--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_auth_ha1/mod_auth_ha1.lua	Sat Jul 26 21:53:52 2014 +0100
@@ -0,0 +1,101 @@
+-- Prosody IM
+-- Copyright (C) 2014 Matthew Wild
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+local usermanager = require "core.usermanager";
+local new_sasl = require "util.sasl".new;
+
+local nodeprep = require "util.encodings".stringprep.nodeprep;
+local nameprep = require "util.encodings".stringprep.nameprep;
+local md5 = require "util.hashes".md5;
+
+local host = module.host;
+
+local auth_filename = module:get_option_string("auth_ha1_file", "auth.txt");
+local auth_data = {};
+
+function reload_auth_data()
+	local f, err = io.open(auth_filename);
+	if not f then
+		module:log("error", "Failed to read from auth file: %s", err);
+		return;
+	end
+	auth_data = {};
+	local line_number, imported_count, not_authorized_count = 0, 0, 0;
+	for line in f:lines() do
+		line_number = line_number + 1;
+		local username, hash, realm, state = line:match("^([^:]+):(%x+):([^:]+):(.+)$");
+		if not username then
+			module:log("error", "Unable to parse line %d of auth file, skipping", line_number);
+		else
+			username, realm = nodeprep(username), nameprep(realm);
+			if not username then
+				module:log("error", "Invalid username on line %d of auth file, skipping", line_number);
+			elseif not realm then
+				module:log("error", "Invalid hostname/realm on line %d of auth file, skipping", line_number);
+			elseif state ~= "authorized" then
+				not_authorized_count = not_authorized_count + 1;
+			elseif realm == host then
+				auth_data[username] = hash;
+				imported_count = imported_count + 1;
+			end
+		end
+	end
+	f:close();
+	module:log("debug", "Loaded %d accounts from auth file (%d authorized)", imported_count, imported_count-not_authorized_count);
+end
+
+function module.load()
+	reload_auth_data();
+end
+
+module:hook_global("config-reloaded", reload_auth_data);
+
+-- define auth provider
+local provider = {};
+
+function provider.test_password(username, password)
+	module:log("debug", "test password for user %s at host %s, %s", username, host, password);
+
+	local test_hash = md5(username..":"..host..":"..password, true);
+
+	if test_hash == auth_data[username] then
+		return true;
+	else
+		return nil, "Auth failed. Invalid username or password.";
+	end
+end
+
+function provider.set_password(username, password)
+	return nil, "Changing passwords not supported";
+end
+
+function provider.user_exists(username)
+	if not auth_data[username] then
+		module:log("debug", "account not found for username '%s' at host '%s'", username, host);
+		return nil, "Auth failed. Invalid username";
+	end
+	return true;
+end
+
+function provider.create_user(username, password)
+	return nil, "User creation not supported";
+end
+
+function provider.delete_user(username)
+	return nil , "User deletion not supported";
+end
+
+function provider.get_sasl_handler()
+	return new_sasl(host, {
+		plain_test = function(sasl, username, password, realm)
+			return usermanager.test_password(username, realm, password), true;
+		end
+	});
+end
+
+module:provides("auth", provider);
+