annotate mod_web_push/README.markdown @ 3619:74aa35aeb08a

mod_cloud_notify: only push once on csi queue flush in hibernated state, unhook response handlers
author tmolitor <thilo@eightysoft.de>
date Sat, 15 Jun 2019 01:26:15 +0200
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children
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 summary: 'XEP-XXXX: Web Push'
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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 ::: {.alert .alert-danger}
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11 **This module is terribly untested and will only work with Firefox as it's
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12 missing payload encryption. Other vendors require it all the time. Public and
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13 private keys are also statically set in it.**
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14 :::
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15
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16 This is an implementation of the server bits of [XEP-XXXX: Web Push].
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17
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18 It allows web clients to register a "push server" which is notified about new
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19 messages while the user is offline, disconnected or the session is hibernated
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20 by [mod_smacks].
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21
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22 Push servers are provided by browser vendors.
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23
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24 This module is heavily based on [mod_cloud_notify].
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25
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26 Details
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27 =======
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28
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29 [Push API](https://w3c.github.io/push-api/) is a specification by the W3C that
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30 is essentially the same principle as Mobile OS vendors' Push notification
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31 systems. It is implemented by most browsers vendors except Safari on iOS
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32 (mobile).
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33
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34 For more information, see:
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35
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36 - https://developer.mozilla.org/en-US/docs/Web/API/Push_API
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37 - https://developers.google.com/web/ilt/pwa/introduction-to-push-notifications
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38
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39 Compared to [XEP-0357: Push Notifications], Web Push doesn't need an App
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40 Server.
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41
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42 The general flow for subscription is:
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43
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44 - XMPP server generate ECDH keypair, publishes public key
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45 - XMPP client generates an ECDH keypair
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46 - XMPP client fetches server public key
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47 - XMPP client subscribes to browser Push server using the Web Push API, and
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48 gets back an HTTP endpoint
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49 - XMPP client enables Push notifications telling the server the HTTP endpoint,
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50 and its public key
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51
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52 The flow for notifications is as follow:
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53
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54 - XMPP server receives an _important_[^1] message
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55 - XMPP server generates something something JWT + signature with ECDH key
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56 - XMPP server can optionally include payload encrypted for the client
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57 - XMPP server initiates HTTP POST request to the Push server
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58 - Push server sends notification to web browser
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59
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60 Configuration
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61 =============
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62
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63 Option Default Description
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64 ------------------------------------ ----------------- -------------------------------------------------------------------------------------------------------------------
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65 `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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66 `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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67
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68 There are privacy implications for enabling these options because
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69 plaintext content and metadata will be shared with centralized servers
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70 (the pubsub node) run by arbitrary app developers.
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71
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72 Installation
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73 ============
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74
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75 Same as any other module.
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76
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77 Configuration
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78 =============
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79
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80 Configured in-band by supporting clients.
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81
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82 [^1]: As defined in mod_cloud_notify, or mod_csi_simple.