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filter.lua
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filter.lua
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--[[
Copyright 2020 Matthew Hesketh <matthew@matthewhesketh.com>
This code is licensed under the MIT. See LICENSE for details.
]]
local filter = {}
local mattata = require('mattata')
local json = require('dkjson')
local redis = require('libs.redis')
function filter:init()
filter.commands = mattata.commands(self.info.username):command('filter').table
filter.help = '/filter <words> - Add to the list of words that users will be kicked upon for saying. This feature requires the bot to have administrative permissions. The kick will only be a soft-ban (meaning the targeted user is able to return to the chat immediately), unless the "Ban Not Kick" setting is enabled in the /administration menu.'
end
function filter:on_message(message, configuration, language)
if message.chat.type ~= 'supergroup'
then
return mattata.send_reply(
message,
language['errors']['supergroup']
)
elseif not mattata.is_group_admin(
message.chat.id,
message.from.id
)
then
return mattata.send_reply(
message,
language['errors']['admin']
)
end
local input = mattata.input(message.text)
if not input
or not input:match('%w+')
then
return mattata.send_reply(
message,
filter.help
)
end
local new_total = 0
local words = {}
for word in input:gmatch('%w+')
do
table.insert(
words,
word
)
end
local total = redis:smembers('word_filter:' .. message.chat.id)
if #total + #words >= 200
then
local remaining = 200 - #total
return mattata.send_reply(
message,
'You may only have 200 words filtered at a time. There are currently ' .. tostring(#total) .. ' word(s) filtered in this chat, so you may only add up to ' .. tostring(remaining) .. ' more.'
)
end
local new = {}
for n, word in pairs(words)
do
if not redis:sismember(
'word_filter:' .. message.chat.id,
word
)
then
local success = redis:sadd(
'word_filter:' .. message.chat.id,
word
)
if success
then
table.insert(
new,
word
)
end
end
end
return mattata.send_message(
message.chat.id,
tostring(#new) .. ' word(s) have been added to this chat\'s word filter. Use /unfilter <words> to remove words from this filter.'
)
end
return filter

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