Backport permissions and multi-line array to CE

app/policies/global_policy.rb

@@ -10,6 +10,7 @@ class GlobalPolicy < BasePolicy
       can! :access_api
       can! :access_git
       can! :receive_notifications
+      can! :use_slash_commands
     end
   end
 end

app/services/slash_commands/interpret_service.rb

@@ -7,6 +7,8 @@ module SlashCommands
     # Takes a text and interprets the commands that are extracted from it.
     # Returns the content without commands, and hash of changes to be applied to a record.
     def execute(content, issuable)
+      return [content, {}] unless current_user.can?(:use_slash_commands)
+
       @issuable = issuable
       @updates = {}

lib/gitlab/email/handler.rb

@@ -5,7 +5,11 @@ require 'gitlab/email/handler/unsubscribe_handler'
 module Gitlab
   module Email
     module Handler
-      HANDLERS = [UnsubscribeHandler, CreateNoteHandler, CreateIssueHandler].freeze
+      HANDLERS = [
+        UnsubscribeHandler,
+        CreateNoteHandler,
+        CreateIssueHandler
+      ].freeze
       def self.for(mail, mail_key)
         HANDLERS.find do |klass|