X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/1cf15bae4e5236084c338fb557c749533adce679..5a3b04f7177afe202ab4f8776b5ca2567b4fdabe:/services/api/app/controllers/arvados/v1/links_controller.rb

diff --git a/services/api/app/controllers/arvados/v1/links_controller.rb b/services/api/app/controllers/arvados/v1/links_controller.rb
index f76af60bb9..798217dc0c 100644
--- a/services/api/app/controllers/arvados/v1/links_controller.rb
+++ b/services/api/app/controllers/arvados/v1/links_controller.rb
@@ -34,16 +34,26 @@ class Arvados::V1::LinksController < ApplicationController
 
   protected
 
-  # Override find_object_by_uuid: the get_permissions method may be
-  # called on a uuid belonging to any class.
   def find_object_by_uuid
     if action_name == 'get_permissions'
+      # get_permissions accepts a UUID for any kind of object.
       @object = ArvadosModel::resource_class_for_uuid(params[:uuid])
         .readable_by(*@read_users)
         .where(uuid: params[:uuid])
         .first
     else
       super
+      if @object.nil?
+        # Normally group permission links are not readable_by users.
+        # Make an exception for users with permission to manage the group.
+        # FIXME: Solve this more generally - see the controller tests.
+        link = Link.find_by_uuid(params[:uuid])
+        if (not link.nil?) and
+            (link.link_class == "permission") and
+            (@read_users.any? { |u| u.can?(manage: link.head_uuid) })
+          @object = link
+        end
+      end
     end
   end