2010-07-02 14:09:48 -07:00
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=4 sw=4 et tw=99 ft=cpp:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code, released
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* June 24, 2010.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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*
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* Contributor(s):
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* Andreas Gal <gal@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "XrayWrapper.h"
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#include "AccessCheck.h"
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#include "FilteringWrapper.h"
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#include "CrossOriginWrapper.h"
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#include "WrapperFactory.h"
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#include "jscntxt.h"
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#include "XPCWrapper.h"
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#include "xpcprivate.h"
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namespace xpc {
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using namespace js;
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static const uint32 JSSLOT_WN_OBJ = JSSLOT_PRIVATE;
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static JSBool
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holder_get(JSContext *cx, JSObject *holder, jsid id, jsval *vp);
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static JSBool
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holder_set(JSContext *cx, JSObject *holder, jsid id, jsval *vp);
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static JSBool
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holder_enumerate(JSContext *cx, JSObject *holder);
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JSClass HolderClass = {
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"NativePropertyHolder",
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JSCLASS_HAS_RESERVED_SLOTS(1),
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JS_PropertyStub, JS_PropertyStub, holder_get, holder_set,
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holder_enumerate, JS_ResolveStub, JS_ConvertStub, NULL,
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NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL
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};
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template <typename Base>
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XrayWrapper<Base>::XrayWrapper(uintN flags) : Base(flags)
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{
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}
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template <typename Base>
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XrayWrapper<Base>::~XrayWrapper()
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{
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}
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static XPCWrappedNative *
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GetWrappedNative(JSObject *obj)
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{
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NS_ASSERTION(IS_WN_WRAPPER_OBJECT(obj), "expected a wrapped native here");
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return static_cast<XPCWrappedNative *>(obj->getPrivate());
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}
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static JSObject *
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GetWrappedNativeObjectFromHolder(JSContext *cx, JSObject *holder)
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{
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NS_ASSERTION(holder->getJSClass() == &HolderClass, "expected a native property holder object");
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JSObject *wrappedObj = &holder->getSlot(JSSLOT_WN_OBJ).toObject();
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OBJ_TO_INNER_OBJECT(cx, wrappedObj);
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return wrappedObj;
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2010-07-02 14:09:48 -07:00
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}
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// Some DOM objects have shared properties that don't have an explicit
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// getter/setter and rely on the class getter/setter. We install a
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// class getter/setter on the holder object to trigger them.
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static JSBool
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holder_get(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
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{
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if (obj->isWrapper()) {
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#ifdef DEBUG
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{
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typedef FilteringWrapper<XrayWrapper<CrossOriginWrapper>,
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CrossOriginAccessiblePropertiesOnly>
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FilteringXRay;
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JSProxyHandler *handler = obj->getProxyHandler();
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NS_ASSERTION(handler == &XrayWrapper<JSCrossCompartmentWrapper>::singleton ||
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handler == &XrayWrapper<CrossOriginWrapper>::singleton ||
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handler == &FilteringXRay::singleton,
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"bad object");
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}
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#endif
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obj = obj->unwrap();
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}
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JSObject *wnObject = GetWrappedNativeObjectFromHolder(cx, obj);
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XPCWrappedNative *wn = GetWrappedNative(wnObject);
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if (NATIVE_HAS_FLAG(wn, WantGetProperty)) {
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JSBool retval = true;
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nsresult rv = wn->GetScriptableCallback()->GetProperty(wn, cx, obj, id, vp, &retval);
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if (NS_FAILED(rv)) {
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if (retval) {
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XPCThrower::Throw(rv, cx);
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}
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return false;
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}
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}
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return true;
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}
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static JSBool
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holder_set(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
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{
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JSObject *wnObject = GetWrappedNativeObjectFromHolder(cx, obj);
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XPCWrappedNative *wn = GetWrappedNative(wnObject);
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if (NATIVE_HAS_FLAG(wn, WantSetProperty)) {
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JSBool retval = true;
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nsresult rv = wn->GetScriptableCallback()->SetProperty(wn, cx, obj, id, vp, &retval);
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if (NS_FAILED(rv)) {
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if (retval) {
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XPCThrower::Throw(rv, cx);
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}
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return false;
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}
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}
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return true;
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}
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static bool
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ResolveNativeProperty(JSContext *cx, JSObject *holder, jsid id, bool set, JSPropertyDescriptor *desc)
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{
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desc->obj = NULL;
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NS_ASSERTION(holder->getJSClass() == &HolderClass, "expected a native property holder object");
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JSObject *wnObject = GetWrappedNativeObjectFromHolder(cx, holder);
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XPCWrappedNative *wn = GetWrappedNative(wnObject);
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// This will do verification and the method lookup for us.
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XPCCallContext ccx(JS_CALLER, cx, wnObject, nsnull, id);
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// Run the resolve hook of the wrapped native.
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if (NATIVE_HAS_FLAG(wn, WantNewResolve)) {
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JSBool retval = true;
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JSObject *pobj = NULL;
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uintN flags = cx->resolveFlags | (set ? JSRESOLVE_ASSIGNING : 0);
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nsresult rv = wn->GetScriptableInfo()->GetCallback()->NewResolve(wn, cx, holder, id, flags,
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&pobj, &retval);
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if (NS_FAILED(rv)) {
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if (retval) {
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XPCThrower::Throw(rv, cx);
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}
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return false;
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2010-07-02 14:09:48 -07:00
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}
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2010-09-02 16:02:51 -07:00
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if (pobj) {
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return JS_GetPropertyDescriptorById(cx, pobj, id, cx->resolveFlags, desc);
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}
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}
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// There are no native numeric properties, so we can shortcut here. We will not
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// find the property.
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if (!JSID_IS_ATOM(id)) {
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/* Not found */
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return true;
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}
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XPCNativeInterface *iface;
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XPCNativeMember *member;
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if (ccx.GetWrapper() != wn ||
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!wn->IsValid() ||
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!(iface = ccx.GetInterface()) ||
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!(member = ccx.GetMember())) {
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/* Not found */
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return true;
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}
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desc->obj = holder;
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desc->attrs = JSPROP_ENUMERATE;
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desc->getter = NULL;
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desc->setter = NULL;
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desc->shortid = NULL;
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desc->value = JSVAL_VOID;
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if (member->IsConstant()) {
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if (!member->GetConstantValue(ccx, iface, &desc->value)) {
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JS_ReportError(cx, "Failed to convert constant native property to JS value");
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return false;
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}
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} else if (member->IsAttribute()) {
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// This is a getter/setter. Clone a function for it.
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jsval fval;
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if (!member->NewFunctionObject(ccx, iface, wnObject, &fval)) {
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JS_ReportError(cx, "Failed to clone function object for native getter/setter");
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return false;
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}
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desc->getter = CastAsJSPropertyOp(JSVAL_TO_OBJECT(fval));
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desc->attrs |= JSPROP_GETTER;
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if (member->IsWritableAttribute()) {
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desc->setter = desc->getter;;
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desc->attrs |= JSPROP_SETTER;
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}
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// Make the property shared on the holder so no slot is allocated
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// for it. This avoids keeping garbage alive through that slot.
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desc->attrs |= JSPROP_SHARED;
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} else {
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// This is a method. Clone a function for it.
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if (!member->NewFunctionObject(ccx, iface, wnObject, &desc->value)) {
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JS_ReportError(cx, "Failed to clone function object for native function");
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return false;
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}
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// Without a wrapper the function would live on the prototype. Since we
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// don't have one, we have to avoid calling the scriptable helper's
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// GetProperty method for this property, so stub out the getter and
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// setter here explicitly.
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desc->getter = desc->setter = JS_PropertyStub;
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}
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// Define the property.
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return JS_DefinePropertyById(cx, holder, id, desc->value,
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desc->getter, desc->setter, desc->attrs);
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}
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static JSBool
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holder_enumerate(JSContext *cx, JSObject *holder)
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{
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// Ask the native wrapper for all its ids
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JSIdArray *ida = JS_Enumerate(cx, GetWrappedNativeObjectFromHolder(cx, holder));
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if (!ida)
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return false;
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// Resolve the underlying native properties onto the holder object
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jsid *idp = ida->vector;
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size_t length = ida->length;
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while (length-- > 0) {
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JSPropertyDescriptor dummy;
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if (!ResolveNativeProperty(cx, holder, *idp++, false, &dummy))
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return false;
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}
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return true;
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}
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struct NativePropertiesOnly : public Policy {
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static bool check(JSContext *cx, JSObject *obj, jsid id, bool set, Permission &perm);
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};
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2010-09-03 19:24:23 -07:00
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extern JSCrossCompartmentWrapper XrayWrapperWaivedWrapper;
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static JSBool
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wrappedJSObject_getter(JSContext *cx, JSObject *holder, jsid id, jsval *vp)
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{
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if (holder->isWrapper()) {
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#ifdef DEBUG
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{
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JSProxyHandler *handler = holder->getProxyHandler();
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NS_ASSERTION(handler == &XrayWrapper<JSCrossCompartmentWrapper>::singleton ||
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handler == &XrayWrapper<CrossOriginWrapper>::singleton,
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"bad object");
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}
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#endif
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holder = holder->unwrap();
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}
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2010-07-02 14:09:48 -07:00
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// If the caller intentionally waives the X-ray wrapper we usually
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// apply for wrapped natives, use a special wrapper to make sure the
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// membrane will not automatically apply an X-ray wrapper.
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JSObject *wn = GetWrappedNativeObjectFromHolder(cx, holder);
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2010-09-03 19:24:23 -07:00
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// We have to make sure that if we're wrapping an outer window, that
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// the .wrappedJSObject also wraps the outer window.
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OBJ_TO_OUTER_OBJECT(cx, wn);
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if (!wn)
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return false;
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JSObject *obj = JSWrapper::New(cx, wn, NULL, holder->getParent(), &XrayWrapperWaivedWrapper);
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if (!obj)
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return false;
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*vp = OBJECT_TO_JSVAL(obj);
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return true;
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}
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2010-09-02 16:02:51 -07:00
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template <typename Base>
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bool
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XrayWrapper<Base>::get(JSContext *cx, JSObject *wrapper, JSObject *receiver, jsid id,
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js::Value *vp)
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{
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return JSProxyHandler::get(cx, wrapper, receiver, id, vp);
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}
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template <typename Base>
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bool
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XrayWrapper<Base>::set(JSContext *cx, JSObject *wrapper, JSObject *receiver, jsid id,
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js::Value *vp)
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{
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return JSProxyHandler::set(cx, wrapper, receiver, id, vp);
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}
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2010-07-02 14:09:48 -07:00
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template <typename Base>
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bool
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2010-09-17 14:54:41 -07:00
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XrayWrapper<Base>::getPropertyDescriptor(JSContext *cx, JSObject *wrapper, jsid id,
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bool set, PropertyDescriptor *desc_in)
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{
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JSPropertyDescriptor *desc = Jsvalify(desc_in);
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if (id == nsXPConnect::GetRuntimeInstance()->GetStringID(XPCJSRuntime::IDX_WRAPPED_JSOBJECT)) {
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desc->obj = wrapper;
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desc->attrs = JSPROP_ENUMERATE|JSPROP_SHARED;
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desc->getter = wrappedJSObject_getter;
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desc->setter = NULL;
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desc->shortid = NULL;
|
|
|
|
desc->value = JSVAL_VOID;
|
|
|
|
return true;
|
|
|
|
}
|
2010-09-17 14:54:41 -07:00
|
|
|
if (!Base::getPropertyDescriptor(cx, wrapper, id, set, desc_in)) {
|
2010-07-02 14:09:48 -07:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
if (desc->obj)
|
|
|
|
return true;
|
|
|
|
return ResolveNativeProperty(cx, Base::wrappedObject(wrapper), id, false, desc);
|
|
|
|
}
|
|
|
|
|
|
|
|
template <typename Base>
|
|
|
|
bool
|
2010-09-17 14:54:41 -07:00
|
|
|
XrayWrapper<Base>::getOwnPropertyDescriptor(JSContext *cx, JSObject *wrapper, jsid id,
|
|
|
|
bool set, PropertyDescriptor *desc)
|
2010-07-02 14:09:48 -07:00
|
|
|
{
|
2010-09-17 14:54:41 -07:00
|
|
|
return getPropertyDescriptor(cx, wrapper, id, set, desc);
|
2010-07-02 14:09:48 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
template <typename Base>
|
|
|
|
bool
|
|
|
|
XrayWrapper<Base>::has(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
|
|
|
|
{
|
|
|
|
// Use the default implementation, which forwards to getPropertyDescriptor.
|
|
|
|
return JSProxyHandler::has(cx, wrapper, id, bp);
|
|
|
|
}
|
|
|
|
|
|
|
|
template <typename Base>
|
|
|
|
bool
|
|
|
|
XrayWrapper<Base>::hasOwn(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
|
|
|
|
{
|
|
|
|
// Use the default implementation, which forwards to getOwnPropertyDescriptor.
|
|
|
|
return JSProxyHandler::hasOwn(cx, wrapper, id, bp);
|
|
|
|
}
|
|
|
|
|
2010-09-02 16:02:51 -07:00
|
|
|
template <typename Base>
|
|
|
|
JSObject *
|
|
|
|
XrayWrapper<Base>::createHolder(JSContext *cx,
|
|
|
|
JSObject *parent,
|
|
|
|
JSObject *wrappedNative)
|
|
|
|
{
|
|
|
|
JSObject *holder = JS_NewObjectWithGivenProto(cx, &HolderClass, nsnull, parent);
|
|
|
|
if (!holder)
|
|
|
|
return nsnull;
|
|
|
|
|
|
|
|
holder->setSlot(JSSLOT_WN_OBJ, ObjectValue(*wrappedNative));
|
|
|
|
return holder;
|
|
|
|
}
|
|
|
|
|
|
|
|
template <typename Base>
|
|
|
|
JSObject *
|
|
|
|
XrayWrapper<Base>::unwrapHolder(JSContext *cx, JSObject *holder)
|
|
|
|
{
|
|
|
|
NS_ASSERTION(holder->getJSClass() == &HolderClass, "bad holder");
|
|
|
|
return GetWrappedNativeObjectFromHolder(cx, holder);
|
|
|
|
}
|
|
|
|
|
2010-07-02 14:09:48 -07:00
|
|
|
#define SJOW XrayWrapper<JSCrossCompartmentWrapper>
|
|
|
|
#define XOSJOW XrayWrapper<CrossOriginWrapper>
|
|
|
|
|
|
|
|
template <> SJOW SJOW::singleton(0);
|
|
|
|
template <> XOSJOW XOSJOW::singleton(0);
|
|
|
|
|
|
|
|
template class SJOW;
|
|
|
|
template class XOSJOW;
|
|
|
|
|
|
|
|
}
|