summaryrefslogtreecommitdiffstats
path: root/dom/broadcastchannel/BroadcastChannelChild.cpp
blob: 5ea19c758a5dcad984dbf754d031893b995c0eee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "BroadcastChannelChild.h"
#include "BroadcastChannel.h"
#include "jsapi.h"
#include "mozilla/dom/ipc/BlobChild.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/MessageEvent.h"
#include "mozilla/dom/MessageEventBinding.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/dom/ipc/StructuredCloneData.h"
#include "WorkerPrivate.h"

namespace mozilla {

using namespace ipc;

namespace dom {

using namespace workers;

BroadcastChannelChild::BroadcastChannelChild(const nsACString& aOrigin)
  : mBC(nullptr)
  , mActorDestroyed(false)
{
  CopyUTF8toUTF16(aOrigin, mOrigin);
}

BroadcastChannelChild::~BroadcastChannelChild()
{
  MOZ_ASSERT(!mBC);
}

bool
BroadcastChannelChild::RecvNotify(const ClonedMessageData& aData)
{
  // Make sure to retrieve all blobs from the message before returning to avoid
  // leaking their actors.
  nsTArray<RefPtr<BlobImpl>> blobs;
  if (!aData.blobsChild().IsEmpty()) {
    blobs.SetCapacity(aData.blobsChild().Length());

    for (uint32_t i = 0, len = aData.blobsChild().Length(); i < len; ++i) {
      RefPtr<BlobImpl> impl =
        static_cast<BlobChild*>(aData.blobsChild()[i])->GetBlobImpl();

      blobs.AppendElement(impl);
    }
  }

  nsCOMPtr<DOMEventTargetHelper> helper = mBC;
  nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(helper);

  // The object is going to be deleted soon. No notify is required.
  if (!eventTarget) {
    return true;
  }

  // CheckInnerWindowCorrectness can be used also without a window when
  // BroadcastChannel is running in a worker. In this case, it's a NOP.
  if (NS_FAILED(mBC->CheckInnerWindowCorrectness())) {
    return true;
  }

  mBC->RemoveDocFromBFCache();

  AutoJSAPI jsapi;
  nsCOMPtr<nsIGlobalObject> globalObject;

  if (NS_IsMainThread()) {
    globalObject = do_QueryInterface(mBC->GetParentObject());
  } else {
    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
    MOZ_ASSERT(workerPrivate);
    globalObject = workerPrivate->GlobalScope();
  }

  if (!globalObject || !jsapi.Init(globalObject)) {
    NS_WARNING("Failed to initialize AutoJSAPI object.");
    return true;
  }

  ipc::StructuredCloneData cloneData;
  cloneData.BlobImpls().AppendElements(blobs);

  const SerializedStructuredCloneBuffer& buffer = aData.data();
  JSContext* cx = jsapi.cx();
  JS::Rooted<JS::Value> value(cx, JS::NullValue());
  if (buffer.data.Size()) {
    ErrorResult rv;
    cloneData.UseExternalData(buffer.data);
    cloneData.Read(cx, &value, rv);
    if (NS_WARN_IF(rv.Failed())) {
      rv.SuppressException();
      return true;
    }
  }

  RootedDictionary<MessageEventInit> init(cx);
  init.mBubbles = false;
  init.mCancelable = false;
  init.mOrigin = mOrigin;
  init.mData = value;

  ErrorResult rv;
  RefPtr<MessageEvent> event =
    MessageEvent::Constructor(mBC, NS_LITERAL_STRING("message"), init, rv);
  if (NS_WARN_IF(rv.Failed())) {
    rv.SuppressException();
    return true;
  }

  event->SetTrusted(true);

  bool status;
  mBC->DispatchEvent(static_cast<Event*>(event.get()), &status);

  return true;
}

void
BroadcastChannelChild::ActorDestroy(ActorDestroyReason aWhy)
{
  mActorDestroyed = true;
}

} // namespace dom
} // namespace mozilla