#!/usr/bin/perl
use strict;
use warnings;

use Data::Dumper;
use MIME::Base64;

my $headers = {};
my $last_key;

while (my $line = <STDIN>) {
	# stop parsing once we reach the body
	last if $line =~ /^$/;

	if ($line =~ /^(?<key>[^:]+): (?<value>.*)$/) {
		$last_key = lc($+{key});
		$headers->{$last_key} = $+{value};
	} elsif (defined($last_key) && $line =~ /^\s+(?<value>.*)$/) {
		$headers->{$last_key} .= $+{value};
	}
}

my $autocrypt = {split(/=|;\s*/, $headers->{autocrypt})};
my $keydata = decode_base64($autocrypt->{keydata});
open my $gpg, '|-', qw(gpg --import);
print $gpg $keydata;
close $gpg;