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annotate mod_cloud_notify/README.markdown @ 4412:e5493a10c4d1

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mod_cloud_notify: use stanza from mod_smacks to behave O(1) This uses the provided stanza in the ack-delayed smacks event to trigger push for this stanza only rather than iterating through the whole smacks queue to find the first unpushed stanza.
author tmolitor <thilo@eightysoft.de>
date Sat, 30 Jan 2021 07:17:33 +0100
parents 7630d4ade7cd
children 487f1eb829cf
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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 is an implementation of the server bits of [XEP-0357: Push Notifications].
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11 It allows clients to register an "app server" which is notified about new
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12 messages while the user is offline, disconnected or the session is hibernated
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13 by [mod_smacks].
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14 Implementation of the "app server" is not included[^1].
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15
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16 **Please note: Multi client setups don't work properly if MAM is disabled and using this module won't change this at all!**
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17
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18 Details
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19 =======
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21 App servers are notified about offline messages, messages stored by [mod_mam]
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22 or messages waiting in the smacks queue.
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23 The business rules outlined [here](//mail.jabber.org/pipermail/standards/2016-February/030925.html) are all honored[^2].
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24
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25 To cooperate with [mod_smacks] this module consumes some events:
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26 `smacks-ack-delayed`, `smacks-hibernation-start` and `smacks-hibernation-end`.
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27 These events allow this module to send out notifications for messages received
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28 while the session is hibernated by [mod_smacks] or even when smacks
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29 acknowledgements for messages are delayed by a certain amount of seconds
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30 configurable with the [mod_smacks] setting `smacks_max_ack_delay`.
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31
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32 The `smacks_max_ack_delay` setting allows to send out notifications to clients
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33 which aren't already in smacks hibernation state (because the read timeout or
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34 connection close didn't already happen) but also aren't responding to acknowledgement
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35 request in a timely manner. This setting thus allows conversations to be smoother
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36 under such circumstances.
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37
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38 The new event `cloud-notify-ping` can be used by any module to send out a cloud
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39 notification to either all registered endpoints for the given user or only the endpoints
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40 given in the event data.
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41
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42 The config setting `push_notification_important_body` can be used to specify an alternative
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43 body text to send to the remote pubsub node if the stanza is encrypted or has a body.
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44 This way the real contents of the message aren't revealed to the push appserver but it
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45 can still see that the push is important.
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46 This is used by Chatsecure on iOS to send out high priority pushes in those cases for example.
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47
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48 Configuration
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49 =============
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50
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51 Option Default Description
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52 ------------------------------------ ----------------- -------------------------------------------------------------------------------------------------------------------
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53 `push_notification_with_body` `false` Whether or not to send the message body to remote pubsub node.
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54 `push_notification_with_sender` `false` Whether or not to send the message sender to remote pubsub node.
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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_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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57 `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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58
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59 There are privacy implications for enabling these options because
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60 plaintext content and metadata will be shared with centralized servers
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61 (the pubsub node) run by arbitrary app developers.
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62
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63 Installation
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64 ============
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65
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66 Same as any other module.
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68 Configuration
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69 =============
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71 Configured in-band by supporting clients.
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72
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73 Compatibility
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74 =============
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75
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76 ------ -----------------------------------------------------------------------------
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77 trunk Works
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78 0.11 Works
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79 0.10 Works
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80 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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81 ------ -----------------------------------------------------------------------------
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84 [^1]: The service which is expected to forward notifications to something like Google Cloud Messaging or Apple Notification Service
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85 [^2]: [business_rules.markdown](//hg.prosody.im/prosody-modules/file/tip/mod_cloud_notify/business_rules.markdown)