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adding mod_pottymouth

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Tom Quackenbush 2016-06-24 15:34:37 +00:00
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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.
To install in ejabberd:
cd ~/.ejabberd-modules/sources
clone the git repo
cd mod_pottymouth
edit: ./conf/mod_pottymouth.yml
make sure ejabberd is running
run: ejabberdctl module_install mod_pottymouth
run: ejabberdctl restart
module will be installed in: ~/.ejabberd-modules/mod_pottymouth
Config file format:
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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modules:
mod_pottymouth:
blacklists:
default: /home/vagrant/blacklist_en.txt
en: /home/vagrant/blacklist_en.txt
cn: /home/vagrant/blacklist_cn.txt
fr: /home/vagrant/blacklist_fr.txt

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author: "Tom Quackenbush <tom at madglory.com>"
category: "data"
summary: "Filter bad words in messages"
home: "https://github.com/madglory/mod_pottymouth/tree/master"
url: "git@github.com:madglory/mod_pottymouth.git"

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-module(bloom_gen_server).
-behaviour(gen_server).
-include("logger.hrl").
-import(etbloom, [bloom/1, member/2]).
-export([start/1]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-compile(export_all).
serverName(Lang) ->
list_to_atom(lists:flatten([atom_to_list(?MODULE), "_", atom_to_list(Lang)])).
member({Lang, Word} = _MessageToken) ->
gen_server:call(serverName(Lang), {member, Word}).
loadWordList(BlacklistFile) ->
BlacklistExists = filelib:is_file(BlacklistFile),
if
BlacklistExists ->
{ok, S} = file:read_file(BlacklistFile);
true ->
?ERROR_MSG("Blacklist file not found: ~p~n", [BlacklistFile]),
S = <<>>
end,
WordList = string:tokens(binary_to_list(S), "\n"),
WordList.
start({Lang, BlacklistFile} = _Opts) ->
gen_server:start_link({local, serverName(Lang)}, ?MODULE, [BlacklistFile], []).
init([BlacklistFile]) ->
WordList = loadWordList(BlacklistFile),
{ok, etbloom:bloom(WordList)}.
handle_call({member, Word}, _From, Bloom) ->
Reply = etbloom:member(Word, Bloom),
{reply, Reply, Bloom}.
handle_cast(_Msg, State) -> {noreply, State}.
handle_info(_Info, State) -> {noreply, State}.
terminate(_Reason, _State) -> ok.
code_change(_OldVsn, State, _Extra) -> {ok, State}.

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%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved via the world wide web at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
-module(etbloom).
-author("Paulo Sergio Almeida <psa@di.uminho.pt>").
-export([sbf/1, sbf/2, sbf/3, sbf/4,
bloom/1, bloom/2,
member/2, add/2,
size/1, capacity/1]).
-export([is_element/2, add_element/2]). % alternative names
-import(math, [log/1, pow/2]).
is_element(E, B) -> member(E, B).
add_element(E, B) -> add(E, B).
%% Based on
%% Scalable Bloom Filters
%% Paulo Sérgio Almeida, Carlos Baquero, Nuno Preguiça, David Hutchison
%% Information Processing Letters
%% Volume 101, Issue 6, 31 March 2007, Pages 255-261
%%
%% Provides scalable bloom filters that can grow indefinitely while
%% ensuring a desired maximum false positive probability. Also provides
%% standard partitioned bloom filters with a maximum capacity. Bit arrays
%% are dimensioned as a power of 2 to enable reusing hash values across
%% filters through bit operations. Double hashing is used (no need for
%% enhanced double hashing for partitioned bloom filters).
%%
-record(bloom, {
e, % error probability
n, % maximum number of elements
mb, % 2^mb = m, the size of each slice (bitvector)
size, % number of elements
a % list of bitvectors
}).
-record(sbf, {
e, % error probability
r, % error probability ratio
s, % log 2 of growth ratio
size, % number of elements
b % list of plain bloom filters
}).
%% Constructors for (fixed capacity) bloom filters
%%
%% N - capacity
%% E - error probability
bloom(L) when is_list(L) -> lists:foldl(fun(X, Bloom) -> add(X, Bloom) end, bloom(length(L)), L);
bloom(N) when is_integer(N) -> bloom(N, 0.001).
bloom(N, E) when is_number(N), N > 0,
is_float(E), E > 0, E < 1,
N >= 4 / E -> % rule of thumb; due to double hashing
bloom(size, N, E).
bloom(Mode, Dim, E) ->
K = 1 + trunc(log2(1 / E)),
P = pow(E, 1 / K),
case Mode of
size -> Mb = 1 + trunc(-log2(1 - pow(1 - P, 1 / Dim)));
bits -> Mb = Dim
end,
M = 1 bsl Mb,
N = trunc(log(1 - P) / log(1 - 1 / M)),
#bloom{e = E, n = N, mb = Mb, size = 0,
a = [hipe_bifs:bitarray(1 bsl Mb, false) || _ <- lists:seq(1, K)]}.
log2(X) -> log(X) / log(2).
%% Constructors for scalable bloom filters
%%
%% N - initial capacity before expanding
%% E - error probability
%% S - growth ratio when full (log 2) can be 1, 2 or 3
%% R - tightening ratio of error probability
sbf(N) -> sbf(N, 0.001).
sbf(N, E) -> sbf(N, E, 1).
sbf(N, E, 1) -> sbf(N, E, 1, 0.85);
sbf(N, E, 2) -> sbf(N, E, 2, 0.75);
sbf(N, E, 3) -> sbf(N, E, 3, 0.65).
sbf(N, E, S, R) when is_number(N), N > 0,
is_float(E), E > 0, E < 1,
is_integer(S), S > 0, S < 4,
is_float(R), R > 0, R < 1,
N >= 4 / (E * (1 - R)) -> % rule of thumb; due to double hashing
#sbf{e = E, s = S, r = R, size = 0, b = [bloom(N, E * (1 - R))]}.
%% Returns number of elements
%%
size(#bloom{size = Size}) -> Size;
size(#sbf{size = Size}) -> Size.
%% Returns capacity
%%
capacity(#bloom{n = N}) -> N;
capacity(#sbf{}) -> infinity.
%% Test for membership
%%
member(Elem, #bloom{mb = Mb} = B) ->
Hashes = make_hashes(Mb, Elem),
hash_member(Hashes, B);
member(Elem, #sbf{b = [H | _]} = Sbf) ->
Hashes = make_hashes(H#bloom.mb, Elem),
hash_member(Hashes, Sbf).
hash_member(Hashes, #bloom{mb = Mb, a = A}) ->
Mask = 1 bsl Mb - 1,
{I1, I0} = make_indexes(Mask, Hashes),
all_set(Mask, I1, I0, A);
hash_member(Hashes, #sbf{b = B}) ->
lists:any(fun(X) -> hash_member(Hashes, X) end, B).
make_hashes(Mb, E) when Mb =< 16 ->
erlang:phash2({E}, 1 bsl 32);
make_hashes(Mb, E) when Mb =< 32 ->
{erlang:phash2({E}, 1 bsl 32), erlang:phash2([E], 1 bsl 32)}.
make_indexes(Mask, {H0, H1}) when Mask > 1 bsl 16 -> masked_pair(Mask, H0, H1);
make_indexes(Mask, {H0, _}) -> make_indexes(Mask, H0);
make_indexes(Mask, H0) -> masked_pair(Mask, H0 bsr 16, H0).
masked_pair(Mask, X, Y) -> {X band Mask, Y band Mask}.
all_set(_Mask, _I1, _I, []) -> true;
all_set(Mask, I1, I, [H | T]) ->
case hipe_bifs:bitarray_sub(H, I) of
true -> all_set(Mask, I1, (I + I1) band Mask, T);
false -> false
end.
%% Adds element to set
%%
add(Elem, #bloom{mb = Mb} = B) ->
Hashes = make_hashes(Mb, Elem),
hash_add(Hashes, B);
add(Elem, #sbf{size = Size, r = R, s = S, b = [H | T] = Bs} = Sbf) ->
#bloom{mb = Mb, e = E, n = N, size = HSize} = H,
Hashes = make_hashes(Mb, Elem),
case hash_member(Hashes, Sbf) of
true -> Sbf;
false ->
case HSize < N of
true -> Sbf#sbf{size = Size + 1, b = [hash_add(Hashes, H) | T]};
false ->
B = add(Elem, bloom(bits, Mb + S, E * R)),
Sbf#sbf{size = Size + 1, b = [B | Bs]}
end
end.
hash_add(Hashes, #bloom{mb = Mb, a = A, size = Size} = B) ->
Mask = 1 bsl Mb - 1,
{I1, I0} = make_indexes(Mask, Hashes),
case all_set(Mask, I1, I0, A) of
true -> B;
false -> B#bloom{size = Size + 1, a = set_bits(Mask, I1, I0, A, [])}
end.
set_bits(_Mask, _I1, _I, [], Acc) -> lists:reverse(Acc);
set_bits(Mask, I1, I, [H | T], Acc) ->
set_bits(Mask, I1, (I + I1) band Mask, T, [hipe_bifs:bitarray_update(H, I, true) | Acc]).

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-module(mod_pottymouth).
-behaviour(gen_mod).
-include("logger.hrl").
-export([
start/2,
stop/1,
on_filter_packet/1,
mod_opt_type/1
]).
-include("ejabberd.hrl").
-import(bloom_gen_server, [start/0, stop/0, member/1]).
getMessageLang(Attrs) ->
LangAttr = lists:keyfind(<<"lang">>, 1, Attrs),
if
LangAttr ->
{<<"lang">>, LangBin} = LangAttr,
Lang = list_to_atom(binary_to_list(LangBin));
true ->
Lang = default
end,
Lang.
censorWord({_Lang, Word} = MessageTerm) ->
IsBadWord = bloom_gen_server:member(MessageTerm),
if
IsBadWord ->
"****";
true ->
Word
end.
filterWords(L) ->
lists:map(fun censorWord/1, L).
start(_Host, Opts) ->
Blacklists = gen_mod:get_opt(blacklists, Opts, fun(A) -> A end, []),
lists:map(fun bloom_gen_server:start/1, Blacklists),
ejabberd_hooks:add(filter_packet, global, ?MODULE, on_filter_packet, 0),
ok.
stop(_Host) ->
bloom_gen_server:stop(),
ejabberd_hooks:delete(filter_packet, global, ?MODULE, on_filter_packet, 0),
ok.
on_filter_packet(drop) ->
drop;
on_filter_packet({_From, _To, {xmlel, <<"message">>, Attrs, [_chatState, {xmlel, <<"body">>, _BodyAttr, [{xmlcdata, MessageText}] = _BodyCData} = _MessageBody] = _Els} = _Packet} = _Msg) ->
Lang = getMessageLang(Attrs),
MessageWords = string:tokens(binary_to_list(MessageText), " "),
MessageTerms = [{Lang, Word} || Word <- MessageWords],
FilteredMessageWords = list_to_binary(string:join(filterWords(MessageTerms), " ")),
{_From, _To, {xmlel, <<"message">>, Attrs, [_chatState, {xmlel, <<"body">>, _BodyAttr, [{xmlcdata, FilteredMessageWords}]}]}};
on_filter_packet(Msg) ->
% Handle the generic case (any packet that isn't a message with a body).
Msg.
mod_opt_type(blacklists) -> fun (A) when is_list(A) -> A end;
mod_opt_type(_) -> [blacklists].