dom/cache/ManagerId.cpp


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

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/dom/cache/ManagerId.h"
#include "mozilla/dom/quota/QuotaManager.h"
#include "nsIPrincipal.h"
#include "nsProxyRelease.h"
#include "mozilla/RefPtr.h"
#include "nsThreadUtils.h"

namespace mozilla {
namespace dom {
namespace cache {

using mozilla::dom::quota::QuotaManager;

// static
nsresult
ManagerId::Create(nsIPrincipal* aPrincipal, ManagerId** aManagerIdOut)
{
  MOZ_ASSERT(NS_IsMainThread());

  // The QuotaManager::GetInfoFromPrincipal() has special logic for system
  // and about: principals.  We need to use the same modified origin in
  // order to interpret calls from QM correctly.
  nsCString quotaOrigin;
  nsresult rv = QuotaManager::GetInfoFromPrincipal(aPrincipal,
                                                   nullptr,   // suffix
                                                   nullptr,   // group
                                                   &quotaOrigin,
                                                   nullptr);  // is app
  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }

  RefPtr<ManagerId> ref = new ManagerId(aPrincipal, quotaOrigin);
  ref.forget(aManagerIdOut);

  return NS_OK;
}

already_AddRefed<nsIPrincipal>
ManagerId::Principal() const
{
  MOZ_ASSERT(NS_IsMainThread());
  nsCOMPtr<nsIPrincipal> ref = mPrincipal;
  return ref.forget();
}

ManagerId::ManagerId(nsIPrincipal* aPrincipal, const nsACString& aQuotaOrigin)
    : mPrincipal(aPrincipal)
    , mQuotaOrigin(aQuotaOrigin)
{
  MOZ_DIAGNOSTIC_ASSERT(mPrincipal);
}

ManagerId::~ManagerId()
{
  // If we're already on the main thread, then default destruction is fine
  if (NS_IsMainThread()) {
    return;
  }

  // Otherwise we need to proxy to main thread to do the release

  // The PBackground worker thread shouldn't be running after the main thread
  // is stopped.  So main thread is guaranteed to exist here.
  NS_ReleaseOnMainThread(mPrincipal.forget());
}

} // namespace cache
} // namespace dom
} // namespace mozilla