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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/matcher/expression_where.h"
#include <memory>
#include "mongo/base/init.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/client.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_parser.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/query/query_knobs_gen.h"
#include "mongo/scripting/engine.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using std::string;
using std::stringstream;
using std::unique_ptr;
namespace {
std::string getAuthenticatedUserNamesToken(Client* client) {
StringBuilder sb;
auto as = AuthorizationSession::get(client);
for (auto nameIter = as->getAuthenticatedUserNames(); nameIter.more(); nameIter.next()) {
// Using a NUL byte which isn't valid in usernames to separate them.
sb << '\0' << nameIter->getUnambiguousName();
}
return sb.str();
}
} // namespace
WhereMatchExpression::WhereMatchExpression(OperationContext* opCtx,
WhereParams params,
StringData dbName)
: WhereMatchExpressionBase(std::move(params)), _dbName(dbName.toString()), _opCtx(opCtx) {
invariant(_opCtx != nullptr);
uassert(
ErrorCodes::BadValue, "no globalScriptEngine in $where parsing", getGlobalScriptEngine());
uassert(ErrorCodes::BadValue, "ns for $where cannot be empty", dbName.size() != 0);
const auto userToken = getAuthenticatedUserNamesToken(opCtx->getClient());
_scope = getGlobalScriptEngine()->getPooledScope(_opCtx, _dbName, "where" + userToken);
const auto guard = makeGuard([&] { _scope->unregisterOperation(); });
_func = _scope->createFunction(getCode().c_str());
uassert(ErrorCodes::BadValue, "$where compile error", _func);
}
bool WhereMatchExpression::matches(const MatchableDocument* doc, MatchDetails* details) const {
uassert(28692, "$where compile error", _func);
BSONObj obj = doc->toBSON();
_scope->registerOperation(Client::getCurrent()->getOperationContext());
const auto guard = makeGuard([&] { _scope->unregisterOperation(); });
_scope->advanceGeneration();
_scope->setObject("obj", const_cast<BSONObj&>(obj));
_scope->setBoolean("fullObject", true); // this is a hack b/c fullObject used to be relevant
int err =
_scope->invoke(_func, nullptr, &obj, internalQueryJavaScriptFnTimeoutMillis.load(), false);
if (err == -3) { // INVOKE_ERROR
stringstream ss;
ss << "error on invocation of $where function:\n" << _scope->getError();
uassert(16812, ss.str(), false);
} else if (err != 0) { // ! INVOKE_SUCCESS
uassert(16813, "unknown error in invocation of $where function", false);
}
return _scope->getBoolean("__returnValue") != 0;
}
unique_ptr<MatchExpression> WhereMatchExpression::shallowClone() const {
WhereParams params;
params.code = getCode();
unique_ptr<WhereMatchExpression> e =
std::make_unique<WhereMatchExpression>(_opCtx, std::move(params), _dbName);
if (getTag()) {
e->setTag(getTag()->clone());
}
return e;
}
} // namespace mongo
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