Bungie Auth

The bungie-auth module exposes a nice API to authenticate withe Bungie.net's oAuth 2.0 based authentication process.

Table of Contents

• Installation
• Usage
• API
  • token
  • request
  • refresh
  • payload
  • alive
  • expired
  • capture
  • open
  • url
  • secure
  • send
  • setTimeout
• pre-build
  • electron
• license

Installation

The module is released to the public npm registry and can be installed by running:

npm install --save bungie-auth

Please note that this module is written in ES6, if you wish to use it in a Node.js environment you might need to use babel to transform the module to an ES5 compatible version.

Usage

The following configuration values are required:

• redirectURL The URL that Bungie redirects to.
• url The unique Authorization URL that Bungie created for your application.
• key The API for your Authorization URL.

While not strictly required you want to supply this by default as well if you have it:

• refreshToken The responseToken object you got back from the API.
• accessToken The accessToken object you got back from the API.

These values should be stored locally and securely so you don't have to authenticate every single time people open your application. The following configuration values are optional:

• buffer Number in seconds. Amount of seconds that will be extracted from the expires value of the accessToken and refreshToken. Defaults to 60.
• fresh Function. Callback to indicate that we automatically want to refresh the cached internal accessToken when it's about to expire. The fresh method will be called with the new payload.

API

import Bungo from 'bungie-auth/electron';
 
const bungie = new Bungo({
  key: '..',
  url: '..'
});

The created bungie instance will have the following methods available.

• token
• request
• refresh
• payload
• alive
• expired
• capture
• open
• url
• secure
• send
• setTimeout

Once you've received the accessToken from one of our API methods you can use it's value to create the Authorization header that might be needed for the the API calls:

bungie.token(function (err, paylaod) {
  if (err) throw err;
 
  const token = payload.accessToken.value;
  const authorization = `Bearer ${token}`;
});

token

Retrieve the access token from the API. If we have a cached accessToken which is still good, we will use that. If it's expired we will generate a new one with a refreshToken that we might have. If that case fails, we will ask the user login again so we get a fresh refreshToken and accessToken.

The method accepts a single argument:

• fn An error first callback that receives potential errors as first argument and the payload as second argument.

bungie.token(function (err, payload) {
 
});

request

Request a new access token. This will ask the user to login with their credentials and does the initial call the Bungie servers to retrieve the accessToken and refreshToken.

The method accepts a single argument:

• fn An error first callback that receives potential errors as first argument and the payload as second argument.

bungie.request(function (err, payload) {
 
});

refresh

Refresh the accessToken as it expires after like 30 minutes once you first requested it (see expires value in seconds on the accessToken object).

The method accepts two arguments:

• token An optional token object that you received from payload. When omitted and used as single argument function it will default to the internally stored refreshToken.
• fn An error first callback that receives potential errors as first argument and the payload as second argument.

bungie.refresh(token, function (err, payload) {
 
});
 
bungie.refresh(function (err, payload) {
 
});

payload

Formats and returns the payload that we received from the Bungie servers. API methods like refresh, token, request use the returned object as response.

const data = bungie.payload();

The method returns the following object structure:

{
  accessToken: {
    value: 'your access token',
    readyin: 0,
    expires: 3600,
    epoch: 90874174017
  },
  refreshToken: {
    value: 'your refresh token',
    readyin: 1800,
    expires: 3600
    epoch: 90874174017
  }
}

The value is the actual token from the server. The readyin and expires are seconds. We add our own epoch property to each object. This is the result of Date.now() when we first received the information from the Bungie servers. This allows you to determine if the token is still valid or if it's expired.

alive

Check how long a given token has been alive. Returns time in seconds so it can be matched against the token.expires property.

The method accepts a single argument:

• token The accessToken or refreshToken object that was returned from the payload method.

bungie.alive(bungie.accessToken) // 189

expired

Check if a token is expired. It does this by checking the amount of seconds that have been passed since the token was received based on the epoch value that we added to the object. It automatically adds config.buffer in seconds to the time passed so we will have some spare time to request a new access token and prevent that API calls will use the token RIGHT when it expired. This gives you some peace of mind that the token you receive is alway valid for the amount of time was configured with the buffer option.

The method accepts a single argument:

• token The accessToken or refreshToken object that was returned from the payload method.

The method will return a boolean indicating if the token is still valid or needs to be re-requested.

bungie.expired(bungie.accessToken) // false

capture

private api

Intercept and capture all API responses from Bungie so we can store the values internally.

The method accepts a single argument:

• fn An error first callback that receives potential errors as first argument and the payload as second argument.

And it will return a wrapped function that should be for callbacks.

const fn = bungie.capture(callback);
bungie.send('GetAccessTokenFromRefreshToken', { refreshToken: token } fn);

open

private api

This is a method that should be implemented by our pre-build integrations. This method should start the oAuth 2.0 Authorization flow using the bungie.url() method. It should call the supplied callback once it receives the code and state back as query string values from the oAuth 2.0 redirect URL.

The method accepts a single argument:

• fn An error first callback that receives potential errors as first argument and the full redirect URL as second value.

Example implementation, take this with a grain of salt and look at our electron flow for a working example.

bungie.open = function open(fn) {
  var url = bungie.url();
 
  // implement opening of url, and capturing redirect url
  fn(undefined, redirect.url);
};

url

private api

Generate the URL that needs to be used for the oAuth 2.0 authorization flow. This automatically generates and stores a unique value as this.state which will be used in the secure method to validate the response.

The method will return a string which is the URL that should be opened to start the authentication process.

const url = bungie.url();

secure

private api

Checks the received URL to see if the received state query string matches our internal stored state so we can check if the request/response was tampered with.

The method accepts a single argument:

• url Full, unparsed URL string that Bungie used to redirect to. Should include the code and state query string values.

The method will return a boolean indicating if the URL is secure.

bungie.state = 'foo';
bungie.secure('http//example.com/oauth/redirect?state=foo&code=bar'); // true

send

private api

Our internal HTTP request method that does the API calls to the Bungie servers to validate/request the tokens and codes we receive from the Authorization flow. It automatically uses the supplied config.key for the X-API-Key header and handles all responses as JSON responses.

It requires the following arguments:

• pathname The pathname of /Platform/App/{pathanme here}/ we need to access.
• body An object that will be used as POST body.
• fn Completion callback that uses the error first callback pattern.

bungie.send('GetAccessTokenFromRefreshToken', { 
  refreshToken: token 
}, function (err, data) {
 
});

setTimeout

private api

Start the internal setTimeout so we can automatically refresh the cached accessToken using the refreshToken so our internally cached token is alway fresh and elimination possibility to provide an token that might expire in a second or to accidentally send multiple refresh requests to the bungie API.

bungie.setTimeout();

Pre-build

• Electron

In addition to the pre-build authorization flows for the various of frameworks that we support it is quite easy to roll your own. The only thing you need todo is extend our class and implement the open method as shown below:

import Bungo from 'bungie-auth';
 
export default class MyImplementation extends Bungo {
  open(fn) {
    const url = this.url();
 
    /* 
    do the stuffs that opens the authorization url and receives the redirect
    information and call the `fn` callback function with an optional error as
    first argument and the redirected URL as second argument and you're done.
    */
  }
}

After that you just construct an instance of your custom MyImplementation class and it should work with our described API's! If you want to contribute back to the community, we would love to support more pre-build authorization flows to make it easier for other people to create applications. So create a pull request with your new implementation and we'll make that happen!

Electron

This is a pre-build authorization flow for Electron so you can easily build desktop applications that interact with the Bungie.net API. The API should run in the electron instance and not the browser instance as it needs to be able to spawn windows and do POST calls to the Bungie API for access tokens.

The following properties are specific to electron

• electron Allows you to control options for the created BrowserWindow by default we will spawn a window that the same size as oAuth window.

While we allow you to configure the browser option, we forcefully apply nodeIntergration: false so the authentication actually works.

import Bungo from 'bungie-auth/electron';
 
const bungo = new Bungo({ /*.. config ..*/ });
 
bungo.token(function token(err, data) {
  console.log(data.accessToken.value); // CJ098da098df...
});

License

This module is released under the MIT license.