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-rw-r--r--plugins/degesch/censor.lua74
1 files changed, 74 insertions, 0 deletions
diff --git a/plugins/degesch/censor.lua b/plugins/degesch/censor.lua
new file mode 100644
index 0000000..3691c6d
--- /dev/null
+++ b/plugins/degesch/censor.lua
@@ -0,0 +1,74 @@
+--
+-- censor.lua: black out certain users' messages
+--
+-- Copyright (c) 2016, Přemysl Janouch <p.janouch@gmail.com>
+--
+-- Permission to use, copy, modify, and/or distribute this software for any
+-- purpose with or without fee is hereby granted, provided that the above
+-- copyright notice and this permission notice appear in all copies.
+--
+-- 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
+
+degesch.setup_config {
+ masks = {
+ type = "string_array",
+ default = "\"\"",
+ comment = "user masks (optionally \"/#channel\") to censor",
+ on_change = read_masks
+ },
+}
+
+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 .. "\x0301,01" .. rest or "\x0301,01" .. 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)