OAuth2orize

OAuth2orize is an authorization server toolkit for Node.js. It provides a suiteof middleware that, combined with Passportauthentication strategies and application-specific route handlers, can be usedto assemble a server that implements the OAuth 2.0protocol.

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Install

$ npm install oauth2orize

Usage

OAuth 2.0 defines an authorization framework, allowing an extensible set ofauthorization grants to be exchanged for access tokens. Implementations arefree to choose what grant types to support, by using bundled middleware tosupport common types or plugins to support extension types.

Create an OAuth Server

Call createServer() to create a new OAuth 2.0 server. This instance exposesmiddleware that will be mounted in routes, as well as configuration options.

var server = oauth2orize.createServer();

Register Grants

A client must obtain permission from a user before it is issued an access token.This permission is known as a grant, the most common type of which is anauthorization code.

server.grant(oauth2orize.grant.code(function(client, redirectURI, user, ares, done) {
  var code = utils.uid(16);

  var ac = new AuthorizationCode(code, client.id, redirectURI, user.id, ares.scope);
  ac.save(function(err) {
    if (err) { return done(err); }
    return done(null, code);
  });
}));

OAuth2orize also bundles support for implicit token grants.

Register Exchanges

After a client has obtained an authorization grant from the user, that grant canbe exchanged for an access token.

server.exchange(oauth2orize.exchange.code(function(client, code, redirectURI, done) {
  AuthorizationCode.findOne(code, function(err, code) {
    if (err) { return done(err); }
    if (client.id !== code.clientId) { return done(null, false); }
    if (redirectURI !== code.redirectUri) { return done(null, false); }

    var token = utils.uid(256);
    var at = new AccessToken(token, code.userId, code.clientId, code.scope);
    at.save(function(err) {
      if (err) { return done(err); }
      return done(null, token);
    });
  });
}));

OAuth2orize also bundles support for password and client credential grants.Additionally, bundled refresh token support allows expired access tokens to berenewed.

Implement Authorization Endpoint

When a client requests authorization, it will redirect the user to anauthorization endpoint. The server must authenticate the user and obtaintheir permission.

app.get('/dialog/authorize',
  login.ensureLoggedIn(),
  server.authorize(function(clientID, redirectURI, done) {
    Clients.findOne(clientID, function(err, client) {
      if (err) { return done(err); }
      if (!client) { return done(null, false); }
      if (client.redirectUri != redirectURI) { return done(null, false); }
      return done(null, client, client.redirectURI);
    });
  }),
  function(req, res) {
    res.render('dialog', { transactionID: req.oauth2.transactionID,
                           user: req.user, client: req.oauth2.client });
  });

In this example, connect-ensure-loginmiddleware is being used to make sure a user is authenticated beforeauthorization proceeds. At that point, the application renders a dialogasking the user to grant access. The resulting form submission is processedusing decision middleware.

app.post('/dialog/authorize/decision',
   login.ensureLoggedIn(),
   server.decision());

Based on the grant type requested by the client, the appropriate grantmodule registered above will be invoked to issue an authorization code.

Session Serialization

Obtaining the user's authorization involves multiple request/response pairs.During this time, an OAuth 2.0 transaction will be serialized to the session.Client serialization functions are registered to customize this process, whichwill typically be as simple as serializing the client ID, and finding the clientby ID when deserializing.

server.serializeClient(function(client, done) {
  return done(null, client.id);
});

server.deserializeClient(function(id, done) {
  Clients.findOne(id, function(err, client) {
    if (err) { return done(err); }
    return done(null, client);
  });
});

Implement Token Endpoint

Once a user has approved access, the authorization grant can be exchanged by theclient for an access token.

app.post('/token',
  passport.authenticate(['basic', 'oauth2-client-password'], { session: false }),
  server.token(),
  server.errorHandler());

Passport strategies are used to authenticate theclient, in this case using either an HTTP Basic authentication header (asprovided by passport-http) orclient credentials in the request body (as provided bypassport-oauth2-client-password).

Based on the grant type issued to the client, the appropriate exchange moduleregistered above will be invoked to issue an access token. If an error occurs,errorHandler middleware will format an error response.

Implement API Endpoints

Once an access token has been issued, a client will use it to make API requestson behalf of the user.

app.get('/api/userinfo', 
  passport.authenticate('bearer', { session: false }),
  function(req, res) {
    res.json(req.user);
  });

In this example, bearer tokens are issued, which are then authenticated usingan HTTP Bearer authentication header (as provided by passport-http-bearer)

Examples

This example demonstrateshow to implement an OAuth service provider, complete with protected API access.

Related Modules

• oauth2orize-openid — Extensions to support OpenID Connect
• oauth2orize-jwt-bearer — Exchange JWT assertions for access tokens
• passport-http-bearer — Bearer token authentication strategy for APIs

Debugging

oauth2orize uses the debug module. You can enable debugging messages on the console by doing export DEBUG=oauth2orize before running your application.

License

The MIT License

Copyright (c) 2012-2018 Jared Hanson <http://jaredhanson.net/>