--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_extauth/mod_extauth.lua	Sat May 15 23:05:53 2010 +0500
@@ -0,0 +1,83 @@
+
+
+local nodeprep = require "util.encodings".stringprep.nodeprep;
+local process = require "process";
+
+local script_type = module:get_option("extauth_type");
+assert(script_type == "ejabberd");
+local command = module:get_option("extauth_command");
+assert(type(command) == "string");
+local host = module.host;
+assert(not host:find(":"));
+
+local proc;
+local function send_query(text)
+	if not proc then
+		proc = process.popen(command);
+	end
+	proc:write(text);
+	proc:flush();
+	return proc:read(4); -- FIXME do properly
+end
+
+function do_query(kind, username, password)
+	if not username then return nil, "not-acceptable"; end
+	username = nodeprep(username);
+	if not username then return nil, "jid-malformed"; end
+	
+	local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
+	local len = #query
+	if len > 1000 then return nil, "policy-violation"; end
+	
+	local lo = len % 256;
+	local hi = (len - lo) / 256;
+	query = string.char(hi, lo)..query;
+	
+	local response = send_query(query);
+	if response == "\0\2\0\0" then
+		return nil, "not-authorized";
+	elseif response == "\0\2\0\1" then
+		return true;
+	else
+		proc = nil; -- TODO kill proc
+		return nil, "internal-server-error";
+	end
+end
+
+local provider = { name = "extauth" };
+
+function provider.test_password(username, password)
+	return do_query("auth", username, password);
+end
+
+function provider.set_password(username, password)
+	return do_query("setpass", username, password);
+end
+
+function provider.user_exists(username)
+	return do_query("isuser", username);
+end
+
+function provider.get_password() return nil, "Passwords not available."; end
+function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
+function provider.get_supported_methods() return {["PLAIN"] = true}; end
+local config = require "core.configmanager";
+local usermanager = require "core.usermanager";
+local jid_bare = require "util.jid".bare;
+function provider.is_admin(jid)
+	local admins = config.get(host, "core", "admins");
+	if admins ~= config.get("*", "core", "admins") then
+		if type(admins) == "table" then
+			jid = jid_bare(jid);
+			for _,admin in ipairs(admins) do
+				if admin == jid then return true; end
+			end
+		elseif admins then
+			log("error", "Option 'admins' for host '%s' is not a table", host);
+		end
+	end
+	return usermanager.is_admin(jid); -- Test whether it's a global admin instead
+end
+
+
+module:add_item("auth-provider", provider);