@l5i/dashjs/src/streaming/protection/servers/ClearKey.js

A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.

/**
 * The copyright in this software is being made available under the BSD License,
 * included below. This software may be subject to other third party and contributor
 * rights, including patent rights, and no such rights are granted under this license.
 *
 * Copyright (c) 2013, Dash Industry Forum.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *  * Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation and/or
 *  other materials provided with the distribution.
 *  * Neither the name of Dash Industry Forum nor the names of its
 *  contributors may be used to endorse or promote products derived from this software
 *  without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
 *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * CableLabs ClearKey license server implementation
 *
 * For testing purposes and evaluating potential uses for ClearKey, we have developed
 * a dirt-simple API for requesting ClearKey licenses from a remote server.
 *
 * @implements LicenseServer
 * @class
 */
import KeyPair from '../vo/KeyPair';
import ClearKeyKeySet from '../vo/ClearKeyKeySet';

function ClearKey() {

    let instance;

    function getServerURLFromMessage(url, message/*, messageType*/) {
        // Build ClearKey server query string
        const jsonMsg = JSON.parse(String.fromCharCode.apply(null, new Uint8Array(message)));
        url += '/?';
        for (let i = 0; i < jsonMsg.kids.length; i++) {
            url += jsonMsg.kids[i] + '&';
        }
        url = url.substring(0, url.length - 1);
        return url;
    }

    function getHTTPMethod(/*messageType*/) {
        return 'GET';
    }

    function getResponseType(/*keySystemStr*/) {
        return 'json';
    }

    function getLicenseMessage(serverResponse/*, keySystemStr, messageType*/) {
        if (!serverResponse.hasOwnProperty('keys')) {
            return null;
        }
        let keyPairs = [];
        for (let i = 0; i < serverResponse.keys.length; i++) {
            let keypair = serverResponse.keys[i];
            let keyid = keypair.kid.replace(/=/g, '');
            let key = keypair.k.replace(/=/g, '');

            keyPairs.push(new KeyPair(keyid, key));
        }
        return new ClearKeyKeySet(keyPairs);
    }

    function getErrorResponse(serverResponse/*, keySystemStr, messageType*/) {
        return String.fromCharCode.apply(null, new Uint8Array(serverResponse));
    }

    instance = {
        getServerURLFromMessage: getServerURLFromMessage,
        getHTTPMethod: getHTTPMethod,
        getResponseType: getResponseType,
        getLicenseMessage: getLicenseMessage,
        getErrorResponse: getErrorResponse
    };

    return instance;
}

ClearKey.__dashjs_factory_name = 'ClearKey';
export default dashjs.FactoryMaker.getSingletonFactory(ClearKey); /* jshint ignore:line */