server.js

const express = require("express");
const app = express();
const cfenv = require("cfenv");
const bodyParser = require('body-parser')
const session = require("express-session");
const passport = require("passport");
const WebAppStrategy = require("bluemix-appid").WebAppStrategy;
const CALLBACK_URL = "/ibm/bluemix/appid/callback";

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())

var mydb;

/* Endpoint to greet and add a new visitor to database.
* Send a POST request to localhost:3000/api/visitors with body
* {
* 	"name": "Bob"
* }
*/
app.post("/api/visitors", function (request, response) {
  var userName = request.body.name;
  if(!mydb) {
    console.log("No database.");
    response.send("Hello " + userName + "!");
    return;
  }
  // insert the username as a document
  mydb.insert({ "name" : userName }, function(err, body, header) {
    if (err) {
      return console.log('[mydb.insert] ', err.message);
    }
    response.send("Hello " + userName + "! I added you to the database.");
  });
});

/**
 * Endpoint to get a JSON array of all the visitors in the database
 * REST API example:
 * <code>
 * GET http://localhost:3000/api/visitors
 * </code>
 *
 * Response:
 * [ "Bob", "Jane" ]
 * @return An array of all the visitor names
 */
app.get("/api/visitors", function (request, response) {
  var names = [];
  if(!mydb) {
    response.json(names);
    return;
  }

  mydb.list({ include_docs: true }, function(err, body) {
    if (!err) {
      body.rows.forEach(function(row) {
        if(row.doc.name)
          names.push(row.doc.name);
      });
      response.json(names);
    }
  });
});


// load local VCAP configuration  and service credentials
var vcapLocal;
try {
  vcapLocal = require('./vcap-local.json');
  console.log("Loaded local VCAP", vcapLocal);
} catch (e) { }

const appEnvOpts = vcapLocal ? { vcap: vcapLocal} : {}

const appEnv = cfenv.getAppEnv(appEnvOpts);

if (appEnv.services['cloudantNoSQLDB'] || appEnv.getService(/cloudant/)) {
  // Load the Cloudant library.
  var Cloudant = require('cloudant');

  // Initialize database with credentials
  if (appEnv.services['cloudantNoSQLDB']) {
     // CF service named 'cloudantNoSQLDB'
     var cloudant = Cloudant(appEnv.services['cloudantNoSQLDB'][0].credentials);
  } else {
     // user-provided service with 'cloudant' in its name
     var cloudant = Cloudant(appEnv.getService(/cloudant/).credentials);
  }

  //database name
  var dbName = 'mydb';

  // Create a new "mydb" database.
  cloudant.db.create(dbName, function(err, data) {
    if(!err) //err if database doesn't already exists
      console.log("Created database: " + dbName);
  });

  // Specify the database we are going to use (mydb)...
  mydb = cloudant.db.use(dbName);
}

//serve static file (index.html, images, css)
app.use(express.static(__dirname + '/views'));

app.use(session({
   secret: "123456",
   resave: true,
   saveUninitialized: true
 }));
app.use(passport.initialize());
 app.use(passport.session());

 passport.use(new WebAppStrategy());
passport.serializeUser(function(user, cb) {
   cb(null, user);
 });

 passport.deserializeUser(function(obj, cb) {
   cb(null, obj);
 });

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())

// Callback to complete login process
app.get(CALLBACK_URL, passport.authenticate(WebAppStrategy.STRATEGY_NAME));

// Simple protected route that greets user by name and adds to database if bound to app
app.get("/protected", passport.authenticate(WebAppStrategy.STRATEGY_NAME), function(req, res) {
         if (!mydb) {
           res.send("Hello " + req.user.name + "!")
         } else {
           mydb.insert({ "name" : req.user.name }, function(err, body, header) {
             if (err) {
               return console.log('[mydb.insert] ', err.message);
             }
             res.send("Hello " + req.user.name + "! I added you to the database.");
           });
         }
 });


var port = process.env.PORT || 3000
app.listen(port, function() {
    console.log("To view your app, open this link in your browser: http://localhost:" + port);
});