1 files changed, 83 insertions, 0 deletions
diff --git a/sciteco-bot.lua b/sciteco-bot.lua
new file mode 100755
index 0000000..a8ecd79
--- /dev/null
+++ b/sciteco-bot.lua
@@ -0,0 +1,83 @@
+#!/usr/local/bin/lua54
+-- Logs the IRC channel at https://sciteco.fmsbw.de/irclogs/`date '+sciteco-%Y%m.log'`
+-- Monitored by daemon(8) and auto-rotates the logs.
+-- It does not require any cronjob.
+
+local socket = require "socket"
+
+local curdate, log
+
+local client = assert(socket.connect("irc.libera.chat", 6667))
+client:setoption("keepalive", true)
+
+local nick = "FSB"
+local channel = "#sciteco"
+
+client:send("NICK "..nick.."\r\n"..
+            "USER "..nick.." B * "..nick.."\r\n")
+socket.sleep(2)
+client:send("JOIN "..channel.."\r\n")
+
+local function handle_message(line)
+	if line:sub(1, 5) == "PING " then
+		-- we will be kicked if not responding to PINGs
+		client:send("PONG "..line:sub(6).."\r\n")
+		return
+	end
+
+	if os.date("%Y%m") ~= curdate then
+		-- rotate log
+		if log then log:close() end
+		curdate = os.date("%Y%m")
+		log = assert(io.open("/var/www/htdocs/projects/sciteco/irclogs/sciteco-"..curdate..".log", 'a+'))
+	end
+
+	local r_user, r_channel, r_msg = line:match("^:([^!]+)![^ ]+ PRIVMSG ([^ ]+) :(.*)")
+	if r_channel == channel then
+		-- message from user
+		log:write(os.date("%d %b %H:%M "), "<", r_user, "> ", r_msg, "\n"):flush()
+		return
+	end 
+
+	r_user, r_channel = line:match("^:([^!]+)![^ ]+ JOIN (.*)")
+	if r_channel == channel then
+		-- user has joined
+		log:write(os.date("%d %b %H:%M "), "-!- ", r_user, " has joined.\n"):flush()
+		return
+	end 
+
+	-- TODO: capture the optional message after `:` at the end
+	r_user, r_channel = line:match("^:([^!]+)![^ ]+ PART ([^ ]+)")
+	if r_channel == channel then
+		-- user has left the channel
+		log:write(os.date("%d %b %H:%M "), "-!- ", r_user, " has left.\n"):flush()
+		return
+	end 
+
+	-- TODO: capture the optional message after `:` at the end
+	r_user = line:match("^:([^!]+)![^ ]+ QUIT")
+	if r_user then
+		-- user has quit
+		log:write(os.date("%d %b %H:%M "), "-!- ", r_user, " has quit.\n"):flush()
+		return
+	end 
+end
+
+while true do
+	local line, err = client:receive('*l')
+	if not line then
+		io.stderr:write("ERROR: ", err, "\n")
+		-- we will be supervised and restarted by daemon(8)
+		-- FIXME: Does not reliably work.
+		-- Perhaps decrease the keepalive timeout?
+		os.exit(1)
+	end
+
+	-- print all messages from the server (for debugging)
+	-- NOTE: line does not contain any EOL characters
+	print(line)
+	handle_message(line)
+end
+
+client:close()
+log:close()