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Edit File : nntp.pm \| Size : 4.10 KB
package LWP::Protocol::nntp; # Implementation of the Network News Transfer Protocol (RFC 977) use parent qw(LWP::Protocol); our $VERSION = '6.76'; require HTTP::Response; require HTTP::Status; require Net::NNTP; use strict; sub request { my ($self, $request, $proxy, $arg, $size, $timeout) = @_; $size = 4096 unless $size; # Check for proxy if (defined $proxy) { return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST, 'You can not proxy through NNTP'); } # Check that the scheme is as expected my $url = $request->uri; my $scheme = $url->scheme; unless ($scheme eq 'news' \|\| $scheme eq 'nntp') { return HTTP::Response->new(HTTP::Status::RC_INTERNAL_SERVER_ERROR, "LWP::Protocol::nntp::request called for '$scheme'"); } # check for a valid method my $method = $request->method; unless ($method eq 'GET' \|\| $method eq 'HEAD' \|\| $method eq 'POST') { return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST, 'Library does not allow method ' . "$method for '$scheme:' URLs"); } # extract the identifier and check against posting to an article my $groupart = $url->_group; my $is_art = $groupart =~ /@/; if ($is_art && $method eq 'POST') { return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST, "Can't post to an article <$groupart>"); } my $nntp = Net::NNTP->new( $url->host, #Port => 18574, Timeout => $timeout, #Debug => 1, ); die "Can't connect to nntp server" unless $nntp; # Check the initial welcome message from the NNTP server if ($nntp->status != 2) { return HTTP::Response->new(HTTP::Status::RC_SERVICE_UNAVAILABLE, $nntp->message); } my $response = HTTP::Response->new(HTTP::Status::RC_OK, "OK"); my $mess = $nntp->message; # Try to extract server name from greeting message. # Don't know if this works well for a large class of servers, but # this works for our server. $mess =~ s/\s+ready\b.//; $mess =~ s/^\S+\s+//; $response->header(Server => $mess); # First we handle posting of articles if ($method eq 'POST') { $nntp->quit; $nntp = undef; $response->code(HTTP::Status::RC_NOT_IMPLEMENTED); $response->message("POST not implemented yet"); return $response; } # The method must be "GET" or "HEAD" by now if (!$is_art) { if (!$nntp->group($groupart)) { $response->code(HTTP::Status::RC_NOT_FOUND); $response->message($nntp->message); } $nntp->quit; $nntp = undef; # HEAD: just check if the group exists if ($method eq 'GET' && $response->is_success) { $response->code(HTTP::Status::RC_NOT_IMPLEMENTED); $response->message("GET newsgroup not implemented yet"); } return $response; } # Send command to server to retrieve an article (or just the headers) my $get = $method eq 'HEAD' ? "head" : "article"; my $art = $nntp->$get("<$groupart>"); unless ($art) { $nntp->quit; $response->code(HTTP::Status::RC_NOT_FOUND); $response->message($nntp->message); $nntp = undef; return $response; } # Parse headers my ($key, $val); local $_; while ($_ = shift @$art) { if (/^\s+$/) { last; # end of headers } elsif (/^(\S+):\s(.)/) { $response->push_header($key, $val) if $key; ($key, $val) = ($1, $2); } elsif (/^\s+(.)/) { next unless $key; $val .= $1; } else { unshift(@$art, $_); last; } } $response->push_header($key, $val) if $key; # Ensure that there is a Content-Type header $response->header("Content-Type", "text/plain") unless $response->header("Content-Type"); # Collect the body $response = $self->collect_once($arg, $response, join("", @$art)) if @$art; # Say goodbye to the server $nntp->quit; $nntp = undef; $response; } 1; Back

Edit File : nntp.pm | Size : 4.10 KB

package LWP::Protocol::nntp;

# Implementation of the Network News Transfer Protocol (RFC 977)

use parent qw(LWP::Protocol);

our $VERSION = '6.76';

require HTTP::Response;
require HTTP::Status;
require Net::NNTP;

use strict;

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

$size = 4096 unless $size;

# Check for proxy
    if (defined $proxy) {
        return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST,
            'You can not proxy through NNTP');
    }

# Check that the scheme is as expected
    my $url    = $request->uri;
    my $scheme = $url->scheme;
    unless ($scheme eq 'news' || $scheme eq 'nntp') {
        return HTTP::Response->new(HTTP::Status::RC_INTERNAL_SERVER_ERROR,
            "LWP::Protocol::nntp::request called for '$scheme'");
    }

# check for a valid method
    my $method = $request->method;
    unless ($method eq 'GET' || $method eq 'HEAD' || $method eq 'POST') {
        return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST,
            'Library does not allow method ' . "$method for '$scheme:' URLs");
    }

# extract the identifier and check against posting to an article
    my $groupart = $url->_group;
    my $is_art   = $groupart =~ /@/;

if ($is_art && $method eq 'POST') {
        return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST,
            "Can't post to an article <$groupart>");
    }

my $nntp = Net::NNTP->new(
        $url->host,

#Port    => 18574,
        Timeout => $timeout,

#Debug   => 1,
    );
    die "Can't connect to nntp server" unless $nntp;

# Check the initial welcome message from the NNTP server
    if ($nntp->status != 2) {
        return HTTP::Response->new(HTTP::Status::RC_SERVICE_UNAVAILABLE,
            $nntp->message);
    }
    my $response = HTTP::Response->new(HTTP::Status::RC_OK, "OK");

my $mess = $nntp->message;

# Try to extract server name from greeting message.
    # Don't know if this works well for a large class of servers, but
    # this works for our server.
    $mess =~ s/\s+ready\b.*//;
    $mess =~ s/^\S+\s+//;
    $response->header(Server => $mess);

# First we handle posting of articles
    if ($method eq 'POST') {
        $nntp->quit;
        $nntp = undef;
        $response->code(HTTP::Status::RC_NOT_IMPLEMENTED);
        $response->message("POST not implemented yet");
        return $response;
    }

# The method must be "GET" or "HEAD" by now
    if (!$is_art) {
        if (!$nntp->group($groupart)) {
            $response->code(HTTP::Status::RC_NOT_FOUND);
            $response->message($nntp->message);
        }
        $nntp->quit;
        $nntp = undef;

# HEAD: just check if the group exists
        if ($method eq 'GET' && $response->is_success) {
            $response->code(HTTP::Status::RC_NOT_IMPLEMENTED);
            $response->message("GET newsgroup not implemented yet");
        }
        return $response;
    }

# Send command to server to retrieve an article (or just the headers)
    my $get = $method eq 'HEAD' ? "head" : "article";
    my $art = $nntp->$get("<$groupart>");
    unless ($art) {
        $nntp->quit;
        $response->code(HTTP::Status::RC_NOT_FOUND);
        $response->message($nntp->message);
        $nntp = undef;
        return $response;
    }

# Parse headers
    my ($key, $val);
    local $_;
    while ($_ = shift @$art) {
        if (/^\s+$/) {
            last;    # end of headers
        }
        elsif (/^(\S+):\s*(.*)/) {
            $response->push_header($key, $val) if $key;
            ($key, $val) = ($1, $2);
        }
        elsif (/^\s+(.*)/) {
            next unless $key;
            $val .= $1;
        }
        else {
            unshift(@$art, $_);
            last;
        }
    }
    $response->push_header($key, $val) if $key;

# Ensure that there is a Content-Type header
    $response->header("Content-Type", "text/plain")
        unless $response->header("Content-Type");

# Collect the body
    $response = $self->collect_once($arg, $response, join("", @$art)) if @$art;

# Say goodbye to the server
    $nntp->quit;
    $nntp = undef;

$response;
}

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