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mod_mam: Include an in-memory fallback driver
author Kim Alvefur <zash@zash.se>
date Tue, 19 Jan 2016 17:47:47 +0100
parents 66aaf7c3cb29
children 4bf60727459b
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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-0355 (Namespace Delegation) implementation'
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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 Namespace Delegation is an extension which allows server to delegate
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11 some features handling to an entity/component. Typical use case is an
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12 external PEP service, but it can be used more generally when your
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13 prefered server lack one internal feature and you found an external
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14 component which can do it.
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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 You can have all the details by reading the
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20 [XEP-0355](http://xmpp.org/extensions/xep-0355.html). Only the admin
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21 mode is implemented so far.
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22
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23 Usage
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24 =====
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25
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26 To use the module, like usual add **"delegation"** to your
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27 modules\_enabled. Note that if you use it with a local component, you
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28 also need to activate the module in your component section:
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29
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30 modules_enabled = {
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31 [...]
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32
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33 "delegation";
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34 }
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35
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36 [...]
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38 Component "youcomponent.yourdomain.tld"
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39 component_secret = "yourpassword"
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40 modules_enabled = {"delegation"}
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41
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42 then specify delegated namespaces **in your host section** like that:
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43
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44 VirtualHost "yourdomain.tld"
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45
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46 delegations = {
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47 ["urn:xmpp:mam:0"] = {
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48 filtering = {"node"};
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49 jid = "pubsub.yourdomain.tld";
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50 },
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51 ["http://jabber.org/protocol/pubsub"] = {
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52 jid = "pubsub.yourdomain.tld";
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53 },
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54 }
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56 Here all MAM requests with a "node" attribute (i.e. all MAM pubsub
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57 request) will be delegated to pubsub.yourdomain.tld. Similarly, all
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58 pubsub request to the host (i.e. the PEP requests) will be delegated to
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59 pubsub.yourdomain.tld.
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60
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61 **/! Be extra careful when you give a delegation to an entity/component,
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62 it's a powerful access, only do it if you absoly trust the
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63 component/entity, and you know where the software is coming from**
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64
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65 Configuration
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66 =============
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67
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68 The configuration is done with a table which map delegated namespace to
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69 namespace data. Namespace data MUST have a **jid** (in the form **jid =
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70 "delegated@domain.tld"**) and MAY have an additional **filtering**
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71 array. If filtering is present, request with attributes in the array
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72 will be delegated, other will be treated normally (i.e. by Prosody).
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73
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74 If your are not a developper, the delegated namespace(s)/attribute(s)
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75 are most probably specified with the external component/entity you want
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76 to use.
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78 Compatibility
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79 =============
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80
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81 If you use it with Prosody 0.9 and a component, you need to patch
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82 core/mod\_component.lua to fire a new signal. To do it, copy the
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83 following patch in a, for example, /tmp/component.patch file:
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84
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85 diff --git a/plugins/mod_component.lua b/plugins/mod_component.lua
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86 --- a/plugins/mod_component.lua
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87 +++ b/plugins/mod_component.lua
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88 @@ -85,6 +85,7 @@
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89 session.type = "component";
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90 module:log("info", "External component successfully authenticated");
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91 session.send(st.stanza("handshake"));
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92 + module:fire_event("component-authenticated", { session = session });
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93
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94 return true;
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95 end
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96
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97 Then, at the root of prosody, enter:
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98
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99 `patch -p1 < /tmp/component.patch`
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100
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101 ----- ----------------------------------------------------
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102 0.10 Works
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103 0.9 Need a patched core/mod\_component.lua (see above)
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104 ----- ----------------------------------------------------
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105
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106 Note
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107 ====
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108
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109 This module is often used with mod\_privilege (c.f. XEP for more
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110 details)