mod_auth_cyrus: Add empty 'profile' table to SASL handler objects This is for compatibility with Prosody's built-in util.sasl objects. A SASL profile table usually includes methods supported by the backend, which can be used by SASL mechanism handlers to perform operations (such as testing the password). It also optionally contains a 'cb' field with channel binding method handlers. The Cyrus backend doesn't support channel binding, and doesn't have the same concept of auth backend methods (it handles all that internally, and Prosody has no insight or control over it). Thus, we create an empty profile which informs Prosody that the SASL handler does not support any of the auth or channel binding methods. Some features will not work, but they didn't work anyway. This just makes it explicit. This fixes a traceback in mod_sasl2_fast, which expected SASL handlers to always contain a 'profile' field.

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summary: HTTP Authentication using custom JSON protocol
...

Introduction
============

To authenticate users, this module does a `POST` request to a configured
URL with a JSON payload. It is not async so requests block the server
until answered.

Configuration
=============

``` lua
VirtualHost "example.com"
authentication = "custom_http"
auth_custom_http = {
  post_url = "http://api.example.com/auth";
}
```

Protocol
========

The JSON payload consists of an object with `username` and `password`
members:

    {"username":"john","password":"secr1t"}

The module expects the response body to be exactly `true` if the
username and password are correct.