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|
package Dancer2::Handler::File;
# ABSTRACT: class for handling file content rendering
$Dancer2::Handler::File::VERSION = '1.0.0';
use Carp 'croak';
use Moo;
use HTTP::Date;
use Dancer2::FileUtils 'path', 'open_file', 'read_glob_content';
use Dancer2::Core::MIME;
use Dancer2::Core::Types;
use File::Spec;
with qw<
Dancer2::Core::Role::Handler
Dancer2::Core::Role::StandardResponses
Dancer2::Core::Role::Hookable
>;
sub hook_aliases {
{
before_file_render => 'handler.file.before_render',
after_file_render => 'handler.file.after_render',
}
}
sub supported_hooks { values %{ shift->hook_aliases } }
has mime => (
is => 'ro',
isa => InstanceOf ['Dancer2::Core::MIME'],
default => sub { Dancer2::Core::MIME->new },
);
has encoding => (
is => 'ro',
default => sub {'utf-8'},
);
has public_dir => (
is => 'ro',
lazy => 1,
builder => '_build_public_dir',
);
has regexp => (
is => 'ro',
default => sub {'/**'},
);
sub _build_public_dir {
my $self = shift;
return $self->app->config->{public_dir}
|| $ENV{DANCER_PUBLIC}
|| path( $self->app->location, 'public' );
}
sub register {
my ( $self, $app ) = @_;
# don't register the handler if no valid public dir
return if !-d $self->public_dir;
$app->add_route(
method => $_,
regexp => $self->regexp,
code => $self->code( $app->prefix ),
) for $self->methods;
}
sub methods { ( 'head', 'get' ) }
sub code {
my ( $self, $prefix ) = @_;
sub {
my $app = shift;
my $prefix = shift;
my $path = $app->request->path_info;
if ( $path =~ /\0/ ) {
return $self->standard_response( $app, 400 );
}
if ( $prefix && $prefix ne '/' ) {
$path =~ s/^\Q$prefix\E//;
}
my $file_path = $self->merge_paths( $path, $self->public_dir );
return $self->standard_response( $app, 403 ) if !defined $file_path;
if ( !-f $file_path ) {
$app->response->has_passed(1);
return;
}
if ( !-r $file_path ) {
return $self->standard_response( $app, 403 );
}
# Now we are sure we can render the file...
$self->execute_hook( 'handler.file.before_render', $file_path );
# Read file content as bytes
my $fh = open_file( "<", $file_path );
binmode $fh;
my $content = read_glob_content($fh);
# Assume m/^text/ mime types are correctly encoded
my $content_type = $self->mime->for_file($file_path) || 'text/plain';
if ( $content_type =~ m!^text/! ) {
$content_type .= "; charset=" . ( $self->encoding || "utf-8" );
}
my @stat = stat $file_path;
$app->response->header('Content-Type')
or $app->response->header( 'Content-Type', $content_type );
$app->response->header('Content-Length')
or $app->response->header( 'Content-Length', $stat[7] );
$app->response->header('Last-Modified')
or $app->response->header(
'Last-Modified',
HTTP::Date::time2str( $stat[9] )
);
$app->response->content($content);
$app->response->is_encoded(1); # bytes are already encoded
$self->execute_hook( 'handler.file.after_render', $app->response );
return ( $app->request->method eq 'GET' ) ? $content : '';
};
}
sub merge_paths {
my ( undef, $path, $public_dir ) = @_;
my ( $volume, $dirs, $file ) = File::Spec->splitpath( $path );
my @tokens = File::Spec->splitdir( "$dirs$file" );
my $updir = File::Spec->updir;
return if grep $_ eq $updir, @tokens;
my ( $pub_vol, $pub_dirs, $pub_file ) = File::Spec->splitpath( $public_dir );
my @pub_tokens = File::Spec->splitdir( "$pub_dirs$pub_file" );
return if length $volume and length $pub_vol and $volume ne $pub_vol;
my @final_vol = ( length $pub_vol ? $pub_vol : length $volume ? $volume : () );
my @file_path = ( @final_vol, @pub_tokens, @tokens );
my $file_path = path( @file_path );
return $file_path;
}
1;
__END__
=pod
=encoding UTF-8
=head1 NAME
Dancer2::Handler::File - class for handling file content rendering
=head1 VERSION
version 1.0.0
=head1 AUTHOR
Dancer Core Developers
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2023 by Alexis Sukrieh.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
|
