<?php
// This file is part of BasicLTI4Moodle
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
//
// BasicLTI4Moodle is an IMS BasicLTI (Basic Learning Tools for Interoperability)
// consumer for Moodle 1.9 and Moodle 2.0. BasicLTI is a IMS Standard that allows web
// based learning tools to be easily integrated in LMS as native ones. The IMS BasicLTI
// specification is part of the IMS standard Common Cartridge 1.1 Sakai and other main LMS
// are already supporting or going to support BasicLTI. This project Implements the consumer
// for Moodle. Moodle is a Free Open source Learning Management System by Martin Dougiamas.
// BasicLTI4Moodle is a project iniciated and leaded by Ludo(Marc Alier) and Jordi Piguillem
// at the GESSI research group at UPC.
// SimpleLTI consumer for Moodle is an implementation of the early specification of LTI
// by Charles Severance (Dr Chuck) htp://dr-chuck.com , developed by Jordi Piguillem in a
// Google Summer of Code 2008 project co-mentored by Charles Severance and Marc Alier.
//
// BasicLTI4Moodle is copyright 2009 by Marc Alier Forment, Jordi Piguillem and Nikolas Galanis
// of the Universitat Politecnica de Catalunya http://www.upc.edu
// Contact info: Marc Alier Forment granludo @ gmail.com or marc.alier @ upc.edu
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.

/**
 * This file contains a Trivial memory-based store - no support for tokens
 *
 * @package lti
 * @copyright IMS Global Learning Consortium
 *
 * @author Charles Severance csev@umich.edu
 *
 * @license http://www.apache.org/licenses/LICENSE-2.0
 */

namespace moodle\mod\lti;//Using a namespace as the basicLTI module imports classes with the same names

defined('MOODLE_INTERNAL') || die;

/**
 * A Trivial memory-based store - no support for tokens
 */
class TrivialOAuthDataStore extends OAuthDataStore {
    private $consumers = array();

    function add_consumer($consumer_key, $consumer_secret) {
        $this->consumers[$consumer_key] = $consumer_secret;
    }

    function lookup_consumer($consumer_key) {
        if ( strpos($consumer_key, "http://" ) === 0 ) {
            $consumer = new OAuthConsumer($consumer_key, "secret", null);
            return $consumer;
        }
        if ( $this->consumers[$consumer_key] ) {
            $consumer = new OAuthConsumer($consumer_key, $this->consumers[$consumer_key], null);
            return $consumer;
        }
        return null;
    }

    function lookup_token($consumer, $token_type, $token) {
        return new OAuthToken($consumer, "");
    }

    // Return NULL if the nonce has not been used
    // Return $nonce if the nonce was previously used
    function lookup_nonce($consumer, $token, $nonce, $timestamp) {
        // Should add some clever logic to keep nonces from
        // being reused - for no we are really trusting
        // that the timestamp will save us
        return null;
    }

    function new_request_token($consumer) {
        return null;
    }

    function new_access_token($token, $consumer) {
        return null;
    }
}