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<?php
namespace Zotlabs\Lib;
/**
* @brief Fetch and return a webfinger for a resource
*
* @param string $resource - The resource
* @return boolean|string false or associative array from result JSON
*/
class Webfinger {
static private $server = EMPTY_STR;
static private $resource = EMPTY_STR;
static function exec($resource) {
if(! $resource) {
return false;
}
self::parse_resource($resource);
if(! ( self::$server && self::$resource)) {
return false;
}
if(! check_siteallowed(self::$server)) {
logger('blacklisted: ' . self::$server);
return false;
}
btlogger('fetching resource: ' . self::$resource . ' from ' . self::$server, LOGGER_DEBUG, LOG_INFO);
$url = 'https://' . self::$server . '/.well-known/webfinger?f=&resource=' . self::$resource ;
$counter = 0;
$s = z_fetch_url($url, false, $counter, [ 'headers' => [ 'Accept: application/jrd+json, */*' ] ]);
if($s['success']) {
$j = json_decode($s['body'], true);
return($j);
}
return false;
}
static function parse_resource($resource) {
self::$resource = urlencode($resource);
if(strpos($resource,'http') === 0) {
$m = parse_url($resource);
if($m) {
if($m['scheme'] !== 'https') {
return false;
}
self::$server = $m['host'] . ((isset($m['port'])) ? ':' . $m['port'] : '');
}
else {
return false;
}
}
elseif(strpos($resource,'tag:') === 0) {
$arr = explode(':',$resource); // split the tag
$h = explode(',',$arr[1]); // split the host,date
self::$server = $h[0];
}
else {
$x = explode('@',$resource);
$username = $x[0];
if(count($x) > 1) {
self::$server = $x[1];
}
else {
return false;
}
if(strpos($resource,'acct:') !== 0) {
self::$resource = urlencode('acct:' . $resource);
}
}
}
/**
* @brief fetch a webfinger resource and return a zot6 discovery url if present
*
*/
static function zot_url($resource) {
$arr = self::exec($resource);
if(is_array($arr) && array_key_exists('links',$arr)) {
foreach($arr['links'] as $link) {
if(array_key_exists('rel',$link) && $link['rel'] === PROTOCOL_ZOT6) {
if(array_key_exists('href',$link) && $link['href'] !== EMPTY_STR) {
return $link['href'];
}
}
}
}
return false;
}
}
|
