |
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$cachecan also benull:@param CacheHelper|null $cache The cache object to use.