Expand TARA auth flow to registrant portal

app/controllers/registrant/tara_controller.rb

@@ -0,0 +1,33 @@
+class Registrant
+  class TaraController < ApplicationController
+    skip_authorization_check
+
+    # rubocop:disable Style/AndOr
+    def callback
+      session[:omniauth_hash] = user_hash
+      @registrant_user = RegistrantUser.find_or_create_by_omniauth_data(user_hash)
+
+      if @registrant_user
+        flash[:notice] = t(:signed_in_successfully)
+        sign_in_and_redirect(:registrant_user, @registrant_user)
+      else
+        show_error and return
+      end
+    end
+    # rubocop:enable Style/AndOr
+
+    def cancel
+      redirect_to root_path, notice: t(:sign_in_cancelled)
+    end
+
+    def show_error
+      redirect_to new_registrant_user_session_url, alert: t(:no_such_user)
+    end
+
+    private
+
+    def user_hash
+      request.env['omniauth.auth']
+    end
+  end
+end

app/models/registrant_user.rb

@@ -66,23 +66,19 @@ class RegistrantUser < User
       find_or_create_by_user_data(user_data)
     end
 
-    def find_or_create_by_mid_data(response)
-      user_data = { first_name: response.user_givenname, last_name: response.user_surname,
-                    ident: response.user_id_code, country_code: response.user_country }
+    def find_or_create_by_omniauth_data(omniauth_hash)
+      uid = omniauth_hash['uid']
+      identity_code = uid.slice(2..-1)
+      country_code = uid.slice(0..1)
+      first_name = omniauth_hash.dig('info', 'first_name')
+      last_name = omniauth_hash.dig('info', 'last_name')
+
+      user_data = { first_name: first_name, last_name: last_name,
+        ident: identity_code, country_code: country_code }
 
       find_or_create_by_user_data(user_data)
     end
 
-    def find_by_id_card(id_card)
-      registrant_ident = "#{id_card.country_code}-#{id_card.personal_code}"
-      username = [id_card.first_name, id_card.last_name].join("\s")
-
-      user = find_or_initialize_by(registrant_ident: registrant_ident)
-      user.username = username
-      user.save!
-      user
-    end
-
     private
 
     def find_or_create_by_user_data(user_data = {})

app/views/registrant/sessions/new.html.erb

@@ -8,11 +8,6 @@
             <%= t '.hint' %>
         </div>
         <br/>
-        <%= link_to '/registrant/login/mid' do %>
-            <%= image_tag 'mid.gif' %>
-        <% end %>
-        <%= link_to registrant_id_card_sign_in_path, method: :post do %>
-            <%= image_tag 'id_card.gif' %>
-        <% end %>
+        <%= link_to t(:sign_in), "/auth/rant_tara", method: :post, class: 'btn btn-lg btn-primary btn-block' %>
     </div>
-</div>
+</div>