This is a plugin for implementing OAuth Providers and Consumers in Rails applications.
We support the revised OAuth 1.0a specs at:
and the OAuth site at:
For more about the changes made to OAuth1.0a please see Seth’s Idiot’s Guide to OAuth 1.0a.
mojodna.net/2009/05/20/an-idiots-guide-to-oauth-10a.html
You need to install the oauth gem (0.3.5) which is the core OAuth ruby library. It will NOT work on any previous version of the gem.
sudo gem install oauth
The plugin can now be installed as an gem from github, which is the easiest way to keep it up to date.
sudo gem install oauth-plugin
You should add the following in the gem dependency section of environment.rb
config.gem "oauth" config.gem "oauth-plugin"
Alternatively you can install it in vendors/plugin:
script/plugin install git://github.com/pelle/oauth-plugin.git
The Generator currently creates code (in particular views) that only work in Rails 2.
It should not be difficult to manually modify the code to work on Rails 1.2.x
I think the only real issue is that the views have .html.erb extensions. So these could theoretically just be renamed to .rhtml.
Please let me know if this works and I will see if I can make the generator conditionally create .rhtml for pre 2.0 versions of RAILS.
While it isn’t very flexible at the moment there is an oauth_provider generator which you can use like this:
./script/generate oauth_provider
This generates OAuth and OAuth client controllers as well as the required models.
It requires an authentication framework such as acts_as_authenticated, restful_authentication or restful_open_id_authentication. It also requires Rails 2.0.
By default the generator generates RSpec and ERB templates. The generator can instead create Test::Unit and/or HAML templates. To do this use the following options:
./script/generate oauth_provider --test-unit --haml
These can of course be used individually as well.
Add the following lines to your user model:
has_many :client_applications has_many :tokens, :class_name=>"OauthToken",:order=>"authorized_at desc",:include=>[:client_application]
The database is defined in:
db/migrate/XXX_create_oauth_tables.rb
Run them as any other normal migration in rails with:
rake db:migrate
As the flow has changed slightly and there are a couple of database changes it isn’t as simple as just updating the plugin. Please follow these steps closely:
You need to add a migration:
script/generate migration upgrade_oauth
Make it look like this:
class UpgradeOauth < ActiveRecord::Migration def self.up add_column :oauth_tokens,:callback_url,:string add_column :oauth_tokens,:verifier,:string,:limit => 20 end def self.down remove_column :oauth_tokens,:callback_url remove_column :oauth_tokens,:verifier end end
There are changes to the following files:
app/models/client_application.rb app/models/request_token.rb app/controllers/oauth_controller.rb
Add the following towards the top of the model class
attr_accessor :token_callback_url
Then change the create_request_token method to the following:
def create_request_token RequestToken.create :client_application =>self,:callback_url=>token_callback_url end
The RequestToken contains the bulk of the changes so it’s easiest to list it in it’s entirety. Mainly we need to add support for the oauth_verifier parameter and also tell the client that we support OAuth 1.0a.
Make sure it looks like this:
class RequestToken < OauthToken attr_accessor :provided_oauth_verifier def authorize!(user) return false if authorized? self.user = user self.authorized_at = Time.now self.verifier=OAuth::Helper.generate_key(16)[0,20] unless oauth10? self.save end def exchange! return false unless authorized? return false unless oauth10? || verifier==provided_oauth_verifier RequestToken.transaction do access_token = AccessToken.create(:user => user, :client_application => client_application) invalidate! access_token end end def to_query if oauth10? super else "#{super}&oauth_callback_confirmed=true" end end def oob? self.callback_url=='oob' end def oauth10? (defined? OAUTH_10_SUPPORT) && OAUTH_10_SUPPORT && self.callback_url.blank? end end
All you need to do here is the change the authorize action to use the request_token callback url and add the oauth_verifier to the callback url.
def authorize @token = ::RequestToken.find_by_token params[:oauth_token] unless @token.invalidated? if request.post? if params[:authorize] == '1' @token.authorize!(current_user) if @token.oauth10? @redirect_url = params[:oauth_callback] || @token.client_application.callback_url else @redirect_url = @token.oob? ? @token.client_application.callback_url : @token.callback_url end if @redirect_url if @token.oauth10? redirect_to "#{@redirect_url}?oauth_token=#{@token.token}" else redirect_to "#{@redirect_url}?oauth_token=#{@token.token}&oauth_verifier=#{@token.verifier}" end else render :action => "authorize_success" end elsif params[:authorize] == "0" @token.invalidate! render :action => "authorize_failure" end end else render :action => "authorize_failure" end end
Alternatively if you haven’t customized your controller you can replace the full controller with this:
require 'oauth/controllers/provider_controller' class OauthController < ApplicationController include OAuth::Controllers::ProviderController end
This way the controller will automatically include bug fixes in future versions of the plugin.
The rest of the changes are in the plugin and will be automatically be included.
Note OAuth 1.0a removes support for callback url’s passed to the authorize page, clients must either define a callback url in their client application or pass one on the token request page.
If you absolutely have to support older OAuth 1.0 clients on an optional basis, we now include a switch to turn it back on.
For legacy OAUTH 1.0 support add the following constant in your environment.rb
OAUTH_10_SUPPORT = true
Note, you should only do this if you really positively require to support old OAuth1.0 clients. There is a serious security issue with this.
I recommend that you think about what your users would want to provide access to and limit oauth for those only. For example in a CRUD controller you may think about if you want to let consumer applications do the create, update or delete actions. For your application this might make sense, but for others maybe not.
If you want to give oauth access to everything a registered user can do, just replace the filter you have in your controllers with:
before_filter :login_or_oauth_required
If you want to restrict consumers to the index and show methods of your controller do the following:
before_filter :login_required,:except=>[:show,:index] before_filter :login_or_oauth_required,:only=>[:show,:index]
If you have an action you only want used via oauth:
before_filter :oauth_required
All of these places the tokens user in current_user as you would expect. It also exposes the following methods:
-
current_token - for accessing the token used to authorize the current request
-
current_client_application - for accessing information about which consumer is currently accessing your request
You could add application specific information to the OauthToken and ClientApplication model for such things as object level access control, billing, expiry etc. Be creative and you can create some really cool applications here.
The oauth_consumer generator creates a controller to manage the authentication flow between your application and any number of external OAuth secured applications that you wish to connect to.
To run it simply run:
./script/generate oauth_consumer
This generates the OauthConsumerController as well as the ConsumerToken model.
By default the generator generates ERB templates. The generator can instead create HAML templates. To do this use the following options:
./script/generate oauth_consumer --haml
All configuration of applications is done in
config/initializers/oauth_consumers.rb
Add entries to OAUTH_CREDENTIALS for all OAuth Applications you wish to connect to. Get this information by registering your application at the particular applications developer page.
OAUTH_CREDENTIALS={
:twitter=>{
:key=>"key",
:secret=>"secret"
},
:agree2=>{
:key=>"key",
:secret=>"secret"
},
:hour_feed=>{
:key=>"",
:secret=>"",
:options={
:site=>"http://hourfeed.com"
}
},
:nu_bux=>{
:key=>"",
:secret=>"",
:super_class=>"OpenTransactToken", # if a OAuth service follows a particular standard
# with a token implementation you can set the superclass
# to use
:options=>{
:site=>"http://nubux.heroku.com"
}
}
}
You can add any of the options that the OAuth::Consumer.new accepts to the options hash: oauth.rubyforge.org/rdoc/classes/OAuth/Consumer.html
:key, :secret are required as well as :options etc. for non custom ConsumerToken services.
For each site setup in the OAUTH_CREDENTIALS hash the plugin goes through and loads or creates a new model class that subclasses ConsumerToken.
eg. If you connect to Yahoo’s FireEagle you would add the :fire_eagle entry to OAUTH_CREDENTIALS and a new FireEagleToken model class will be created on the fly.
This allows you to add a has_one association in your user model:
has_one :fire_eagle,:class_name=>"FireEagleToken", :dependent=>:destroy
And you could do:
@location=@user.fire_eagle.client.location
The client method gives you a OAuth::AccessToken which you can use to perform rest operations on the client site - see oauth.rubyforge.org/rdoc/classes/OAuth/AccessToken.html
Before creating the FireEagleToken model the plugin checks if a class already exists by that name or if we provide an api wrapper for it. This allows you to create a better token model that uses an existing ruby gem.
Currently we provide the following semi tested tokens wrappers:
-
FireEagle
-
Twitter
-
Agree2
These can be found in lib/oauth/models/consulers/services. Contributions will be warmly accepted for your favorite OAuth service.
To connect a user to an external service link or redirect them to:
/oauth_consumers/[SERVICE_NAME]
Where SERVICE_NAME is the name you set in the OAUTH_CREDENTIALS hash. This will request the request token and redirect the user to the services authorization screen. When the user accepts the get redirected back to:
/oauth_consumers/[SERVICE_NAME]/callback
You can specify this url to the service you’re calling when you register, but it will automatically be sent along anyway.
The database is defined in:
db/migrate/XXX_create_oauth_consumer_tokens.rb
Run them as any other normal migration in rails with:
rake db:migrate
The Google Code project is code.google.com/p/oauth-plugin/
The Mailing List for all things OAuth in Ruby is:
groups.google.com/group/oauth-ruby
The Mailing list for everything else OAuth is:
The OAuth Ruby Gem home page is oauth.rubyforge.org
Please help documentation, patches and testing.
Copyright © 2007-2009 Pelle Braendgaard, released under the MIT license