#!/bin/bash

PASSWD_LIST=passwords.gpg
PASSWD_LIST_UNENCRYPTED=passwords
KEY_RECIPIENT_NAME="Ken Zhao"
EDITOR=vim

if [ ! -f $PASSWD_LIST ]; then
	echo "Password file $PASSWD_LIST doesn't exist!"
	exit 1
fi

# create our tempfile for our temporary password storage
TEMPFILE=`tempfile 2>/dev/null` || TEMPFILE=/tmp/`basename $0`.tmp

# we have to make sure that we delete our tempfile whatever way we exit
trap "rm -f $TEMPFILE" 0 1 2 5 15

# prompt the user for the password
dialog --backtitle "Password Locker" --title "Master Password" --clear --insecure --passwordbox "Enter the Password Locker master password." 10 51 2> $TEMPFILE

RETVAL=$?

case $RETVAL in
	1)
		echo "Authentication Required!";
		exit 1;;
	255)
		echo "Authentication Required!";
		exit 1;;
esac
		
# decrypt the password list
cat $TEMPFILE | gpg -d -r "$KEY_RECIPIENT_NAME" -o $PASSWD_LIST_UNENCRYPTED --passphrase-fd 0 $PASSWD_LIST &> /dev/null
RETVAL=$?

# if decryption succeeded, open the password list in vim
# and then re-encrypt it after vim closes
case $RETVAL in
	0)
		rm $PASSWD_LIST;
		$EDITOR $PASSWD_LIST_UNENCRYPTED 2> /dev/null;
		if gpg -e -r "$KEY_RECIPIENT_NAME" -o $PASSWD_LIST $PASSWD_LIST_UNENCRYPTED &> /dev/null; then
			rm $PASSWD_LIST_UNENCRYPTED;
		else
			echo "gpg failed to encrypt your password file! Please fix the problem manually!";
			exit 1;
		fi;;
	1|4)
		echo "Invalid Password!";
		exit 1;;
esac