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mod_isolate_host: Pass context to module:may() (thanks cc)
author Matthew Wild <mwild1@gmail.com>
date Tue, 29 Nov 2022 11:36:28 +0000
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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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6
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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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16
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17 ## Configuring this module
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18
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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).