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--
-- censor.lua: black out certain users' messages
--
-- Copyright (c) 2016 - 2021, Přemysl Eric Janouch <p@janouch.name>
--
-- Permission to use, copy, modify, and/or distribute this software for any
-- purpose with or without fee is hereby granted.
--
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
-- OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
--
local to_pattern = function (mask)
if not mask:match ("!") then mask = mask .. "!*" end
if not mask:match ("@") then mask = mask .. "@*" end
-- That is, * acts like a wildcard, otherwise everything is escaped
return "^" .. mask:gsub ("[%^%$%(%)%%%.%[%]%+%-%?]", "%%%0")
:gsub ("%*", ".*") .. "$"
end
local patterns = {}
local read_masks = function (v)
patterns = {}
local add = function (who, where)
local channels = patterns[who] or {}
table.insert (channels, where)
patterns[who] = channels
end
for item in v:lower ():gmatch ("[^,]+") do
local who, where = item:match ("^([^/]+)/*(.*)")
if who then add (to_pattern (who), where == "" or where) end
end
end
local quote
degesch.setup_config {
masks = {
type = "string_array",
default = "\"\"",
comment = "user masks (optionally \"/#channel\") to censor",
on_change = read_masks
},
quote = {
type = "string",
default = "\"\\x0301,01\"",
comment = "formatting prefix for censored messages",
on_change = function (v) quote = v end
},
}
local decolor = function (text)
local rebuilt, last = {""}, 1
for start in text:gmatch ('()\x03') do
table.insert (rebuilt, text:sub (last, start - 1))
local sub = text:sub (start + 1)
last = start + (sub:match ('^%d%d?,%d%d?()') or sub:match ('^%d?%d?()'))
end
return table.concat (rebuilt) .. text:sub (last)
end
local censor = function (line)
-- Taking a shortcut to avoid lengthy message reassembly
local start, text = line:match ("^(.- PRIVMSG .- :)(.*)$")
local ctcp, rest = text:match ("^(\x01%g+ )(.*)")
text = ctcp and ctcp .. quote .. decolor (rest) or quote .. decolor (text)
return start .. text
end
degesch.hook_irc (function (hook, server, line)
local msg = degesch.parse (line)
if msg.command ~= "PRIVMSG" then return line end
local channel = msg.params[1]:lower ()
for who, where in pairs (patterns) do
if msg.prefix:lower ():match (who) then
for _, x in pairs (where) do
if x == true or x == channel then
return censor (line)
end
end
end
end
return line
end)
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