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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <jsapi.h>
#include "mongo/scripting/mozjs/implscope.h"
#include "mongo/scripting/mozjs/objectwrapper.h"
#include "mongo/scripting/mozjs/valuewriter.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/stringutils.h"
namespace mongo {
namespace mozjs {
namespace smUtils {
/**
* Returns true if "value" is an instance of any of the types passed as
* template parameters. Additionally sets isProto if the value is also the
* prototype for that type.
*
* We recurse until we hit the void specialization which we set up by adding
* void as the last type in wrapConstrainedMethod.
*/
template <typename T, typename... Args>
bool instanceOf(MozJSImplScope* scope, bool* isProto, JS::HandleValue value) {
auto& proto = scope->getProto<T>();
if (proto.instanceOf(value)) {
if (value.toObjectOrNull() == proto.getProto()) {
*isProto = true;
}
return true;
}
return instanceOf<Args...>(scope, isProto, value);
}
/**
* Terminating specialization for instanceOf.
*
* We use this to identify the end of the template list in the general case.
*/
template <>
inline bool instanceOf<void>(MozJSImplScope* scope, bool* isProto, JS::HandleValue value) {
return false;
}
/**
* Wraps a method with an additional check against a list of possible wrap types.
*
* Template Parameters:
* T - A type with
* ::call - a static function of type void (JSContext* cx, JS::CallArgs args)
* ::name - a static function which returns a const char* with the type name
* noProto - whether the method can be invoked on the prototype
* Args - The list of types to check against scope->getProto<T>().instanceOf
* for the thisv the method has been invoked against
*/
template <typename T, bool noProto, typename... Args>
bool wrapConstrainedMethod(JSContext* cx, unsigned argc, JS::Value* vp) {
try {
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
bool isProto = false;
if (!args.thisv().isObject()) {
uasserted(ErrorCodes::BadValue,
str::stream() << "Cannot call \"" << T::name()
<< "\" on non-object of type \""
<< ValueWriter(cx, args.thisv()).typeAsString()
<< "\"");
}
if (!instanceOf<Args..., void>(getScope(cx), &isProto, args.thisv())) {
uasserted(ErrorCodes::BadValue,
str::stream() << "Cannot call \"" << T::name() << "\" on object of type \""
<< ObjectWrapper(cx, args.thisv()).getClassName()
<< "\"");
}
if (noProto && isProto) {
uasserted(ErrorCodes::BadValue,
str::stream() << "Cannot call \"" << T::name() << "\" on prototype of \""
<< ObjectWrapper(cx, args.thisv()).getClassName()
<< "\"");
}
T::call(cx, args);
return true;
} catch (...) {
mongoToJSException(cx);
return false;
}
}
} // namespace smUtils
} // namespace mozjs
} // namespace mongo
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