Add UploadValidationListener extension point example

Add DenyUploadExample to demonstrate an UploadValidationListener
implementation that block upload when trying to fetch project named
'deny-upload-project'.  Also demonstrate sending a message back to
the client for transports that support it (unsupported transports
will simply discard the message).

Change-Id: I4d76e6c893888cd47c4944af2ff8e77bacb5c790
2 files changed
tree: 13683c126ed025d71e4be09f8b78627ac37ac59d
  1. lib/
  2. src/
  3. .buckconfig
  4. .gitignore
  5. BUCK
  6. LICENSE
  7. pom.xml