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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. */ const LICENSE_SERVER_MANIFEST_CONFIGURATIONS = { attributes: ['Laurl', 'laurl'], prefixes: ['clearkey', 'dashif'] }; /** * @class * @ignore */ class CommonEncryption { /** * Find and return the ContentProtection element in the given array * that indicates support for MPEG Common Encryption * * @param {Array} cpArray array of content protection elements * @returns {Object|null} the Common Encryption content protection element or * null if one was not found */ static findCencContentProtection(cpArray) { let retVal = null; for (let i = 0; i < cpArray.length; ++i) { let cp = cpArray[i]; if (cp.schemeIdUri.toLowerCase() === 'urn:mpeg:dash:mp4protection:2011' && (cp.value.toLowerCase() === 'cenc' || cp.value.toLowerCase() === 'cbcs')) retVal = cp; } return retVal; } /** * Returns just the data portion of a single PSSH * * @param {ArrayBuffer} pssh - the PSSH * @return {ArrayBuffer} data portion of the PSSH */ static getPSSHData(pssh) { let offset = 8; // Box size and type fields let view = new DataView(pssh); // Read version let version = view.getUint8(offset); offset += 20; // Version (1), flags (3), system ID (16) if (version > 0) { offset += 4 + (16 * view.getUint32(offset)); // Key ID count (4) and All key IDs (16*count) } offset += 4; // Data size return pssh.slice(offset); } /** * Returns the PSSH associated with the given key system from the concatenated * list of PSSH boxes in the given initData * * @param {KeySystem} keySystem the desired * key system * @param {ArrayBuffer} initData 'cenc' initialization data. Concatenated list of PSSH. * @returns {ArrayBuffer|null} The PSSH box data corresponding to the given key system, null if not found * or null if a valid association could not be found. */ static getPSSHForKeySystem(keySystem, initData) { let psshList = CommonEncryption.parsePSSHList(initData); if (keySystem && psshList.hasOwnProperty(keySystem.uuid.toLowerCase())) { return psshList[keySystem.uuid.toLowerCase()]; } return null; } /** * Parse a standard common encryption PSSH which contains a simple * base64-encoding of the init data * * @param {Object} cpData the ContentProtection element * @param {BASE64} BASE64 reference * @returns {ArrayBuffer|null} the init data or null if not found */ static parseInitDataFromContentProtection(cpData, BASE64) { if ('pssh' in cpData) { // Remove whitespaces and newlines from pssh text cpData.pssh.__text = cpData.pssh.__text.replace(/\r?\n|\r/g, '').replace(/\s+/g, ''); return BASE64.decodeArray(cpData.pssh.__text).buffer; } return null; } /** * Parses list of PSSH boxes into keysystem-specific PSSH data * * @param {ArrayBuffer} data - the concatenated list of PSSH boxes as provided by * CDM as initialization data when CommonEncryption content is detected * @returns {Object|Array} an object that has a property named according to each of * the detected key system UUIDs (e.g. 00000000-0000-0000-0000-0000000000) * and a ArrayBuffer (the entire PSSH box) as the property value */ static parsePSSHList(data) { if (data === null || data === undefined) return []; let dv = new DataView(data.buffer || data); // data.buffer first for Uint8Array support let done = false; let pssh = {}; // TODO: Need to check every data read for end of buffer let byteCursor = 0; while (!done) { let size, nextBox, version, systemID; let boxStart = byteCursor; if (byteCursor >= dv.buffer.byteLength) break; /* Box size */ size = dv.getUint32(byteCursor); nextBox = byteCursor + size; byteCursor += 4; /* Verify PSSH */ if (dv.getUint32(byteCursor) !== 0x70737368) { byteCursor = nextBox; continue; } byteCursor += 4; /* Version must be 0 or 1 */ version = dv.getUint8(byteCursor); if (version !== 0 && version !== 1) { byteCursor = nextBox; continue; } byteCursor++; byteCursor += 3; /* skip flags */ // 16-byte UUID/SystemID systemID = ''; let i, val; for (i = 0; i < 4; i++) { val = dv.getUint8(byteCursor + i).toString(16); systemID += (val.length === 1) ? '0' + val : val; } byteCursor += 4; systemID += '-'; for (i = 0; i < 2; i++) { val = dv.getUint8(byteCursor + i).toString(16); systemID += (val.length === 1) ? '0' + val : val; } byteCursor += 2; systemID += '-'; for (i = 0; i < 2; i++) { val = dv.getUint8(byteCursor + i).toString(16); systemID += (val.length === 1) ? '0' + val : val; } byteCursor += 2; systemID += '-'; for (i = 0; i < 2; i++) { val = dv.getUint8(byteCursor + i).toString(16); systemID += (val.length === 1) ? '0' + val : val; } byteCursor += 2; systemID += '-'; for (i = 0; i < 6; i++) { val = dv.getUint8(byteCursor + i).toString(16); systemID += (val.length === 1) ? '0' + val : val; } byteCursor += 6; systemID = systemID.toLowerCase(); /* PSSH Data Size */ byteCursor += 4; /* PSSH Data */ pssh[systemID] = dv.buffer.slice(boxStart, nextBox); byteCursor = nextBox; } return pssh; } static getLicenseServerUrlFromMediaInfo(mediaInfo, schemeIdUri) { try { if (!mediaInfo || mediaInfo.length === 0) { return null; } let i = 0; let licenseServer = null; while (i < mediaInfo.length && !licenseServer) { const info = mediaInfo[i]; if (info && info.contentProtection && info.contentProtection.length > 0) { const targetProtectionData = info.contentProtection.filter((cp) => { return cp.schemeIdUri && cp.schemeIdUri === schemeIdUri; }); if (targetProtectionData && targetProtectionData.length > 0) { let j = 0; while (j < targetProtectionData.length && !licenseServer) { const ckData = targetProtectionData[j]; let k = 0; while (k < LICENSE_SERVER_MANIFEST_CONFIGURATIONS.attributes.length && !licenseServer) { let l = 0; const attribute = LICENSE_SERVER_MANIFEST_CONFIGURATIONS.attributes[k]; while (l < LICENSE_SERVER_MANIFEST_CONFIGURATIONS.prefixes.length && !licenseServer) { const prefix = LICENSE_SERVER_MANIFEST_CONFIGURATIONS.prefixes[l]; if (ckData[attribute] && ckData[attribute].__prefix && ckData[attribute].__prefix === prefix && ckData[attribute].__text) { licenseServer = ckData[attribute].__text; } l += 1; } k += 1; } j += 1; } } } i += 1; } return licenseServer; } catch (e) { return null; } } } export default CommonEncryption; </code></pre></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div 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