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mod_vcard_muc: Add an alternative method of signaling avatar change When the avatar has been changed, a signal is sent that the room configuration has changed. Clients then do a disco#info query to find the SHA-1 of the new avatar. They can then fetch it as before, or not if they have it cached already. This is meant to be less disruptive than signaling via presence, which caused problems for some clients. If clients transition to the new method, the old one can eventually be removed. The namespace is made up while waiting for standardization. Otherwise it is very close to what's described in https://xmpp.org/extensions/inbox/muc-avatars.html
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 20:46:43 +0200
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 summary: Delegate roster management to an external service
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5 ...
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7 *NOTE: THIS MODULE IS RELEASED UNDER THE MOZILLA PUBLIC LICENSE VERSION 2.*
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8
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9 Normally the XMPP server will store and maintain the users' contact
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10 rosters. This module lets you delegate roster management to an external
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11 service.
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12
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13 Prosody will make an HTTP request to fetch the roster from the external
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14 service. The service will need to notify Prosody whenever a user's roster
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15 changes, so that Prosody can fetch a new roster for that user.
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17 ## Configuring this module
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19 This module relies on `mod_storage_memory` and `mod_block_subscriptions`.
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20
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21 In `.parts/prosody/etc/prosody/prosody.cfg.lua`, where your particular
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22 `VirtualHost` is being configured, add the following:
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23
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24 ``` lua
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25 modules_enabled = {
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26 "http_roster_admin",
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27 "block_subscriptions",
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28 "storage_memory",
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29 "http_files"
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30 }
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31 modules_disabled = {
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32 -- Prosody will get the roster from the backend app,
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33 -- so we disable the default roster module.
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34 "roster"
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35 }
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36 storage = { roster = "memory" }
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37 http_roster_url = "http://localhost/contacts/%s" -- %s will be replaced by an URL-encoded username
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38 ```
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39
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40 The `http_roster_url` parameter needs to be configured to point to the
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41 URL in the backend application which returns users' contacts rosters.
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42
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43 In this URL, the pattern `%s` is replaced by an URL-encoded username.
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44
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45 When the user *john* then connects to Prosody, and `http_roster_url` is
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46 set to “http://app.example.org/contacts/%s”, then Prosody will make a
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47 GET request to http://app.example.org/contacts/john
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48
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49 ## Protocol
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50
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51 ### Fetching rosters (Prosody to web app)
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52
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53 Prosody considers the web application to always hold the most accurate and up-to-date
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54 version of the user's roster. When a user first connects, Prosody fetches the roster
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55 from the web application and caches it internally.
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56
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57 Prosody will make a GET request to the URL specified in Prosody's configuration parameter
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58 'http_roster_url'. In this URL, the pattern '%s' is replaced by an URL-encoded username.
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59
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60 For example, when the user 'john' connects to Prosody, and http_roster_url is set
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61 to "http://app.example.com/contacts/%s", Prosody will make a GET request to "http://app.example.com/contacts/john".
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62
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63 The web app must return a JSON object, where each key is the JID of a contact, and the corresponding
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64 value is data about that contact.
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65
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66 If the user 'john' has friends 'marie' and 'michael', the web app would return a HTTP '200 OK' response
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67 with the following contents:
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68
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69 ``` json
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70 {
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71 "marie@example.com": {
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72 "name": "Marie"
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73 },
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74
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75 "michael@example.com": {
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76 "name": "Michael"
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77 }
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78 }
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79 ```
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80
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81 ### Notifying Prosody of roster changes
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82
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83 The external service needs to notify Prosody whenever a user's roster
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84 changes. To do this, it must make an HTTP POST request to either:
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85
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86 - http://localhost:5280/roster_admin/refresh
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87 - https://localhost:5281/roster_admin/refresh
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88
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89 Make sure that the "http_files" module is enabled in Prosody's configuration,
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90 for the above URLs to served.
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91
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92 Ports 5280/5281 can be firewalled and the web server (i.e. Apache or Nginx)
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93 can be configured to reverse proxy those URLs to for example
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94 https://example.org/http-bind.
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95
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96 The contents of the POST should be a JSON encoded array of usernames whose
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97 rosters have changed.
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98
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99 For example, if user ‘john’ became friends with ‘aaron’, both john’s
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100 contact list and aaron’s contact lists have changed:
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101
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102 ``` json
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103 ["john", "aaron"]
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104 ```
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105
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106 When the operation is complete Prosody will reply with a summary of the
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107 operation - a JSON object containing:
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108
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109 - **status**: either “ok” (success) or “error” (operation completely failed)
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110 - **message**: A human-readable message (for logging and debugging purposes)
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111 - **updated**: The number of rosters successfully updated
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112 - **errors**: The number of rosters that failed to update
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113
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114 Example:
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115
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116 ``` json
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117 {
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118 "status": "ok",
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119 "message": "roster update complete",
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120 "updated": 2,
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121 "errors": 0
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122 }
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123 ```
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124
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125 Prosody may also return status codes `400` or `500` in case of errors (such
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126 as a missing/malformed body).