@shoppredigital/oauth2-server

v2.4.5

Published

3 years ago

Complete, compliant and well tested module for implementing an OAuth2 Server/Provider with express in node.js

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Node OAuth2 Server

Demo | Implementation |

Complete, compliant and well tested module for implementing an OAuth2 Server/Provider with express in node.js

Installation

npm i @shoppredigital/oauth2-server

Quick Start

The module provides two middlewares, one for authorization and routing, another for error handling, use them as you would any other middleware:

var express = require('express'),
    bodyParser = require('body-parser'),
    oauthserver = require('@shoppredigital/oauth2-server');

var app = express();

app.use(bodyParser.urlencoded({ extended: true }));

app.use(bodyParser.json());

app.oauth = oauthserver({
  model: {}, // See below for specification
  grants: ['password'],
  debug: true
});

app.all('/oauth/token', app.oauth.grant());

app.get('/', app.oauth.authorise(), function (req, res) {
  res.send('Secret area');
});

app.use(app.oauth.errorHandler());

app.listen(3000);

After running with node, visting http://127.0.0.1:3000 should present you with a json response saying your access token could not be found.

Note: As no model was actually implemented here, delving any deeper, i.e. passing an access token, will just cause a server error. See below for the specification of what's required from the model.

Features

Supports authorization_code, password, refresh_token, client_credentials and extension (custom) grant types
Implicitly supports any form of storage e.g. PostgreSQL, MySQL, Mongo, Redis...
Full test suite

Options

string model
Model object (see below)
array grants
grant types you wish to support, currently the module supports authorization_code, password, refresh_token and client_credentials
Default: []
function|boolean debug
If true errors will be logged to console. You may also pass a custom function, in which case that function will be called with the error as its first argument
Default: false
number accessTokenLifetime
Life of access tokens in seconds
If null, tokens will considered to never expire
Default: 3600
number refreshTokenLifetime
Life of refresh tokens in seconds
If null, tokens will considered to never expire
Default: 1209600
number authCodeLifetime
Life of auth codes in seconds
Default: 30
regexp clientIdRegex
Regex to sanity check client id against before checking model. Note: the default just matches common client_id structures, change as needed
Default: /^[a-z0-9-_]{3,40}$/i
boolean passthroughErrors
If true, non grant errors will not be handled internally (so you can ensure a consistent format with the rest of your api)
boolean continueAfterResponse
If true, next will be called even if a response has been sent (you probably don't want this)

Model Specification

The module requires a model object through which some aspects or storage, retrieval and custom validation are abstracted. The last parameter of all methods is a callback of which the first parameter is always used to indicate an error.

Note: see https://github.com/thomseddon/node-oauth2-server/tree/master/examples/postgresql for a full model example using postgres.

Always Required

getAccessToken (bearerToken, callback)

string bearerToken
The bearer token (access token) that has been provided
function callback (error, accessToken)
mixed error
- Truthy to indicate an error
object accessToken
- The access token retrieved form storage or falsey to indicate invalid access token
- Must contain the following keys:
  - date expires
    - The date when it expires
    - null to indicate the token never expires
  - mixed user or string|number userId
    - If a user key exists, this is saved as req.user
    - Otherwise a userId key must exist, which is saved in req.user.id

getClient (clientId, clientSecret, callback)

string clientId
string|null clientSecret
If null, omit from search query (only search by clientId)
function callback (error, client)
mixed error
- Truthy to indicate an error
object client
- The client retrieved from storage or falsey to indicate an invalid client
- Saved in req.client
- Must contain the following keys:
  - string clientId
  - string redirectUri (authorization_code grant type only)

grantTypeAllowed (clientId, grantType, callback)

string clientId
string grantType
function callback (error, allowed)
mixed error
- Truthy to indicate an error
boolean allowed
- Indicates whether the grantType is allowed for this clientId

saveAccessToken (accessToken, client, expires, user, callback)

string accessToken
mixed client
- Whatever was passed to getClient callback
date expires
object user
function callback (error)
mixed error
- Truthy to indicate an error

Required for `authorization_code` grant type

getAuthCode (authCode, callback)

string authCode
function callback (error, authCode)
mixed error
- Truthy to indicate an error
object authCode
- The authorization code retrieved form storage or falsey to indicate invalid code
- Must contain the following keys:
  - string|number clientId
    - client id associated with this auth code
  - date expires
    - The date when it expires
  - string|number userId
    - The userId

saveAuthCode (authCode, client, expires, user, callback)

string authCode
mixed client
- Whatever was passed to getClient callback
date expires
mixed user
- Whatever was passed as user to the codeGrant function (see example)
function callback (error)
mixed error
- Truthy to indicate an error

Required for `password` grant type

getUser (username, password, callback)

string username
string password
function callback (error, user)
mixed error
- Truthy to indicate an error
object user
- The user retrieved from storage or falsey to indicate an invalid user
- Saved in req.user
- Must contain the following keys:
  - string|number id

Required for `refresh_token` grant type

saveRefreshToken (refreshToken, client, expires, user, callback)

string refreshToken
mixed client
- Whatever was passed to getClient callback
date expires
object user
function callback (error)
mixed error
- Truthy to indicate an error

getRefreshToken (refreshToken, callback)

string refreshToken
The bearer token (refresh token) that has been provided
function callback (error, refreshToken)
mixed error
- Truthy to indicate an error
object refreshToken
- The refresh token retrieved form storage or falsey to indicate invalid refresh token
- Must contain the following keys:
  - string|number clientId
    - client id associated with this token
  - date expires
    - The date when it expires
    - null to indicate the token never expires
  - string|number userId
    - The userId

Optional for Refresh Token grant type

revokeRefreshToken (refreshToken, callback)

The spec does not actually require that you revoke the old token - hence this is optional (Last paragraph: http://tools.ietf.org/html/rfc6749#section-6)

string refreshToken
function callback (error)
mixed error
- Truthy to indicate an error

Required for extension grant grant type

extendedGrant (grantType, req, callback)

string grantType
The (custom) grant type
object req
The raw request
function callback (error, supported, user)
mixed error
- Truthy to indicate an error
boolean supported
- Whether you support the grant type
object user
- The user retrieved from storage or falsey to indicate an invalid user
- Saved in req.user
- Must contain the following keys:
  - string|number id

Required for `client_credentials` grant type

getUserFromClient (clientId, clientSecret, callback)

string clientId
string clientSecret
function callback (error, user)
mixed error
- Truthy to indicate an error
object user
- The user retrieved from storage or falsey to indicate an invalid user
- Saved in req.user
- Must contain the following keys:
  - string|number id

Optional

generateToken (type, req, callback)

string type
accessToken or refreshToken
object req
The current express request
function callback (error, token)
mixed error
- Truthy to indicate an error
string|object|null token
- string indicates success
- null indicates to revert to the default token generator
- object indicates a reissue (i.e. will not be passed to saveAccessToken/saveRefreshToken)
  - Must contain the following keys (if object):
    - string accessToken OR refreshToken dependant on type

Extension Grants

You can support extension/custom grants by implementing the extendedGrant method as outlined above. Any grant type that is a valid URI will be passed to it for you to handle (as defined in the spec). You can access the grant type via the first argument and you should pass back supported as false if you do not support it to ensure a consistent (and compliant) response.

Example using the `password` grant type

First you must insert client id/secret and user into storage. This is out of the scope of this example.

To obtain a token you should POST to /oauth/token. You should include your client credentials in the Authorization header ("Basic " + client_id:client_secret base64'd), and then grant_type ("password"), username and password in the request body, for example:

POST /oauth/token HTTP/1.1
Host: server.example.com
Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW
Content-Type: application/x-www-form-urlencoded

grant_type=password&username=johndoe&password=A3ddj3w

This will then call the following on your model (in this order):

getClient (clientId, clientSecret, callback)
grantTypeAllowed (clientId, grantType, callback)
getUser (username, password, callback)
saveAccessToken (accessToken, clientId, expires, user, callback)
saveRefreshToken (refreshToken, clientId, expires, user, callback) (if using)

Provided there weren't any errors, this will return the following (excluding the refresh_token if you've not enabled the refresh_token grant type):

HTTP/1.1 200 OK
Content-Type: application/json;charset=UTF-8
Cache-Control: no-store
Pragma: no-cache

{
  "access_token":"2YotnFZFEjr1zCsicMWpAA",
  "token_type":"bearer",
  "expires_in":3600,
  "refresh_token":"tGzv3JOkF0XG5Qx2TlKWIA"
}

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