%%%----------------------------------------------------------------------
%%% File    : ejabberd_auth_odbc.erl
%%% Author  : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : Authentification via ODBC
%%% Created : 12 Dec 2004 by Alexey Shchepin <alexey@sevcom.net>
%%% Id      : $Id$
%%%----------------------------------------------------------------------

-module(ejabberd_auth_odbc).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').

%% External exports
-export([start/1,
	 set_password/3,
	 check_password/3,
	 check_password/5,
	 try_register/3,
	 dirty_get_registered_users/0,
	 get_vh_registered_users/1,
	 get_password/2,
	 get_password_s/2,
	 is_user_exists/2,
	 remove_user/2,
	 remove_user/3,
	 plain_password_required/0
	]).

-include("ejabberd.hrl").

-record(passwd, {user, password}).

%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start(Host) ->
    ChildSpec =
	{gen_mod:get_module_proc(Host, ejabberd_odbc_sup),
	 {ejabberd_odbc_sup, start_link, [Host]},
	 temporary,
	 infinity,
	 supervisor,
	 [ejabberd_odbc_sup]},
    supervisor:start_child(ejabberd_sup, ChildSpec),
    ejabberd_ctl:register_commands(
      Host,
      [{"registered-users", "list all registered users"}],
      ejabberd_auth, ctl_process_get_registered),
    ok.

plain_password_required() ->
    false.

check_password(User, Server, Password) ->
    case jlib:nodeprep(User) of
	error ->
	    false;
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    case catch ejabberd_odbc:sql_query(
			 jlib:nameprep(Server),
			 ["select password from users "
			  "where username='", Username, "';"]) of
		{selected, ["password"], [{Password}]} ->
		    true;
		_ ->
		    false
	    end
    end.

check_password(User, Server, Password, StreamID, Digest) ->
    case jlib:nodeprep(User) of
	error ->
	    false;
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    case catch ejabberd_odbc:sql_query(
			 jlib:nameprep(Server),
			 ["select password from users "
			  "where username='", Username, "';"]) of
		{selected, ["password"], [{Passwd}]} ->
		    DigRes = if
				 Digest /= "" ->
				     Digest == sha:sha(StreamID ++ Passwd);
				 true ->
				     false
			     end,
		    if DigRes ->
			    true;
		       true ->
			    (Passwd == Password) and (Password /= "")
		    end;
		_ ->
		    false
	    end
    end.

set_password(User, Server, Password) ->
    case jlib:nodeprep(User) of
	error ->
	    {error, invalid_jid};
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    Pass = ejabberd_odbc:escape(Password),
	    LServer = jlib:nameprep(Server),
	    catch ejabberd_odbc:sql_transaction(
		    LServer,
		    [["delete from users where username='", Username ,"';"],
		     ["insert into users(username, password) "
		      "values ('", Username, "', '", Pass, "');"]])
    end.


try_register(User, Server, Password) ->
    case jlib:nodeprep(User) of
	error ->
	    {error, invalid_jid};
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    Pass = ejabberd_odbc:escape(Password),
	    case catch ejabberd_odbc:sql_query(
			 jlib:nameprep(Server),
			 ["insert into users(username, password) "
			  "values ('", Username, "', '", Pass, "');"]) of
		{updated, 1} ->
		    {atomic, ok};
		_ ->
		    {atomic, exists}
	    end
    end.

dirty_get_registered_users() ->
    get_vh_registered_users(?MYNAME).

get_vh_registered_users(Server) ->
    LServer = jlib:nameprep(Server),
    case catch ejabberd_odbc:sql_query(
		 LServer,
		 "select username from users") of
	{selected, ["username"], Res} ->
	    [{U, LServer} || {U} <- Res];
	_ ->
	    []
    end.

get_password(User, Server) ->
    case jlib:nodeprep(User) of
	error ->
	    false;
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    case catch ejabberd_odbc:sql_query(
			 jlib:nameprep(Server),
			 ["select password from users "
			  "where username='", Username, "';"]) of
		{selected, ["password"], [{Password}]} ->
		    Password;
		_ ->
		    false
	    end
    end.

get_password_s(User, Server) ->
    case jlib:nodeprep(User) of
	error ->
	    "";
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    case catch ejabberd_odbc:sql_query(
			 jlib:nameprep(Server),
			 ["select password from users "
			  "where username='", Username, "';"]) of
		{selected, ["password"], [{Password}]} ->
		    Password;
		_ ->
		    ""
	    end
    end.

is_user_exists(User, Server) ->
    case jlib:nodeprep(User) of
	error ->
	    false;
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    case catch ejabberd_odbc:sql_query(
			 jlib:nameprep(Server),
			 ["select password from users "
			  "where username='", Username, "';"]) of
		{selected, ["password"], [{_Password}]} ->
		    true;
		_ ->
		    false
	    end
    end.

remove_user(User, Server) ->
    case jlib:nodeprep(User) of
	error ->
	    error;
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    catch ejabberd_odbc:sql_query(
		    jlib:nameprep(Server),
		    ["delete from users where username='", Username ,"';"]),
	    ejabberd_hooks:run(remove_user, jlib:nameprep(Server),
			       [User, Server])
    end.

remove_user(User, Server, Password) ->
    case jlib:nodeprep(User) of
	error ->
	    error;
	LUser ->
	    Username = ejabberd_odbc:escape(LUser),
	    Pass = ejabberd_odbc:escape(Password),
	    LServer = jlib:nameprep(Server),
	    F = fun() ->
			Result = ejabberd_odbc:sql_query_t(
				   ["select password from users where username='",
				    Username, "';"]),
			ejabberd_odbc:sql_query_t(["delete from users "
						   "where username='", Username,
						   "' and password='", Pass, "';"]),
			case Result of
			    {selected, ["password"], [{Password}]} ->
				ejabberd_hooks:run(remove_user, jlib:nameprep(Server),
						   [User, Server]),
				ok;
			    {selected, ["password"], []} ->
				not_exists;
			    _ ->
				not_allowed
			end
		end,
	    {atomic, Result } = ejabberd_odbc:transaction(LServer, F),
	    Result
    end.