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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kQuery
#include "mongo/platform/basic.h"
#include "mongo/scripting/mozjs/valuereader.h"
#include <cmath>
#include <cstdio>
#include <js/CharacterEncoding.h>
#include <js/Date.h>
#include "mongo/base/error_codes.h"
#include "mongo/platform/decimal128.h"
#include "mongo/scripting/mozjs/implscope.h"
#include "mongo/scripting/mozjs/objectwrapper.h"
#include "mongo/util/base64.h"
#include "mongo/util/log.h"
namespace mongo {
namespace mozjs {
ValueReader::ValueReader(JSContext* cx, JS::MutableHandleValue value)
: _context(cx), _value(value) {}
void ValueReader::fromBSONElement(const BSONElement& elem, const BSONObj& parent, bool readOnly) {
auto scope = getScope(_context);
switch (elem.type()) {
case mongo::Code:
// javascriptProtection prevents Code and CodeWScope BSON types from
// being automatically marshalled into executable functions.
if (scope->isJavaScriptProtectionEnabled()) {
JS::AutoValueArray<1> args(_context);
ValueReader(_context, args[0]).fromStringData(elem.valueStringData());
JS::RootedObject obj(_context);
scope->getProto<CodeInfo>().newInstance(args, _value);
} else {
scope->newFunction(elem.valueStringData(), _value);
}
return;
case mongo::CodeWScope:
if (scope->isJavaScriptProtectionEnabled()) {
JS::AutoValueArray<2> args(_context);
ValueReader(_context, args[0]).fromStringData(elem.codeWScopeCode());
ValueReader(_context, args[1]).fromBSON(elem.codeWScopeObject(), nullptr, readOnly);
scope->getProto<CodeInfo>().newInstance(args, _value);
} else {
if (!elem.codeWScopeObject().isEmpty())
warning() << "CodeWScope doesn't transfer to db.eval";
scope->newFunction(StringData(elem.codeWScopeCode(), elem.codeWScopeCodeLen() - 1),
_value);
}
return;
case mongo::Symbol:
case mongo::String:
fromStringData(elem.valueStringData());
return;
case mongo::jstOID: {
OIDInfo::make(_context, elem.OID(), _value);
return;
}
case mongo::NumberDouble:
fromDouble(elem.Number());
return;
case mongo::NumberInt:
_value.setInt32(elem.Int());
return;
case mongo::Array: {
fromBSONArray(elem.embeddedObject(), &parent, readOnly);
return;
}
case mongo::Object:
fromBSON(elem.embeddedObject(), &parent, readOnly);
return;
case mongo::Date:
_value.setObjectOrNull(
JS::NewDateObject(_context, JS::TimeClip(elem.Date().toMillisSinceEpoch())));
return;
case mongo::Bool:
_value.setBoolean(elem.Bool());
return;
case mongo::jstNULL:
_value.setNull();
return;
case mongo::EOO:
case mongo::Undefined:
_value.setUndefined();
return;
case mongo::RegEx: {
// TODO parse into a custom type that can support any patterns and flags SERVER-9803
JS::AutoValueArray<2> args(_context);
ValueReader(_context, args[0]).fromStringData(elem.regex());
ValueReader(_context, args[1]).fromStringData(elem.regexFlags());
JS::RootedObject obj(_context);
scope->getProto<RegExpInfo>().newInstance(args, &obj);
_value.setObjectOrNull(obj);
return;
}
case mongo::BinData: {
int len;
const char* data = elem.binData(len);
std::stringstream ss;
base64::encode(ss, data, len);
JS::AutoValueArray<2> args(_context);
args[0].setInt32(elem.binDataType());
ValueReader(_context, args[1]).fromStringData(ss.str());
scope->getProto<BinDataInfo>().newInstance(args, _value);
return;
}
case mongo::bsonTimestamp: {
JS::AutoValueArray<2> args(_context);
ValueReader(_context, args[0])
.fromDouble(elem.timestampTime().toMillisSinceEpoch() / 1000);
ValueReader(_context, args[1]).fromDouble(elem.timestampInc());
scope->getProto<TimestampInfo>().newInstance(args, _value);
return;
}
case mongo::NumberLong: {
JS::RootedObject thisv(_context);
scope->getProto<NumberLongInfo>().newObject(&thisv);
JS_SetPrivate(thisv, scope->trackedNew<int64_t>(elem.numberLong()));
_value.setObjectOrNull(thisv);
return;
}
case mongo::NumberDecimal: {
Decimal128 decimal = elem.numberDecimal();
JS::AutoValueArray<1> args(_context);
ValueReader(_context, args[0]).fromDecimal128(decimal);
JS::RootedObject obj(_context);
scope->getProto<NumberDecimalInfo>().newInstance(args, &obj);
_value.setObjectOrNull(obj);
return;
}
case mongo::MinKey:
scope->getProto<MinKeyInfo>().newInstance(_value);
return;
case mongo::MaxKey:
scope->getProto<MaxKeyInfo>().newInstance(_value);
return;
case mongo::DBRef: {
JS::AutoValueArray<1> oidArgs(_context);
ValueReader(_context, oidArgs[0]).fromStringData(elem.dbrefOID().toString());
JS::AutoValueArray<2> dbPointerArgs(_context);
ValueReader(_context, dbPointerArgs[0]).fromStringData(elem.dbrefNS());
scope->getProto<OIDInfo>().newInstance(oidArgs, dbPointerArgs[1]);
scope->getProto<DBPointerInfo>().newInstance(dbPointerArgs, _value);
return;
}
default:
massert(16661,
str::stream() << "can't handle type: " << elem.type() << " " << elem.toString(),
false);
break;
}
_value.setUndefined();
}
void ValueReader::fromBSON(const BSONObj& obj, const BSONObj* parent, bool readOnly) {
JS::RootedObject child(_context);
bool filledDBRef = false;
if (obj.firstElementType() == String && str::equals(obj.firstElementFieldName(), "$ref")) {
BSONObjIterator it(obj);
it.next();
const BSONElement id = it.next();
if (id.ok() && str::equals(id.fieldName(), "$id")) {
DBRefInfo::make(_context, &child, obj, parent, readOnly);
filledDBRef = true;
}
}
if (!filledDBRef) {
BSONInfo::make(_context, &child, obj, parent, readOnly);
}
_value.setObjectOrNull(child);
}
void ValueReader::fromBSONArray(const BSONObj& obj, const BSONObj* parent, bool readOnly) {
JS::AutoValueVector avv(_context);
BSONForEach(elem, obj) {
JS::RootedValue member(_context);
ValueReader(_context, &member).fromBSONElement(elem, parent ? *parent : obj, readOnly);
if (!avv.append(member)) {
uasserted(ErrorCodes::JSInterpreterFailure, "Failed to append to JS array");
}
}
JS::RootedObject array(_context, JS_NewArrayObject(_context, avv));
if (!array) {
uasserted(ErrorCodes::JSInterpreterFailure, "Failed to JS_NewArrayObject");
}
_value.setObjectOrNull(array);
}
/**
* SpiderMonkey doesn't have a direct entry point to create a jsstring from
* utf8, so we have to flow through some slightly less public interfaces.
*
* Basically, we have to use their routines to convert to utf16, then assign
* those bytes with JS_NewUCStringCopyN
*/
void ValueReader::fromStringData(StringData sd) {
size_t utf16Len;
// TODO: we have tests that involve dropping garbage in. Do we want to
// throw, or to take the lossy conversion?
auto utf16 = JS::LossyUTF8CharsToNewTwoByteCharsZ(
_context, JS::UTF8Chars(sd.rawData(), sd.size()), &utf16Len);
mozilla::UniquePtr<char16_t, JS::FreePolicy> utf16Deleter(utf16.get());
uassert(ErrorCodes::JSInterpreterFailure,
str::stream() << "Failed to encode \"" << sd << "\" as utf16",
utf16);
auto jsStr = JS_NewUCStringCopyN(_context, utf16.get(), utf16Len);
uassert(ErrorCodes::JSInterpreterFailure,
str::stream() << "Unable to copy \"" << sd << "\" into MozJS",
jsStr);
_value.setString(jsStr);
}
/**
* SpiderMonkey doesn't have a direct entry point to create a Decimal128
*
* Read NumberDecimal as a string
* Note: This prevents shell arithmetic, which is performed for number longs
* by converting them to doubles, which is imprecise. Until there is a better
* method to handle non-double shell arithmetic, decimals will remain
* as a non-numeric js type.
*/
void ValueReader::fromDecimal128(Decimal128 decimal) {
NumberDecimalInfo::make(_context, _value, decimal);
}
/**
* SpiderMonkey has a nasty habit of interpreting certain NaN patterns as other boxed types (it
* assumes that only one kind of NaN exists in JS, rather than the full ieee754 spectrum). Thus we
* have to flow all double setting through a wrapper which ensures that nan's are coerced to the
* canonical javascript NaN.
*
* See SERVER-24054 for more details.
*/
void ValueReader::fromDouble(double d) {
if (std::isnan(d)) {
_value.set(JS_GetNaNValue(_context));
} else {
_value.setDouble(d);
}
}
} // namespace mozjs
} // namespace mongo
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