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gitweb: fix UTF-8 encoding when using CGI::Fast 

FCGI streams are implemented using the older stream API: TIEHANDLE,
therefore applying PerlIO layers using binmode() has no effect to them.
The solution in this patch is to redefine the FCGI::Stream::PRINT function
to use UTF-8 as output encoding, except within git_blob_plain() and git_snapshot()
which must still output in raw binary mode.

This problem and solution were previously reported back in 2012:
- http://git.661346.n2.nabble.com/Gitweb-running-as-FCGI-does-not-print-its-output-in-UTF-8-td7573415.html
- http://stackoverflow.com/questions/5005104

Signed-off-by: Julien Moutinho <julm+git@sourcephile.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Julien Moutinho 2020-03-29 01:20:28 +01:00 committed by Junio C Hamano
parent 0822e66b5d
commit 2ecfcdecc6
1 changed files with 16 additions and 0 deletions
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16
gitweb/gitweb.perl
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@ -1291,9 +1291,23 @@ sub run_request {
our ($pre_dispatch_hook, $post_dispatch_hook, $pre_listen_hook);
our $CGI = 'CGI';
our $cgi;
our $FCGI_Stream_PRINT_raw = \&FCGI::Stream::PRINT;
sub configure_as_fcgi {
require CGI::Fast;
our $CGI = 'CGI::Fast';
# FCGI is not Unicode aware hence the UTF-8 encoding must be done manually.
# However no encoding must be done within git_blob_plain() and git_snapshot()
# which must still output in raw binary mode.
no warnings 'redefine';
my $enc = Encode::find_encoding('UTF-8');
*FCGI::Stream::PRINT = sub {
my @OUTPUT = @_;
for (my $i = 1; $i < @_; $i++) {
$OUTPUT[$i] = $enc->encode($_[$i], Encode::FB_CROAK|Encode::LEAVE_SRC);
}
@_ = @OUTPUT;
goto $FCGI_Stream_PRINT_raw;
};
my $request_number = 0;
# let each child service 100 requests
@ -7079,6 +7093,7 @@ sub git_blob_plain {
($sandbox ? 'attachment' : 'inline')
. '; filename="' . $save_as . '"');
local $/ = undef;
local *FCGI::Stream::PRINT = $FCGI_Stream_PRINT_raw;
binmode STDOUT, ':raw';
print <$fd>;
binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi
@ -7417,6 +7432,7 @@ sub git_snapshot {
open my $fd, "-|", $cmd
or die_error(500, "Execute git-archive failed");
local *FCGI::Stream::PRINT = $FCGI_Stream_PRINT_raw;
binmode STDOUT, ':raw';
print <$fd>;
binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi