#!/usr/bin/env bash
[[ -z "$1" ]] && echo "Usage: verify.sh <url>" && exit 1 

SIG=`mktemp`
RAW=`mktemp`

CONTENT=$(curl --silent "$1")

# Extract the signature
echo "$CONTENT" | awk '/-----BEGIN PGP SIGNATURE-----/{p=1};{if (p==1){a[NR]=$0}};/-----END PGP SIGNATURE-----/{for (i in a) print a[i]}' > "$SIG"
# "Re-create" the page content before the signing process
echo "$CONTENT" | awk '/-----BEGIN PGP SIGNATURE-----/{p=1;f=0};{if (p!=1){print $0}; if (p==1 && f==0) {print "%%%SIGNED_PAGES_PGP_SIGNATURE%%%"; f=1}};/-----END PGP SIGNATURE-----/{p=0}' > "$RAW"

GPG_OUT=`gpg --verify "$SIG" "$RAW"`
RET=$?
rm "$SIG" "$RAW"

exit "$RET"