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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/scripting/mozjs/bson.h"
#include <set>
#include "mongo/scripting/mozjs/idwrapper.h"
#include "mongo/scripting/mozjs/implscope.h"
#include "mongo/scripting/mozjs/objectwrapper.h"
#include "mongo/scripting/mozjs/valuereader.h"
#include "mongo/scripting/mozjs/valuewriter.h"
namespace mongo {
namespace mozjs {
const char* const BSONInfo::className = "BSON";
const JSFunctionSpec BSONInfo::freeFunctions[2] = {
MONGO_ATTACH_JS_FUNCTION(bsonWoCompare), JS_FS_END,
};
namespace {
/**
* Holder for bson objects which tracks state for the js wrapper
*
* Basically, we have read only and read/write variants, and a need to manage
* the appearance of mutable state on the read/write versions.
*/
struct BSONHolder {
BSONHolder(const BSONObj& obj, bool ro)
: _obj(obj.getOwned()), _resolved(false), _readOnly(ro), _altered(false) {}
BSONObj _obj;
bool _resolved;
bool _readOnly;
bool _altered;
std::set<std::string> _removed;
};
BSONHolder* getHolder(JSObject* obj) {
return static_cast<BSONHolder*>(JS_GetPrivate(obj));
}
} // namespace
void BSONInfo::make(JSContext* cx, JS::MutableHandleObject obj, BSONObj bson, bool ro) {
auto scope = getScope(cx);
scope->getProto<BSONInfo>().newObject(obj);
JS_SetPrivate(obj, new BSONHolder(bson, ro));
}
void BSONInfo::finalize(JSFreeOp* fop, JSObject* obj) {
auto holder = getHolder(obj);
if (!holder)
return;
delete holder;
}
void BSONInfo::enumerate(JSContext* cx, JS::HandleObject obj, JS::AutoIdVector& properties) {
auto holder = getHolder(obj);
if (!holder)
return;
BSONObjIterator i(holder->_obj);
ObjectWrapper o(cx, obj);
JS::RootedValue val(cx);
JS::RootedId id(cx);
while (i.more()) {
BSONElement e = i.next();
// TODO: when we get heterogenous set lookup, switch to StringData
// rather than involving the temporary string
if (holder->_removed.count(e.fieldName()))
continue;
ValueReader(cx, &val).fromStringData(e.fieldNameStringData());
if (!JS_ValueToId(cx, val, &id))
uasserted(ErrorCodes::JSInterpreterFailure, "Failed to invoke JS_ValueToId");
properties.append(id);
}
}
void BSONInfo::setProperty(
JSContext* cx, JS::HandleObject obj, JS::HandleId id, bool strict, JS::MutableHandleValue vp) {
auto holder = getHolder(obj);
if (holder) {
if (holder->_readOnly) {
uasserted(ErrorCodes::BadValue, "Read only object");
}
auto iter = holder->_removed.find(IdWrapper(cx, id).toString());
if (iter != holder->_removed.end()) {
holder->_removed.erase(iter);
}
holder->_altered = true;
}
ObjectWrapper(cx, obj).defineProperty(id, vp, JSPROP_ENUMERATE);
}
void BSONInfo::delProperty(JSContext* cx, JS::HandleObject obj, JS::HandleId id, bool* succeeded) {
auto holder = getHolder(obj);
if (holder) {
if (holder->_readOnly) {
uasserted(ErrorCodes::BadValue, "Read only object");
}
holder->_altered = true;
holder->_removed.insert(IdWrapper(cx, id).toString());
}
*succeeded = true;
}
void BSONInfo::resolve(JSContext* cx, JS::HandleObject obj, JS::HandleId id, bool* resolvedp) {
auto holder = getHolder(obj);
*resolvedp = false;
if (!holder) {
return;
}
IdWrapper idw(cx, id);
if (!holder->_readOnly && holder->_removed.count(idw.toString())) {
return;
}
ObjectWrapper o(cx, obj);
std::string sname = IdWrapper(cx, id).toString();
if (holder->_obj.hasField(sname)) {
auto elem = holder->_obj[sname];
JS::RootedValue vp(cx);
ValueReader(cx, &vp).fromBSONElement(elem, holder->_readOnly);
o.defineProperty(id, vp, JSPROP_ENUMERATE);
if (!holder->_readOnly && (elem.type() == mongo::Object || elem.type() == mongo::Array)) {
// if accessing a subobject, we have no way to know if
// modifications are being made on writable objects
holder->_altered = true;
}
*resolvedp = true;
}
}
std::tuple<BSONObj*, bool> BSONInfo::originalBSON(JSContext* cx, JS::HandleObject obj) {
std::tuple<BSONObj*, bool> out(nullptr, false);
if (auto holder = getHolder(obj))
out = std::make_tuple(&holder->_obj, holder->_altered);
return out;
}
void BSONInfo::Functions::bsonWoCompare::call(JSContext* cx, JS::CallArgs args) {
if (args.length() != 2)
uasserted(ErrorCodes::BadValue, "bsonWoCompare needs 2 argument");
if (!args.get(0).isObject())
uasserted(ErrorCodes::BadValue, "first argument to bsonWoCompare must be an object");
if (!args.get(1).isObject())
uasserted(ErrorCodes::BadValue, "second argument to bsonWoCompare must be an object");
BSONObj firstObject = ValueWriter(cx, args.get(0)).toBSON();
BSONObj secondObject = ValueWriter(cx, args.get(1)).toBSON();
args.rval().setInt32(firstObject.woCompare(secondObject));
}
void BSONInfo::postInstall(JSContext* cx, JS::HandleObject global, JS::HandleObject proto) {
JS::RootedValue value(cx);
value.setBoolean(true);
ObjectWrapper(cx, proto).defineProperty("_bson", value, 0);
}
} // namespace mozjs
} // namespace mongo
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