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package Plack::Middleware::JSONP;
use strict;
use parent qw(Plack::Middleware);
use Plack::Util;
use URI::Escape ();
sub call {
my($self, $env) = @_;
my $res = $self->app->($env);
$self->response_cb($res, sub {
my $res = shift;
if (defined $res->[2] && ref $res->[2] eq 'ARRAY' && @{$res->[2]} == 1) {
my $h = Plack::Util::headers($res->[1]);
if ($h->get('Content-Type') =~ m!/(?:json|javascript)! &&
$env->{QUERY_STRING} =~ /(?:^|&)callback=([^&]+)/) {
# TODO: support callback params other than 'callback'
my $cb = URI::Escape::uri_unescape($1);
if ($cb =~ /^[\w\.\[\]]+$/) {
my $jsonp = "$cb($res->[2][0])";
$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 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.
This middleware only works with an application response with content
body set as a single element array ref and doesn't touch the response
otherwise.
=head1 AUTHOR
Tatsuhiko Miyagawa
=head1 SEE ALSO
L<Plack>
=cut
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