X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/747aa7b4d080b4ea95bf7d6d8643c43e70966f33..c1e7255a85dfc2807ba78e1cf9d109d896c80b42:/services/api/app/models/arvados_model.rb

diff --git a/services/api/app/models/arvados_model.rb b/services/api/app/models/arvados_model.rb
index adff09d53c..a6c9d31d41 100644
--- a/services/api/app/models/arvados_model.rb
+++ b/services/api/app/models/arvados_model.rb
@@ -27,7 +27,7 @@ class ArvadosModel < ActiveRecord::Base
   # Note: This only returns permission links. It does not account for
   # permissions obtained via user.is_admin or
   # user.uuid==object.owner_uuid.
-  has_many :permissions, :foreign_key => :head_uuid, :class_name => 'Link', :primary_key => :uuid, :conditions => "link_class = 'permission'", dependent: :destroy
+  has_many :permissions, :foreign_key => :head_uuid, :class_name => 'Link', :primary_key => :uuid, :conditions => "link_class = 'permission'"
 
   class PermissionDeniedError < StandardError
     def http_status
@@ -197,10 +197,21 @@ class ArvadosModel < ActiveRecord::Base
           current_user.can? write: self.owner_uuid
         # current_user is, or has :write permission on, the new owner
       else
-        logger.warn "User #{current_user.uuid} tried to modify #{self.class.to_s} #{self.uuid} but does not have permission to write #{self.owner_uuid_was}"
+        logger.warn "User #{current_user.uuid} tried to change owner_uuid of #{self.class.to_s} #{self.uuid} to #{self.owner_uuid} but does not have permission to write to #{self.owner_uuid}"
         raise PermissionDeniedError
       end
     end
+    if new_record?
+      return true
+    elsif current_user.uuid == self.owner_uuid_was or
+        current_user.uuid == self.uuid or
+        current_user.can? write: self.owner_uuid_was
+      # current user is, or has :write permission on, the previous owner
+      return true
+    else
+      logger.warn "User #{current_user.uuid} tried to modify #{self.class.to_s} #{self.uuid} but does not have permission to write #{self.owner_uuid_was}"
+      raise PermissionDeniedError
+    end
   end
 
   def ensure_permission_to_save