File

mod_muc_hats_api/README.markdown @ 5185:09d6bbd6c8a4

mod_http_oauth2: Fix treatment of 'redirect_uri' parameter in code flow It's optional and the one stored in the client registration should really be used instead. RFC 6749 says an URI provided as parameter MUST be validated against the stored one but does not say how. Given that the client needs their secret to proceed, it seems fine to leave this for later.
author Kim Alvefur <zash@zash.se>
date Thu, 02 Mar 2023 22:00:42 +0100
parent 3950:e9e41e75c5a0
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---
summary: API for managing MUC hats
---

# Introduction

This module provides an internal API (i.e. to other modules) to manage
'hats' for users in MUC rooms.

Hats (first defined in [XEP-0317], currently deferred) are additional identifiers
that can be attached to users in a group chat. For example in an educational
context, you may have a 'Teacher' hat that allows students to identify their
teachers.

Hats consist of a machine-readable unique identifier (a URI), and optionally
a human-readable label.

[XEP-0317] suggests a protocol for users to manage their own hats, but though the
API in this module allows for both user-managed and system-managed hats, there is
currently no protocol implemented for users to manage their own hats, which is
rarely desired in real-world implementations.

The rest of this documentation is designed for developers who use this module.

## Data model

### User

```
{
  "hats": {
    "urn:uuid:164c41a2-7461-4cff-bdae-3f93078a6607": {
      "active": false
    },
    "http://example.com/hats/foo": {
      "active": true,
      "required": true,
      "title": "Awesome"
    }
}
```

| Field | Type   | Description                                                  |
|-------|--------|--------------------------------------------------------------|
| hats  | object | An object where mapping hat ids (key) to attachments (value) |

Hat IDs must be a URI that uniquely identifies the hat.

### Attachment

```
{
  "active": true,
  "required": true,
  "title": "My Awesome Hat"
}
```

| Field    | Type    | Description                                                 |
|----------|---------|-------------------------------------------------------------|
| active   | boolean | If true, indicates the user is currently displaying the hat |
| required | boolean | If true, indicates the user is not able to remove the hat   |
| title    | string  | A human-readable display name or label for the hat          |

All fields are optional, omitted boolean values are equivalent to false.

## API

All methods return 'nil, err' on failure as standard throughout the Prosody codebase.

Example of using this module from another module:

```
local muc_hats = module:depends("muc_hats_api");

muc_hats.add_user_hat("user@localhost", "room@conference.localhost", "urn:uuid:164c41a2-7461-4cff-bdae-3f93078a6607", { active = true });
```

Note that the module only works when loaded on a MUC host, which generally means any
module that uses it must also be loaded on the MUC host that it is managing.

### add_user_hat

`add_user_hat(user_jid, room_jid, hat_id, attachment)`

Adds the identified hat to a user's... wardrobe? The user must already
have an affiliation with the room (i.e. member, admin or owner).

If `attachment` is omitted, it defaults to `{}`.

#### Error cases

item-not-found
: Supplied room JID was not found on the current host

item-not-found
: Supplied user JID was not affiliated with the room

### remove_user_hat

`remove_user_hat(user_jid, room_jid, hat_id)`

If the identified hat is currently available to the user, it is removed.

#### Error cases

item-not-found
: Supplied room JID was not found on the current host

item-not-found
: Supplied user JID was not affiliated with the room

### set_user_hats

`set_user_hats(user_jid, room_jid, hats)`

Ensures the listed hats are the hats available to a user, automatically
adding/removing as necessary.

The `hats` parameter should be an object mapping hat ids (keys) to attachment
objects (values).

#### Error cases

item-not-found
: Supplied room JID was not found on the current host

item-not-found
: Supplied user JID was not affiliated with the room