# Source: streaming/protection/servers/LicenseServer.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.
     */

    /**
     * Defines the public interface for license server implementations supported
     * by the player.
     *
     * Different license servers have different requirements regarding the methods
     * used to request DRM licenses.  Things like request headers, license response
     * formats (for both error and success cases) need to be customized for a
     * specific server implementation
     *
     * License servers handle requests for more than just initial license retrieval.
     * Each API takes a parameter which describes the message type as supported by
     * the Encrypted Media Extensions.
     *
     * @interface
     */

    /**
     * Returns a new or updated license server URL based on the requirements of the
     * license server and possibly from information passed in the CDM license message
     *
     * @function
     * @name LicenseServer#getServerURLFromMessage
     * @param {?string} url the initially established URL (from ProtectionData or initData)
     * @param {ArrayBuffer} message the CDM message which may be needed to generate the license
     * requests URL
     * @param {string} messageType the message type associated with this request.  Supported
     * message types can be found {@link https://w3c.github.io/encrypted-media/#idl-def-MediaKeyMessageType|here}.
     * @returns {string} the URL to use in license requests
     */

    /**
     * Returns the HTTP method to be used (i.e. "GET", "POST", etc.) in
     * XMLHttpRequest.open().
     *
     * @function
     * @name LicenseServer#getHTTPMethod
     * @param {string} messageType the message type associated with this request.  Supported
     * message types can be found {@link https://w3c.github.io/encrypted-media/#idl-def-MediaKeyMessageType|here}.
     * @returns {string} the HTTP method
     */

    /**
     * Returns the response type to set for XMLHttpRequest.responseType
     *
     * @function
     * @name LicenseServer#getResponseType
     * @param {string} keySystemStr the key system string representing the key system
     * associated with a license request.  Multi-DRM license servers may have different
     * response types depending on the key system.
     * @param {string} messageType the message type associated with this request.  Supported
     * message types can be found {@link https://w3c.github.io/encrypted-media/#idl-def-MediaKeyMessageType|here}.
     * @returns {string} the response type
     */

    /**
     * Parses the license server response for any message intended for
     * the CDM.
     *
     * @function
     * @name LicenseServer#getLicenseMessage
     * @param {Object} serverResponse the response as returned in XMLHttpRequest.response
     * @param {string} keySystemStr the key system string representing the key system
     * associated with a license request.
     * @param {string} messageType the message type associated with this request.  Supported
     * message types can be found {@link https://w3c.github.io/encrypted-media/#idl-def-MediaKeyMessageType|here}.
     * @returns {ArrayBuffer} message that will be sent to the CDM or null if no CDM message
     * was present in the response.
     */

    /**
     * Parses the license server response during error conditions and returns a
     * string to display for debugging purposes
     *
     * @function
     * @name LicenseServer#getErrorResponse
     * @param {Object} serverResponse the server response
     * @param {string} messageType the message type associated with this request.  Supported
     * message types can be found {@link https://w3c.github.io/encrypted-media/#idl-def-MediaKeyMessageType|here}.
     * @returns {string} an error message that indicates the reason for the failure
     */

#### Search results