#!/usr/bin/perl -wT
#
# get-list: A script to return a requested list
#
# Copyright (c) 2004 by Ian Hickson
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

use strict; # be anal about stuff
use CGI; # oh yeah, this is a CGI script
use Digest::MD5; # allow us to safely encode user-given data
use Fcntl ':flock'; # import LOCK_* constants

local $ENV{PATH} = '';

my $query = CGI->new();
my $id = $query->param('id');
my $key = $query->param('key');

if (defined($id) and defined($key)) {
    my $md5 = Digest::MD5->new;
    $md5->add($id);
    $md5->add('.');
    $md5->add($key);
    my $filename = '.data/'.($md5->hexdigest);
    open(my $lock, '+<', '.lock') or die $!;
    flock($lock, LOCK_EX);
    if (-f $filename) {
        print "Content-Type: application/xml\n\n";
        print `/bin/cat $filename`;
    } else {
        print "Status: 403 Forbidden\nContent-Type: text/plain\n\nInvalid id or key.\n";
    }
    close($lock);
} else {
    print <<eof;
Status: 400 Bad Request
Content-Type: text/plain

This is a REST-based Web Service that accepts GET or POST queries.
It has two parameters:
   id       -- the ID of the list to return
   key      -- the password for that list
eof
}