Rodney Vg

Rodney Vg

1575382381

Implementing Sign in with Twitter for Node.js

Twitter uses the standard OAuth for authentication, which means you incorporate a standardized way of logging in if you use Twitter sign in.

In Node.js, it is very easy to add Twitter sign in to an Express web app.

Getting Started

First, you have to make an Express app. Express is a routing library with a lot of add-ons built for easy web development.

There are many Express app boilerplates available on the web. There is also an Express code generator from the makers of the Express framework.

Using the latest Node.js versions, you can run npx express-generator.

If npx is not available, you can install express-generator globally and run that:

$ npm install -g express-generator
$ express

Make a folder for your project and follow the instructions.

To make the example simple, this app will provide the redirect URL that you get after providing the consumer key and request token for the Angular app.

Then, after the user goes through the Twitter sign in, it will redirect back to the Angular app, which will then call the Express API to save the OAuth access token and the OAuth access token secret to a database.

We need to make an entry point file for Express.

We need to install express-session, express-logger, cookie-parser, and cors for saving sessions, logging, parsing cookies, and allowing external requests for our Angular app, respectively.

babel-register and bale-polyfill are required to use the latest JavaScript features in our Node.js web app.

To save the secrets, use the [dotenv](https://www.npmjs.com/package/dotenv) library. With this, the secrets will be read from the .env file, rather than hard coding them into the code, which is very bad secret practice.

To get the Twitter keys, you have to apply for a developer account at https://developer.twitter.com/. You will then get the keys and secrets required, which you will put into the .env file.

The .env file should be a key-value list, like this:

TWITTER_CONSUMER_KEY=''
TWITTER_CONSUMER_SECRET=''
TWITTER_CALLBACK_URL='[http://localhost:4200](http://localhost:4200/settings' "http://localhost:4200")'
SESSION_SECRET=''

I will call the entry point file app.js .

To run this, go to your project folder and run node app.js:

require("@babel/register");
require("babel-polyfill");
require('dotenv').config();
const express = require('express');
const bodyParser = require('body-parser');
const logger = require('express-logger');
const cookieParser = require('cookie-parser');
const session = require('express-session');
const cors = require('cors');
const sessions = require('./controllers/sessionsController');
const app = express();
app.use(cors())
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(logger({ path: "log/express.log" }));
app.use(cookieParser());
app.use(session({ secret: process.env.SESSION_SECRET, resave: false, saveUninitialized: true }));
app.use((req, res, next) => {
  res.locals.session = req.session;
  next();
});
app.use('/sessions', sessions);
app.listen(8080, () => {
  console.log('App running on port 8080!');
});

app.js

Then, we need the oauth library to make an oauth.OAuth object which will allow the Express app to get the request token and request token secret.

Add a controllers folder in the same level as app.js.

Then, add sessionsController.js into the controllers folder.

Add the following to sessionsController.js:

const express = require('express');
const router = express.Router();
const CryptoJS = require("crypto-js");
const oauth = require('oauth');
const _twitterConsumerKey = process.env.TWITTER_CONSUMER_KEY;
const _twitterConsumerSecret = process.env.TWITTER_CONSUMER_SECRET;
const twitterCallbackUrl = process.env.TWITTER_CALLBACK_URL;
const consumer = new oauth.OAuth("https://twitter.com/oauth/request_token", "https://twitter.com/oauth/access_token",_twitterConsumerKey, _twitterConsumerSecret, "1.0A", twitterCallbackUrl, "HMAC-SHA1");
router.get('/connect', (req, res) => {
  consumer.getOAuthRequestToken(function (error, oauthToken,   oauthTokenSecret, results) {
    if (error) {
      res.send(error, 500);
    } else {
      req.session.oauthRequestToken = oauthToken;
      req.session.oauthRequestTokenSecret = oauthTokenSecret;
      const redirect = { 
redirectUrl: `https://twitter.com/oauth/authorize?  oauth_token=${req.session.oauthRequestToken}`
    }
      res.send(redirect);
    }
  });
});
router.get('/saveAccessTokens', authCheck, (req, res) => {
  consumer.getOAuthAccessToken(
  req.query.oauth_token,
  req.session.oauthRequestTokenSecret,
  req.query.oauth_verifier,
  (error, oauthAccessToken, oauthAccessTokenSecret, results) => {
    if (error) {
      logger.error(error);
      res.send(error, 500);
    }
    else {
      req.session.oauthAccessToken = oauthAccessToken;
      req.session.oauthAccessTokenSecret = oauthAccessTokenSecret
      return res.send({ message: 'token saved' });
    }
  });
});
module.exports = router;

sessionsController.js

The connect route will send the Twitter sign-in URL as the redirect URL.

Then, the Angular app will call the saveAccessTokens route to store the OAuth access token and its secret in the session.

Angular CLI

To build the Angular app, you need the Angular CLI.

To install it, run npm i -g @angular/cli in your Node.js command prompt. Then, run ng new frontend to generate the skeleton code for your front end app.

Also, install @angular/material according to the Angular documentation.

After that, replace the default app.module.ts with the following:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import {
  MatButtonModule,
  MatTableModule,
  MAT_DIALOG_DEFAULT_OPTIONS,
} from '@angular/material';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { SettingsPageComponent } from './settings-page/settings-page.component';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { SessionService } from './session.service';
import { HttpReqInterceptor } from './http-req-interceptor';
@NgModule({
  declarations: [
    AppComponent,
    SettingsPageComponent,
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    BrowserAnimationsModule,
    MatButtonModule,
    FormsModule,
    HttpClientModule,
  ],
  providers: [
    SessionService,
    {
      provide: HTTP_INTERCEPTORS,
      useClass: HttpReqInterceptor,
      multi: true
    },
    UserService,
    TweetsService,
  ],
  bootstrap: [AppComponent],
})
export class AppModule { }

app.module.ts

We need to use Angular’s HTTP client to connect to our Express routes to get the redirect URL and get the access token from the redirect after logging in with Twitter, then send it back to our route.

To do this, run ng g service session.

This will create session.service.ts:

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { environment } from 'src/environments/environment';
@Injectable({
  providedIn: 'root'
})
export class SessionService {
  constructor(private http: HttpClient) { }
  getRedirectUrl() {
  return this.http.get(`${environment.apiUrl}/sessions/connect`)
}
  saveAccessToken(oauthToken: string, oauthVerifier: string) {
    return this.http.get(`${environment.apiUrl}/sessions/saveAccessTokens?oauth_token=${oauthToken}&oauth_verifier=${oauthVerifier}`)
  }
}

session.service.ts

In here, environment.apiUrl is the URL to our API, which is specified in environment.ts.

Now, we need a page with a button that calls our Express route to get the redirect URL.

Run ng g component settingsPage to create settings-page.component.ts and settings-page.component.html, which is where the button will be placed.

Add the following to settings-page.component.html:

<div>
  <button mat-raised-button (click)='redirectToTwitter()'>Connect to Twitter Account</button>
</div>

Then, add the following settings-page.component.ts:

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { SessionService } from '../session.service';
@Component({
  selector: 'app-settings-page',
  templateUrl: './settings-page.component.html',
  styleUrls: ['./settings-page.component.scss']
})
export class SettingsPageComponent implements OnInit {
  constructor(
    private activatedRoute: ActivatedRoute,
    private sessionService: SessionService,
  ) {
    this.activatedRoute.queryParams.subscribe(params => {
      const oauthVerifier = params['oauth_verifier'];
      const oauthToken = params['oauth_token'];
      if (oauthToken && oauthVerifier) {
        this.saveAccessToken(oauthToken, oauthVerifier);
      }
    });
  }
  ngOnInit() {}
  saveAccessToken(oauthToken: string, oauthVerifier: string) {
    this.sessionService.saveAccessToken(oauthToken, oauthVerifier).subscribe(res => {
    alert('Token saved');
    })
  }
  redirectToTwitter() {
    this.sessionService.getRedirectUrl().subscribe((res: any) => {
      location.href = res.redirectUrl;
    })
  }
}

settings-page.component.ts

After adding the code above, you get a button that, after you click it, will go to the Twitter sign in page.

Then, once Twitter sign in succeeds, you will be redirected to the same page with the OAuth access token and verifier, which will be sent to our Express API and stored in the session.

Token Saved

You will get Token saved message once it succeeds.

In the end, this is the workflow you should get:

  1. First, you get the connect button:

This is image title

  1. Then, you are redirected to the Twitter login:

This is image title

  1. Finally, you are redirected back with the OAuth access token and verifier, and with those, you get the access token and secret which will be stored to the session.

If that succeeds, the saveAccessTokens route will return a successful response, which will then trigger the Angular app to alert Token saved.

#nodejs #javascript

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Buddha Community

Implementing Sign in with Twitter for Node.js

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Aria Barnes

Aria Barnes

1622719015

Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

  • quick execution and information preparing; 
  • exceptionally reusable code; 
  • the code is not difficult to learn, compose, read, and keep up; 
  • tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.

 

Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

Original Source

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Node.js is a prominent tech trend in the space of web and mobile application development. It has been proven very efficient and useful for a variety of application development. Thus, all business owners are eager to leverage this technology for creating their applications.

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