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@adactio adactio/sendWebmention.php
Last active Dec 27, 2018

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Search a web page for a webmention endpoint and, if one exists, send a webmention to it.
<?php
# Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
# http://creativecommons.org/publicdomain/zero/1.0/
function sendWebmention($source, $target) {
$endpoint = false;
$options = array(
CURLOPT_URL => $target,
CURLOPT_USERAGENT => 'adactio.com',
CURLOPT_RETURNTRANSFER => TRUE,
CURLOPT_HEADER => FALSE,
);
$curl = curl_init();
curl_setopt_array($curl, $options);
$body = curl_exec($curl);
curl_close($curl);
$dom = new \DOMDocument();
@$dom -> loadHTML($body);
$xpath = new \DOMXPath($dom);
foreach ($xpath -> query('//*[local-name(.) = "a" or local-name(.) = "link"][contains(@rel, "webmention")]') as $node) {
$endpoint = $node -> getAttribute("href");
break;
}
if (empty($endpoint)) {
return false;
}
if (!stristr($endpoint, '//')) {
$components = parse_url($target);
$domain = $components['scheme'].'://'.$components['host'];
if (substr($endpoint, 0, 1) == '/') {
$endpoint = $domain.$endpoint;
} elseif (stristr($endpoint, '../')) {
$path = $domain;
$nesting = substr_count($endpoint,'../');
$nesting++;
$directories = explode('/', $target);
for ($i = 1; $i < count($directories)-$nesting; $i++) {
if (substr($path,0,-1) != '/') {
$path.= '/';
}
$path.= $directories[$i];
}
if (substr($path,0,-1) != '/') {
$path.= '/';
}
$path.= $endpoint;
$path = str_replace('../','',$path);
$endpoint = $path;
} else {
$endpoint = $domain.'/'.$endpoint;
}
}
$data = array(
'source' => $source,
'target' => $target
);
$options = array(
CURLOPT_URL => $endpoint,
CURLOPT_USERAGENT => 'adactio.com',
CURLOPT_RETURNTRANSFER => TRUE,
CURLOPT_POST => TRUE,
CURLOPT_POSTFIELDS => $data,
CURLOPT_TIMEOUT => 20
);
$curl = curl_init();
curl_setopt_array($curl, $options);
$response = curl_exec($curl);
curl_close($curl);
return;
}
?>
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