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<?php
/**
* Virtual HTTP service client
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Virtual HTTP service instance that can be mounted on to a VirtualRESTService
*
* Sub-classes manage the logic of either:
* - a) Munging virtual HTTP request arrays to have qualified URLs and auth headers
* - b) Emulating the execution of virtual HTTP requests (e.g. brokering)
*
* Authentication information can be cached in instances of the class for performance.
* Such information should also be cached locally on the server and auth requests should
* have reasonable timeouts.
*
* @since 1.23
*/
abstract class VirtualRESTService {
/** @var array Key/value map */
protected $params = array();
/**
* @param array $params Key/value map
*/
public function __construct( array $params ) {
$this->params = $params;
}
/**
* Return the name of this service, in a form suitable for error
* reporting or debugging.
*
* @return string The name of the service behind this VRS object.
*/
public function getName() {
return isset( $this->params['name'] ) ? $this->params['name'] :
get_class( $this );
}
/**
* Prepare virtual HTTP(S) requests (for this service) for execution
*
* This method should mangle any of the $reqs entry fields as needed:
* - url : munge the URL to have an absolute URL with a protocol
* and encode path components as needed by the backend [required]
* - query : include any authentication signatures/parameters [as needed]
* - headers : include any authentication tokens/headers [as needed]
*
* The incoming URL parameter will be relative to the service mount point.
*
* This method can also remove some of the requests as well as add new ones
* (using $idGenerator to set each of the entries' array keys). For any existing
* or added request, the 'response' array can be filled in, which will prevent the
* client from executing it. If an original request is removed, at some point it
* must be added back (with the same key) in onRequests() or onResponses();
* it's reponse may be filled in as with other requests.
*
* @param array $reqs Map of Virtual HTTP request arrays
* @param Closure $idGeneratorFunc Method to generate unique keys for new requests
* @return array Modified HTTP request array map
*/
public function onRequests( array $reqs, Closure $idGeneratorFunc ) {
$result = array();
foreach ( $reqs as $key => $req ) {
// The default encoding treats the URL as a REST style path that uses
// forward slash as a hierarchical delimiter (and never otherwise).
// Subclasses can override this, and should be documented in any case.
$parts = array_map( 'rawurlencode', explode( '/', $req['url'] ) );
$req['url'] = $this->params['baseUrl'] . '/' . implode( '/', $parts );
$result[$key] = $req;
}
return $result;
}
/**
* Mangle or replace virtual HTTP(S) requests which have been responded to
*
* This method may mangle any of the $reqs entry 'response' fields as needed:
* - code : perform any code normalization [as needed]
* - reason : perform any reason normalization [as needed]
* - headers : perform any header normalization [as needed]
*
* This method can also remove some of the requests as well as add new ones
* (using $idGenerator to set each of the entries' array keys). For any existing
* or added request, the 'response' array can be filled in, which will prevent the
* client from executing it. If an original request is removed, at some point it
* must be added back (with the same key) in onRequests() or onResponses();
* it's reponse may be filled in as with other requests. All requests added to $reqs
* will be passed through onRequests() to handle any munging required as normal.
*
* The incoming URL parameter will be relative to the service mount point.
*
* @param array $reqs Map of Virtual HTTP request arrays with 'response' set
* @param Closure $idGeneratorFunc Method to generate unique keys for new requests
* @return array Modified HTTP request array map
*/
public function onResponses( array $reqs, Closure $idGeneratorFunc ) {
return $reqs;
}
}
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