Class DispatcherFilter
This abstract class represents a filter to be applied to a dispatcher cycle. It acts as an event listener with the ability to alter the request or response as needed before it is handled by a controller or after the response body has already been built.
Subclasses of this class use a class naming convention having a Filter
suffix.
Limiting filters to specific paths
By using the for
option you can limit with request paths a filter is applied to. Both the before and after event will have the same conditions applied to them. For example, if you only wanted a filter applied to blog requests you could do:
$filter = new BlogFilter(['for' => '/blog']);
When the above filter is connected to a dispatcher it will only fire its beforeDispatch
and afterDispatch
methods on requests that start with /blog
.
The for condition can also be a regular expression by using the preg:
prefix:
$filter = new BlogFilter(['for' => 'preg:#^/blog/\d+$#']);
Limiting filters based on conditions
In addition to simple path based matching you can use a closure to match on arbitrary request or response conditions. For example:
$cookieMonster = new CookieFilter([ 'when' => function ($req, $res) { // Custom code goes here. } ]);
If your when condition returns true
the before/after methods will be called.
When using the for
or when
matchers, conditions will be re-checked on the before and after callback as the conditions could change during the dispatch cycle.
- Cake\Routing\DispatcherFilter implements Cake\Event\EventListenerInterface uses Cake\Core\InstanceConfigTrait
Direct known subclasses
Cake\Routing\Filter\AssetFilter, Cake\Routing\Filter\ControllerFactoryFilter, Cake\Routing\Filter\LocaleSelectorFilter, Cake\Routing\Filter\RoutingFilterMethod Detail
__constructsource public
__construct( array $config [] )
Constructor.
Parameters
- array
$config
optional [] - Settings for the filter.
Throws
InvalidArgumentException
When 'when' conditions are not callable.
afterDispatchsource public
afterDispatch( Cake\Event\Event $event )
Method called after the controller served a request and generated a response. It is possible to alter the response object at this point as it is not sent to the client yet.
If false is returned, the event will be stopped and no more listeners will be notified. Alternatively you can call $event->stopPropagation()
to achieve the same result.
Parameters
-
Cake\Event\Event
$event
- container object having the
request
andresponse
keys in the data property.
beforeDispatchsource public
beforeDispatch( Cake\Event\Event $event )
Method called before the controller is instantiated and called to serve a request. If used with default priority, it will be called after the Router has parsed the URL and set the routing params into the request object.
If a Cake\Network\Response object instance is returned, it will be served at the end of the event cycle, not calling any controller as a result. This will also have the effect of not calling the after event in the dispatcher.
If false is returned, the event will be stopped and no more listeners will be notified. Alternatively you can call $event->stopPropagation()
to achieve the same result.
Parameters
-
Cake\Event\Event
$event
- container object having the
request
,response
andadditionalParams
keys in the data property.
handlesource public
handle( Cake\Event\Event $event )
Handler method that applies conditions and resolves the correct method to call.
Parameters
-
Cake\Event\Event
$event
- The event instance.
Returns
mixed
mixed
implementedEventssource public
implementedEvents( )
Returns the list of events this filter listens to. Dispatcher notifies 2 different events Dispatcher.before
and Dispatcher.after
. By default this class will attach preDispatch
and postDispatch
method respectively.
Override this method at will to only listen to the events you are interested in.
Returns
array
array
Implementation of
Cake\Event\EventListenerInterface::implementedEvents()
matchessource public
matches( Cake\Event\Event $event )
Check to see if the incoming request matches this filter's criteria.
Parameters
-
Cake\Event\Event
$event
- The event to match.
Returns
boolean
bool
Methods used from Cake\Core\InstanceConfigTrait
_configDeletesource protected
_configDelete( string $key )
Delete a single config key
Parameters
- string
$key
- Key to delete.
Throws
Cake\Core\Exception\Exception
if attempting to clobber existing config
_configReadsource protected
_configRead( string|null $key )
Read a config variable
Parameters
- string|null
$key
- Key to read.
Returns
mixed
mixed
_configWritesource protected
_configWrite( string|array $key , mixed $value , boolean|string $merge false )
Write a config variable
Parameters
- string|array
$key
- Key to write to.
- mixed
$value
- Value to write.
- boolean|string
$merge
optional false - True to merge recursively, 'shallow' for simple merge, false to overwrite, defaults to false.
Throws
Cake\Core\Exception\Exception
if attempting to clobber existing config
configsource public
config( string|array|null $key null , mixed|null $value null , boolean $merge true )
Usage
Reading the whole config:
$this->config();
Reading a specific value:
$this->config('key');
Reading a nested value:
$this->config('some.nested.key');
Setting a specific value:
$this->config('key', $value);
Setting a nested value:
$this->config('some.nested.key', $value);
Updating multiple config settings at the same time:
$this->config(['one' => 'value', 'another' => 'value']);
Parameters
- string|array|null
$key
optional null - The key to get/set, or a complete array of configs.
- mixed|null
$value
optional null - The value to set.
- boolean
$merge
optional true - Whether to recursively merge or overwrite existing config, defaults to true.
Returns
mixed
Config value being read, or the object itself on write operations.
Throws
Cake\Core\Exception\Exception
When trying to set a key that is invalid.
configShallowsource public
configShallow( string|array $key , mixed|null $value null )
Merge provided config with existing config. Unlike config()
which does a recursive merge for nested keys, this method does a simple merge.
Setting a specific value:
$this->config('key', $value);
Setting a nested value:
$this->config('some.nested.key', $value);
Updating multiple config settings at the same time:
$this->config(['one' => 'value', 'another' => 'value']);
Parameters
- string|array
$key
- The key to set, or a complete array of configs.
- mixed|null
$value
optional null - The value to set.
Returns
mixed
$this The object itself.
Properties summary
Properties used from Cake\Core\InstanceConfigTrait
$_configInitializedsource
protected boolean
Whether the config property has already been configured with defaults
false
© 2005–2016 The Cake Software Foundation, Inc.
Licensed under the MIT License.
CakePHP is a registered trademark of Cake Software Foundation, Inc.
We are not endorsed by or affiliated with CakePHP.
http://api.cakephp.org/3.1/class-Cake.Routing.DispatcherFilter.html