File Coverage

blib/lib/Plack/Middleware/Precompressed.pm

Criterion	Covered	Total	%
statement	61	61	100.0
branch	24	26	92.3
condition	2	2	100.0
subroutine	11	11	100.0
pod	1	2	50.0
total	99	102	97.0

use 5.006;
use strict;
use warnings;

package Plack::Middleware::Precompressed;
$Plack::Middleware::Precompressed::VERSION = '1.103';
# ABSTRACT: serve pre-gzipped content to compression-enabled clients

use parent 'Plack::Middleware';

use Plack::Util::Accessor qw( match rules env_keys );
use Plack::MIME ();
use Plack::Util ();
use Array::RefElem ();

sub rewrite {
	my $self = shift;
	my ( $env ) = @_;
	my $rules = $self->rules;
	$rules ? $rules->( defined $env ? $env : () ) : ( $_ .= '.gz' );
}

sub call {
	my $self = shift;
	my ( $env ) = @_;

	my $encoding;
	my $path = $env->{'PATH_INFO'};
	my $have_match = $self->match ? $path =~ $self->match : 1;

	# the `deflate` encoding is unreliably messy so we won't support it
	# c.f. http://zoompf.com/2012/02/lose-the-wait-http-compression
	if ( $have_match ) {
		( $encoding ) =
			grep { $_ eq 'gzip' or $_ eq 'x-gzip' }
			map  { s!\s+!!g; split /,/, lc }
			grep { defined }
			$env->{'HTTP_ACCEPT_ENCODING'};
	}

	my $res = do {
		my $keys = $self->env_keys || [];
		local @$env{ 'PATH_INFO', @$keys } = ( $path, @$env{ @$keys } ) if $encoding;
		if ( $encoding ) {
			my %pass_env;
			Array::RefElem::hv_store %pass_env, $_, $env->{ $_ } for @$keys;
			$self->rewrite( \%pass_env ) for $env->{'PATH_INFO'};
		}
		delete local $env->{'HTTP_ACCEPT_ENCODING'} if $encoding;
		$self->app->( $env );
	};

	return $res unless $have_match;

	my $is_fail;
	my $final_res = Plack::Util::response_cb( $res, sub {
		my $res = shift;
		$is_fail = $res->[0] != 200;
		return if $is_fail;
		Plack::Util::header_push( $res->[1], 'Vary', 'Accept-Encoding' );
		if ( $encoding ) {
			my $mime = Plack::MIME->mime_type( $path );
			Plack::Util::header_set( $res->[1], 'Content-Type', $mime ) if $mime;
			Plack::Util::header_push( $res->[1], 'Content-Encoding', $encoding );
		}
		return;
	} );

	return $is_fail ? $self->app->( $env ) : $final_res;
}

1;

__END__