Source: lib/net/networking_utils.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  7. goog.provide('shaka.net.NetworkingUtils');
  9. goog.require('goog.Uri');
  10. goog.require('shaka.net.NetworkingEngine');
  13. /**
  14.  * @summary Networking utility functions.
  15.  */
  16. shaka.net.NetworkingUtils = class {
  17.   /**
  18.    * @param {string} uri
  19.    * @param {!shaka.net.NetworkingEngine} netEngine
  20.    * @param {shaka.extern.RetryParameters} retryParams
  21.    * @return {!Promise.<string>}
  22.    */
  23.   static async getMimeType(uri, netEngine, retryParams) {
  24.     const extension = shaka.net.NetworkingUtils.getExtension_(uri);
  25.     let mimeType =
  26.         shaka.net.NetworkingUtils.EXTENSIONS_TO_MIME_TYPES_[extension];
  27.     if (mimeType) {
  28.       return mimeType;
  29.     }
  30.     const type = shaka.net.NetworkingEngine.RequestType.MANIFEST;
  32.     const request = shaka.net.NetworkingEngine.makeRequest([uri], retryParams);
  33.     request.method = 'HEAD';
  35.     const response = await netEngine.request(type, request).promise;
  37.     // https://bit.ly/2K9s9kf says this header should always be available,
  38.     // but just to be safe:
  39.     mimeType = response.headers['content-type'];
  40.     return mimeType ? mimeType.toLowerCase().split(';').shift() : '';
  41.   }
  44.   /**
  45.    * @param {string} uri
  46.    * @return {string}
  47.    * @private
  48.    */
  49.   static getExtension_(uri) {
  50.     const uriObj = new goog.Uri(uri);
  51.     const uriPieces = uriObj.getPath().split('/');
  52.     const uriFilename = uriPieces.pop();
  53.     const filenamePieces = uriFilename.split('.');
  55.     // Only one piece means there is no extension.
  56.     if (filenamePieces.length == 1) {
  57.       return '';
  58.     }
  60.     return filenamePieces.pop().toLowerCase();
  61.   }
  62. };
  64. /**
  65.  * @const {!Object.<string, string>}
  66.  * @private
  67.  */
  68. shaka.net.NetworkingUtils.EXTENSIONS_TO_MIME_TYPES_ = {
  69.   'mp4': 'video/mp4',
  70.   'm4v': 'video/mp4',
  71.   'm4a': 'audio/mp4',
  72.   'webm': 'video/webm',
  73.   'weba': 'audio/webm',
  74.   'mkv': 'video/webm', // Chromium browsers supports it.
  75.   'ts': 'video/mp2t',
  76.   'ogv': 'video/ogg',
  77.   'ogg': 'audio/ogg',
  78.   'mpg': 'video/mpeg',
  79.   'mpeg': 'video/mpeg',
  80.   'm3u8': 'application/x-mpegurl',
  81.   'mpd': 'application/dash+xml',
  82.   'ism': 'application/vnd.ms-sstr+xml',
  83.   'mp3': 'audio/mpeg',
  84.   'aac': 'audio/aac',
  85.   'flac': 'audio/flac',
  86.   'wav': 'audio/wav',
  87.   'sbv': 'text/x-subviewer',
  88.   'srt': 'text/srt',
  89.   'vtt': 'text/vtt',
  90.   'webvtt': 'text/vtt',
  91.   'ttml': 'application/ttml+xml',
  92.   'lrc': 'application/x-subtitle-lrc',
  93.   'ssa': 'text/x-ssa',
  94.   'ass': 'text/x-ssa',
  95. };