[PATCH (amend)] gitweb: More detailed error messages for snapshot format

[Jakub Narebski <jnareb@gmail.com>]

Improve error messages for snapshot format in git_snapshot:
distinguish between situation where snapshots are turned off, where
snapshot format ('sf') parameter is invalid, where given snapshot
format does not exist in %known_snapshot_formats hash, and where
gitweb was given unsupported snapshot format.

While at it, use first from all supported snapshots format as default,
if no snapshot format was provided.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
Matt McCutchen wrote:
> On 7/24/07, Jakub Narebski <jnareb@gmail.com> wrote:
> > Improve error messages for snapshot format in git_snapshot:
> > distinguish between situation where snapshots are turned off, where
> > snapshot format ('sf') parameter is invalid,
[...]
> I also noticed that the check for an "invalid" format requires that it
> contain at least one good character, not that it contain no bad
> characters, which was what I originally meant.  It would be nice to
> fix the check, or the check could even be removed altogether since
> gitweb refuses any format that isn't in %known_snapshot_formats .  (I
> think I was misguidedly paranoid to add it in the first place.)

This fixes the check (although perhaps the check should be removed).

 gitweb/gitweb.perl |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index fdfce31..0acd0ca 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -4317,9 +4317,16 @@ sub git_snapshot {
 	@supported_fmts = filter_snapshot_fmts(@supported_fmts);
 
 	my $format = $cgi->param('sf');
-	unless ($format =~ m/[a-z0-9]+/
-	        && exists($known_snapshot_formats{$format})
-	        && grep($_ eq $format, @supported_fmts)) {
+	if (!@supported_fmts) {
+		die_error('403 Permission denied', "Permission denied");
+	}
+	# default to first supported snapshot format
+	$format ||= $supported_fmts[0];
+	if ($format !~ m/^[a-z0-9]+$/) {
+		die_error(undef, "Invalid snapshot format parameter");
+	} elsif (!exists($known_snapshot_formats{$format})) {
+		die_error(undef, "Unknown snapshot format");
+	} elsif (!grep($_ eq $format, @supported_fmts)) {
 		die_error(undef, "Unsupported snapshot format");
 	}
 
-- 
1.5.2.4