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|
#!/bin/bash
#
# Creates an OpenPGP fingerprint business card.
# This script uses an SVG file as a template and replaces
# values such as $NAME and $FINGERPRINT with contents extracted
# from a key.
#
# Note that this script uses "gpg --with-colons" to parse key information.
# Documentation on the returned format can be found in "doc/DETAILS"
# of the GnuPG distribution.
set -e
# Show help
print_usage() {
cat <<- EOF
makecard - Create business cards with GnuPG
$0 [-t template] gpgid
Print an SVG business card containing an OpenPGP fingerprint to standard output.
-t template
Use the file <template> as an SVG template for the business card.
gpgid
GnuPG id used on card. This may be anything accepted by gpg, such as an email address, key id or fingerprint.
EOF
}
# Parameters
#
# GPG key identity to use
GPGID=
# Template file in which to replace variables
TEMPLATE="multiple.svg"
# Process command-line parameters
while test $# -gt 0; do
case "$1" in
-h)
print_usage
exit 0
;;
-t)
shift
if [ $# -gt 0 ]; then
TEMPLATE=$1
else
echo "No template specified. Aborting." 1>&2
exit 1
fi
;;
*)
GPGID=$1
;;
esac
shift
done
# Parameters processed beyond this point
if [ -z "$GPGID" ]; then
echo "No gpg identity specified. Aborting." 1>&2
exit 1
fi
if [ ! -e "$TEMPLATE" ]; then
echo "Template not found. Aborting." 1>&2
exit 1
fi
# Compute number of keys available under given identity
NUMKEYS=$(gpg --with-colons --list-keys "$GPGID" | awk -F: '/^fpr/{ print $10 }' | wc -l)
# Only one key is supported by this script
if [ "$NUMKEYS" -eq 0 ]; then
echo "No keys found for $GPGID. Aborting." 1>&2
exit 1
fi
if [ "$NUMKEYS" -gt 1 ]; then
echo "More than one key found for $GPGID. Aborting." 1>&2;
exit 1
fi
# Extract name
USERID=$(gpg --with-colons --list-keys --fingerprint "$GPGID" | awk -F: '/^pub/{ print $10 }')
NAME=$(echo "$USERID"| awk -F' <' '{ print $1 }')
# Extract fingerprint
FINGERPRINT=$(gpg --with-colons --list-keys "$GPGID" | awk -F: '/^fpr/{ print $10 }')
# First 20 characters of fingerprint, separated intp groups of 4
FP1=$(echo "$FINGERPRINT" | cut -c1-20 | fold -w4 | paste -sd\ -)
# Second 20 characters of fingerprint, separated intp groups of 4
FP2=$(echo "$FINGERPRINT" | cut -c21-40 | fold -w4 | paste -sd\ -)
# Data to include in QR code
# Remove "options=mr" from URL query to get human-readable output
QRDATA="https://pgp.mit.edu/pks/lookup?op=get&options=mr&search=0x$FINGERPRINT"
# Encode QR code
QRCODE="data:image/png;base64,$(echo "$QRDATA" | qrencode -t PNG -m 0 -o - | base64)"
# Replace variables in tamplate
cat "$TEMPLATE" \
| sed "s/\$NAME/$NAME/g" \
| sed "s/\$FP1/$FP1/g" \
| sed "s/\$FP2/$FP2/g" \
| awk -v QRCODE="$QRCODE" '{ gsub(/\$QRCODE/, QRCODE); print }'
|
