totp

#!/bin/bash
# Generate TOTP codes using oathtool
#
# Requires the "oathtool" package.
#
# To extract the base32 key out of a QR code, install the "zbar-tools"
# package and use "zbarimg qr.png".
#
# Then put all of the keys in the ~/.totp/ directory.
#
# based on https://superuser.com/questions/462478/is-there-a-google-authenticator-desktop-client/826339#826339

# Create the key directory if it doesn't exist
KEYDIR="$HOME/.totp"
if [ ! -e "$KEYDIR" ] ; then
        mkdir "$KEYDIR"
        chmod go-rwx "$KEYDIR"
fi

# Check the permissions on the .totp directory
if [ -z "$(find "$KEYDIR" -type d -perm 0700)" ]; then
        echo "The permissions of the $KEYDIR directory must be exactly 0700"
        exit 1
fi

if [ "z$1" = "z" ] ; then
        echo "Usage: $0 provider"
        exit 2
fi

PROVIDER="$1"
KEY="$KEYDIR/$PROVIDER"

if [ ! -r "$KEY" ] ; then
        echo "Key '$KEY' not found"
        exit 3
fi

CODE="$(/usr/bin/oathtool --totp --base32 "$(<"$KEY")")"
if [ "z$DISPLAY" != "z" ] ; then
        echo -n "$CODE" | xsel --clipboard
fi
echo "$CODE"