]> git.mxchange.org Git - friendica.git/blobdiff - src/Model/Contact.php
Merge pull request #10446 from MrPetovan/bug/10439-addon-settings-forms
[friendica.git] / src / Model / Contact.php
index 3d3583b6bf70ad915ab80b1d7e817a27f7687b11..60213cacb51751f232c9b3067ef5b16b5317baa1 100644 (file)
@@ -1,6 +1,6 @@
 <?php
 /**
- * @copyright Copyright (C) 2020, Friendica
+ * @copyright Copyright (C) 2010-2021, the Friendica project
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -23,15 +23,17 @@ namespace Friendica\Model;
 
 use Friendica\App\BaseURL;
 use Friendica\Content\Pager;
+use Friendica\Content\Text\HTML;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
+use Friendica\Core\Renderer;
 use Friendica\Core\Session;
 use Friendica\Core\System;
 use Friendica\Core\Worker;
+use Friendica\Database\Database;
 use Friendica\Database\DBA;
 use Friendica\DI;
-use Friendica\Model\Notify\Type;
 use Friendica\Network\HTTPException;
 use Friendica\Network\Probe;
 use Friendica\Protocol\Activity;
@@ -89,6 +91,8 @@ class Contact
         * @}
         */
 
+       const LOCK_INSERT = 'contact-insert';
+
        /**
         * Account types
         *
@@ -126,6 +130,7 @@ class Contact
         * Relationship types
         * @{
         */
+       const NOTHING  = 0;
        const FOLLOWER = 1;
        const SHARING  = 2;
        const FRIEND   = 3;
@@ -133,7 +138,12 @@ class Contact
         * @}
         */
 
-       /**
+        const MIRROR_DEACTIVATED = 0;
+        const MIRROR_FORWARDED = 1;
+        const MIRROR_OWN_POST = 2;
+        const MIRROR_NATIVE_RESHARE = 3;
+
+        /**
         * @param array $fields    Array of selected fields, empty for all
         * @param array $condition Array of fields for condition
         * @param array $params    Array of several parameters
@@ -163,15 +173,23 @@ class Contact
         * Insert a row into the contact table
         * Important: You can't use DBA::lastInsertId() after this call since it will be set to 0.
         *
-        * @param array        $fields              field array
-        * @param bool         $on_duplicate_update Do an update on a duplicate entry
+        * @param array $fields         field array
+        * @param int   $duplicate_mode Do an update on a duplicate entry
         *
         * @return boolean was the insert successful?
         * @throws \Exception
         */
-       public static function insert(array $fields, bool $on_duplicate_update = false)
+       public static function insert(array $fields, int $duplicate_mode = Database::INSERT_DEFAULT)
        {
-               $ret = DBA::insert('contact', $fields, $on_duplicate_update);
+               if (!empty($fields['baseurl']) && empty($fields['gsid'])) {
+                       $fields['gsid'] = GServer::getID($fields['baseurl'], true);
+               }
+
+               if (empty($fields['created'])) {
+                       $fields['created'] = DateTimeFormat::utcNow();
+               }
+
+               $ret = DBA::insert('contact', $fields, $duplicate_mode);
                $contact = DBA::selectFirst('contact', ['nurl', 'uid'], ['id' => DBA::lastInsertId()]);
                if (!DBA::isResult($contact)) {
                        // Shouldn't happen
@@ -222,7 +240,7 @@ class Contact
                // Add internal fields
                $removal = [];
                if (!empty($fields)) {
-                       foreach (['id', 'avatar', 'updated', 'last-update', 'success_update', 'failure_update', 'network'] as $internal) {
+                       foreach (['id', 'avatar', 'created', 'updated', 'last-update', 'success_update', 'failure_update', 'network'] as $internal) {
                                if (!in_array($internal, $fields)) {
                                        $fields[] = $internal;
                                        $removal[] = $internal;
@@ -246,15 +264,14 @@ class Contact
                        $condition = ['`alias` IN (?, ?, ?) AND `uid` = ? AND NOT `deleted`', $url, Strings::normaliseLink($url), $ssl_url, $uid];
                        $contact = DBA::selectFirst('contact', $fields, $condition, $options);
                }
-               
+
                if (!DBA::isResult($contact)) {
                        return [];
                }
 
                // Update the contact in the background if needed
-               $updated = max($contact['success_update'], $contact['updated'], $contact['last-update'], $contact['failure_update']);
-               if ((($updated < DateTimeFormat::utc('now -7 days')) || empty($contact['avatar'])) &&
-                       in_array($contact['network'], Protocol::FEDERATED)) {
+               $updated = max($contact['success_update'], $contact['created'], $contact['updated'], $contact['last-update'], $contact['failure_update']);
+               if (($updated < DateTimeFormat::utc('now -7 days')) && in_array($contact['network'], Protocol::FEDERATED) && !self::isLocalById($contact['id'])) {
                        Worker::add(PRIORITY_LOW, "UpdateContact", $contact['id']);
                }
 
@@ -290,7 +307,7 @@ class Contact
                }
 
                $contact = self::getByURL($url, $update, $fields);
-               if (!empty($contact['id'])) {           
+               if (!empty($contact['id'])) {
                        $contact['cid'] = 0;
                        $contact['zid'] = $contact['id'];
                }
@@ -505,14 +522,14 @@ class Contact
                }
 
                if ($contact['uid'] != 0) {
-                       $pcid = Contact::getIdForURL($contact['url'], 0, false, ['url' => $contact['url']]);
+                       $pcid = self::getIdForURL($contact['url'], 0, false, ['url' => $contact['url']]);
                        if (empty($pcid)) {
                                return [];
                        }
                        $ucid = $contact['id'];
                } else {
                        $pcid = $contact['id'];
-                       $ucid = Contact::getIdForURL($contact['url'], $uid);
+                       $ucid = self::getIdForURL($contact['url'], $uid);
                }
 
                return ['public' => $pcid, 'user' => $ucid];
@@ -549,22 +566,20 @@ class Contact
         */
        public static function createSelfFromUserId($uid)
        {
-               // Only create the entry if it doesn't exist yet
-               if (DBA::exists('contact', ['uid' => $uid, 'self' => true])) {
-                       return true;
-               }
-
-               $user = DBA::selectFirst('user', ['uid', 'username', 'nickname'], ['uid' => $uid]);
+               $user = DBA::selectFirst('user', ['uid', 'username', 'nickname', 'pubkey', 'prvkey'],
+                       ['uid' => $uid, 'account_expired' => false]);
                if (!DBA::isResult($user)) {
                        return false;
                }
 
-               $return = DBA::insert('contact', [
+               $contact = [
                        'uid'         => $user['uid'],
                        'created'     => DateTimeFormat::utcNow(),
                        'self'        => 1,
                        'name'        => $user['username'],
                        'nick'        => $user['nickname'],
+                       'pubkey'      => $user['pubkey'],
+                       'prvkey'      => $user['prvkey'],
                        'photo'       => DI::baseUrl() . '/photo/profile/' . $user['uid'] . '.jpg',
                        'thumb'       => DI::baseUrl() . '/photo/avatar/'  . $user['uid'] . '.jpg',
                        'micro'       => DI::baseUrl() . '/photo/micro/'   . $user['uid'] . '.jpg',
@@ -582,7 +597,23 @@ class Contact
                        'uri-date'    => DateTimeFormat::utcNow(),
                        'avatar-date' => DateTimeFormat::utcNow(),
                        'closeness'   => 0
-               ]);
+               ];
+
+               $return = true;
+
+               // Only create the entry if it doesn't exist yet
+               if (!DBA::exists('contact', ['uid' => $uid, 'self' => true])) {
+                       $return = DBA::insert('contact', $contact);
+               }
+
+               // Create the public contact
+               if (!DBA::exists('contact', ['nurl' => $contact['nurl'], 'uid' => 0])) {
+                       $contact['self']   = false;
+                       $contact['uid']    = 0;
+                       $contact['prvkey'] = null;
+
+                       DBA::insert('contact', $contact, Database::INSERT_IGNORE);
+               }
 
                return $return;
        }
@@ -592,29 +623,30 @@ class Contact
         *
         * @param int     $uid
         * @param boolean $update_avatar Force the avatar update
+        * @return bool   "true" if updated
         * @throws HTTPException\InternalServerErrorException
         */
        public static function updateSelfFromUserID($uid, $update_avatar = false)
        {
-               $fields = ['id', 'name', 'nick', 'location', 'about', 'keywords', 'avatar',
+               $fields = ['id', 'name', 'nick', 'location', 'about', 'keywords', 'avatar', 'prvkey', 'pubkey',
                        'xmpp', 'contact-type', 'forum', 'prv', 'avatar-date', 'url', 'nurl', 'unsearchable',
                        'photo', 'thumb', 'micro', 'addr', 'request', 'notify', 'poll', 'confirm', 'poco'];
                $self = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
                if (!DBA::isResult($self)) {
-                       return;
+                       return false;
                }
 
-               $fields = ['nickname', 'page-flags', 'account-type'];
-               $user = DBA::selectFirst('user', $fields, ['uid' => $uid]);
+               $fields = ['nickname', 'page-flags', 'account-type', 'prvkey', 'pubkey'];
+               $user = DBA::selectFirst('user', $fields, ['uid' => $uid, 'account_expired' => false]);
                if (!DBA::isResult($user)) {
-                       return;
+                       return false;
                }
 
                $fields = ['name', 'photo', 'thumb', 'about', 'address', 'locality', 'region',
                        'country-name', 'pub_keywords', 'xmpp', 'net-publish'];
                $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid]);
                if (!DBA::isResult($profile)) {
-                       return;
+                       return false;
                }
 
                $file_suffix = 'jpg';
@@ -622,8 +654,18 @@ class Contact
                $fields = ['name' => $profile['name'], 'nick' => $user['nickname'],
                        'avatar-date' => $self['avatar-date'], 'location' => Profile::formatLocation($profile),
                        'about' => $profile['about'], 'keywords' => $profile['pub_keywords'],
-                       'contact-type' => $user['account-type'],
-                       'xmpp' => $profile['xmpp']];
+                       'contact-type' => $user['account-type'], 'prvkey' => $user['prvkey'],
+                       'pubkey' => $user['pubkey'], 'xmpp' => $profile['xmpp']];
+
+               // it seems as if ported accounts can have wrong values, so we make sure that now everything is fine.
+               $fields['url'] = DI::baseUrl() . '/profile/' . $user['nickname'];
+               $fields['nurl'] = Strings::normaliseLink($fields['url']);
+               $fields['addr'] = $user['nickname'] . '@' . substr(DI::baseUrl(), strpos(DI::baseUrl(), '://') + 3);
+               $fields['request'] = DI::baseUrl() . '/dfrn_request/' . $user['nickname'];
+               $fields['notify'] = DI::baseUrl() . '/dfrn_notify/' . $user['nickname'];
+               $fields['poll'] = DI::baseUrl() . '/dfrn_poll/'. $user['nickname'];
+               $fields['confirm'] = DI::baseUrl() . '/dfrn_confirm/' . $user['nickname'];
+               $fields['poco'] = DI::baseUrl() . '/poco/' . $user['nickname'];
 
                $avatar = Photo::selectFirst(['resource-id', 'type'], ['uid' => $uid, 'profile' => true]);
                if (DBA::isResult($avatar)) {
@@ -648,9 +690,9 @@ class Contact
                        $fields['micro'] = $prefix . '6' . $suffix;
                } else {
                        // We hadn't found a photo entry, so we use the default avatar
-                       $fields['photo'] = DI::baseUrl() . self::DEFAULT_AVATAR_PHOTO;
-                       $fields['thumb'] = DI::baseUrl() . self::DEFAULT_AVATAR_THUMB;
-                       $fields['micro'] = DI::baseUrl() . self::DEFAULT_AVATAR_MICRO;
+                       $fields['photo'] = self::getDefaultAvatar($fields, Proxy::SIZE_SMALL);
+                       $fields['thumb'] = self::getDefaultAvatar($fields, Proxy::SIZE_THUMB);
+                       $fields['micro'] = self::getDefaultAvatar($fields, Proxy::SIZE_MICRO);
                }
 
                $fields['avatar'] = DI::baseUrl() . '/photo/profile/' .$uid . '.' . $file_suffix;
@@ -658,16 +700,6 @@ class Contact
                $fields['prv'] = $user['page-flags'] == User::PAGE_FLAGS_PRVGROUP;
                $fields['unsearchable'] = !$profile['net-publish'];
 
-               // it seems as if ported accounts can have wrong values, so we make sure that now everything is fine.
-               $fields['url'] = DI::baseUrl() . '/profile/' . $user['nickname'];
-               $fields['nurl'] = Strings::normaliseLink($fields['url']);
-               $fields['addr'] = $user['nickname'] . '@' . substr(DI::baseUrl(), strpos(DI::baseUrl(), '://') + 3);
-               $fields['request'] = DI::baseUrl() . '/dfrn_request/' . $user['nickname'];
-               $fields['notify'] = DI::baseUrl() . '/dfrn_notify/' . $user['nickname'];
-               $fields['poll'] = DI::baseUrl() . '/dfrn_poll/'. $user['nickname'];
-               $fields['confirm'] = DI::baseUrl() . '/dfrn_confirm/' . $user['nickname'];
-               $fields['poco'] = DI::baseUrl() . '/poco/' . $user['nickname'];
-
                $update = false;
 
                foreach ($fields as $field => $content) {
@@ -684,6 +716,8 @@ class Contact
                        DBA::update('contact', $fields, ['id' => $self['id']]);
 
                        // Update the public contact as well
+                       $fields['prvkey'] = null;
+                       $fields['self']   = false;
                        DBA::update('contact', $fields, ['uid' => 0, 'nurl' => $self['nurl']]);
 
                        // Update the profile
@@ -691,6 +725,8 @@ class Contact
                                'thumb' => DI::baseUrl() . '/photo/avatar/' . $uid .'.' . $file_suffix];
                        DBA::update('profile', $fields, ['uid' => $uid]);
                }
+
+               return $update;
        }
 
        /**
@@ -704,7 +740,7 @@ class Contact
        {
                // We want just to make sure that we don't delete our "self" contact
                $contact = DBA::selectFirst('contact', ['uid'], ['id' => $id, 'self' => false]);
-               if (!DBA::isResult($contact) || !intval($contact['uid'])) {
+               if (!DBA::isResult($contact)) {
                        return;
                }
 
@@ -748,7 +784,6 @@ class Contact
                        $item['title'] = '';
                        $item['guid'] = '';
                        $item['uri-id'] = 0;
-                       $item['attach'] = '';
                        $slap = OStatus::salmon($item, $user);
 
                        if (!empty($contact['notify'])) {
@@ -790,7 +825,7 @@ class Contact
                        Logger::info('Empty contact', ['contact' => $contact, 'callstack' => System::callstack(20)]);
                }
 
-               Logger::info('Contact is marked for archival', ['id' => $contact['id']]);
+               Logger::info('Contact is marked for archival', ['id' => $contact['id'], 'term-date' => $contact['term-date']]);
 
                // Contact already archived or "self" contact? => nothing to do
                if ($contact['archive'] || $contact['self']) {
@@ -837,7 +872,9 @@ class Contact
                if (!empty($contact['batch']) && !empty($contact['term-date']) && ($contact['term-date'] > DBA::NULL_DATETIME)) {
                        $fields = ['failed' => false, 'term-date' => DBA::NULL_DATETIME, 'archive' => false];
                        $condition = ['uid' => 0, 'network' => Protocol::FEDERATED, 'batch' => $contact['batch'], 'contact-type' => self::TYPE_RELAY];
-                       DBA::update('contact', $fields, $condition);
+                       if (!DBA::exists('contact', array_merge($condition, $fields))) {
+                               DBA::update('contact', $fields, $condition);
+                       }
                }
 
                $condition = ['`id` = ? AND (`term-date` > ? OR `archive`)', $contact['id'], DBA::NULL_DATETIME];
@@ -848,7 +885,7 @@ class Contact
                        return;
                }
 
-               Logger::info('Contact is marked as vital again', ['id' => $contact['id']]);
+               Logger::info('Contact is marked as vital again', ['id' => $contact['id'], 'term-date' => $contact['term-date']]);
 
                if (!isset($contact['url']) && !empty($contact['id'])) {
                        $fields = ['id', 'url', 'batch'];
@@ -887,7 +924,7 @@ class Contact
 
                if (empty($contact['uid']) || ($contact['uid'] != $uid)) {
                        if ($uid == 0) {
-                               $profile_link = self::magicLink($contact['url']);
+                               $profile_link = self::magicLinkByContact($contact);
                                $menu = ['profile' => [DI::l10n()->t('View Profile'), $profile_link, true]];
 
                                return $menu;
@@ -938,9 +975,9 @@ class Contact
                $unfollow_link = '';
                if (!$contact['self'] && in_array($contact['network'], Protocol::NATIVE_SUPPORT)) {
                        if ($contact['uid'] && in_array($contact['rel'], [self::SHARING, self::FRIEND])) {
-                               $unfollow_link = 'unfollow?url=' . urlencode($contact['url']);
+                               $unfollow_link = 'unfollow?url=' . urlencode($contact['url']) . '&auto=1';
                        } elseif(!$contact['pending']) {
-                               $follow_link = 'follow?url=' . urlencode($contact['url']);
+                               $follow_link = 'follow?url=' . urlencode($contact['url']) . '&auto=1';
                        }
                }
 
@@ -1066,7 +1103,7 @@ class Contact
                if (($uid == 0) && (empty($data['network']) || ($data['network'] == Protocol::PHANTOM))) {
                        // Fetch data for the public contact via the first found personal contact
                        /// @todo Check if this case can happen at all (possibly with mail accounts?)
-                       $fields = ['name', 'nick', 'url', 'addr', 'alias', 'avatar', 'contact-type',
+                       $fields = ['name', 'nick', 'url', 'addr', 'alias', 'avatar', 'header', 'contact-type',
                                'keywords', 'location', 'about', 'unsearchable', 'batch', 'notify', 'poll',
                                'request', 'confirm', 'poco', 'subscribe', 'network', 'baseurl', 'gsid'];
 
@@ -1100,7 +1137,7 @@ class Contact
                        $contact = self::selectFirst(['id'], ['nurl' => $urls, 'uid' => $uid]);
                        if (!empty($contact['id'])) {
                                $contact_id = $contact['id'];
-                               Logger::info('Fetched id by url', ['cid' => $contact_id, 'uid' => $uid, 'url' => $url, 'probed_url' => $data['url'], 'alias' => $data['alias'], 'addr' => $data['addr']]);
+                               Logger::info('Fetched id by url', ['cid' => $contact_id, 'uid' => $uid, 'url' => $url, 'data' => $data]);
                        }
                }
 
@@ -1121,19 +1158,23 @@ class Contact
                        $condition = ['nurl' => Strings::normaliseLink($data["url"]), 'uid' => $uid, 'deleted' => false];
 
                        // Before inserting we do check if the entry does exist now.
-                       DBA::lock('contact');
-                       $contact = DBA::selectFirst('contact', ['id'], $condition, ['order' => ['id']]);
-                       if (DBA::isResult($contact)) {
-                               $contact_id = $contact['id'];
-                               Logger::notice('Contact had been created (shortly) before', ['id' => $contact_id, 'url' => $url, 'uid' => $uid]);
-                       } else {
-                               DBA::insert('contact', $fields);
-                               $contact_id = DBA::lastInsertId();
-                               if ($contact_id) {
-                                       Logger::info('Contact inserted', ['id' => $contact_id, 'url' => $url, 'uid' => $uid]);
+                       if (DI::lock()->acquire(self::LOCK_INSERT, 0)) {
+                               $contact = DBA::selectFirst('contact', ['id'], $condition, ['order' => ['id']]);
+                               if (DBA::isResult($contact)) {
+                                       $contact_id = $contact['id'];
+                                       Logger::notice('Contact had been created (shortly) before', ['id' => $contact_id, 'url' => $url, 'uid' => $uid]);
+                               } else {
+                                       DBA::insert('contact', $fields);
+                                       $contact_id = DBA::lastInsertId();
+                                       if ($contact_id) {
+                                               Logger::info('Contact inserted', ['id' => $contact_id, 'url' => $url, 'uid' => $uid]);
+                                       }
                                }
+                               DI::lock()->release(self::LOCK_INSERT);
+                       } else {
+                               Logger::warning('Contact lock had not been acquired');
                        }
-                       DBA::unlock();
+
                        if (!$contact_id) {
                                Logger::info('Contact was not inserted', ['url' => $url, 'uid' => $uid]);
                                return 0;
@@ -1144,6 +1185,12 @@ class Contact
 
                self::updateFromProbeArray($contact_id, $data);
 
+               // Don't return a number for a deleted account
+               if (!empty($data['account-type']) && $data['account-type'] == User::ACCOUNT_TYPE_DELETED) {
+                       Logger::info('Contact is a tombstone', ['url' => $url, 'uid' => $uid]);
+                       return 0;
+               }
+
                return $contact_id;
        }
 
@@ -1243,25 +1290,27 @@ class Contact
         *
         * @param string $contact_url Contact URL
         * @param bool   $thread_mode
-        * @param int    $update
+        * @param int    $update      Update mode
+        * @param int    $parent      Item parent ID for the update mode
         * @return string posts in HTML
         * @throws \Exception
         */
-       public static function getPostsFromUrl($contact_url, $thread_mode = false, $update = 0)
+       public static function getPostsFromUrl($contact_url, $thread_mode = false, $update = 0, $parent = 0)
        {
-               return self::getPostsFromId(self::getIdForURL($contact_url), $thread_mode, $update);
+               return self::getPostsFromId(self::getIdForURL($contact_url), $thread_mode, $update, $parent);
        }
 
        /**
         * Returns posts from a given contact id
         *
-        * @param integer $cid
-        * @param bool    $thread_mode
-        * @param integer $update
+        * @param int  $cid         Contact ID
+        * @param bool $thread_mode
+        * @param int  $update      Update mode
+        * @param int  $parent     Item parent ID for the update mode
         * @return string posts in HTML
         * @throws \Exception
         */
-       public static function getPostsFromId($cid, $thread_mode = false, $update = 0)
+       public static function getPostsFromId($cid, $thread_mode = false, $update = 0, $parent = 0)
        {
                $a = DI::app();
 
@@ -1271,21 +1320,30 @@ class Contact
                }
 
                if (empty($contact["network"]) || in_array($contact["network"], Protocol::FEDERATED)) {
-                       $sql = "(`item`.`uid` = 0 OR (`item`.`uid` = ? AND NOT `item`.`global`))";
+                       $sql = "(`uid` = 0 OR (`uid` = ? AND NOT `global`))";
                } else {
-                       $sql = "`item`.`uid` = ?";
+                       $sql = "`uid` = ?";
                }
 
                $contact_field = ((($contact["contact-type"] == self::TYPE_COMMUNITY) || ($contact['network'] == Protocol::MAIL)) ? 'owner-id' : 'author-id');
 
                if ($thread_mode) {
-                       $condition = ["`$contact_field` = ? AND (`gravity` = ? OR (`gravity` = ? AND `vid` = ?)) AND " . $sql,
-                               $cid, GRAVITY_PARENT, GRAVITY_ACTIVITY, Verb::getID(Activity::ANNOUNCE), local_user()];
+                       $condition = ["((`$contact_field` = ? AND `gravity` = ?) OR (`author-id` = ? AND `gravity` = ? AND `vid` = ?)) AND " . $sql,
+                               $cid, GRAVITY_PARENT, $cid, GRAVITY_ACTIVITY, Verb::getID(Activity::ANNOUNCE), local_user()];
                } else {
                        $condition = ["`$contact_field` = ? AND `gravity` IN (?, ?) AND " . $sql,
                                $cid, GRAVITY_PARENT, GRAVITY_COMMENT, local_user()];
                }
 
+               if (!empty($parent)) {
+                       $condition = DBA::mergeConditions($condition, ['parent' => $parent]);
+               } else {
+                       $last_received = isset($_GET['last_received']) ? DateTimeFormat::utc($_GET['last_received']) : '';
+                       if (!empty($last_received)) {
+                               $condition = DBA::mergeConditions($condition, ["`received` < ?", $last_received]);
+                       }
+               }
+
                if (DI::mode()->isMobile()) {
                        $itemsPerPage = DI::pConfig()->get(local_user(), 'system', 'itemspage_mobile_network',
                                DI::config()->get('system', 'itemspage_network_mobile'));
@@ -1296,34 +1354,31 @@ class Contact
 
                $pager = new Pager(DI::l10n(), DI::args()->getQueryString(), $itemsPerPage);
 
-               $params = ['order' => ['received' => true],
-                       'limit' => [$pager->getStart(), $pager->getItemsPerPage()]];
+               $params = ['order' => ['received' => true], 'limit' => [$pager->getStart(), $pager->getItemsPerPage()]];
+
+               if (DI::pConfig()->get(local_user(), 'system', 'infinite_scroll')) {
+                       $tpl = Renderer::getMarkupTemplate('infinite_scroll_head.tpl');
+                       $o = Renderer::replaceMacros($tpl, ['$reload_uri' => DI::args()->getQueryString()]);
+               } else {
+                       $o = '';
+               }
 
                if ($thread_mode) {
-                       $r = Item::selectForUser(local_user(), ['uri', 'gravity', 'parent-uri'], $condition, $params);
-                       $items = [];
-                       while ($item = DBA::fetch($r)) {
-                               if ($item['gravity'] != GRAVITY_PARENT) {
-                                       $item['uri'] = $item['parent-uri'];
-                               }
-                               unset($item['parent-uri']);
-                               unset($item['gravity']);
-                               
-                               $items[] = $item;
-                       }
-                       DBA::close($r);
+                       $items = Post::toArray(Post::selectForUser(local_user(), ['uri-id', 'gravity', 'parent-uri-id', 'thr-parent-id', 'author-id'], $condition, $params));
 
-                       $o = conversation($a, $items, 'contacts', $update, false, 'commented', local_user());
+                       $o .= conversation($a, $items, 'contacts', $update, false, 'commented', local_user());
                } else {
-                       $r = Item::selectForUser(local_user(), [], $condition, $params);
-
-                       $items = Item::inArray($r);
+                       $items = Post::toArray(Post::selectForUser(local_user(), Item::DISPLAY_FIELDLIST, $condition, $params));
 
-                       $o = conversation($a, $items, 'contact-posts', false);
+                       $o .= conversation($a, $items, 'contact-posts', $update);
                }
 
                if (!$update) {
-                       $o .= $pager->renderMinimal(count($items));
+                       if (DI::pConfig()->get(local_user(), 'system', 'infinite_scroll')) {
+                               $o .= HTML::scrollLoader();
+                       } else {
+                               $o .= $pager->renderMinimal(count($items));
+                       }
                }
 
                return $o;
@@ -1435,24 +1490,28 @@ class Contact
        /**
         * Return the photo path for a given contact array in the given size
         *
-        * @param array $contact  contact array
-        * @param string $field   Fieldname of the photo in the contact array
-        * @param string $default Default path when no picture had been found
-        * @param string $size    Size of the avatar picture
-        * @param string $avatar  Avatar path that is displayed when no photo had been found
+        * @param array $contact    contact array
+        * @param string $field     Fieldname of the photo in the contact array
+        * @param string $size      Size of the avatar picture
+        * @param string $avatar    Avatar path that is displayed when no photo had been found
+        * @param bool  $no_update Don't perfom an update if no cached avatar was found
         * @return string photo path
         */
-       private static function getAvatarPath(array $contact, string $field, string $default, string $size, string $avatar)
+       private static function getAvatarPath(array $contact, string $field, string $size, string $avatar, $no_update = false)
        {
                if (!empty($contact)) {
-                       $contact = self::checkAvatarCacheByArray($contact);
+                       $contact = self::checkAvatarCacheByArray($contact, $no_update);
                        if (!empty($contact[$field])) {
-                               $avatar = $contact[$field];
+                               return $contact[$field];
+                       } elseif (!empty($contact['id'])) {
+                               return self::getAvatarUrlForId($contact['id'], $size, $contact['updated'] ?? '');
+                       } elseif (!empty($contact['avatar'])) {
+                               $avatar = $contact['avatar'];
                        }
                }
 
                if (empty($avatar)) {
-                       return $default;
+                       $avatar = self::getDefaultAvatar([], $size);
                }
 
                if (Proxy::isLocalImage($avatar)) {
@@ -1465,46 +1524,50 @@ class Contact
        /**
         * Return the photo path for a given contact array
         *
-        * @param array $contact Contact array
-        * @param string $avatar  Avatar path that is displayed when no photo had been found
+        * @param array  $contact   Contact array
+        * @param string $avatar    Avatar path that is displayed when no photo had been found
+        * @param bool   $no_update Don't perfom an update if no cached avatar was found
         * @return string photo path
         */
-       public static function getPhoto(array $contact, string $avatar = '')
+       public static function getPhoto(array $contact, string $avatar = '', bool $no_update = false)
        {
-               return self::getAvatarPath($contact, 'photo', DI::baseUrl() . self::DEFAULT_AVATAR_PHOTO, Proxy::SIZE_SMALL, $avatar);
+               return self::getAvatarPath($contact, 'photo', Proxy::SIZE_SMALL, $avatar, $no_update);
        }
 
        /**
         * Return the photo path (thumb size) for a given contact array
         *
-        * @param array $contact Contact array
-        * @param string $avatar  Avatar path that is displayed when no photo had been found
+        * @param array  $contact   Contact array
+        * @param string $avatar    Avatar path that is displayed when no photo had been found
+        * @param bool   $no_update Don't perfom an update if no cached avatar was found
         * @return string photo path
         */
-       public static function getThumb(array $contact, string $avatar = '')
+       public static function getThumb(array $contact, string $avatar = '', bool $no_update = false)
        {
-               return self::getAvatarPath($contact, 'thumb', DI::baseUrl() . self::DEFAULT_AVATAR_THUMB, Proxy::SIZE_THUMB, $avatar);
+               return self::getAvatarPath($contact, 'thumb', Proxy::SIZE_THUMB, $avatar, $no_update);
        }
 
        /**
         * Return the photo path (micro size) for a given contact array
         *
-        * @param array $contact Contact array
-        * @param string $avatar  Avatar path that is displayed when no photo had been found
+        * @param array  $contact   Contact array
+        * @param string $avatar    Avatar path that is displayed when no photo had been found
+        * @param bool   $no_update Don't perfom an update if no cached avatar was found
         * @return string photo path
         */
-       public static function getMicro(array $contact, string $avatar = '')
+       public static function getMicro(array $contact, string $avatar = '', bool $no_update = false)
        {
-               return self::getAvatarPath($contact, 'micro', DI::baseUrl() . self::DEFAULT_AVATAR_MICRO, Proxy::SIZE_MICRO, $avatar);
+               return self::getAvatarPath($contact, 'micro', Proxy::SIZE_MICRO, $avatar, $no_update);
        }
 
        /**
         * Check the given contact array for avatar cache fields
         *
         * @param array $contact
+        * @param bool  $no_update Don't perfom an update if no cached avatar was found
         * @return array contact array with avatar cache fields
         */
-       private static function checkAvatarCacheByArray(array $contact)
+       private static function checkAvatarCacheByArray(array $contact, bool $no_update = false)
        {
                $update = false;
                $contact_fields = [];
@@ -1518,7 +1581,7 @@ class Contact
                        }
                }
 
-               if (!$update) {
+               if (!$update || $no_update) {
                        return $contact;
                }
 
@@ -1534,18 +1597,164 @@ class Contact
 
                /// add the default avatars if the fields aren't filled
                if (isset($contact['photo']) && empty($contact['photo'])) {
-                       $contact['photo'] = DI::baseUrl() . self::DEFAULT_AVATAR_PHOTO;
+                       $contact['photo'] = self::getDefaultAvatar($contact, Proxy::SIZE_SMALL);
                }
                if (isset($contact['thumb']) && empty($contact['thumb'])) {
-                       $contact['thumb'] = DI::baseUrl() . self::DEFAULT_AVATAR_THUMB;
+                       $contact['thumb'] = self::getDefaultAvatar($contact, Proxy::SIZE_THUMB);
                }
                if (isset($contact['micro']) && empty($contact['micro'])) {
-                       $contact['micro'] = DI::baseUrl() . self::DEFAULT_AVATAR_MICRO;
+                       $contact['micro'] = self::getDefaultAvatar($contact, Proxy::SIZE_MICRO);
                }
 
                return $contact;
        }
 
+       /**
+        * Fetch the default avatar for the given contact and size
+        *
+        * @param array $contact  contact array
+        * @param string $size    Size of the avatar picture
+        * @return string avatar URL
+        */
+       public static function getDefaultAvatar(array $contact, string $size)
+       {
+               switch ($size) {
+                       case Proxy::SIZE_MICRO:
+                               $avatar['size'] = 48;
+                               $default = self::DEFAULT_AVATAR_MICRO;
+                               break;
+
+                       case Proxy::SIZE_THUMB:
+                               $avatar['size'] = 80;
+                               $default = self::DEFAULT_AVATAR_THUMB;
+                               break;
+
+                       case Proxy::SIZE_SMALL:
+                       default:
+                               $avatar['size'] = 300;
+                               $default = self::DEFAULT_AVATAR_PHOTO;
+                               break;
+               }
+
+               if (!DI::config()->get('system', 'remote_avatar_lookup')) {
+                       return DI::baseUrl() . $default;
+               }
+
+               if (!empty($contact['xmpp'])) {
+                       $avatar['email'] = $contact['xmpp'];
+               } elseif (!empty($contact['addr'])) {
+                       $avatar['email'] = $contact['addr'];
+               } elseif (!empty($contact['url'])) {
+                       $avatar['email'] = $contact['url'];
+               } else {
+                       return DI::baseUrl() . $default;
+               }
+
+               $avatar['url'] = '';
+               $avatar['success'] = false;
+
+               Hook::callAll('avatar_lookup', $avatar);
+
+               if ($avatar['success'] && !empty($avatar['url'])) {
+                       return $avatar['url'];
+               }
+
+               return DI::baseUrl() . $default;
+       }
+
+       /**
+        * Get avatar link for given contact id
+        *
+        * @param integer $cid     contact id
+        * @param string  $size    One of the ProxyUtils::SIZE_* constants
+        * @param string  $updated Contact update date
+        * @return string avatar link
+        */
+       public static function getAvatarUrlForId(int $cid, string $size = '', string $updated = ''):string
+       {
+               // We have to fetch the "updated" variable when it wasn't provided
+               // The parameter can be provided to improve performance
+               if (empty($updated)) {
+                       $contact = self::getById($cid, ['updated']);
+                       $updated = $contact['updated'] ?? '';
+               }
+
+               $url = DI::baseUrl() . '/photo/contact/';
+               switch ($size) {
+                       case Proxy::SIZE_MICRO:
+                               $url .= Proxy::PIXEL_MICRO . '/';
+                               break;
+                       case Proxy::SIZE_THUMB:
+                               $url .= Proxy::PIXEL_THUMB . '/';
+                               break;
+                       case Proxy::SIZE_SMALL:
+                               $url .= Proxy::PIXEL_SMALL . '/';
+                               break;
+                       case Proxy::SIZE_MEDIUM:
+                               $url .= Proxy::PIXEL_MEDIUM . '/';
+                               break;
+                       case Proxy::SIZE_LARGE:
+                               $url .= Proxy::PIXEL_LARGE . '/';
+                               break;
+               }
+               return $url . $cid . ($updated ? '?ts=' . strtotime($updated) : '');
+       }
+
+       /**
+        * Get avatar link for given contact URL
+        *
+        * @param string  $url  contact url
+        * @param integer $uid  user id
+        * @param string  $size One of the ProxyUtils::SIZE_* constants
+        * @return string avatar link
+        */
+       public static function getAvatarUrlForUrl(string $url, int $uid, string $size = ''):string
+       {
+               $condition = ["`nurl` = ? AND ((`uid` = ? AND `network` IN (?, ?)) OR `uid` = ?)",
+                       Strings::normaliseLink($url), $uid, Protocol::FEED, Protocol::MAIL, 0];
+               $contact = self::selectFirst(['id', 'updated'], $condition);
+               return self::getAvatarUrlForId($contact['id'] ?? 0, $size, $contact['updated']);
+       }
+
+       /**
+        * Get header link for given contact id
+        *
+        * @param integer $cid     contact id
+        * @param string  $size    One of the ProxyUtils::SIZE_* constants
+        * @param string  $updated Contact update date
+        * @return string header link
+        */
+       public static function getHeaderUrlForId(int $cid, string $size = '', string $updated = ''):string
+       {
+               // We have to fetch the "updated" variable when it wasn't provided
+               // The parameter can be provided to improve performance
+               if (empty($updated)) {
+                       $contact = self::getById($cid, ['updated']);
+                       $updated = $contact['updated'] ?? '';
+               }
+
+               $url = DI::baseUrl() . '/photo/header/';
+               switch ($size) {
+                       case Proxy::SIZE_MICRO:
+                               $url .= Proxy::PIXEL_MICRO . '/';
+                               break;
+                       case Proxy::SIZE_THUMB:
+                               $url .= Proxy::PIXEL_THUMB . '/';
+                               break;
+                       case Proxy::SIZE_SMALL:
+                               $url .= Proxy::PIXEL_SMALL . '/';
+                               break;
+                       case Proxy::SIZE_MEDIUM:
+                               $url .= Proxy::PIXEL_MEDIUM . '/';
+                               break;
+                       case Proxy::SIZE_LARGE:
+                               $url .= Proxy::PIXEL_LARGE . '/';
+                               break;
+               }
+
+               return $url . $cid . ($updated ? '?ts=' . strtotime($updated) : '');
+       }
+
        /**
         * Updates the avatar links in a contact only if needed
         *
@@ -1561,7 +1770,8 @@ class Contact
         */
        public static function updateAvatar(int $cid, string $avatar, bool $force = false, bool $create_cache = false)
        {
-               $contact = DBA::selectFirst('contact', ['uid', 'avatar', 'photo', 'thumb', 'micro', 'nurl', 'url', 'network'], ['id' => $cid, 'self' => false]);
+               $contact = DBA::selectFirst('contact', ['uid', 'avatar', 'photo', 'thumb', 'micro', 'xmpp', 'addr', 'nurl', 'url', 'network'],
+                       ['id' => $cid, 'self' => false]);
                if (!DBA::isResult($contact)) {
                        return;
                }
@@ -1586,13 +1796,18 @@ class Contact
                                return;
                        }
                }
-               
-               // Replace cached avatar pictures from the default avatar with the default avatars in different sizes
-               if (strpos($avatar, self::DEFAULT_AVATAR_PHOTO)) {
+
+               $default_avatar = empty($avatar) || strpos($avatar, self::DEFAULT_AVATAR_PHOTO);
+
+               if ($default_avatar) {
+                       $avatar = self::getDefaultAvatar($contact, Proxy::SIZE_SMALL);
+               }
+
+               if ($default_avatar && Proxy::isLocalImage($avatar)) {
                        $fields = ['avatar' => $avatar, 'avatar-date' => DateTimeFormat::utcNow(),
-                               'photo' => DI::baseUrl() . self::DEFAULT_AVATAR_PHOTO,
-                               'thumb' => DI::baseUrl() . self::DEFAULT_AVATAR_THUMB,
-                               'micro' => DI::baseUrl() . self::DEFAULT_AVATAR_MICRO];
+                               'photo' => $avatar,
+                               'thumb' => self::getDefaultAvatar($contact, Proxy::SIZE_THUMB),
+                               'micro' => self::getDefaultAvatar($contact, Proxy::SIZE_MICRO)];
                        Logger::debug('Use default avatar', ['id' => $cid, 'uid' => $uid]);
                }
 
@@ -1614,7 +1829,7 @@ class Contact
                                        $contact['thumb'] ?? '',
                                        $contact['micro'] ?? '',
                                ];
-               
+
                                foreach ($data as $image_uri) {
                                        $image_rid = Photo::ridFromURI($image_uri);
                                        if ($image_rid && !Photo::exists(['resource-id' => $image_rid, 'uid' => $uid])) {
@@ -1666,59 +1881,84 @@ class Contact
                DBA::update('contact', $fields, ['id' => $cids]);
        }
 
+       public static function deleteContactByUrl(string $url)
+       {
+               // Update contact data for all users
+               $condition = ['self' => false, 'nurl' => Strings::normaliseLink($url)];
+               $contacts = DBA::select('contact', ['id', 'uid'], $condition);
+               while ($contact = DBA::fetch($contacts)) {
+                       Logger::info('Deleting contact', ['id' => $contact['id'], 'uid' => $contact['uid'], 'url' => $url]);
+                       self::remove($contact['id']);
+               }
+       }
+
        /**
         * Helper function for "updateFromProbe". Updates personal and public contact
         *
         * @param integer $id      contact id
         * @param integer $uid     user id
-        * @param string  $url     The profile URL of the contact
+        * @param string  $old_url The previous profile URL of the contact
+        * @param string  $new_url The profile URL of the contact
         * @param array   $fields  The fields that are updated
         *
         * @throws \Exception
         */
-       private static function updateContact($id, $uid, $url, array $fields)
+       private static function updateContact(int $id, int $uid, string $old_url, string $new_url, array $fields)
        {
+               if (Strings::normaliseLink($new_url) != Strings::normaliseLink($old_url)) {
+                       Logger::notice('New URL differs from old URL', ['old' => $old_url, 'new' => $new_url]);
+                       // @todo It is to decide what to do when the URL is changed
+               }
+
                if (!DBA::update('contact', $fields, ['id' => $id])) {
                        Logger::info('Couldn\'t update contact.', ['id' => $id, 'fields' => $fields]);
                        return;
                }
 
                // Search for duplicated contacts and get rid of them
-               if (self::removeDuplicates(Strings::normaliseLink($url), $uid) || ($uid != 0)) {
+               if (self::removeDuplicates(Strings::normaliseLink($new_url), $uid)) {
                        return;
                }
 
-               // Archive or unarchive the contact. We only need to do this for the public contact.
-               // The archive/unarchive function will update the personal contacts by themselves.
+               // Archive or unarchive the contact.
                $contact = DBA::selectFirst('contact', [], ['id' => $id]);
                if (!DBA::isResult($contact)) {
                        Logger::info('Couldn\'t select contact for archival.', ['id' => $id]);
                        return;
                }
 
-               if (!empty($fields['success_update'])) {
-                       self::unmarkForArchival($contact);
-               } elseif (!empty($fields['failure_update'])) {
-                       self::markForArchival($contact);
+               if (isset($fields['failed'])) {
+                       if ($fields['failed']) {
+                               self::markForArchival($contact);
+                       } else {
+                               self::unmarkForArchival($contact);
+                       }
                }
 
-               $condition = ['self' => false, 'nurl' => Strings::normaliseLink($url), 'network' => Protocol::FEDERATED];
+               if ($contact['uid'] != 0) {
+                       return;
+               }
 
-               // These contacts are sharing with us, we don't poll them.
-               // This means that we don't set the update fields in "OnePoll.php".
-               $condition['rel'] = self::SHARING;
+               // Update contact data for all users
+               $condition = ['self' => false, 'nurl' => Strings::normaliseLink($old_url)];
+
+               $condition['network'] = [Protocol::DFRN, Protocol::DIASPORA, Protocol::ACTIVITYPUB];
                DBA::update('contact', $fields, $condition);
 
-               unset($fields['last-update']);
-               unset($fields['success_update']);
-               unset($fields['failure_update']);
+               // We mustn't set the update fields for OStatus contacts since they are updated in OnePoll
+               $condition['network'] = Protocol::OSTATUS;
+
+               // If the contact failed, propagate the update fields to all contacts
+               if (empty($fields['failed'])) {
+                       unset($fields['last-update']);
+                       unset($fields['success_update']);
+                       unset($fields['failure_update']);
+               }
 
                if (empty($fields)) {
                        return;
                }
 
-               // We are polling these contacts, so we mustn't set the update fields here.
-               $condition['rel'] = [self::FOLLOWER, self::FRIEND];
                DBA::update('contact', $fields, $condition);
        }
 
@@ -1763,7 +2003,7 @@ class Contact
                        Worker::add(PRIORITY_HIGH, 'MergeContact', $first, $duplicate['id'], $uid);
                }
                DBA::close($duplicates);
-               Logger::info('Duplicates handled', ['uid' => $uid, 'nurl' => $nurl]);
+               Logger::info('Duplicates handled', ['uid' => $uid, 'nurl' => $nurl, 'callstack' => System::callstack(20)]);
                return true;
        }
 
@@ -1802,14 +2042,28 @@ class Contact
                // These fields aren't updated by this routine:
                // 'xmpp', 'sensitive'
 
-               $fields = ['uid', 'avatar', 'name', 'nick', 'location', 'keywords', 'about', 'subscribe', 'manually-approve',
-                       'unsearchable', 'url', 'addr', 'batch', 'notify', 'poll', 'request', 'confirm', 'poco',
+               $fields = ['uid', 'avatar', 'header', 'name', 'nick', 'location', 'keywords', 'about', 'subscribe',
+                       'manually-approve', 'unsearchable', 'url', 'addr', 'batch', 'notify', 'poll', 'request', 'confirm', 'poco',
                        'network', 'alias', 'baseurl', 'gsid', 'forum', 'prv', 'contact-type', 'pubkey', 'last-item'];
                $contact = DBA::selectFirst('contact', $fields, ['id' => $id]);
                if (!DBA::isResult($contact)) {
                        return false;
                }
 
+               if (self::isLocal($ret['url'])) {
+                       Logger::info('Local contacts are not updated here.');
+                       return true;
+               }
+
+               if (!empty($ret['account-type']) && $ret['account-type'] == User::ACCOUNT_TYPE_DELETED) {
+                       Logger::info('Deleted account', ['id' => $id, 'url' => $ret['url'], 'ret' => $ret]);
+                       self::remove($id);
+
+                       // Delete all contacts with the same URL
+                       self::deleteContactByUrl($ret['url']);
+                       return true;
+               }
+
                $uid = $contact['uid'];
                unset($contact['uid']);
 
@@ -1825,23 +2079,17 @@ class Contact
                // We check after the probing to be able to correct falsely detected contact types.
                if (($contact['contact-type'] == self::TYPE_RELAY) &&
                        (!Strings::compareLink($ret['url'], $contact['url']) || in_array($ret['network'], [Protocol::FEED, Protocol::PHANTOM]))) {
-                       self::updateContact($id, $uid, $contact['url'], ['failed' => false, 'last-update' => $updated, 'success_update' => $updated]);
+                       self::updateContact($id, $uid, $contact['url'], $contact['url'], ['failed' => false, 'last-update' => $updated, 'success_update' => $updated]);
                        Logger::info('Not updating relais', ['id' => $id, 'url' => $contact['url']]);
                        return true;
                }
 
                // If Probe::uri fails the network code will be different ("feed" or "unkn")
-               if (in_array($ret['network'], [Protocol::FEED, Protocol::PHANTOM]) && ($ret['network'] != $contact['network'])) {
-                       if ($uid == 0) {
-                               self::updateContact($id, $uid, $ret['url'], ['failed' => true, 'last-update' => $updated, 'failure_update' => $updated]);
-                       }
+               if (($ret['network'] == Protocol::PHANTOM) || (($ret['network'] == Protocol::FEED) && ($ret['network'] != $contact['network']))) {
+                       self::updateContact($id, $uid, $contact['url'], $ret['url'], ['failed' => true, 'last-update' => $updated, 'failure_update' => $updated]);
                        return false;
                }
 
-               if (Contact\Relation::isDiscoverable($ret['url'])) {
-                       Worker::add(PRIORITY_LOW, 'ContactDiscovery', $ret['url']);
-               }
-
                if (isset($ret['hide']) && is_bool($ret['hide'])) {
                        $ret['unsearchable'] = $ret['hide'];
                }
@@ -1888,7 +2136,11 @@ class Contact
                }
 
                if (!$update) {
-                       self::updateContact($id, $uid, $ret['url'], ['failed' => false, 'last-update' => $updated, 'success_update' => $updated]);
+                       self::updateContact($id, $uid, $contact['url'], $ret['url'], ['failed' => false, 'last-update' => $updated, 'success_update' => $updated]);
+
+                       if (Contact\Relation::isDiscoverable($ret['url'])) {
+                               Worker::add(PRIORITY_LOW, 'ContactDiscovery', $ret['url']);
+                       }
 
                        // Update the public contact
                        if ($uid != 0) {
@@ -1903,6 +2155,7 @@ class Contact
 
                $ret['nurl'] = Strings::normaliseLink($ret['url']);
                $ret['updated'] = $updated;
+               $ret['failed'] = false;
 
                // Only fill the pubkey if it had been empty before. We have to prevent identity theft.
                if (empty($pubkey) && !empty($new_pubkey)) {
@@ -1917,15 +2170,18 @@ class Contact
                        $ret['name-date'] = $updated;
                }
 
-               if ($uid == 0) {
+               if (($uid == 0) || in_array($ret['network'], [Protocol::DFRN, Protocol::DIASPORA, Protocol::ACTIVITYPUB])) {
                        $ret['last-update'] = $updated;
                        $ret['success_update'] = $updated;
-                       $ret['failed'] = false;
                }
 
                unset($ret['photo']);
 
-               self::updateContact($id, $uid, $ret['url'], $ret);
+               self::updateContact($id, $uid, $contact['url'], $ret['url'], $ret);
+
+               if (Contact\Relation::isDiscoverable($ret['url'])) {
+                       Worker::add(PRIORITY_LOW, 'ContactDiscovery', $ret['url']);
+               }
 
                return true;
        }
@@ -2181,8 +2437,11 @@ class Contact
                self::updateAvatar($contact_id, $ret['photo']);
 
                // pull feed and consume it, which should subscribe to the hub.
-
-               Worker::add(PRIORITY_HIGH, "OnePoll", $contact_id, "force");
+               if ($contact['network'] == Protocol::OSTATUS) {
+                       Worker::add(PRIORITY_HIGH, 'OnePoll', $contact_id, 'force');
+               } else {
+                       Worker::add(PRIORITY_HIGH, 'UpdateContact', $contact_id);
+               }
 
                $owner = User::getOwnerDataById($user['uid']);
 
@@ -2197,7 +2456,6 @@ class Contact
                                $item['title'] = '';
                                $item['guid'] = '';
                                $item['uri-id'] = 0;
-                               $item['attach'] = '';
 
                                $slap = OStatus::salmon($item, $owner);
 
@@ -2265,6 +2523,50 @@ class Contact
                return $contact;
        }
 
+       /**
+        * Follow a contact
+        *
+        * @param int $cid Public contact id
+        * @param int $uid  User ID
+        *
+        * @return bool "true" if following had been successful
+        */
+       public static function follow(int $cid, int $uid)
+       {
+               $user = User::getById($uid);
+               if (empty($user)) {
+                       return false;
+               }
+
+               $contact = self::getById($cid, ['url']);
+
+               $result = self::createFromProbe($user, $contact['url'], false);
+
+               return $result['cid'];
+       }
+
+       /**
+        * Unfollow a contact
+        *
+        * @param int $cid Public contact id
+        * @param int $uid  User ID
+        *
+        * @return bool "true" if unfollowing had been successful
+        */
+       public static function unfollow(int $cid, int $uid)
+       {
+               $cdata = self::getPublicAndUserContacID($cid, $uid);
+               if (empty($cdata['user'])) {
+                       return false;
+               }
+
+               $contact = self::getById($cdata['user']);
+
+               self::removeSharer([], $contact);
+
+               return true;
+       }
+
        /**
         * @param array  $importer Owner (local user) data
         * @param array  $contact  Existing owner-specific contact data we want to expand the relationship with. Optional.
@@ -2330,6 +2632,8 @@ class Contact
                        // Ensure to always have the correct network type, independent from the connection request method
                        self::updateFromProbe($contact['id']);
 
+                       Post\UserNotification::insertNotication($contact['id'], Verb::getID(Activity::FOLLOW), $importer['uid']);
+
                        return true;
                } else {
                        // send email notification to owner?
@@ -2361,6 +2665,8 @@ class Contact
 
                        self::updateAvatar($contact_id, $photo, true);
 
+                       Post\UserNotification::insertNotication($contact_id, Verb::getID(Activity::FOLLOW), $importer['uid']);
+
                        $contact_record = DBA::selectFirst('contact', ['id', 'network', 'name', 'url', 'photo'], ['id' => $contact_id]);
 
                        /// @TODO Encapsulate this into a function/method
@@ -2378,22 +2684,16 @@ class Contact
 
                                Group::addMember(User::getDefaultGroup($importer['uid'], $contact_record["network"]), $contact_record['id']);
 
-                               if (($user['notify-flags'] & Type::INTRO) &&
+                               if (($user['notify-flags'] & Notification\Type::INTRO) &&
                                        in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL])) {
 
                                        notification([
-                                               'type'         => Type::INTRO,
-                                               'notify_flags' => $user['notify-flags'],
-                                               'language'     => $user['language'],
-                                               'to_name'      => $user['username'],
-                                               'to_email'     => $user['email'],
-                                               'uid'          => $user['uid'],
-                                               'link'         => DI::baseUrl() . '/notifications/intros',
-                                               'source_name'  => ((strlen(stripslashes($contact_record['name']))) ? stripslashes($contact_record['name']) : DI::l10n()->t('[Name Withheld]')),
-                                               'source_link'  => $contact_record['url'],
-                                               'source_photo' => $contact_record['photo'],
-                                               'verb'         => ($sharing ? Activity::FRIEND : Activity::FOLLOW),
-                                               'otype'        => 'intro'
+                                               'type'  => Notification\Type::INTRO,
+                                               'otype' => Notification\ObjectType::INTRO,
+                                               'verb'  => ($sharing ? Activity::FRIEND : Activity::FOLLOW),
+                                               'uid'   => $user['uid'],
+                                               'cid'   => $contact_record['id'],
+                                               'link'  => DI::baseUrl() . '/notifications/intros',
                                        ]);
                                }
                        } elseif (DBA::isResult($user) && in_array($user['page-flags'], [User::PAGE_FLAGS_SOAPBOX, User::PAGE_FLAGS_FREELOVE, User::PAGE_FLAGS_COMMUNITY])) {
@@ -2404,7 +2704,7 @@ class Contact
                                $condition = ['uid' => $importer['uid'], 'url' => $url, 'pending' => true];
                                $fields = ['pending' => false];
                                if ($user['page-flags'] == User::PAGE_FLAGS_FREELOVE) {
-                                       $fields['rel'] = Contact::FRIEND;
+                                       $fields['rel'] = self::FRIEND;
                                }
 
                                DBA::update('contact', $fields, $condition);
@@ -2416,21 +2716,21 @@ class Contact
                return null;
        }
 
-       public static function removeFollower($importer, $contact, array $datarray = [], $item = "")
+       public static function removeFollower($importer, $contact)
        {
                if (($contact['rel'] == self::FRIEND) || ($contact['rel'] == self::SHARING)) {
                        DBA::update('contact', ['rel' => self::SHARING], ['id' => $contact['id']]);
                } else {
-                       Contact::remove($contact['id']);
+                       self::remove($contact['id']);
                }
        }
 
-       public static function removeSharer($importer, $contact, array $datarray = [], $item = "")
+       public static function removeSharer($importer, $contact)
        {
                if (($contact['rel'] == self::FRIEND) || ($contact['rel'] == self::FOLLOWER)) {
                        DBA::update('contact', ['rel' => self::FOLLOWER], ['id' => $contact['id']]);
                } else {
-                       Contact::remove($contact['id']);
+                       self::remove($contact['id']);
                }
        }
 
@@ -2442,17 +2742,16 @@ class Contact
        public static function updateBirthdays()
        {
                $condition = [
-                       '`bd` != ""
-                       AND `bd` > "0001-01-01"
-                       AND SUBSTRING(`bd`, 1, 4) != `bdyear`
+                       '`bd` > ?
                        AND (`contact`.`rel` = ? OR `contact`.`rel` = ?)
                        AND NOT `contact`.`pending`
                        AND NOT `contact`.`hidden`
                        AND NOT `contact`.`blocked`
                        AND NOT `contact`.`archive`
                        AND NOT `contact`.`deleted`',
-                       Contact::SHARING,
-                       Contact::FRIEND
+                       DBA::NULL_DATE,
+                       self::SHARING,
+                       self::FRIEND
                ];
 
                $contacts = DBA::select('contact', ['id', 'uid', 'name', 'url', 'bd'], $condition);
@@ -2487,7 +2786,7 @@ class Contact
                        return [];
                }
 
-               $contacts = Contact::selectToArray(['id'], [
+               $contacts = self::selectToArray(['id'], [
                        'id'      => $contact_ids,
                        'blocked' => false,
                        'pending' => false,
@@ -2536,7 +2835,7 @@ class Contact
         * @throws HTTPException\InternalServerErrorException
         * @throws \ImagickException
         */
-       public static function magicLinkbyId($cid, $url = '')
+       public static function magicLinkById($cid, $url = '')
        {
                $contact = DBA::selectFirst('contact', ['id', 'network', 'url', 'uid'], ['id' => $cid]);
 
@@ -2557,7 +2856,7 @@ class Contact
        {
                $destination = $url ?: $contact['url']; // Equivalent to ($url != '') ? $url : $contact['url'];
 
-               if (!Session::isAuthenticated() || ($contact['network'] != Protocol::DFRN)) {
+               if (!Session::isAuthenticated()) {
                        return $destination;
                }
 
@@ -2566,8 +2865,12 @@ class Contact
                        return $url;
                }
 
-               if (!empty($contact['uid'])) {
-                       return self::magicLink($contact['url'], $url);
+               if (DI::pConfig()->get(local_user(), 'system', 'stay_local') && ($url == '')) {
+                       return 'contact/' . $contact['id'] . '/conversations';
+               }
+
+               if (!empty($contact['network']) && $contact['network'] != Protocol::DFRN) {
+                       return $destination;
                }
 
                if (empty($contact['id'])) {
@@ -2622,11 +2925,12 @@ class Contact
         *
         * @param string $search Name or nick
         * @param string $mode   Search mode (e.g. "community")
+        * @param int    $uid    User ID
         *
         * @return array with search results
         * @throws \Friendica\Network\HTTPException\InternalServerErrorException
         */
-       public static function searchByName($search, $mode = '')
+       public static function searchByName(string $search, string $mode = '', int $uid = 0)
        {
                if (empty($search)) {
                        return [];
@@ -2647,7 +2951,7 @@ class Contact
 
                // check if we search only communities or every contact
                if ($mode === 'community') {
-                       $extra_sql = sprintf(' AND `contact-type` = %d', Contact::TYPE_COMMUNITY);
+                       $extra_sql = sprintf(' AND `contact-type` = %d', self::TYPE_COMMUNITY);
                } else {
                        $extra_sql = '';
                }
@@ -2659,7 +2963,7 @@ class Contact
                                NOT `failed` AND `uid` = ? AND
                                (`addr` LIKE ? OR `name` LIKE ? OR `nick` LIKE ?) $extra_sql
                                ORDER BY `nurl` DESC LIMIT 1000",
-                       Protocol::DFRN, Protocol::ACTIVITYPUB, $ostatus, $diaspora, 0, $search, $search, $search
+                       Protocol::DFRN, Protocol::ACTIVITYPUB, $ostatus, $diaspora, $uid, $search, $search, $search
                );
 
                $contacts = DBA::toArray($results);
@@ -2676,40 +2980,46 @@ class Contact
        {
                $added = 0;
                $updated = 0;
+               $unchanged = 0;
                $count = 0;
 
                foreach ($urls as $url) {
-                       $contact = Contact::getByURL($url, false, ['id']); 
+                       if (empty($url) || !is_string($url)) {
+                               continue;
+                       }
+                       $contact = self::getByURL($url, false, ['id', 'updated']);
                        if (empty($contact['id'])) {
                                Worker::add(PRIORITY_LOW, 'AddContact', 0, $url);
                                ++$added;
-                       } else {
+                       } elseif ($contact['updated'] < DateTimeFormat::utc('now -7 days')) {
                                Worker::add(PRIORITY_LOW, 'UpdateContact', $contact['id']);
                                ++$updated;
+                       } else {
+                               ++$unchanged;
                        }
                        ++$count;
                }
 
-               return ['count' => $count, 'added' => $added, 'updated' => $updated];
+               return ['count' => $count, 'added' => $added, 'updated' => $updated, 'unchanged' => $unchanged];
        }
 
        /**
-        * Returns a random, global contact of the current node
+        * Returns a random, global contact array of the current node
         *
-        * @return string The profile URL
+        * @return array The profile array
         * @throws Exception
         */
-       public static function getRandomUrl()
+       public static function getRandomContact()
        {
-               $r = DBA::selectFirst('contact', ['url'], [
+               $contact = DBA::selectFirst('contact', ['id', 'network', 'url', 'uid'], [
                        "`uid` = ? AND `network` = ? AND NOT `failed` AND `last-item` > ?",
                        0, Protocol::DFRN, DateTimeFormat::utc('now - 1 month'),
                ], ['order' => ['RAND()']]);
 
-               if (DBA::isResult($r)) {
-                       return $r['url'];
+               if (DBA::isResult($contact)) {
+                       return $contact;
                }
 
-               return '';
+               return [];
        }
 }