source: main/trunk/greenstone2/perllib/cpan/LWP/Protocol/cpan.pm@ 27174

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;