# Copyright (C) 2019-2020 all contributors
# License: AGPL-3.0+
# Standalone PSGI app to provide syntax highlighting as-a-service
# via "highlight" Perl module ("libhighlight-perl" in Debian).
#
# This allows exposing highlight as a persistent HTTP service for
# other scripts via HTTP PUT requests. PATH_INFO will be used
# as a hint for detecting the language for highlight.
#
# The following example using curl(1) will do the right thing
# regarding the file extension:
#
# curl -HExpect: -T /path/to/file http://example.com/
#
# You can also force a file extension by giving a path
# (in this case, "c") via:
#
# curl -HExpect: -T /path/to/file http://example.com/x.c
package PublicInbox::WwwHighlight;
use strict;
use warnings;
use bytes (); # only for bytes::length
use parent qw(PublicInbox::HlMod);
use PublicInbox::Linkify qw();
use PublicInbox::Hval qw(ascii_html);
use PublicInbox::WwwStatic qw(r);
# TODO: support highlight(1) for distros which don't package the
# SWIG extension. Also, there may be admins who don't want to
# have ugly SWIG-generated code in a long-lived Perl process.
# another slurp API hogging up all my memory :<
# This is capped by whatever the PSGI server allows,
# $ENV{GIT_HTTP_MAX_REQUEST_BUFFER} for PublicInbox::HTTP (10 MB)
sub read_in_full ($) {
my ($env) = @_;
my $in = $env->{'psgi.input'};
my $off = 0;
my $buf = '';
my $len = $env->{CONTENT_LENGTH} || 8192;
while (1) {
my $r = $in->read($buf, $len, $off);
last unless defined $r;
return \$buf if $r == 0;
$off += $r;
}
$env->{'psgi.errors'}->print("input read error: $!\n");
undef;
}
# entry point for PSGI
sub call {
my ($self, $env) = @_;
my $req_method = $env->{REQUEST_METHOD};
return r(405) if $req_method ne 'PUT';
my $bref = read_in_full($env) or return r(500);
my $l = PublicInbox::Linkify->new;
$l->linkify_1($$bref);
if (my $res = $self->do_hl($bref, $env->{PATH_INFO})) {
$bref = $res;
} else {
$$bref = ascii_html($$bref);
}
$l->linkify_2($$bref);
my $h = [ 'Content-Type', 'text/html; charset=UTF-8' ];
push @$h, 'Content-Length', bytes::length($$bref);
[ 200, $h, [ $$bref ] ]
}
1;