/usr/share/perl5/Plack/Middleware/ErrorDocument.pm is in libplack-perl 1.0033-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | package Plack::Middleware::ErrorDocument;
use strict;
use warnings;
use parent qw(Plack::Middleware);
use Plack::MIME;
use Plack::Util;
use Plack::Util::Accessor qw( subrequest );
use HTTP::Status qw(is_error);
sub call {
my $self = shift;
my $env = shift;
my $r = $self->app->($env);
$self->response_cb($r, sub {
my $r = shift;
unless (is_error($r->[0]) && exists $self->{$r->[0]}) {
return;
}
my $path = $self->{$r->[0]};
if ($self->subrequest) {
for my $key (keys %$env) {
unless ($key =~ /^psgi/) {
$env->{'psgix.errordocument.' . $key} = $env->{$key};
}
}
# TODO: What if SCRIPT_NAME is not empty?
$env->{REQUEST_METHOD} = 'GET';
$env->{REQUEST_URI} = $path;
$env->{PATH_INFO} = $path;
$env->{QUERY_STRING} = '';
delete $env->{CONTENT_LENGTH};
my $sub_r = $self->app->($env);
if ($sub_r->[0] == 200) {
$r->[1] = $sub_r->[1];
if (@$r == 3) {
$r->[2] = $sub_r->[2];
}
else {
my $full_sub_response = '';
Plack::Util::foreach($sub_r->[2], sub {
$full_sub_response .= $_[0];
});
my $returned;
return sub {
if ($returned) {
return defined($_[0]) ? '' : undef;
}
$returned = 1;
return $full_sub_response;
}
}
}
# TODO: allow 302 here?
} else {
my $h = Plack::Util::headers($r->[1]);
$h->remove('Content-Length');
$h->remove('Content-Encoding');
$h->remove('Transfer-Encoding');
$h->set('Content-Type', Plack::MIME->mime_type($path));
open my $fh, "<", $path or die "$path: $!";
if ($r->[2]) {
$r->[2] = $fh;
} else {
my $done;
return sub {
unless ($done) {
$done = 1;
return join '', <$fh>;
}
return defined $_[0] ? '' : undef;
};
};
}
});
}
1;
__END__
=head1 NAME
Plack::Middleware::ErrorDocument - Set Error Document based on HTTP status code
=head1 SYNOPSIS
# in app.psgi
use Plack::Builder;
builder {
enable "Plack::Middleware::ErrorDocument",
500 => '/uri/errors/500.html', 404 => '/uri/errors/404.html',
subrequest => 1;
$app;
};
=head1 DESCRIPTION
Plack::Middleware::ErrorDocument allows you to customize error screen
by setting paths (file system path or URI path) of error pages per
status code.
=head1 CONFIGURATIONS
=over 4
=item subrequest
A boolean flag to serve error pages using a new GET sub request.
Defaults to false, which means it serves error pages using file
system path.
builder {
enable "Plack::Middleware::ErrorDocument",
502 => '/home/www/htdocs/errors/maint.html';
enable "Plack::Middleware::ErrorDocument",
404 => '/static/404.html', 403 => '/static/403.html', subrequest => 1;
$app;
};
This configuration serves 502 error pages from file system directly
assuming that's when you probably maintain database etc. but serves
404 and 403 pages using a sub request so your application can do some
logic there like logging or doing suggestions.
When using a subrequest, the subrequest should return a regular '200' response.
=back
=head1 AUTHOR
Tatsuhiko Miyagawa
=head1 SEE ALSO
=cut
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