How do I add a json web token to each header?

Question

So I am trying to use JSON web tokens for authentication and am struggling trying to figure out how to attach them to a header and send them on a request.

I was trying t

Answer 1

I see several options to set an header transparently for each request:

• Implement an HttpClient service to use instead of the default Http one.
• Provide your own implementation of the RequestOptions class
• Override the Http class it self

This way you could set your header in one place and this would impact aok your HTTP calls.

See the following questions:

• How to set default HTTP header in Angular2?
• Angular2 - set headers for every request
• How do you set global custom headers in Angular2?

Answer 2

Here is an example from Angular code to get plans for instance, you just write it like this,

 $scope.getPlans = function(){
    $http({
      url: '/api/plans',
      method: 'get',
      headers:{
        'x-access-token': $rootScope.token
      }
    }).then(function(response){
      $scope.plans = response.data;
    });
  }

and on your server, you can do this,

var jwt    = require('jsonwebtoken'); // used to create, sign, and verify tokens
var config = require('./config'); // get our config file

var secret = {superSecret: config.secret}; // secret variable

// route middleware to verify a token. This code will be put in routes before the route code is executed.
PlansController.use(function(req, res, next) {

  // check header or url parameters or post parameters for token
  var token = req.body.token || req.query.token || req.headers['x-access-token'];

  // If token is there, then decode token
  if (token) {

    // verifies secret and checks exp
    jwt.verify(token, secret.superSecret, function(err, decoded) {
      if (err) {
        return res.json({ success: false, message: 'Failed to authenticate token.' });
      } else {
        // if everything is good, save to incoming request for use in other routes
        req.decoded = decoded;
        next();
      }
    });

  } else {

    // if there is no token
    // return an error
    return res.status(403).send({
        success: false,
        message: 'No token provided.'
    });

  }
});

// Routes
PlansController.get('/', function(req, res){
  Plan.find({}, function(err, plans){
  res.json(plans);
  });
});

If you are still not clear, you can check out the details on my blog post here, Node API Authentication with JSON Web Tokens - the right way.

Answer 3

Create custom http class and override the request method to add the token in every http request.

http.service.ts

import {Injectable} from '@angular/core';
import {Http, XHRBackend, RequestOptions, Request, RequestOptionsArgs, Response, Headers} from '@angular/http';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';

@Injectable()
export class HttpService extends Http {

  constructor (backend: XHRBackend, options: RequestOptions) {
    let token = localStorage.getItem('auth_token'); // your custom token getter function here
    options.headers.set('Authorization', `Bearer ${token}`);
    super(backend, options);
  }

  request(url: string|Request, options?: RequestOptionsArgs): Observable<Response> {
    let token = localStorage.getItem('auth_token');
    if (typeof url === 'string') { // meaning we have to add the token to the options, not in url
      if (!options) {
        // let's make option object
        options = {headers: new Headers()};
      }
      options.headers.set('Authorization', `Bearer ${token}`);
    } else {
    // we have to add the token to the url object
      url.headers.set('Authorization', `Bearer ${token}`);
    }
    return super.request(url, options).catch(this.catchAuthError(this));
  }

  private catchAuthError (self: HttpService) {
    // we have to pass HttpService's own instance here as `self`
    return (res: Response) => {
      console.log(res);
      if (res.status === 401 || res.status === 403) {
        // if not authenticated
        console.log(res);
      }
      return Observable.throw(res);
    };
  }
}

Now, we need to configure our main module to provide the XHRBackend to our custom http class. In your main module declaration, add the following to the providers array:

app.module.ts

import { HttpModule, RequestOptions, XHRBackend } from '@angular/http';
import { HttpService } from './services/http.service';
...
@NgModule({
  imports: [..],
  providers: [
    {
      provide: HttpService,
      useFactory: (backend: XHRBackend, options: RequestOptions) => {
        return new HttpService(backend, options);
      },
      deps: [XHRBackend, RequestOptions]
    }
  ],
  bootstrap: [ AppComponent ]
})

After that, you can now use your custom http provider in your services. For example:

user.service.ts

import { Injectable }     from '@angular/core';
import {HttpService} from './http.service';

@Injectable()
class UserService {
  constructor (private http: HttpService) {}

  // token will added automatically to get request header
  getUser (id: number) {
    return this.http.get(`/users/${id}`).map((res) => {
      return res.json();
    } );
  }
}

Source