OBS SSO implementation

This is work in progress, see https://phabricator.apertis.org/T7891.

src/api/app/controllers/webui/user_controller.rb

@@ -6,7 +6,7 @@ class Webui::UserController < Webui::WebuiController
   before_filter :require_login, :only => [:edit, :save, :notifications, :update_notifications, :index]
   before_filter :require_admin, :only => [:edit, :delete, :lock, :confirm, :admin, :index]
 
-  skip_before_action :check_anonymous, only: [:do_login]
+  skip_before_action :check_anonymous, only: [:do_login, :sso, :login]
 
   def index
     @users = User.all_without_nobody
@@ -25,6 +25,7 @@ class Webui::UserController < Webui::WebuiController
   end
 
   def login
+      sso
   end
 
   def do_login
@@ -267,6 +268,13 @@ class Webui::UserController < Webui::WebuiController
     redirect_to action: :notifications
   end
 
+  def sso
+    @sso_methods = {}
+    CONFIG['sso_auth'].each do |name, options|
+      @sso_methods[name.to_sym] = options['description'] || OmniAuth::Utils.camelize(name)
+    end
+  end
+
   protected
 
   def list_users(prefix = nil, hash = nil)