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- #! /usr/bin/perl -w
- # Copyright (C) 2019 Alex Schroeder <alex@gnu.org>
- #
- # This program is free software; you can redistribute it and/or modify
- # it under the terms of the GNU General Public License as published by
- # the Free Software Foundation; either version 3 of the License, or
- # (at your option) any later version.
- #
- # This program is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU General Public License for more details.
- #
- # You should have received a copy of the GNU General Public License
- # along with this program. If not, see <http://www.gnu.org/licenses/>.
- =head1 Webmention from one site to another
- If you link from page A on your site to page B on some other site, you can
- invoke this script with the command-line arguments A and B. In theory, this will
- create a link back from B to A, letting them and all their visitors know that
- you wrote something in response.
- =cut
- use Modern::Perl;
- use XML::LibXML;
- use LWP::UserAgent;
- use Data::Dumper;
- if (@ARGV != 2) {
- die "Usage: webmention FROM TO\n";
- }
- my $parser = XML::LibXML->new(recover => 2);
- my ($from, $to) = @ARGV;
- my $ua = LWP::UserAgent->new(agent => "Oddmuse Webmention Client/0.1");
- print "Getting $from\n";
- my $response = $ua->get($from);
- if (!$response->is_success) {
- die $response->status_line;
- }
- print "Parsing $from\n";
- my ($username, $homepage);
- my $dom = $parser->load_html(string => $response->decoded_content);
- my @nodes = $dom->findnodes('//*[@rel="author"]');
- if (@nodes) {
- my $node = shift @nodes;
- $username = $node->textContent;
- $homepage = $node->getAttribute('href');
- }
- print "Webmention from " . join(", ", $username, $homepage) . "\n"
- if $username or $homepage;
- print "Getting $to\n";
- $response = $ua->get($to);
- if (!$response->is_success) {
- die $response->status_line;
- }
- print "Parsing $to\n";
- $dom = $parser->load_html(string => $response->decoded_content);
- my $webmention = $dom->findvalue('//link[@rel="webmention"]/@href');
- if (!$webmention) {
- die "Webmention URL not found in $to\n";
- }
- print "Webmention URL is $webmention\n";
- $response = $ua->post($webmention, { source => $from, target => $to });
- my $message = $response->code . " " . $response->message . "\n";
- if ($response->is_success) {
- print $message;
- } else {
- die $message;
- }
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