未通过护照连线req.user

Question

As the title says, wherever I try to call the req.user it outputs me an undefined object and cause a 500 Internal Server Error.
This is the code that I have so far (not all, just the interested part):

    app.use(cookieParser());
    app.use(bodyParser.urlencoded({ extended: true }));
    app.use(bodyParser.json());
    app.use(session({
        secret: 'keyboard cat',
        resave: false,
        saveUninitialized: true,
        cookie: { secure: true }
      })); //This was added as a second temptative
    app.use(passport.initialize());
    app.use(passport.session());


    // config
    passport.use('local', new LocalStrategy({
        usernameField: 'email',
        passwordField: 'pwd',
        session: false
    },
        function (username, password, done) {
            User.findOne({ email: username }, (err, usr) => {
                if (err) { return done(err); }
                // TODO: refactor for right error message handling as below!!
                if (!usr)
                    return done(null, false, { success: false, status: 403, message: 'Incorrect username.' });
                if (!usr.authenticate(password))
                    return done(null, false, { success: false, status: 403, message: 'Incorrect password.' });
                if (!usr.verified)
                    return done(null, false, { succes: false, status: 400, message: 'User not confirmed' });
                delete usr.salt;
                delete usr.password;
                return done(null, usr);
            });
        })
    );

passport.serializeUser(function (user, done) {
    const tempUser = Object.assign({}, { x: user.id, y: user.email, z: user.salt });
    done(null, user.id);
});

passport.deserializeUser(function (id, done) {
    console.warn(`WE DID IT`);
    User.findById(id, function (err, user) {
        console.log(`id in input ${id}`);
        console.log(`deserializing user ${user}`);
        done(err, user);
    });
});

:

exports.authenticate = (req, res) => {
  passport.authenticate('local', { session: false /*, failureCallback: failureCallback */}, (err, user, info) => {
    if (!err) {
      if (!user)
        res.json(info);
      else {
        var userCopy = Object.assign({}, user._doc);
        delete userCopy.password;
        delete userCopy.salt;
        delete userCopy.profilePicture;
        Activity.checkin.getActiveUserCheckin(userCopy._id, (err, activeCheckin) => {
          if(!err){
            if(!!activeCheckin) userCopy.activeCheckinOnStructure = activeCheckin.structureId;
            var token = jwt.sign(userCopy, require('../../secret'));
            res.send({ success: true, status: 200, token: token });
          }else{
            res.send({ success: false, status: 500, message: err });
          }
        });
      }
    }
  })(req, res);

};

Things that I tried: first of all, I tried to add an express-session (as you can see in the app.use(session) part) to add the Express' session. Then, I tried to set the user like this app.set("user", user) but it won't be good as I don't have access to the app variable in the point in which I call the method.
It looks to me that the configurations for the app.js part and the login part have been done in a good way and passport should automatically wire the req.user field but this, somehow, is not happening and I can't explain myself why is this happening.

Answer 1

The problem for this specific question was that the userSerializer was never invoked. Adding req.login solved the day

  passport.authenticate('local', { session: true /*, failureCallback: failureCallback */}, (err, user, info) => {
    if (!err) {
      if (!user)
        res.json(info);
      else {
        var userCopy = Object.assign({}, user._doc);
        delete userCopy.password;
        delete userCopy.salt;
        delete userCopy.profilePicture;
        Activity.checkin.getActiveUserCheckin(userCopy._id, (err, activeCheckin) => {
          if(!err){
            if(!!activeCheckin) userCopy.activeCheckinOnStructure = activeCheckin.structureId;
            var token = jwt.sign(userCopy, require('../../secret'));
            req.login(user, function(err) {
              if (err) {
                return res.status(401).json(err);
              } else {
                res.send({ success: true, status: 200, token: token });
              }
            });
          }else{
            res.send({ success: false, status: 500, message: err });
          }
        });
      }
    }
  })(req, res);

};