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filter.lua
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filter.lua
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--[[
mattata v2.0 - Filter Plugin
]]
local plugin = {}
plugin.name = 'filter'
plugin.category = 'admin'
plugin.description = 'Add content filters to the group'
plugin.commands = { 'filter', 'addfilter' }
plugin.help = '/filter <pattern> [action] - Adds a filter. Actions: delete (default), warn, ban, kick.'
plugin.group_only = true
plugin.admin_only = true
function plugin.on_message(api, message, ctx)
local tools = require('telegram-bot-lua.tools')
if not message.args then
return api.send_message(message.chat.id, 'Usage: /filter <pattern> [action]\nActions: delete (default), warn, ban, kick, mute', { parse_mode = 'html' })
end
local VALID_ACTIONS = { delete = true, warn = true, ban = true, kick = true, mute = true }
local pattern, action
local last_word = message.args:match('(%S+)$')
if last_word and VALID_ACTIONS[last_word:lower()] and message.args:match('^(.+)%s+%S+$') then
pattern, action = message.args:match('^(.+)%s+(%S+)$')
action = action:lower()
else
pattern = message.args
action = 'delete'
end
pattern = pattern:match('^%s*(.-)%s*$') -- trim
if pattern == '' then
return api.send_message(message.chat.id, 'Please provide a pattern to filter.')
end
-- validate pattern syntax
local ok = pcall(string.match, '', pattern)
if not ok then
return api.send_message(message.chat.id, 'Invalid pattern. Please provide a valid Lua pattern.')
end
-- reject patterns that could cause catastrophic backtracking
if #pattern > 128 then
return api.send_message(message.chat.id, 'Pattern too long (max 128 characters).')
end
local wq_count = 0
do
local i = 1
while i <= #pattern do
if pattern:sub(i, i) == '%' then
i = i + 2
elseif pattern:sub(i, i) == '.' and i < #pattern then
local nc = pattern:sub(i + 1, i + 1)
if nc == '+' or nc == '*' or nc == '-' then wq_count = wq_count + 1 end
i = i + 1
else
i = i + 1
end
end
end
if wq_count > 3 then
return api.send_message(message.chat.id, 'Pattern too complex (too many wildcard repetitions).')
end
-- check for duplicate
local existing = ctx.db.call('sp_get_filter', { message.chat.id, pattern })
if existing and #existing > 0 then
-- update the action if filter already exists
ctx.db.call('sp_update_filter_action', { action, message.chat.id, pattern })
require('src.core.session').invalidate_cached_list(message.chat.id, 'filters')
return api.send_message(message.chat.id, string.format(
'Filter <code>%s</code> updated with action: <b>%s</b>.',
tools.escape_html(pattern), action
), { parse_mode = 'html' })
end
ctx.db.call('sp_insert_filter', { message.chat.id, pattern, action, message.from.id })
-- invalidate filter cache
require('src.core.session').invalidate_cached_list(message.chat.id, 'filters')
api.send_message(message.chat.id, string.format(
'Filter added: <code>%s</code> (action: <b>%s</b>)',
tools.escape_html(pattern), action
), { parse_mode = 'html' })
end
return plugin

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