package LWP::Protocol::cpan;
use strict;
use vars qw(@ISA);
require LWP::Protocol;
@ISA = qw(LWP::Protocol);
require URI;
require HTTP::Status;
require HTTP::Response;
our $CPAN;
unless ($CPAN) {
    # Try to find local CPAN mirror via $CPAN::Config
    eval {
        require CPAN::Config;
        if($CPAN::Config) {
            my $urls = $CPAN::Config->{urllist};
            if (ref($urls) eq "ARRAY") {
                my $file;
                for (@$urls) {
                    if (/^file:/) {
                        $file = $_;
                        last;
                    }
                }
                if ($file) {
                    $CPAN = $file;
                }
                else {
                    $CPAN = $urls->[0];
                }
            }
        }
    };
    $CPAN ||= "http://cpan.org/";  # last resort
}
# ensure that we don't chop of last part
$CPAN .= "/" unless $CPAN =~ m,/$,;
sub request {
    my($self, $request, $proxy, $arg, $size) = @_;
    # check proxy
    if (defined $proxy)
    {
        return HTTP::Response->new(&HTTP::Status::RC_BAD_REQUEST,
                                   'You can not proxy with cpan');
    }
    # check method
    my $method = $request->method;
    unless ($method eq 'GET' || $method eq 'HEAD') {
        return HTTP::Response->new(&HTTP::Status::RC_BAD_REQUEST,
                                   'Library does not allow method ' .
                                   "$method for 'cpan:' URLs");
    }
    my $path = $request->uri->path;
    $path =~ s,^/,,;
    my $response = HTTP::Response->new(&HTTP::Status::RC_FOUND);
    $response->header("Location" => URI->new_abs($path, $CPAN));
    $response;
}
1;