Enable tags on a per project basis.

app/controllers/additional_tags_controller.rb

@@ -5,6 +5,8 @@ class AdditionalTagsController < ApplicationController
   before_action :find_tag, only: %i[edit update]
   before_action :bulk_find_tags, only: %i[context_menu merge destroy]
   before_action :set_tag_list_path
+  before_action :find_project_by_project_id, if: -> { params[:project_id] }
+  before_action :authorize, if: -> { @project.present? }
 
   helper :additional_tags_issues
   include AdditionalTagsHelper
@@ -13,6 +15,7 @@ class AdditionalTagsController < ApplicationController
 
   # used by api calls
   def index
+    raise 'tags are not enabled for project' unless allow_tags?
     raise 'type is not provided' if params[:type].blank?
 
     type_info = manageable_tag_columns.detect { |m| m.first.to_s == params[:type] }
@@ -101,4 +104,8 @@ def find_tag
   rescue ActiveRecord::RecordNotFound
     render_404
   end
-end
+
+  def allow_tags?
+    @project.nil? || @project.module_enabled?(:additional_tags)
+  end
+end

app/helpers/additional_tags_issues_helper.rb

@@ -7,7 +7,8 @@ def render_api_custom_values(custom_values, api)
 
     if @issue.present? &&
        (defined?(controller_name) && controller_name == 'issues' && action_name == 'show' || !defined?(controller_name)) &&
-       AdditionalTags.setting?(:active_issue_tags) && User.current.allowed_to?(:view_issue_tags, @project)
+       AdditionalTags.setting?(:active_issue_tags) && User.current.allowed_to?(:view_issue_tags, @project) &&
+       project.module_enabled?(:additional_tags)
 
       api.array :tags do
         # support tags, which are not saved to database

app/views/issues/_tags.html.slim

@@ -1,4 +1,4 @@
-- if AdditionalTags.setting?(:active_issue_tags) && User.current.allowed_to?(:view_issue_tags, issue.project)
+- if AdditionalTags.setting?(:active_issue_tags) && User.current.allowed_to?(:view_issue_tags, issue.project) && @project && project.module_enabled?(:additional_tags)
   = render 'additional_tags/tag_list',
            entry: issue,
            show_always: true,

app/views/projects/settings/_additional_tags.html.erb

@@ -0,0 +1,4 @@
+<p>
+  <%= check_box_tag 'settings[additional_tags_enabled]', 1, @project.additional_tags_enabled? %>
+  <%= label_tag 'settings[additional_tags_enabled]', l(:label_additional_tags_enabled) %>
+</p>

config/locales/en.yml

@@ -43,3 +43,4 @@ en:
   tags_sidebar_simple_cloud: "Simple cloud"
   tags_sort_by_count: "Count"
   tags_sort_by_name: "Name"
+  label_additional_tags_enabled: "Enable Additional Tags"

db/migrate/20260604000000_add_additional_tags_enabled_to_projects.rb

@@ -0,0 +1,5 @@
+class AddAdditionalTagsEnabledToProjects < ActiveRecord::Migration[6.0]
+  def change
+    add_column :projects, :additional_tags_enabled, :boolean, default: true, null: false
+  end
+end

init.rb

@@ -20,6 +20,11 @@
     permission :view_issue_tags, {}, read: true
   end
 
+  project_module :additional_tags do
+    permission :view_project_tags, { tags: %i[index, show] }
+    permission :manage_project_tags, { tags: %i[new, create, edit, destroy] }
+  end
+
   project_module :wiki do
     permission :add_wiki_tags, wiki: %i[update_tags]
   end