move draft state under feature flag umbrella

fixes CNVS-9496

test plan:
 - draft state feature should show up in site admin feature
   flags, or root account feature flags when called as site
   admin
 - when site admin hits "allow" for the feature, it should
   appear in the root account administrator's settings
   in "Off" state
 - the root account admin should be able to "Allow" the setting
   which allows a sub-account or course to turn it on
 - when the feature is turned on via the Feature Settings tab
   or features API, draft state functionality should appear
   in the course wiki pages and elsewhere

Change-Id: Id7403f2a8371b0a7bfebffbb8f29330fff5c94c5
Reviewed-on: https://gerrit.instructure.com/26308
Reviewed-by: Bracken Mosbacker <bracken@instructure.com>
Product-Review: Bracken Mosbacker <bracken@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Nathan Rogowski <nathan@instructure.com>

Author: jstanley0

app/controllers/application_controller.rb

@@ -1014,7 +1014,7 @@ def get_wiki_page
     @wiki.check_has_front_page
 
     page_name = params[:wiki_page_id] || params[:id] || (params[:wiki_page] && params[:wiki_page][:title])
-    page_name ||= (@wiki.get_front_page_url || Wiki::DEFAULT_FRONT_PAGE_URL) unless @context.draft_state_enabled?
+    page_name ||= (@wiki.get_front_page_url || Wiki::DEFAULT_FRONT_PAGE_URL) unless @context.feature_enabled?(:draft_state)
     if(params[:format] && !['json', 'html'].include?(params[:format]))
       page_name += ".#{params[:format]}"
       params[:format] = 'html'

app/controllers/assignments_api_controller.rb

@@ -324,7 +324,7 @@ def index
       fake = @context.assignments.new
       fake.workflow_state = 'unpublished'
 
-      if @context.draft_state_enabled? && !fake.grants_right?(@current_user, session, :read)
+      if @context.feature_enabled?(:draft_state) && !fake.grants_right?(@current_user, session, :read)
         # user should not see unpublished assignments
         @assignments = @assignments.published
       end
@@ -372,7 +372,7 @@ def show
       @assignment = @context.active_assignments.find(params[:id],
           :include => [:assignment_group, :rubric_association, :rubric])
 
-      if @context.draft_state_enabled? && !@assignment.grants_right?(@current_user, session, :read)
+      if @context.feature_enabled?(:draft_state) && !@assignment.grants_right?(@current_user, session, :read)
         # user should not see unpublished assignments
         render_unauthorized_action
         return
@@ -517,7 +517,7 @@ def show
   # @returns Assignment
   def create
     @assignment = @context.assignments.build
-    @assignment.workflow_state = 'unpublished' if @context.draft_state_enabled?
+    @assignment.workflow_state = 'unpublished' if @context.feature_enabled?(:draft_state)
 
     if authorized_action(@assignment, @current_user, :create)
       save_and_render_response

app/controllers/assignments_controller.rb

@@ -32,7 +32,7 @@ class AssignmentsController < ApplicationController
   before_filter :normalize_title_param, :only => [:new, :edit]
 
   def index
-    return old_index if @context == @current_user || !@context.draft_state_enabled?
+    return old_index if @context == @current_user || !@context.feature_enabled?(:draft_state)
 
     if authorized_action(@context, @current_user, :read)
       return unless tab_enabled?(@context.class::TAB_ASSIGNMENTS)
@@ -109,7 +109,7 @@ def show
       @assignment.ensure_assignment_group
       js_env({
         :ROOT_OUTCOME_GROUP => outcome_group_json(@context.root_outcome_group, @current_user, session),
-        :DRAFT_STATE => @context.draft_state_enabled?,
+        :DRAFT_STATE => @context.feature_enabled?(:draft_state),
         :COURSE_ID => @context.id,
         :ASSIGNMENT_ID => @assignment.id
       })
@@ -325,7 +325,7 @@ def create
 
   def new
     @assignment ||= @context.assignments.new
-    @assignment.workflow_state = 'unpublished' if @context.draft_state_enabled?
+    @assignment.workflow_state = 'unpublished' if @context.feature_enabled?(:draft_state)
     add_crumb t :create_new_crumb, "Create new"
 
     if params[:submission_types] == 'online_quiz'

app/controllers/context_module_items_api_controller.rb

@@ -291,7 +291,7 @@ def create
       item_params[:url] = params[:module_item][:external_url]
 
       if (@tag = @module.add_item(item_params)) && set_position && set_completion_requirement
-        if @context.draft_state_enabled?
+        if @context.feature_enabled?(:draft_state)
           @tag.workflow_state = 'unpublished'
           @tag.save
         end

app/controllers/context_modules_api_controller.rb

@@ -269,7 +269,7 @@ def create
       if ids = params[:module][:prerequisite_module_ids]
         @module.prerequisites = ids.map{|id| "module_#{id}"}.join(',')
       end
-      if @context.draft_state_enabled?
+      if @context.feature_enabled?(:draft_state)
         @module.workflow_state = 'unpublished'
       else
         @module.workflow_state = 'active'

app/controllers/context_modules_controller.rb

@@ -87,7 +87,7 @@ def reevaluate_modules_if_locked(tag)
   def create
     if authorized_action(@context.context_modules.new, @current_user, :create)
       @module = @context.context_modules.build
-      if @context.draft_state_enabled?
+      if @context.feature_enabled?(:draft_state)
         @module.workflow_state = 'unpublished'
       else
         @module.workflow_state = 'active'
@@ -375,7 +375,7 @@ def progressions
           @progressions = @context.context_modules.active.map{|m| m.evaluate_for(@current_user, true) }
           render :json => @progressions
         end
-      elsif !@context.draft_state_enabled?
+      elsif !@context.feature_enabled?(:draft_state)
         redirect_to named_context_url(@context, :context_context_modules_url, :anchor => "student_progressions")
       elsif !@context.grants_right?(@current_user, session, :manage_students)
         @restrict_student_list = true

app/controllers/courses_controller.rb

@@ -1112,7 +1112,7 @@ def show
 
 
     @context = Course.active.find(params[:id])
-    js_env :DRAFT_STATE => @context.draft_state_enabled?
+    js_env :DRAFT_STATE => @context.feature_enabled?(:draft_state)
     if request.xhr?
       if authorized_action(@context, @current_user, [:read, :read_as_admin])
         render :json => @context
@@ -1161,7 +1161,7 @@ def show
       when "wiki"
         @wiki = @context.wiki
         @page = @wiki.front_page
-        if @context.draft_state_enabled?
+        if @context.feature_enabled?(:draft_state)
           set_js_rights [:wiki, :page]
           set_js_wiki_data :course_home => true
           @padless = true

app/controllers/discussion_topics_controller.rb

@@ -228,7 +228,7 @@ def index
                     create: @context.discussion_topics.new.grants_right?(@current_user, session, :create),
                     moderate: user_can_moderate,
                     change_settings: user_can_edit_course_settings?,
-                    publish: user_can_moderate && @domain_root_account.enable_draft?
+                    publish: user_can_moderate && @domain_root_account.feature_enabled?(:draft_state)
                 }}
         append_sis_data(hash)
 

app/controllers/gradebook2_controller.rb

@@ -26,7 +26,7 @@ def show
         :course_is_concluded => @context.completed?,
         :gradebook_is_editable => @gradebook_is_editable,
         :speed_grader_enabled => @context.allows_speed_grader?,
-        :draft_state_enabled => @context.draft_state_enabled?
+        :draft_state_enabled => @context.feature_enabled?(:draft_state)
       }
     end
   end

app/controllers/gradebooks_controller.rb

@@ -182,7 +182,7 @@ def show
             newest = Time.parse("Jan 1 2010")
             @just_assignments = @just_assignments.sort_by{|a| [a.due_at || newest, @groups_order[a.assignment_group_id] || 0, a.position || 0] }
             @assignments = @just_assignments.dup + groups_as_assignments(@groups)
-            if @context.draft_state_enabled?
+            if @context.feature_enabled?(:draft_state)
               @assignments = @assignments.select(&:published?)
             end
             @submissions = @context.submissions
@@ -374,7 +374,7 @@ def speed_grader
     return unless authorized_action(@context, @current_user, [:manage_grades, :view_all_grades])
 
     @assignment = @context.assignments.active.find(params[:assignment_id])
-    if @context.draft_state_enabled? && @assignment.unpublished?
+    if @context.feature_enabled?(:draft_state) && @assignment.unpublished?
       flash[:notice] = t(:speedgrader_enabled_only_for_published_content,
                          'Speedgrader is enabled only for published content.')
       return redirect_to polymorphic_url([@context, @assignment])