1 files changed, 32 insertions, 0 deletions
diff --git a/acme-webserver b/acme-webserver
new file mode 100755
index 0000000..57ea789
--- /dev/null
+++ b/acme-webserver
@@ -0,0 +1,32 @@
+#!/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';