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| | # Copyright (C) 2016-2021 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# when no endpoints match, fallback to this and serve a static file
# or smart HTTP. This is our wrapper for git-http-backend(1)
package PublicInbox::GitHTTPBackend;
use strict;
use v5.10.1;
use Fcntl qw(:seek);
use IO::Handle; # ->flush
use HTTP::Date qw(time2str);
use PublicInbox::Qspawn;
use PublicInbox::Tmpfile;
use PublicInbox::WwwStatic qw(r @NO_CACHE);
use Carp ();
# 32 is same as the git-daemon connection limit
my $default_limiter = PublicInbox::Qspawn::Limiter->new(32);
# n.b. serving "description" and "cloneurl" should be innocuous enough to
# not cause problems. serving "config" might...
my @text = qw[HEAD info/refs info/attributes
objects/info/(?:http-alternates|alternates|packs)
cloneurl description];
my @binary = qw!
objects/[a-f0-9]{2}/[a-f0-9]{38}
objects/pack/pack-[a-f0-9]{40}\.(?:pack|idx)
!;
our $ANY = join('|', @binary, @text, 'git-upload-pack');
my $BIN = join('|', @binary);
my $TEXT = join('|', @text);
sub serve {
my ($env, $git, $path) = @_;
# Documentation/technical/http-protocol.txt in git.git
# requires one and exactly one query parameter:
if ($env->{QUERY_STRING} =~ /\Aservice=git-[A-Za-z0-9_]+-pack\z/ ||
$path =~ /\Agit-[A-Za-z0-9_]+-pack\z/) {
my $ok = serve_smart($env, $git, $path);
return $ok if $ok;
}
serve_dumb($env, $git, $path);
}
sub ucarp { Carp::carp(@_); undef }
my $prev = 0;
my $exp;
sub cache_one_year {
my ($h) = @_;
my $t = time + 31536000;
push @$h, 'Expires', $t == $prev ? $exp : ($exp = time2str($prev = $t)),
'Cache-Control', 'public, max-age=31536000';
}
sub serve_dumb {
my ($env, $git, $path) = @_;
my $h = [];
my $type;
if ($path =~ m!\Aobjects/[a-f0-9]{2}/[a-f0-9]{38}\z!) {
$type = 'application/x-git-loose-object';
cache_one_year($h);
} elsif ($path =~ m!\Aobjects/pack/pack-[a-f0-9]{40}\.pack\z!) {
$type = 'application/x-git-packed-objects';
cache_one_year($h);
} elsif ($path =~ m!\Aobjects/pack/pack-[a-f0-9]{40}\.idx\z!) {
$type = 'application/x-git-packed-objects-toc';
cache_one_year($h);
} elsif ($path =~ /\A(?:$TEXT)\z/o) {
$type = 'text/plain';
push @$h, @NO_CACHE;
} else {
return r(404);
}
$path = "$git->{git_dir}/$path";
PublicInbox::WwwStatic::response($env, $h, $path, $type);
}
sub git_parse_hdr { # {parse_hdr} for Qspawn
my ($r, $bref, $dumb_args) = @_;
my $res = parse_cgi_headers($r, $bref) or return; # incomplete
$res->[0] == 403 ? serve_dumb(@$dumb_args) : $res;
}
# returns undef if 403 so it falls back to dumb HTTP
sub serve_smart {
my ($env, $git, $path) = @_;
my %env = %ENV;
# GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL
# may be set in the server-process and are passed as-is
foreach my $name (qw(QUERY_STRING
REMOTE_USER REMOTE_ADDR
HTTP_CONTENT_ENCODING
HTTP_GIT_PROTOCOL
CONTENT_TYPE
SERVER_PROTOCOL
REQUEST_METHOD)) {
my $val = $env->{$name};
$env{$name} = $val if defined $val;
}
my $limiter = $git->{-httpbackend_limiter} || $default_limiter;
$env{GIT_HTTP_EXPORT_ALL} = '1';
$env{PATH_TRANSLATED} = "$git->{git_dir}/$path";
my $rdr = input_prepare($env) or return r(500);
my $qsp = PublicInbox::Qspawn->new([qw(git http-backend)], \%env, $rdr);
$qsp->psgi_return($env, $limiter, \&git_parse_hdr, [$env, $git, $path]);
}
sub input_prepare {
my ($env) = @_;
my $input = $env->{'psgi.input'};
my $fd = eval { fileno($input) };
return { 0 => $fd } if (defined $fd && $fd >= 0);
my $id = "git-http.input.$env->{REMOTE_ADDR}:$env->{REMOTE_PORT}";
my $in = tmpfile($id) // return ucarp("tmpfile: $!");
my $buf;
while (1) {
my $r = $input->read($buf, 8192) // return ucarp("read $!");
last if $r == 0;
print $in $buf // return ucarp("print: $!");
}
# ensure it's visible to git-http-backend(1):
$in->flush // return ucarp("flush: $!");
sysseek($in, 0, SEEK_SET) // return ucarp($env, "seek: $!");
{ 0 => $in };
}
sub parse_cgi_headers {
my ($r, $bref) = @_;
return r(500) unless defined $r && $r >= 0;
$$bref =~ s/\A(.*?)\r?\n\r?\n//s or return $r == 0 ? r(500) : undef;
my $h = $1;
my $code = 200;
my @h;
foreach my $l (split(/\r?\n/, $h)) {
my ($k, $v) = split(/:\s*/, $l, 2);
if ($k =~ /\AStatus\z/i) {
($code) = ($v =~ /\b([0-9]+)\b/);
} else {
push @h, $k, $v;
}
}
[ $code, \@h ]
}
1;
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