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mod_rest: Catch and log errors in callback promise chain From the code it looks like it should be possible to reply to an error stanza, but it did not. Turns out I was saved by my local developer mode module which throws errors if an attempt is made to create an errror reply to an error stanza. However nothing collects this error from the promise, so all I got was confusion.
author Kim Alvefur <zash@zash.se>
date Sun, 15 Nov 2020 16:25:49 +0100
parents 0e1e775bdea0
children
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---
labels:
- 'Stage-Alpha'
summary: 'Experimental module to add metadata to media in MUCs'
...

# Introduction

This module adds additional metadata to media shared in a MUC. This can help clients
make decisions and provide better UI and enhanced privacy, by knowing things like file
size without needing to make external network requests.

::: {.alert .alert-danger}
**NOTE:** This is an experimental module. It is not supported by any
clients, and therefore is mainly of interest to client developers who
wish to explore the idea.
:::

# Configuring

## Enabling

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

## Settings

There are no configuration options for this module.

# Developers

## Example stanzas

A normal message in a chatroom containing an image:

```
<message from="test@rooms.example.com/matthew" id="9f45a784-5e5b-4db5-a9b3-8ea1d7c1162d" type="groupchat">
  <body>https://matthewwild.co.uk/share.php/70334772-ff74-439b-8173-a71e40ca28db/mam-flow.png</body>
  <x xmlns="jabber:x:oob">
    <url>https://matthewwild.co.uk/share.php/70334772-ff74-439b-8173-a71e40ca28db/mam-flow.png</url>
  </x>
</message>
```

The same stanza with this module loaded now contains additional metadata added by the server:

```
<message from="test@rooms.example.com/matthew" id="9f45a784-5e5b-4db5-a9b3-8ea1d7c1162d" type="groupchat">
  <body>https://matthewwild.co.uk/share.php/70334772-ff74-439b-8173-a71e40ca28db/mam-flow.png</body>
  <x xmlns="jabber:x:oob">
    <url>https://matthewwild.co.uk/share.php/70334772-ff74-439b-8173-a71e40ca28db/mam-flow.png</url>
    <metadata xmlns="xmpp:prosody.im/protocol/media-metadata#0">
      <bytes>15690</bytes>
      <type>image/png</type>
      <blurhash>LEHV6nWB2yk8pyo0adR*.7kCMdnj</blurhash>
    </metadata>
  </x>
</message>
```