# Copyright (C) 2019 all contributors # License: AGPL-3.0+ # show any VCS object, similar to "git show" # FIXME: we only show blobs for now # # This can use a "solver" to reconstruct blobs based on git # patches (with abbreviated OIDs in the header). However, the # abbreviated OIDs must match exactly what's in the original # email (unless a normal code repo already has the blob). # # In other words, we can only reliably reconstruct blobs based # on links generated by ViewDiff (and only if the emailed # patches apply 100% cleanly to published blobs). package PublicInbox::ViewVCS; use strict; use warnings; use bytes (); # only for bytes::length use PublicInbox::SolverGit; use PublicInbox::WwwStream; use PublicInbox::Linkify; use PublicInbox::Tmpfile; use PublicInbox::Hval qw(ascii_html to_filename); my $hl = eval { require PublicInbox::HlMod; PublicInbox::HlMod->new; }; my %QP_MAP = ( A => 'oid_a', B => 'oid_b', a => 'path_a', b => 'path_b' ); our $MAX_SIZE = 1024 * 1024; # TODO: configurable my $BIN_DETECT = 8000; # same as git sub html_i { # WwwStream::getline callback my ($nr, $ctx) = @_; $nr == 1 ? ${delete $ctx->{obuf}} : undef; } sub html_page ($$$) { my ($ctx, $code, $strref) = @_; my $wcb = delete $ctx->{-wcb}; $ctx->{-upfx} = '../../'; # from "/$INBOX/$OID/s/" $ctx->{obuf} = $strref; my $res = PublicInbox::WwwStream->response($ctx, $code, \&html_i); $wcb ? $wcb->($res) : $res; } sub stream_blob_parse_hdr { # {parse_hdr} for Qspawn my ($r, $bref, $ctx) = @_; my ($res, $logref) = delete @$ctx{qw(-res -logref)}; my ($git, $oid, $type, $size, $di) = @$res; my @cl = ('Content-Length', $size); if (!defined $r) { # error html_page($ctx, 500, $logref); } elsif (index($$bref, "\0") >= 0) { [200, [qw(Content-Type application/octet-stream), @cl] ]; } else { my $n = bytes::length($$bref); if ($n >= $BIN_DETECT || $n == $size) { return [200, [ 'Content-Type', 'text/plain; charset=UTF-8', @cl ] ]; } if ($r == 0) { warn "premature EOF on $oid $$logref\n"; return html_page($ctx, 500, $logref); } undef; # bref keeps growing } } sub stream_large_blob ($$$$) { my ($ctx, $res, $logref, $fn) = @_; $ctx->{-logref} = $logref; $ctx->{-res} = $res; my ($git, $oid, $type, $size, $di) = @$res; my $cmd = ['git', "--git-dir=$git->{git_dir}", 'cat-file', $type, $oid]; my $qsp = PublicInbox::Qspawn->new($cmd); my $env = $ctx->{env}; $env->{'qspawn.wcb'} = delete $ctx->{-wcb}; $qsp->psgi_return($env, undef, \&stream_blob_parse_hdr, $ctx); } sub show_other_result ($$) { my ($bref, $ctx) = @_; my ($qsp, $logref) = delete @$ctx{qw(-qsp -logref)}; if (my $err = $qsp->{err}) { utf8::decode($$err); $$logref .= "git show error: $err"; return html_page($ctx, 500, $logref); } my $l = PublicInbox::Linkify->new; utf8::decode($$bref); $$bref = '
'. $l->to_html($$bref);
	$$bref .= '

' . $$logref; html_page($ctx, 200, $bref); } sub show_other ($$$$) { my ($ctx, $res, $logref, $fn) = @_; my ($git, $oid, $type, $size) = @$res; if ($size > $MAX_SIZE) { $$logref = "$oid is too big to show\n" . $$logref; return html_page($ctx, 200, $logref); } my $cmd = ['git', "--git-dir=$git->{git_dir}", qw(show --encoding=UTF-8 --no-color --no-abbrev), $oid ]; my $qsp = PublicInbox::Qspawn->new($cmd); my $env = $ctx->{env}; $ctx->{-qsp} = $qsp; $ctx->{-logref} = $logref; $qsp->psgi_qx($env, undef, \&show_other_result, $ctx); } # user_cb for SolverGit, called as: user_cb->($result_or_error, $uarg) sub solve_result { my ($res, $ctx) = @_; my ($log, $hints, $fn) = delete @$ctx{qw(log hints fn)}; unless (seek($log, 0, 0)) { $ctx->{env}->{'psgi.errors'}->print("seek(log): $!\n"); return html_page($ctx, 500, \'seek error'); } $log = do { local $/; <$log> }; my $ref = ref($res); my $l = PublicInbox::Linkify->new; $log = '
debug log:

' .
		$l->to_html($log) . '
'; $res or return html_page($ctx, 404, \$log); $ref eq 'ARRAY' or return html_page($ctx, 500, \$log); my ($git, $oid, $type, $size, $di) = @$res; return show_other($ctx, $res, \$log, $fn) if $type ne 'blob'; my $path = to_filename($di->{path_b} || $hints->{path_b} || 'blob'); my $raw_link = "(raw)"; if ($size > $MAX_SIZE) { return stream_large_blob($ctx, $res, \$log, $fn) if defined $fn; $log = "
Too big to show, download available\n" .
			"$oid $type $size bytes $raw_link
" . $log; return html_page($ctx, 200, \$log); } my $blob = $git->cat_file($oid); if (!$blob) { # WTF? my $e = "Failed to retrieve generated blob ($oid)"; $ctx->{env}->{'psgi.errors'}->print("$e ($git->{git_dir})\n"); $log = "
$e
" . $log; return html_page($ctx, 500, \$log); } my $bin = index(substr($$blob, 0, $BIN_DETECT), "\0") >= 0; if (defined $fn) { my $h = [ 'Content-Length', $size, 'Content-Type' ]; push(@$h, ($bin ? 'application/octet-stream' : 'text/plain')); return delete($ctx->{-wcb})->([200, $h, [ $$blob ]]); } if ($bin) { $log = "
$oid $type $size bytes (binary)" .
			" $raw_link
" . $log; return html_page($ctx, 200, \$log); } # TODO: detect + convert to ensure validity utf8::decode($$blob); my $nl = ($$blob =~ tr/\n/\n/); my $pad = length($nl); $l->linkify_1($$blob); my $ok = $hl->do_hl($blob, $path) if $hl; if ($ok) { $blob = $ok; } else { $$blob = ascii_html($$blob); } # using some of the same CSS class names and ids as cgit $log = "
$oid $type $size bytes $raw_link
" . "
". "
" . join('', map {
			sprintf("% ${pad}u\n", $_)
		} (1..$nl)) . '
' . '
 
'. # pad for non-CSS users "" . $l->linkify_2($$blob) . '' . $log; html_page($ctx, 200, \$log); } sub show ($$;$) { my ($ctx, $oid_b, $fn) = @_; my $qp = $ctx->{qp}; my $hints = $ctx->{hints} = {}; while (my ($from, $to) = each %QP_MAP) { defined(my $v = $qp->{$from}) or next; $hints->{$to} = $v; } $ctx->{'log'} = tmpfile("solve.$oid_b"); $ctx->{fn} = $fn; my $solver = PublicInbox::SolverGit->new($ctx->{-inbox}, \&solve_result, $ctx); # PSGI server will call this immediately and give us a callback (-wcb) sub { $ctx->{-wcb} = $_[0]; # HTTP write callback $solver->solve($ctx->{env}, $ctx->{log}, $oid_b, $hints); }; } 1;