]> git.mxchange.org Git - friendica.git/blobdiff - src/Protocol/OStatus.php
Rename App->path to App->urlpath
[friendica.git] / src / Protocol / OStatus.php
index 7ff8f8f60c6692c93f91549cf7ed8a450a061912..36f3faf2de5de6bcf5e9d9822f99dcbbd60c6f4e 100644 (file)
@@ -4,28 +4,32 @@
  */
 namespace Friendica\Protocol;
 
-use Friendica\App;
+use dba;
+use DOMDocument;
+use DOMXPath;
+use Friendica\Content\Text\BBCode;
+use Friendica\Content\Text\HTML;
 use Friendica\Core\Cache;
 use Friendica\Core\Config;
+use Friendica\Core\L10n;
+use Friendica\Core\Lock;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
-use Friendica\Model\GlobalContact;
+use Friendica\Model\Contact;
+use Friendica\Model\Conversation;
+use Friendica\Model\GContact;
+use Friendica\Model\Item;
+use Friendica\Model\User;
 use Friendica\Network\Probe;
-use Friendica\Object\Contact;
-use Friendica\Util\Lock;
+use Friendica\Object\Image;
+use Friendica\Util\DateTimeFormat;
+use Friendica\Util\Network;
 use Friendica\Util\XML;
-use dba;
-use DOMDocument;
-use DomXPath;
 
-require_once 'include/threads.php';
-require_once 'include/html2bbcode.php';
-require_once 'include/bbcode.php';
+require_once 'include/dba.php';
 require_once 'include/items.php';
 require_once 'mod/share.php';
 require_once 'include/enotify.php';
-require_once 'include/Photo.php';
-require_once 'include/follow.php';
 require_once 'include/api.php';
 require_once 'mod/proxy.php';
 
@@ -35,7 +39,7 @@ require_once 'mod/proxy.php';
 class OStatus
 {
        private static $itemlist;
-       private static $conv_list = array();
+       private static $conv_list = [];
 
        /**
         * @brief Fetches author data
@@ -50,75 +54,59 @@ class OStatus
         */
        private static function fetchAuthor($xpath, $context, $importer, &$contact, $onlyfetch)
        {
-               $author = array();
-               $author["author-link"] = $xpath->evaluate('atom:author/atom:uri/text()', $context)->item(0)->nodeValue;
-               $author["author-name"] = $xpath->evaluate('atom:author/atom:name/text()', $context)->item(0)->nodeValue;
-               $addr = $xpath->evaluate('atom:author/atom:email/text()', $context)->item(0)->nodeValue;
+               $author = [];
+               $author["author-link"] = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()', $context);
+               $author["author-name"] = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $context);
+               $addr = XML::getFirstNodeValue($xpath, 'atom:author/atom:email/text()', $context);
 
                $aliaslink = $author["author-link"];
 
-               $alternate = $xpath->query("atom:author/atom:link[@rel='alternate']", $context)->item(0)->attributes;
-               if (is_object($alternate)) {
-                       foreach ($alternate as $attributes) {
+               $alternate_item = $xpath->query("atom:author/atom:link[@rel='alternate']", $context)->item(0);
+               if (is_object($alternate_item)) {
+                       foreach ($alternate_item->attributes as $attributes) {
                                if (($attributes->name == "href") && ($attributes->textContent != "")) {
                                        $author["author-link"] = $attributes->textContent;
                                }
                        }
                }
-               $author["contact-id"] = $contact["id"];
+               $author["author-id"] = Contact::getIdForURL($author["author-link"]);
 
-               $found = false;
+               $author["contact-id"] = $contact["id"];
 
+               $contact = null;
                if ($aliaslink != '') {
-                       $condition = array("`uid` = ? AND `alias` = ? AND `network` != ?",
-                                       $importer["uid"], $aliaslink, NETWORK_STATUSNET);
-                       $r = dba::select('contact', array(), $condition, array('limit' => 1));
-
-                       if (DBM::is_result($r)) {
-                               $found = true;
-                               if ($r['blocked']) {
-                                       $r['id'] = -1;
-                               }
-                               $contact = $r;
-                               $author["contact-id"] = $r["id"];
-                       }
+                       $condition = ["`uid` = ? AND `alias` = ? AND `network` != ? AND `rel` IN (?, ?)",
+                                       $importer["uid"], $aliaslink, NETWORK_STATUSNET,
+                                       CONTACT_IS_SHARING, CONTACT_IS_FRIEND];
+                       $contact = dba::selectFirst('contact', [], $condition);
                }
 
-               if (!$found && ($author["author-link"] != "")) {
+               if (!DBM::is_result($contact) && $author["author-link"] != '') {
                        if ($aliaslink == "") {
                                $aliaslink = $author["author-link"];
                        }
 
-                       $condition = array("`uid` = ? AND `nurl` IN (?, ?) AND `network` != ?", $importer["uid"],
-                                       normalise_link($author["author-link"]), normalise_link($aliaslink), NETWORK_STATUSNET);
-                       $r = dba::select('contact', array(), $condition, array('limit' => 1));
-
-                       if (DBM::is_result($r)) {
-                               $found = true;
-                               if ($r['blocked']) {
-                                       $r['id'] = -1;
-                               }
-                               $contact = $r;
-                               $author["contact-id"] = $r["id"];
-                       }
+                       $condition = ["`uid` = ? AND `nurl` IN (?, ?) AND `network` != ? AND `rel` IN (?, ?)",
+                                       $importer["uid"], normalise_link($author["author-link"]), normalise_link($aliaslink),
+                                       NETWORK_STATUSNET, CONTACT_IS_SHARING, CONTACT_IS_FRIEND];
+                       $contact = dba::selectFirst('contact', [], $condition);
                }
 
-               if (!$found && ($addr != "")) {
-                       $condition = array("`uid` = ? AND `addr` = ? AND `network` != ?",
-                                       $importer["uid"], $addr, NETWORK_STATUSNET);
-                       $r = dba::select('contact', array(), $condition, array('limit' => 1));
+               if (!DBM::is_result($contact) && ($addr != '')) {
+                       $condition = ["`uid` = ? AND `addr` = ? AND `network` != ? AND `rel` IN (?, ?)",
+                                       $importer["uid"], $addr, NETWORK_STATUSNET,
+                                       CONTACT_IS_SHARING, CONTACT_IS_FRIEND];
+                       $contact = dba::selectFirst('contact', [], $condition);
+               }
 
-                       if (DBM::is_result($r)) {
-                               $found = true;
-                               if ($r['blocked']) {
-                                       $r['id'] = -1;
-                               }
-                               $contact = $r;
-                               $author["contact-id"] = $r["id"];
+               if (DBM::is_result($contact)) {
+                       if ($contact['blocked']) {
+                               $contact['id'] = -1;
                        }
+                       $author["contact-id"] = $contact["id"];
                }
 
-               $avatarlist = array();
+               $avatarlist = [];
                $avatars = $xpath->query("atom:author/atom:link[@rel='avatar']", $context);
                foreach ($avatars as $avatar) {
                        $href = "";
@@ -140,22 +128,17 @@ class OStatus
                        $author["author-avatar"] = Probe::fixAvatar(current($avatarlist), $author["author-link"]);
                }
 
-               $displayname = $xpath->evaluate('atom:author/poco:displayName/text()', $context)->item(0)->nodeValue;
+               $displayname = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()', $context);
                if ($displayname != "") {
                        $author["author-name"] = $displayname;
                }
 
-               $author["owner-name"] = $author["author-name"];
-               $author["owner-link"] = $author["author-link"];
-               $author["owner-avatar"] = $author["author-avatar"];
+               $author["owner-id"] = $author["author-id"];
 
                // Only update the contacts if it is an OStatus contact
-               if ($r && ($r['id'] > 0) && !$onlyfetch && ($contact["network"] == NETWORK_OSTATUS)) {
-                       // This contact is vital, so we awake it from the dead
-                       Contact::unmarkForArchival($contact);
+               if (DBM::is_result($contact) && ($contact['id'] > 0) && !$onlyfetch && ($contact["network"] == NETWORK_OSTATUS)) {
 
                        // Update contact data
-
                        $current = $contact;
                        unset($current['name-date']);
 
@@ -172,66 +155,70 @@ class OStatus
                        $contact['url'] = $author["author-link"];
                        $contact['nurl'] = normalise_link($contact['url']);
 
-                       $value = $xpath->evaluate('atom:author/atom:uri/text()', $context)->item(0)->nodeValue;
+                       $value = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()', $context);
                        if ($value != "") {
                                $contact["alias"] = $value;
                        }
 
-                       $value = $xpath->evaluate('atom:author/poco:displayName/text()', $context)->item(0)->nodeValue;
+                       $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()', $context);
                        if ($value != "") {
                                $contact["name"] = $value;
                        }
 
-                       $value = $xpath->evaluate('atom:author/poco:preferredUsername/text()', $context)->item(0)->nodeValue;
+                       $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()', $context);
                        if ($value != "") {
                                $contact["nick"] = $value;
                        }
 
-                       $value = $xpath->evaluate('atom:author/poco:note/text()', $context)->item(0)->nodeValue;
+                       $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:note/text()', $context);
                        if ($value != "") {
-                               $contact["about"] = html2bbcode($value);
+                               $contact["about"] = HTML::toBBCode($value);
                        }
 
-                       $value = $xpath->evaluate('atom:author/poco:address/poco:formatted/text()', $context)->item(0)->nodeValue;
+                       $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:address/poco:formatted/text()', $context);
                        if ($value != "") {
                                $contact["location"] = $value;
                        }
 
-                       $contact['name-date'] = datetime_convert();
+                       $contact['name-date'] = DateTimeFormat::utcNow();
 
-                       dba::update('contact', $contact, array('id' => $contact["id"]), $current);
+                       dba::update('contact', $contact, ['id' => $contact["id"]], $current);
 
                        if (!empty($author["author-avatar"]) && ($author["author-avatar"] != $current['avatar'])) {
                                logger("Update profile picture for contact ".$contact["id"], LOGGER_DEBUG);
-                               update_contact_avatar($author["author-avatar"], $importer["uid"], $contact["id"]);
+                               Contact::updateAvatar($author["author-avatar"], $importer["uid"], $contact["id"]);
                        }
 
                        // Ensure that we are having this contact (with uid=0)
-                       $cid = Contact::getIdForURL($aliaslink, 0);
+                       $cid = Contact::getIdForURL($aliaslink, 0, true);
 
                        if ($cid) {
-                               $fields = array('url', 'nurl', 'name', 'nick', 'alias', 'about', 'location');
-                               $old_contact = dba::select('contact', $fields, array('id' => $cid), array('limit' => 1));
+                               $fields = ['url', 'nurl', 'name', 'nick', 'alias', 'about', 'location'];
+                               $old_contact = dba::selectFirst('contact', $fields, ['id' => $cid]);
 
                                // Update it with the current values
-                               $fields = array('url' => $author["author-link"], 'name' => $contact["name"],
+                               $fields = ['url' => $author["author-link"], 'name' => $contact["name"],
                                                'nurl' => normalise_link($author["author-link"]),
                                                'nick' => $contact["nick"], 'alias' => $contact["alias"],
                                                'about' => $contact["about"], 'location' => $contact["location"],
-                                               'success_update' => datetime_convert(), 'last-update' => datetime_convert());
+                                               'success_update' => DateTimeFormat::utcNow(), 'last-update' => DateTimeFormat::utcNow()];
 
-                               dba::update('contact', $fields, array('id' => $cid), $old_contact);
+                               dba::update('contact', $fields, ['id' => $cid], $old_contact);
 
                                // Update the avatar
-                               update_contact_avatar($author["author-avatar"], 0, $cid);
+                               if (!empty($author["author-avatar"])) {
+                                       Contact::updateAvatar($author["author-avatar"], 0, $cid);
+                               }
                        }
 
                        $contact["generation"] = 2;
                        $contact["hide"] = false; // OStatus contacts are never hidden
-                       $contact["photo"] = $author["author-avatar"];
-                       $gcid = GlobalContact::update($contact);
+                       if (!empty($author["author-avatar"])) {
+                               $contact["photo"] = $author["author-avatar"];
+                       }
+                       $gcid = GContact::update($contact);
 
-                       GlobalContact::link($gcid, $contact["uid"], $contact["id"]);
+                       GContact::link($gcid, $contact["uid"], $contact["id"]);
                }
 
                return $author;
@@ -254,7 +241,7 @@ class OStatus
                $doc = new DOMDocument();
                @$doc->loadXML($xml);
 
-               $xpath = new DomXPath($doc);
+               $xpath = new DOMXPath($doc);
                $xpath->registerNamespace('atom', NAMESPACE_ATOM1);
                $xpath->registerNamespace('thr', NAMESPACE_THREAD);
                $xpath->registerNamespace('georss', NAMESPACE_GEORSS);
@@ -264,13 +251,12 @@ class OStatus
                $xpath->registerNamespace('ostatus', NAMESPACE_OSTATUS);
                $xpath->registerNamespace('statusnet', NAMESPACE_STATUSNET);
 
-               $entries = $xpath->query('/atom:entry');
+               $contact = ["id" => 0];
 
-               foreach ($entries as $entry) {
-                       // fetch the author
-                       $author = self::fetchAuthor($xpath, $entry, $importer, $contact, true);
-                       return $author;
-               }
+               // Fetch the first author
+               $authordata = $xpath->query('//author')->item(0);
+               $author = self::fetchAuthor($xpath, $authordata, $importer, $contact, true);
+               return $author;
        }
 
        /**
@@ -282,7 +268,7 @@ class OStatus
         */
        private static function readAttributes($element)
        {
-               $attribute = array();
+               $attribute = [];
 
                foreach ($element->attributes as $attributes) {
                        $attribute[$attributes->name] = $attributes->textContent;
@@ -298,6 +284,7 @@ class OStatus
         * @param array  $importer user record of the importing user
         * @param array  $contact  contact
         * @param string $hub      Called by reference, returns the fetched hub data
+        * @return void
         */
        public static function import($xml, $importer, &$contact, &$hub)
        {
@@ -309,7 +296,7 @@ class OStatus
         *
         * @param string  $xml        The XML
         * @param array   $importer   user record of the importing user
-        * @param array   $contact
+        * @param array   $contact    contact
         * @param string  $hub        Called by reference, returns the fetched hub data
         * @param boolean $stored     Is the post fresh imported or from the database?
         * @param boolean $initialize Is it the leading post so that data has to be initialized?
@@ -319,8 +306,8 @@ class OStatus
        private static function process($xml, $importer, &$contact, &$hub, $stored = false, $initialize = true)
        {
                if ($initialize) {
-                       self::$itemlist = array();
-                       self::$conv_list = array();
+                       self::$itemlist = [];
+                       self::$conv_list = [];
                }
 
                logger("Import OStatus message", LOGGER_DEBUG);
@@ -331,7 +318,7 @@ class OStatus
                $doc = new DOMDocument();
                @$doc->loadXML($xml);
 
-               $xpath = new DomXPath($doc);
+               $xpath = new DOMXPath($doc);
                $xpath->registerNamespace('atom', NAMESPACE_ATOM1);
                $xpath->registerNamespace('thr', NAMESPACE_THREAD);
                $xpath->registerNamespace('georss', NAMESPACE_GEORSS);
@@ -342,23 +329,26 @@ class OStatus
                $xpath->registerNamespace('statusnet', NAMESPACE_STATUSNET);
 
                $hub = "";
-               $hub_attributes = $xpath->query("/atom:feed/atom:link[@rel='hub']")->item(0)->attributes;
-               if (is_object($hub_attributes)) {
-                       foreach ($hub_attributes as $hub_attribute) {
-                               if ($hub_attribute->name == "href") {
-                                       $hub = $hub_attribute->textContent;
-                                       logger("Found hub ".$hub, LOGGER_DEBUG);
+               $hub_items = $xpath->query("/atom:feed/atom:link[@rel='hub']")->item(0);
+               if (is_object($hub_items)) {
+                       $hub_attributes = $hub_items->attributes;
+                       if (is_object($hub_attributes)) {
+                               foreach ($hub_attributes as $hub_attribute) {
+                                       if ($hub_attribute->name == "href") {
+                                               $hub = $hub_attribute->textContent;
+                                               logger("Found hub ".$hub, LOGGER_DEBUG);
+                                       }
                                }
                        }
                }
 
-               $header = array();
+               $header = [];
                $header["uid"] = $importer["uid"];
                $header["network"] = NETWORK_OSTATUS;
-               $header["type"] = "remote";
+               $header["type"] = "remote-comment";
                $header["wall"] = 0;
                $header["origin"] = 0;
-               $header["gravity"] = GRAVITY_PARENT;
+               $header["gravity"] = GRAVITY_COMMENT;
 
                $first_child = $doc->firstChild->tagName;
 
@@ -389,7 +379,7 @@ class OStatus
                $entry = $xpath->query('/atom:entry');
 
                // Reverse the order of the entries
-               $entrylist = array();
+               $entrylist = [];
 
                foreach ($entries as $entry) {
                        $entrylist[] = $entry;
@@ -407,7 +397,7 @@ class OStatus
                                $author = self::fetchAuthor($xpath, $entry, $importer, $contact, $stored);
                        }
 
-                       $value = $xpath->evaluate('atom:author/poco:preferredUsername/text()', $entry)->item(0)->nodeValue;
+                       $value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()', $entry);
                        if ($value != "") {
                                $nickname = $value;
                        } else {
@@ -416,24 +406,24 @@ class OStatus
 
                        $item = array_merge($header, $author);
 
-                       $item["uri"] = $xpath->query('atom:id/text()', $entry)->item(0)->nodeValue;
+                       $item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 
-                       $item["verb"] = $xpath->query('activity:verb/text()', $entry)->item(0)->nodeValue;
+                       $item["verb"] = XML::getFirstNodeValue($xpath, 'activity:verb/text()', $entry);
 
                        // Delete a message
-                       if (in_array($item["verb"], array('qvitter-delete-notice', ACTIVITY_DELETE, 'delete'))) {
+                       if (in_array($item["verb"], ['qvitter-delete-notice', ACTIVITY_DELETE, 'delete'])) {
                                self::deleteNotice($item);
                                continue;
                        }
 
-                       if (in_array($item["verb"], array(NAMESPACE_OSTATUS."/unfavorite", ACTIVITY_UNFAVORITE))) {
+                       if (in_array($item["verb"], [NAMESPACE_OSTATUS."/unfavorite", ACTIVITY_UNFAVORITE])) {
                                // Ignore "Unfavorite" message
                                logger("Ignore unfavorite message ".print_r($item, true), LOGGER_DEBUG);
                                continue;
                        }
 
                        // Deletions come with the same uri, so we check for duplicates after processing deletions
-                       if (dba::exists('item', array('uid' => $importer["uid"], 'uri' => $item["uri"]))) {
+                       if (Item::exists(['uid' => $importer["uid"], 'uri' => $item["uri"]])) {
                                logger('Post with URI '.$item["uri"].' already existed for user '.$importer["uid"].'.', LOGGER_DEBUG);
                                continue;
                        } else {
@@ -453,12 +443,13 @@ class OStatus
                        }
 
                        if ($item["verb"] == ACTIVITY_FOLLOW) {
-                               new_follower($importer, $contact, $item, $nickname);
+                               Contact::addRelationship($importer, $contact, $item, $nickname);
                                continue;
                        }
 
                        if ($item["verb"] == NAMESPACE_OSTATUS."/unfollow") {
-                               lose_follower($importer, $contact, $item, $dummy);
+                               $dummy = null;
+                               Contact::removeFollower($importer, $contact, $item, $dummy);
                                continue;
                        }
 
@@ -466,13 +457,15 @@ class OStatus
                                $orig_uri = $xpath->query("activity:object/atom:id", $entry)->item(0)->nodeValue;
                                logger("Favorite ".$orig_uri." ".print_r($item, true));
 
+                               $item["type"] = "activity";
                                $item["verb"] = ACTIVITY_LIKE;
                                $item["parent-uri"] = $orig_uri;
-                               $item["gravity"] = GRAVITY_LIKE;
+                               $item["gravity"] = GRAVITY_ACTIVITY;
+                               $item["object-type"] = ACTIVITY_OBJ_NOTE;
                        }
 
                        // http://activitystrea.ms/schema/1.0/rsvp-yes
-                       if (!in_array($item["verb"], array(ACTIVITY_POST, ACTIVITY_LIKE, ACTIVITY_SHARE))) {
+                       if (!in_array($item["verb"], [ACTIVITY_POST, ACTIVITY_LIKE, ACTIVITY_SHARE])) {
                                logger("Unhandled verb ".$item["verb"]." ".print_r($item, true), LOGGER_DEBUG);
                        }
 
@@ -485,20 +478,31 @@ class OStatus
                                        if (!$valid) {
                                                // If not, then it depends on this setting
                                                $valid = !Config::get('system', 'ostatus_full_threads');
+                                               if ($valid) {
+                                                       logger("Item with uri ".self::$itemlist[0]['uri']." will be imported due to the system settings.", LOGGER_DEBUG);
+                                               }
+                                       } else {
+                                               logger("Item with uri ".self::$itemlist[0]['uri']." belongs to a contact (".self::$itemlist[0]['contact-id']."). It will be imported.", LOGGER_DEBUG);
                                        }
                                        if ($valid) {
                                                // Never post a thread when the only interaction by our contact was a like
                                                $valid = false;
-                                               $verbs = array(ACTIVITY_POST, ACTIVITY_SHARE);
+                                               $verbs = [ACTIVITY_POST, ACTIVITY_SHARE];
                                                foreach (self::$itemlist as $item) {
                                                        if (!empty($item['contact-id']) && in_array($item['verb'], $verbs)) {
                                                                $valid = true;
                                                        }
                                                }
+                                               if ($valid) {
+                                                       logger("Item with uri ".self::$itemlist[0]['uri']." will be imported since the thread contains posts or shares.", LOGGER_DEBUG);
+                                               }
                                        }
                                } else {
                                        // But we will only import complete threads
-                                       $valid = dba::exists('item', array('uid' => $importer["uid"], 'uri' => self::$itemlist[0]['parent-uri']));
+                                       $valid = Item::exists(['uid' => $importer["uid"], 'uri' => self::$itemlist[0]['parent-uri']]);
+                                       if ($valid) {
+                                               logger("Item with uri ".self::$itemlist[0]["uri"]." belongs to parent ".self::$itemlist[0]['parent-uri']." of user ".$importer["uid"].". It will be imported.", LOGGER_DEBUG);
+                                       }
                                }
 
                                if ($valid) {
@@ -512,50 +516,44 @@ class OStatus
                                                }
                                        }
                                        foreach (self::$itemlist as $item) {
-                                               $found = dba::exists('item', array('uid' => $importer["uid"], 'uri' => $item["uri"]));
+                                               $found = Item::exists(['uid' => $importer["uid"], 'uri' => $item["uri"]]);
                                                if ($found) {
                                                        logger("Item with uri ".$item["uri"]." for user ".$importer["uid"]." already exists.", LOGGER_DEBUG);
                                                } elseif ($item['contact-id'] < 0) {
                                                        logger("Item with uri ".$item["uri"]." is from a blocked contact.", LOGGER_DEBUG);
                                                } else {
                                                        // We are having duplicated entries. Hopefully this solves it.
-                                                       if (Lock::set('ostatus_process_item_store')) {
-                                                               $ret = item_store($item);
-                                                               Lock::remove('ostatus_process_item_store');
+                                                       if (Lock::acquire('ostatus_process_item_insert')) {
+                                                               $ret = Item::insert($item);
+                                                               Lock::release('ostatus_process_item_insert');
                                                                logger("Item with uri ".$item["uri"]." for user ".$importer["uid"].' stored. Return value: '.$ret);
                                                        } else {
-                                                               $ret = item_store($item);
+                                                               $ret = Item::insert($item);
                                                                logger("We couldn't lock - but tried to store the item anyway. Return value is ".$ret);
                                                        }
                                                }
                                        }
                                }
-                               self::$itemlist = array();
+                               self::$itemlist = [];
                        }
                        logger('Processing done for post with URI '.$item["uri"].' for user '.$importer["uid"].'.', LOGGER_DEBUG);
                }
                return true;
        }
 
+       /**
+        * @param object $item item
+        * @return void
+        */
        private static function deleteNotice($item)
        {
-               $condition = array('uid' => $item['uid'], 'author-link' => $item['author-link'], 'uri' => $item['uri']);
-               $deleted = dba::select('item', array('id', 'parent-uri'), $condition, array('limit' => 1));
-               if (!DBM::is_result($deleted)) {
-                       logger('Item from '.$item['author-link'].' with uri '.$item['uri'].' for user '.$item['uid']." wasn't found. We don't delete it. ");
+               $condition = ['uid' => $item['uid'], 'author-id' => $item['author-id'], 'uri' => $item['uri']];
+               if (!Item::exists($condition)) {
+                       logger('Item from '.$item['author-link'].' with uri '.$item['uri'].' for user '.$item['uid']." wasn't found. We don't delete it.");
                        return;
                }
 
-               // Currently we don't have a central deletion function that we could use in this case
-               // The function "item_drop" doesn't work for that case
-               dba::update(
-                       'item',
-                       array('deleted' => true, 'title' => '', 'body' => '',
-                                       'edited' => datetime_convert(), 'changed' => datetime_convert()),
-                       array('id' => $deleted["id"])
-               );
-
-               delete_thread($deleted["id"], $deleted["parent-uri"]);
+               Item::delete($condition);
 
                logger('Deleted item with uri '.$item['uri'].' for user '.$item['uid']);
        }
@@ -567,22 +565,22 @@ class OStatus
         * @param object $entry    The xml entry that is processed
         * @param array  $item     The item array
         * @param array  $importer user record of the importing user
+        * @return void
         */
        private static function processPost($xpath, $entry, &$item, $importer)
        {
-               $item["body"] = html2bbcode($xpath->query('atom:content/text()', $entry)->item(0)->nodeValue);
-               $item["object-type"] = $xpath->query('activity:object-type/text()', $entry)->item(0)->nodeValue;
+               $item["body"] = HTML::toBBCode(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
+               $item["object-type"] = XML::getFirstNodeValue($xpath, 'activity:object-type/text()', $entry);
                if (($item["object-type"] == ACTIVITY_OBJ_BOOKMARK) || ($item["object-type"] == ACTIVITY_OBJ_EVENT)) {
-                       $item["title"] = $xpath->query('atom:title/text()', $entry)->item(0)->nodeValue;
-                       $item["body"] = $xpath->query('atom:summary/text()', $entry)->item(0)->nodeValue;
+                       $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
+                       $item["body"] = XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry);
                } elseif ($item["object-type"] == ACTIVITY_OBJ_QUESTION) {
-                       $item["title"] = $xpath->query('atom:title/text()', $entry)->item(0)->nodeValue;
+                       $item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
                }
 
-               $item["created"] = $xpath->query('atom:published/text()', $entry)->item(0)->nodeValue;
-               $item["edited"] = $xpath->query('atom:updated/text()', $entry)->item(0)->nodeValue;
-               $conversation = $xpath->query('ostatus:conversation/text()', $entry)->item(0)->nodeValue;
-               $item['conversation-uri'] = $conversation;
+               $item["created"] = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
+               $item["edited"] = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
+               $item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
 
                $conv = $xpath->query('ostatus:conversation', $entry);
                if (is_object($conv->item(0))) {
@@ -621,9 +619,12 @@ class OStatus
                                foreach ($category->attributes as $attributes) {
                                        if ($attributes->name == "term") {
                                                $term = $attributes->textContent;
-                                               if (strlen($item["tag"])) {
+                                               if (!empty($item["tag"])) {
                                                        $item["tag"] .= ',';
+                                               } else {
+                                                       $item["tag"] = '';
                                                }
+
                                                $item["tag"] .= "#[url=".System::baseUrl()."/search?tag=".$term."]".$term."[/url]";
                                        }
                                }
@@ -670,9 +671,10 @@ class OStatus
 
                // Mastodon Content Warning
                if (($item["verb"] == ACTIVITY_POST) && $xpath->evaluate('boolean(atom:summary)', $entry)) {
-                       $clear_text = $xpath->query('atom:summary/text()', $entry)->item(0)->nodeValue;
-
-                       $item["body"] = html2bbcode($clear_text) . '[spoiler]' . $item["body"] . '[/spoiler]';
+                       $clear_text = XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry);
+                       if (!empty($clear_text)) {
+                               $item['content-warning'] = HTML::toBBCode($clear_text);
+                       }
                }
 
                if (($self != '') && empty($item['protocol'])) {
@@ -683,21 +685,22 @@ class OStatus
                        self::fetchConversation($item['conversation-href'], $item['conversation-uri']);
                }
 
-               if (isset($item["parent-uri"]) && ($related != '')) {
-                       if (!dba::exists('item', array('uid' => $importer["uid"], 'uri' => $item['parent-uri']))) {
-                               self::fetchRelated($related, $item["parent-uri"], $importer);
+               if (isset($item["parent-uri"])) {
+                       if (!Item::exists(['uid' => $importer["uid"], 'uri' => $item['parent-uri']])) {
+                               if ($related != '') {
+                                       self::fetchRelated($related, $item["parent-uri"], $importer);
+                               }
                        } else {
                                logger('Reply with URI '.$item["uri"].' already existed for user '.$importer["uid"].'.', LOGGER_DEBUG);
                        }
-
-                       $item["type"] = 'remote-comment';
-                       $item["gravity"] = GRAVITY_COMMENT;
                } else {
                        $item["parent-uri"] = $item["uri"];
+                       $item["gravity"] = GRAVITY_PARENT;
+                       $item["type"] = "remote";
                }
 
                if (($item['author-link'] != '') && !empty($item['protocol'])) {
-                       $item = store_conversation($item);
+                       $item = Conversation::insert($item);
                }
 
                self::$itemlist[] = $item;
@@ -708,6 +711,7 @@ class OStatus
         *
         * @param string $conversation     The link to the conversation
         * @param string $conversation_uri The conversation in "uri" format
+        * @return void
         */
        private static function fetchConversation($conversation, $conversation_uri)
        {
@@ -718,7 +722,7 @@ class OStatus
 
                self::$conv_list[$conversation] = true;
 
-               $conversation_data = z_fetch_url($conversation, false, $redirects, array('accept_content' => 'application/atom+xml, text/html'));
+               $conversation_data = Network::curl($conversation, false, $redirects, ['accept_content' => 'application/atom+xml, text/html']);
 
                if (!$conversation_data['success']) {
                        return;
@@ -735,10 +739,11 @@ class OStatus
                        if (!@$doc->loadHTML($conversation_data['body'])) {
                                return;
                        }
-                       $xpath = new DomXPath($doc);
+                       $xpath = new DOMXPath($doc);
 
                        $links = $xpath->query('//link');
                        if ($links) {
+                               $file = '';
                                foreach ($links as $link) {
                                        $attribute = self::readAttributes($link);
                                        if (($attribute['rel'] == 'alternate') && ($attribute['type'] == 'application/atom+xml')) {
@@ -746,7 +751,7 @@ class OStatus
                                        }
                                }
                                if ($file != '') {
-                                       $conversation_atom = z_fetch_url($attribute['href']);
+                                       $conversation_atom = Network::curl($attribute['href']);
 
                                        if ($conversation_atom['success']) {
                                                $xml = $conversation_atom['body'];
@@ -768,13 +773,14 @@ class OStatus
         * @param string $xml              The feed
         * @param string $conversation     conversation
         * @param string $conversation_uri conversation uri
+        * @return void
         */
        private static function storeConversation($xml, $conversation = '', $conversation_uri = '')
        {
                $doc = new DOMDocument();
                @$doc->loadXML($xml);
 
-               $xpath = new DomXPath($doc);
+               $xpath = new DOMXPath($doc);
                $xpath->registerNamespace('atom', NAMESPACE_ATOM1);
                $xpath->registerNamespace('thr', NAMESPACE_THREAD);
                $xpath->registerNamespace('ostatus', NAMESPACE_OSTATUS);
@@ -787,11 +793,11 @@ class OStatus
                        $doc2->preserveWhiteSpace = false;
                        $doc2->formatOutput = true;
 
-                       $conv_data = array();
+                       $conv_data = [];
 
                        $conv_data['protocol'] = PROTOCOL_SPLITTED_CONV;
                        $conv_data['network'] = NETWORK_OSTATUS;
-                       $conv_data['uri'] = $xpath->query('atom:id/text()', $entry)->item(0)->nodeValue;
+                       $conv_data['uri'] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 
                        $inreplyto = $xpath->query('thr:in-reply-to', $entry);
                        if (is_object($inreplyto->item(0))) {
@@ -802,8 +808,7 @@ class OStatus
                                }
                        }
 
-                       $conv = $xpath->query('ostatus:conversation/text()', $entry)->item(0)->nodeValue;
-                       $conv_data['conversation-uri'] = $conv;
+                       $conv_data['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
 
                        $conv = $xpath->query('ostatus:conversation', $entry);
                        if (is_object($conv->item(0))) {
@@ -831,36 +836,37 @@ class OStatus
 
                        $conv_data['source'] = $doc2->saveXML();
 
-                       $condition = array('item-uri' => $conv_data['uri'],'protocol' => PROTOCOL_OSTATUS_FEED);
+                       $condition = ['item-uri' => $conv_data['uri'],'protocol' => PROTOCOL_OSTATUS_FEED];
                        if (dba::exists('conversation', $condition)) {
                                logger('Delete deprecated entry for URI '.$conv_data['uri'], LOGGER_DEBUG);
-                               dba::delete('conversation', array('item-uri' => $conv_data['uri']));
+                               dba::delete('conversation', ['item-uri' => $conv_data['uri']]);
                        }
 
                        logger('Store conversation data for uri '.$conv_data['uri'], LOGGER_DEBUG);
-                       store_conversation($conv_data);
+                       Conversation::insert($conv_data);
                }
        }
 
        /**
         * @brief Fetch the own post so that it can be stored later
-        * @param array  $item The item array
         *
         * We want to store the original data for later processing.
         * This function is meant for cases where we process a feed with multiple entries.
         * In that case we need to fetch the single posts here.
         *
         * @param string $self The link to the self item
+        * @param array  $item The item array
+        * @return void
         */
        private static function fetchSelf($self, &$item)
        {
-               $condition = array('`item-uri` = ? AND `protocol` IN (?, ?)', $self, PROTOCOL_DFRN, PROTOCOL_OSTATUS_SALMON);
+               $condition = ['`item-uri` = ? AND `protocol` IN (?, ?)', $self, PROTOCOL_DFRN, PROTOCOL_OSTATUS_SALMON];
                if (dba::exists('conversation', $condition)) {
                        logger('Conversation '.$item['uri'].' is already stored.', LOGGER_DEBUG);
                        return;
                }
 
-               $self_data = z_fetch_url($self);
+               $self_data = Network::curl($self);
 
                if (!$self_data['success']) {
                        return;
@@ -885,11 +891,12 @@ class OStatus
         * @param string $related     The link to the related item
         * @param string $related_uri The related item in "uri" format
         * @param array  $importer    user record of the importing user
+        * @return void
         */
        private static function fetchRelated($related, $related_uri, $importer)
        {
-               $condition = array('`item-uri` = ? AND `protocol` IN (?, ?)', $related_uri, PROTOCOL_DFRN, PROTOCOL_OSTATUS_SALMON);
-               $conversation = dba::select('conversation', array('source', 'protocol'), $condition,  array('limit' => 1));
+               $condition = ['`item-uri` = ? AND `protocol` IN (?, ?)', $related_uri, PROTOCOL_DFRN, PROTOCOL_OSTATUS_SALMON];
+               $conversation = dba::selectFirst('conversation', ['source', 'protocol'], $condition);
                if (DBM::is_result($conversation)) {
                        $stored = true;
                        $xml = $conversation['source'];
@@ -899,12 +906,12 @@ class OStatus
                        }
                        if ($conversation['protocol'] == PROTOCOL_OSTATUS_SALMON) {
                                logger('Delete invalid cached XML for URI '.$related_uri, LOGGER_DEBUG);
-                               dba::delete('conversation', array('item-uri' => $related_uri));
+                               dba::delete('conversation', ['item-uri' => $related_uri]);
                        }
                }
 
                $stored = false;
-               $related_data = z_fetch_url($related, false, $redirects, array('accept_content' => 'application/atom+xml, text/html'));
+               $related_data = Network::curl($related, false, $redirects, ['accept_content' => 'application/atom+xml, text/html']);
 
                if (!$related_data['success']) {
                        return;
@@ -922,7 +929,7 @@ class OStatus
                        if (!@$doc->loadHTML($related_data['body'])) {
                                return;
                        }
-                       $xpath = new DomXPath($doc);
+                       $xpath = new DOMXPath($doc);
 
                        $atom_file = '';
 
@@ -935,7 +942,7 @@ class OStatus
                                        }
                                }
                                if ($atom_file != '') {
-                                       $related_atom = z_fetch_url($atom_file);
+                                       $related_atom = Network::curl($atom_file);
 
                                        if ($related_atom['success']) {
                                                logger('Fetched XML for URI '.$related_uri, LOGGER_DEBUG);
@@ -947,7 +954,7 @@ class OStatus
 
                // Workaround for older GNU Social servers
                if (($xml == '') && strstr($related, '/notice/')) {
-                       $related_atom = z_fetch_url(str_replace('/notice/', '/api/statuses/show/', $related).'.atom');
+                       $related_atom = Network::curl(str_replace('/notice/', '/api/statuses/show/', $related).'.atom');
 
                        if ($related_atom['success']) {
                                logger('GNU Social workaround to fetch XML for URI '.$related_uri, LOGGER_DEBUG);
@@ -958,7 +965,7 @@ class OStatus
                // Even more worse workaround for GNU Social ;-)
                if ($xml == '') {
                        $related_guess = OStatus::convertHref($related_uri);
-                       $related_atom = z_fetch_url(str_replace('/notice/', '/api/statuses/show/', $related_guess).'.atom');
+                       $related_atom = Network::curl(str_replace('/notice/', '/api/statuses/show/', $related_guess).'.atom');
 
                        if ($related_atom['success']) {
                                logger('GNU Social workaround 2 to fetch XML for URI '.$related_uri, LOGGER_DEBUG);
@@ -968,8 +975,8 @@ class OStatus
 
                // Finally we take the data that we fetched from "ostatus:conversation"
                if ($xml == '') {
-                       $condition = array('item-uri' => $related_uri, 'protocol' => PROTOCOL_SPLITTED_CONV);
-                       $conversation = dba::select('conversation', array('source'), $condition,  array('limit' => 1));
+                       $condition = ['item-uri' => $related_uri, 'protocol' => PROTOCOL_SPLITTED_CONV];
+                       $conversation = dba::selectFirst('conversation', ['source'], $condition);
                        if (DBM::is_result($conversation)) {
                                $stored = true;
                                logger('Got cached XML from conversation for URI '.$related_uri, LOGGER_DEBUG);
@@ -1000,38 +1007,37 @@ class OStatus
                $activityobjects = $xpath->query('activity:object', $entry)->item(0);
 
                if (!is_object($activityobjects)) {
-                       return array();
+                       return [];
                }
 
-               $link_data = array();
+               $link_data = [];
 
-               $orig_uri = $xpath->query('atom:id/text()', $activityobjects)->item(0)->nodeValue;
+               $orig_uri = XML::getFirstNodeValue($xpath, 'atom:id/text()', $activityobjects);
 
                $links = $xpath->query("atom:link", $activityobjects);
                if ($links) {
                        $link_data = self::processLinks($links, $item);
                }
 
-               $orig_body = $xpath->query('atom:content/text()', $activityobjects)->item(0)->nodeValue;
-               $orig_created = $xpath->query('atom:published/text()', $activityobjects)->item(0)->nodeValue;
-               $orig_edited = $xpath->query('atom:updated/text()', $activityobjects)->item(0)->nodeValue;
+               $orig_body = XML::getFirstNodeValue($xpath, 'atom:content/text()', $activityobjects);
+               $orig_created = XML::getFirstNodeValue($xpath, 'atom:published/text()', $activityobjects);
+               $orig_edited = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $activityobjects);
 
-               $orig_contact = $contact;
-               $orig_author = self::fetchAuthor($xpath, $activityobjects, $importer, $orig_contact, false);
+               $orig_author = self::fetchAuthor($xpath, $activityobjects, $importer, $dummy, false);
 
                $item["author-name"] = $orig_author["author-name"];
                $item["author-link"] = $orig_author["author-link"];
-               $item["author-avatar"] = $orig_author["author-avatar"];
+               $item["author-id"] = $orig_author["author-id"];
 
-               $item["body"] = html2bbcode($orig_body);
+               $item["body"] = HTML::toBBCode($orig_body);
                $item["created"] = $orig_created;
                $item["edited"] = $orig_edited;
 
                $item["uri"] = $orig_uri;
 
-               $item["verb"] = $xpath->query('activity:verb/text()', $activityobjects)->item(0)->nodeValue;
+               $item["verb"] = XML::getFirstNodeValue($xpath, 'activity:verb/text()', $activityobjects);
 
-               $item["object-type"] = $xpath->query('activity:object-type/text()', $activityobjects)->item(0)->nodeValue;
+               $item["object-type"] = XML::getFirstNodeValue($xpath, 'activity:object-type/text()', $activityobjects);
 
                $inreplyto = $xpath->query('thr:in-reply-to', $activityobjects);
                if (is_object($inreplyto->item(0))) {
@@ -1055,12 +1061,12 @@ class OStatus
         */
        private static function processLinks($links, &$item)
        {
-               $link_data = array('add_body' => '', 'self' => '');
+               $link_data = ['add_body' => '', 'self' => ''];
 
                foreach ($links as $link) {
                        $attribute = self::readAttributes($link);
 
-                       if (($attribute['rel'] != "") && ($attribute['href'] != "")) {
+                       if (!empty($attribute['rel']) && !empty($attribute['href'])) {
                                switch ($attribute['rel']) {
                                        case "alternate":
                                                $item["plink"] = $attribute['href'];
@@ -1082,13 +1088,15 @@ class OStatus
                                                if ($filetype == 'image') {
                                                        $link_data['add_body'] .= "\n[img]".$attribute['href'].'[/img]';
                                                } else {
-                                                       if (strlen($item["attach"])) {
+                                                       if (!empty($item["attach"])) {
                                                                $item["attach"] .= ',';
+                                                       } else {
+                                                               $item["attach"] = '';
                                                        }
                                                        if (!isset($attribute['length'])) {
                                                                $attribute['length'] = "0";
                                                        }
-                                                       $item["attach"] .= '[attach]href="'.$attribute['href'].'" length="'.$attribute['length'].'" type="'.$attribute['type'].'" title="'.$attribute['title'].'"[/attach]';
+                                                       $item["attach"] .= '[attach]href="'.$attribute['href'].'" length="'.$attribute['length'].'" type="'.$attribute['type'].'" title="'.defaults($attribute, 'title', '').'"[/attach]';
                                                }
                                                break;
                                        case "related":
@@ -1102,7 +1110,7 @@ class OStatus
                                                }
                                                break;
                                        case "self":
-                                               if ($item["plink"] == '') {
+                                               if (empty($item["plink"])) {
                                                        $item["plink"] = $attribute['href'];
                                                }
                                                $link_data['self'] = $attribute['href'];
@@ -1176,12 +1184,12 @@ class OStatus
 
                $guid = "";
                preg_match("/guid='(.*?)'/ism", $attributes, $matches);
-               if ($matches[1] != "") {
+               if (!empty($matches[1])) {
                        $guid = $matches[1];
                }
 
                preg_match('/guid="(.*?)"/ism', $attributes, $matches);
-               if ($matches[1] != "") {
+               if (!empty($matches[1])) {
                        $guid = $matches[1];
                }
 
@@ -1197,7 +1205,7 @@ class OStatus
         */
        private static function formatPicturePost($body)
        {
-               $siteinfo = get_attached_data($body);
+               $siteinfo = BBCode::getAttachedData($body);
 
                if (($siteinfo["type"] == "photo")) {
                        if (isset($siteinfo["preview"])) {
@@ -1210,8 +1218,8 @@ class OStatus
                        $preview = proxy_url($preview, false, PROXY_SIZE_SMALL);
 
                        // Is it a local picture? Then make it smaller here
-                       $preview = str_replace(array("-0.jpg", "-0.png"), array("-2.jpg", "-2.png"), $preview);
-                       $preview = str_replace(array("-1.jpg", "-1.png"), array("-2.jpg", "-2.png"), $preview);
+                       $preview = str_replace(["-0.jpg", "-0.png"], ["-2.jpg", "-2.png"], $preview);
+                       $preview = str_replace(["-1.jpg", "-1.png"], ["-2.jpg", "-2.png"], $preview);
 
                        if (isset($siteinfo["url"])) {
                                $url = $siteinfo["url"];
@@ -1228,12 +1236,13 @@ class OStatus
        /**
         * @brief Adds the header elements to the XML document
         *
-        * @param object $doc   XML document
-        * @param array  $owner Contact data of the poster
+        * @param object $doc    XML document
+        * @param array  $owner  Contact data of the poster
+        * @param string $filter The related feed filter (activity, posts or comments)
         *
         * @return object header root element
         */
-       private static function addHeader($doc, $owner)
+       private static function addHeader($doc, $owner, $filter)
        {
                $a = get_app();
 
@@ -1249,18 +1258,25 @@ class OStatus
                $root->setAttribute("xmlns:statusnet", NAMESPACE_STATUSNET);
                $root->setAttribute("xmlns:mastodon", NAMESPACE_MASTODON);
 
-               $attributes = array("uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION."-".DB_UPDATE_VERSION);
+               $title = '';
+               switch ($filter) {
+                       case 'activity': $title = L10n::t('%s\'s timeline', $owner['name']); break;
+                       case 'posts'   : $title = L10n::t('%s\'s posts'   , $owner['name']); break;
+                       case 'comments': $title = L10n::t('%s\'s comments', $owner['name']); break;
+               }
+
+               $attributes = ["uri" => "https://friendi.ca", "version" => FRIENDICA_VERSION . "-" . DB_UPDATE_VERSION];
                XML::addElement($doc, $root, "generator", FRIENDICA_PLATFORM, $attributes);
-               XML::addElement($doc, $root, "id", System::baseUrl()."/profile/".$owner["nick"]);
-               XML::addElement($doc, $root, "title", sprintf("%s timeline", $owner["name"]));
+               XML::addElement($doc, $root, "id", System::baseUrl() . "/profile/" . $owner["nick"]);
+               XML::addElement($doc, $root, "title", $title);
                XML::addElement($doc, $root, "subtitle", sprintf("Updates from %s on %s", $owner["name"], $a->config["sitename"]));
                XML::addElement($doc, $root, "logo", $owner["photo"]);
-               XML::addElement($doc, $root, "updated", datetime_convert("UTC", "UTC", "now", ATOM_TIME));
+               XML::addElement($doc, $root, "updated", DateTimeFormat::utcNow(DateTimeFormat::ATOM));
 
                $author = self::addAuthor($doc, $owner);
                $root->appendChild($author);
 
-               $attributes = array("href" => $owner["url"], "rel" => "alternate", "type" => "text/html");
+               $attributes = ["href" => $owner["url"], "rel" => "alternate", "type" => "text/html"];
                XML::addElement($doc, $root, "link", "", $attributes);
 
                /// @TODO We have to find out what this is
@@ -1271,19 +1287,26 @@ class OStatus
 
                self::hublinks($doc, $root, $owner["nick"]);
 
-               $attributes = array("href" => System::baseUrl()."/salmon/".$owner["nick"], "rel" => "salmon");
+               $attributes = ["href" => System::baseUrl() . "/salmon/" . $owner["nick"], "rel" => "salmon"];
                XML::addElement($doc, $root, "link", "", $attributes);
 
-               $attributes = array("href" => System::baseUrl()."/salmon/".$owner["nick"], "rel" => "http://salmon-protocol.org/ns/salmon-replies");
+               $attributes = ["href" => System::baseUrl() . "/salmon/" . $owner["nick"], "rel" => "http://salmon-protocol.org/ns/salmon-replies"];
                XML::addElement($doc, $root, "link", "", $attributes);
 
-               $attributes = array("href" => System::baseUrl()."/salmon/".$owner["nick"], "rel" => "http://salmon-protocol.org/ns/salmon-mention");
+               $attributes = ["href" => System::baseUrl() . "/salmon/" . $owner["nick"], "rel" => "http://salmon-protocol.org/ns/salmon-mention"];
                XML::addElement($doc, $root, "link", "", $attributes);
 
-               $attributes = array("href" => System::baseUrl()."/api/statuses/user_timeline/".$owner["nick"].".atom",
-                               "rel" => "self", "type" => "application/atom+xml");
+               $attributes = ["href" => System::baseUrl() . "/api/statuses/user_timeline/" . $owner["nick"] . ".atom",
+                       "rel" => "self", "type" => "application/atom+xml"];
                XML::addElement($doc, $root, "link", "", $attributes);
 
+               if ($owner['account-type'] == ACCOUNT_TYPE_COMMUNITY) {
+                       $condition = ['uid' => $owner['uid'], 'self' => false, 'pending' => false,
+                                       'archive' => false, 'hidden' => false, 'blocked' => false];
+                       $members = dba::count('contact', $condition);
+                       XML::addElement($doc, $root, "statusnet:group_info", "", ["member_count" => $members]);
+               }
+
                return $root;
        }
 
@@ -1293,40 +1316,44 @@ class OStatus
         * @param object $doc  XML document
         * @param object $root XML root element where the hub links are added
         * @param object $nick nick
+        * @return void
         */
        public static function hublinks($doc, $root, $nick)
        {
                $h = System::baseUrl() . '/pubsubhubbub/'.$nick;
-               XML::addElement($doc, $root, "link", "", array("href" => $h, "rel" => "hub"));
+               XML::addElement($doc, $root, "link", "", ["href" => $h, "rel" => "hub"]);
        }
 
        /**
-        * @brief Adds attachement data to the XML document
+        * @brief Adds attachment data to the XML document
         *
         * @param object $doc  XML document
         * @param object $root XML root element where the hub links are added
         * @param array  $item Data of the item that is to be posted
+        * @return void
         */
        private static function getAttachment($doc, $root, $item)
        {
                $o = "";
-               $siteinfo = get_attached_data($item["body"]);
+               $siteinfo = BBCode::getAttachedData($item["body"]);
 
                switch ($siteinfo["type"]) {
                        case 'photo':
-                               $imgdata = get_photo_info($siteinfo["image"]);
-                               $attributes = array("rel" => "enclosure",
-                                               "href" => $siteinfo["image"],
-                                               "type" => $imgdata["mime"],
-                                               "length" => intval($imgdata["size"]));
-                               XML::addElement($doc, $root, "link", "", $attributes);
+                               $imgdata = Image::getInfoFromURL($siteinfo["image"]);
+                               if ($imgdata) {
+                                       $attributes = ["rel" => "enclosure",
+                                                       "href" => $siteinfo["image"],
+                                                       "type" => $imgdata["mime"],
+                                                       "length" => intval($imgdata["size"])];
+                                       XML::addElement($doc, $root, "link", "", $attributes);
+                               }
                                break;
                        case 'video':
-                               $attributes = array("rel" => "enclosure",
+                               $attributes = ["rel" => "enclosure",
                                                "href" => $siteinfo["url"],
                                                "type" => "text/html; charset=UTF-8",
                                                "length" => "",
-                                               "title" => $siteinfo["title"]);
+                                               "title" => $siteinfo["title"]];
                                XML::addElement($doc, $root, "link", "", $attributes);
                                break;
                        default:
@@ -1334,13 +1361,15 @@ class OStatus
                }
 
                if (!Config::get('system', 'ostatus_not_attach_preview') && ($siteinfo["type"] != "photo") && isset($siteinfo["image"])) {
-                       $imgdata = get_photo_info($siteinfo["image"]);
-                       $attributes = array("rel" => "enclosure",
-                                       "href" => $siteinfo["image"],
-                                       "type" => $imgdata["mime"],
-                                       "length" => intval($imgdata["size"]));
+                       $imgdata = Image::getInfoFromURL($siteinfo["image"]);
+                       if ($imgdata) {
+                               $attributes = ["rel" => "enclosure",
+                                               "href" => $siteinfo["image"],
+                                               "type" => $imgdata["mime"],
+                                               "length" => intval($imgdata["size"])];
 
-                       XML::addElement($doc, $root, "link", "", $attributes);
+                               XML::addElement($doc, $root, "link", "", $attributes);
+                       }
                }
 
                $arr = explode('[/attach],', $item['attach']);
@@ -1349,9 +1378,9 @@ class OStatus
                                $matches = false;
                                $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
                                if ($cnt) {
-                                       $attributes = array("rel" => "enclosure",
+                                       $attributes = ["rel" => "enclosure",
                                                        "href" => $matches[1],
-                                                       "type" => $matches[3]);
+                                                       "type" => $matches[3]];
 
                                        if (intval($matches[2])) {
                                                $attributes["length"] = intval($matches[2]);
@@ -1373,67 +1402,73 @@ class OStatus
         *
         * @return object author element
         */
-       private static function addAuthor($doc, $owner)
+       private static function addAuthor($doc, $owner, $show_profile = true)
        {
-               $r = q("SELECT `homepage`, `publish` FROM `profile` WHERE `uid` = %d AND `is-default` LIMIT 1", intval($owner["uid"]));
-               if (DBM::is_result($r)) {
-                       $profile = $r[0];
-               }
+               $profile = dba::selectFirst('profile', ['homepage', 'publish'], ['uid' => $owner['uid'], 'is-default' => true]);
                $author = $doc->createElement("author");
                XML::addElement($doc, $author, "id", $owner["url"]);
-               XML::addElement($doc, $author, "activity:object-type", ACTIVITY_OBJ_PERSON);
+               if ($owner['account-type'] == ACCOUNT_TYPE_COMMUNITY) {
+                       XML::addElement($doc, $author, "activity:object-type", ACTIVITY_OBJ_GROUP);
+               } else {
+                       XML::addElement($doc, $author, "activity:object-type", ACTIVITY_OBJ_PERSON);
+               }
                XML::addElement($doc, $author, "uri", $owner["url"]);
                XML::addElement($doc, $author, "name", $owner["nick"]);
                XML::addElement($doc, $author, "email", $owner["addr"]);
-               XML::addElement($doc, $author, "summary", bbcode($owner["about"], false, false, 7));
+               if ($show_profile) {
+                       XML::addElement($doc, $author, "summary", BBCode::convert($owner["about"], false, 7));
+               }
 
-               $attributes = array("rel" => "alternate", "type" => "text/html", "href" => $owner["url"]);
+               $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $owner["url"]];
                XML::addElement($doc, $author, "link", "", $attributes);
 
-               $attributes = array(
+               $attributes = [
                                "rel" => "avatar",
                                "type" => "image/jpeg", // To-Do?
                                "media:width" => 175,
                                "media:height" => 175,
-                               "href" => $owner["photo"]);
+                               "href" => $owner["photo"]];
                XML::addElement($doc, $author, "link", "", $attributes);
 
                if (isset($owner["thumb"])) {
-                       $attributes = array(
+                       $attributes = [
                                        "rel" => "avatar",
                                        "type" => "image/jpeg", // To-Do?
                                        "media:width" => 80,
                                        "media:height" => 80,
-                                       "href" => $owner["thumb"]);
+                                       "href" => $owner["thumb"]];
                        XML::addElement($doc, $author, "link", "", $attributes);
                }
 
                XML::addElement($doc, $author, "poco:preferredUsername", $owner["nick"]);
                XML::addElement($doc, $author, "poco:displayName", $owner["name"]);
-               XML::addElement($doc, $author, "poco:note", bbcode($owner["about"], false, false, 7));
+               if ($show_profile) {
+                       XML::addElement($doc, $author, "poco:note", BBCode::convert($owner["about"], false, 7));
 
-               if (trim($owner["location"]) != "") {
-                       $element = $doc->createElement("poco:address");
-                       XML::addElement($doc, $element, "poco:formatted", $owner["location"]);
-                       $author->appendChild($element);
+                       if (trim($owner["location"]) != "") {
+                               $element = $doc->createElement("poco:address");
+                               XML::addElement($doc, $element, "poco:formatted", $owner["location"]);
+                               $author->appendChild($element);
+                       }
                }
 
-               if (trim($profile["homepage"]) != "") {
-                       $urls = $doc->createElement("poco:urls");
-                       XML::addElement($doc, $urls, "poco:type", "homepage");
-                       XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
-                       XML::addElement($doc, $urls, "poco:primary", "true");
-                       $author->appendChild($urls);
-               }
+               if (DBM::is_result($profile) && !$show_profile) {
+                       if (trim($profile["homepage"]) != "") {
+                               $urls = $doc->createElement("poco:urls");
+                               XML::addElement($doc, $urls, "poco:type", "homepage");
+                               XML::addElement($doc, $urls, "poco:value", $profile["homepage"]);
+                               XML::addElement($doc, $urls, "poco:primary", "true");
+                               $author->appendChild($urls);
+                       }
 
-               if (count($profile)) {
-                       XML::addElement($doc, $author, "followers", "", array("url" => System::baseUrl()."/viewcontacts/".$owner["nick"]));
-                       XML::addElement($doc, $author, "statusnet:profile_info", "", array("local_id" => $owner["uid"]));
-               }
+                       XML::addElement($doc, $author, "followers", "", ["url" => System::baseUrl()."/viewcontacts/".$owner["nick"]]);
+                       XML::addElement($doc, $author, "statusnet:profile_info", "", ["local_id" => $owner["uid"]]);
 
-               if ($profile["publish"]) {
-                       XML::addElement($doc, $author, "mastodon:scope", "public");
+                       if ($profile["publish"]) {
+                               XML::addElement($doc, $author, "mastodon:scope", "public");
+                       }
                }
+
                return $author;
        }
 
@@ -1468,7 +1503,7 @@ class OStatus
         */
        private static function constructObjecttype($item)
        {
-               if (in_array($item['object-type'], array(ACTIVITY_OBJ_NOTE, ACTIVITY_OBJ_COMMENT)))
+               if (in_array($item['object-type'], [ACTIVITY_OBJ_NOTE, ACTIVITY_OBJ_COMMENT]))
                        return $item['object-type'];
                return ACTIVITY_OBJ_NOTE;
        }
@@ -1485,6 +1520,8 @@ class OStatus
         */
        private static function entry($doc, $item, $owner, $toplevel = false)
        {
+               $xml = null;
+
                $repeated_guid = self::getResharedGuid($item);
                if ($repeated_guid != "") {
                        $xml = self::reshareEntry($doc, $item, $owner, $repeated_guid, $toplevel);
@@ -1496,7 +1533,7 @@ class OStatus
 
                if ($item["verb"] == ACTIVITY_LIKE) {
                        return self::likeEntry($doc, $item, $owner, $toplevel);
-               } elseif (in_array($item["verb"], array(ACTIVITY_FOLLOW, NAMESPACE_OSTATUS."/unfollow"))) {
+               } elseif (in_array($item["verb"], [ACTIVITY_FOLLOW, NAMESPACE_OSTATUS."/unfollow"])) {
                        return self::followEntry($doc, $item, $owner, $toplevel);
                } else {
                        return self::noteEntry($doc, $item, $owner, $toplevel);
@@ -1516,10 +1553,10 @@ class OStatus
                $source = $doc->createElement("source");
                XML::addElement($doc, $source, "id", $contact["poll"]);
                XML::addElement($doc, $source, "title", $contact["name"]);
-               XML::addElement($doc, $source, "link", "", array("rel" => "alternate", "type" => "text/html", "href" => $contact["alias"]));
-               XML::addElement($doc, $source, "link", "", array("rel" => "self", "type" => "application/atom+xml", "href" => $contact["poll"]));
+               XML::addElement($doc, $source, "link", "", ["rel" => "alternate", "type" => "text/html", "href" => $contact["alias"]]);
+               XML::addElement($doc, $source, "link", "", ["rel" => "self", "type" => "application/atom+xml", "href" => $contact["poll"]]);
                XML::addElement($doc, $source, "icon", $contact["photo"]);
-               XML::addElement($doc, $source, "updated", datetime_convert("UTC", "UTC", $contact["success_update"]."+00:00", ATOM_TIME));
+               XML::addElement($doc, $source, "updated", DateTimeFormat::utc($contact["success_update"]."+00:00", DateTimeFormat::ATOM));
 
                return $source;
        }
@@ -1582,7 +1619,7 @@ class OStatus
         * @param object $doc           XML document
         * @param array  $item          Data of the item that is to be posted
         * @param array  $owner         Contact data of the poster
-        * @param        $repeated_guid
+        * @param string $repeated_guid guid
         * @param bool   $toplevel      Is it for en entry element (false) or a feed entry (true)?
         *
         * @return object Entry element
@@ -1593,24 +1630,17 @@ class OStatus
                        logger("OStatus entry is from author ".$owner["url"]." - not from ".$item["author-link"].". Quitting.", LOGGER_DEBUG);
                }
 
-               $title = self::entryHeader($doc, $entry, $owner, $toplevel);
+               $title = self::entryHeader($doc, $entry, $owner, $item, $toplevel);
 
-               $r = q(
-                       "SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' AND NOT `private` AND `network` IN ('%s', '%s', '%s') LIMIT 1",
-                       intval($owner["uid"]),
-                       dbesc($repeated_guid),
-                       dbesc(NETWORK_DFRN),
-                       dbesc(NETWORK_DIASPORA),
-                       dbesc(NETWORK_OSTATUS)
-               );
-               if (DBM::is_result($r)) {
-                       $repeated_item = $r[0];
-               } else {
+               $condition = ['uid' => $owner["uid"], 'guid' => $repeated_guid, 'private' => false,
+                       'network' => [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS]];
+               $repeated_item = Item::selectFirst([], $condition);
+               if (!DBM::is_result($repeated_item)) {
                        return false;
                }
-               $contact = self::contactEntry($repeated_item['author-link'], $owner);
 
-               $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
+               $contact = self::contactEntry($repeated_item['author-link'], $owner);
+               $contact['account-type'] = $contact['contact-type'];
 
                $title = $owner["nick"]." repeated a notice by ".$contact["nick"];
 
@@ -1622,7 +1652,7 @@ class OStatus
 
                self::entryContent($doc, $as_object, $repeated_item, $owner, "", "", false);
 
-               $author = self::addAuthor($doc, $contact);
+               $author = self::addAuthor($doc, $contact, false);
                $as_object->appendChild($author);
 
                $as_object2 = $doc->createElement("activity:object");
@@ -1664,23 +1694,18 @@ class OStatus
                        logger("OStatus entry is from author ".$owner["url"]." - not from ".$item["author-link"].". Quitting.", LOGGER_DEBUG);
                }
 
-               $title = self::entryHeader($doc, $entry, $owner, $toplevel);
+               $title = self::entryHeader($doc, $entry, $owner, $item, $toplevel);
 
                $verb = NAMESPACE_ACTIVITY_SCHEMA."favorite";
                self::entryContent($doc, $entry, $item, $owner, "Favorite", $verb, false);
 
                $as_object = $doc->createElement("activity:object");
 
-               $parent = q(
-                       "SELECT * FROM `item` WHERE `uri` = '%s' AND `uid` = %d",
-                       dbesc($item["thr-parent"]),
-                       intval($item["uid"])
-               );
-               $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
+               $parent = Item::selectFirst([], ['uri' => $item["thr-parent"], 'uid' => $item["uid"]]);
 
-               XML::addElement($doc, $as_object, "activity:object-type", self::constructObjecttype($parent[0]));
+               XML::addElement($doc, $as_object, "activity:object-type", self::constructObjecttype($parent));
 
-               self::entryContent($doc, $as_object, $parent[0], $owner, "New entry");
+               self::entryContent($doc, $as_object, $parent, $owner, "New entry");
 
                $entry->appendChild($as_object);
 
@@ -1711,15 +1736,15 @@ class OStatus
                XML::addElement($doc, $object, "id", $contact["alias"]);
                XML::addElement($doc, $object, "title", $contact["nick"]);
 
-               $attributes = array("rel" => "alternate", "type" => "text/html", "href" => $contact["url"]);
+               $attributes = ["rel" => "alternate", "type" => "text/html", "href" => $contact["url"]];
                XML::addElement($doc, $object, "link", "", $attributes);
 
-               $attributes = array(
+               $attributes = [
                                "rel" => "avatar",
                                "type" => "image/jpeg", // To-Do?
                                "media:width" => 175,
                                "media:height" => 175,
-                               "href" => $contact["photo"]);
+                               "href" => $contact["photo"]];
                XML::addElement($doc, $object, "link", "", $attributes);
 
                XML::addElement($doc, $object, "poco:preferredUsername", $contact["nick"]);
@@ -1771,12 +1796,12 @@ class OStatus
                }
 
                if ($item['verb'] == ACTIVITY_FOLLOW) {
-                       $message = t('%s is now following %s.');
-                       $title = t('following');
+                       $message = L10n::t('%s is now following %s.');
+                       $title = L10n::t('following');
                        $action = "subscription";
                } else {
-                       $message = t('%s stopped following %s.');
-                       $title = t('stopped following');
+                       $message = L10n::t('%s stopped following %s.');
+                       $title = L10n::t('stopped following');
                        $action = "unfollow";
                }
 
@@ -1787,7 +1812,7 @@ class OStatus
 
                $item["body"] = sprintf($message, $owner["nick"], $contact["nick"]);
 
-               self::entryHeader($doc, $entry, $owner, $toplevel);
+               self::entryHeader($doc, $entry, $owner, $item, $toplevel);
 
                self::entryContent($doc, $entry, $item, $owner, $title);
 
@@ -1815,7 +1840,7 @@ class OStatus
                        logger("OStatus entry is from author ".$owner["url"]." - not from ".$item["author-link"].". Quitting.", LOGGER_DEBUG);
                }
 
-               $title = self::entryHeader($doc, $entry, $owner, $toplevel);
+               $title = self::entryHeader($doc, $entry, $owner, $item, $toplevel);
 
                XML::addElement($doc, $entry, "activity:object-type", ACTIVITY_OBJ_NOTE);
 
@@ -1836,12 +1861,18 @@ class OStatus
         *
         * @return string The title for the element
         */
-       private static function entryHeader($doc, &$entry, $owner, $toplevel)
+       private static function entryHeader($doc, &$entry, $owner, $item, $toplevel)
        {
                /// @todo Check if this title stuff is really needed (I guess not)
                if (!$toplevel) {
                        $entry = $doc->createElement("entry");
                        $title = sprintf("New note by %s", $owner["nick"]);
+
+                       if ($owner['account-type'] == ACCOUNT_TYPE_COMMUNITY) {
+                               $contact = self::contactEntry($item['author-link'], $owner);
+                               $author = self::addAuthor($doc, $contact, false);
+                               $entry->appendChild($author);
+                       }
                } else {
                        $entry = $doc->createElementNS(NAMESPACE_ATOM1, "entry");
 
@@ -1872,6 +1903,7 @@ class OStatus
         * @param string $title    Title for the post
         * @param string $verb     The activity verb
         * @param bool   $complete Add the "status_net" element?
+        * @return void
         */
        private static function entryContent($doc, $entry, $item, $owner, $title, $verb = "", $complete = true)
        {
@@ -1888,22 +1920,22 @@ class OStatus
                        $body = "[b]".$item['title']."[/b]\n\n".$body;
                }
 
-               $body = bbcode($body, false, false, 7);
+               $body = BBCode::convert($body, false, 7);
 
-               XML::addElement($doc, $entry, "content", $body, array("type" => "html"));
+               XML::addElement($doc, $entry, "content", $body, ["type" => "html"]);
 
-               XML::addElement($doc, $entry, "link", "", array("rel" => "alternate", "type" => "text/html",
-                                                               "href" => System::baseUrl()."/display/".$item["guid"])
+               XML::addElement($doc, $entry, "link", "", ["rel" => "alternate", "type" => "text/html",
+                                                               "href" => System::baseUrl()."/display/".$item["guid"]]
                );
 
                if ($complete && ($item["id"] > 0)) {
-                       XML::addElement($doc, $entry, "status_net", "", array("notice_id" => $item["id"]));
+                       XML::addElement($doc, $entry, "status_net", "", ["notice_id" => $item["id"]]);
                }
 
                XML::addElement($doc, $entry, "activity:verb", $verb);
 
-               XML::addElement($doc, $entry, "published", datetime_convert("UTC", "UTC", $item["created"]."+00:00", ATOM_TIME));
-               XML::addElement($doc, $entry, "updated", datetime_convert("UTC", "UTC", $item["edited"]."+00:00", ATOM_TIME));
+               XML::addElement($doc, $entry, "published", DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM));
+               XML::addElement($doc, $entry, "updated", DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM));
        }
 
        /**
@@ -1914,38 +1946,36 @@ class OStatus
         * @param array  $item     Data of the item that is to be posted
         * @param array  $owner    Contact data of the poster
         * @param bool   $complete default true
+        * @return void
         */
-       private static function entryFooter($doc, $entry, $item, $owner, $complete = true)
+       private static function entryFooter($doc, $entry, array $item, array $owner, $complete = true)
        {
-               $mentioned = array();
+               $mentioned = [];
 
                if (($item['parent'] != $item['id']) || ($item['parent-uri'] !== $item['uri']) || (($item['thr-parent'] !== '') && ($item['thr-parent'] !== $item['uri']))) {
-                       $parent = q("SELECT `guid`, `author-link`, `owner-link` FROM `item` WHERE `id` = %d", intval($item["parent"]));
+                       $parent = Item::selectFirst(['guid', 'author-link', 'owner-link'], ['id' => $item["parent"]]);
                        $parent_item = (($item['thr-parent']) ? $item['thr-parent'] : $item['parent-uri']);
 
-                       $thrparent = q(
-                               "SELECT `guid`, `author-link`, `owner-link`, `plink` FROM `item` WHERE `uid` = %d AND `uri` = '%s'",
-                               intval($owner["uid"]),
-                               dbesc($parent_item)
-                       );
-                       if ($thrparent) {
-                               $mentioned[$thrparent[0]["author-link"]] = $thrparent[0]["author-link"];
-                               $mentioned[$thrparent[0]["owner-link"]] = $thrparent[0]["owner-link"];
-                               $parent_plink = $thrparent[0]["plink"];
+                       $thrparent = Item::selectFirst(['guid', 'author-link', 'owner-link', 'plink'], ['uid' => $owner["uid"], 'uri' => $parent_item]);
+
+                       if (DBM::is_result($thrparent)) {
+                               $mentioned[$thrparent["author-link"]] = $thrparent["author-link"];
+                               $mentioned[$thrparent["owner-link"]] = $thrparent["owner-link"];
+                               $parent_plink = $thrparent["plink"];
                        } else {
-                               $mentioned[$parent[0]["author-link"]] = $parent[0]["author-link"];
-                               $mentioned[$parent[0]["owner-link"]] = $parent[0]["owner-link"];
-                               $parent_plink = System::baseUrl()."/display/".$parent[0]["guid"];
+                               $mentioned[$parent["author-link"]] = $parent["author-link"];
+                               $mentioned[$parent["owner-link"]] = $parent["owner-link"];
+                               $parent_plink = System::baseUrl()."/display/".$parent["guid"];
                        }
 
-                       $attributes = array(
+                       $attributes = [
                                        "ref" => $parent_item,
-                                       "href" => $parent_plink);
+                                       "href" => $parent_plink];
                        XML::addElement($doc, $entry, "thr:in-reply-to", "", $attributes);
 
-                       $attributes = array(
+                       $attributes = [
                                        "rel" => "related",
-                                       "href" => $parent_plink);
+                                       "href" => $parent_plink];
                        XML::addElement($doc, $entry, "link", "", $attributes);
                }
 
@@ -1954,28 +1984,28 @@ class OStatus
                        $conversation_uri = $conversation_href;
 
                        if (isset($parent_item)) {
-                               $r = dba::fetch_first("SELECT `conversation-uri`, `conversation-href` FROM `conversation` WHERE `item-uri` = ?", $parent_item);
-                               if (DBM::is_result($r)) {
-                                       if ($r['conversation-uri'] != '') {
-                                               $conversation_uri = $r['conversation-uri'];
+                               $conversation = dba::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $parent_item]);
+                               if (DBM::is_result($conversation)) {
+                                       if ($conversation['conversation-uri'] != '') {
+                                               $conversation_uri = $conversation['conversation-uri'];
                                        }
-                                       if ($r['conversation-href'] != '') {
-                                               $conversation_href = $r['conversation-href'];
+                                       if ($conversation['conversation-href'] != '') {
+                                               $conversation_href = $conversation['conversation-href'];
                                        }
                                }
                        }
 
-                       XML::addElement($doc, $entry, "link", "", array("rel" => "ostatus:conversation", "href" => $conversation_href));
+                       XML::addElement($doc, $entry, "link", "", ["rel" => "ostatus:conversation", "href" => $conversation_href]);
 
-                       $attributes = array(
+                       $attributes = [
                                        "href" => $conversation_href,
                                        "local_id" => $item["parent"],
-                                       "ref" => $conversation_uri);
+                                       "ref" => $conversation_uri];
 
                        XML::addElement($doc, $entry, "ostatus:conversation", $conversation_uri, $attributes);
                }
 
-               $tags = item_getfeedtags($item);
+               $tags = item::getFeedTags($item);
 
                if (count($tags)) {
                        foreach ($tags as $t) {
@@ -1986,7 +2016,7 @@ class OStatus
                }
 
                // Make sure that mentions are accepted (GNU Social has problems with mixing HTTP and HTTPS)
-               $newmentions = array();
+               $newmentions = [];
                foreach ($mentioned as $mention) {
                        $newmentions[str_replace("http://", "https://", $mention)] = str_replace("http://", "https://", $mention);
                        $newmentions[str_replace("https://", "http://", $mention)] = str_replace("https://", "http://", $mention);
@@ -1994,41 +2024,47 @@ class OStatus
                $mentioned = $newmentions;
 
                foreach ($mentioned as $mention) {
-                       $r = q(
-                               "SELECT `forum`, `prv` FROM `contact` WHERE `uid` = %d AND `nurl` = '%s'",
-                               intval($owner["uid"]),
-                               dbesc(normalise_link($mention))
-                       );
-                       if ($r[0]["forum"] || $r[0]["prv"]) {
+                       $condition = ['uid' => $owner['uid'], 'nurl' => normalise_link($mention)];
+                       $contact = dba::selectFirst('contact', ['forum', 'prv', 'self', 'contact-type'], $condition);
+                       if ($contact["forum"] || $contact["prv"] || ($owner['contact-type'] == ACCOUNT_TYPE_COMMUNITY) ||
+                               ($contact['self'] && ($owner['account-type'] == ACCOUNT_TYPE_COMMUNITY))) {
                                XML::addElement($doc, $entry, "link", "",
-                                       array(
+                                       [
                                                "rel" => "mentioned",
                                                "ostatus:object-type" => ACTIVITY_OBJ_GROUP,
-                                               "href" => $mention)
+                                               "href" => $mention]
                                );
                        } else {
                                XML::addElement($doc, $entry, "link", "",
-                                       array(
+                                       [
                                                "rel" => "mentioned",
                                                "ostatus:object-type" => ACTIVITY_OBJ_PERSON,
-                                               "href" => $mention)
+                                               "href" => $mention]
                                );
                        }
                }
 
+               if ($owner['account-type'] == ACCOUNT_TYPE_COMMUNITY) {
+                       XML::addElement($doc, $entry, "link", "", [
+                               "rel" => "mentioned",
+                               "ostatus:object-type" => "http://activitystrea.ms/schema/1.0/group",
+                               "href" => $owner['url']
+                       ]);
+               }
+
                if (!$item["private"]) {
-                       XML::addElement($doc, $entry, "link", "", array("rel" => "ostatus:attention",
-                                                                       "href" => "http://activityschema.org/collection/public"));
-                       XML::addElement($doc, $entry, "link", "", array("rel" => "mentioned",
+                       XML::addElement($doc, $entry, "link", "", ["rel" => "ostatus:attention",
+                                                                       "href" => "http://activityschema.org/collection/public"]);
+                       XML::addElement($doc, $entry, "link", "", ["rel" => "mentioned",
                                                                        "ostatus:object-type" => "http://activitystrea.ms/schema/1.0/collection",
-                                                                       "href" => "http://activityschema.org/collection/public"));
+                                                                       "href" => "http://activityschema.org/collection/public"]);
                        XML::addElement($doc, $entry, "mastodon:scope", "public");
                }
 
                if (count($tags)) {
                        foreach ($tags as $t) {
                                if ($t[0] != "@") {
-                                       XML::addElement($doc, $entry, "category", "", array("term" => $t[2]));
+                                       XML::addElement($doc, $entry, "category", "", ["term" => $t[2]]);
                                }
                        }
                }
@@ -2041,7 +2077,7 @@ class OStatus
                                $app = "web";
                        }
 
-                       $attributes = array("local_id" => $item["id"], "source" => $app);
+                       $attributes = ["local_id" => $item["id"], "source" => $app];
 
                        if (isset($parent["id"])) {
                                $attributes["repeat_of"] = $parent["id"];
@@ -2056,66 +2092,85 @@ class OStatus
        }
 
        /**
+        * Creates the XML feed for a given nickname
+        *
+        * Supported filters:
+        * - activity (default): all the public posts
+        * - posts: all the public top-level posts
+        * - comments: all the public replies
+        *
+        * Updates the provided last_update parameter if the result comes from the
+        * cache or it is empty
+        *
         * @brief Creates the XML feed for a given nickname
         *
-        * @param object  $a           The application class
         * @param string  $owner_nick  Nickname of the feed owner
         * @param string  $last_update Date of the last update
         * @param integer $max_items   Number of maximum items to fetch
+        * @param string  $filter      Feed items filter (activity, posts or comments)
+        * @param boolean $nocache     Wether to bypass caching
         *
         * @return string XML feed
         */
-       public static function feed(App $a, $owner_nick, &$last_update, $max_items = 300)
+       public static function feed($owner_nick, &$last_update, $max_items = 300, $filter = 'activity', $nocache = false)
        {
                $stamp = microtime(true);
 
-               $cachekey = "ostatus:feed:".$owner_nick.":".$last_update;
+               $owner = User::getOwnerDataByNick($owner_nick);
+               if (!$owner) {
+                       return;
+               }
+
+               $cachekey = "ostatus:feed:" . $owner_nick . ":" . $filter . ":" . $last_update;
 
                $previous_created = $last_update;
 
-               $result = Cache::get($cachekey);
-               if (!is_null($result)) {
-                       logger('Feed duration: '.number_format(microtime(true) - $stamp, 3).' - '.$owner_nick.' - '.$previous_created.' (cached)', LOGGER_DEBUG);
-                       $last_update = $result['last_update'];
-                       return $result['feed'];
+               // Don't cache when the last item was posted less then 15 minutes ago (Cache duration)
+               if ((time() - strtotime($owner['last-item'])) < 15*60) {
+                       $result = Cache::get($cachekey);
+                       if (!$nocache && !is_null($result)) {
+                               logger('Feed duration: ' . number_format(microtime(true) - $stamp, 3) . ' - ' . $owner_nick . ' - ' . $filter . ' - ' . $previous_created . ' (cached)', LOGGER_DEBUG);
+                               $last_update = $result['last_update'];
+                               return $result['feed'];
+                       }
                }
 
-               $r = q(
-                       "SELECT `contact`.*, `user`.`nickname`, `user`.`timezone`, `user`.`page-flags`
-                               FROM `contact` INNER JOIN `user` ON `user`.`uid` = `contact`.`uid`
-                               WHERE `contact`.`self` AND `user`.`nickname` = '%s' LIMIT 1",
-                       dbesc($owner_nick)
-               );
-               if (!DBM::is_result($r)) {
-                       return;
+               if (!strlen($last_update)) {
+                       $last_update = 'now -30 days';
                }
 
-               $owner = $r[0];
+               $check_date = DateTimeFormat::utc($last_update);
+               $authorid = Contact::getIdForURL($owner["url"], 0, true);
 
-               if (!strlen($last_update)) {
-                       $last_update = 'now -30 days';
+               $condition = ["`uid` = ? AND `created` > ? AND NOT `deleted`
+                       AND NOT `private` AND `visible` AND `wall` AND `parent-network` IN (?, ?)",
+                       $owner["uid"], $check_date, NETWORK_OSTATUS, NETWORK_DFRN];
+
+               if ($filter === 'comments') {
+                       $condition[0] .= " AND `object-type` = ? ";
+                       $condition[] = ACTIVITY_OBJ_COMMENT;
                }
 
-               $check_date = datetime_convert('UTC', 'UTC', $last_update, 'Y-m-d H:i:s');
-               $authorid = Contact::getIdForURL($owner["url"], 0);
-
-               $items = q(
-                       "SELECT `item`.*, `item`.`id` AS `item_id` FROM `item` USE INDEX (`uid_contactid_created`)
-                               STRAIGHT_JOIN `thread` ON `thread`.`iid` = `item`.`parent`
-                               WHERE `item`.`uid` = %d AND `item`.`contact-id` = %d AND
-                                       `item`.`author-id` = %d AND `item`.`created` > '%s' AND
-                                       NOT `item`.`deleted` AND NOT `item`.`private` AND
-                                       `thread`.`network` IN ('%s', '%s')
-                               ORDER BY `item`.`created` DESC LIMIT %d",
-                       intval($owner["uid"]), intval($owner["id"]),
-                       intval($authorid), dbesc($check_date),
-                       dbesc(NETWORK_OSTATUS), dbesc(NETWORK_DFRN), intval($max_items)
-               );
+               if ($owner['account-type'] != ACCOUNT_TYPE_COMMUNITY) {
+                       $condition[0] .= " AND `contact-id` = ? AND `author-id` = ?";
+                       $condition[] = $owner["id"];
+                       $condition[] = $authorid;
+               }
+
+               $params = ['order' => ['created' => true], 'limit' => $max_items];
+
+               if ($filter === 'posts') {
+                       $ret = Item::selectThread([], $condition, $params);
+               } else {
+                       $ret = Item::select([], $condition, $params);
+               }
+
+               $items = Item::inArray($ret);
 
                $doc = new DOMDocument('1.0', 'utf-8');
                $doc->formatOutput = true;
 
-               $root = self::addHeader($doc, $owner);
+               $root = self::addHeader($doc, $owner, $filter);
 
                foreach ($items as $item) {
                        if (Config::get('system', 'ostatus_debug')) {
@@ -2131,10 +2186,10 @@ class OStatus
 
                $feeddata = trim($doc->saveXML());
 
-               $msg = array('feed' => $feeddata, 'last_update' => $last_update);
+               $msg = ['feed' => $feeddata, 'last_update' => $last_update];
                Cache::set($cachekey, $msg, CACHE_QUARTER_HOUR);
 
-               logger('Feed duration: '.number_format(microtime(true) - $stamp, 3).' - '.$owner_nick.' - '.$previous_created, LOGGER_DEBUG);
+               logger('Feed duration: ' . number_format(microtime(true) - $stamp, 3) . ' - ' . $owner_nick . ' - ' . $filter . ' - ' . $previous_created, LOGGER_DEBUG);
 
                return $feeddata;
        }