#!/bin/sh

# Get a one-time password, or add a OTP secret to your pass-otp store.

# The assumption of this script is that all otp passwords are stored with the
# suffix `-otp`. This script automatically appends newly added otps as such.

# For OTP passwords to be generated properly, it is important for the local
# computer to have its time properly synced. This can be done with the command
# below which requires the package `ntp`.

ifinstalled pass pass-otp

dir="${PASSWORD_STORE_DIR}"

choice="$({ echo "🆕add" ; echo "🕙sync-time" ; ls ${dir}/*-otp.gpg ;} | sed "s/.*\///;s/-otp.gpg//" | dmenu -p "Pick a 2FA:")"

case $choice in
	🆕add )
		ifinstalled maim zbar xclip || exit 1

		temp="$dir/temp.png"
		otp="otp-test-script"
		trap 'shred -fu $temp; pass rm $otp' HUP INT QUIT TERM PWR EXIT

		notify-send "Scan the image." "Scan the OTP QR code."

		maim -s "$temp" || exit 1
		info="$(zbarimg -q "$temp")"
		info="${info#QR-Code:}"
		issuer="$(echo "$info" | grep -o "issuer=[A-z0-9]\+")"
		name="${issuer#issuer=}"

		if echo "$info" | pass otp insert "$otp"; then
			while true ; do
				export name="$(dmenu -p "Give this One Time Password a one-word name:")"
				echo "$name" | grep -q -- "^[A-z0-9-]\+$" && break
			done
			pass mv "$otp" "$name-otp"
			notify-send "Successfully added." "$name-otp has been created."
		else
			notify-send "No OTP data found." "Try to scan the image again more precisely."
		fi

		;;
	🕙sync-time )
		ifinstalled ntp || exit 1
		notify-send -u low "🕙 Synchronizing Time..." "Synching time with remote NTP servers..."
		updatedata="$(sudo ntpdate pool.ntp.org)" &&
		notify-send -u low "🕙 Synchronizing Time..." "Done. Time changed by ${updatedata#*offset }"
		;;
	*) pass otp -c ${choice}-otp ;;
esac
