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Warden::OAuth2

This library provides a robust set of authorization strategies for Warden meant to be used to implement an OAuth 2.0 (draft 22) provider.

Usage

Grape API Example

require 'grape'
require 'warden-oauth2'

class MyAPI < Grape::API
  use Warden::Manager do |config|
    strategies.add :bearer, Warden::OAuth2::Strategies::Bearer
    strategies.add :client, Warden::OAuth2::Strategies::Client
    strategies.add :public, Warden::OAuth2::Strategies::Public

    config.default_strategies :bearer, :client, :public
    config.failure_app Warden::OAuth2::FailureApp
  end

  helpers do
    def warden; env['warden'] end
  end

  resources :hamburgers do
    before do
      warden.authenticate! scope: :hamburgers
    end
  end
end

Configuration

You can configure Warden::OAuth2 like so:

Warden::OAuth2.configure do |config|
  config.some_option = some_value
end

Configurable Options

• client_model: A client application class. See Models below. Defaults to ClientApplication.
• token_model: An access token class. See Models below. Defaults to AccessToken.

Models

You will need to supply data models to back up the persistent facets of your OAuth 2.0 implementation. Below are examples of the interfaces that each require.

Client Application

class ClientApplication
  # REQUIRED
  def self.locate(client_id, client_secret = nil)
    # Should return a client application matching the client_id
    # provided, but should ONLY match client_secret if it is
    # provided.
  end

  # OPTIONAL
  def scope?(scope)
    # True if the client should be able to access the scope passed
    # (usually a symbol) without having an access token.
  end
end

Access Token

class AccessToken
  # REQUIRED
  def self.locate(token_string)
    # Should return an access token matching the string provided.
    # Note that you MAY include expired access tokens in the result
    # of this method so long as you implement an instance #expired?
    # method.
  end

  # OPTIONAL
  def expired?
    # True if the access token has reached its expiration.
  end

  # OPTIONAL
  def scope?(scope)
    # True if the scope passed in (usually a symbol) has been authorized
    # for this access token.
  end
end

Strategies

Bearer

This strategy authenticates by trying to find an access token that is supplied according to the OAuth 2.0 Bearer Token specification (draft 8). It does this by first extracting the access token in string form and then calling the .locate method on your access token model (see Configuration above).

Token-based strategies will also fail if they are expired or lack sufficient scope. See Models above.

User: The Warden user is set to the client application returned by .locate.

Client

This strategy authenticates an OAuth 2.0 client application directly for endpoints that don't require a specific user. You might use this strategy when you want to create an API for client statistics or if you wish to rate limit based on a client application even for publicly accessible endpoints.

User: The Warden user is set to the access token returned by .locate.

Public

This strategy succeeds by default and only fails if the authentication scope is set and is something other than :public.

User: The Warden user is set to nil.

License

Copyright (C) 2011 by Michael Bleigh and Opperator, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.