Add a polyfill for EME encryption scheme queries

Note that the encryptionScheme field isn't being used by Shaka Player
yet, but that this will enable us to experiment with it ahead of the
full launch of the feature in browsers.

See also:
 - https://wicg.github.io/encrypted-media-encryption-scheme/
 - WICG/encrypted-media-encryption-scheme#13
 - w3c/encrypted-media#457

Change-Id: I9e8c2b6ce4ce3f4fe634fa4164669c69959e7fde

build/build.py

@@ -276,7 +276,10 @@ def build_library(self, name, locales, force, is_debug):
 
     build_name = 'shaka-player.' + name
     closure = compiler.ClosureCompiler(self.include, build_name)
-    generator = compiler.ExternGenerator(self.include, build_name)
+
+    # Don't pass node modules to the extern generator.
+    local_include = set([f for f in self.include if 'node_modules' not in f])
+    generator = compiler.ExternGenerator(local_include, build_name)
 
     closure_opts = common_closure_opts + common_closure_defines
     if is_debug:

build/check.py

@@ -32,6 +32,17 @@
 import shakaBuildHelpers
 
 
+def complete_build_files():
+  """Returns a complete set of build files."""
+  complete = build.Build()
+  # Normally we don't need to include @core, but because we look at the build
+  # object directly, we need to include it here.  When using main(), it will
+  # call addCore which will ensure core is included.
+  if not complete.parse_build(['+@complete', '+@core'], os.getcwd()):
+    logging.error('Error parsing complete build')
+    return False
+  return complete.include
+
 def get_lint_files():
   """Returns the absolute paths to all the files to run the linter over."""
   match = re.compile(r'.*\.js$')
@@ -94,20 +105,18 @@ def check_complete(_):
   """
   logging.info('Checking that the build files are complete...')
 
-  complete = build.Build()
-  # Normally we don't need to include @core, but because we look at the build
-  # object directly, we need to include it here.  When using main(), it will
-  # call addCore which will ensure core is included.
-  if not complete.parse_build(['+@complete', '+@core'], os.getcwd()):
-    logging.error('Error parsing complete build')
+  complete_build = complete_build_files()
+  if not complete_build:
     return False
 
   match = re.compile(r'.*\.js$')
   base = shakaBuildHelpers.get_source_base()
   all_files = set()
-  all_files.update(shakaBuildHelpers.get_all_files(os.path.join(base, 'lib'), match))
-  all_files.update(shakaBuildHelpers.get_all_files(os.path.join(base, 'ui'), match))
-  missing_files = all_files - complete.include
+  all_files.update(shakaBuildHelpers.get_all_files(
+      os.path.join(base, 'lib'), match))
+  all_files.update(shakaBuildHelpers.get_all_files(
+      os.path.join(base, 'ui'), match))
+  missing_files = all_files - complete_build
 
   if missing_files:
     logging.error('There are files missing from the complete build:')
@@ -126,14 +135,19 @@ def check_tests(args):
   """
   logging.info('Checking the tests for type errors...')
 
+  complete_build = complete_build_files()
+  if not complete_build:
+    return False
+
   match = re.compile(r'.*\.js$')
   base = shakaBuildHelpers.get_source_base()
   def get(*path_components):
     return shakaBuildHelpers.get_all_files(
         os.path.join(base, *path_components), match)
-  files = set(get('lib') + get('externs') + get('test') + get('ui') +
-              get('third_party', 'closure') +
-              get('third_party', 'language-mapping-list'))
+
+  files = complete_build
+  files.update(set(get('externs') + get('test') +
+                   get('third_party', 'closure')))
   files.add(os.path.join(base, 'demo', 'common', 'asset.js'))
   files.add(os.path.join(base, 'demo', 'common', 'assets.js'))
 

build/conformance.textproto

@@ -81,6 +81,7 @@ requirement {
   whitelist_regexp: 'demo/'
   whitelist_regexp: 'third_party/closure/'
   whitelist_regexp: 'test/'
+  whitelist_regexp: 'node_modules/'
 }
 
 
@@ -110,6 +111,7 @@ requirement: {
   whitelist_regexp: 'lib/debug/log.js'
   whitelist_regexp: 'third_party/closure/'
   whitelist_regexp: 'test/test/boot.js'
+  whitelist_regexp: 'node_modules/'
 }
 
 

build/types/polyfill

@@ -1,5 +1,7 @@
 # Polyfills used to emulate missing browsers features.
 
++../../node_modules/eme-encryption-scheme-polyfill/index.js
++../../lib/polyfill/encryption_scheme.js
 +../../lib/polyfill/fullscreen.js
 +../../lib/polyfill/indexed_db.js
 +../../lib/polyfill/input_event.js

demo/index.html

@@ -72,6 +72,8 @@
   '../dist/deps.js',
   // This is required for goog.asserts.
   '../lib/debug/asserts.js',
+  // Compiled into Shaka Player, but outside of the Closure deps system.
+  '../node_modules/eme-encryption-scheme-polyfill/index.js',
   // This file contains goog.require calls for all exported library classes.
   '../shaka-player.uncompiled.js',
   // Enable less, the CSS pre-processor.

karma.conf.js

@@ -83,6 +83,10 @@ module.exports = function(config) {
       // muxjs module next
       'node_modules/mux.js/dist/mux.min.js',
 
+      // EME encryption scheme polyfill, compiled into Shaka Player, but outside
+      // of the Closure deps system.
+      'node_modules/eme-encryption-scheme-polyfill/index.js',
+
       // load closure base, the deps tree, and the uncompiled library
       'third_party/closure/goog/base.js',
       'dist/deps.js',

lib/polyfill/encryption_scheme.js

@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright 2016 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+goog.provide('shaka.polyfill.EncryptionScheme');
+
+goog.require('shaka.polyfill.register');
+
+/**
+ * @summary A polyfill to add support for EncryptionScheme queries in EME.
+ * @see https://wicg.github.io/encrypted-media-encryption-scheme/
+ * @see https://github.com/w3c/encrypted-media/pull/457
+ * @see https://github.com/google/eme-encryption-scheme-polyfill
+ */
+shaka.polyfill.EncryptionScheme = class {
+  /**
+   * Install the polyfill if needed.
+   *
+   * @suppress {missingRequire}
+   */
+  static install() {
+    EmeEncryptionSchemePolyfill.install();
+  }
+};
+
+// Install at a low priority so that other EME polyfills go first.
+shaka.polyfill.register(shaka.polyfill.EncryptionScheme.install, -1);

package.json

@@ -64,5 +64,8 @@
   "license": "Apache-2.0",
   "scripts": {
     "prepublishOnly": "python build/checkversion.py && python build/all.py --force"
+  },
+  "dependencies": {
+    "eme-encryption-scheme-polyfill": "^1.0.0"
   }
 }

shaka-player.uncompiled.js

@@ -42,6 +42,7 @@ goog.require('shaka.offline.OfflineManifestParser');
 goog.require('shaka.offline.OfflineScheme');
 goog.require('shaka.offline.Storage');
 goog.require('shaka.offline.indexeddb.StorageMechanism');
+goog.require('shaka.polyfill.EncryptionScheme');
 goog.require('shaka.polyfill.Fullscreen');
 goog.require('shaka.polyfill.IndexedDB');
 goog.require('shaka.polyfill.InputEvent');