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| author | Kim Alvefur <zash@zash.se> |
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| date | Wed, 15 Jan 2020 21:38:03 +0100 |
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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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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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20 |
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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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67 |
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68 Configuration |
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69 ============= |
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70 |
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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 Should work with 0.9+. |
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77 |
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78 [^1]: The service which is expected to forward notifications to something like Google Cloud Messaging or Apple Notification Service |
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79 [^2]: [business_rules.markdown](//hg.prosody.im/prosody-modules/file/tip/mod_cloud_notify/business_rules.markdown) |
