OpenId Authentication For Rails3

OpenId Authentication For Rails3

1. Add Gem

GemFile

gem 'ruby-openid'
gem 'rack-openid', '>=0.2.1', :require => 'rack/openid'

2. install open_id_authentication as a plugin

cd vendor/plugins

git clone git://github.com/rails/open_id_authentication.git

3. Modify vendor/plugins/open_id_authentication/init.rb

remove code

if Rails.version < '3'
  config.gem 'rack-openid', :lib => 'rack/openid', :version => '>=0.2.1'
end

Because your rails is 3.0.0.


4. Add OpenId Authentication

SessionController

def create
    logout_keeping_session!
    if using_open_id?
      open_id_authentication
    else
      user = User.authenticate(params[:login], params[:password])
    .....
end


def open_id_authentication(identity_url = nil)
    # Pass optional :required and :optional keys to specify what sreg fields you want.
    # Be sure to yield registration, a third argument in the #authenticate_with_open_id block.
    authenticate_with_open_id(identity_url,
      :required => [ :nickname, :email ],
      :optional => :fullname) do |result, identifier, registration|
      case result.status
      when :missing
        note_failed_signin "Sorry, the OpenID server couldn't be found"
      when :invalid
        note_failed_signin "Sorry, but this does not appear to be a valid OpenID"
      when :canceled
        note_failed_signin "OpenID verification was canceled"
      when :failed
        note_failed_signin "Sorry, the OpenID verification failed"
      when :successful
        if @current_user = User.where("open_id LIKE ?", "%#{identifier}%").first
          self.current_user = @current_user
          flash[:notice] = "Logged in successfully"
        else
          note_failed_signin "Sorry, no user by that identity URL exists"
        end
      end
      redirect_back_or_default('/')
    end

  def note_failed_signin(msg = nil)
    flash[:error] = msg || "Couldn't log you in as '#{params[:login]}'"
    logger.warn(msg || "Failed login for '#{params[:login]}' from #{request.remote_ip} at #{Time.now.utc}")
  end

Page: create.rhtml.erb

 <%= form_tag session_path do -%>
    <fieldset>
      <legend>Log In</legend>

      <dl>
        <dt><%= label_tag 'login' %></dt>
        <dd><%= text_field_tag 'login', @login %></dd>
      </dl>
      <dl>
        <dt><%= label_tag 'password' %> </dt>   
        <dd><%= password_field_tag 'password', nil %></dd>
      </dl>
      <!-- Uncomment this if you want this functionality-->
      <dl>
        <dt><%= label_tag 'remember_me', 'Remember me' %></dt>
        <dd><%= check_box_tag 'remember_me', '1', @remember_me %></dd>
      </dl>
      <dl>
        Or
      </dl>
      <dl>
        <dt><%= label_tag 'openid_identifier', 'OpenID' %></dt>
        <dd><%= text_field_tag 'openid_identifier' %></dd>
      </dl>
      <dl>
        <%= submit_tag 'Log in', :class=>"button" %>
      </dl>
      <p style="color: red"><%= flash[:error] unless flash[:error].nil? %></p>
    </fieldset>
  <% end -%>

User model should add a open_id column.