prosody-modules
048e339706ba
mod_client_proxy/README.markdown

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mod_client_proxy/README.markdown @ 5119:048e339706ba

mod_rest: Remove manual reference expansion in schema This hack was originally added to reduce the number of definitions of common attributes (type, to, from etc) and payloads (e.g. delay). This predated pointers and references, and until now was needed because parsing picked out the correct stanza kind from the schema, which broke internal references. Removing this hack paves the way for allowing the schema to be configured or customized more easily.
author Kim Alvefur <zash@zash.se>
date Tue, 20 Dec 2022 21:48:28 +0100
parent 4318:3dd7840cb923
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 summary: 'Proxy multiple client resources behind a single component'
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5 ...
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6
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7 What it does
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8 ============
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9
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10 This module must be used as a component. For example:
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11
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12 Component "proxy.domain.example" "client_proxy"
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13 target_address = "some-user@some-domain.example"
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15 All IQ requests against the proxy host (in the above example:
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16 proxy.domain.example) are sent to a random resource of the target address (in
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17 the above example: some-user@some-domain.example). The entity behind the
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18 target address is called the "implementing client".
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19
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20 The IQ requests are JAT-ed (JAT: Jabber Address Translation) so that when the
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21 implementing client answers the IQ request, it is sent back to the component,
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22 which reverts the translation and routes the reply back to the user.
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23
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24 Let us assume that user@some-domain.example sends a request. The
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25 proxy.domain.example component has the client_proxy module loaded and proxies to
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26 some-user@some-domain.example. some-user@some-domain.example has two resources,
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27 /a and /b.
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28
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29 user -> component:
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30 <iq type='get' id='1234' to='proxy.domain.example' from='user@some-domain.example/abc'>
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31 component -> implementing client:
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32 <iq type='get' id='1234' to='some-user@some-domain.example/a' from='proxy.domain.example/encoded-from'>
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33 implementing client -> component:
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34 <iq type='result' id='1234' to='proxy.domain.example/encoded-from' from='some-user@some-domain.example/a'>
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35 component -> user:
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36 <iq type='result' id='1234' to='user@some-domain.example/abc' from='proxy.domain.example'>
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37
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38 The encoded-from resource used in the exchange between the proxy component
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39 and the implementing client is an implementation-defined string which allows
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40 the proxy component to revert the JAT.
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43 Use cases
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44 =========
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46 * Implementation of services within clients instead of components, thus making
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47 use of the more advanced authentication features.
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48 * Load-balancing requests to different client resources.
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49 * General evilness
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52 Configuration
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53 =============
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54
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55 To use this module, it needs to be loaded on a component:
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56
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57 Component "proxy.yourdomain.example" "client_proxy"
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58 target_address = "implementation@yourdomain.example"
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59
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60 It will then send a subscription request to implementation@yourdomain.example
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61 which MUST be accepted: this is required so that the component can detect the
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62 resources to which IQ requests can be dispatched.
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63
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64
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65 Limitations
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66 ===========
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67
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68 * It does not handle presence or message stanzas.
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69 * It does not allow the implementing client to initiate IQ requests