Add Operations::FeatureFlags::UserList model

Add AtomicInternalId for model

app/models/internal_id_enums.rb

@@ -3,7 +3,7 @@
 module InternalIdEnums
   def self.usage_resources
     # when adding new resource, make sure it doesn't conflict with EE usage_resources
-    { issues: 0, merge_requests: 1, deployments: 2, milestones: 3, epics: 4, ci_pipelines: 5, operations_feature_flags: 6 }
+    { issues: 0, merge_requests: 1, deployments: 2, milestones: 3, epics: 4, ci_pipelines: 5, operations_feature_flags: 6, operations_user_lists: 7 }
   end
 end
 

changelogs/unreleased/ff-lists-api.yml

+---
+title: Add public API for feature flag user lists
+merge_request: 29415
+author:
+type: added

doc/api/api_resources.md

@@ -31,6 +31,8 @@ The following API resources are available in the project context:
 | [Environments](environments.md)                                     | `/projects/:id/environments`                                                                                                                                                                          |
 | [Error Tracking](error_tracking.md)                        | `/projects/:id/error_tracking/settings`                                                                                                                                                |
 | [Events](events.md)                                                 | `/projects/:id/events` (also available for users and standalone)                                                                                                                                      |
+| [Feature Flags](feature_flags.md)                                   | `/projects/:id/feature_flags`                                                                                                                                                                         |
+| [Feature Flag User Lists](feature_flag_user_lists.md)               | `/projects/:id/feature_flags_user_lists`                                                                                                                                                              |
 | [Issues](issues.md)                                                 | `/projects/:id/issues` (also available for groups and standalone)                                                                                                                                     |
 | [Issues Statistics](issues_statistics.md)                           | `/projects/:id/issues_statistics` (also available for groups and standalone)                                                                                                                          |
 | [Issue boards](boards.md)                                           | `/projects/:id/boards`                                                                                                                                                                                |

doc/api/feature_flag_user_lists.md

+# Feature Flag User Lists API **(PREMIUM)**
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/205409) in [GitLab Premium](https://about.gitlab.com/pricing/) 12.10.
+
+API for accessing GitLab Feature Flag User Lists.
+
+Users with Developer or higher [permissions](../user/permissions.md) can access the Feature Flag User Lists API.
+
+NOTE: **Note:**
+`GET` requests return twenty results at a time because the API results
+are [paginated](README.md#pagination). You can change this value.
+
+## List all feature flag user lists for a project
+
+Gets all feature flag user lists for the requested project.
+
+```plaintext
+GET /projects/:id/feature_flags_user_lists
+```
+
+| Attribute           | Type             | Required   | Description                                                                                                                 |
+| ------------------- | ---------------- | ---------- | --------------------------------------------------------------------------------------------------------------------------- |
+| `id`                | integer/string   | yes        | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding).                                            |
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/projects/1/feature_flags_user_lists
+```
+
+Example response:
+
+```json
+[
+   {
+      "name": "user_list",
+      "user_xids": "user1,user2",
+      "id": 1,
+      "iid": 1,
+      "project_id": 1,
+      "created_at": "2020-02-04T08:13:51.423Z",
+      "updated_at": "2020-02-04T08:13:51.423Z"
+   },
+   {
+      "name": "test_users",
+      "user_xids": "user3,user4,user5",
+      "id": 2,
+      "iid": 2,
+      "project_id": 1,
+      "created_at": "2020-02-04T08:13:10.507Z",
+      "updated_at": "2020-02-04T08:13:10.507Z"
+   }
+]
+```
+
+## Create a feature flag user list
+
+Creates a feature flag user list.
+
+```plaintext
+POST /projects/:id/feature_flags_user_lists
+```
+
+| Attribute           | Type             | Required   | Description                                                                            |
+| ------------------- | ---------------- | ---------- | ---------------------------------------------------------------------------------------|
+| `id`                | integer/string   | yes        | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding).       |
+| `name`              | string           | yes        | The name of the feature flag. |
+| `user_xids`         | string           | yes        | A comma separated list of user ids. |
+
+```shell
+curl https://gitlab.example.com/api/v4/projects/1/feature_flags_user_lists \
+     --header "PRIVATE-TOKEN: <your_access_token>" \
+     --header "Content-type: application/json" \
+     --data @- << EOF
+{
+    "name": "my_user_list",
+    "user_xids": "user1,user2,user3"
+}
+EOF
+```
+
+Example response:
+
+```json
+{
+   "name": "my_user_list",
+   "user_xids": "user1,user2,user3",
+   "id": 1,
+   "iid": 1,
+   "project_id": 1,
+   "created_at": "2020-02-04T08:32:27.288Z",
+   "updated_at": "2020-02-04T08:32:27.288Z"
+}
+```
+
+## Get a feature flag user list
+
+Gets a feature flag user list.
+
+```plaintext
+GET /projects/:id/feature_flags_user_lists/:iid
+```
+
+| Attribute           | Type             | Required   | Description                                                                            |
+| ------------------- | ---------------- | ---------- | ---------------------------------------------------------------------------------------|
+| `id`                | integer/string   | yes        | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding).       |
+| `iid`               | integer/string   | yes        | The internal ID of the project's feature flag user list.                               |
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/projects/1/feature_flags_user_lists/1
+```
+
+Example response:
+
+```json
+{
+   "name": "my_user_list",
+   "user_xids": "123,456",
+   "id": 1,
+   "iid": 1,
+   "project_id": 1,
+   "created_at": "2020-02-04T08:13:10.507Z",
+   "updated_at": "2020-02-04T08:13:10.507Z",
+}
+```
+
+## Delete feature flag user list
+
+Deletes a feature flag user list.
+
+```plaintext
+DELETE /projects/:id/feature_flags_user_lists/:iid
+```
+
+| Attribute           | Type             | Required   | Description                                                                            |
+| ------------------- | ---------------- | ---------- | ---------------------------------------------------------------------------------------|
+| `id`                | integer/string   | yes        | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding).       |
+| `iid`               | integer/string   | yes        | The internal ID of the project's feature flag user list                                |
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" --request DELETE https://gitlab.example.com/api/v4/projects/1/feature_flags_user_lists/1
+```

doc/user/project/operations/feature_flags.md

@@ -265,3 +265,4 @@ to control them in an automated flow:
 
 - [Feature Flags API](../../../api/feature_flags.md)
 - [Feature Flag Specs API](../../../api/feature_flag_specs.md)
+- [Feature Flag User Lists API](../../../api/feature_flag_user_lists.md)

ee/app/models/ee/project.rb

@@ -85,6 +85,7 @@ module EE
 
       has_many :operations_feature_flags, class_name: 'Operations::FeatureFlag'
       has_one :operations_feature_flags_client, class_name: 'Operations::FeatureFlagsClient'
+      has_many :operations_feature_flags_user_lists, class_name: 'Operations::FeatureFlags::UserList'
 
       has_many :project_aliases
 

ee/app/models/operations/feature_flags/user_list.rb

+# frozen_string_literal: true
+
+module Operations
+  module FeatureFlags
+    class UserList < ApplicationRecord
+      include AtomicInternalId
+
+      USERXID_MAX_LENGTH = 256
+
+      self.table_name = 'operations_user_lists'
+
+      belongs_to :project
+
+      has_internal_id :iid, scope: :project, init: ->(s) { s&.project&.operations_feature_flags_user_lists&.maximum(:iid) }, presence: true
+
+      validates :project, presence: true
+      validates :name,
+        presence: true,
+        uniqueness: { scope: :project_id },
+        length: 1..255
+      validate :user_xids_validation
+
+      private
+
+      def user_xids_validation
+        unless user_xids.is_a?(String) && !user_xids.match(/[\n\r\t]|,,/) && valid_xids?(user_xids.split(","))
+          errors.add(:user_xids,
+                     "user_xids must be a string of unique comma separated values each #{USERXID_MAX_LENGTH} characters or less")
+        end
+      end
+
+      def valid_xids?(user_xids)
+        user_xids.uniq.length == user_xids.length &&
+          user_xids.all? { |xid| valid_xid?(xid) }
+      end
+
+      def valid_xid?(user_xid)
+        user_xid.present? &&
+          user_xid.strip == user_xid &&
+          user_xid.length <= USERXID_MAX_LENGTH
+      end
+    end
+  end
+end

ee/app/policies/ee/project_policy.rb

@@ -182,6 +182,7 @@ module EE
         enable :update_feature_flag
         enable :destroy_feature_flag
         enable :admin_feature_flag
+        enable :admin_feature_flags_user_lists
         enable :create_design
         enable :destroy_design
       end
@@ -218,6 +219,7 @@ module EE
 
       rule { feature_flags_disabled | repository_disabled }.policy do
         prevent(*create_read_update_admin_destroy(:feature_flag))
+        prevent(:admin_feature_flags_user_lists)
       end
 
       rule { can?(:maintainer_access) }.policy do

ee/lib/api/feature_flags_user_lists.rb

+# frozen_string_literal: true
+
+module API
+  class FeatureFlagsUserLists < Grape::API
+    include PaginationParams
+
+    error_formatter :json, -> (message, _backtrace, _options, _env, _original_exception) {
+      message.is_a?(String) ? { message: message }.to_json : message.to_json
+    }
+
+    before do
+      authorize_admin_feature_flags_user_lists!
+    end
+
+    params do
+      requires :id, type: String, desc: 'The ID of a project'
+    end
+    resource 'projects/:id', requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+      resource :feature_flags_user_lists do
+        desc 'Get all feature flags user lists of a project' do
+          detail 'This feature was introduced in GitLab 12.10'
+          success EE::API::Entities::FeatureFlag::UserList
+        end
+        params do
+          use :pagination
+        end
+        get do
+          present paginate(user_project.operations_feature_flags_user_lists),
+            with: EE::API::Entities::FeatureFlag::UserList
+        end
+
+        desc 'Create a feature flags user list for a project' do
+          detail 'This feature was introduced in GitLab 12.10'
+          success EE::API::Entities::FeatureFlag::UserList
+        end
+        params do
+          requires :name, type: String, desc: 'The name of the list'
+          requires :user_xids, type: String, desc: 'A comma separated list of external user ids'
+        end
+        post do
+          list = user_project.operations_feature_flags_user_lists.create(declared_params)
+
+          if list.save
+            present list, with: EE::API::Entities::FeatureFlag::UserList
+          else
+            render_api_error!(list.errors.full_messages, :bad_request)
+          end
+        end
+      end
+
+      params do
+        requires :iid, type: String, desc: 'The internal id of the user list'
+      end
+      resource 'feature_flags_user_lists/:iid' do
+        desc 'Get a single feature flag user list belonging to a project' do
+          detail 'This feature was introduced in GitLab 12.10'
+          success EE::API::Entities::FeatureFlag::UserList
+        end
+        get do
+          present user_project.operations_feature_flags_user_lists.find_by_iid!(params[:iid]),
+            with: EE::API::Entities::FeatureFlag::UserList
+        end
+
+        desc 'Update a feature flag user list' do
+          detail 'This feature was introduced in GitLab 12.10'
+          success EE::API::Entities::FeatureFlag::UserList
+        end
+        params do
+          optional :name, type: String, desc: 'The name of the list'
+          optional :user_xids, type: String, desc: 'A comma separated list of external user ids'
+        end
+        put do
+          list = user_project.operations_feature_flags_user_lists.find_by_iid!(params[:iid])
+
+          if list.update(declared_params(include_missing: false))
+            present list, with: EE::API::Entities::FeatureFlag::UserList
+          else
+            render_api_error!(list.errors.full_messages, :bad_request)
+          end
+        end
+
+        desc 'Delete a feature flag user list' do
+          detail 'This feature was introduced in GitLab 12.10'
+        end
+        delete do
+          list = user_project.operations_feature_flags_user_lists.find_by_iid!(params[:iid])
+          list.destroy
+        end
+      end
+    end
+
+    helpers do
+      def authorize_admin_feature_flags_user_lists!
+        authorize! :admin_feature_flags_user_lists, user_project
+      end
+    end
+  end
+end

ee/lib/ee/api/api.rb

@@ -21,6 +21,7 @@ module EE
         mount ::API::Epics
         mount ::API::ElasticsearchIndexedNamespaces
         mount ::API::FeatureFlags
+        mount ::API::FeatureFlagsUserLists
         mount ::API::FeatureFlagScopes
         mount ::API::Geo
         mount ::API::GeoReplication

ee/lib/ee/api/entities/feature_flag/user_list.rb

+# frozen_string_literal: true
+
+module EE
+  module API
+    module Entities
+      class FeatureFlag < Grape::Entity
+        class UserList < Grape::Entity
+          expose :id
+          expose :iid
+          expose :project_id
+          expose :created_at
+          expose :updated_at
+          expose :name
+          expose :user_xids
+        end
+      end
+    end
+  end
+end

ee/spec/factories/operations/feature_flags/user_list.rb

+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :operations_feature_flag_user_list, class: 'Operations::FeatureFlags::UserList' do
+    association :project, factory: :project
+    name { 'My User List' }
+    user_xids { 'user1,user2,user3' }
+  end
+end

ee/spec/models/operations/feature_flags/user_list_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Operations::FeatureFlags::UserList do
+  subject { create(:operations_feature_flag_user_list) }
+
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:project) }
+    it { is_expected.to validate_presence_of(:name) }
+    it { is_expected.to validate_uniqueness_of(:name).scoped_to(:project_id) }
+    it { is_expected.to validate_length_of(:name).is_at_least(1).is_at_most(255) }
+
+    describe 'user_xids' do
+      where(:valid_value) do
+        ["", "sam", "1", "a", "uuid-of-some-kind", "sam,fred,tom,jane,joe,mike",
+         "gitlab@example.com", "123,4", "UPPER,Case,charActeRS", "0",
+         "$valid$email#2345#$%..{}+=-)?\\/@example.com", "spaces allowed",
+         "a" * 256, "a,#{'b' * 256},ccc", "many    spaces"]
+      end
+      with_them do
+        it 'is valid with a string of comma separated values' do
+          user_list = described_class.create(user_xids: valid_value)
+
+          expect(user_list.errors[:user_xids]).to be_empty
+        end
+      end
+
+      where(:typecast_value) do
+        [1, 2.5, {}, []]
+      end
+      with_them do
+        it 'automatically casts values of other types' do
+          user_list = described_class.create(user_xids: typecast_value)
+
+          expect(user_list.errors[:user_xids]).to be_empty
+          expect(user_list.user_xids).to eq(typecast_value.to_s)
+        end
+      end
+
+      where(:invalid_value) do
+        [nil, "123\n456", "1,2,3,12\t3", "\n", "\n\r",
+         "joe\r,sam", "1,2,2", "1,,2", "1,2,,,,", "b" * 257, "1, ,2", "tim,    ,7", " ",
+         "    ", " ,1", "1,  ", " leading,1", "1,trailing  ", "1, both ,2"]
+      end
+      with_them do
+        it 'is invalid' do
+          user_list = described_class.create(user_xids: invalid_value)
+
+          expect(user_list.errors[:user_xids]).to include(
+            'user_xids must be a string of unique comma separated values each 256 characters or less'
+          )
+        end
+      end
+    end
+  end
+
+  it_behaves_like 'AtomicInternalId' do
+    let(:internal_id_attribute) { :iid }
+    let(:instance) { build(:operations_feature_flag_user_list) }
+    let(:scope) { :project }
+    let(:scope_attrs) { { project: instance.project } }
+    let(:usage) { :operations_user_lists }
+  end
+end

ee/spec/requests/api/feature_flags_user_lists_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe API::FeatureFlagsUserLists do
+  let_it_be(:project) { create(:project) }
+  let_it_be(:developer) { create(:user) }
+  let_it_be(:reporter) { create(:user) }
+
+  before_all do
+    project.add_developer(developer)
+    project.add_reporter(reporter)
+  end
+
+  before do
+    stub_licensed_features(feature_flags: true)
+  end
+
+  def create_list(name: 'mylist', user_xids: 'user1')
+    create(:operations_feature_flag_user_list, project: project, name: name, user_xids: user_xids)
+  end
+
+  describe 'GET /projects/:id/feature_flags_user_lists' do
+    it 'forbids the request for a reporter' do
+      get api("/projects/#{project.id}/feature_flags_user_lists", reporter)
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+
+    it 'returns forbidden if the feature is unavailable' do
+      stub_licensed_features(feature_flags: false)
+
+      get api("/projects/#{project.id}/feature_flags_user_lists", developer)
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+
+    it 'returns all the user lists' do
+      create_list(name: 'list_a', user_xids: 'user1')
+      create_list(name: 'list_b', user_xids: 'user1,user2,user3')
+
+      get api("/projects/#{project.id}/feature_flags_user_lists", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response.map { |list| list['name'] }.sort).to eq(%w[list_a list_b])
+    end
+
+    it 'returns all the data for a user list' do
+      user_list = create_list(name: 'list_a', user_xids: 'user1')
+
+      get api("/projects/#{project.id}/feature_flags_user_lists", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response).to eq([{
+        'id' => user_list.id,
+        'iid' => user_list.iid,
+        'project_id' => project.id,
+        'created_at' => user_list.created_at.as_json,
+        'updated_at' => user_list.updated_at.as_json,
+        'name' => 'list_a',
+        'user_xids' => 'user1'
+      }])
+    end
+
+    it 'paginates user lists' do
+      create_list(name: 'list_a', user_xids: 'user1')
+      create_list(name: 'list_b', user_xids: 'user1,user2,user3')
+
+      get api("/projects/#{project.id}/feature_flags_user_lists?page=2&per_page=1", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response.map { |list| list['name'] }).to eq(['list_b'])
+    end
+
+    it 'returns the user lists for only the specified project' do
+      create(:operations_feature_flag_user_list, project: project, name: 'list')
+      other_project = create(:project)
+      create(:operations_feature_flag_user_list, project: other_project, name: 'other_list')
+
+      get api("/projects/#{project.id}/feature_flags_user_lists", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response.map { |list| list['name'] }).to eq(['list'])
+    end
+
+    it 'returns an empty list' do
+      get api("/projects/#{project.id}/feature_flags_user_lists", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response).to eq([])
+    end
+  end
+
+  describe 'GET /projects/:id/feature_flags_user_lists/:iid' do
+    it 'forbids the request for a reporter' do
+      list = create_list
+
+      get api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", reporter)
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+
+    it 'returns forbidden if the feature is unavailable' do
+      stub_licensed_features(feature_flags: false)
+      list = create_list
+
+      get api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer)
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+
+    it 'returns the feature flag' do
+      list = create_list(name: 'testers', user_xids: 'test1,test2')
+
+      get api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response).to eq({
+        'name' => 'testers',
+        'user_xids' => 'test1,test2',
+        'id' => list.id,
+        'iid' => list.iid,
+        'project_id' => project.id,
+        'created_at' => list.created_at.as_json,
+        'updated_at' => list.updated_at.as_json
+      })
+    end
+
+    it 'returns the correct feature flag identified by the iid' do
+      create_list(name: 'list_a', user_xids: 'test1')
+      list_b = create_list(name: 'list_b', user_xids: 'test2')
+
+      get api("/projects/#{project.id}/feature_flags_user_lists/#{list_b.iid}", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response['name']).to eq('list_b')
+    end
+
+    it 'scopes the iid search to the project' do
+      other_project = create(:project)
+      other_project.add_developer(developer)
+      create(:operations_feature_flag_user_list, project: other_project, name: 'other_list')
+      list = create(:operations_feature_flag_user_list, project: project, name: 'list')
+
+      get api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response['name']).to eq('list')
+    end
+
+    it 'returns not found when the list does not exist' do
+      get api("/projects/#{project.id}/feature_flags_user_lists/1", developer)
+
+      expect(response).to have_gitlab_http_status(:not_found)
+      expect(json_response).to eq({ 'message' => '404 Not found' })
+    end
+  end
+
+  describe 'POST /projects/:id/feature_flags_user_lists' do
+    it 'forbids the request for a reporter' do
+      post api("/projects/#{project.id}/feature_flags_user_lists", reporter), params: {
+        name: 'mylist', user_xids: 'user1'
+      }
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+      expect(project.operations_feature_flags_user_lists.count).to eq(0)
+    end
+
+    it 'returns forbidden if the feature is unavailable' do
+      stub_licensed_features(feature_flags: false)
+
+      post api("/projects/#{project.id}/feature_flags_user_lists", developer), params: {
+        name: 'mylist', user_xids: 'user1'
+      }
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+
+    it 'creates the flag' do
+      post api("/projects/#{project.id}/feature_flags_user_lists", developer), params: {
+        name: 'mylist', user_xids: 'user1'
+      }
+
+      expect(response).to have_gitlab_http_status(:created)
+      expect(json_response.slice('name', 'user_xids', 'project_id', 'iid')).to eq({
+        'name' => 'mylist',
+        'user_xids' => 'user1',
+        'project_id' => project.id,
+        'iid' => 1
+      })
+      expect(project.operations_feature_flags_user_lists.count).to eq(1)
+      expect(project.operations_feature_flags_user_lists.last.name).to eq('mylist')
+    end
+
+    it 'requires name' do
+      post api("/projects/#{project.id}/feature_flags_user_lists", developer), params: {
+        user_xids: 'user1'
+      }
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+      expect(json_response).to eq({ 'message' => 'name is missing' })
+      expect(project.operations_feature_flags_user_lists.count).to eq(0)
+    end
+
+    it 'requires user_xids' do
+      post api("/projects/#{project.id}/feature_flags_user_lists", developer), params: {
+        name: 'empty_list'
+      }
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+      expect(json_response).to eq({ 'message' => 'user_xids is missing' })
+      expect(project.operations_feature_flags_user_lists.count).to eq(0)
+    end
+
+    it 'returns an error when name is already taken' do
+      create_list(name: 'myname')
+      post api("/projects/#{project.id}/feature_flags_user_lists", developer), params: {
+        name: 'myname', user_xids: 'a'
+      }
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+      expect(json_response).to eq({ 'message' => ['Name has already been taken'] })
+      expect(project.operations_feature_flags_user_lists.count).to eq(1)
+    end
+
+    it 'does not create a flag for a project of which the developer is not a member' do
+      other_project = create(:project)
+
+      post api("/projects/#{other_project.id}/feature_flags_user_lists", developer), params: {
+        name: 'mylist', user_xids: 'user1'
+      }
+
+      expect(response).to have_gitlab_http_status(:not_found)
+      expect(other_project.operations_feature_flags_user_lists.count).to eq(0)
+      expect(project.operations_feature_flags_user_lists.count).to eq(0)
+    end
+  end
+
+  describe 'PUT /projects/:id/feature_flags_user_lists/:iid' do
+    it 'forbids the request for a reporter' do
+      list = create_list(name: 'original_name')
+
+      put api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", reporter), params: {
+        name: 'mylist'
+      }
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+      expect(list.reload.name).to eq('original_name')
+    end
+
+    it 'returns forbidden if the feature is unavailable' do
+      list = create_list(name: 'original_name')
+      stub_licensed_features(feature_flags: false)
+
+      put api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer), params: {
+        name: 'mylist', user_xids: '456,789'
+      }
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+
+    it 'updates the list' do
+      list = create_list(name: 'original_name', user_xids: '123')
+
+      put api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer), params: {
+        name: 'mylist', user_xids: '456,789'
+      }
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response.slice('name', 'user_xids')).to eq({
+        'name' => 'mylist',
+        'user_xids' => '456,789'
+      })
+      expect(list.reload.name).to eq('mylist')
+    end
+
+    it 'preserves attributes not listed in the request' do
+      list = create_list(name: 'original_name', user_xids: '123')
+
+      put api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer), params: {}
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response.slice('name', 'user_xids')).to eq({
+        'name' => 'original_name',
+        'user_xids' => '123'
+      })
+      expect(list.reload.name).to eq('original_name')
+      expect(list.reload.user_xids).to eq('123')
+    end
+
+    it 'returns an error when the update is invalid' do
+      create_list(name: 'taken', user_xids: '123')
+      list = create_list(name: 'original_name', user_xids: '123')
+
+      put api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer), params: {
+        name: 'taken'
+      }
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+      expect(json_response).to eq({ 'message' => ['Name has already been taken'] })
+    end
+
+    it 'returns not found when the list does not exist' do
+      list = create_list(name: 'original_name', user_xids: '123')
+
+      put api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid + 1}", developer), params: {
+        name: 'new_name'
+      }
+
+      expect(response).to have_gitlab_http_status(:not_found)
+      expect(json_response).to eq({ 'message' => '404 Not found' })
+    end
+  end
+
+  describe 'DELETE /projects/:id/feature_flags_user_lists/:iid' do
+    it 'forbids the request for a reporter' do
+      list = create_list
+
+      delete api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", reporter)
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+      expect(project.operations_feature_flags_user_lists.count).to eq(1)
+    end
+
+    it 'returns forbidden if the feature is unavailable' do
+      list = create_list
+      stub_licensed_features(feature_flags: false)
+
+      delete api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer)
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+
+    it 'returns not found when the list does not exist' do
+      delete api("/projects/#{project.id}/feature_flags_user_lists/1", developer)
+
+      expect(response).to have_gitlab_http_status(:not_found)
+      expect(json_response).to eq({ 'message' => '404 Not found' })
+    end
+
+    it 'deletes the list' do
+      list = create_list
+
+      delete api("/projects/#{project.id}/feature_flags_user_lists/#{list.iid}", developer)
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(project.operations_feature_flags_user_lists.count).to eq(0)
+    end
+  end
+end

spec/lib/gitlab/import_export/all_models.yml

@@ -443,6 +443,7 @@ project:
 - vulnerability_scanners
 - operations_feature_flags
 - operations_feature_flags_client
+- operations_feature_flags_user_lists
 - prometheus_alerts
 - prometheus_alert_events
 - self_managed_prometheus_alert_events