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/**
* Copyright (C) 2020-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/exec/js_function.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/client.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/query/query_knobs_gen.h"
#include "mongo/scripting/engine.h"
namespace mongo {
namespace {
std::string getAuthenticatedUserNamesToken(Client* client) {
StringBuilder sb;
auto as = AuthorizationSession::get(client);
if (auto name = as->getAuthenticatedUserName()) {
// Using a NUL byte which isn't valid in usernames to separate them.
if (const auto& tenant = name->getTenant()) {
sb << '\0' << tenant->toString();
}
sb << '\0' << name->getUnambiguousName();
}
return sb.str();
}
} // namespace
JsFunction::JsFunction(OperationContext* opCtx, std::string code, std::string dbName) {
_init(opCtx, std::move(code), std::move(dbName));
}
JsFunction::JsFunction(const JsFunction& other) {
_init(Client::getCurrent()->getOperationContext(), other._code, other._dbName);
}
JsFunction& JsFunction::operator=(const JsFunction& other) {
if (this != &other) {
_init(Client::getCurrent()->getOperationContext(), other._code, other._dbName);
}
return *this;
}
void JsFunction::_init(OperationContext* opCtx, std::string code, std::string dbName) {
invariant(opCtx != nullptr);
uassert(6108304, "no globalScriptEngine in $where parsing", getGlobalScriptEngine());
uassert(6108305, "ns for $where cannot be empty", !dbName.empty());
_code = std::move(code);
_dbName = std::move(dbName);
const auto userToken = getAuthenticatedUserNamesToken(opCtx->getClient());
_scope = getGlobalScriptEngine()->getPooledScope(opCtx, _dbName, "where" + userToken);
const ScopeGuard guard([&] { _scope->unregisterOperation(); });
_func = _scope->createFunction(_code.c_str());
uassert(6108306, "$where compile error", _func);
}
bool JsFunction::runAsPredicate(const BSONObj& obj) const {
_scope->registerOperation(Client::getCurrent()->getOperationContext());
const ScopeGuard scopeOpCtxGuard([&] { _scope->unregisterOperation(); });
_scope->advanceGeneration();
_scope->setObject("obj", obj);
_scope->setBoolean("fullObject", true); // this is a hack b/c fullObject used to be relevant
auto err =
_scope->invoke(_func, nullptr, &obj, internalQueryJavaScriptFnTimeoutMillis.load(), false);
if (err == -3) { // INVOKE_ERROR
std::stringstream ss;
ss << "error on invocation of $where function:\n" << _scope->getError();
uassert(5038802, ss.str(), false);
} else if (err != 0) { // !INVOKE_SUCCESS
uassert(5038803, "unknown error in invocation of $where function", false);
}
return _scope->getBoolean("__returnValue");
}
size_t JsFunction::getApproximateSize() const {
// The memory pointed to by _scope is owned by the MozJS engine, so we do not account
// for the size of that memory here.
return sizeof(JsFunction);
}
} // namespace mongo
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