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#!/usr/bin/perl -T
use strict;
use warnings;
my $ROOT = '/.well-known/acme-challenge';
$_ = <STDIN> // exit;
my $proto = s/ HTTP\/(1\.[01])\r\n\z// ? $1 : die "Error: Bad request\n";
my $method = s/\A(GET|HEAD) // ? $1 : die "Error: Bad request\n";
# Consume the headers (and ignore them)
while (defined (my $h = <STDIN>)) { last if $h eq "\r\n" };
my ($status_line, $content_type, $content);
if (/\A\Q$ROOT\E\/([A-Za-z0-9_-]+)\z/ and -f $1) {
if (open my $fh, '<', $1) {
($status_line, $content_type) = ('200 OK', 'application/jose+json');
$content = do { local $/ = undef; <$fh> };
close $fh;
}
else {
$status_line = '403 Forbidden';
}
}
print "HTTP/$proto ", ($status_line // '404 Not Found'), "\r\n";
print "Content-Type: $content_type\r\n" if defined $content_type;
print "Content-Length: ".length($content)."\r\n" if defined $content;
print "Connection: close\r\n";
print "\r\n";
print $content if defined $content and $method eq 'GET';
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