1 files changed, 85 insertions, 0 deletions
diff --git a/app/services/service_desk/custom_emails/create_service.rb b/app/services/service_desk/custom_emails/create_service.rb
new file mode 100644
index 00000000000..c3ca98a0259
--- /dev/null
+++ b/app/services/service_desk/custom_emails/create_service.rb
@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+
+module ServiceDesk
+  module CustomEmails
+    class CreateService < BaseService
+      def execute
+        return error_feature_flag_disabled unless feature_flag_enabled?
+        return error_user_not_authorized unless legitimate_user?
+        return error_params_missing unless has_required_params?
+        return error_custom_email_exists if credential? || verification?
+
+        return error_cannot_create_custom_email unless create_credential
+
+        if update_settings.error?
+          # We don't warp everything in a single transaction here and roll it back
+          # because ServiceDeskSettings::UpdateService uses safe_find_or_create_by!
+          rollback_credential
+          return error_cannot_create_custom_email
+        end
+
+        project.reset
+
+        # The create service may return an error response if the verification fails early.
+        # Here We want to indicate whether adding a custom email address was successful, so
+        # we don't use its response here.
+        create_verification
+
+        ServiceResponse.success
+      end
+
+      private
+
+      def update_settings
+        ServiceDeskSettings::UpdateService.new(project, current_user, create_setting_params).execute
+      end
+
+      def rollback_credential
+        ::ServiceDesk::CustomEmailCredential.find_by_project_id(project.id)&.destroy
+      end
+
+      def create_credential
+        credential = ::ServiceDesk::CustomEmailCredential.new(create_credential_params.merge(project: project))
+        credential.save
+      end
+
+      def create_verification
+        ::ServiceDesk::CustomEmailVerifications::CreateService.new(project: project, current_user: current_user).execute
+      end
+
+      def create_setting_params
+        ensure_params.permit(:custom_email)
+      end
+
+      def create_credential_params
+        ensure_params.permit(:smtp_address, :smtp_port, :smtp_username, :smtp_password)
+      end
+
+      def ensure_params
+        return params if params.is_a?(ActionController::Parameters)
+
+        ActionController::Parameters.new(params)
+      end
+
+      def has_required_params?
+        required_keys.all? { |key| params.key?(key) && params[key].present? }
+      end
+
+      def required_keys
+        %i[custom_email smtp_address smtp_port smtp_username smtp_password]
+      end
+
+      def error_custom_email_exists
+        error_response(s_('ServiceDesk|Custom email already exists'))
+      end
+
+      def error_params_missing
+        error_response(s_('ServiceDesk|Parameters missing'))
+      end
+
+      def error_cannot_create_custom_email
+        error_response(s_('ServiceDesk|Cannot create custom email'))
+      end
+    end
+  end
+end