FM / Protocol

/usr/local/share/perl5/LWP/Protocol

Name	Size	Mode	Actions
cpan.pm	1380	0444	edit dl rm
data.pm	1252	0444	edit dl rm
file.pm	3833	0444	edit dl rm
ftp.pm	16817	0444	edit dl rm
GHTTP.pm	1766	0444	edit dl rm
gopher.pm	5751	0444	edit dl rm
http.pm	14905	0444	edit dl rm
https.pm	6549	0444	edit dl rm
loopback.pm	601	0444	edit dl rm
mailto.pm	4428	0444	edit dl rm
nntp.pm	3873	0444	edit dl rm
nogo.pm	630	0444	edit dl rm

Edit: /usr/local/share/perl5/LWP/Protocol/gopher.pm (5751B)

package LWP::Protocol::gopher;

# Implementation of the gopher protocol (RFC 1436)
#
# This code is based on 'wwwgopher.pl,v 0.10 1994/10/17 18:12:34 shelden'
# which in turn is a vastly modified version of Oscar's http'get()
# dated 28/3/94 in <ftp://cui.unige.ch/PUBLIC/oscar/scripts/http.pl>
# including contributions from Marc van Heyningen and Martijn Koster.

use strict;
use vars qw(@ISA);

require HTTP::Response;
require HTTP::Status;
require IO::Socket;
require IO::Select;

require LWP::Protocol;
@ISA = qw(LWP::Protocol);

my %gopher2mimetype = (
    '0' => 'text/plain',                # 0 file
    '1' => 'text/html',                 # 1 menu
					# 2 CSO phone-book server
					# 3 Error
    '4' => 'application/mac-binhex40',  # 4 BinHexed Macintosh file
    '5' => 'application/zip',           # 5 DOS binary archive of some sort
    '6' => 'application/octet-stream',  # 6 UNIX uuencoded file.
    '7' => 'text/html',                 # 7 Index-Search server
					# 8 telnet session
    '9' => 'application/octet-stream',  # 9 binary file
    'h' => 'text/html',                 # html
    'g' => 'image/gif',                 # gif
    'I' => 'image/*',                   # some kind of image
);

my %gopher2encoding = (
    '6' => 'x_uuencode',                # 6 UNIX uuencoded file.
);

sub request
{
    my($self, $request, $proxy, $arg, $size, $timeout) = @_;

$size = 4096 unless $size;

# check proxy
    if (defined $proxy) {
	return HTTP::Response->new(&HTTP::Status::RC_BAD_REQUEST,
				   'You can not proxy through the gopher');
    }

my $url = $request->uri;
    die "bad scheme" if $url->scheme ne 'gopher';

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 'gopher:' URLs");
    }

my $gophertype = $url->gopher_type;
    unless (exists $gopher2mimetype{$gophertype}) {
	return HTTP::Response->new(&HTTP::Status::RC_NOT_IMPLEMENTED,
				   'Library does not support gophertype ' .
				   $gophertype);
    }

my $response = HTTP::Response->new(&HTTP::Status::RC_OK, "OK");
    $response->header('Content-type' => $gopher2mimetype{$gophertype}
					|| 'text/plain');
    $response->header('Content-Encoding' => $gopher2encoding{$gophertype})
	if exists $gopher2encoding{$gophertype};

if ($method eq 'HEAD') {
	# XXX: don't even try it so we set this header
	$response->header('Client-Warning' => 'Client answer only');
	return $response;
    }
    
    if ($gophertype eq '7' && ! $url->search) {
      # the url is the prompt for a gopher search; supply boiler-plate
      return $self->collect_once($arg, $response, <<"EOT");
<HEAD>
<TITLE>Gopher Index</TITLE>
<ISINDEX>
</HEAD>
<BODY>
<H1>$url<BR>Gopher Search</H1>
This is a searchable Gopher index.
Use the search function of your browser to enter search terms.
</BODY>
EOT
    }

my $host = $url->host;
    my $port = $url->port;

my $requestLine = "";

my $selector = $url->selector;
    if (defined $selector) {
	$requestLine .= $selector;
	my $search = $url->search;
	if (defined $search) {
	    $requestLine .= "\t$search";
	    my $string = $url->string;
	    if (defined $string) {
		$requestLine .= "\t$string";
	    }
	}
    }
    $requestLine .= "\015\012";

# potential request headers are just ignored

# Ok, lets make the request
    my $socket = IO::Socket::INET->new(PeerAddr => $host,
				       PeerPort => $port,
				       LocalAddr => $self->{ua}{local_address},
				       Proto    => 'tcp',
				       Timeout  => $timeout);
    die "Can't connect to $host:$port" unless $socket;
    my $sel = IO::Select->new($socket);

{
	die "write timeout" if $timeout && !$sel->can_write($timeout);
	my $n = syswrite($socket, $requestLine, length($requestLine));
	die $! unless defined($n);
	die "short write" if $n != length($requestLine);
    }

my $user_arg = $arg;

# must handle menus in a special way since they are to be
    # converted to HTML.  Undefing $arg ensures that the user does
    # not see the data before we get a change to convert it.
    $arg = undef if $gophertype eq '1' || $gophertype eq '7';

# collect response
    my $buf = '';
    $response = $self->collect($arg, $response, sub {
	die "read timeout" if $timeout && !$sel->can_read($timeout);
        my $n = sysread($socket, $buf, $size);
	die $! unless defined($n);
	return \$buf;
      } );

# Convert menu to HTML and return data to user.
    if ($gophertype eq '1' || $gophertype eq '7') {
	my $content = menu2html($response->content);
	if (defined $user_arg) {
	    $response = $self->collect_once($user_arg, $response, $content);
	}
	else {
	    $response->content($content);
	}
    }

$response;
}

sub gopher2url
{
    my($gophertype, $path, $host, $port) = @_;

my $url;

if ($gophertype eq '8' || $gophertype eq 'T') {
	# telnet session
	$url = $HTTP::URI_CLASS->new($gophertype eq '8' ? 'telnet:':'tn3270:');
	$url->user($path) if defined $path;
    }
    else {
	$path = URI::Escape::uri_escape($path);
	$url = $HTTP::URI_CLASS->new("gopher:/$gophertype$path");
    }
    $url->host($host);
    $url->port($port);
    $url;
}

sub menu2html {
    my($menu) = @_;

$menu =~ s/\015//g;  # remove carriage return
    my $tmp = <<"EOT";
<HTML>
<HEAD>
   <TITLE>Gopher menu</TITLE>
</HEAD>
<BODY>
<H1>Gopher menu</H1>
EOT
    for (split("\n", $menu)) {
	last if /^\./;
	my($pretty, $path, $host, $port) = split("\t");

$pretty =~ s/^(.)//;
	my $type = $1;

my $url = gopher2url($type, $path, $host, $port)->as_string;
	$tmp .= qq{<A HREF="$url">$pretty</A><BR>\n};
    }
    $tmp .= "</BODY>\n</HTML>\n";
    $tmp;
}

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