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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2008 Bharat Mediratta
*
* 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.
*/
/**
* This abstract controller makes it easy to create a RESTful controller. To use it, create a
* subclass which defines the resource type and implements get/post/put/delete methods, like this:
*
* class Comment_Controller extends REST_Controller {
* protected $resource_type = "comment"; // this tells REST which model to use
*
* public function _index() {
* // Handle GET request to /controller
* }
*
* public function _show(ORM $comment) {
* // Handle GET request to /comments/{comment_id}
* }
*
* public function _update(ORM $comment) {
* // Handle PUT request to /comments/{comment_id}
* }
*
* public function _create(ORM $comment) {
* // Handle POST request to /comments
* }
*
* public function _delete(ORM $comment) {
* // Handle DELETE request to /comments/{comments_id}
* }
*
* public function _form_add($parameters) {
* // Handle GET request to /form/add/comments
* // Show a form for creating a new comment
* }
*
* public function _form_edit(ORM $comment) {
* // Handle GET request to /form/edit/comments
* // Show a form for editing an existing comment
* }
*
* A request to http://example.com/gallery3/comments/3 will result in a call to
* REST_Controller::dispatch(3) which will load up the comment associated with id 3. If there's
* no such comment, it returns a 404. Otherwise, it will then delegate to
* Comment_Controller::get() with the ORM instance as an argument.
*/
abstract class REST_Controller extends Controller {
protected $resource_type = null;
public function __construct() {
if ($this->resource_type == null) {
throw new Exception("@todo ERROR_MISSING_RESOURCE_TYPE");
}
parent::__construct();
}
/**
* Handle dispatching for all REST controllers.
*/
public function __call($function, $args) {
// If no parameter was provided after the controller name (eg "/albums") then $function will
// be set to "index". Otherwise, $function is the first parameter, and $args are all
// subsequent parameters.
$request_method = rest::request_method();
if ($function == "index" && $request_method == "get") {
return $this->_index();
}
// @todo this needs security checks
$id = $function;
$resource = ORM::factory($this->resource_type, $id);
if (!$resource->loaded && $request_method == "post") {
return Kohana::show_404();
}
switch ($request_method) {
case "get":
$this->_show($resource);
if (Session::instance()->get("use_profiler", false)) {
$profiler = new Profiler();
$profiler->render();
}
return;
case "put":
return $this->_update($resource);
case "delete":
return $this->_delete($resource);
case "post":
return $this->_create($resource);
}
}
/* We're editing an existing item, load it from the database. */
public function form_edit($resource_id) {
if ($this->resource_type == null) {
throw new Exception("@todo ERROR_MISSING_RESOURCE_TYPE");
}
// @todo this needs security checks
$resource = ORM::factory($this->resource_type, $resource_id);
if (!$resource->loaded) {
return Kohana::show_404();
}
return $this->_form_edit($resource);
}
/* We're adding a new item, pass along any additional parameters. */
public function form_add($parameters) {
return $this->_form_add($parameters);
}
/**
* Perform a GET request on the controller root
* (e.g. http://www.example.com/gallery3/comments)
*/
abstract public function _index();
/**
* Perform a POST request on this resource
* @param ORM $resource the instance of this resource type
*/
abstract public function _create($resource);
/**
* Perform a GET request on this resource
* @param ORM $resource the instance of this resource type
*/
abstract public function _show($resource);
/**
* Perform a PUT request on this resource
* @param ORM $resource the instance of this resource type
*/
abstract public function _update($resource);
/**
* Perform a DELETE request on this resource
* @param ORM $resource the instance of this resource type
*/
abstract public function _delete($resource);
/**
* Present a form for adding a new resource
* @param string part of the URI after the controller name
*/
abstract public function _form_add($parameter);
/**
* Present a form for editing an existing resource
* @param ORM $resource the resource container for instances of this resource type
*/
abstract public function _form_edit($resource);
}
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