dom/permission/PermissionStatus.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/PermissionStatus.h"
   8 #include "mozilla/PermissionDelegateHandler.h"
   9
  10 #include "mozilla/AsyncEventDispatcher.h"
  11 #include "mozilla/Permission.h"
  12 #include "mozilla/Services.h"
  13 #include "nsIPermissionManager.h"
  14 #include "PermissionObserver.h"
  15 #include "PermissionUtils.h"
  16
  17 namespace mozilla::dom {
  18
  19 /* static */
  20 already_AddRefed<PermissionStatus> PermissionStatus::Create(
  21     nsPIDOMWindowInner* aWindow, PermissionName aName, ErrorResult& aRv) {
  22   RefPtr<PermissionStatus> status = new PermissionStatus(aWindow, aName);
  23   aRv = status->Init();
  24   if (NS_WARN_IF(aRv.Failed())) {
  25     return nullptr;
  26   }
  27
  28   return status.forget();
  29 }
  30
  31 PermissionStatus::PermissionStatus(nsPIDOMWindowInner* aWindow,
  32                                    PermissionName aName)
  33     : DOMEventTargetHelper(aWindow),
  34       mName(aName),
  35       mState(PermissionState::Denied) {
  36   KeepAliveIfHasListenersFor(nsGkAtoms::onchange);
  37 }
  38
  39 nsresult PermissionStatus::Init() {
  40   mObserver = PermissionObserver::GetInstance();
  41   if (NS_WARN_IF(!mObserver)) {
  42     return NS_ERROR_FAILURE;
  43   }
  44
  45   mObserver->AddSink(this);
  46
  47   nsresult rv = UpdateState();
  48   if (NS_WARN_IF(NS_FAILED(rv))) {
  49     return rv;
  50   }
  51
  52   return NS_OK;
  53 }
  54
  55 PermissionStatus::~PermissionStatus() {
  56   if (mObserver) {
  57     mObserver->RemoveSink(this);
  58   }
  59 }
  60
  61 JSObject* PermissionStatus::WrapObject(JSContext* aCx,
  62                                        JS::Handle<JSObject*> aGivenProto) {
  63   return PermissionStatus_Binding::Wrap(aCx, this, aGivenProto);
  64 }
  65
  66 nsLiteralCString PermissionStatus::GetPermissionType() {
  67   return PermissionNameToType(mName);
  68 }
  69
  70 nsresult PermissionStatus::UpdateState() {
  71   nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
  72   if (NS_WARN_IF(!window)) {
  73     return NS_ERROR_FAILURE;
  74   }
  75
  76   RefPtr<Document> document = window->GetExtantDoc();
  77   if (NS_WARN_IF(!document)) {
  78     return NS_ERROR_FAILURE;
  79   }
  80
  81   uint32_t action = nsIPermissionManager::DENY_ACTION;
  82
  83   PermissionDelegateHandler* permissionHandler =
  84       document->GetPermissionDelegateHandler();
  85   if (NS_WARN_IF(!permissionHandler)) {
  86     return NS_ERROR_FAILURE;
  87   }
  88
  89   nsresult rv = permissionHandler->GetPermissionForPermissionsAPI(
  90       GetPermissionType(), &action);
  91   if (NS_WARN_IF(NS_FAILED(rv))) {
  92     return rv;
  93   }
  94
  95   mState = ActionToPermissionState(action);
  96   return NS_OK;
  97 }
  98
  99 already_AddRefed<nsIPrincipal> PermissionStatus::GetPrincipal() const {
 100   nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
 101   if (NS_WARN_IF(!window)) {
 102     return nullptr;
 103   }
 104
 105   Document* doc = window->GetExtantDoc();
 106   if (NS_WARN_IF(!doc)) {
 107     return nullptr;
 108   }
 109
 110   nsCOMPtr<nsIPrincipal> principal =
 111       Permission::ClonePrincipalForPermission(doc->NodePrincipal());
 112   NS_ENSURE_TRUE(principal, nullptr);
 113
 114   return principal.forget();
 115 }
 116
 117 void PermissionStatus::PermissionChanged() {
 118   nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
 119   if (NS_WARN_IF(!window) || !window->IsFullyActive()) {
 120     return;
 121   }
 122   auto oldState = mState;
 123   UpdateState();
 124   if (mState != oldState) {
 125     RefPtr<AsyncEventDispatcher> eventDispatcher =
 126         new AsyncEventDispatcher(this, u"change"_ns, CanBubble::eNo);
 127     eventDispatcher->PostDOMEvent();
 128   }
 129 }
 130
 131 void PermissionStatus::DisconnectFromOwner() {
 132   IgnoreKeepAliveIfHasListenersFor(nsGkAtoms::onchange);
 133
 134   if (mObserver) {
 135     mObserver->RemoveSink(this);
 136     mObserver = nullptr;
 137   }
 138
 139   DOMEventTargetHelper::DisconnectFromOwner();
 140 }
 141
 142 }  // namespace mozilla::dom