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mod_cloud_notify/README.markdown @ 3073:ef8fe8bec5b1
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| author | Kim Alvefur <zash@zash.se> |
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| date | Wed, 30 May 2018 09:28:38 +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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65 |
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66 Configuration |
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67 ============= |
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68 |
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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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75 |
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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 |
