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package LWP::Protocol::nntp; |
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# Implementation of the Network News Transfer Protocol (RFC 977) |
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use base qw(LWP::Protocol); |
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our $VERSION = '6.34'; |
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require HTTP::Response; |
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require HTTP::Status; |
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require Net::NNTP; |
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use strict; |
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sub request { |
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my ($self, $request, $proxy, $arg, $size, $timeout) = @_; |
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$size = 4096 unless $size; |
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# Check for proxy |
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if (defined $proxy) { |
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return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST, |
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'You can not proxy through NNTP'); |
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} |
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# Check that the scheme is as expected |
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my $url = $request->uri; |
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my $scheme = $url->scheme; |
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unless ($scheme eq 'news' || $scheme eq 'nntp') { |
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return HTTP::Response->new(HTTP::Status::RC_INTERNAL_SERVER_ERROR, |
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"LWP::Protocol::nntp::request called for '$scheme'"); |
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} |
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# check for a valid method |
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my $method = $request->method; |
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unless ($method eq 'GET' || $method eq 'HEAD' || $method eq 'POST') { |
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return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST, |
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'Library does not allow method ' . "$method for '$scheme:' URLs"); |
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} |
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# extract the identifier and check against posting to an article |
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my $groupart = $url->_group; |
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my $is_art = $groupart =~ /@/; |
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if ($is_art && $method eq 'POST') { |
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return HTTP::Response->new(HTTP::Status::RC_BAD_REQUEST, |
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"Can't post to an article <$groupart>"); |
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} |
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my $nntp = Net::NNTP->new( |
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$url->host, |
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#Port => 18574, |
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Timeout => $timeout, |
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#Debug => 1, |
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); |
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die "Can't connect to nntp server" unless $nntp; |
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# Check the initial welcome message from the NNTP server |
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if ($nntp->status != 2) { |
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return HTTP::Response->new(HTTP::Status::RC_SERVICE_UNAVAILABLE, |
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$nntp->message); |
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} |
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my $response = HTTP::Response->new(HTTP::Status::RC_OK, "OK"); |
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my $mess = $nntp->message; |
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# Try to extract server name from greeting message. |
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# Don't know if this works well for a large class of servers, but |
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# this works for our server. |
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$mess =~ s/\s+ready\b.*//; |
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$mess =~ s/^\S+\s+//; |
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$response->header(Server => $mess); |
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# First we handle posting of articles |
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if ($method eq 'POST') { |
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$nntp->quit; |
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$nntp = undef; |
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$response->code(HTTP::Status::RC_NOT_IMPLEMENTED); |
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$response->message("POST not implemented yet"); |
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return $response; |
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} |
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# The method must be "GET" or "HEAD" by now |
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if (!$is_art) { |
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if (!$nntp->group($groupart)) { |
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$response->code(HTTP::Status::RC_NOT_FOUND); |
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$response->message($nntp->message); |
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} |
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$nntp->quit; |
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$nntp = undef; |
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# HEAD: just check if the group exists |
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if ($method eq 'GET' && $response->is_success) { |
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$response->code(HTTP::Status::RC_NOT_IMPLEMENTED); |
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$response->message("GET newsgroup not implemented yet"); |
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} |
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return $response; |
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} |
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# Send command to server to retrieve an article (or just the headers) |
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my $get = $method eq 'HEAD' ? "head" : "article"; |
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my $art = $nntp->$get("<$groupart>"); |
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unless ($art) { |
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$nntp->quit; |
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$response->code(HTTP::Status::RC_NOT_FOUND); |
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$response->message($nntp->message); |
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$nntp = undef; |
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return $response; |
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} |
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# Parse headers |
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my ($key, $val); |
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local $_; |
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while ($_ = shift @$art) { |
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if (/^\s+$/) { |
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last; # end of headers |
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} |
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elsif (/^(\S+):\s*(.*)/) { |
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$response->push_header($key, $val) if $key; |
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($key, $val) = ($1, $2); |
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} |
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elsif (/^\s+(.*)/) { |
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next unless $key; |
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$val .= $1; |
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} |
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else { |
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unshift(@$art, $_); |
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last; |
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} |
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} |
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$response->push_header($key, $val) if $key; |
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# Ensure that there is a Content-Type header |
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$response->header("Content-Type", "text/plain") |
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unless $response->header("Content-Type"); |
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# Collect the body |
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$response = $self->collect_once($arg, $response, join("", @$art)) if @$art; |
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# Say goodbye to the server |
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$nntp->quit; |
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$nntp = undef; |
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$response; |
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} |
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1; |