third_party/WebKit/Source/bindings/core/v8/custom/V8WindowCustom.cpp

/*
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 * modification, are permitted provided that the following conditions are
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#include "bindings/core/v8/V8Window.h"

#include "bindings/core/v8/BindingSecurity.h"
#include "bindings/core/v8/ExceptionMessages.h"
#include "bindings/core/v8/ExceptionState.h"
#include "bindings/core/v8/ScriptController.h"
#include "bindings/core/v8/ScriptSourceCode.h"
#include "bindings/core/v8/SerializedScriptValue.h"
#include "bindings/core/v8/SerializedScriptValueFactory.h"
#include "bindings/core/v8/Transferables.h"
#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8EventListener.h"
#include "bindings/core/v8/V8EventListenerList.h"
#include "bindings/core/v8/V8HTMLCollection.h"
#include "bindings/core/v8/V8HiddenValue.h"
#include "bindings/core/v8/V8Node.h"
#include "core/dom/DOMArrayBuffer.h"
#include "core/dom/MessagePort.h"
#include "core/frame/Deprecation.h"
#include "core/frame/FrameView.h"
#include "core/frame/ImageBitmap.h"
#include "core/frame/LocalDOMWindow.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Settings.h"
#include "core/frame/UseCounter.h"
#include "core/frame/csp/ContentSecurityPolicy.h"
#include "core/html/HTMLCollection.h"
#include "core/html/HTMLDocument.h"
#include "core/inspector/MainThreadDebugger.h"
#include "core/loader/FrameLoadRequest.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "platform/LayoutTestSupport.h"
#include "wtf/Assertions.h"

namespace blink {

void V8Window::eventAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
{
    LocalDOMWindow* impl = toLocalDOMWindow(V8Window::toImpl(info.Holder()));
    ExceptionState exceptionState(ExceptionState::GetterContext, "event", "Window", info.Holder(), info.GetIsolate());
    if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), impl, exceptionState)) {
        return;
    }

    LocalFrame* frame = impl->frame();
    ASSERT(frame);
    // This is a fast path to retrieve info.Holder()->CreationContext().
    v8::Local<v8::Context> context = toV8Context(frame, DOMWrapperWorld::current(info.GetIsolate()));
    if (context.IsEmpty())
        return;

    v8::Local<v8::Value> jsEvent = V8HiddenValue::getHiddenValue(ScriptState::current(info.GetIsolate()), context->Global(), V8HiddenValue::event(info.GetIsolate()));
    if (jsEvent.IsEmpty())
        return;
    v8SetReturnValue(info, jsEvent);
}

void V8Window::eventAttributeSetterCustom(v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info)
{
    LocalDOMWindow* impl = toLocalDOMWindow(V8Window::toImpl(info.Holder()));
    ExceptionState exceptionState(ExceptionState::SetterContext, "event", "Window", info.Holder(), info.GetIsolate());
    if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), impl, exceptionState)) {
        return;
    }

    LocalFrame* frame = impl->frame();
    ASSERT(frame);
    // This is a fast path to retrieve info.Holder()->CreationContext().
    v8::Local<v8::Context> context = toV8Context(frame, DOMWrapperWorld::current(info.GetIsolate()));
    if (context.IsEmpty())
        return;

    V8HiddenValue::setHiddenValue(ScriptState::current(info.GetIsolate()), context->Global(), V8HiddenValue::event(info.GetIsolate()), value);
}

void V8Window::frameElementAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
{
    LocalDOMWindow* impl = toLocalDOMWindow(V8Window::toImpl(info.Holder()));

    if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), impl->frameElement(), BindingSecurity::ErrorReportOption::DoNotReport)) {
        v8SetReturnValueNull(info);
        return;
    }

    // The wrapper for an <iframe> should get its prototype from the context of the frame it's in, rather than its own frame.
    // So, use its containing document as the creation context when wrapping.
    v8::Local<v8::Value> creationContext = toV8(&impl->frameElement()->document(), info.Holder(), info.GetIsolate());
    RELEASE_ASSERT(!creationContext.IsEmpty());
    v8::Local<v8::Value> wrapper = toV8(impl->frameElement(), v8::Local<v8::Object>::Cast(creationContext), info.GetIsolate());
    v8SetReturnValue(info, wrapper);
}

void V8Window::openerAttributeSetterCustom(v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info)
{
    v8::Isolate* isolate = info.GetIsolate();
    DOMWindow* impl = V8Window::toImpl(info.Holder());
    ExceptionState exceptionState(ExceptionState::SetterContext, "opener", "Window", info.Holder(), isolate);
    if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), impl, exceptionState)) {
        return;
    }

    // Opener can be shadowed if it is in the same domain.
    // Have a special handling of null value to behave
    // like Firefox. See bug http://b/1224887 & http://b/791706.
    if (value->IsNull()) {
        // impl->frame() has to be a non-null LocalFrame.  Otherwise, the
        // same-origin check would have failed.
        ASSERT(impl->frame());
        toLocalFrame(impl->frame())->loader().setOpener(0);
    }

    // Delete the accessor from the inner object.
    info.Holder()->Delete(isolate->GetCurrentContext(), v8AtomicString(isolate, "opener"));

    // Put property on the inner object.
    if (info.Holder()->IsObject()) {
        v8::Maybe<bool> unused = v8::Local<v8::Object>::Cast(info.Holder())->Set(isolate->GetCurrentContext(), v8AtomicString(isolate, "opener"), value);
        ALLOW_UNUSED_LOCAL(unused);
    }
}

void V8Window::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
{
    ExceptionState exceptionState(ExceptionState::ExecutionContext, "postMessage", "Window", info.Holder(), info.GetIsolate());
    if (UNLIKELY(info.Length() < 2)) {
        setMinimumArityTypeError(exceptionState, 2, info.Length());
        return;
    }

    // None of these need to be RefPtr because info and context are guaranteed
    // to hold on to them.
    DOMWindow* window = V8Window::toImpl(info.Holder());
    // TODO(yukishiino): The HTML spec specifies that we should use the
    // Incumbent Realm instead of the Current Realm, but currently we don't have
    // a way to retrieve the Incumbent Realm.  See also:
    // https://html.spec.whatwg.org/multipage/comms.html#dom-window-postmessage
    LocalDOMWindow* source = currentDOMWindow(info.GetIsolate());

    ASSERT(window);
    UseCounter::countIfNotPrivateScript(info.GetIsolate(), window->frame(), UseCounter::WindowPostMessage);

    // If called directly by WebCore we don't have a calling context.
    if (!source) {
        exceptionState.throwTypeError("No active calling context exists.");
        return;
    }

    // This function has variable arguments and can be:
    //   postMessage(message, targetOrigin)
    //   postMessage(message, targetOrigin, {sequence of transferrables})
    // TODO(foolip): Type checking of the arguments should happen in order, so
    // that e.g. postMessage({}, { toString: () => { throw Error(); } }, 0)
    // throws the Error from toString, not the TypeError for argument 3.
    Transferables transferables;
    const int targetOriginArgIndex = 1;
    if (info.Length() > 2) {
        const int transferablesArgIndex = 2;
        if (!SerializedScriptValue::extractTransferables(info.GetIsolate(), info[transferablesArgIndex], transferablesArgIndex, transferables, exceptionState)) {
            return;
        }
    }
    // TODO(foolip): targetOrigin should be a USVString in IDL and treated as
    // such here, without TreatNullAndUndefinedAsNullString.
    TOSTRING_VOID(V8StringResource<TreatNullAndUndefinedAsNullString>, targetOrigin, info[targetOriginArgIndex]);

    RefPtr<SerializedScriptValue> message = SerializedScriptValue::serialize(info.GetIsolate(), info[0], &transferables, nullptr, exceptionState);
    if (exceptionState.hadException())
        return;

    window->postMessage(message.release(), transferables.messagePorts, targetOrigin, source, exceptionState);
}

void V8Window::openMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
{
    DOMWindow* impl = V8Window::toImpl(info.Holder());
    ExceptionState exceptionState(ExceptionState::ExecutionContext, "open", "Window", info.Holder(), info.GetIsolate());
    if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), impl, exceptionState)) {
        return;
    }

    TOSTRING_VOID(V8StringResource<TreatNullAndUndefinedAsNullString>, urlString, info[0]);
    AtomicString frameName;
    if (info[1]->IsUndefined() || info[1]->IsNull()) {
        frameName = "_blank";
    } else {
        TOSTRING_VOID(V8StringResource<>, frameNameResource, info[1]);
        frameName = frameNameResource;
    }
    TOSTRING_VOID(V8StringResource<TreatNullAndUndefinedAsNullString>, windowFeaturesString, info[2]);

    // |impl| has to be a LocalDOMWindow, since RemoteDOMWindows wouldn't have
    // passed the BindingSecurity check above.
    DOMWindow* openedWindow = toLocalDOMWindow(impl)->open(urlString, frameName, windowFeaturesString, currentDOMWindow(info.GetIsolate()), enteredDOMWindow(info.GetIsolate()));
    if (!openedWindow)
        return;

    v8SetReturnValueFast(info, openedWindow, impl);
}

void V8Window::namedPropertyGetterCustom(v8::Local<v8::Name> name, const v8::PropertyCallbackInfo<v8::Value>& info)
{
    auto nameString = name.As<v8::String>();
    DOMWindow* window = V8Window::toImpl(info.Holder());
    if (!window)
        return;

    Frame* frame = window->frame();
    // window is detached from a frame.
    if (!frame)
        return;

    AtomicString propName = toCoreAtomicString(nameString);

    // Note that the spec doesn't allow any cross-origin named access to the window object. However,
    // UAs have traditionally allowed named access to named child browsing contexts, even across
    // origins. So first, search child frames for a frame with a matching name.
    Frame* child = frame->tree().scopedChild(propName);
    if (child) {
        v8SetReturnValueFast(info, child->domWindow(), window);
        return;
    }

    // If the frame is remote, the caller will never be able to access further named results.
    if (!frame->isLocalFrame())
        return;

    // Search named items in the document.
    Document* doc = toLocalFrame(frame)->document();
    if (!doc || !doc->isHTMLDocument())
        return;

    // This is an AllCanRead interceptor.  Check that the caller has access to the named results.
    if (!BindingSecurity::shouldAllowAccessTo(currentDOMWindow(info.GetIsolate()), window, BindingSecurity::ErrorReportOption::DoNotReport))
        return;

    bool hasNamedItem = toHTMLDocument(doc)->hasNamedItem(propName);
    bool hasIdItem = doc->hasElementWithId(propName);

    if (!hasNamedItem && !hasIdItem)
        return;

    if (!hasNamedItem && hasIdItem && !doc->containsMultipleElementsWithId(propName)) {
        v8SetReturnValueFast(info, doc->getElementById(propName), window);
        return;
    }

    HTMLCollection* items = doc->windowNamedItems(propName);
    if (!items->isEmpty()) {
        // TODO(esprehn): Firefox doesn't return an HTMLCollection here if there's
        // multiple with the same name, but Chrome and Safari does. What's the
        // right behavior?
        if (items->hasExactlyOneItem()) {
            v8SetReturnValueFast(info, items->item(0), window);
            return;
        }
        v8SetReturnValueFast(info, items, window);
        return;
    }
}

} // namespace blink