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Implementing RequestHandler::checkNotModified() as a helper for HTTP caching

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This commit is contained in:
Jose Lorenzo Rodriguez 2012-01-13 01:36:31 -04:30
parent 8e979cc83e
commit dffe84cfbc
2 changed files with 134 additions and 0 deletions
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29
lib/Cake/Controller/Component/RequestHandlerComponent.php
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@ -704,4 +704,33 @@ class RequestHandlerComponent extends Component {
}
$this->_inputTypeMap[$type] = $handler;
}
/**
* Checks whether a response has not been modified according to the 'If-None-Match'
* (Etags) and 'If-Modified-Since' (last modification date) request
* headers headers. If the response is detected to be not modified, it
* is marked as so accordingly so the client can be informed of that.
*
* In order to mark a response as not modified, you need to set at least
* the Last-Modified response header or a response etag to be compared
* with the request itself
*
* @return boolean whether the response was marked as not modified or
* not
**/
public function checkNotModified() {
$etags = preg_split('/\s*,\s*/', $this->request->header('If-None-Match'), null, PREG_SPLIT_NO_EMPTY);
$modifiedSince = $this->request->header('If-Modified-Since');
if ($responseTag = $this->response->etag()) {
$etagMatches = in_array('*', $etags) || in_array($responseTag, $etags);
}
if ($modifiedSince) {
$timeMatches = strtotime($this->response->modified()) == strtotime($modifiedSince);
}
$notModified = (!isset($etagMatches) || $etagMatches) && (!isset($timeMatches) || $timeMatches);
if ($notModified) {
$this->response->notModified();
}
return $notModified;
}
}