media/blink/webcontentdecryptionmoduleaccess_impl.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/blink/webcontentdecryptionmoduleaccess_impl.h"
   6
   7 #include "base/bind.h"
   8 #include "base/location.h"
   9 #include "base/message_loop/message_loop_proxy.h"
  10 #include "media/blink/webencryptedmediaclient_impl.h"
  11
  12 namespace media {
  13
  14 // The caller owns the created cdm (passed back using |result|).
  15 static void CreateCdm(const base::WeakPtr<WebEncryptedMediaClientImpl>& client,
  16                       const blink::WebString& key_system,
  17                       bool allow_distinctive_identifier,
  18                       bool allow_persistent_state,
  19                       const blink::WebSecurityOrigin& security_origin,
  20                       blink::WebContentDecryptionModuleResult result) {
  21   // If |client| is gone (due to the frame getting destroyed), it is
  22   // impossible to create the CDM, so fail.
  23   if (!client) {
  24     result.completeWithError(
  25         blink::WebContentDecryptionModuleExceptionInvalidStateError, 0,
  26         "Failed to create CDM.");
  27     return;
  28   }
  29
  30   client->CreateCdm(key_system, allow_distinctive_identifier,
  31                     allow_persistent_state, security_origin, result);
  32 }
  33
  34 WebContentDecryptionModuleAccessImpl*
  35 WebContentDecryptionModuleAccessImpl::Create(
  36     const blink::WebString& key_system,
  37     const blink::WebMediaKeySystemConfiguration& configuration,
  38     const blink::WebSecurityOrigin& security_origin,
  39     const base::WeakPtr<WebEncryptedMediaClientImpl>& client) {
  40   return new WebContentDecryptionModuleAccessImpl(key_system, configuration,
  41                                                   security_origin, client);
  42 }
  43
  44 WebContentDecryptionModuleAccessImpl::WebContentDecryptionModuleAccessImpl(
  45     const blink::WebString& key_system,
  46     const blink::WebMediaKeySystemConfiguration& configuration,
  47     const blink::WebSecurityOrigin& security_origin,
  48     const base::WeakPtr<WebEncryptedMediaClientImpl>& client)
  49     : key_system_(key_system),
  50       configuration_(configuration),
  51       security_origin_(security_origin),
  52       client_(client) {
  53 }
  54
  55 WebContentDecryptionModuleAccessImpl::~WebContentDecryptionModuleAccessImpl() {
  56 }
  57
  58 blink::WebMediaKeySystemConfiguration
  59 WebContentDecryptionModuleAccessImpl::getConfiguration() {
  60   return configuration_;
  61 }
  62
  63 void WebContentDecryptionModuleAccessImpl::createContentDecryptionModule(
  64     blink::WebContentDecryptionModuleResult result) {
  65   // Convert the accumulated configuration requirements to bools. Accumulated
  66   // configurations never have optional requirements.
  67   DCHECK(configuration_.distinctiveIdentifier !=
  68          blink::WebMediaKeySystemConfiguration::Requirement::Optional);
  69   DCHECK(configuration_.persistentState !=
  70          blink::WebMediaKeySystemConfiguration::Requirement::Optional);
  71   bool allow_distinctive_identifier =
  72       (configuration_.distinctiveIdentifier ==
  73        blink::WebMediaKeySystemConfiguration::Requirement::Required);
  74   bool allow_persistent_state =
  75       (configuration_.persistentState ==
  76        blink::WebMediaKeySystemConfiguration::Requirement::Required);
  77
  78   // This method needs to run asynchronously, as it may need to load the CDM.
  79   // As this object's lifetime is controlled by MediaKeySystemAccess on the
  80   // blink side, copy all values needed by CreateCdm() in case the blink object
  81   // gets garbage-collected.
  82   base::MessageLoopProxy::current()->PostTask(
  83       FROM_HERE,
  84       base::Bind(&CreateCdm, client_, key_system_, allow_distinctive_identifier,
  85                  allow_persistent_state, security_origin_, result));
  86 }
  87
  88 }  // namespace media