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mod_pottymouth

The 'mod_pottymouth' ejabberd module aims to fill the void left by 'mod_shit' which has disappeared from the net. It allows individual whole words of a message to be filtered against a blacklist. It allows multiple blacklists sharded by language. To make use of this module the client must add the xml:lang attribute to the message xml.

Installation

On Ubuntu:

cd ~/.ejabberd-modules/sources
clone the git repo
cd mod_pottymouth
ejabberdctl module_install mod_pottymouth
ejabberdctl restart

module will be installed in: ~/.ejabberd-modules/mod_pottymouth

Config

The file format is as follows:

modules:
    mod_pottymouth:
        blacklists:
            default: /home/your_user/blacklist_en.txt
            en: /home/your_user/blacklist_en.txt
            cn: /home/your_user/blacklist_cn.txt
            fr: /home/your_user/blacklist_fr.txt

For each language (en,cn,fr,...whatever) provide a full path to a backlist file. The blacklist file is a plain text file with blacklisted words listed one per line.

Gotchas

The language will be looked up by whatever value is passed in the xml:lang attribute of the xml message. So, any xml:lang value to be supported will need a corresponding entry/blacklist in the config file. If xml:lang is missing, the 'default' entry in config will be used.

For xml:lang attribute docs, see: http://wiki.xmpp.org/web/Programming_XMPP_Clients#Sending_a_message

The internal bloomfilter used to ingest the blacklists currently requires about 4,000 entries in the blacklist to ensure acceptable error probability. (We've gotten around this by duplicating entries in a short list)

Todo

Look into acceptable error probabilities for shorter blacklists.

Tip of the hat

This mod makes use of the excellent 'etbloom' module: https://github.com/erlangtoolbox/etbloom

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