Wondering what‚Äôs next for npm?Check out our public roadmap! ¬Ľ

    simple-oauth2
    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/simple-oauth2 package

    4.2.0¬†‚Äʬ†Public¬†‚Äʬ†Published

    Simple OAuth2

    NPM Package Version Build Status Dependency Status

    Simple OAuth2 is a Node.js client library for the OAuth 2.0 authorization framework. OAuth 2.0 is the industry-standard protocol for authorization, enabling third-party applications to obtain limited access to an HTTP service, either on behalf of a resource owner or by allowing the third-party application to obtain access on it's own behalf.

    Table of Contents

    Requirements

    Version Node support
    3.x Node 8.x or higher
    4.x (Current) Node 12.x or higher

    Older node versions are unsupported.

    Usage

    Install the client library using npm:

    npm install --save simple-oauth2

    With a minimal configuration, create an client instace of any supported grant type.

    const config = {
      client: {
        id: '<client-id>',
        secret: '<client-secret>'
      },
      auth: {
        tokenHost: 'https://api.oauth.com'
      }
    };
     
    const { ClientCredentials, ResourceOwnerPassword, AuthorizationCode } = require('simple-oauth2');

    For a complete reference of configuration options, see the API Options

    Supported Grant Types

    Depending on your use-case, any of the following supported grant types may be useful:

    Authorization Code Grant

    The Authorization Code grant type is used by confidential and public clients to exchange an authorization code for an access token. After the user returns to the client via the redirect URL, the application will get the authorization code from the URL and use it to request an access token.

    async function run() {
      const client = new AuthorizationCode(config);
     
      const authorizationUri = client.authorizeURL({
        redirect_uri: 'http://localhost:3000/callback',
        scope: '<scope>',
        state: '<state>'
      });
     
      // Redirect example using Express (see http://expressjs.com/api.html#res.redirect)
      res.redirect(authorizationUri);
     
      const tokenParams = {
        code: '<code>',
        redirect_uri: 'http://localhost:3000/callback',
        scope: '<scope>',
      };
     
      try {
        const accessToken = await client.getToken(tokenParams);
      } catch (error) {
        console.log('Access Token Error', error.message);
      }
    }
     
    run();

    See the API reference for a complete reference of available options or any of our available examples at the example folder.

    Resource Owner Password Credentials Grant

    The Resource Owner Password Credentials grant type is a way to exchange a user's credentials for an access token. Because the client application has to collect the user's password and send it to the authorization server, it is not recommended that this grant be used at all anymore.

    async function run() {
      const client = new ResourceOwnerPassword(config);
     
      const tokenParams = {
        username: 'username',
        password: 'password',
        scope: '<scope>',
      };
     
      try {
        const accessToken = await client.getToken(tokenParams);
      } catch (error) {
        console.log('Access Token Error', error.message);
      }
    }
     
    run();

    See the API reference for a complete reference of available options.

    Client Credentials Grant

    The Client Credentials grant type is used by clients to obtain an access token outside of the context of a user. This is typically used by clients to access resources about themselves rather than to access a user's resources.

    async function run() {
      const client = new ClientCredentials(config);
     
      const tokenParams = {
        scope: '<scope>',
      };
     
      try {
        const accessToken = await client.getToken(tokenParams);
      } catch (error) {
        console.log('Access Token error', error.message);
      }
    }
     
    run();

    See the API reference for a complete reference of available options.

    Access Token

    On completion of any supported grant type an access token will be obtained. A list of supported operations can be found below.

    Refresh an access token

    On long lived applications, it is often necessary to refresh access tokens. In such scenarios the access token is usually persisted in an external database by first serializing it.

    async function run() {
      const accessTokenJSONString = JSON.stringify(accessToken);
     
      await persistAccessTokenJSON(accessTokenJSONString);
    }
     
    run();

    By the time we need to refresh the persistent access token, we can get back an AccessToken instance by using the client's .createToken method.

    async function run() {
      const accessTokenJSONString = await getPersistedAccessTokenJSON();
     
      let accessToken = client.createToken(JSON.parse(accessTokenJSONString));
    }
     
    run();

    Once we have determined the access token needs refreshing with the .expired() method, we can finally refresh it with a .refresh() method call.

    async function run() {
      if (accessToken.expired()) {
        try {
          const refreshParams = {
            scope: '<scope>',
          };
     
          accessToken = await accessToken.refresh(refreshParams);
        } catch (error) {
          console.log('Error refreshing access token: ', error.message);
        }
      }
    }
     
    run();

    The .expired() helper is useful for knowing when a token has definitively expired. However, there is a common race condition when tokens are near expiring. If an OAuth 2.0 token is issued with a expires_in property (as opposed to an expires_at property), there can be discrepancies between the time the OAuth 2.0 server issues the access token and when it is received.

    These come down to factors such as network and processing latency and can be worked around by preemptively refreshing the access token:

    async function run() {
      const EXPIRATION_WINDOW_IN_SECONDS = 300; // Window of time before the actual expiration to refresh the token
     
      if (accessToken.expired(EXPIRATION_WINDOW_IN_SECONDS)) {
        try {
          accessToken = await accessToken.refresh();
        } catch (error) {
          console.log('Error refreshing access token: ', error.message);
        }
      }
    }
     
    run();

    Warning: Tokens obtained with the Client Credentials grant may not be refreshed. Fetch a new token when it's expired.

    See the API reference for a complete reference of available options.

    Revoke an access or refresh token

    When you've done with the token or you want to log out, you can revoke both access and refresh tokens.

    async function run() {
      try {
        await accessToken.revoke('access_token');
        await accessToken.revoke('refresh_token');
      } catch (error) {
        console.log('Error revoking token: ', error.message);
      }
    }
     
    run();

    As a convenience method, you can also revoke both tokens in a single call:

    async function run() {
      try {
        // Revokes both tokens, refresh token is only revoked if the access_token is properly revoked
        await accessToken.revokeAll();
      } catch (error) {
        console.log('Error revoking token: ', error.message);
      }
    }
     
    run();

    See the API reference for a complete reference of available options.

    Errors

    Whenever a client or server error is produced, a boom error is thrown by the library. As such any boom error property is available, but the exact information may vary according to the type of error.

    async function run() {
      const client = new ClientCredentials(config);
     
      try {
        await client.getToken();
      } catch(error) {
        console.log(error.output);
      }
    }
     
    run();
     
    // { statusCode: 401,
    //   payload:
    //    { statusCode: 401,
    //      error: 'Unauthorized',
    //      message: 'Response Error: 401 Unauthorized' },
    //   headers: {} }

    Debugging the module

    This module uses the debug module to help on error diagnosis. Use the following environment variable to help in your debug journey:

    DEBUG=*simple-oauth2*
    

    Contributing

    See CONTRIBUTING

    Authors

    Andrea Reginato

    Contributors

    Special thanks to the following people for submitting patches.

    Changelog

    See CHANGELOG

    License

    Simple OAuth 2.0 is licensed under the Apache License, Version 2.0

    Thanks to Open Source

    Simple OAuth 2.0 come to life thanks to the work I've made in Lelylan, an open source microservices architecture for the Internet of Things. If this project helped you in any way, think about giving us a star on Github.

    Install

    npm i simple-oauth2

    DownloadsWeekly Downloads

    55,323

    Version

    4.2.0

    License

    Apache-2.0

    Unpacked Size

    44.7 kB

    Total Files

    15

    Last publish

    Collaborators

    • avatar
    • avatar