mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-17 16:26:39 +03:00
Jacob Trimble
dc8b007d56
This is a port of the internal changes: cr/321495405, cr/321592702, and cr/321594488. Change-Id: If6a4c4266ed10a70b01442974dbd19329bb5122e
110 lines
3.3 KiB
JavaScript
110 lines
3.3 KiB
JavaScript
/*! @license
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* Shaka Player
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* Copyright 2016 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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goog.provide('shaka.util.FairPlayUtils');
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goog.require('goog.Uri');
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goog.require('goog.asserts');
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goog.require('shaka.util.BufferUtils');
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goog.require('shaka.util.Error');
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goog.require('shaka.util.StringUtils');
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/**
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* @summary A set of FairPlay utility functions.
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* @export
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*/
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shaka.util.FairPlayUtils = class {
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/**
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* Using the default method, extract a content ID from the init data. This is
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* based on the FairPlay example documentation.
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*
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* @param {!BufferSource} initData
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* @return {string}
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* @export
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*/
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static defaultGetContentId(initData) {
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const uriString = shaka.util.StringUtils.fromBytesAutoDetect(initData);
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// The domain of that URI is the content ID according to Apple's FPS
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// sample.
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const uri = new goog.Uri(uriString);
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return uri.getDomain();
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}
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/**
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* Transforms the init data buffer using the given data. The format is:
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*
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* <pre>
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* [4 bytes] initDataSize
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* [initDataSize bytes] initData
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* [4 bytes] contentIdSize
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* [contentIdSize bytes] contentId
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* [4 bytes] certSize
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* [certSize bytes] cert
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* </pre>
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*
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* @param {!BufferSource} initData
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* @param {!BufferSource|string} contentId
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* @param {?BufferSource} cert The server certificate; this will throw if not
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* provided.
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* @return {!Uint8Array}
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* @export
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*/
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static initDataTransform(initData, contentId, cert) {
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if (!cert || !cert.byteLength) {
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throw new shaka.util.Error(
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shaka.util.Error.Severity.CRITICAL,
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shaka.util.Error.Category.DRM,
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shaka.util.Error.Code.SERVER_CERTIFICATE_REQUIRED);
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}
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// From that, we build a new init data to use in the session. This is
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// composed of several parts. First, the init data as a UTF-16 sdk:// URL.
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// Second, a 4-byte LE length followed by the content ID in UTF-16-LE.
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// Third, a 4-byte LE length followed by the certificate.
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/** @type {BufferSource} */
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let contentIdArray;
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if (typeof contentId == 'string') {
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contentIdArray =
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shaka.util.StringUtils.toUTF16(contentId, /* littleEndian= */ true);
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} else {
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contentIdArray = contentId;
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}
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// The init data we get is a UTF-8 string; convert that to a UTF-16 string.
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const sdkUri = shaka.util.StringUtils.fromBytesAutoDetect(initData);
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const utf16 =
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shaka.util.StringUtils.toUTF16(sdkUri, /* littleEndian= */ true);
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const rebuiltInitData = new Uint8Array(
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12 + utf16.byteLength + contentIdArray.byteLength + cert.byteLength);
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let offset = 0;
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/** @param {BufferSource} array */
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const append = (array) => {
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rebuiltInitData.set(shaka.util.BufferUtils.toUint8(array), offset);
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offset += array.byteLength;
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};
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/** @param {BufferSource} array */
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const appendWithLength = (array) => {
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const view = shaka.util.BufferUtils.toDataView(rebuiltInitData);
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const value = array.byteLength;
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view.setUint32(offset, value, /* littleEndian= */ true);
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offset += 4;
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append(array);
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};
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appendWithLength(utf16);
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appendWithLength(contentIdArray);
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appendWithLength(cert);
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goog.asserts.assert(
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offset == rebuiltInitData.length, 'Inconsistent init data length');
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return rebuiltInitData;
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}
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};
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