<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Network;
use DOMDocument;
use DomXPath;
use Friendica\Core\Cache\Duration;
use Friendica\Core\Hook;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\GServer;
use Friendica\Model\Profile;
use Friendica\Model\User;
use Friendica\Protocol\ActivityNamespace;
use Friendica\Protocol\ActivityPub;
use Friendica\Protocol\Email;
use Friendica\Protocol\Feed;
use Friendica\Util\Crypto;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Network;
use Friendica\Util\Strings;
use Friendica\Util\XML;
/**
* This class contain functions for probing URL
*/
class Probe
{
const WEBFINGER = '/.well-known/webfinger?resource={uri}';
private static $baseurl;
private static $istimeout;
/**
* Remove stuff from an URI that doesn't belong there
*
* @param string $URI
* @return string Cleaned URI
*/
public static function cleanURI(string $URI)
{
// At first remove leading and trailing junk
$URI = trim($URI, "@#?:/ \t\n\r\0\x0B");
$parts = parse_url($URI);
if (empty($parts['scheme'])) {
return $URI;
}
// Remove the URL fragment, since these shouldn't be part of any profile URL
unset($parts['fragment']);
$URI = Network::unparseURL($parts);
return $URI;
}
/**
* Rearrange the array so that it always has the same order
*
* @param array $data Unordered data
*
* @return array Ordered data
*/
private static function rearrangeData($data)
{
$fields = ["name", "nick", "guid", "url", "addr", "alias", "photo", "account-type",
"community", "keywords", "location", "about", "hide",
"batch", "notify", "poll", "request", "confirm", "subscribe", "poco",
"following", "followers", "inbox", "outbox", "sharedinbox",
"priority", "network", "pubkey", "baseurl", "gsid"];
$newdata = [];
foreach ($fields as $field) {
if (isset($data[$field])) {
if (in_array($field, ["gsid", "hide", "account-type"])) {
$newdata[$field] = (int)$data[$field];
} else {
$newdata[$field] = $data[$field];
}
} elseif ($field != "gsid") {
$newdata[$field] = "";
} else {
$newdata[$field] = null;
}
}
// We don't use the "priority" field anymore and replace it with a dummy.
$newdata["priority"] = 0;
return $newdata;
}
/**
* Check if the hostname belongs to the own server
*
* @param string $host The hostname that is to be checked
*
* @return bool Does the testes hostname belongs to the own server?
*/
private static function ownHost($host)
{
$own_host = DI::baseUrl()->getHostname();
$parts = parse_url($host);
if (!isset($parts['scheme'])) {
$parts = parse_url('http://'.$host);
}
if (!isset($parts['host'])) {
return false;
}
return $parts['host'] == $own_host;
}
/**
* Probes for webfinger path via "host-meta"
*
* We have to check if the servers in the future still will offer this.
* It seems as if it was dropped from the standard.
*
* @param string $host The host part of an url
*
* @return array with template and type of the webfinger template for JSON or XML
* @throws HTTPException\InternalServerErrorException
*/
private static function hostMeta($host)
{
// Reset the static variable
self::$baseurl = '';
// Handles the case when the hostname contains the scheme
if (!parse_url($host, PHP_URL_SCHEME)) {
$ssl_url = "https://" . $host . "/.well-known/host-meta";
$url = "http://" . $host . "/.well-known/host-meta";
} else {
$ssl_url = $host . "/.well-known/host-meta";
$url = '';
}
$xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
Logger::info('Probing', ['host' => $host, 'ssl_url' => $ssl_url, 'url' => $url, 'callstack' => System::callstack(20)]);
$xrd = null;
$curlResult = DI::httpRequest()->get($ssl_url, false, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
$ssl_connection_error = ($curlResult->getErrorNumber() == CURLE_COULDNT_CONNECT) || ($curlResult->getReturnCode() == 0);
if ($curlResult->isSuccess()) {
$xml = $curlResult->getBody();
$xrd = XML::parseString($xml, true);
if (!empty($url)) {
$host_url = 'https://' . $host;
} else {
$host_url = $host;
}
} elseif ($curlResult->isTimeout()) {
Logger::info('Probing timeout', ['url' => $ssl_url]);
self::$istimeout = true;
return [];
}
if (!is_object($xrd) && !empty($url)) {
$curlResult = DI::httpRequest()->get($url, false, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
$connection_error = ($curlResult->getErrorNumber() == CURLE_COULDNT_CONNECT) || ($curlResult->getReturnCode() == 0);
if ($curlResult->isTimeout()) {
Logger::info('Probing timeout', ['url' => $url]);
self::$istimeout = true;
return [];
} elseif ($connection_error && $ssl_connection_error) {
self::$istimeout = true;
return [];
}
$xml = $curlResult->getBody();
$xrd = XML::parseString($xml, true);
$host_url = 'http://'.$host;
}
if (!is_object($xrd)) {
Logger::info('No xrd object found', ['host' => $host]);
return [];
}
$links = XML::elementToArray($xrd);
if (!isset($links["xrd"]["link"])) {
Logger::info('No xrd data found', ['host' => $host]);
return [];
}
$lrdd = [];
foreach ($links["xrd"]["link"] as $value => $link) {
if (!empty($link["@attributes"])) {
$attributes = $link["@attributes"];
} elseif ($value == "@attributes") {
$attributes = $link;
} else {
continue;
}
if (!empty($attributes["rel"]) && $attributes["rel"] == "lrdd" && !empty($attributes["template"])) {
$type = (empty($attributes["type"]) ? '' : $attributes["type"]);
$lrdd[$type] = $attributes["template"];
}
}
self::$baseurl = $host_url;
Logger::info('Probing successful', ['host' => $host]);
return $lrdd;
}
/**
* Perform Webfinger lookup and return DFRN data
*
* Given an email style address, perform webfinger lookup and
* return the resulting DFRN profile URL, or if no DFRN profile URL
* is located, returns an OStatus subscription template (prefixed
* with the string 'stat:' to identify it as on OStatus template).
* If this isn't an email style address just return $webbie.
* Return an empty string if email-style addresses but webfinger fails,
* or if the resultant personal XRD doesn't contain a supported
* subscription/friend-request attribute.
*
* amended 7/9/2011 to return an hcard which could save potentially loading
* a lengthy content page to scrape dfrn attributes
*
* @param string $webbie Address that should be probed
* @param string $hcard_url Link to the hcard - is returned by reference
*
* @return string profile link
* @throws HTTPException\InternalServerErrorException
*/
public static function webfingerDfrn($webbie, &$hcard_url)
{
$profile_link = '';
$links = self::lrdd($webbie);
Logger::debug('Result', ['url' => $webbie, 'links' => $links]);
if (!empty($links) && is_array($links)) {
foreach ($links as $link) {
if ($link['@attributes']['rel'] === ActivityNamespace::DFRN) {
$profile_link = $link['@attributes']['href'];
}
if (($link['@attributes']['rel'] === ActivityNamespace::OSTATUSSUB) && ($profile_link == "")) {
$profile_link = 'stat:'.$link['@attributes']['template'];
}
if ($link['@attributes']['rel'] === 'http://microformats.org/profile/hcard') {
$hcard_url = $link['@attributes']['href'];
}
}
}
return $profile_link;
}
/**
* Check an URI for LRDD data
*
* @param string $uri Address that should be probed
*
* @return array uri data
* @throws HTTPException\InternalServerErrorException
*/
public static function lrdd(string $uri)
{
$data = self::getWebfingerArray($uri);
if (empty($data)) {
return [];
}
$webfinger = $data['webfinger'];
if (empty($webfinger["links"])) {
Logger::info('No webfinger links found', ['uri' => $uri]);
return [];
}
$data = [];
foreach ($webfinger["links"] as $link) {
$data[] = ["@attributes" => $link];
}
if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
foreach ($webfinger["aliases"] as $alias) {
$data[] = ["@attributes" =>
["rel" => "alias",
"href" => $alias]];
}
}
return $data;
}
/**
* Fetch information (protocol endpoints and user information) about a given uri
*
* @param string $uri Address that should be probed
* @param string $network Test for this specific network
* @param integer $uid User ID for the probe (only used for mails)
* @param boolean $cache Use cached values?
*
* @return array uri data
* @throws HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function uri($uri, $network = '', $uid = -1)
{
if ($uid == -1) {
$uid = local_user();
}
if (empty($network) || ($network == Protocol::ACTIVITYPUB)) {
$ap_profile = ActivityPub::probeProfile($uri);
} else {
$ap_profile = [];
}
self::$istimeout = false;
if ($network != Protocol::ACTIVITYPUB) {
$data = self::detect($uri, $network, $uid, $ap_profile);
if (!is_array($data)) {
$data = [];
}
if (empty($data) || (!empty($ap_profile) && empty($network) && (($data['network'] ?? '') != Protocol::DFRN))) {
$data = $ap_profile;
} elseif (!empty($ap_profile)) {
$ap_profile['batch'] = '';
$data = array_merge($ap_profile, $data);
}
} else {
$data = $ap_profile;
}
if (!isset($data['url'])) {
$data['url'] = $uri;
}
if (empty($data['photo'])) {
$data['photo'] = DI::baseUrl() . '/images/person-300.jpg';
}
if (empty($data['name'])) {
if (!empty($data['nick'])) {
$data['name'] = $data['nick'];
}
if (empty($data['name'])) {
$data['name'] = $data['url'];
}
}
if (empty($data['nick'])) {
$data['nick'] = strtolower($data['name']);
if (strpos($data['nick'], ' ')) {
$data['nick'] = trim(substr($data['nick'], 0, strpos($data['nick'], ' ')));
}
}
if (!empty($data['baseurl']) && empty($data['gsid'])) {
$data['gsid'] = GServer::getID($data['baseurl']);
}
if (empty($data['network'])) {
$data['network'] = Protocol::PHANTOM;
}
// Ensure that local connections always are DFRN
if (($network == '') && ($data['network'] != Protocol::PHANTOM) && (self::ownHost($data['baseurl'] ?? '') || self::ownHost($data['url']))) {
$data['network'] = Protocol::DFRN;
}
if (!isset($data['hide']) && in_array($data['network'], Protocol::FEDERATED)) {
$data['hide'] = self::getHideStatus($data['url']);
}
return self::rearrangeData($data);
}
/**
* Fetches the "hide" status from the profile
*
* @param string $url URL of the profile
*
* @return boolean "hide" status
*/
private static function getHideStatus($url)
{
$curlResult = DI::httpRequest()->get($url);
if (!$curlResult->isSuccess()) {
return false;
}
// If the file is too large then exit
if (($curlResult->getInfo()['download_content_length'] ?? 0) > 1000000) {
return false;
}
// If it isn't a HTML file then exit
if (($curlResult->getContentType() != '') && !strstr(strtolower($curlResult->getContentType()), 'html')) {
return false;
}
$body = $curlResult->getBody();
$doc = new DOMDocument();
@$doc->loadHTML($body);
$xpath = new DOMXPath($doc);
$list = $xpath->query('//meta[@name]');
foreach ($list as $node) {
$meta_tag = [];
if ($node->attributes->length) {
foreach ($node->attributes as $attribute) {
$meta_tag[$attribute->name] = $attribute->value;
}
}
if (empty($meta_tag['content'])) {
continue;
}
$content = strtolower(trim($meta_tag['content']));
switch (strtolower(trim($meta_tag['name']))) {
case 'dfrn-global-visibility':
if ($content == 'false') {
return true;
}
break;
case 'robots':
if (strpos($content, 'noindex') !== false) {
return true;
}
break;
}
}
return false;
}
/**
* Fetch the "subscribe" and add it to the result
*
* @param array $result
* @param array $webfinger
* @return array result
*/
private static function getSubscribeLink(array $result, array $webfinger)
{
if (empty($webfinger['links'])) {
return $result;
}
foreach ($webfinger['links'] as $link) {
if (!empty($link['template']) && ($link['rel'] === ActivityNamespace::OSTATUSSUB)) {
$result['subscribe'] = $link['template'];
}
}
return $result;
}
/**
* Get webfinger data from a given URI
*
* @param string $uri
* @return array Webfinger array
*/
private static function getWebfingerArray(string $uri)
{
$parts = parse_url($uri);
if (!empty($parts['scheme']) && !empty($parts['host'])) {
$host = $parts['host'];
if (!empty($parts['port'])) {
$host .= ':'.$parts['port'];
}
$baseurl = $parts['scheme'] . '://' . $host;
$nick = '';
$addr = '';
$path_parts = explode("/", trim($parts['path'] ?? '', "/"));
if (!empty($path_parts)) {
$nick = ltrim(end($path_parts), '@');
// When the last part of the URI is numeric then it is most likely an ID and not a nick name
if (!is_numeric($nick)) {
$addr = $nick."@".$host;
} else {
$nick = '';
}
}
$webfinger = self::getWebfinger($parts['scheme'] . '://' . $host . self::WEBFINGER, 'application/jrd+json', $uri, $addr);
if (empty($webfinger)) {
$lrdd = self::hostMeta($host);
}
if (empty($webfinger) && empty($lrdd)) {
while (empty($lrdd) && empty($webfinger) && (sizeof($path_parts) > 1)) {
$host .= "/".array_shift($path_parts);
$baseurl = $parts['scheme'] . '://' . $host;
if (!empty($nick)) {
$addr = $nick."@".$host;
}
$webfinger = self::getWebfinger($parts['scheme'] . '://' . $host . self::WEBFINGER, 'application/jrd+json', $uri, $addr);
if (empty($webfinger)) {
$lrdd = self::hostMeta($host);
}
}
if (empty($lrdd) && empty($webfinger)) {
return [];
}
}
} elseif (strstr($uri, '@')) {
// Remove "acct:" from the URI
$uri = str_replace('acct:', '', $uri);
$host = substr($uri, strpos($uri, '@') + 1);
$nick = substr($uri, 0, strpos($uri, '@'));
$addr = $uri;
$webfinger = self::getWebfinger('https://' . $host . self::WEBFINGER, 'application/jrd+json', $uri, $addr);
if (self::$istimeout) {
return [];
}
if (empty($webfinger)) {
$webfinger = self::getWebfinger('http://' . $host . self::WEBFINGER, 'application/jrd+json', $uri, $addr);
if (self::$istimeout) {
return [];
}
} else {
$baseurl = 'https://' . $host;
}
if (empty($webfinger)) {
$lrdd = self::hostMeta($host);
if (self::$istimeout) {
return [];
}
$baseurl = self::$baseurl;
} else {
$baseurl = 'http://' . $host;
}
} else {
Logger::info('URI was not detectable', ['uri' => $uri]);
return [];
}
if (empty($webfinger)) {
foreach ($lrdd as $type => $template) {
if ($webfinger) {
continue;
}
$webfinger = self::getWebfinger($template, $type, $uri, $addr);
}
}
if (empty($webfinger)) {
return [];
}
if ($webfinger['detected'] == $addr) {
$webfinger['nick'] = $nick;
$webfinger['addr'] = $addr;
}
$webfinger['baseurl'] = $baseurl;
return $webfinger;
}
/**
* Perform network request for webfinger data
*
* @param string $template
* @param string $type
* @param string $uri
* @param string $addr
* @return array webfinger results
*/
private static function getWebfinger(string $template, string $type, string $uri, string $addr)
{
// First try the address because this is the primary purpose of webfinger
if (!empty($addr)) {
$detected = $addr;
$path = str_replace('{uri}', urlencode("acct:" . $addr), $template);
$webfinger = self::webfinger($path, $type);
if (self::$istimeout) {
return [];
}
}
// Then try the URI
if (empty($webfinger) && $uri != $addr) {
$detected = $uri;
$path = str_replace('{uri}', urlencode($uri), $template);
$webfinger = self::webfinger($path, $type);
if (self::$istimeout) {
return [];
}
}
if (empty($webfinger)) {
return [];
}
return ['webfinger' => $webfinger, 'detected' => $detected];
}
/**
* Fetch information (protocol endpoints and user information) about a given uri
*
* This function is only called by the "uri" function that adds caching and rearranging of data.
*
* @param string $uri Address that should be probed
* @param string $network Test for this specific network
* @param integer $uid User ID for the probe (only used for mails)
* @param array $ap_profile Previously probed AP profile
*
* @return array uri data
* @throws HTTPException\InternalServerErrorException
*/
private static function detect(string $uri, string $network, int $uid, array $ap_profile)
{
$hookData = [
'uri' => $uri,
'network' => $network,
'uid' => $uid,
'result' => [],
];
Hook::callAll('probe_detect', $hookData);
if ($hookData['result']) {
if (!is_array($hookData['result'])) {
return [];
} else {
return $hookData['result'];
}
}
$parts = parse_url($uri);
if (!empty($parts['scheme']) && !empty($parts['host'])) {
if (in_array($parts['host'], ['twitter.com', 'mobile.twitter.com'])) {
return self::twitter($uri);
}
} elseif (strstr($uri, '@')) {
// If the URI starts with "mailto:" then jump directly to the mail detection
if (strpos($uri, 'mailto:') !== false) {
$uri = str_replace('mailto:', '', $uri);
return self::mail($uri, $uid);
}
if ($network == Protocol::MAIL) {
return self::mail($uri, $uid);
}
if (Strings::endsWith($uri, '@twitter.com')
|| Strings::endsWith($uri, '@mobile.twitter.com')
) {
return self::twitter($uri);
}
} else {
Logger::info('URI was not detectable', ['uri' => $uri]);
return [];
}
Logger::info('Probing start', ['uri' => $uri]);
$data = self::getWebfingerArray($uri);
if (empty($data)) {
if (!empty($parts['scheme'])) {
return self::feed($uri);
} elseif (!empty($uid)) {
return self::mail($uri, $uid);
} else {
return [];
}
}
$webfinger = $data['webfinger'];
$nick = $data['nick'] ?? '';
$addr = $data['addr'] ?? '';
$baseurl = $data['baseurl'] ?? '';
$result = [];
if (in_array($network, ["", Protocol::DFRN])) {
$result = self::dfrn($webfinger);
}
if ((!$result && ($network == "")) || ($network == Protocol::DIASPORA)) {
$result = self::diaspora($webfinger);
}
if ((!$result && ($network == "")) || ($network == Protocol::OSTATUS)) {
$result = self::ostatus($webfinger);
}
if (in_array($network, ['', Protocol::ZOT])) {
$result = self::zot($webfinger, $result, $baseurl);
}
if ((!$result && ($network == "")) || ($network == Protocol::PUMPIO)) {
$result = self::pumpio($webfinger, $addr);
}
if (empty($result['network']) && empty($ap_profile['network']) || ($network == Protocol::FEED)) {
$result = self::feed($uri);
} else {
// We overwrite the detected nick with our try if the previois routines hadn't detected it.
// Additionally it is overwritten when the nickname doesn't make sense (contains spaces).
if ((empty($result["nick"]) || (strstr($result["nick"], " "))) && ($nick != "")) {
$result["nick"] = $nick;
}
if (empty($result["addr"]) && ($addr != "")) {
$result["addr"] = $addr;
}
}
$result = self::getSubscribeLink($result, $webfinger);
if (empty($result["network"])) {
$result["network"] = Protocol::PHANTOM;
}
if (empty($result['baseurl']) && !empty($baseurl)) {
$result['baseurl'] = $baseurl;
}
if (empty($result["url"])) {
$result["url"] = $uri;
}
Logger::info('Probing done', ['uri' => $uri, 'network' => $result["network"]]);
return $result;
}
/**
* Check for Zot contact
*
* @param array $webfinger Webfinger data
* @param array $data previously probed data
*
* @return array Zot data
* @throws HTTPException\InternalServerErrorException
*/
private static function zot($webfinger, $data, $baseurl)
{
if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
foreach ($webfinger["aliases"] as $alias) {
if (substr($alias, 0, 5) == 'acct:') {
$data["addr"] = substr($alias, 5);
}
}
}
if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == "acct:")) {
$data["addr"] = substr($webfinger["subject"], 5);
}
$zot_url = '';
foreach ($webfinger['links'] as $link) {
if (($link['rel'] == 'http://purl.org/zot/protocol') && !empty($link['href'])) {
$zot_url = $link['href'];
}
}
if (empty($zot_url) && !empty($data['addr']) && !empty($baseurl)) {
$condition = ['nurl' => Strings::normaliseLink($baseurl), 'platform' => ['hubzilla']];
if (!DBA::exists('gserver', $condition)) {
return $data;
}
$zot_url = $baseurl . '/.well-known/zot-info?address=' . $data['addr'];
}
if (empty($zot_url)) {
return $data;
}
$data = self::pollZot($zot_url, $data);
if (!empty($data['url']) && !empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
foreach ($webfinger['aliases'] as $alias) {
if (!strstr($alias, '@') && Strings::normaliseLink($alias) != Strings::normaliseLink($data['url'])) {
$data['alias'] = $alias;
}
}
}
return $data;
}
public static function pollZot($url, $data)
{
$curlResult = DI::httpRequest()->get($url);
if ($curlResult->isTimeout()) {
return $data;
}
$content = $curlResult->getBody();
if (!$content) {
return $data;
}
$json = json_decode($content, true);
if (!is_array($json)) {
return $data;
}
if (empty($data['network'])) {
if (!empty($json['protocols']) && in_array('zot', $json['protocols'])) {
$data['network'] = Protocol::ZOT;
} elseif (!isset($json['protocols'])) {
$data['network'] = Protocol::ZOT;
}
}
if (!empty($json['guid']) && empty($data['guid'])) {
$data['guid'] = $json['guid'];
}
if (!empty($json['key']) && empty($data['pubkey'])) {
$data['pubkey'] = $json['key'];
}
if (!empty($json['name'])) {
$data['name'] = $json['name'];
}
if (!empty($json['photo'])) {
$data['photo'] = $json['photo'];
if (!empty($json['photo_updated'])) {
$data['photo'] .= '?rev=' . urlencode($json['photo_updated']);
}
}
if (!empty($json['address'])) {
$data['addr'] = $json['address'];
}
if (!empty($json['url'])) {
$data['url'] = $json['url'];
}
if (!empty($json['connections_url'])) {
$data['poco'] = $json['connections_url'];
}
if (isset($json['searchable'])) {
$data['hide'] = !$json['searchable'];
}
if (!empty($json['public_forum'])) {
$data['community'] = $json['public_forum'];
$data['account-type'] = User::PAGE_FLAGS_COMMUNITY;
}
if (!empty($json['profile'])) {
$profile = $json['profile'];
if (!empty($profile['description'])) {
$data['about'] = $profile['description'];
}
if (!empty($profile['keywords'])) {
$keywords = implode(', ', $profile['keywords']);
if (!empty($keywords)) {
$data['keywords'] = $keywords;
}
}
$loc = [];
if (!empty($profile['region'])) {
$loc['region'] = $profile['region'];
}
if (!empty($profile['country'])) {
$loc['country-name'] = $profile['country'];
}
$location = Profile::formatLocation($loc);
if (!empty($location)) {
$data['location'] = $location;
}
}
return $data;
}
/**
* Perform a webfinger request.
*
* For details see RFC 7033: <https://tools.ietf.org/html/rfc7033>
*
* @param string $url Address that should be probed
* @param string $type type
*
* @return array webfinger data
* @throws HTTPException\InternalServerErrorException
*/
public static function webfinger($url, $type)
{
$xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
$curlResult = DI::httpRequest()->get($url, false, ['timeout' => $xrd_timeout, 'accept_content' => $type]);
if ($curlResult->isTimeout()) {
self::$istimeout = true;
return [];
}
$data = $curlResult->getBody();
$webfinger = json_decode($data, true);
if (!empty($webfinger)) {
if (!isset($webfinger["links"])) {
Logger::info('No json webfinger links', ['url' => $url]);
return [];
}
return $webfinger;
}
// If it is not JSON, maybe it is XML
$xrd = XML::parseString($data, true);
if (!is_object($xrd)) {
Logger::info('No webfinger data retrievable', ['url' => $url]);
return [];
}
$xrd_arr = XML::elementToArray($xrd);
if (!isset($xrd_arr["xrd"]["link"])) {
Logger::info('No XML webfinger links', ['url' => $url]);
return [];
}
$webfinger = [];
if (!empty($xrd_arr["xrd"]["subject"])) {
$webfinger["subject"] = $xrd_arr["xrd"]["subject"];
}
if (!empty($xrd_arr["xrd"]["alias"])) {
$webfinger["aliases"] = $xrd_arr["xrd"]["alias"];
}
$webfinger["links"] = [];
foreach ($xrd_arr["xrd"]["link"] as $value => $data) {
if (!empty($data["@attributes"])) {
$attributes = $data["@attributes"];
} elseif ($value == "@attributes") {
$attributes = $data;
} else {
continue;
}
$webfinger["links"][] = $attributes;
}
return $webfinger;
}
/**
* Poll the Friendica specific noscrape page.
*
* "noscrape" is a faster alternative to fetch the data from the hcard.
* This functionality was originally created for the directory.
*
* @param string $noscrape_url Link to the noscrape page
* @param array $data The already fetched data
*
* @return array noscrape data
* @throws HTTPException\InternalServerErrorException
*/
private static function pollNoscrape($noscrape_url, $data)
{
$curlResult = DI::httpRequest()->get($noscrape_url);
if ($curlResult->isTimeout()) {
self::$istimeout = true;
return [];
}
$content = $curlResult->getBody();
if (!$content) {
Logger::info('Empty body', ['url' => $noscrape_url]);
return [];
}
$json = json_decode($content, true);
if (!is_array($json)) {
Logger::info('No json data', ['url' => $noscrape_url]);
return [];
}
if (!empty($json["fn"])) {
$data["name"] = $json["fn"];
}
if (!empty($json["addr"])) {
$data["addr"] = $json["addr"];
}
if (!empty($json["nick"])) {
$data["nick"] = $json["nick"];
}
if (!empty($json["guid"])) {
$data["guid"] = $json["guid"];
}
if (!empty($json["comm"])) {
$data["community"] = $json["comm"];
}
if (!empty($json["tags"])) {
$keywords = implode(", ", $json["tags"]);
if ($keywords != "") {
$data["keywords"] = $keywords;
}
}
$location = Profile::formatLocation($json);
if ($location) {
$data["location"] = $location;
}
if (!empty($json["about"])) {
$data["about"] = $json["about"];
}
if (!empty($json["key"])) {
$data["pubkey"] = $json["key"];
}
if (!empty($json["photo"])) {
$data["photo"] = $json["photo"];
}
if (!empty($json["dfrn-request"])) {
$data["request"] = $json["dfrn-request"];
}
if (!empty($json["dfrn-confirm"])) {
$data["confirm"] = $json["dfrn-confirm"];
}
if (!empty($json["dfrn-notify"])) {
$data["notify"] = $json["dfrn-notify"];
}
if (!empty($json["dfrn-poll"])) {
$data["poll"] = $json["dfrn-poll"];
}
if (isset($json["hide"])) {
$data["hide"] = (bool)$json["hide"];
} else {
$data["hide"] = false;
}
return $data;
}
/**
* Check for valid DFRN data
*
* @param array $data DFRN data
*
* @return int Number of errors
*/
public static function validDfrn($data)
{
$errors = 0;
if (!isset($data['key'])) {
$errors ++;
}
if (!isset($data['dfrn-request'])) {
$errors ++;
}
if (!isset($data['dfrn-confirm'])) {
$errors ++;
}
if (!isset($data['dfrn-notify'])) {
$errors ++;
}
if (!isset($data['dfrn-poll'])) {
$errors ++;
}
return $errors;
}
/**
* Fetch data from a DFRN profile page and via "noscrape"
*
* @param string $profile_link Link to the profile page
*
* @return array profile data
* @throws HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
public static function profile($profile_link)
{
$data = [];
Logger::info('Check profile', ['link' => $profile_link]);
// Fetch data via noscrape - this is faster
$noscrape_url = str_replace(["/hcard/", "/profile/"], "/noscrape/", $profile_link);
$data = self::pollNoscrape($noscrape_url, $data);
if (!isset($data["notify"])
|| !isset($data["confirm"])
|| !isset($data["request"])
|| !isset($data["poll"])
|| !isset($data["name"])
|| !isset($data["photo"])
) {
$data = self::pollHcard($profile_link, $data, true);
}
$prof_data = [];
if (empty($data["addr"]) || empty($data["nick"])) {
$probe_data = self::uri($profile_link);
$data["addr"] = ($data["addr"] ?? '') ?: $probe_data["addr"];
$data["nick"] = ($data["nick"] ?? '') ?: $probe_data["nick"];
}
$prof_data["addr"] = $data["addr"];
$prof_data["nick"] = $data["nick"];
$prof_data["dfrn-request"] = $data['request'] ?? null;
$prof_data["dfrn-confirm"] = $data['confirm'] ?? null;
$prof_data["dfrn-notify"] = $data['notify'] ?? null;
$prof_data["dfrn-poll"] = $data['poll'] ?? null;
$prof_data["photo"] = $data['photo'] ?? null;
$prof_data["fn"] = $data['name'] ?? null;
$prof_data["key"] = $data['pubkey'] ?? null;
Logger::debug('Result', ['link' => $profile_link, 'data' => $prof_data]);
return $prof_data;
}
/**
* Check for DFRN contact
*
* @param array $webfinger Webfinger data
*
* @return array DFRN data
* @throws HTTPException\InternalServerErrorException
*/
private static function dfrn($webfinger)
{
$hcard_url = "";
$data = [];
// The array is reversed to take into account the order of preference for same-rel links
// See: https://tools.ietf.org/html/rfc7033#section-4.4.4
foreach (array_reverse($webfinger["links"]) as $link) {
if (($link["rel"] == ActivityNamespace::DFRN) && !empty($link["href"])) {
$data["network"] = Protocol::DFRN;
} elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
$data["poll"] = $link["href"];
} elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && (($link["type"] ?? "") == "text/html") && !empty($link["href"])) {
$data["url"] = $link["href"];
} elseif (($link["rel"] == "http://microformats.org/profile/hcard") && !empty($link["href"])) {
$hcard_url = $link["href"];
} elseif (($link["rel"] == ActivityNamespace::POCO) && !empty($link["href"])) {
$data["poco"] = $link["href"];
} elseif (($link["rel"] == "http://webfinger.net/rel/avatar") && !empty($link["href"])) {
$data["photo"] = $link["href"];
} elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && !empty($link["href"])) {
$data["baseurl"] = trim($link["href"], '/');
} elseif (($link["rel"] == "http://joindiaspora.com/guid") && !empty($link["href"])) {
$data["guid"] = $link["href"];
} elseif (($link["rel"] == "diaspora-public-key") && !empty($link["href"])) {
$data["pubkey"] = base64_decode($link["href"]);
//if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
if (strstr($data["pubkey"], 'RSA ')) {
$data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
}
}
}
if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
foreach ($webfinger["aliases"] as $alias) {
if (empty($data["url"]) && !strstr($alias, "@")) {
$data["url"] = $alias;
} elseif (!strstr($alias, "@") && Strings::normaliseLink($alias) != Strings::normaliseLink($data["url"])) {
$data["alias"] = $alias;
} elseif (substr($alias, 0, 5) == 'acct:') {
$data["addr"] = substr($alias, 5);
}
}
}
if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == "acct:")) {
$data["addr"] = substr($webfinger["subject"], 5);
}
if (!isset($data["network"]) || ($hcard_url == "")) {
return [];
}
// Fetch data via noscrape - this is faster
$noscrape_url = str_replace("/hcard/", "/noscrape/", $hcard_url);
$data = self::pollNoscrape($noscrape_url, $data);
if (isset($data["notify"])
&& isset($data["confirm"])
&& isset($data["request"])
&& isset($data["poll"])
&& isset($data["name"])
&& isset($data["photo"])
) {
return $data;
}
$data = self::pollHcard($hcard_url, $data, true);
return $data;
}
/**
* Poll the hcard page (Diaspora and Friendica specific)
*
* @param string $hcard_url Link to the hcard page
* @param array $data The already fetched data
* @param boolean $dfrn Poll DFRN specific data
*
* @return array hcard data
* @throws HTTPException\InternalServerErrorException
*/
private static function pollHcard($hcard_url, $data, $dfrn = false)
{
$curlResult = DI::httpRequest()->get($hcard_url);
if ($curlResult->isTimeout()) {
self::$istimeout = true;
return [];
}
$content = $curlResult->getBody();
if (!$content) {
return [];
}
$doc = new DOMDocument();
if (!@$doc->loadHTML($content)) {
return [];
}
$xpath = new DomXPath($doc);
$vcards = $xpath->query("//div[contains(concat(' ', @class, ' '), ' vcard ')]");
if (!is_object($vcards)) {
return [];
}
if (!isset($data["baseurl"])) {
$data["baseurl"] = "";
}
if ($vcards->length > 0) {
$vcard = $vcards->item(0);
// We have to discard the guid from the hcard in favour of the guid from lrdd
// Reason: Hubzilla doesn't use the value "uid" in the hcard like Diaspora does.
$search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' uid ')]", $vcard); // */
if (($search->length > 0) && empty($data["guid"])) {
$data["guid"] = $search->item(0)->nodeValue;
}
$search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' nickname ')]", $vcard); // */
if ($search->length > 0) {
$data["nick"] = $search->item(0)->nodeValue;
}
$search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' fn ')]", $vcard); // */
if ($search->length > 0) {
$data["name"] = $search->item(0)->nodeValue;
}
$search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' searchable ')]", $vcard); // */
if ($search->length > 0) {
$data["searchable"] = $search->item(0)->nodeValue;
}
$search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' key ')]", $vcard); // */
if ($search->length > 0) {
$data["pubkey"] = $search->item(0)->nodeValue;
if (strstr($data["pubkey"], 'RSA ')) {
$data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
}
}
$search = $xpath->query("//*[@id='pod_location']", $vcard); // */
if ($search->length > 0) {
$data["baseurl"] = trim($search->item(0)->nodeValue, "/");
}
}
$avatar = [];
if (!empty($vcard)) {
$photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
foreach ($photos as $photo) {
$attr = [];
foreach ($photo->attributes as $attribute) {
$attr[$attribute->name] = trim($attribute->value);
}
if (isset($attr["src"]) && isset($attr["width"])) {
$avatar[$attr["width"]] = $attr["src"];
}
// We don't have a width. So we just take everything that we got.
// This is a Hubzilla workaround which doesn't send a width.
if ((sizeof($avatar) == 0) && !empty($attr["src"])) {
$avatar[] = $attr["src"];
}
}
}
if (sizeof($avatar)) {
ksort($avatar);
$data["photo"] = self::fixAvatar(array_pop($avatar), $data["baseurl"]);
}
if ($dfrn) {
// Poll DFRN specific data
$search = $xpath->query("//link[contains(concat(' ', @rel), ' dfrn-')]");
if ($search->length > 0) {
foreach ($search as $link) {
//$data["request"] = $search->item(0)->nodeValue;
$attr = [];
foreach ($link->attributes as $attribute) {
$attr[$attribute->name] = trim($attribute->value);
}
$data[substr($attr["rel"], 5)] = $attr["href"];
}
}
// Older Friendica versions had used the "uid" field differently than newer versions
if (!empty($data["nick"]) && !empty($data["guid"]) && ($data["nick"] == $data["guid"])) {
unset($data["guid"]);
}
}
return $data;
}
/**
* Check for Diaspora contact
*
* @param array $webfinger Webfinger data
*
* @return array Diaspora data
* @throws HTTPException\InternalServerErrorException
*/
private static function diaspora($webfinger)
{
$hcard_url = "";
$data = [];
// The array is reversed to take into account the order of preference for same-rel links
// See: https://tools.ietf.org/html/rfc7033#section-4.4.4
foreach (array_reverse($webfinger["links"]) as $link) {
if (($link["rel"] == "http://microformats.org/profile/hcard") && !empty($link["href"])) {
$hcard_url = $link["href"];
} elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && !empty($link["href"])) {
$data["baseurl"] = trim($link["href"], '/');
} elseif (($link["rel"] == "http://joindiaspora.com/guid") && !empty($link["href"])) {
$data["guid"] = $link["href"];
} elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && (($link["type"] ?? "") == "text/html") && !empty($link["href"])) {
$data["url"] = $link["href"];
} elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
$data["poll"] = $link["href"];
} elseif (($link["rel"] == ActivityNamespace::POCO) && !empty($link["href"])) {
$data["poco"] = $link["href"];
} elseif (($link["rel"] == "salmon") && !empty($link["href"])) {
$data["notify"] = $link["href"];
} elseif (($link["rel"] == "diaspora-public-key") && !empty($link["href"])) {
$data["pubkey"] = base64_decode($link["href"]);
//if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
if (strstr($data["pubkey"], 'RSA ')) {
$data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
}
}
}
if (empty($data["url"]) || empty($hcard_url)) {
return [];
}
if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
foreach ($webfinger["aliases"] as $alias) {
if (Strings::normaliseLink($alias) != Strings::normaliseLink($data["url"]) && ! strstr($alias, "@")) {
$data["alias"] = $alias;
} elseif (substr($alias, 0, 5) == 'acct:') {
$data["addr"] = substr($alias, 5);
}
}
}
if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == 'acct:')) {
$data["addr"] = substr($webfinger["subject"], 5);
}
// Fetch further information from the hcard
$data = self::pollHcard($hcard_url, $data);
if (!$data) {
return [];
}
if (!empty($data["url"])
&& !empty($data["guid"])
&& !empty($data["baseurl"])
&& !empty($data["pubkey"])
&& !empty($hcard_url)
) {
$data["network"] = Protocol::DIASPORA;
// The Diaspora handle must always be lowercase
if (!empty($data["addr"])) {
$data["addr"] = strtolower($data["addr"]);
}
// We have to overwrite the detected value for "notify" since Hubzilla doesn't send it
$data["notify"] = $data["baseurl"] . "/receive/users/" . $data["guid"];
$data["batch"] = $data["baseurl"] . "/receive/public";
} else {
return [];
}
return $data;
}
/**
* Check for OStatus contact
*
* @param array $webfinger Webfinger data
* @param bool $short Short detection mode
*
* @return array|bool OStatus data or "false" on error or "true" on short mode
* @throws HTTPException\InternalServerErrorException
*/
private static function ostatus($webfinger, $short = false)
{
$data = [];
if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
foreach ($webfinger["aliases"] as $alias) {
if (strstr($alias, "@") && !strstr(Strings::normaliseLink($alias), "http://")) {
$data["addr"] = str_replace('acct:', '', $alias);
}
}
}
if (!empty($webfinger["subject"]) && strstr($webfinger["subject"], "@")
&& !strstr(Strings::normaliseLink($webfinger["subject"]), "http://")
) {
$data["addr"] = str_replace('acct:', '', $webfinger["subject"]);
}
if (!empty($webfinger["links"])) {
// The array is reversed to take into account the order of preference for same-rel links
// See: https://tools.ietf.org/html/rfc7033#section-4.4.4
foreach (array_reverse($webfinger["links"]) as $link) {
if (($link["rel"] == "http://webfinger.net/rel/profile-page")
&& (($link["type"] ?? "") == "text/html")
&& ($link["href"] != "")
) {
$data["url"] = $data["alias"] = $link["href"];
} elseif (($link["rel"] == "salmon") && !empty($link["href"])) {
$data["notify"] = $link["href"];
} elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
$data["poll"] = $link["href"];
} elseif (($link["rel"] == "magic-public-key") && !empty($link["href"])) {
$pubkey = $link["href"];
if (substr($pubkey, 0, 5) === 'data:') {
if (strstr($pubkey, ',')) {
$pubkey = substr($pubkey, strpos($pubkey, ',') + 1);
} else {
$pubkey = substr($pubkey, 5);
}
} elseif (Strings::normaliseLink($pubkey) == 'http://') {
$curlResult = DI::httpRequest()->get($pubkey);
if ($curlResult->isTimeout()) {
self::$istimeout = true;
return $short ? false : [];
}
$pubkey = $curlResult->getBody();
}
$key = explode(".", $pubkey);
if (sizeof($key) >= 3) {
$m = Strings::base64UrlDecode($key[1]);
$e = Strings::base64UrlDecode($key[2]);
$data["pubkey"] = Crypto::meToPem($m, $e);
}
}
}
}
if (isset($data["notify"]) && isset($data["pubkey"])
&& isset($data["poll"])
&& isset($data["url"])
) {
$data["network"] = Protocol::OSTATUS;
} else {
return $short ? false : [];
}
if ($short) {
return true;
}
// Fetch all additional data from the feed
$curlResult = DI::httpRequest()->get($data["poll"]);
if ($curlResult->isTimeout()) {
self::$istimeout = true;
return [];
}
$feed = $curlResult->getBody();
$feed_data = Feed::import($feed);
if (!$feed_data) {
return [];
}
if (!empty($feed_data["header"]["author-name"])) {
$data["name"] = $feed_data["header"]["author-name"];
}
if (!empty($feed_data["header"]["author-nick"])) {
$data["nick"] = $feed_data["header"]["author-nick"];
}
if (!empty($feed_data["header"]["author-avatar"])) {
$data["photo"] = self::fixAvatar($feed_data["header"]["author-avatar"], $data["url"]);
}
if (!empty($feed_data["header"]["author-id"])) {
$data["alias"] = $feed_data["header"]["author-id"];
}
if (!empty($feed_data["header"]["author-location"])) {
$data["location"] = $feed_data["header"]["author-location"];
}
if (!empty($feed_data["header"]["author-about"])) {
$data["about"] = $feed_data["header"]["author-about"];
}
// OStatus has serious issues when the the url doesn't fit (ssl vs. non ssl)
// So we take the value that we just fetched, although the other one worked as well
if (!empty($feed_data["header"]["author-link"])) {
$data["url"] = $feed_data["header"]["author-link"];
}
if ($data["url"] == $data["alias"]) {
$data["alias"] = '';
}
/// @todo Fetch location and "about" from the feed as well
return $data;
}
/**
* Fetch data from a pump.io profile page
*
* @param string $profile_link Link to the profile page
*
* @return array profile data
*/
private static function pumpioProfileData($profile_link)
{
$curlResult = DI::httpRequest()->get($profile_link);
if (!$curlResult->isSuccess()) {
return [];
}
$doc = new DOMDocument();
if (!@$doc->loadHTML($curlResult->getBody())) {
return [];
}
$xpath = new DomXPath($doc);
$data = [];
$data["name"] = $xpath->query("//span[contains(@class, 'p-name')]")->item(0)->nodeValue;
if ($data["name"] == '') {
// This is ugly - but pump.io doesn't seem to know a better way for it
$data["name"] = trim($xpath->query("//h1[@class='media-header']")->item(0)->nodeValue);
$pos = strpos($data["name"], chr(10));
if ($pos) {
$data["name"] = trim(substr($data["name"], 0, $pos));
}
}
$data["location"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-locality')]");
if ($data["location"] == '') {
$data["location"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'location')]");
}
$data["about"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-note')]");
if ($data["about"] == '') {
$data["about"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'summary')]");
}
$avatar = $xpath->query("//img[contains(@class, 'u-photo')]")->item(0);
if (!$avatar) {
$avatar = $xpath->query("//img[@class='img-rounded media-object']")->item(0);
}
if ($avatar) {
foreach ($avatar->attributes as $attribute) {
if ($attribute->name == "src") {
$data["photo"] = trim($attribute->value);
}
}
}
return $data;
}
/**
* Check for pump.io contact
*
* @param array $webfinger Webfinger data
* @param string $addr
* @return array pump.io data
*/
private static function pumpio($webfinger, $addr)
{
$data = [];
// The array is reversed to take into account the order of preference for same-rel links
// See: https://tools.ietf.org/html/rfc7033#section-4.4.4
foreach (array_reverse($webfinger["links"]) as $link) {
if (($link["rel"] == "http://webfinger.net/rel/profile-page")
&& (($link["type"] ?? "") == "text/html")
&& ($link["href"] != "")
) {
$data["url"] = $link["href"];
} elseif (($link["rel"] == "activity-inbox") && ($link["href"] != "")) {
$data["notify"] = $link["href"];
} elseif (($link["rel"] == "activity-outbox") && ($link["href"] != "")) {
$data["poll"] = $link["href"];
} elseif (($link["rel"] == "dialback") && ($link["href"] != "")) {
$data["dialback"] = $link["href"];
}
}
if (isset($data["poll"]) && isset($data["notify"])
&& isset($data["dialback"])
&& isset($data["url"])
) {
// by now we use these fields only for the network type detection
// So we unset all data that isn't used at the moment
unset($data["dialback"]);
$data["network"] = Protocol::PUMPIO;
} else {
return [];
}
$profile_data = self::pumpioProfileData($data["url"]);
if (!$profile_data) {
return [];
}
$data = array_merge($data, $profile_data);
if (($addr != '') && ($data['name'] != '')) {
$name = trim(str_replace($addr, '', $data['name']));
if ($name != '') {
$data['name'] = $name;
}
}
return $data;
}
/**
* Check for twitter contact
*
* @param string $uri
*
* @return array twitter data
*/
private static function twitter($uri)
{
if (preg_match('=([^@]+)@(?:mobile\.)?twitter\.com$=i', $uri, $matches)) {
$nick = $matches[1];
} elseif (preg_match('=^https?://(?:mobile\.)?twitter\.com/(.+)=i', $uri, $matches)) {
$nick = $matches[1];
} else {
return [];
}
$data = [];
$data['url'] = 'https://twitter.com/' . $nick;
$data['addr'] = $nick . '@twitter.com';
$data['nick'] = $data['name'] = $nick;
$data['network'] = Protocol::TWITTER;
$data['baseurl'] = 'https://twitter.com';
return $data;
}
/**
* Checks HTML page for RSS feed link
*
* @param string $url Page link
* @param string $body Page body string
* @return string|false Feed link or false if body was invalid HTML document
*/
public static function getFeedLink(string $url, string $body)
{
$doc = new DOMDocument();
if (!@$doc->loadHTML($body)) {
return false;
}
$xpath = new DOMXPath($doc);
$feedUrl = $xpath->evaluate('string(/html/head/link[@type="application/rss+xml" and @rel="alternate"]/@href)');
$feedUrl = $feedUrl ? self::ensureAbsoluteLinkFromHTMLDoc($feedUrl, $url, $xpath) : '';
return $feedUrl;
}
/**
* Return an absolute URL in the context of a HTML document retrieved from the provided URL.
*
* Loosely based on RFC 1808
*
* @see https://tools.ietf.org/html/rfc1808
*
* @param string $href The potential relative href found in the HTML document
* @param string $base The HTML document URL
* @param DOMXPath $xpath The HTML document XPath
* @return string
*/
private static function ensureAbsoluteLinkFromHTMLDoc(string $href, string $base, DOMXPath $xpath)
{
if (filter_var($href, FILTER_VALIDATE_URL)) {
return $href;
}
$base = $xpath->evaluate('string(/html/head/base/@href)') ?: $base;
$baseParts = parse_url($base);
if (empty($baseParts['host'])) {
return $href;
}
// Naked domain case (scheme://basehost)
$path = $baseParts['path'] ?? '/';
// Remove the filename part of the path if it exists (/base/path/file)
$path = implode('/', array_slice(explode('/', $path), 0, -1));
$hrefParts = parse_url($href);
// Root path case (/path) including relative scheme case (//host/path)
if ($hrefParts['path'] && $hrefParts['path'][0] == '/') {
$path = $hrefParts['path'];
} else {
$path = $path . '/' . $hrefParts['path'];
// Resolve arbitrary relative path
// Lifted from https://www.php.net/manual/en/function.realpath.php#84012
$parts = array_filter(explode('/', $path), 'strlen');
$absolutes = array();
foreach ($parts as $part) {
if ('.' == $part) continue;
if ('..' == $part) {
array_pop($absolutes);
} else {
$absolutes[] = $part;
}
}
$path = '/' . implode('/', $absolutes);
}
// Relative scheme case (//host/path)
$baseParts['host'] = $hrefParts['host'] ?? $baseParts['host'];
$baseParts['path'] = $path;
unset($baseParts['query']);
unset($baseParts['fragment']);
return Network::unparseURL($baseParts);
}
/**
* Check for feed contact
*
* @param string $url Profile link
* @param boolean $probe Do a probe if the page contains a feed link
*
* @return array feed data
* @throws HTTPException\InternalServerErrorException
*/
private static function feed($url, $probe = true)
{
$curlResult = DI::httpRequest()->get($url);
if ($curlResult->isTimeout()) {
self::$istimeout = true;
return [];
}
$feed = $curlResult->getBody();
$feed_data = Feed::import($feed);
if (!$feed_data) {
if (!$probe) {
return [];
}
$feed_url = self::getFeedLink($url, $feed);
if (!$feed_url) {
return [];
}
return self::feed($feed_url, false);
}
if (!empty($feed_data["header"]["author-name"])) {
$data["name"] = $feed_data["header"]["author-name"];
}
if (!empty($feed_data["header"]["author-nick"])) {
$data["nick"] = $feed_data["header"]["author-nick"];
}
if (!empty($feed_data["header"]["author-avatar"])) {
$data["photo"] = $feed_data["header"]["author-avatar"];
}
if (!empty($feed_data["header"]["author-id"])) {
$data["alias"] = $feed_data["header"]["author-id"];
}
$data["url"] = $url;
$data["poll"] = $url;
$data["network"] = Protocol::FEED;
return $data;
}
/**
* Check for mail contact
*
* @param string $uri Profile link
* @param integer $uid User ID
*
* @return array mail data
* @throws \Exception
*/
private static function mail($uri, $uid)
{
if (!Network::isEmailDomainValid($uri)) {
return [];
}
if ($uid == 0) {
return [];
}
$user = DBA::selectFirst('user', ['prvkey'], ['uid' => $uid]);
$condition = ["`uid` = ? AND `server` != ''", $uid];
$fields = ['pass', 'user', 'server', 'port', 'ssltype', 'mailbox'];
$mailacct = DBA::selectFirst('mailacct', $fields, $condition);
if (!DBA::isResult($user) || !DBA::isResult($mailacct)) {
return [];
}
$mailbox = Email::constructMailboxName($mailacct);
$password = '';
openssl_private_decrypt(hex2bin($mailacct['pass']), $password, $user['prvkey']);
$mbox = Email::connect($mailbox, $mailacct['user'], $password);
if (!$mbox) {
return [];
}
$msgs = Email::poll($mbox, $uri);
Logger::info('Messages found', ['uri' => $uri, 'count' => count($msgs)]);
if (!count($msgs)) {
return [];
}
$phost = substr($uri, strpos($uri, '@') + 1);
$data = [];
$data["addr"] = $uri;
$data["network"] = Protocol::MAIL;
$data["name"] = substr($uri, 0, strpos($uri, '@'));
$data["nick"] = $data["name"];
$data["photo"] = Network::lookupAvatarByEmail($uri);
$data["url"] = 'mailto:'.$uri;
$data["notify"] = 'smtp ' . Strings::getRandomHex();
$data["poll"] = 'email ' . Strings::getRandomHex();
$x = Email::messageMeta($mbox, $msgs[0]);
if (stristr($x[0]->from, $uri)) {
$adr = imap_rfc822_parse_adrlist($x[0]->from, '');
} elseif (stristr($x[0]->to, $uri)) {
$adr = imap_rfc822_parse_adrlist($x[0]->to, '');
}
if (isset($adr)) {
foreach ($adr as $feadr) {
if ((strcasecmp($feadr->mailbox, $data["name"]) == 0)
&&(strcasecmp($feadr->host, $phost) == 0)
&& (strlen($feadr->personal))
) {
$personal = imap_mime_header_decode($feadr->personal);
$data["name"] = "";
foreach ($personal as $perspart) {
if ($perspart->charset != "default") {
$data["name"] .= iconv($perspart->charset, 'UTF-8//IGNORE', $perspart->text);
} else {
$data["name"] .= $perspart->text;
}
}
$data["name"] = Strings::escapeTags($data["name"]);
}
}
}
if (!empty($mbox)) {
imap_close($mbox);
}
return $data;
}
/**
* Mix two paths together to possibly fix missing parts
*
* @param string $avatar Path to the avatar
* @param string $base Another path that is hopefully complete
*
* @return string fixed avatar path
* @throws \Exception
*/
public static function fixAvatar($avatar, $base)
{
$base_parts = parse_url($base);
// Remove all parts that could create a problem
unset($base_parts['path']);
unset($base_parts['query']);
unset($base_parts['fragment']);
$avatar_parts = parse_url($avatar);
// Now we mix them
$parts = array_merge($base_parts, $avatar_parts);
// And put them together again
$scheme = isset($parts['scheme']) ? $parts['scheme'] . '://' : '';
$host = isset($parts['host']) ? $parts['host'] : '';
$port = isset($parts['port']) ? ':' . $parts['port'] : '';
$path = isset($parts['path']) ? $parts['path'] : '';
$query = isset($parts['query']) ? '?' . $parts['query'] : '';
$fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : '';
$fixed = $scheme.$host.$port.$path.$query.$fragment;
Logger::debug('Avatar fixed', ['base' => $base, 'avatar' => $avatar, 'fixed' => $fixed]);
return $fixed;
}
/**
* Fetch the last date that the contact had posted something (publically)
*
* @param string $data probing result
* @return string last activity
*/
public static function getLastUpdate(array $data)
{
if ($lastUpdate = self::updateFromNoScrape($data)) {
return $lastUpdate;
}
if (!empty($data['outbox'])) {
return self::updateFromOutbox($data['outbox'], $data);
} elseif (!empty($data['poll']) && ($data['network'] == Protocol::ACTIVITYPUB)) {
return self::updateFromOutbox($data['poll'], $data);
} elseif (!empty($data['poll'])) {
return self::updateFromFeed($data);
}
return '';
}
/**
* Fetch the last activity date from the "noscrape" endpoint
*
* @param array $data Probing result
* @return string last activity
*
* @return bool 'true' if update was successful or the server was unreachable
*/
private static function updateFromNoScrape(array $data)
{
if (empty($data['baseurl'])) {
return '';
}
// Check the 'noscrape' endpoint when it is a Friendica server
$gserver = DBA::selectFirst('gserver', ['noscrape'], ["`nurl` = ? AND `noscrape` != ''",
Strings::normaliseLink($data['baseurl'])]);
if (!DBA::isResult($gserver)) {
return '';
}
$curlResult = DI::httpRequest()->get($gserver['noscrape'] . '/' . $data['nick']);
if ($curlResult->isSuccess() && !empty($curlResult->getBody())) {
$noscrape = json_decode($curlResult->getBody(), true);
if (!empty($noscrape) && !empty($noscrape['updated'])) {
return DateTimeFormat::utc($noscrape['updated'], DateTimeFormat::MYSQL);
}
}
return '';
}
/**
* Fetch the last activity date from an ActivityPub Outbox
*
* @param string $feed
* @param array $data Probing result
* @return string last activity
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
private static function updateFromOutbox(string $feed, array $data)
{
$outbox = ActivityPub::fetchContent($feed);
if (empty($outbox)) {
return '';
}
if (!empty($outbox['orderedItems'])) {
$items = $outbox['orderedItems'];
} elseif (!empty($outbox['first']['orderedItems'])) {
$items = $outbox['first']['orderedItems'];
} elseif (!empty($outbox['first']['href']) && ($outbox['first']['href'] != $feed)) {
return self::updateFromOutbox($outbox['first']['href'], $data);
} elseif (!empty($outbox['first'])) {
if (is_string($outbox['first']) && ($outbox['first'] != $feed)) {
return self::updateFromOutbox($outbox['first'], $data);
} else {
Logger::warning('Unexpected data', ['outbox' => $outbox]);
}
return '';
} else {
$items = [];
}
$last_updated = '';
foreach ($items as $activity) {
if (!empty($activity['published'])) {
$published = DateTimeFormat::utc($activity['published']);
} elseif (!empty($activity['object']['published'])) {
$published = DateTimeFormat::utc($activity['object']['published']);
} else {
continue;
}
if ($last_updated < $published) {
$last_updated = $published;
}
}
if (!empty($last_updated)) {
return $last_updated;
}
return '';
}
/**
* Fetch the last activity date from an XML feed
*
* @param array $data Probing result
* @return string last activity
*/
private static function updateFromFeed(array $data)
{
// Search for the newest entry in the feed
$curlResult = DI::httpRequest()->get($data['poll']);
if (!$curlResult->isSuccess()) {
return '';
}
$doc = new DOMDocument();
@$doc->loadXML($curlResult->getBody());
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
$entries = $xpath->query('/atom:feed/atom:entry');
$last_updated = '';
foreach ($entries as $entry) {
$published_item = $xpath->query('atom:published/text()', $entry)->item(0);
$updated_item = $xpath->query('atom:updated/text()' , $entry)->item(0);
$published = !empty($published_item->nodeValue) ? DateTimeFormat::utc($published_item->nodeValue) : null;
$updated = !empty($updated_item->nodeValue) ? DateTimeFormat::utc($updated_item->nodeValue) : null;
if (empty($published) || empty($updated)) {
Logger::notice('Invalid entry for XPath.', ['entry' => $entry, 'url' => $data['url']]);
continue;
}
if ($last_updated < $published) {
$last_updated = $published;
}
if ($last_updated < $updated) {
$last_updated = $updated;
}
}
if (!empty($last_updated)) {
return $last_updated;
}
return '';
}
}