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<?php
/**
* Base class for authentication processing filters.
*
* All authentication processing filters must support serialization.
*
* The current request is stored in an associative array. It has the following defined attributes:
* - 'Attributes' The attributes of the user.
* - 'Destination' Metadata of the destination (SP).
* - 'Source' Metadata of the source (IdP).
*
* It may also contain other attributes. If an authentication processing filter wishes to store other
* information in it, it should have a name on the form 'module:filter:attributename', to avoid name
* collisions.
*
* @author Olav Morken, UNINETT AS.
* @package simpleSAMLphp
*/
abstract class SimpleSAML_Auth_ProcessingFilter {
/**
* Priority of this filter.
*
* Used when merging IdP and SP processing chains.
* The priority can be any integer. The default for most filters is 50. Filters may however
* specify their own default, if they typically should be amongst the first or the last filters.
*
* The prioroty can also be overridden by the user by specifying the '%priority' option.
*/
public $priority = 50;
/**
* Constructor for a processing filter.
*
* Any processing filter which implements its own constructor must call this
* constructor first.
*
* @param array &$config Configuration for this filter.
* @param mixed $reserved For future use.
*/
public function __construct(&$config, $reserved) {
assert('is_array($config)');
if(array_key_exists('%priority', $config)) {
$this->priority = $config['%priority'];
if(!is_int($this->priority)) {
throw new Exception('Invalid priority: ' . var_export($this->priority, TRUE));
}
unset($config['%priority']);
}
}
/**
* Process a request.
*
* When a filter returns from this function, it is assumed to have completed its task.
*
* @param array &$request The request we are currently processing.
*/
abstract public function process(&$request);
}
?>
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