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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.
*/
#pragma once
#include <jsapi.h>
#include <string>
#include "mongo/scripting/mozjs/exception.h"
namespace mongo {
class BSONObj;
class BSONObjBuilder;
class BSONElement;
namespace mozjs {
class MozJSImplScope;
/**
* Wraps JSObject's with helpers for accessing their properties
*
* This wraps a RootedObject, so should only be allocated on the stack and is
* not movable or copyable
*/
class ObjectWrapper {
public:
/**
* Helper subclass that provides some easy boilerplate for accessing
* properties by string, index or id.
*/
class Key {
friend class ObjectWrapper;
enum class Type : char {
Field,
Index,
Id,
};
public:
Key(const char* field) : _field(field), _type(Type::Field) {}
Key(uint32_t idx) : _idx(idx), _type(Type::Index) {}
Key(JS::HandleId id) : _id(id), _type(Type::Id) {}
private:
void get(JSContext* cx, JS::HandleObject o, JS::MutableHandleValue value);
void set(JSContext* cx, JS::HandleObject o, JS::HandleValue value);
bool has(JSContext* cx, JS::HandleObject o);
void define(JSContext* cx, JS::HandleObject o, JS::HandleValue value, unsigned attrs);
void del(JSContext* cx, JS::HandleObject o);
std::string toString(JSContext* cx);
union {
const char* _field;
uint32_t _idx;
jsid _id;
};
Type _type;
};
/**
* The depth parameter here allows us to detect overly nested or circular
* objects and bail without blowing the stack.
*/
ObjectWrapper(JSContext* cx, JS::HandleObject obj, int depth = 0);
ObjectWrapper(JSContext* cx, JS::HandleValue value, int depth = 0);
double getNumber(Key key);
int getNumberInt(Key key);
long long getNumberLongLong(Key key);
std::string getString(Key key);
bool getBoolean(Key key);
BSONObj getObject(Key key);
void getValue(Key key, JS::MutableHandleValue value);
void setNumber(Key key, double val);
void setString(Key key, StringData val);
void setBoolean(Key key, bool val);
void setBSONElement(Key key, const BSONElement& elem, bool readOnly);
void setBSON(Key key, const BSONObj& obj, bool readOnly);
void setValue(Key key, JS::HandleValue value);
void setObject(Key key, JS::HandleObject value);
/**
* See JS_DefineProperty for what sort of attributes might be useful
*/
void defineProperty(Key key, JS::HandleValue value, unsigned attrs);
void deleteProperty(Key key);
/**
* Returns the bson type of the property
*/
int type(Key key);
void rename(Key key, const char* to);
bool hasField(Key key);
void callMethod(const char* name, const JS::HandleValueArray& args, JS::MutableHandleValue out);
void callMethod(const char* name, JS::MutableHandleValue out);
void callMethod(JS::HandleValue fun,
const JS::HandleValueArray& args,
JS::MutableHandleValue out);
void callMethod(JS::HandleValue fun, JS::MutableHandleValue out);
/**
* Safely enumerates fields in the object, invoking a callback for each id
*/
template <typename T>
void enumerate(T&& callback) {
JS::AutoIdArray ids(_context, JS_Enumerate(_context, _object));
if (!ids)
throwCurrentJSException(
_context, ErrorCodes::JSInterpreterFailure, "Failure to enumerate object");
JS::RootedId rid(_context);
for (size_t i = 0; i < ids.length(); ++i) {
rid.set(ids[i]);
callback(rid);
}
}
/**
* concatenates all of the fields in the object into the associated builder
*/
void writeThis(BSONObjBuilder* b);
JS::HandleObject thisv() {
return _object;
}
private:
/**
* writes the field "key" into the associated builder
*
* optional originalBSON is used to track updates to types (NumberInt
* overwritten by a float, but coercible to the original type, etc.)
*/
void _writeField(BSONObjBuilder* b, Key key, BSONObj* originalBSON);
JSContext* _context;
JS::RootedObject _object;
/**
* The depth of an object wrapper has to do with how many parents it has.
* Used to avoid circular object graphs and associate stack smashing.
*/
int _depth;
};
} // namespace mozjs
} // namespace mongo
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