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comparison: dom/events/JSEventHandler.cpp
dom/events/JSEventHandler.cpp
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 #include "nsJSUtils.h" | |
| 6 #include "nsString.h" | |
| 7 #include "nsIServiceManager.h" | |
| 8 #include "nsIScriptSecurityManager.h" | |
| 9 #include "nsIScriptContext.h" | |
| 10 #include "nsIScriptGlobalObject.h" | |
| 11 #include "nsIXPConnect.h" | |
| 12 #include "nsIMutableArray.h" | |
| 13 #include "nsVariant.h" | |
| 14 #include "nsIDOMBeforeUnloadEvent.h" | |
| 15 #include "nsGkAtoms.h" | |
| 16 #include "xpcpublic.h" | |
| 17 #include "nsJSEnvironment.h" | |
| 18 #include "nsDOMJSUtils.h" | |
| 19 #include "WorkerPrivate.h" | |
| 20 #include "mozilla/ContentEvents.h" | |
| 21 #include "mozilla/CycleCollectedJSRuntime.h" | |
| 22 #include "mozilla/HoldDropJSObjects.h" | |
| 23 #include "mozilla/JSEventHandler.h" | |
| 24 #include "mozilla/Likely.h" | |
| 25 #include "mozilla/dom/ErrorEvent.h" | |
| 26 #include "mozilla/dom/UnionTypes.h" | |
| 27 | |
| 28 namespace mozilla { | |
| 29 | |
| 30 using namespace dom; | |
| 31 | |
| 32 JSEventHandler::JSEventHandler(nsISupports* aTarget, | |
| 33 nsIAtom* aType, | |
| 34 const TypedEventHandler& aTypedHandler) | |
| 35 : mEventName(aType) | |
| 36 , mTypedHandler(aTypedHandler) | |
| 37 { | |
| 38 nsCOMPtr<nsISupports> base = do_QueryInterface(aTarget); | |
| 39 mTarget = base.get(); | |
| 40 // Note, we call HoldJSObjects to get CanSkip called before CC. | |
| 41 HoldJSObjects(this); | |
| 42 } | |
| 43 | |
| 44 JSEventHandler::~JSEventHandler() | |
| 45 { | |
| 46 NS_ASSERTION(!mTarget, "Should have called Disconnect()!"); | |
| 47 DropJSObjects(this); | |
| 48 } | |
| 49 | |
| 50 NS_IMPL_CYCLE_COLLECTION_CLASS(JSEventHandler) | |
| 51 | |
| 52 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(JSEventHandler) | |
| 53 tmp->mTypedHandler.ForgetHandler(); | |
| 54 NS_IMPL_CYCLE_COLLECTION_UNLINK_END | |
| 55 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(JSEventHandler) | |
| 56 if (MOZ_UNLIKELY(cb.WantDebugInfo()) && tmp->mEventName) { | |
| 57 nsAutoCString name; | |
| 58 name.AppendLiteral("JSEventHandler handlerName="); | |
| 59 name.Append( | |
| 60 NS_ConvertUTF16toUTF8(nsDependentAtomString(tmp->mEventName)).get()); | |
| 61 cb.DescribeRefCountedNode(tmp->mRefCnt.get(), name.get()); | |
| 62 } else { | |
| 63 NS_IMPL_CYCLE_COLLECTION_DESCRIBE(JSEventHandler, tmp->mRefCnt.get()) | |
| 64 } | |
| 65 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mTypedHandler.Ptr()) | |
| 66 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS | |
| 67 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END | |
| 68 | |
| 69 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(JSEventHandler) | |
| 70 if (tmp->IsBlackForCC()) { | |
| 71 return true; | |
| 72 } | |
| 73 // If we have a target, it is the one which has tmp as onfoo handler. | |
| 74 if (tmp->mTarget) { | |
| 75 nsXPCOMCycleCollectionParticipant* cp = nullptr; | |
| 76 CallQueryInterface(tmp->mTarget, &cp); | |
| 77 nsISupports* canonical = nullptr; | |
| 78 tmp->mTarget->QueryInterface(NS_GET_IID(nsCycleCollectionISupports), | |
| 79 reinterpret_cast<void**>(&canonical)); | |
| 80 // Usually CanSkip ends up unmarking the event listeners of mTarget, | |
| 81 // so tmp may become black. | |
| 82 if (cp && canonical && cp->CanSkip(canonical, true)) { | |
| 83 return tmp->IsBlackForCC(); | |
| 84 } | |
| 85 } | |
| 86 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END | |
| 87 | |
| 88 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(JSEventHandler) | |
| 89 return tmp->IsBlackForCC(); | |
| 90 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END | |
| 91 | |
| 92 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(JSEventHandler) | |
| 93 return tmp->IsBlackForCC(); | |
| 94 NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END | |
| 95 | |
| 96 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JSEventHandler) | |
| 97 NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener) | |
| 98 NS_INTERFACE_MAP_ENTRY(nsISupports) | |
| 99 NS_INTERFACE_MAP_ENTRY(JSEventHandler) | |
| 100 NS_INTERFACE_MAP_END | |
| 101 | |
| 102 NS_IMPL_CYCLE_COLLECTING_ADDREF(JSEventHandler) | |
| 103 NS_IMPL_CYCLE_COLLECTING_RELEASE(JSEventHandler) | |
| 104 | |
| 105 bool | |
| 106 JSEventHandler::IsBlackForCC() | |
| 107 { | |
| 108 // We can claim to be black if all the things we reference are | |
| 109 // effectively black already. | |
| 110 return !mTypedHandler.HasEventHandler() || | |
| 111 !mTypedHandler.Ptr()->HasGrayCallable(); | |
| 112 } | |
| 113 | |
| 114 nsresult | |
| 115 JSEventHandler::HandleEvent(nsIDOMEvent* aEvent) | |
| 116 { | |
| 117 nsCOMPtr<EventTarget> target = do_QueryInterface(mTarget); | |
| 118 if (!target || !mTypedHandler.HasEventHandler() || | |
| 119 !GetTypedEventHandler().Ptr()->CallbackPreserveColor()) { | |
| 120 return NS_ERROR_FAILURE; | |
| 121 } | |
| 122 | |
| 123 Event* event = aEvent->InternalDOMEvent(); | |
| 124 bool isMainThread = event->IsMainThreadEvent(); | |
| 125 bool isChromeHandler = | |
| 126 isMainThread ? | |
| 127 nsContentUtils::GetObjectPrincipal( | |
| 128 GetTypedEventHandler().Ptr()->CallbackPreserveColor()) == | |
| 129 nsContentUtils::GetSystemPrincipal() : | |
| 130 mozilla::dom::workers::IsCurrentThreadRunningChromeWorker(); | |
| 131 | |
| 132 if (mTypedHandler.Type() == TypedEventHandler::eOnError) { | |
| 133 MOZ_ASSERT_IF(mEventName, mEventName == nsGkAtoms::onerror); | |
| 134 | |
| 135 nsString errorMsg, file; | |
| 136 EventOrString msgOrEvent; | |
| 137 Optional<nsAString> fileName; | |
| 138 Optional<uint32_t> lineNumber; | |
| 139 Optional<uint32_t> columnNumber; | |
| 140 Optional<JS::Handle<JS::Value>> error; | |
| 141 | |
| 142 NS_ENSURE_TRUE(aEvent, NS_ERROR_UNEXPECTED); | |
| 143 ErrorEvent* scriptEvent = aEvent->InternalDOMEvent()->AsErrorEvent(); | |
| 144 if (scriptEvent) { | |
| 145 scriptEvent->GetMessage(errorMsg); | |
| 146 msgOrEvent.SetAsString().SetData(errorMsg.Data(), errorMsg.Length()); | |
| 147 | |
| 148 scriptEvent->GetFilename(file); | |
| 149 fileName = &file; | |
| 150 | |
| 151 lineNumber.Construct(); | |
| 152 lineNumber.Value() = scriptEvent->Lineno(); | |
| 153 | |
| 154 columnNumber.Construct(); | |
| 155 columnNumber.Value() = scriptEvent->Colno(); | |
| 156 | |
| 157 ThreadsafeAutoJSContext cx; | |
| 158 error.Construct(cx); | |
| 159 scriptEvent->GetError(cx, &error.Value()); | |
| 160 } else { | |
| 161 msgOrEvent.SetAsEvent() = aEvent->InternalDOMEvent(); | |
| 162 } | |
| 163 | |
| 164 nsRefPtr<OnErrorEventHandlerNonNull> handler = | |
| 165 mTypedHandler.OnErrorEventHandler(); | |
| 166 ErrorResult rv; | |
| 167 bool handled = handler->Call(mTarget, msgOrEvent, fileName, lineNumber, | |
| 168 columnNumber, error, rv); | |
| 169 if (rv.Failed()) { | |
| 170 return rv.ErrorCode(); | |
| 171 } | |
| 172 | |
| 173 if (handled) { | |
| 174 event->PreventDefaultInternal(isChromeHandler); | |
| 175 } | |
| 176 return NS_OK; | |
| 177 } | |
| 178 | |
| 179 if (mTypedHandler.Type() == TypedEventHandler::eOnBeforeUnload) { | |
| 180 MOZ_ASSERT(mEventName == nsGkAtoms::onbeforeunload); | |
| 181 | |
| 182 nsRefPtr<OnBeforeUnloadEventHandlerNonNull> handler = | |
| 183 mTypedHandler.OnBeforeUnloadEventHandler(); | |
| 184 ErrorResult rv; | |
| 185 nsString retval; | |
| 186 handler->Call(mTarget, *(aEvent->InternalDOMEvent()), retval, rv); | |
| 187 if (rv.Failed()) { | |
| 188 return rv.ErrorCode(); | |
| 189 } | |
| 190 | |
| 191 nsCOMPtr<nsIDOMBeforeUnloadEvent> beforeUnload = do_QueryInterface(aEvent); | |
| 192 NS_ENSURE_STATE(beforeUnload); | |
| 193 | |
| 194 if (!DOMStringIsNull(retval)) { | |
| 195 event->PreventDefaultInternal(isChromeHandler); | |
| 196 | |
| 197 nsAutoString text; | |
| 198 beforeUnload->GetReturnValue(text); | |
| 199 | |
| 200 // Set the text in the beforeUnload event as long as it wasn't | |
| 201 // already set (through event.returnValue, which takes | |
| 202 // precedence over a value returned from a JS function in IE) | |
| 203 if (text.IsEmpty()) { | |
| 204 beforeUnload->SetReturnValue(retval); | |
| 205 } | |
| 206 } | |
| 207 | |
| 208 return NS_OK; | |
| 209 } | |
| 210 | |
| 211 MOZ_ASSERT(mTypedHandler.Type() == TypedEventHandler::eNormal); | |
| 212 ErrorResult rv; | |
| 213 nsRefPtr<EventHandlerNonNull> handler = mTypedHandler.NormalEventHandler(); | |
| 214 JS::Rooted<JS::Value> retval(CycleCollectedJSRuntime::Get()->Runtime()); | |
| 215 handler->Call(mTarget, *(aEvent->InternalDOMEvent()), &retval, rv); | |
| 216 if (rv.Failed()) { | |
| 217 return rv.ErrorCode(); | |
| 218 } | |
| 219 | |
| 220 // If the handler returned false and its sense is not reversed, | |
| 221 // or the handler returned true and its sense is reversed from | |
| 222 // the usual (false means cancel), then prevent default. | |
| 223 if (retval.isBoolean() && | |
| 224 retval.toBoolean() == (mEventName == nsGkAtoms::onerror || | |
| 225 mEventName == nsGkAtoms::onmouseover)) { | |
| 226 event->PreventDefaultInternal(isChromeHandler); | |
| 227 } | |
| 228 | |
| 229 return NS_OK; | |
| 230 } | |
| 231 | |
| 232 } // namespace mozilla | |
| 233 | |
| 234 using namespace mozilla; | |
| 235 | |
| 236 /* | |
| 237 * Factory functions | |
| 238 */ | |
| 239 | |
| 240 nsresult | |
| 241 NS_NewJSEventHandler(nsISupports* aTarget, | |
| 242 nsIAtom* aEventType, | |
| 243 const TypedEventHandler& aTypedHandler, | |
| 244 JSEventHandler** aReturn) | |
| 245 { | |
| 246 NS_ENSURE_ARG(aEventType || !NS_IsMainThread()); | |
| 247 JSEventHandler* it = | |
| 248 new JSEventHandler(aTarget, aEventType, aTypedHandler); | |
| 249 NS_ADDREF(*aReturn = it); | |
| 250 | |
| 251 return NS_OK; | |
| 252 } |
