]> git.mxchange.org Git - friendica.git/blobdiff - src/Protocol/DFRN.php
Move Object\Image static methods to Util\Images
[friendica.git] / src / Protocol / DFRN.php
index 5fceab3264d7ab9cc70056c7db2486db4c991124..0b6e02f096118ad37e98076193262a9a9ea59515 100644 (file)
@@ -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;
+       }
 }