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|
%%%----------------------------------------------------------------------
%%% File : extauth.erl
%%% Author : Leif Johansson <leifj@it.su.se>
%%% Purpose : External authentication using a simple port-driver
%%% Created : 30 Jul 2004 by Leif Johansson <leifj@it.su.se>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(extauth).
-author('leifj@it.su.se').
-export([start/1, stop/0, init/1,
check_password/2, set_password/2, is_user_exists/1 ]).
start(ExtPrg) ->
spawn(?MODULE, init, [ExtPrg]).
init(ExtPrg) ->
register(eauth,self()),
process_flag(trap_exit,true),
Port = open_port({spawn, ExtPrg}, [{packet,2}]),
loop(Port).
stop() ->
eauth ! stop.
check_password(User,Password) ->
call_port(["auth",User,Password]).
is_user_exists(User) ->
call_port(["isuser",User]).
set_password(User,Password) ->
call_port(["setpass",User,Password]).
call_port(Msg) ->
eauth ! {call, self(), Msg},
receive
{eauth,Result}->
Result
end.
loop(Port) ->
receive
{call, Caller, Msg} ->
Port ! {self(), {command, encode(Msg)}},
receive
{Port, {data, Data}} ->
Caller ! {eauth, decode(Data)}
end,
loop(Port);
stop ->
Port ! {self(), close},
receive
{Port, closed} ->
exit(normal)
end;
{'EXIT', Port, Reason} ->
io:format("~p ~n", [Reason]),
exit(port_terminated)
end.
join(List, Sep) ->
lists:foldl(fun(A, "") -> A;
(A, Acc) -> Acc ++ Sep ++ A
end, "", List).
encode(L) ->
join(L,":").
decode([0,0]) ->
false;
decode([0,1]) ->
true.
|
