server.js

const express = require('express');
const hbs = require('hbs');
const fs = require('fs');
const _ = require('lodash');
const cors = require('cors');

var bodyParser = require('body-parser');

const port = process.env.PORT || 3100;
var app = express();


app.set('view engine', 'hbs');

app.use(cors());
app.use(bodyParser.json());
app.use(express.static(__dirname + '/public'));
app.use((req, res, next) => {
    var now = new Date().toString();
    var log = `${now}: ${req.method} : ${req.url}`;
    console.log(log);
    fs.appendFile('server.log', log + '\n', (err) => {
        if (err)
            console.log(' ERROR MESSAGE::111 ', err);
    });
    next();
});

// app.use((req, res, next) => {
//     res.render('mantainance.hbs', {
//         message: 'be right back;;',
//         page: 'mantainance',

//     });
// });


hbs.registerPartials(__dirname + '/views/partials');
hbs.registerHelper('getCurrentYear', () => {
    return new Date().getFullYear();
});
hbs.registerHelper('screamIt', (text) => {
    return text.toUpperCase();
})



///////////////////////////////////////////////User//////
let UserFakeDB = [
    { username: 'frank', password: 'hello', token: 'frank123' },
    { username: 'truc', password: 'hello', token: '' },
    { username: 'quyen', password: 'hello', token: '' }
];

let authenticate = (req, res, next) => {
    console.log('----------------------------------==', req.header('x-authFrank'));
    let token = req.header('x-authFrank');

    let user = UserFakeDB.filter(x => x.token === token);
    if (!user) return res.status(401).send(' authenticate required!!!');
    req.user = user;
    req.token = token;
    next();

};

generateMyAuthToken = function (username) {
    var access = 'authFrank';
    var token = username + '123';

    let index = UserFakeDB.findIndex(u => u.username === username);

    UserFakeDB[index].token = token;
    return token;
}

removeToken = function (username, token) {
    return _.remove(UserFakeDB.filter(u => u == username).map(x => x.tokens), token);
}
////////////////////////////////////////////////////////////////////////////////////////


app.get('/', (req, res) => {

    res.render('home.hbs', {
        page: 'home page',
        message: 'welcome to home page',
        currentYear: new Date().getFullYear()
    });
});

app.get('/about', (req, res) => {
    res.render('about.hbs', {
        page: 'About page',
        message: ' message about page',
        currentYear: new Date().getFullYear()
    });
});

app.get('/projects', (req, res) => {
    res.render('projects.hbs', {
        page: 'projects page',
        message: ' message about projects',
        currentYear: new Date().getFullYear()
    });
});


app.get('/bad', (req, res) => {
    res.send({ errorMessage: 'this is a message' });
});


////////////// ng2-fundamental ///////////////////////////////
app.get('/api/events', (req, res) => {
    res.send(EVENTS);
});

app.get('/api/events/:id', (req, res) => {
    var id = +req.params.id;
    var result;
    result = EVENTS.find(event => event.id === id);
    // if (!result) return res.status(404).send('Id not found');
    res.send(result);
});

app.post('/api/events', (req, res) => {
    var event = req.body;
    if (event.id) {
        let index = EVENTS.findIndex(x => x.id == event.id);
        EVENTS[index] = event;
        res.status(200).send(event);
    } else {
        event.id = EVENTS.length + 1;
        event.sessions = [];
        if (event.name) {
            EVENTS.push(event);
            res.status(200).send(event);
        }
    }

    res.status(400).send('invalid event');
    //  console.log(' POST /events: ', req.body);
    //res.send(JSON.stringify(EVENTS));

});

app.get('/api/sessions/search', (req, res) => {
    let search = req.query.search.toLocaleLowerCase();
    let results = [];
    let matchingSessions = [];
    EVENTS.forEach(event => {
        matchingSessions = event.sessions.filter(session => session.name.toLocaleLowerCase().indexOf(search) > -1)

        matchingSessions = matchingSessions.map((session) => {
            session.eventId = event.id;
            return session;
        })
        results = results.concat(matchingSessions)
    });
    res.send(results);
})

app.post('/api/events/:eventId/sessions/:sessionId/voters/:voter', (req, res) => {
    let eventId = req.params.eventId;
    let sessionId = req.params.sessionId;
    let voter = req.params.voter;
    let eventIndex = EVENTS.findIndex(x => x.id == eventId);
    let sessionIndex = EVENTS[eventIndex].sessions.findIndex(x => x.id == sessionId);

    let voters = EVENTS[eventIndex].sessions[sessionIndex].voters
    let voterExist = voters.findIndex(x => x == voter);
    console.log('voter exists', voterExist)
    if (voterExist == -1) {
        voters.push(voter);
    }

    res.sendStatus(200);
});

app.delete('/api/events/:eventId/sessions/:sessionId/voters/:voter', (req, res) => {
    let eventId = req.params.eventId;
    let sessionId = req.params.sessionId;
    let voter = req.params.voter;
    let eventIndex = EVENTS.findIndex(x => x.id == eventId);
    let sessionIndex = EVENTS[eventIndex].sessions.findIndex(x => x.id == sessionId);

    let voters = EVENTS[eventIndex].sessions[sessionIndex].voters.filter(v => v != voter);
    EVENTS[eventIndex].sessions[sessionIndex].voters = voters;
    res.sendStatus(200);
});

app.get('/api/currentIdentity', authenticate, (req, res) => {
    console.log('api/currentIden ', req.user);
    res.send(req.user);
});

app.post('/api/login', (req, res) => {
    console.log('api/login', req.body);
    let username = req.body.username;
    let password = req.body.password;

    let user = UserFakeDB.filter(x => x.username === username && x.password === password);
    if (user) {
        const token = generateMyAuthToken(username);
        res.header('x-authFrank', token).send(user);
    }
    res.status(401).send('wrong..');

});

app.put('/api/users/:username', (req, res) => {
    let username = req.params.username;
    let index = UserFakeDB.findIndex(x => x.username === username);
    UserFakeDB[index].firstName = req.body.firstName;
    UserFakeDB[index].lastName = req.body.lastName;

});

app.post('/api/logout', (req, res) => {
    let username = req.body.username;

    let index = UserFakeDB.findIndex(x => x.username === username);

    UserFakeDB[index].token = '';
    console.log('logout:', username);
    res.header('x-authFrank', '').send(username + ' logged out');
});

///////////////////////////////////////////

app.listen(port, () => {
    console.log(`server is up on port: ${port}`);
});



const EVENTS = [
    {
        id: 1,
        name: 'Angular Connect',
        date: new Date('9/26/2036'),
        time: '10:00 am',
        price: 599.99,
        imageUrl: '/assets/images/angularconnect-shield.png',
        location: {
            address: '1057 DT',
            city: 'London',
            country: 'England'
        },
        sessions: [
            {
                id: 1,
                name: "Using Angular 4 Pipes",
                presenter: "Peter Bacon Darwin",
                duration: 1,
                level: "Intermediate",
                abstract: `Learn all about the new pipes in Angular 4, both 
          how to write them, and how to get the new AI CLI to write 
          them for you. Given by the famous PBD, president of Angular 
          University (formerly Oxford University)`,
                voters: ['bradgreen', 'igorminar', 'martinfowler']
            },
            {
                id: 2,
                name: "Getting the most out of your dev team",
                presenter: "Jeff Cross",
                duration: 1,
                level: "Intermediate",
                abstract: `We all know that our dev teams work hard, but with 
          the right management they can be even more productive, without 
          overworking them. In this session I'll show you how to get the 
          best results from the talent you already have on staff.`,
                voters: ['johnpapa', 'bradgreen', 'igorminar', 'martinfowler']
            },
            {
                id: 3,
                name: "Angular 4 Performance Metrics",
                presenter: "Rob Wormald",
                duration: 2,
                level: "Advanced",
                abstract: `Angular 4 Performance is hot. In this session, we'll see 
          how Angular gets such great performance by preloading data on 
          your users devices before they even hit your site using the 
          new predictive algorithms and thought reading software 
          built into Angular 4.`,
                voters: []
            },
            {
                id: 4,
                name: "Angular 5 Look Ahead",
                presenter: "Brad Green",
                duration: 2,
                level: "Advanced",
                abstract: `Even though Angular 5 is still 6 years away, we all want 
          to know all about it so that we can spend endless hours in meetings 
          debating if we should use Angular 4 or not. This talk will look at 
          Angular 6 even though no code has yet been written for it. We'll 
          look at what it might do, and how to convince your manager to 
          hold off on any new apps until it's released`,
                voters: []
            },
            {
                id: 5,
                name: "Basics of Angular 4",
                presenter: "John Papa",
                duration: 2,
                level: "Beginner",
                abstract: `It's time to learn the basics of Angular 4. This talk 
          will give you everything you need to know about Angular 4 to 
          get started with it today and be building UI's for your self 
          driving cars and butler-bots in no time.`,
                voters: ['bradgreen', 'igorminar']
            }
        ]
    },
    {
        id: 2,
        name: 'ng-nl',
        date: new Date('4/15/2037'),
        time: '9:00 am',
        price: 950.00,
        imageUrl: '/assets/images/ng-nl.png',
        onlineUrl: 'http://ng-nl.org/',

        sessions: [
            {
                id: 1,
                name: "Testing Angular 4 Workshop",
                presenter: "Pascal Precht & Christoph Bergdorf",
                duration: 4,
                level: "Beginner",
                abstract: `In this 6 hour workshop you will learn not only how to test Angular 4, 
          you will also learn how to make the most of your team's efforts. Other topics
          will be convincing your manager that testing is a good idea, and using the new
          protractor tool for end to end testing.`,
                voters: ['bradgreen', 'igorminar']
            },
            {
                id: 2,
                name: "Angular 4 and Firebase",
                presenter: "David East",
                duration: 3,
                level: "Intermediate",
                abstract: `In this workshop, David East will show you how to use Angular with the new
          ultra-real-time 5D Firebase back end, hosting platform, and wine recommendation engine.`,
                voters: ['bradgreen', 'igorminar', 'johnpapa']
            },
            {
                id: 3,
                name: "Reading the Angular 4 Source",
                presenter: "Patrick Stapleton",
                duration: 2,
                level: "Intermediate",
                abstract: `Angular 4's source code may be over 25 million lines of code, but it's really 
          a lot easier to read and understand then you may think. Patrick Stapleton will talk
          about his secretes for keeping up with the changes, and navigating around the code.`,
                voters: ['martinfowler']
            },
            {
                id: 4,
                name: "Hail to the Lukas",
                presenter: "Lukas Ruebbelke",
                duration: 1,
                level: "Beginner",
                abstract: `In this session, Lukas will present the 
          secret to being awesome, and how he became the President 
          of the United States through his amazing programming skills, 
          showing how you too can be success with just attitude.`,
                voters: ['bradgreen']
            },
        ]
    },
    {
        id: 3,
        name: 'ng-conf 2037',
        date: new Date('5/4/2037'),
        time: '9:00 am',
        price: 759.00,
        imageUrl: '/assets/images/ng-conf.png',
        location: {
            address: 'The Palatial America Hotel',
            city: 'Salt Lake City',
            country: 'USA'
        },
        sessions: [
            {
                id: 1,
                name: "How Elm Powers Angular 4",
                presenter: "Murphy Randle",
                duration: 2,
                level: "Intermediate",
                abstract: `We all know that Angular is written in Elm, but did you
          know how the source code is really written? In this exciting look
          into the internals of Angular 4, we'll see exactly how Elm powers
          the framework, and what you can do to take advantage of this knowledge.`,
                voters: ['bradgreen', 'martinfowler', 'igorminar']
            },
            {
                id: 2,
                name: "Angular and React together",
                presenter: "Jamison Dance",
                duration: 2,
                level: "Intermediate",
                abstract: `React v449.6 has just been released. Let's see how to use 
          this new version with Angular to create even more impressive applications.`,
                voters: ['bradgreen', 'martinfowler']
            },
            {
                id: 3,
                name: "Redux Woes",
                presenter: "Rob Wormald",
                duration: 1,
                level: "Intermediate",
                abstract: `Everyone is using Redux for everything from Angular to React to 
          Excel macros, but you're still having trouble grasping it? We'll take a look
          at how farmers use Redux when harvesting grain as a great introduction to 
          this game changing technology.`,
                voters: ['bradgreen', 'martinfowler', 'johnpapa']
            },
            {
                id: 4,
                name: "ng-wat again!!",
                presenter: "Shai Reznik",
                duration: 1,
                level: "Beginner",
                abstract: `Let's take a look at some of the stranger pieces of Angular 4,
          including neural net nets, Android in Androids, and using pipes with actual pipes.`,
                voters: ['bradgreen', 'martinfowler', 'igorminar', 'johnpapa']
            },
            {
                id: 5,
                name: "Dressed for Success",
                presenter: "Ward Bell",
                duration: 2,
                level: "Beginner",
                abstract: `Being a developer in 2037 is about more than just writing bug-free code. 
          You also have to look the part. In this amazing expose, Ward will talk you through
          how to pick out the right clothes to make your coworkers and boss not only
          respect you, but also want to be your buddy.`,
                voters: ['bradgreen', 'martinfowler']
            },
            {
                id: 6,
                name: "These aren't the directives you're looking for",
                presenter: "John Papa",
                duration: 2,
                level: "Intermediate",
                abstract: `Coinciding with the release of Star Wars Episode 18, this talk will show how
          to use directives in your Angular 4 development while drawing lessons from the new movie,
          featuring all your favorite characters like Han Solo's ghost and Darth Jar Jar.`,
                voters: ['bradgreen', 'martinfowler']
            },
        ]
    },
    {
        id: 4,
        name: 'UN Angular Summit',
        date: new Date('6/10/2037'),
        time: '8:00 am',
        price: 800.00,
        imageUrl: '/assets/images/basic-shield.png',
        location: {
            address: 'The UN Angular Center',
            city: 'New York',
            country: 'USA'
        },
        sessions: [
            {
                id: 1,
                name: "Diversity in Tech",
                presenter: "Sir Dave Smith",
                duration: 2,
                level: "Beginner",
                abstract: `Yes, we all work with cyborgs and androids and Martians, but 
          we probably don't realize that sometimes our internal biases can make it difficult for
          these well-designed coworkers to really feel at home coding alongside us. This talk will
          look at things we can do to recognize our biases and counteract them.`,
                voters: ['bradgreen', 'igorminar']
            },
            {
                id: 2,
                name: "World Peace and Angular",
                presenter: "US Secretary of State Zach Galifianakis",
                duration: 2,
                level: "Beginner",
                abstract: `Angular has been used in most of the major peace brokering that has
          happened in the last decade, but there is still much we can do to remove all
          war from the world, and Angular will be a key part of that effort.`,
                voters: ['bradgreen', 'igorminar', 'johnpapa']
            },
            {
                id: 3,
                name: "Using Angular with Androids",
                presenter: "Dan Wahlin",
                duration: 3,
                level: "Advanced",
                abstract: `Androids may do everything for us now, allowing us to spend all day playing 
          the latest Destiny DLC, but we can still improve the massages they give and the handmade
          brie they make using Angular 4. This session will show you how.`,
                voters: ['igorminar', 'johnpapa']
            },
        ]
    },
    {
        id: 5,
        name: 'ng-vegas',
        date: new Date('2/10/2037'),
        time: '9:00 am',
        price: 400.00,
        imageUrl: '/assets/images/ng-vegas.png',
        location: {
            address: 'The Excalibur',
            city: 'Las Vegas',
            country: 'USA'
        },
        sessions: [
            {
                id: 1,
                name: "Gambling with Angular",
                presenter: "John Papa",
                duration: 1,
                level: "Intermediate",
                abstract: `No, this talk isn't about slot machines. We all know that 
          Angular is used in most waiter-bots and coke vending machines, but
          did you know that was also used to write the core engine in the majority
          of voting machines? This talk will look at how all presidential elections
          are now determined by Angular code.`,
                voters: ['bradgreen', 'igorminar']
            },
            {
                id: 2,
                name: "Angular 4 in 60ish Minutes",
                presenter: "Dan Wahlin",
                duration: 2,
                level: "Beginner",
                abstract: `Get the skinny on Angular 4 for anyone new to this great new technology.
          Dan Wahlin will show you how you can get started with Angular in 60ish minutes, 
          guaranteed!`,
                voters: ['bradgreen', 'igorminar', 'johnpapa']
            }
        ]
    }
]




/////////////////////////////////
/**
 * Traverses a javascript object, and deletes all circular values
 * @param source object to remove circular references from
 * @param censoredMessage optional: what to put instead of censored values
 * @param censorTheseItems should be kept null, used in recursion
 * @returns {undefined}
 */
function preventCircularJson(source, censoredMessage, censorTheseItems) {
    //init recursive value if this is the first call
    censorTheseItems = censorTheseItems || [source];
    //default if none is specified
    censoredMessage = censoredMessage || "CIRCULAR_REFERENCE_REMOVED";
    //values that have allready apeared will be placed here:
    var recursiveItems = {};
    //initaite a censored clone to return back
    var ret = {};
    //traverse the object:
    for (var key in source) {
        var value = source[key]
        if (typeof value == "object") {
            //re-examine all complex children again later:
            recursiveItems[key] = value;
        } else {
            //simple values copied as is
            ret[key] = value;
        }
    }
    //create list of values to censor:
    var censorChildItems = [];
    for (var key in recursiveItems) {
        var value = source[key];
        //all complex child objects should not apear again in children:
        censorChildItems.push(value);
    }
    //censor all circular values
    for (var key in recursiveItems) {
        var value = source[key];
        var censored = false;
        censorTheseItems.forEach(function (item) {
            if (item === value) {
                censored = true;
            }
        });
        if (censored) {
            //change circular values to this
            value = censoredMessage;
        } else {
            //recursion:
            value = preventCircularJson(value, censoredMessage, censorChildItems.concat(censorTheseItems));
        }
        ret[key] = value

    }

    return ret;
}