Add customizable user roles (#18641)

* Add customizable user roles

* Various fixes and improvements

* Add migration for old settings and fix tootctl role management

app/serializers/rest/credential_account_serializer.rb

@@ -3,6 +3,8 @@
 class REST::CredentialAccountSerializer < REST::AccountSerializer
   attributes :source
 
+  has_one :role, serializer: REST::RoleSerializer
+
   def source
     user = object.user
 
@@ -15,4 +17,8 @@ class REST::CredentialAccountSerializer < REST::AccountSerializer
       follow_requests_count: FollowRequest.where(target_account: object).limit(40).count,
     }
   end
+
+  def role
+    object.user_role
+  end
 end

app/serializers/rest/instance_serializer.rb

@@ -93,7 +93,7 @@ class REST::InstanceSerializer < ActiveModel::Serializer
   end
 
   def invites_enabled
-    Setting.min_invite_role == 'user'
+    UserRole.everyone.can?(:invite_users)
   end
 
   private

app/serializers/rest/role_serializer.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class REST::RoleSerializer < ActiveModel::Serializer
+  attributes :id, :name, :permissions, :color, :highlighted
+
+  def id
+    object.id.to_s
+  end
+
+  def permissions
+    object.computed_permissions.to_s
+  end
+end