Add a hook to allow modules to respond to validation failures

Problem/Motivation

We are adding multiple layers of anti spam measures to our project. Whenever a layer fails validation, we would like to log an event in the flood table to eventually automatically block users when they go over a certain threshold. A hook seems the most flexible, the honeypot module has hook_honeypot_reject() for this. Maybe we could add something similar.

Proposed resolution

It would be great if the antibot module would add hook_antibot_reject() to respond to validation failures for antibot. In our case we would log to the flood table, but maybe other modules want a different way of handling this.

Remaining tasks

• Write a patch
• Review
• Commit

User interface changes

None

API changes

A new hook hook_antibot_reject() will be added.