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annotate mod_cloud_notify/README.markdown @ 3056:6fce9a935b38

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author tmolitor <thilo@eightysoft.de>
date Mon, 28 May 2018 18:53:43 +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 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 Details
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17 =======
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18
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19 App servers are notified about offline messages, messages stored by [mod_mam]
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20 or messages waiting in the smacks queue.
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21 The business rules outlined [here] are all honored[^2].
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22
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23 To cooperate with [mod_smacks] this module consumes some events:
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24 `smacks-ack-delayed`, `smacks-hibernation-start` and `smacks-hibernation-end`.
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25 These events allow this module to send out notifications for messages received
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26 while the session is hibernated by [mod_smacks] or even when smacks
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27 acknowledgements for messages are delayed by a certain amount of seconds
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28 configurable with the [mod_smacks] setting `smacks_max_ack_delay`.
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29
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30 The `smacks_max_ack_delay` setting allows to send out notifications to clients
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31 which aren't already in smacks hibernation state (because the read timeout or
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32 connection close didn't already happen) but also aren't responding to acknowledgement
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33 request in a timely manner. This setting thus allows conversations to be smoother
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34 under such circumstances.
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35
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36 The new event `cloud-notify-ping` can be used by any module to send out a cloud
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37 notification to either all registered endpoints for the given user or only the endpoints
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38 given in the event data.
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39
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40 The config setting `push_notification_important_body` can be used to specify an alternative
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41 body text to send to the remote pubsub node if the stanza is encrypted or has a body.
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42 This way the real contents of the message aren't revealed to the push appserver but it
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43 can still see that the push is important.
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44 This is used by Chatsecure on iOS to send out high priority pushes in those cases for example.
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45
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46 Configuration
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47 =============
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48
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49 Option Default Description
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50 ------------------------------------ ----------------- -------------------------------------------------------------------------------------------------------------------
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51 `push_notification_with_body` `false` Whether or not to send the message body to remote pubsub node.
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52 `push_notification_with_sender` `false` Whether or not to send the message sender to remote pubsub node.
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53 `push_max_errors` `16` How much persistent push errors are tolerated before notifications for the identifier in question are disabled
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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_devices` `5` The number of allowed devices per user (the oldest devices are automatically removed if this threshold is reached)
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56
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57 There are privacy implications for enabling these options because
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58 plaintext content and metadata will be shared with centralized servers
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59 (the pubsub node) run by arbitrary app developers.
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60
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61 Installation
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62 ============
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63
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64 Same as any other module.
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66 Configuration
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67 =============
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69 Configured in-band by supporting clients.
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70
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71 Compatibility
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72 =============
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73
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74 Should work with 0.9+.
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76 [^1]: The service which is expected to forward notifications to
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77 something like Google Cloud Messaging or Apple Notification Service
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78 [here]: https://mail.jabber.org/pipermail/standards/2016-February/030925.html
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79 [^2]: //hg.prosody.im/prosody-modules/file/tip/mod_cloud_notify/business_rules.markdown