Passport-Mercadolibre

Passport strategy for authenticating with MercadoLibre using the OAuth 2.0 API.

Learn more about MercadoLibre OAuth schema here.

Installation

$ npm install passport-mercadolibre

WARNING

The OAuth2 Module (0.9.5), which is a dependency, automatically adds a 'type=web_server' parameter to the query portion of the URL. This extra parameters, is currently not supported by MercadoLibre authentication server, and thus should be commented for the module to work.

To do this, you need to comment the following line in the node_modules\passport-oauth\node_modules\oauth\lib\auth2.js file:

exports.OAuth2.prototype.getOAuthAccessToken= function(code, params, callback) {
  var params= params || {};
  params['client_id'] = this._clientId;
  params['client_secret'] = this._clientSecret;

  // ------- COMMENT THIS LINE--------------
  // params['type']= 'web_server';
  // ---------------------------------------

  var codeParam = (params.grant_type === 'refresh_token') ? 'refresh_token' : 'code';
  params[codeParam]= code;

  ...
}

Configuration

The Mercadolibre authentication strategy authenticates users using a Mercadolibre account and OAuth 2.0 tokens. The strategy requires a verify callback, which accepts these credentials and calls done providing a user, as well as options specifying a client ID, client secret, and callback URL.

You can obtain the client ID and secret by creating a MercadoLibre app here.

var MercadoLibreStrategy = require('passport-mercadolibre').Strategy;

passport.use(new MercadoLibreStrategy({
    clientID: 'YOUR_CLIENT_ID',
    clientSecret: 'YOUR_CLIENT_SECRET',
    callbackURL: 'http://www.example.com/auth/mercadolibre/callback',
  },
  function (accessToken, refreshToken, profile, done) {
    // + store/retrieve user from database, together with access token and refresh token
    return done(null, profile); 
  }
));

passport.serializeUser(function (user, done) {
  done(null, user);
});

passport.deserializeUser(function (user, done) {
  done(null, user);
});

Usage

Use passport.authorize(), specifying the 'mercadolibre' strategy, to authenticate requests.

For example, as route middleware in an Express application:

app.get('/auth/mercadolibre',
  passport.authorize('mercadolibre'));

app.get('/auth/mercadolibre/callback', 
  passport.authorize('mercadolibre', { failureRedirect: '/login' }),
  function(req, res) {
    // Successful authentication, redirect home.
    res.redirect('/');
  });

app.get('/', ensureAuthenticated, 
  function(req, res) {
    res.send("Logged in user: " + req.user.nickname);
  }
);

function ensureAuthenticated(req, res, next) {
  if (req.isAuthenticated()) { 
    return next(); 
  };
  res.redirect('/auth/mercadolibre');
};

The properties available in the user object are:

  • provider --> mercadolibre
  • nickname
  • first_name
  • last_name
  • email
  • accessToken

But you can get more information (a lot more!) accessing the raw user profile as provided by MercadoLibre:

  • _raw --> raw server response
  • _json --> JSON object with server response

Note: Please notice that the module internally sets up the HTTPS module for using SSL v3 as shown below:

https.globalAgent.options.secureProtocol = 'SSLv3_method';

License

The MIT License

Thanks

Thanks to https://github.com/mjpearson/passport-wordpress for the README and file structure.

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