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mod_compression_unsafe/README.md

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mod_compression_unsafe/README.md @ 6080:9ab0d1c75c26

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author Kim Alvefur <zash@zash.se>
date Sat, 07 Dec 2024 22:54:32 +0100
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1 ---
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2 labels:
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3 - 'Stage-Deprecated'
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4 summary: 'Implementation of XEP-0138'
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5 ...
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6
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7 ::: {.alert .alert-warning}
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8 **NOTE:** XMPP compression has unresolved [security concerns](https://mail.jabber.org/pipermail/standards/2014-October/029215.html),
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9 and this module has been removed from Prosody and renamed.
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10 :::
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11
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12 While the bandwidth usage of XMPP isn't that much, compressing the data
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13 sent to/from your server can give significant benefits to those on slow
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14 connections, such as dial-up or mobile networks. Prosody supports
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15 compression for client-to-server (if your client supports it) and
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16 server-to-server streams using the mod\_compression plugin.
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17
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18 # Details
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19
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20 mod\_compression implements [XEP-0138], and supports the zlib compression
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21 algorithm.
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22
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23 ## Dependencies
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24
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25 The XMPP protocol specifies that all clients and servers supporting
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26 compression must support the "zlib" compression method, and this is what
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27 Prosody uses. However you will need to install zlib support for Lua on
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28 your system. There are different ways of doing this depending on your
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29 system. If in doubt whether it is installed correctly, the command
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30 `lua -lzlib` in a console should open a Lua prompt with no errors.
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32 Debian/Ubuntu
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33 : `apt-get install lua-zlib`
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35 LuaRocks
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36 : `luarocks install lua-zlib`
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37
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38 Source
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39 : <https://github.com/brimworks/lua-zlib>
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40
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41 # Usage
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42
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43 ``` lua
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44 modules_enabled = {
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45 -- Other modules
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46 "compression_unsafe"; -- Enable mod_compression_unsafe
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47 }
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48 ```
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49
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50 ## Configuration
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51
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52 The compression level can be set using the `compression_level` option
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53 which can be a number from 1 to 9. Higher compression levels will use
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54 more resources but less bandwidth.
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55
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56 ## Example
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57
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58 ``` lua
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59 modules_enabled = {
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60 -- Other modules
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61 "compression_unsafe"; -- Enable mod_compression_unsafe
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62 }
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63  
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64 compression_level = 5
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65 ```