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annotate mod_cloud_notify/README.markdown @ 5580:feadbd481285

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mod_http_oauth2: Only add nonce when issuing a client_secret Not as important that the client_id be unique if there's no client_secret since the point was to make each issued client_secret distinct.
author Kim Alvefur <zash@zash.se>
date Mon, 26 Jun 2023 00:19:05 +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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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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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)