From a1d57abfe45d832aa36f9615eea35c6900c6f5b8 Mon Sep 17 00:00:00 2001
From: Tobias Diekershoff <tobias.diekershoff@gmx.net>
Date: Sat, 5 Nov 2022 15:38:28 +0100
Subject: [PATCH] add the new CheckRelMeProfileLink class to the worker

---
 src/Worker/CheckRelMeProfileLink.php | 102 +++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 src/Worker/CheckRelMeProfileLink.php

diff --git a/src/Worker/CheckRelMeProfileLink.php b/src/Worker/CheckRelMeProfileLink.php
new file mode 100644
index 0000000000..691931bdc3
--- /dev/null
+++ b/src/Worker/CheckRelMeProfileLink.php
@@ -0,0 +1,102 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2022, the Friendica project
+ *
+ * @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\Worker;
+
+use DOMDocument;
+use Friendica\DI;
+use Friendica\Database\DBA;
+use Friendica\Core\Logger;
+use Friendica\Model\Profile;
+use Friendica\Model\User;
+use Friendica\Network\HTTPClient\Client\HttpClientAccept;
+use Friendica\Network\HTTPClient\Client\HttpClientOptions;
+use Friendica\Util\Network;
+use Friendica\Util\Strings;
+
+/* This class is used to verify the homepage link of a user profile.
+ * To do so, we look for rel="me" links in the given homepage, if one
+ * of them points to the Friendica profile of the user, a verification
+ * mark is added to the link.
+ *
+ * To reverse the process, if a homepage link is given, it is displayed
+ * with the rel="me" attribute as well, so that 3rd party tools can
+ * verify the connection between the two pages.
+ *
+ * This task will be performed by the worker on a daily basis _and_ every
+ * time the user changes their homepage link. In the first case the priority
+ * of the task is set to LOW, with the second case it is MEDIUM.
+ *
+ * rel-me microformat docs https://microformats.org/wiki/rel-me
+ */
+class CheckRelMeProfileLink
+{
+	/* Cheks the homepage of a profile for a rel-me link back to the user profile
+	 *
+	 * @param $uid (int) the UID of the user
+	 */
+	public static function execute(int $uid)
+	{
+		Logger::notice('Verifying the homepage', [$uid]);
+		$homepageUrlVerified = false;
+		$owner = User::getOwnerDataById($uid);
+		Logger::notice(print_r($owner));
+		if (!empty($owner['homepage'])) {
+			$xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
+			$curlResult = DI::httpClient()->get($owner['homepage'], $accept_content = HttpClientAccept::HTML, [HttpClientOptions::TIMEOUT => $xrd_timeout]);
+			if ($curlResult->isTimeout()) {
+				Logger::notice('Could not check homepage link of the user because the page loading request timed out.', [$uid, $owner['homepage']]);
+			} else {
+				$content = $curlResult->getBody();
+				if (!$content) {
+					Logger::notice('Empty body of the fetched homepage link). Cannot verify the relation to profile of UID %s.', [$uid, $owner['homepage']]);
+				} else {
+					$doc = new DOMDocument();
+					$doc->loadHTML($content);
+					if (!$doc) {
+						Logger::notice('Could not parse the content');
+					} else {
+						foreach ($doc->getElementsByTagName('a') as $link) {
+							$rel = $link->getAttribute('rel');
+							if ($rel=='me') {
+								$href = $link->getAttribute('href');
+								if (strpos($href, 'http')!==false) {
+									if (!$homepageUrlVerified) {
+										$homepageUrlVerified = Strings::compareLink($owner['url'], $href);
+									}
+								}
+							}
+						}
+					}
+					if ($homepageUrlVerified) {
+						Profile::update(['homepage_verified' => 1], $uid);
+						Logger::notice('Homepage URL verified', [$uid, $owner['homepage']]);
+					} else {
+						Profile::update(['homepage_verified' => 0], $uid);
+						Logger::notice('Homepage URL could not be verified', [$uid, $owner['homepage']]);
+					}
+				}
+			}
+		} else {
+			Logger::notice('The user has no homepage link.', [$uid]);
+		}
+	}
+}
-- 
2.39.5