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mod_http_oauth2: Pedantic optimization Checking the length of the string seems like 30% more expensive than comparing it with the empty string (by reference, probably).
author Kim Alvefur <zash@zash.se>
date Sun, 26 Mar 2023 14:37:42 +0200
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1 ---
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2 labels:
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3 - Stage-Alpha
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4 summary: "Unified Push provider"
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5 ---
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6
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7 This module implements a [Unified Push](https://unifiedpush.org/) Provider
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8 that uses XMPP to talk to a Push Distributor (e.g. [Conversations](http://codeberg.org/iNPUTmice/Conversations)).
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9
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10 It allows push notifications to be delivered to apps on your device over XMPP.
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11 This means notifications can be delivered quickly and efficiently (apps don't
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12 need to repeatedly poll for new notifications).
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13
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14 For a list of compatible apps, see the [UnifiedPush apps list](https://unifiedpush.org/users/apps/).
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15
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16 A server-independent external component is also available - see [the 'up'
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17 project](https://codeberg.org/inputmice/up). That project also contains a
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18 description of the protocol between the XMPP server and the client.
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20 This module and the protocol it implements is at an experimental prototype
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21 stage.
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22
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23 Note that this module is **not related** to XEP-0357 push notifications for
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24 XMPP. It does not send push notifications to disconnected XMPP clients. For
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25 that, see [mod_cloud_notify](https://modules.prosody.im/mod_cloud_notify).
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26
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27 ## Configuration
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28
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29 | Name | Description | Default |
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30 |-------------------------------|---------------------------------------------------------|---------------------------------------------|
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31 | unified_push_acl | A list of domains or users permitted to use the service | current host, or parent host if a component |
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32 | unified_push_backend | Backend to use: "paseto", "storage" or "jwt" | "paseto" (trunk), "storage" (0.12) |
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33 | unified_push_registration_ttl | Maximum lifetime of a push registration (seconds) | `86400` (1 day) |
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34
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35 ### Backends
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36
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37 The module needs to track registrations, and be able to associate tokens with
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38 users. There are multiple ways to do this, but not every method is supported
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39 on every Prosody version.
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40
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41 By default the module will automatically select the best backend that is
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42 supported on the current Prosody version you are using.
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43
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44 #### storage backend
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45
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46 This is the default backend on Prosody 0.12 and earlier. It stores tokens and
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47 their associated data in Prosody's configured data store.
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48
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49 Supported by all Prosody versions.
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50
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51 #### paseto backend
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52
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53 This is a stateless (i.e. no storage required) backend that uses encrypted
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54 [PASETO tokens](https://paseto.io/) to store registration info. It is the
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55 default backend on Prosody trunk, as PASETO support is not available in
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56 Prosody 0.12 and earlier.
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57
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58 #### jwt backend
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59
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60 This is a stateless backend that uses [JWT tokens](https://jwt.io/) to store
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61 registration info. It is supported in Prosody 0.12 and higher.
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62
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63 **Note:** The JWT tokens are **not encrypted**, which means the JID
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64 associated with a registration is visible to apps and services that send you
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65 push notifications. This can have privacy implications. If in doubt, do not
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66 use this backend.
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67
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68 This backend requires you to set a secure random string in the config file,
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69 using the `unified_push_secret` option.
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70
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71 A random push secret can be generated with the command
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72 `openssl rand -base64 32`. Changing the secret will invalidate all existing
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73 push registrations.
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74
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75 ### HTTP configuration
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76
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77 This module exposes a HTTP endpoint (to receive push notifications from app
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78 servers). For more information on configuring HTTP services in Prosody, see
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79 [Prosody HTTP documentation](https://prosody.im/doc/http).
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80
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81 #### Example configuration
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82
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83 ##### Normal method
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84
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85 Just add just add `"unified_push"` to your `modules_enabled` option.
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86 This is the easiest and **recommended** configuration.
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87
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88 ``` {.lua}
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89 modules_enabled = {
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90 ---
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91 "unified_push";
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92 ---
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93 }
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94 ```
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95
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96 ##### Component method
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97
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98 This is an example of how to configure the module as an internal component,
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99 e.g. on a subdomain or other non-user domain.
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100
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101 This example creates a push notification component called
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102 'notify.example.com'.
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103
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104 The 'http_host' line instructs Prosody to expose this module's HTTP services
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105 on the 'example.com' host, which avoids needing to create/update DNS records
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106 and HTTPS certificates if example.com is already set up.
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107
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108 ``` {.lua}
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109 Component "notify.example.com" "unified_push"
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110 unified_push_secret = "<secret string here>"
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111 http_host = "example.com"
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112 ```
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113
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114 ## Compatibility
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115
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116 | trunk | Works |
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117 | 0.12 | Works |