michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * vim: set ts=2 sw=2 et tw=99 ft=cpp: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "mozilla/dom/DOMJSProxyHandler.h"
michael@0: #include "xpcpublic.h"
michael@0: #include "xpcprivate.h"
michael@0: #include "XPCQuickStubs.h"
michael@0: #include "XPCWrapper.h"
michael@0: #include "WrapperFactory.h"
michael@0: #include "nsDOMClassInfo.h"
michael@0: #include "nsWrapperCacheInlines.h"
michael@0: #include "mozilla/dom/BindingUtils.h"
michael@0: 
michael@0: #include "jsapi.h"
michael@0: 
michael@0: using namespace JS;
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: 
michael@0: jsid s_length_id = JSID_VOID;
michael@0: 
michael@0: bool
michael@0: DefineStaticJSVals(JSContext* cx)
michael@0: {
michael@0:   return InternJSString(cx, s_length_id, "length");
michael@0: }
michael@0: 
michael@0: 
michael@0: const char HandlerFamily = 0;
michael@0: 
michael@0: js::DOMProxyShadowsResult
michael@0: DOMProxyShadows(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id)
michael@0: {
michael@0:   JS::Value v = js::GetProxyExtra(proxy, JSPROXYSLOT_EXPANDO);
michael@0:   if (v.isObject()) {
michael@0:     bool hasOwn;
michael@0:     Rooted<JSObject*> object(cx, &v.toObject());
michael@0:     if (!JS_AlreadyHasOwnPropertyById(cx, object, id, &hasOwn))
michael@0:       return js::ShadowCheckFailed;
michael@0: 
michael@0:     return hasOwn ? js::Shadows : js::DoesntShadow;
michael@0:   }
michael@0: 
michael@0:   if (v.isUndefined()) {
michael@0:     return js::DoesntShadow;
michael@0:   }
michael@0: 
michael@0:   bool hasOwn;
michael@0:   if (!GetProxyHandler(proxy)->hasOwn(cx, proxy, id, &hasOwn))
michael@0:     return js::ShadowCheckFailed;
michael@0: 
michael@0:   return hasOwn ? js::Shadows : js::DoesntShadowUnique;
michael@0: }
michael@0: 
michael@0: // Store the information for the specialized ICs.
michael@0: struct SetDOMProxyInformation
michael@0: {
michael@0:   SetDOMProxyInformation() {
michael@0:     js::SetDOMProxyInformation((const void*) &HandlerFamily,
michael@0:                                js::PROXY_EXTRA_SLOT + JSPROXYSLOT_EXPANDO, DOMProxyShadows);
michael@0:   }
michael@0: };
michael@0: 
michael@0: SetDOMProxyInformation gSetDOMProxyInformation;
michael@0: 
michael@0: // static
michael@0: JSObject*
michael@0: DOMProxyHandler::GetAndClearExpandoObject(JSObject* obj)
michael@0: {
michael@0:   MOZ_ASSERT(IsDOMProxy(obj), "expected a DOM proxy object");
michael@0:   JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
michael@0:   if (v.isUndefined()) {
michael@0:     return nullptr;
michael@0:   }
michael@0: 
michael@0:   if (v.isObject()) {
michael@0:     js::SetProxyExtra(obj, JSPROXYSLOT_EXPANDO, UndefinedValue());
michael@0:     XPCWrappedNativeScope* scope = xpc::MaybeGetObjectScope(obj);
michael@0:     if (scope) {
michael@0:       scope->RemoveDOMExpandoObject(obj);
michael@0:     }
michael@0:   } else {
michael@0:     js::ExpandoAndGeneration* expandoAndGeneration =
michael@0:       static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
michael@0:     v = expandoAndGeneration->expando;
michael@0:     if (v.isUndefined()) {
michael@0:       return nullptr;
michael@0:     }
michael@0:     expandoAndGeneration->expando = UndefinedValue();
michael@0:   }
michael@0: 
michael@0: 
michael@0:   return &v.toObject();
michael@0: }
michael@0: 
michael@0: // static
michael@0: JSObject*
michael@0: DOMProxyHandler::EnsureExpandoObject(JSContext* cx, JS::Handle<JSObject*> obj)
michael@0: {
michael@0:   NS_ASSERTION(IsDOMProxy(obj), "expected a DOM proxy object");
michael@0:   JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
michael@0:   if (v.isObject()) {
michael@0:     return &v.toObject();
michael@0:   }
michael@0: 
michael@0:   js::ExpandoAndGeneration* expandoAndGeneration;
michael@0:   if (!v.isUndefined()) {
michael@0:     expandoAndGeneration = static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
michael@0:     if (expandoAndGeneration->expando.isObject()) {
michael@0:       return &expandoAndGeneration->expando.toObject();
michael@0:     }
michael@0:   } else {
michael@0:     expandoAndGeneration = nullptr;
michael@0:   }
michael@0: 
michael@0:   JS::Rooted<JSObject*> parent(cx, js::GetObjectParent(obj));
michael@0:   JS::Rooted<JSObject*> expando(cx,
michael@0:     JS_NewObjectWithGivenProto(cx, nullptr, JS::NullPtr(), parent));
michael@0:   if (!expando) {
michael@0:     return nullptr;
michael@0:   }
michael@0: 
michael@0:   nsISupports* native = UnwrapDOMObject<nsISupports>(obj);
michael@0:   nsWrapperCache* cache;
michael@0:   CallQueryInterface(native, &cache);
michael@0:   if (expandoAndGeneration) {
michael@0:     cache->PreserveWrapper(native);
michael@0:     expandoAndGeneration->expando.setObject(*expando);
michael@0: 
michael@0:     return expando;
michael@0:   }
michael@0: 
michael@0:   XPCWrappedNativeScope* scope = xpc::GetObjectScope(obj);
michael@0:   if (!scope->RegisterDOMExpandoObject(obj)) {
michael@0:     return nullptr;
michael@0:   }
michael@0: 
michael@0:   cache->SetPreservingWrapper(true);
michael@0:   js::SetProxyExtra(obj, JSPROXYSLOT_EXPANDO, ObjectValue(*expando));
michael@0: 
michael@0:   return expando;
michael@0: }
michael@0: 
michael@0: bool
michael@0: DOMProxyHandler::isExtensible(JSContext *cx, JS::Handle<JSObject*> proxy, bool *extensible)
michael@0: {
michael@0:   // always extensible per WebIDL
michael@0:   *extensible = true;
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: DOMProxyHandler::preventExtensions(JSContext *cx, JS::Handle<JSObject*> proxy)
michael@0: {
michael@0:   // Throw a TypeError, per WebIDL.
michael@0:   JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
michael@0:                        JSMSG_CANT_CHANGE_EXTENSIBILITY);
michael@0:   return false;
michael@0: }
michael@0: 
michael@0: bool
michael@0: BaseDOMProxyHandler::getPropertyDescriptor(JSContext* cx,
michael@0:                                            JS::Handle<JSObject*> proxy,
michael@0:                                            JS::Handle<jsid> id,
michael@0:                                            MutableHandle<JSPropertyDescriptor> desc)
michael@0: {
michael@0:   if (!getOwnPropertyDescriptor(cx, proxy, id, desc)) {
michael@0:     return false;
michael@0:   }
michael@0:   if (desc.object()) {
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   JS::Rooted<JSObject*> proto(cx);
michael@0:   if (!js::GetObjectProto(cx, proxy, &proto)) {
michael@0:     return false;
michael@0:   }
michael@0:   if (!proto) {
michael@0:     desc.object().set(nullptr);
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   return JS_GetPropertyDescriptorById(cx, proto, id, desc);
michael@0: }
michael@0: 
michael@0: bool
michael@0: BaseDOMProxyHandler::getOwnPropertyDescriptor(JSContext* cx,
michael@0:                                               JS::Handle<JSObject*> proxy,
michael@0:                                               JS::Handle<jsid> id,
michael@0:                                               MutableHandle<JSPropertyDescriptor> desc)
michael@0: {
michael@0:   return getOwnPropDescriptor(cx, proxy, id, /* ignoreNamedProps = */ false,
michael@0:                               desc);
michael@0: }
michael@0: 
michael@0: bool
michael@0: DOMProxyHandler::defineProperty(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
michael@0:                                 MutableHandle<JSPropertyDescriptor> desc, bool* defined)
michael@0: {
michael@0:   if (desc.hasGetterObject() && desc.setter() == JS_StrictPropertyStub) {
michael@0:     return JS_ReportErrorFlagsAndNumber(cx,
michael@0:                                         JSREPORT_WARNING | JSREPORT_STRICT |
michael@0:                                         JSREPORT_STRICT_MODE_ERROR,
michael@0:                                         js_GetErrorMessage, nullptr,
michael@0:                                         JSMSG_GETTER_ONLY);
michael@0:   }
michael@0: 
michael@0:   if (xpc::WrapperFactory::IsXrayWrapper(proxy)) {
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   JSObject* expando = EnsureExpandoObject(cx, proxy);
michael@0:   if (!expando) {
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   bool dummy;
michael@0:   return js_DefineOwnProperty(cx, expando, id, desc, &dummy);
michael@0: }
michael@0: 
michael@0: bool
michael@0: DOMProxyHandler::set(JSContext *cx, Handle<JSObject*> proxy, Handle<JSObject*> receiver,
michael@0:                      Handle<jsid> id, bool strict, MutableHandle<JS::Value> vp)
michael@0: {
michael@0:   MOZ_ASSERT(!xpc::WrapperFactory::IsXrayWrapper(proxy),
michael@0:              "Should not have a XrayWrapper here");
michael@0:   bool done;
michael@0:   if (!setCustom(cx, proxy, id, vp, &done)) {
michael@0:     return false;
michael@0:   }
michael@0:   if (done) {
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   // Make sure to ignore our named properties when checking for own
michael@0:   // property descriptors for a set.
michael@0:   JS::Rooted<JSPropertyDescriptor> desc(cx);
michael@0:   if (!getOwnPropDescriptor(cx, proxy, id, /* ignoreNamedProps = */ true,
michael@0:                             &desc)) {
michael@0:     return false;
michael@0:   }
michael@0:   bool descIsOwn = desc.object() != nullptr;
michael@0:   if (!desc.object()) {
michael@0:     // Don't just use getPropertyDescriptor, unlike BaseProxyHandler::set,
michael@0:     // because that would call getOwnPropertyDescriptor on ourselves.  Instead,
michael@0:     // directly delegate to the proto, if any.
michael@0:     JS::Rooted<JSObject*> proto(cx);
michael@0:     if (!js::GetObjectProto(cx, proxy, &proto)) {
michael@0:       return false;
michael@0:     }
michael@0:     if (proto && !JS_GetPropertyDescriptorById(cx, proto, id, &desc)) {
michael@0:       return false;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   return js::SetPropertyIgnoringNamedGetter(cx, this, proxy, receiver, id,
michael@0:                                             &desc, descIsOwn, strict, vp);
michael@0: }
michael@0: 
michael@0: bool
michael@0: DOMProxyHandler::delete_(JSContext* cx, JS::Handle<JSObject*> proxy,
michael@0:                          JS::Handle<jsid> id, bool* bp)
michael@0: {
michael@0:   JS::Rooted<JSObject*> expando(cx);
michael@0:   if (!xpc::WrapperFactory::IsXrayWrapper(proxy) && (expando = GetExpandoObject(proxy))) {
michael@0:     return JS_DeletePropertyById2(cx, expando, id, bp);
michael@0:   }
michael@0: 
michael@0:   *bp = true;
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: BaseDOMProxyHandler::enumerate(JSContext* cx, JS::Handle<JSObject*> proxy,
michael@0:                                AutoIdVector& props)
michael@0: {
michael@0:   JS::Rooted<JSObject*> proto(cx);
michael@0:   if (!JS_GetPrototype(cx, proxy, &proto))  {
michael@0:     return false;
michael@0:   }
michael@0:   return keys(cx, proxy, props) &&
michael@0:          (!proto || js::GetPropertyNames(cx, proto, 0, &props));
michael@0: }
michael@0: 
michael@0: bool
michael@0: BaseDOMProxyHandler::watch(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
michael@0:                            JS::Handle<JSObject*> callable)
michael@0: {
michael@0:   return js::WatchGuts(cx, proxy, id, callable);
michael@0: }
michael@0: 
michael@0: bool
michael@0: BaseDOMProxyHandler::unwatch(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id)
michael@0: {
michael@0:   return js::UnwatchGuts(cx, proxy, id);
michael@0: }
michael@0: 
michael@0: bool
michael@0: BaseDOMProxyHandler::getOwnPropertyNames(JSContext* cx,
michael@0:                                          JS::Handle<JSObject*> proxy,
michael@0:                                          JS::AutoIdVector& props)
michael@0: {
michael@0:   return ownPropNames(cx, proxy, JSITER_OWNONLY | JSITER_HIDDEN, props);
michael@0: }
michael@0: 
michael@0: bool
michael@0: BaseDOMProxyHandler::keys(JSContext* cx,
michael@0:                           JS::Handle<JSObject*> proxy,
michael@0:                           JS::AutoIdVector& props)
michael@0: {
michael@0:   return ownPropNames(cx, proxy, JSITER_OWNONLY, props);
michael@0: }
michael@0: 
michael@0: bool
michael@0: DOMProxyHandler::has(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id, bool* bp)
michael@0: {
michael@0:   if (!hasOwn(cx, proxy, id, bp)) {
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   if (*bp) {
michael@0:     // We have the property ourselves; no need to worry about our prototype
michael@0:     // chain.
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   // OK, now we have to look at the proto
michael@0:   JS::Rooted<JSObject*> proto(cx);
michael@0:   if (!js::GetObjectProto(cx, proxy, &proto)) {
michael@0:     return false;
michael@0:   }
michael@0:   if (!proto) {
michael@0:     return true;
michael@0:   }
michael@0:   bool protoHasProp;
michael@0:   bool ok = JS_HasPropertyById(cx, proto, id, &protoHasProp);
michael@0:   if (ok) {
michael@0:     *bp = protoHasProp;
michael@0:   }
michael@0:   return ok;
michael@0: }
michael@0: 
michael@0: int32_t
michael@0: IdToInt32(JSContext* cx, JS::Handle<jsid> id)
michael@0: {
michael@0:   JS::Rooted<JS::Value> idval(cx);
michael@0:   double array_index;
michael@0:   int32_t i;
michael@0:   if (!::JS_IdToValue(cx, id, &idval) ||
michael@0:       !JS::ToNumber(cx, idval, &array_index) ||
michael@0:       !::JS_DoubleIsInt32(array_index, &i)) {
michael@0:     return -1;
michael@0:   }
michael@0: 
michael@0:   return i;
michael@0: }
michael@0: 
michael@0: bool
michael@0: DOMProxyHandler::setCustom(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
michael@0:                            JS::MutableHandle<JS::Value> vp, bool *done)
michael@0: {
michael@0:   *done = false;
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: } // namespace dom
michael@0: } // namespace mozilla