#!/usr/bin/env bash
# Moves a generated mail from /tmp/ to a given folder
# File ownership is changed to the owner of the folder
# File permissions are changed to 644

set -e

exitusage() {
	echo $'\n' $@ $'\n' >&2
	echo "Usage:" >&2
	echo "   $0 <basefilename> <folder>" >&2
	exit 1
}

if [[ `id -u` != 0 ]]; then
	exitusage This script must be run as root or with sudo
fi
if [[ $# != 2 ]]; then
	exitusage Need two parameters
fi

if ! echo "$1" | grep -qG "^[A-Za-z0-9.]*$"; then
	exitusage SECURITY ERROR: Base file name can only contain alphanumerical characters
fi

basefilename=$1
target=$2

test -r /tmp/$basefilename || exitusage "Can't read file /tmp/$basefilename"
test -d $target || exitusage "$target is not a folder"

targetuid=`ls -dln $target | cut -d \  -f 3`
targetgid=`ls -dln $target | cut -d \  -f 4`

mv /tmp/$basefilename $target
chown $targetuid:$targetgid $target/$basefilename
chmod 644 $target/$basefilename