blob: 7eee386af72b139926d685872a86bef6d52fc7c3 (
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
|
/* -*- 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 "PermissionObserver.h"
#include "mozilla/dom/PermissionStatus.h"
#include "mozilla/Services.h"
#include "mozilla/UniquePtr.h"
#include "nsIObserverService.h"
#include "nsIPermission.h"
#include "PermissionUtils.h"
namespace mozilla {
namespace dom {
namespace {
PermissionObserver* gInstance = nullptr;
} // namespace
NS_IMPL_ISUPPORTS(PermissionObserver,
nsIObserver,
nsISupportsWeakReference)
PermissionObserver::PermissionObserver()
{
MOZ_ASSERT(!gInstance);
}
PermissionObserver::~PermissionObserver()
{
MOZ_ASSERT(mSinks.IsEmpty());
MOZ_ASSERT(gInstance == this);
gInstance = nullptr;
}
/* static */ already_AddRefed<PermissionObserver>
PermissionObserver::GetInstance()
{
RefPtr<PermissionObserver> instance = gInstance;
if (!instance) {
instance = new PermissionObserver();
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (NS_WARN_IF(!obs)) {
return nullptr;
}
nsresult rv = obs->AddObserver(instance, "perm-changed", true);
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
gInstance = instance;
}
return instance.forget();
}
void
PermissionObserver::AddSink(PermissionStatus* aSink)
{
MOZ_ASSERT(aSink);
MOZ_ASSERT(!mSinks.Contains(aSink));
mSinks.AppendElement(aSink);
}
void
PermissionObserver::RemoveSink(PermissionStatus* aSink)
{
MOZ_ASSERT(aSink);
MOZ_ASSERT(mSinks.Contains(aSink));
mSinks.RemoveElement(aSink);
}
void
PermissionObserver::Notify(PermissionName aName, nsIPrincipal& aPrincipal)
{
for (auto* sink : mSinks) {
if (sink->mName != aName) {
continue;
}
nsCOMPtr<nsIPrincipal> sinkPrincipal = sink->GetPrincipal();
if (NS_WARN_IF(!sinkPrincipal) || !aPrincipal.Equals(sinkPrincipal)) {
continue;
}
sink->PermissionChanged();
}
}
NS_IMETHODIMP
PermissionObserver::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
MOZ_ASSERT(!strcmp(aTopic, "perm-changed"));
if (mSinks.IsEmpty()) {
return NS_OK;
}
nsCOMPtr<nsIPermission> perm = do_QueryInterface(aSubject);
if (!perm) {
return NS_OK;
}
nsCOMPtr<nsIPrincipal> principal;
perm->GetPrincipal(getter_AddRefs(principal));
if (!principal) {
return NS_OK;
}
nsAutoCString type;
perm->GetType(type);
Maybe<PermissionName> permission = TypeToPermissionName(type.get());
if (permission) {
Notify(permission.value(), *principal);
}
return NS_OK;
}
} // namespace dom
} // namespace mozilla
|
