#!/usr/bin/perl

use warnings;
use strict;
use JSON;

# create-user.pl
#
# processes new user request files

my $working_dir = "./";
my $account_dir = $working_dir."req/";

my $conf_path = $working_dir."lyadmin.conf.json";
my $ul_path = $working_dir."user_list.txt";
my $SHELL_ENUM;

my @g;

# Given a username... prompts and creates that user
sub create($){
    my $id;
    
    my $fn1;

    my $username;
    my $shell_pref;
    my $user_email;
    my $pub_key;

    my $p0;

    # Prompts...
    $p0 = [
	"Enter username: ",
	"Enter pubkey: "
	];

    $fn1 = "";
    if($_[0]){
	$id = $_[0];
	$fn1 = $account_dir.$id.".ident";    
	open IN0, $fn1 or die "could not open file $fn1";
	$p0 = [ map("", @{$p0}) ];
    }else{
	*IN0 = *STDIN;
    }

    # read in username and validate
    printf($p0->[0]);
    $username = <IN0>;
    chomp $username;

    if(length($username) > 31 || !($username =~ /^[A-Za-z][A-Za-z0-9]+$/)){
	printf("%s is an INVALID username\n", $id);
	die ("oh no");
    }

    # read in email
    $user_email = $_[0] ?  <IN0> : "";
    chomp $user_email;

    # read in shell and validate
    {
	my $s0;
	$s0 = $_[0] ? <IN0> : "SHELL_KSH";
	chomp $s0;
	unless($SHELL_ENUM->{$s0}){
	    die "invalid shell setting $s0";
	}
	$shell_pref = $SHELL_ENUM->{$s0};
    }

    # read in pub key
    printf($p0->[1]);
    $pub_key = <IN0>;
    chomp $pub_key;

    {
	# Prompt to make sure the username looks OK
	my $cmd;
	$cmd = "useradd -m -s " . $shell_pref . " " . $username; 
	printf("Y/N is this command OK?: %s\n", $cmd);
	
	if(!(<STDIN> =~ /^y/i)){
	    die "invalid characters?!!";
	}

	# create the user
	system($cmd);
	system("echo '".$pub_key."' > /home/$username/.ssh/authorized_keys");
	system("chmod 711 /home/$username");
	system("test $fn1 && mv $fn1 $fn1.done");
	system("echo $username >> $ul_path");
    }
    close IN0;
}

# MAIN starts here

# Checks if user is root
if(!(`id` =~ /uid=0/)){
    die "please run this script as root";
}

# Adjusts the relative file paths based on where
# the script runs from
if(`pwd` =~ /perl-script\/?\s*$/){
    $working_dir = "../";
    $account_dir = $working_dir."req/";
    $conf_path = $working_dir."lyadmin.conf.json";
    $ul_path = $working_dir."user_list.txt";
    printf("%s\n", $conf_path);
}elsif(!(join(" ", glob("./*")) =~ /perl-script/)){
    $SHELL_ENUM = {"SHELL_KSH" => "/bin/ksh"};
    create(0);
    printf("admin user is now configured");
    printf("run the below command to continue the install");
    printf("pkg_add wget && wget 'https://git.lain.church/gashapwn/lyadmin/raw/branch/master/perl-script/provision.pl' -O - | perl");
    die "\n";
}

# Opens the conf file to read
# shell enums
open FILE, $conf_path or die "could not open file $conf_path";
{
    my $conf_str;
    my $conf_obj;
    local $/=undef;
    $conf_str = <FILE>;
    chomp $conf_str;
    $conf_obj = decode_json($conf_str);
    $SHELL_ENUM = $conf_obj->{"shell"};
};
close FILE;

# Saves all new user requests to an array
@g = glob("$account_dir*");
@g = map { s/.*\/([^\/]*).ident$/$1/; $_ } grep {$_ =~ /ident$/} @g;

# Iterate and create the users
for my $fn (@g){
    create($fn);
}