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annotate mod_http_roster_admin/README.markdown @ 4569:9cbdb60e21f2
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author | Kim Alvefur <zash@zash.se> |
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date | Mon, 24 May 2021 16:36:35 +0200 |
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2 labels: | |
3 - 'Stage-Beta' | |
4 summary: Delegate roster management to an external service | |
5 ... | |
2161 | 6 |
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7 *NOTE: THIS MODULE IS RELEASED UNDER THE MOZILLA PUBLIC LICENSE VERSION 2.* |
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9 Normally the XMPP server will store and maintain the users' contact | |
10 rosters. This module lets you delegate roster management to an external | |
11 service. | |
12 | |
13 Prosody will make an HTTP request to fetch the roster from the external | |
14 service. The service will need to notify Prosody whenever a user's roster | |
15 changes, so that Prosody can fetch a new roster for that user. | |
16 | |
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17 ## Configuring this module |
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19 This module relies on `mod_storage_memory` and `mod_block_subscriptions`. | |
20 | |
21 In `.parts/prosody/etc/prosody/prosody.cfg.lua`, where your particular | |
22 `VirtualHost` is being configured, add the following: | |
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 ``` |
2161 | 39 |
40 The `http_roster_url` parameter needs to be configured to point to the | |
41 URL in the backend application which returns users' contacts rosters. | |
42 | |
43 In this URL, the pattern `%s` is replaced by an URL-encoded username. | |
44 | |
45 When the user *john* then connects to Prosody, and `http_roster_url` is | |
46 set to “http://app.example.org/contacts/%s”, then Prosody will make a | |
47 GET request to http://app.example.org/contacts/john | |
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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83 The external service needs to notify Prosody whenever a user's roster | |
84 changes. To do this, it must make an HTTP POST request to either: | |
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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89 Make sure that the "http_files" module is enabled in Prosody's configuration, | |
90 for the above URLs to served. | |
91 | |
92 Ports 5280/5281 can be firewalled and the web server (i.e. Apache or Nginx) | |
93 can be configured to reverse proxy those URLs to for example | |
94 https://example.org/http-bind. | |
95 | |
96 The contents of the POST should be a JSON encoded array of usernames whose | |
97 rosters have changed. | |
98 | |
99 For example, if user ‘john’ became friends with ‘aaron’, both john’s | |
100 contact list and aaron’s contact lists have changed: | |
101 | |
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102 ``` json |
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103 ["john", "aaron"] |
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104 ``` |
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106 When the operation is complete Prosody will reply with a summary of the | |
107 operation - a JSON object containing: | |
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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114 Example: | |
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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125 Prosody may also return status codes `400` or `500` in case of errors (such | |
126 as a missing/malformed body). |