Support toggling service desk from API

- service_desk_enabled boolean attribute

changelogs/unreleased/34261-toggle-service-desk.yml

+---
+title: Support toggling service desk from API
+merge_request: 21627
+author:
+type: changed

doc/api/projects.md

@@ -1135,6 +1135,7 @@ PUT /projects/:id
 | `only_mirror_protected_branches` | boolean | no | **(STARTER)** Only mirror protected branches |
 | `mirror_overwrites_diverged_branches` | boolean | no | **(STARTER)** Pull mirror overwrites diverged branches |
 | `packages_enabled` | boolean | no | **(PREMIUM ONLY)** Enable or disable packages repository feature |
+| `service_desk_enabled` | boolean | no | **(PREMIUM ONLY)** Enable or disable service desk feature |
 
 NOTE: **Note:** If your HTTP repository is not publicly accessible,
 add authentication information to the URL: `https://username:password@gitlab.company.com/group/project.git`

ee/lib/ee/api/helpers/projects_helpers.rb

@@ -21,6 +21,7 @@ module EE
             optional :mirror, type: Grape::API::Boolean, desc: 'Enables pull mirroring in a project'
             optional :mirror_trigger_builds, type: Grape::API::Boolean, desc: 'Pull mirroring triggers builds'
             optional :external_authorization_classification_label, type: String, desc: 'The classification label for the project'
+            optional :service_desk_enabled, type: Grape::API::Boolean, desc: 'Disable or enable the service desk'
           end
 
           params :optional_filter_params_ee do
@@ -53,7 +54,8 @@ module EE
               :external_authorization_classification_label,
               :import_url,
               :packages_enabled,
-              :fallback_approvals_required
+              :fallback_approvals_required,
+              :service_desk_enabled
             ]
           end
         end

ee/spec/requests/api/projects_spec.rb

@@ -449,6 +449,27 @@ describe API::Projects do
       end
     end
 
+    context 'when updating service desk' do
+      subject { put(api("/projects/#{project.id}", user), params: { service_desk_enabled: true }) }
+
+      before do
+        stub_licensed_features(service_desk: true)
+        project.update!(service_desk_enabled: false)
+
+        allow(::Gitlab::IncomingEmail).to receive(:enabled?).and_return(true)
+      end
+
+      it 'returns 200' do
+        subject
+
+        expect(response).to have_gitlab_http_status(200)
+      end
+
+      it 'enables the service_desk' do
+        expect { subject }.to change { project.reload.service_desk_enabled }.to(true)
+      end
+    end
+
     context 'when updating repository storage' do
       let(:unknown_storage) { 'new-storage' }
       let(:new_project) { create(:project, :repository, namespace: user.namespace) }