JSBool
xpc_JSObjectIsID(JSContext *cx, JSObject* obj)
{
NS_ASSERTION(cx && obj, "bad param");
// NOTE: this call does NOT addref
XPCWrappedNative* wrapper =
XPCWrappedNative::GetWrappedNativeOfJSObject(cx, obj);
return wrapper &&
(wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSIID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSCID)));
}
bool
xpc_JSObjectIsID(JSContext* cx, JSObject* obj)
{
MOZ_ASSERT(cx && obj, "bad param");
// NOTE: this call does NOT addref
XPCWrappedNative* wrapper = nullptr;
obj = js::CheckedUnwrap(obj);
if (obj && IS_WN_REFLECTOR(obj))
wrapper = XPCWrappedNative::Get(obj);
return wrapper &&
(wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSIID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSCID)));
}
XPCWrappedNative*
XPCCallContext::UnwrapThisIfAllowed(HandleObject obj, HandleObject fun, unsigned argc)
{
// We should only get here for objects that aren't safe to unwrap.
MOZ_ASSERT(!js::CheckedUnwrap(obj));
MOZ_ASSERT(js::IsObjectInContextCompartment(obj, mJSContext));
// We can't do anything here without a function.
if (!fun)
return nullptr;
// Determine if we're allowed to unwrap the security wrapper to invoke the
// method.
//
// We have the Interface and Member that this corresponds to, but
// unfortunately our access checks are based on the object class name and
// property name. So we cheat a little bit here - we verify that the object
// does indeed implement the method's Interface, and then just check that we
// can successfully access property with method's name from the object.
// First, get the XPCWN out of the underlying object. We should have a wrapper
// here, potentially an outer window proxy, and then an XPCWN.
MOZ_ASSERT(js::IsWrapper(obj));
RootedObject unwrapped(mJSContext, js::UncheckedUnwrap(obj, /* stopAtOuter = */ false));
#ifdef DEBUG
JS::Rooted<JSObject*> wrappedObj(mJSContext, js::Wrapper::wrappedObject(obj));
MOZ_ASSERT(unwrapped == JS_ObjectToInnerObject(mJSContext, wrappedObj));
#endif
// Make sure we have an XPCWN, and grab it.
if (!IS_WN_REFLECTOR(unwrapped))
return nullptr;
XPCWrappedNative *wn = XPCWrappedNative::Get(unwrapped);
// Next, get the call info off the function object.
XPCNativeInterface *interface;
XPCNativeMember *member;
XPCNativeMember::GetCallInfo(fun, &interface, &member);
// To be extra safe, make sure that the underlying native implements the
// interface before unwrapping. Even if we didn't check this, we'd still
// theoretically fail during tearoff lookup for mismatched methods.
if (!wn->HasInterfaceNoQI(*interface->GetIID()))
return nullptr;
// See if the access is permitted.
//
// NB: This calculation of SET vs GET is a bit wonky, but that's what
// XPC_WN_GetterSetter does.
bool set = argc && argc != NO_ARGS && member->IsWritableAttribute();
js::Wrapper::Action act = set ? js::Wrapper::SET : js::Wrapper::GET;
const js::Wrapper *handler = js::Wrapper::wrapperHandler(obj);
bool ignored;
JS::Rooted<jsid> id(mJSContext, member->GetName());
if (!handler->enter(mJSContext, obj, id, act, &ignored))
return nullptr;
// Ok, this call is safe.
return wn;
}
// note: returned pointer is only valid while |obj| remains alive!
const nsID*
xpc_JSObjectToID(JSContext *cx, JSObject* obj)
{
if (!cx || !obj)
return nsnull;
// NOTE: this call does NOT addref
XPCWrappedNative* wrapper =
XPCWrappedNative::GetWrappedNativeOfJSObject(cx, obj);
if (wrapper &&
(wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSIID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSCID)))) {
return ((nsIJSID*)wrapper->GetIdentityObject())->GetID();
}
return nsnull;
}
// note: returned pointer is only valid while |obj| remains alive!
const nsID*
xpc_JSObjectToID(JSContext* cx, JSObject* obj)
{
if (!cx || !obj)
return nullptr;
// NOTE: this call does NOT addref
XPCWrappedNative* wrapper = nullptr;
obj = js::CheckedUnwrap(obj);
if (obj && IS_WN_REFLECTOR(obj))
wrapper = XPCWrappedNative::Get(obj);
if (wrapper &&
(wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSIID)) ||
wrapper->HasInterfaceNoQI(NS_GET_IID(nsIJSCID)))) {
return ((nsIJSID*)wrapper->GetIdentityObject())->GetID();
}
return nullptr;
}
