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mod_http_oauth2: Implement stateless dynamic client registration Replaces previous explicit registration that required either the additional module mod_adhoc_oauth2_client or manually editing the database. That method was enough to have something to test with, but would not probably not scale easily. Dynamic client registration allows creating clients on the fly, which may be even easier in theory. In order to not allow basically unauthenticated writes to the database, we implement a stateless model here. per_host_key := HMAC(config -> oauth2_registration_key, hostname) client_id := JWT { client metadata } signed with per_host_key client_secret := HMAC(per_host_key, client_id) This should ensure everything we need to know is part of the client_id, allowing redirects etc to be validated, and the client_secret can be validated with only the client_id and the per_host_key. A nonce injected into the client_id JWT should ensure nobody can submit the same client metadata and retrieve the same client_secret

# Introduction

Many projects have a support room accessible via a web chat. This module
allows making the URL to such a web chat discoverable via the XMPP
service discovery protocol, enabling e.g. [search
engines](https://search.jabbercat.org/) to index and present these.

# Configuring

## Enabling

``` {.lua}
Component "rooms.example.net" "muc"
modules_enabled = {
    "muc_webchat_url";
}
```

## Settings

The URL is configured using the in-band MUC room configuration protocol.

The module can optionally be configured to give all public (not
members-only, hidden or password protected) rooms gain a default value
based on a template:

``` {.lua}
muc_webchat_baseurl = "https://chat.example.com/join?room={node}"
```

The following variables will be subsituted with room address details:

`{jid}`
:   The complete room address, eg `room@muc.example.com`·

`{node}`
:   The local part (before the `@`) of the room JID.

`{host}`
:   The domain name part of the room JID.