refactor: extract agent_connect logout_url to a agent_connect_service

app/controllers/users/sessions_controller.rb

@@ -59,7 +59,8 @@ class Users::SessionsController < Devise::SessionsController
       end
 
       if agent_connect_id_token.present?
-        return redirect_to build_agent_connect_logout_url(agent_connect_id_token), allow_other_host: true
+        return redirect_to AgentConnectService.logout_url(agent_connect_id_token, host_with_port: request.host_with_port),
+          allow_other_host: true
       end
     end
 
@@ -110,11 +111,4 @@ class Users::SessionsController < Devise::SessionsController
   def logout
     redirect_to root_path, notice: I18n.t('devise.sessions.signed_out')
   end
-
-  private
-
-  def build_agent_connect_logout_url(id_token)
-    h = { id_token_hint: id_token, post_logout_redirect_uri: logout_url }
-    "#{AGENT_CONNECT[:end_session_endpoint]}?#{h.to_query}"
-  end
 end

app/services/agent_connect_service.rb

@@ -39,6 +39,12 @@ class AgentConnectService
     [access_token.userinfo!.raw_attributes, access_token.id_token, amr]
   end
 
+  def self.logout_url(id_token, host_with_port:)
+    app_logout = Rails.application.routes.url_helpers.logout_url(host: host_with_port)
+    h = { id_token_hint: id_token, post_logout_redirect_uri: app_logout }
+    "#{AGENT_CONNECT[:end_session_endpoint]}?#{h.to_query}"
+  end
+
   private
 
   # TODO: remove this block when migration to new domain is done

spec/services/agent_connect_service_spec.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+describe AgentConnectService do
+  describe '.logout_url' do
+    let(:id_token) { 'id_token' }
+
+    before do
+      ::AGENT_CONNECT ||= {}
+      allow(AGENT_CONNECT).to receive(:[])
+        .with(:end_session_endpoint).and_return("https://agent-connect.fr/logout")
+    end
+
+    subject { described_class.logout_url(id_token, host_with_port: 'test.host') }
+
+    it 'returns the correct url' do
+      expect(subject).to eq("https://agent-connect.fr/logout?id_token_hint=id_token&post_logout_redirect_uri=http%3A%2F%2Ftest.host%2Flogout")
+    end
+  end
+end