Added missing handler for SSO callbacks

app/controllers/users/omniauth_callbacks_controller.rb

@@ -0,0 +1,44 @@
+class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
+
+  def passthru
+    raise
+    send(params[:provider]) if providers.include?(params[:provider])
+  end
+
+  def launchpad
+    # You need to implement the method below in your model (e.g. app/models/user.rb)
+    @user = User.from_omniauth(request.env["omniauth.auth"])
+
+    if @user.persisted?
+      flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Launchpad"
+      sign_in_and_redirect @user, :event => :authentication
+    else
+    #   session["devise.google_data"] = request.env["omniauth.auth"].except(:extra) #Removing extra as it can overflow some session stores
+      redirect_to new_user_session_url, alert: @user.errors.full_messages.join("\n")
+    end
+
+  end
+
+  def google_oauth2
+    # You need to implement the method below in your model (e.g. app/models/user.rb)
+    @user = User.from_omniauth(request.env["omniauth.auth"])
+
+    if @user.persisted?
+      flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Google"
+      sign_in_and_redirect @user, :event => :authentication
+    else
+    #   session["devise.google_data"] = request.env["omniauth.auth"].except(:extra) #Removing extra as it can overflow some session stores
+      redirect_to new_user_session_url, alert: @user.errors.full_messages.join("\n")
+    end
+  end
+
+  def failure
+    redirect_to root_path
+  end
+
+  private
+
+  def providers
+    ["twitter", "google_oauth2"]
+  end
+end