X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FProtocol%2FDFRN.php;h=0b6e02f096118ad37e98076193262a9a9ea59515;hb=03bf1dcbd3c9760a15b22df9c04cc6f7b30fbb2d;hp=5fceab3264d7ab9cc70056c7db2486db4c991124;hpb=de4008d23b861281f4311916d491db1be82358c7;p=friendica.git

diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index 5fceab3264..0b6e02f096 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -10,7 +10,8 @@ namespace Friendica\Protocol;
 
 use DOMDocument;
 use DOMXPath;
-use Friendica\App;
+use Friendica\App\BaseURL;
+use Friendica\BaseObject;
 use Friendica\Content\OEmbed;
 use Friendica\Content\Text\BBCode;
 use Friendica\Content\Text\HTML;
@@ -29,10 +30,12 @@ use Friendica\Model\Mail;
 use Friendica\Model\PermissionSet;
 use Friendica\Model\Profile;
 use Friendica\Model\User;
+use Friendica\Network\Probe;
 use Friendica\Object\Image;
-use Friendica\Util\BaseURL;
+use Friendica\Protocol\ActivityNamespace;
 use Friendica\Util\Crypto;
 use Friendica\Util\DateTimeFormat;
+use Friendica\Util\Images;
 use Friendica\Util\Network;
 use Friendica\Util\Strings;
 use Friendica\Util\XML;
@@ -117,8 +120,8 @@ class DFRN
 		foreach ($items as $item) {
 			// These values aren't sent when sending from the queue.
 			/// @todo Check if we can set these values from the queue or if they are needed at all.
-			$item["entry:comment-allow"] = defaults($item, "entry:comment-allow", true);
-			$item["entry:cid"] = defaults($item, "entry:cid", 0);
+			$item["entry:comment-allow"] = ($item["entry:comment-allow"] ?? '') ?: true;
+			$item["entry:cid"] = $item["entry:cid"] ?? 0;
 
 			$entry = self::entry($doc, "text", $item, $owner, $item["entry:comment-allow"], $item["entry:cid"]);
 			if (isset($entry)) {
@@ -379,18 +382,18 @@ class DFRN
 		$type = 'html';
 
 		if ($conversation) {
-			$root = $doc->createElementNS(NAMESPACE_ATOM1, 'feed');
+			$root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 			$doc->appendChild($root);
 
-			$root->setAttribute("xmlns:thr", NAMESPACE_THREAD);
-			$root->setAttribute("xmlns:at", NAMESPACE_TOMB);
-			$root->setAttribute("xmlns:media", NAMESPACE_MEDIA);
-			$root->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
-			$root->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
-			$root->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
-			$root->setAttribute("xmlns:poco", NAMESPACE_POCO);
-			$root->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
-			$root->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
+			$root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
+			$root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
+			$root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
+			$root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
+			$root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
+			$root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
+			$root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
+			$root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
+			$root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 
 			//$root = self::addHeader($doc, $owner, "dfrn:owner", "", false);
 
@@ -502,7 +505,7 @@ class DFRN
 			$uid
 		);
 		$photos = [];
-		$ext = Image::supportedTypes();
+		$ext = Images::supportedTypes();
 
 		foreach ($rp as $p) {
 			$photos[$p['scale']] = System::baseUrl().'/photo/'.$p['resource-id'].'-'.$p['scale'].'.'.$ext[$p['type']];
@@ -554,18 +557,18 @@ class DFRN
 			$alternatelink = $owner['url'];
 		}
 
-		$root = $doc->createElementNS(NAMESPACE_ATOM1, 'feed');
+		$root = $doc->createElementNS(ActivityNamespace::ATOM1, 'feed');
 		$doc->appendChild($root);
 
-		$root->setAttribute("xmlns:thr", NAMESPACE_THREAD);
-		$root->setAttribute("xmlns:at", NAMESPACE_TOMB);
-		$root->setAttribute("xmlns:media", NAMESPACE_MEDIA);
-		$root->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
-		$root->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
-		$root->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
-		$root->setAttribute("xmlns:poco", NAMESPACE_POCO);
-		$root->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
-		$root->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
+		$root->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
+		$root->setAttribute("xmlns:at", ActivityNamespace::TOMB);
+		$root->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
+		$root->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
+		$root->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
+		$root->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
+		$root->setAttribute("xmlns:poco", ActivityNamespace::POCO);
+		$root->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
+		$root->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 
 		XML::addElement($doc, $root, "id", System::baseUrl()."/profile/".$owner["nick"]);
 		XML::addElement($doc, $root, "title", $owner["name"]);
@@ -938,18 +941,18 @@ class DFRN
 		if (!$single) {
 			$entry = $doc->createElement("entry");
 		} else {
-			$entry = $doc->createElementNS(NAMESPACE_ATOM1, 'entry');
+			$entry = $doc->createElementNS(ActivityNamespace::ATOM1, 'entry');
 			$doc->appendChild($entry);
 
-			$entry->setAttribute("xmlns:thr", NAMESPACE_THREAD);
-			$entry->setAttribute("xmlns:at", NAMESPACE_TOMB);
-			$entry->setAttribute("xmlns:media", NAMESPACE_MEDIA);
-			$entry->setAttribute("xmlns:dfrn", NAMESPACE_DFRN);
-			$entry->setAttribute("xmlns:activity", NAMESPACE_ACTIVITY);
-			$entry->setAttribute("xmlns:georss", NAMESPACE_GEORSS);
-			$entry->setAttribute("xmlns:poco", NAMESPACE_POCO);
-			$entry->setAttribute("xmlns:ostatus", NAMESPACE_OSTATUS);
-			$entry->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
+			$entry->setAttribute("xmlns:thr", ActivityNamespace::THREAD);
+			$entry->setAttribute("xmlns:at", ActivityNamespace::TOMB);
+			$entry->setAttribute("xmlns:media", ActivityNamespace::MEDIA);
+			$entry->setAttribute("xmlns:dfrn", ActivityNamespace::DFRN);
+			$entry->setAttribute("xmlns:activity", ActivityNamespace::ACTIVITY);
+			$entry->setAttribute("xmlns:georss", ActivityNamespace::GEORSS);
+			$entry->setAttribute("xmlns:poco", ActivityNamespace::POCO);
+			$entry->setAttribute("xmlns:ostatus", ActivityNamespace::OSTATUS);
+			$entry->setAttribute("xmlns:statusnet", ActivityNamespace::STATUSNET);
 		}
 
 		if ($item['private']) {
@@ -1076,9 +1079,9 @@ class DFRN
 		if ($item['object-type'] != "") {
 			XML::addElement($doc, $entry, "activity:object-type", $item['object-type']);
 		} elseif ($item['id'] == $item['parent']) {
-			XML::addElement($doc, $entry, "activity:object-type", ACTIVITY_OBJ_NOTE);
+			XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::NOTE);
 		} else {
-			XML::addElement($doc, $entry, "activity:object-type", ACTIVITY_OBJ_COMMENT);
+			XML::addElement($doc, $entry, "activity:object-type", Activity\ObjectType::COMMENT);
 		}
 
 		$actobj = self::createActivity($doc, "activity:object", $item['object']);
@@ -1121,7 +1124,7 @@ class DFRN
 					"link",
 					"",
 					["rel" => "mentioned",
-							"ostatus:object-type" => ACTIVITY_OBJ_GROUP,
+							"ostatus:object-type" => Activity\ObjectType::GROUP,
 							"href" => $mention]
 				);
 			} else {
@@ -1131,7 +1134,7 @@ class DFRN
 					"link",
 					"",
 					["rel" => "mentioned",
-							"ostatus:object-type" => ACTIVITY_OBJ_PERSON,
+							"ostatus:object-type" => Activity\ObjectType::PERSON,
 							"href" => $mention]
 				);
 			}
@@ -1257,7 +1260,7 @@ class DFRN
 		$sent_dfrn_id = hex2bin((string) $res->dfrn_id);
 		$challenge    = hex2bin((string) $res->challenge);
 		$perm         = (($res->perm) ? $res->perm : null);
-		$dfrn_version = (float) (($res->dfrn_version) ? $res->dfrn_version : 2.0);
+		$dfrn_version = floatval($res->dfrn_version ?: 2.0);
 		$rino_remote_version = intval($res->rino);
 		$page         = (($owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? 1 : 0);
 
@@ -1747,7 +1750,7 @@ class DFRN
 		$obj_doc = new DOMDocument("1.0", "utf-8");
 		$obj_doc->formatOutput = true;
 
-		$obj_element = $obj_doc->createElementNS(NAMESPACE_ATOM1, $element);
+		$obj_element = $obj_doc->createElementNS( ActivityNamespace::ATOM1, $element);
 
 		$activity_type = $xpath->query("activity:object-type/text()", $activity)->item(0)->nodeValue;
 		XML::addElement($obj_doc, $obj_element, "type", $activity_type);
@@ -1904,7 +1907,7 @@ class DFRN
 				'source_name'  => $importer['name'],
 				'source_link'  => $importer['url'],
 				'source_photo' => $importer['photo'],
-				'verb'         => ACTIVITY_REQ_FRIEND,
+				'verb'         => Activity::REQ_FRIEND,
 				'otype'        => 'intro']
 		);
 
@@ -2017,8 +2020,8 @@ class DFRN
 				return false;
 			}
 
-			$fields = ['title' => defaults($item, 'title', ''), 'body' => defaults($item, 'body', ''),
-					'tag' => defaults($item, 'tag', ''), 'changed' => DateTimeFormat::utcNow(),
+			$fields = ['title' => $item['title'] ?? '', 'body' => $item['body'] ?? '',
+					'tag' => $item['tag'] ?? '', 'changed' => DateTimeFormat::utcNow(),
 					'edited' => DateTimeFormat::utc($item["edited"])];
 
 			$condition = ["`uri` = ? AND `uid` IN (0, ?)", $item["uri"], $importer["importer_uid"]];
@@ -2114,7 +2117,7 @@ class DFRN
 		}
 		$xo = XML::parseString($item["object"], false);
 
-		if (($xo->type == ACTIVITY_OBJ_PERSON) && ($xo->id)) {
+		if (($xo->type == Activity\ObjectType::PERSON) && ($xo->id)) {
 			// somebody was poked/prodded. Was it me?
 			$Blink = '';
 			foreach ($xo->link as $l) {
@@ -2176,36 +2179,39 @@ class DFRN
 		if (($entrytype == DFRN::TOP_LEVEL) && !empty($importer['id'])) {
 			// The filling of the the "contact" variable is done for legcy reasons
 			// The functions below are partly used by ostatus.php as well - where we have this variable
-			$contact = Contact::select([], ['id' => $importer['id']]);
+			$contact = Contact::selectFirst([], ['id' => $importer['id']]);
+
+			/** @var Activity $activity */
+			$activity = BaseObject::getClass(Activity::class);
 
 			// Big question: Do we need these functions? They were part of the "consume_feed" function.
 			// This function once was responsible for DFRN and OStatus.
-			if (activity_match($item["verb"], ACTIVITY_FOLLOW)) {
+			if ($activity->match($item["verb"], Activity::FOLLOW)) {
 				Logger::log("New follower");
 				Contact::addRelationship($importer, $contact, $item);
 				return false;
 			}
-			if (activity_match($item["verb"], ACTIVITY_UNFOLLOW)) {
+			if ($activity->match($item["verb"], Activity::UNFOLLOW)) {
 				Logger::log("Lost follower");
 				Contact::removeFollower($importer, $contact, $item);
 				return false;
 			}
-			if (activity_match($item["verb"], ACTIVITY_REQ_FRIEND)) {
+			if ($activity->match($item["verb"], Activity::REQ_FRIEND)) {
 				Logger::log("New friend request");
 				Contact::addRelationship($importer, $contact, $item, true);
 				return false;
 			}
-			if (activity_match($item["verb"], ACTIVITY_UNFRIEND)) {
+			if ($activity->match($item["verb"], Activity::UNFRIEND)) {
 				Logger::log("Lost sharer");
 				Contact::removeSharer($importer, $contact, $item);
 				return false;
 			}
 		} else {
-			if (($item["verb"] == ACTIVITY_LIKE)
-				|| ($item["verb"] == ACTIVITY_DISLIKE)
-				|| ($item["verb"] == ACTIVITY_ATTEND)
-				|| ($item["verb"] == ACTIVITY_ATTENDNO)
-				|| ($item["verb"] == ACTIVITY_ATTENDMAYBE)
+			if (($item["verb"] == Activity::LIKE)
+				|| ($item["verb"] == Activity::DISLIKE)
+				|| ($item["verb"] == Activity::ATTEND)
+				|| ($item["verb"] == Activity::ATTENDNO)
+				|| ($item["verb"] == Activity::ATTENDMAYBE)
 			) {
 				$is_like = true;
 				$item["gravity"] = GRAVITY_ACTIVITY;
@@ -2232,11 +2238,11 @@ class DFRN
 				$is_like = false;
 			}
 
-			if (($item["verb"] == ACTIVITY_TAG) && ($item["object-type"] == ACTIVITY_OBJ_TAGTERM)) {
+			if (($item["verb"] == Activity::TAG) && ($item["object-type"] == Activity\ObjectType::TAGTERM)) {
 				$xo = XML::parseString($item["object"], false);
 				$xt = XML::parseString($item["target"], false);
 
-				if ($xt->type == ACTIVITY_OBJ_NOTE) {
+				if ($xt->type == Activity\ObjectType::NOTE) {
 					$item_tag = Item::selectFirst(['id', 'tag'], ['uri' => $xt->id, 'uid' => $importer["importer_uid"]]);
 
 					if (!DBA::isResult($item_tag)) {
@@ -2511,7 +2517,7 @@ class DFRN
 		// Now assign the rest of the values that depend on the type of the message
 		if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
 			if (!isset($item["object-type"])) {
-				$item["object-type"] = ACTIVITY_OBJ_COMMENT;
+				$item["object-type"] = Activity\ObjectType::COMMENT;
 			}
 
 			if ($item["contact-id"] != $owner["contact-id"]) {
@@ -2535,11 +2541,11 @@ class DFRN
 			$item["wall"] = 1;
 		} elseif ($entrytype == DFRN::TOP_LEVEL) {
 			if (!isset($item["object-type"])) {
-				$item["object-type"] = ACTIVITY_OBJ_NOTE;
+				$item["object-type"] = Activity\ObjectType::NOTE;
 			}
 
 			// Is it an event?
-			if (($item["object-type"] == ACTIVITY_OBJ_EVENT) && !$owner_unknown) {
+			if (($item["object-type"] == Activity\ObjectType::EVENT) && !$owner_unknown) {
 				Logger::log("Item ".$item["uri"]." seems to contain an event.", Logger::DEBUG);
 				$ev = Event::fromBBCode($item["body"]);
 				if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
@@ -2636,7 +2642,7 @@ class DFRN
 				Item::distribute($posted_id);
 			}
 
-			if (stristr($item["verb"], ACTIVITY_POKE)) {
+			if (stristr($item["verb"], Activity::POKE)) {
 				$item['id'] = $posted_id;
 				self::doPoke($item, $importer);
 			}
@@ -2725,16 +2731,16 @@ class DFRN
 		@$doc->loadXML($xml);
 
 		$xpath = new DOMXPath($doc);
-		$xpath->registerNamespace("atom", NAMESPACE_ATOM1);
-		$xpath->registerNamespace("thr", NAMESPACE_THREAD);
-		$xpath->registerNamespace("at", NAMESPACE_TOMB);
-		$xpath->registerNamespace("media", NAMESPACE_MEDIA);
-		$xpath->registerNamespace("dfrn", NAMESPACE_DFRN);
-		$xpath->registerNamespace("activity", NAMESPACE_ACTIVITY);
-		$xpath->registerNamespace("georss", NAMESPACE_GEORSS);
-		$xpath->registerNamespace("poco", NAMESPACE_POCO);
-		$xpath->registerNamespace("ostatus", NAMESPACE_OSTATUS);
-		$xpath->registerNamespace("statusnet", NAMESPACE_STATUSNET);
+		$xpath->registerNamespace("atom", ActivityNamespace::ATOM1);
+		$xpath->registerNamespace("thr", ActivityNamespace::THREAD);
+		$xpath->registerNamespace("at", ActivityNamespace::TOMB);
+		$xpath->registerNamespace("media", ActivityNamespace::MEDIA);
+		$xpath->registerNamespace("dfrn", ActivityNamespace::DFRN);
+		$xpath->registerNamespace("activity", ActivityNamespace::ACTIVITY);
+		$xpath->registerNamespace("georss", ActivityNamespace::GEORSS);
+		$xpath->registerNamespace("poco", ActivityNamespace::POCO);
+		$xpath->registerNamespace("ostatus", ActivityNamespace::OSTATUS);
+		$xpath->registerNamespace("statusnet", ActivityNamespace::STATUSNET);
 
 		$header = [];
 		$header["uid"] = $importer["importer_uid"];
@@ -2847,115 +2853,6 @@ class DFRN
 		return 200;
 	}
 
-	/**
-	 * @param App    $a            App
-	 * @param string $contact_nick contact nickname
-	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
-	 */
-	public static function autoRedir(App $a, $contact_nick)
-	{
-		// prevent looping
-		if (!empty($_REQUEST['redir'])) {
-			Logger::log('autoRedir might be looping because redirect has been redirected', Logger::DEBUG);
-			// looping prevention also appears to sometimes prevent authentication for images
-			// because browser may have multiple connections open and load an image on a connection
-			// whose session wasn't updated when a previous redirect authenticated
-			// Leaving commented in case looping reappears
-			//return;
-		}
-
-		if ((! $contact_nick) || ($contact_nick === $a->user['nickname'])) {
-			return;
-		}
-
-		if (local_user()) {
-			// We need to find out if $contact_nick is a user on this hub, and if so, if I
-			// am a contact of that user. However, that user may have other contacts with the
-			// same nickname as me on other hubs or other networks. Exclude these by requiring
-			// that the contact have a local URL. I will be the only person with my nickname at
-			// this URL, so if a result is found, then I am a contact of the $contact_nick user.
-			//
-			// We also have to make sure that I'm a legitimate contact--I'm not blocked or pending.
-
-			$baseurl = System::baseUrl();
-			$domain_st = strpos($baseurl, "://");
-			if ($domain_st === false) {
-				return;
-			}
-			$baseurl = substr($baseurl, $domain_st + 3);
-			$nurl = Strings::normaliseLink($baseurl);
-
-			$r = User::getByNickname($contact_nick, ["uid"]);
-			$contact_uid = $r["uid"];
-
-			/// @todo Why is there a query for "url" *and* "nurl"? Especially this normalising is strange.
-			$r = q("SELECT `id` FROM `contact` WHERE `uid` = (SELECT `uid` FROM `user` WHERE `nickname` = '%s' LIMIT 1)
-					AND `nick` = '%s' AND NOT `self` AND (`url` LIKE '%%%s%%' OR `nurl` LIKE '%%%s%%') AND NOT `blocked` AND NOT `pending` LIMIT 1",
-				DBA::escape($contact_nick),
-				DBA::escape($a->user['nickname']),
-				DBA::escape($baseurl),
-				DBA::escape($nurl)
-			);
-			if ((! DBA::isResult($r))) {
-				return;
-			}
-			// test if redirect authentication already succeeded
-			// Note that "contact" in the sense used in the $contact_nick argument to this function
-			// and the sense in the $remote[]["cid"] in the session are opposite.
-			// In the session variable the user currently fetching is the contact
-			// while $contact_nick is the nick of tho user who owns the stuff being fetched.
-			foreach (\Friendica\Core\Session::get('remote', []) as $visitor) {
-				if ($visitor['uid'] == $contact_uid && $visitor['cid'] == $r[0]['id']) {
-					return;
-				}
-			}
-
-			$r = q("SELECT * FROM contact WHERE nick = '%s'
-					AND network = '%s' AND uid = %d  AND url LIKE '%%%s%%' LIMIT 1",
-				DBA::escape($contact_nick),
-				DBA::escape(Protocol::DFRN),
-				intval(local_user()),
-				DBA::escape($baseurl)
-			);
-			if (! DBA::isResult($r)) {
-				return;
-			}
-
-			$cid = $r[0]['id'];
-
-			$dfrn_id = (($r[0]['issued-id']) ? $r[0]['issued-id'] : $r[0]['dfrn-id']);
-
-			if ($r[0]['duplex'] && $r[0]['issued-id']) {
-				$orig_id = $r[0]['issued-id'];
-				$dfrn_id = '1:' . $orig_id;
-			}
-			if ($r[0]['duplex'] && $r[0]['dfrn-id']) {
-				$orig_id = $r[0]['dfrn-id'];
-				$dfrn_id = '0:' . $orig_id;
-			}
-
-			// ensure that we've got a valid ID. There may be some edge cases with forums and non-duplex mode
-			// that may have triggered some of the "went to {profile/intro} and got an RSS feed" issues
-
-			if (strlen($dfrn_id) < 3) {
-				return;
-			}
-
-			$sec = Strings::getRandomHex();
-
-			DBA::insert('profile_check', ['uid' => local_user(), 'cid' => $cid, 'dfrn_id' => $dfrn_id, 'sec' => $sec, 'expire' => time() + 45]);
-
-			$url = curPageURL();
-
-			Logger::log('auto_redir: ' . $r[0]['name'] . ' ' . $sec, Logger::DEBUG);
-			$dest = (($url) ? '&destination_url=' . $url : '');
-			System::externalRedirect($r[0]['poll'] . '?dfrn_id=' . $dfrn_id
-				. '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&type=profile&sec=' . $sec . $dest);
-		}
-
-		return;
-	}
-
 	/**
 	 * @brief Returns the activity verb
 	 *
@@ -2968,7 +2865,7 @@ class DFRN
 		if ($item['verb']) {
 			return $item['verb'];
 		}
-		return ACTIVITY_POST;
+		return Activity::POST;
 	}
 
 	private static function tgroupCheck($uid, $item)
@@ -3041,4 +2938,19 @@ class DFRN
 
 		return (strcmp($existing_edited, $update_edited) < 0);
 	}
+
+	/**
+	 * Checks if the given contact url does support DFRN
+	 *
+	 * @param string  $url    profile url
+	 * @param boolean $update Update the profile
+	 * @return boolean
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+	 * @throws \ImagickException
+	 */
+	public static function isSupportedByContactUrl($url, $update = false)
+	{
+		$probe = Probe::uri($url, Protocol::DFRN, 0, !$update);
+		return $probe['network'] == Protocol::DFRN;
+	}
 }