feat(net): Add shaka.net.NetworkingUtils (#5756)

Author: avelad

build/types/core

@@ -46,6 +46,7 @@
 
 +../../lib/net/backoff.js
 +../../lib/net/networking_engine.js
++../../lib/net/networking_utils.js
 
 +../../lib/player.js
 

lib/media/manifest_parser.js

@@ -9,6 +9,7 @@ goog.provide('shaka.media.ManifestParser');
 goog.require('goog.Uri');
 goog.require('shaka.log');
 goog.require('shaka.net.NetworkingEngine');
+goog.require('shaka.net.NetworkingUtils');
 goog.require('shaka.util.Error');
 goog.require('shaka.util.Platform');
 
@@ -159,7 +160,8 @@ shaka.media.ManifestParser = class {
     }
 
     if (!mimeType) {
-      mimeType = await ManifestParser.getMimeType(uri, netEngine, retryParams);
+      mimeType = await shaka.net.NetworkingUtils.getMimeType(
+          uri, netEngine, retryParams);
 
       if (mimeType) {
         const factory = shaka.media.ManifestParser.parsersByMime[mimeType];
@@ -180,27 +182,6 @@ shaka.media.ManifestParser = class {
   }
 
 
-  /**
-   * @param {string} uri
-   * @param {!shaka.net.NetworkingEngine} netEngine
-   * @param {shaka.extern.RetryParameters} retryParams
-   * @return {!Promise.<string>}
-   */
-  static async getMimeType(uri, netEngine, retryParams) {
-    const type = shaka.net.NetworkingEngine.RequestType.MANIFEST;
-
-    const request = shaka.net.NetworkingEngine.makeRequest([uri], retryParams);
-    request.method = 'HEAD';
-
-    const response = await netEngine.request(type, request).promise;
-
-    // https://bit.ly/2K9s9kf says this header should always be available,
-    // but just to be safe:
-    const mimeType = response.headers['content-type'];
-    return mimeType ? mimeType.toLowerCase().split(';').shift() : '';
-  }
-
-
   /**
    * @param {string} uri
    * @return {string}

lib/net/networking_utils.js

@@ -0,0 +1,35 @@
+/*! @license
+ * Shaka Player
+ * Copyright 2016 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+goog.provide('shaka.net.NetworkingUtils');
+
+goog.require('shaka.net.NetworkingEngine');
+
+
+/**
+ * @summary Networking utility functions.
+ */
+shaka.net.NetworkingUtils = class {
+  /**
+   * @param {string} uri
+   * @param {!shaka.net.NetworkingEngine} netEngine
+   * @param {shaka.extern.RetryParameters} retryParams
+   * @return {!Promise.<string>}
+   */
+  static async getMimeType(uri, netEngine, retryParams) {
+    const type = shaka.net.NetworkingEngine.RequestType.MANIFEST;
+
+    const request = shaka.net.NetworkingEngine.makeRequest([uri], retryParams);
+    request.method = 'HEAD';
+
+    const response = await netEngine.request(type, request).promise;
+
+    // https://bit.ly/2K9s9kf says this header should always be available,
+    // but just to be safe:
+    const mimeType = response.headers['content-type'];
+    return mimeType ? mimeType.toLowerCase().split(';').shift() : '';
+  }
+};

lib/player.js

@@ -31,6 +31,7 @@ goog.require('shaka.media.SrcEqualsPlayhead');
 goog.require('shaka.media.StreamingEngine');
 goog.require('shaka.media.TimeRangesUtils');
 goog.require('shaka.net.NetworkingEngine');
+goog.require('shaka.net.NetworkingUtils');
 goog.require('shaka.routing.Walker');
 goog.require('shaka.text.SimpleTextDisplayer');
 goog.require('shaka.text.TextEngine');
@@ -5151,7 +5152,7 @@ shaka.Player = class extends shaka.util.FakeEventTarget {
       goog.asserts.assert(
           this.networkingEngine_, 'Need networking engine.');
       // eslint-disable-next-line require-atomic-updates
-      mimeType = await shaka.media.ManifestParser.getMimeType(uri,
+      mimeType = await shaka.net.NetworkingUtils.getMimeType(uri,
           this.networkingEngine_,
           this.config_.streaming.retryParameters);
     } catch (error) {}

test/media/manifest_parser_unit.js test/net/networking_utils_unit.jstest/media/manifest_parser_unit.js renamed to test/net/networking_utils_unit.js

@@ -7,13 +7,13 @@
 const testGetMimeType = async (expertedMimeType, contentType) => {
   const netEngine = new shaka.test.FakeNetworkingEngine()
       .setHeaders('dummy://foo', {'content-type': contentType});
-  const mimeType = await shaka.media.ManifestParser
+  const mimeType = await shaka.net.NetworkingUtils
       .getMimeType('dummy://foo', netEngine,
           shaka.net.NetworkingEngine.defaultRetryParameters());
   expect(mimeType).toBe(expertedMimeType);
 };
 
-describe('ManifestParser', () => {
+describe('NetworkingUtils', () => {
   describe('getMimeType', () => {
     it('test correct mimeType', () => {
       testGetMimeType('application/dash+xml', 'application/dash+xml');