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mod_cloud_notify/README.markdown @ 5680:80abda15a1e9
mod_muc_members_json: Fix potential error when removing old affiliations
Found this uncommitted change on a production server...
The affiliation data may been `nil` at some point, triggering an error?
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 19 Sep 2023 14:55:56 +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: 'XEP-0357: Cloud push notifications' |
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5 --- |
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6 |
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7 Introduction |
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8 ============ |
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9 |
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10 This module enables support for sending "push notifications" to clients that |
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11 need it, typically those running on certain mobile devices. |
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12 |
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13 As well as this module, your client must support push notifications (the apps |
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14 that need it generally do, of course) and the app developer's push gateway |
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15 must be reachable from your Prosody server (this happens over a normal XMPP |
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16 server-to-server 's2s' connection). |
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17 |
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18 Details |
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19 ======= |
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20 |
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21 Some platforms, notably Apple's iOS and many versions of Android, impose |
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22 limits that prevent applications from running or accessing the network in the |
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23 background. This makes it difficult or impossible for an XMPP application to |
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24 remain reliably connected to a server to receive messages. |
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25 |
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26 In order for messaging and other apps to receive notifications, the OS vendors |
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27 run proprietary servers that their OS maintains a permanent connection to in |
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28 the background. Then they provide APIs to application developers that allow |
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29 sending notifications to specific devices via those servers. |
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30 |
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31 When you connect to your server with an app that requires push notifications, |
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32 it will use this module to set up a "push registration". When you receive |
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33 a message but your device is not connected to the server, this module will |
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34 generate a notification and send it to the push gateway operated by your |
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35 application's developers). Their gateway will then connect to your device's |
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36 OS vendor and ask them to forward the notification to your device. When your |
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37 device receives the notification, it will display it or wake up the app so it |
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38 can connect to XMPP and receive any pending messages. |
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39 |
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40 This protocol is described for developers in [XEP-0357: Push Notifications]. |
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41 |
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42 For this module to work reliably, you must have [mod_smacks], [mod_mam] and |
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43 [mod_carbons] also enabled on your server. |
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44 |
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45 Some clients, notably Siskin and Snikket iOS need some additional extensions |
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46 that are not currently defined in a standard XEP. To support these clients, |
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47 see [mod_cloud_notify_extensions]. |
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48 |
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49 Configuration |
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50 ============= |
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51 |
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52 Option Default Description |
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53 ------------------------------------ ----------------- ------------------------------------------------------------------------------------------------------------------- |
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54 `push_notification_important_body` `New Message!` The body text to use when the stanza is important (see above), no message body is sent if this is empty |
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55 `push_max_errors` `16` How much persistent push errors are tolerated before notifications for the identifier in question are disabled |
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56 `push_max_devices` `5` The number of allowed devices per user (the oldest devices are automatically removed if this threshold is reached) |
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57 `push_max_hibernation_timeout` `259200` (72h) Number of seconds to extend the smacks timeout if no push was triggered yet (default: 72 hours) |
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58 `push_notification_with_body` (\*) `false` Whether or not to send the real message body to remote pubsub node. Without end-to-end encryption, enabling this may expose your message contents to your client developers and OS vendor. Not recommended. |
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59 `push_notification_with_sender` (\*) `false` Whether or not to send the real message sender to remote pubsub node. Enabling this may expose your contacts to your client developers and OS vendor. Not recommended. |
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60 |
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61 (\*) There are privacy implications for enabling these options. |
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62 |
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63 Internal design notes |
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64 ===================== |
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65 |
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66 App servers are notified about offline messages, messages stored by [mod_mam] |
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67 or messages waiting in the smacks queue. |
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68 The business rules outlined [here](//mail.jabber.org/pipermail/standards/2016-February/030925.html) are all honored[^2]. |
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69 |
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70 To cooperate with [mod_smacks] this module consumes some events: |
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71 `smacks-ack-delayed`, `smacks-hibernation-start` and `smacks-hibernation-end`. |
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72 These events allow this module to send out notifications for messages received |
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73 while the session is hibernated by [mod_smacks] or even when smacks |
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74 acknowledgements for messages are delayed by a certain amount of seconds |
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75 configurable with the [mod_smacks] setting `smacks_max_ack_delay`. |
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76 |
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77 The `smacks_max_ack_delay` setting allows to send out notifications to clients |
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78 which aren't already in smacks hibernation state (because the read timeout or |
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79 connection close didn't already happen) but also aren't responding to acknowledgement |
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80 request in a timely manner. This setting thus allows conversations to be smoother |
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81 under such circumstances. |
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82 |
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83 The new event `cloud-notify-ping` can be used by any module to send out a cloud |
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84 notification to either all registered endpoints for the given user or only the endpoints |
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85 given in the event data. |
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86 |
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87 The config setting `push_notification_important_body` can be used to specify an alternative |
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88 body text to send to the remote pubsub node if the stanza is encrypted or has a body. |
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89 This way the real contents of the message aren't revealed to the push appserver but it |
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90 can still see that the push is important. |
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91 This is used by Chatsecure on iOS to send out high priority pushes in those cases for example. |
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92 |
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93 Compatibility |
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94 ============= |
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95 |
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96 **Note:** This module should be used with Lua 5.2 and higher. Using it with |
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97 Lua 5.1 may cause push notifications to not be sent to some clients. |
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98 |
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99 ------ ----------------------------------------------------------------------------- |
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100 trunk Works |
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101 0.12 Works |
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102 0.11 Works |
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103 0.10 Works |
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104 0.9 Support dropped, use last supported version [675726ab06d3](//hg.prosody.im/prosody-modules/raw-file/675726ab06d3/mod_cloud_notify/mod_cloud_notify.lua) |
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105 ------ ----------------------------------------------------------------------------- |
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106 |
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107 |
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108 [^1]: The service which is expected to forward notifications to something like Google Cloud Messaging or Apple Notification Service |
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109 [^2]: [business_rules.markdown](//hg.prosody.im/prosody-modules/file/tip/mod_cloud_notify/business_rules.markdown) |