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package Plack::Middleware::JSONP;
use strict;
use parent qw(Plack::Middleware);
use Plack::Util;
use URI::Escape ();
use Plack::Util::Accessor qw/callback_key/;
sub prepare_app {
my $self = shift;
unless (defined $self->callback_key) {
$self->callback_key('callback');
}
}
sub call {
my($self, $env) = @_;
my $res = $self->app->($env);
$self->response_cb($res, sub {
my $res = shift;
if (defined $res->[2]) {
my $h = Plack::Util::headers($res->[1]);
my $callback_key = $self->callback_key;
if ($h->get('Content-Type') =~ m!/(?:json|javascript)! &&
$env->{QUERY_STRING} =~ /(?:^|&)$callback_key=([^&]+)/) {
my $cb = URI::Escape::uri_unescape($1);
if ($cb =~ /^[\w\.\[\]]+$/) {
my $body;
Plack::Util::foreach($res->[2], sub { $body .= $_[0] });
my $jsonp = "$cb($body)";
$res->[2] = [ $jsonp ];
$h->set('Content-Length', length $jsonp);
$h->set('Content-Type', 'text/javascript');
}
}
}
});
}
1;
__END__
=head1 NAME
Plack::Middleware::JSONP - Wraps JSON response in JSONP if callback parameter is specified
=head1 SYNOPSIS
enable "JSONP", callback_key => 'jsonp';
=head1 DESCRIPTION
Plack::Middleware::JSONP wraps JSON response, which has Content-Type
value either C<text/javascript> or C<application/json> as a JSONP
response which is specified with the C<callback> query parameter. The
name of the parameter can be set while enabling the middleware.
This middleware only works with a non-streaming response, and doesn't
touch the response otherwise.
=head1 AUTHOR
Tatsuhiko Miyagawa
=head1 SEE ALSO
L<Plack>
=cut
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