# Source: streaming/protection/vo/ClearKeyKeySet.js

    /**
     * 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.
     */

    /**
     * @classdesc A collection of ClearKey encryption keys with an (optional) associated
     *  type
     * @ignore
     */
    class ClearKeyKeySet {
        /**
         * @param {Array.<KeyPair>} keyPairs
         * @param {string} type the type of keys in this set.  One of either 'persistent'
         * or 'temporary'.  Can also be null or undefined.
         * @class
         * @ignore
         */
        constructor(keyPairs, type) {
            if (type && type !== 'persistent' && type !== 'temporary')
                throw new Error('Invalid ClearKey key set type!  Must be one of \'persistent\' or \'temporary\'');
            this.keyPairs = keyPairs;
            this.type = type;
        }

        /**
         * Convert this key set to its JSON Web Key (JWK) representation
         *
         * @return {ArrayBuffer} JWK object UTF-8 encoded as ArrayBuffer
         */
        toJWK() {
            let i;
            let numKeys = this.keyPairs.length;
            let jwk = {keys: []};

            for (i = 0; i < numKeys; i++) {
                let key = {
                    kty: 'oct',
                    alg: 'A128KW',
                    kid: this.keyPairs[i].keyID,
                    k: this.keyPairs[i].key
                };
                jwk.keys.push(key);
            }
            if (this.type) {
                jwk.type = this.type;
            }
            let jwkString = JSON.stringify(jwk);
            const len = jwkString.length;

            // Convert JSON string to ArrayBuffer
            let buf = new ArrayBuffer(len);
            let bView = new Uint8Array(buf);
            for (i = 0; i < len; i++)
                bView[i] = jwkString.charCodeAt(i);
            return buf;
        }
    }

    export default ClearKeyKeySet;

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