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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labels:
summary: 'Test account credentials using HTTP'
...

Introduction
------------

This module lets you test whether a set of credentials are valid,
using Prosody's configured authentication mechanism.

This is useful as an easy way to allow other (e.g. non-XMPP) applications
to authenticate users using their XMPP credentials.

Syntax
------

To test credentials, issue a simple GET request with HTTP basic auth:

    GET /auth_check HTTP/1.1
    Authorization: Basic <base64(jid:password)>

Prosody will return a 2xx code on success (user exists and credentials are
correct), or 401 if the credentials are invalid. Any other code may be returned
if there is a problem handling the request.

### Example usage

Here follows some example usage using `curl`.

    curl http://prosody.local:5280/auth_check -u user@example.com:secr1t