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// dbeval.cpp

/**
*    Copyright (C) 2012 10gen 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::kCommand

#include "mongo/platform/basic.h"

#include "mongo/bson/util/builder.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_manager_global.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/introspect.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/json.h"
#include "mongo/db/operation_context.h"
#include "mongo/scripting/engine.h"
#include "mongo/util/log.h"

namespace mongo {

    using std::unique_ptr;
    using std::dec;
    using std::endl;
    using std::string;
    using std::stringstream;

namespace {

    const int edebug=0;

    bool dbEval(OperationContext* txn,
                const string& dbName,
                const BSONObj& cmd,
                BSONObjBuilder& result,
                string& errmsg) {

        RARELY {
            warning() << "the eval command is deprecated" << startupWarningsLog;
        }

        const BSONElement e = cmd.firstElement();
        uassert(10046,
                "eval needs Code",
                e.type() == Code || e.type() == CodeWScope || e.type() == String);

        const char *code = 0;
        switch ( e.type() ) {
        case String:
        case Code:
            code = e.valuestr();
            break;
        case CodeWScope:
            code = e.codeWScopeCode();
            break;
        default:
            verify(0);
        }

        verify(code);

        if (!globalScriptEngine) {
            errmsg = "db side execution is disabled";
            return false;
        }

        unique_ptr<Scope> s(globalScriptEngine->newScope());
        s->registerOperation(txn);

        ScriptingFunction f = s->createFunction(code);
        if (f == 0) {
            errmsg = string("compile failed: ") + s->getError();
            return false;
        }

        s->localConnectForDbEval(txn, dbName.c_str());

        if (e.type() == CodeWScope) {
            s->init(e.codeWScopeScopeDataUnsafe());
        }

        BSONObj args;
        {
            BSONElement argsElement = cmd.getField("args");
            if ( argsElement.type() == Array ) {
                args = argsElement.embeddedObject();
                if ( edebug ) {
                    log() << "args:" << args.toString() << endl;
                    log() << "code:\n" << code << endl;
                }
            }
        }

        int res;
        {
            Timer t;
            res = s->invoke(f, &args, 0, 0);
            int m = t.millis();
            if (m > serverGlobalParams.slowMS) {
                log() << "dbeval slow, time: " << dec << m << "ms " << dbName << endl;
                if ( m >= 1000 ) log() << code << endl;
                else OCCASIONALLY log() << code << endl;
            }
        }

        if (res || s->isLastRetNativeCode()) {
            result.append("errno", (double) res);
            errmsg = "invoke failed: ";
            if (s->isLastRetNativeCode())
                errmsg += "cannot return native function";
            else
                errmsg += s->getError();

            return false;
        }

        s->append(result, "retval", "__returnValue");

        return true;
    }


    class CmdEval : public Command {
    public:
        virtual bool slaveOk() const {
            return false;
        }

        virtual void help(stringstream &help) const {
            help << "DEPRECATED\n"
                 << "Evaluate javascript at the server.\n"
                 << "http://dochub.mongodb.org/core/serversidecodeexecution";
        }
        virtual bool isWriteCommandForConfigServer() const { return false; }
        virtual void addRequiredPrivileges(const std::string& dbname,
                                           const BSONObj& cmdObj,
                                           std::vector<Privilege>* out) {

            RoleGraph::generateUniversalPrivileges(out);
        }

        CmdEval() : Command("eval", false, "$eval") { }

        bool run(OperationContext* txn,
                 const string& dbname,
                 BSONObj& cmdObj,
                 int options,
                 string& errmsg,
                 BSONObjBuilder& result) {

            if (cmdObj["nolock"].trueValue()) {
                return dbEval(txn, dbname, cmdObj, result, errmsg);
            }

            ScopedTransaction transaction(txn, MODE_X);
            Lock::GlobalWrite lk(txn->lockState());

            OldClientContext ctx(txn, dbname);

            return dbEval(txn, dbname, cmdObj, result, errmsg);
        }

    } cmdeval;

} // namespace
} // namespace mongo