]> git.mxchange.org Git - friendica.git/blobdiff - src/Model/Item.php
AP: Debug option to deliver via AP first
[friendica.git] / src / Model / Item.php
index f2b227a0dabded5ce3b38b2580b76443f7056894..b460d5f79fdf886364acfe50a0c7ddf99a4580e6 100644 (file)
@@ -8,26 +8,27 @@ namespace Friendica\Model;
 
 use Friendica\BaseObject;
 use Friendica\Content\Text\BBCode;
-use Friendica\Core\Addon;
+use Friendica\Content\Text\HTML;
 use Friendica\Core\Config;
+use Friendica\Core\Hook;
 use Friendica\Core\Lock;
+use Friendica\Core\Logger;
+use Friendica\Core\L10n;
 use Friendica\Core\PConfig;
+use Friendica\Core\Protocol;
+use Friendica\Core\Renderer;
 use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBA;
-use Friendica\Model\Contact;
-use Friendica\Model\PermissionSet;
-use Friendica\Object\Image;
 use Friendica\Protocol\Diaspora;
 use Friendica\Protocol\OStatus;
 use Friendica\Util\DateTimeFormat;
+use Friendica\Util\Map;
 use Friendica\Util\XML;
+use Friendica\Util\Security;
+use Friendica\Util\Strings;
 use Text_LanguageDetect;
 
-require_once 'boot.php';
-require_once 'include/items.php';
-require_once 'include/text.php';
-
 class Item extends BaseObject
 {
        // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
@@ -42,18 +43,21 @@ class Item extends BaseObject
        const PT_PERSONAL_NOTE = 128;
 
        // Field list that is used to display the items
-       const DISPLAY_FIELDLIST = ['uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid', 'network',
-                       'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
-                       'wall', 'private', 'starred', 'origin', 'title', 'body', 'file', 'attach', 'language',
-                       'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
-                       'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
-                       'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
-                       'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network',
-                       'contact-id', 'contact-link', 'contact-name', 'contact-avatar',
-                       'writable', 'self', 'cid', 'alias',
-                       'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
-                       'event-summary', 'event-desc', 'event-location', 'event-type',
-                       'event-nofinish', 'event-adjust', 'event-ignore', 'event-id'];
+       const DISPLAY_FIELDLIST = [
+               'uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid', 'network',
+               'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
+               'wall', 'private', 'starred', 'origin', 'title', 'body', 'file', 'attach', 'language',
+               'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
+               'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
+               'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
+               'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network',
+               'contact-id', 'contact-link', 'contact-name', 'contact-avatar',
+               'writable', 'self', 'cid', 'alias',
+               'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
+               'event-summary', 'event-desc', 'event-location', 'event-type',
+               'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
+               'delivery_queue_count', 'delivery_queue_done'
+       ];
 
        // Field list that is used to deliver items via the protocols
        const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid',
@@ -72,9 +76,6 @@ class Item extends BaseObject
        // Field list for "item-content" table that is not present in the "item" table
        const CONTENT_FIELDLIST = ['language'];
 
-       // Field list for additional delivery data
-       const DELIVERY_DATA_FIELDLIST = ['postopts', 'inform'];
-
        // All fields in the item table
        const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent', 'guid',
                        'contact-id', 'type', 'wall', 'gravity', 'extid', 'icid', 'iaid', 'psid',
@@ -109,7 +110,7 @@ class Item extends BaseObject
         * @param string $activity activity string
         * @return integer Activity index
         */
-       private static function activityToIndex($activity)
+       public static function activityToIndex($activity)
        {
                $index = array_search($activity, self::ACTIVITIES);
 
@@ -174,7 +175,7 @@ class Item extends BaseObject
 
                // We can always comment on posts from these networks
                if (array_key_exists('writable', $row) &&
-                       in_array($row['internal-network'], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS])) {
+                       in_array($row['internal-network'], [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS])) {
                        $row['writable'] = true;
                }
 
@@ -182,7 +183,7 @@ class Item extends BaseObject
 
                // Fetch data from the item-content table whenever there is content there
                if (self::isLegacyMode()) {
-                       $legacy_fields = array_merge(self::DELIVERY_DATA_FIELDLIST, self::MIXED_CONTENT_FIELDLIST);
+                       $legacy_fields = array_merge(ItemDeliveryData::LEGACY_FIELD_LIST, self::MIXED_CONTENT_FIELDLIST);
                        foreach ($legacy_fields as $field) {
                                if (empty($row[$field]) && !empty($row['internal-item-' . $field])) {
                                        $row[$field] = $row['internal-item-' . $field];
@@ -229,12 +230,22 @@ class Item extends BaseObject
                        }
                }
 
+               if (array_key_exists('signed_text', $row) && array_key_exists('interaction', $row) && !is_null($row['interaction'])) {
+                       $row['signed_text'] = $row['interaction'];
+               }
+
+               if (array_key_exists('ignored', $row) && array_key_exists('internal-user-ignored', $row) && !is_null($row['internal-user-ignored'])) {
+                       $row['ignored'] = $row['internal-user-ignored'];
+               }
+
                // Remove internal fields
                unset($row['internal-activity']);
                unset($row['internal-network']);
                unset($row['internal-iid']);
                unset($row['internal-iaid']);
                unset($row['internal-icid']);
+               unset($row['internal-user-ignored']);
+               unset($row['interaction']);
 
                return $row;
        }
@@ -243,6 +254,7 @@ class Item extends BaseObject
         * @brief Fills an array with data from an item query
         *
         * @param object $stmt statement object
+        * @param bool   $do_close
         * @return array Data array
         */
        public static function inArray($stmt, $do_close = true) {
@@ -266,6 +278,7 @@ class Item extends BaseObject
         * @param array $condition array of fields for condition
         *
         * @return boolean Are there rows for that condition?
+        * @throws \Exception
         */
        public static function exists($condition) {
                $stmt = self::select(['id'], $condition, ['limit' => 1]);
@@ -286,11 +299,12 @@ class Item extends BaseObject
         *
         * @brief Retrieve a single record from a table
         * @param integer $uid User ID
-        * @param array  $fields
-        * @param array  $condition
-        * @param array  $params
+        * @param array   $selected
+        * @param array   $condition
+        * @param array   $params
         * @return bool|array
-        * @see DBA::select
+        * @throws \Exception
+        * @see   DBA::select
         */
        public static function selectFirstForUser($uid, array $selected = [], array $condition = [], $params = [])
        {
@@ -306,12 +320,13 @@ class Item extends BaseObject
        /**
         * @brief Select rows from the item table for a given user
         *
-        * @param integer $uid User ID
-        * @param array  $selected  Array of selected fields, empty for all
-        * @param array  $condition Array of fields for condition
-        * @param array  $params    Array of several parameters
+        * @param integer $uid       User ID
+        * @param array   $selected  Array of selected fields, empty for all
+        * @param array   $condition Array of fields for condition
+        * @param array   $params    Array of several parameters
         *
         * @return boolean|object
+        * @throws \Exception
         */
        public static function selectForUser($uid, array $selected = [], array $condition = [], $params = [])
        {
@@ -328,11 +343,12 @@ class Item extends BaseObject
         * Retrieve a single record from the item table and returns it in an associative array
         *
         * @brief Retrieve a single record from a table
-        * @param array  $fields
-        * @param array  $condition
-        * @param array  $params
+        * @param array $fields
+        * @param array $condition
+        * @param array $params
         * @return bool|array
-        * @see DBA::select
+        * @throws \Exception
+        * @see   DBA::select
         */
        public static function selectFirst(array $fields = [], array $condition = [], $params = [])
        {
@@ -352,11 +368,12 @@ class Item extends BaseObject
        /**
         * @brief Select rows from the item table
         *
-        * @param array  $selected  Array of selected fields, empty for all
-        * @param array  $condition Array of fields for condition
-        * @param array  $params    Array of several parameters
+        * @param array $selected  Array of selected fields, empty for all
+        * @param array $condition Array of fields for condition
+        * @param array $params    Array of several parameters
         *
         * @return boolean|object
+        * @throws \Exception
         */
        public static function select(array $selected = [], array $condition = [], $params = [])
        {
@@ -368,7 +385,7 @@ class Item extends BaseObject
                        $usermode = true;
                }
 
-               $fields = self::fieldlist($selected);
+               $fields = self::fieldlist($usermode);
 
                $select_fields = self::constructSelectFields($fields, $selected);
 
@@ -392,12 +409,13 @@ class Item extends BaseObject
        /**
         * @brief Select rows from the starting post in the item table
         *
-        * @param integer $uid User ID
-        * @param array  $fields    Array of selected fields, empty for all
-        * @param array  $condition Array of fields for condition
-        * @param array  $params    Array of several parameters
+        * @param integer $uid       User ID
+        * @param array   $selected
+        * @param array   $condition Array of fields for condition
+        * @param array   $params    Array of several parameters
         *
         * @return boolean|object
+        * @throws \Exception
         */
        public static function selectThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
        {
@@ -415,11 +433,12 @@ class Item extends BaseObject
         *
         * @brief Retrieve a single record from a table
         * @param integer $uid User ID
-        * @param array  $selected
-        * @param array  $condition
-        * @param array  $params
+        * @param array   $selected
+        * @param array   $condition
+        * @param array   $params
         * @return bool|array
-        * @see DBA::select
+        * @throws \Exception
+        * @see   DBA::select
         */
        public static function selectFirstThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
        {
@@ -436,11 +455,12 @@ class Item extends BaseObject
         * Retrieve a single record from the starting post in the item table and returns it in an associative array
         *
         * @brief Retrieve a single record from a table
-        * @param array  $fields
-        * @param array  $condition
-        * @param array  $params
+        * @param array $fields
+        * @param array $condition
+        * @param array $params
         * @return bool|array
-        * @see DBA::select
+        * @throws \Exception
+        * @see   DBA::select
         */
        public static function selectFirstThread(array $fields = [], array $condition = [], $params = [])
        {
@@ -459,11 +479,12 @@ class Item extends BaseObject
        /**
         * @brief Select rows from the starting post in the item table
         *
-        * @param array  $selected  Array of selected fields, empty for all
-        * @param array  $condition Array of fields for condition
-        * @param array  $params    Array of several parameters
+        * @param array $selected  Array of selected fields, empty for all
+        * @param array $condition Array of fields for condition
+        * @param array $params    Array of several parameters
         *
         * @return boolean|object
+        * @throws \Exception
         */
        public static function selectThread(array $selected = [], array $condition = [], $params = [])
        {
@@ -475,7 +496,9 @@ class Item extends BaseObject
                        $usermode = true;
                }
 
-               $fields = self::fieldlist($selected);
+               $fields = self::fieldlist($usermode);
+
+               $fields['thread'] = ['mention', 'ignored', 'iid'];
 
                $threadfields = ['thread' => ['iid', 'uid', 'contact-id', 'owner-id', 'author-id',
                        'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private',
@@ -507,9 +530,10 @@ class Item extends BaseObject
        /**
         * @brief Returns a list of fields that are associated with the item table
         *
+        * @param $usermode
         * @return array field list
         */
-       private static function fieldlist($selected)
+       private static function fieldlist($usermode)
        {
                $fields = [];
 
@@ -523,18 +547,22 @@ class Item extends BaseObject
                        'network' => 'internal-network', 'icid' => 'internal-icid',
                        'iaid' => 'internal-iaid'];
 
+               if ($usermode) {
+                       $fields['user-item'] = ['ignored' => 'internal-user-ignored'];
+               }
+
                $fields['item-activity'] = ['activity', 'activity' => 'internal-activity'];
 
                $fields['item-content'] = array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST);
 
-               $fields['item-delivery-data'] = self::DELIVERY_DATA_FIELDLIST;
+               $fields['item-delivery-data'] = array_merge(ItemDeliveryData::LEGACY_FIELD_LIST, ItemDeliveryData::FIELD_LIST);
 
                $fields['permissionset'] = ['allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
 
-               $fields['author'] = ['url' => 'author-link', 'name' => 'author-name',
+               $fields['author'] = ['url' => 'author-link', 'name' => 'author-name', 'addr' => 'author-addr',
                        'thumb' => 'author-avatar', 'nick' => 'author-nick', 'network' => 'author-network'];
 
-               $fields['owner'] = ['url' => 'owner-link', 'name' => 'owner-name',
+               $fields['owner'] = ['url' => 'owner-link', 'name' => 'owner-name', 'addr' => 'owner-addr',
                        'thumb' => 'owner-avatar', 'nick' => 'owner-nick', 'network' => 'owner-network'];
 
                $fields['contact'] = ['url' => 'contact-link', 'name' => 'contact-name', 'thumb' => 'contact-avatar',
@@ -554,6 +582,8 @@ class Item extends BaseObject
 
                $fields['sign'] = ['signed_text', 'signature', 'signer'];
 
+               $fields['diaspora-interaction'] = ['interaction'];
+
                return $fields;
        }
 
@@ -571,16 +601,23 @@ class Item extends BaseObject
                } else {
                        $master_table = "`item`";
                }
-               return "$master_table.`visible` AND NOT $master_table.`deleted` AND NOT $master_table.`moderated` AND (`user-item`.`hidden` IS NULL OR NOT `user-item`.`hidden`) ";
+               return sprintf("$master_table.`visible` AND NOT $master_table.`deleted` AND NOT $master_table.`moderated`
+                       AND (`user-item`.`hidden` IS NULL OR NOT `user-item`.`hidden`)
+                       AND (`user-author`.`blocked` IS NULL OR NOT `user-author`.`blocked`)
+                       AND (`user-author`.`ignored` IS NULL OR NOT `user-author`.`ignored` OR `item`.`gravity` != %d)
+                       AND (`user-owner`.`blocked` IS NULL OR NOT `user-owner`.`blocked`)
+                       AND (`user-owner`.`ignored` IS NULL OR NOT `user-owner`.`ignored` OR `item`.`gravity` != %d) ",
+                       GRAVITY_PARENT, GRAVITY_PARENT);
        }
 
        /**
         * @brief Returns all needed "JOIN" commands for the "select" functions
         *
-        * @param integer $uid User ID
-        * @param string $sql_commands The parts of the built SQL commands in the "select" functions
-        * @param boolean $thread_mode Called for the items (false) or for the threads (true)
+        * @param integer $uid          User ID
+        * @param string  $sql_commands The parts of the built SQL commands in the "select" functions
+        * @param boolean $thread_mode  Called for the items (false) or for the threads (true)
         *
+        * @param         $user_mode
         * @return string The SQL joins for the "select" functions
         */
        private static function constructJoins($uid, $sql_commands, $thread_mode, $user_mode)
@@ -602,8 +639,10 @@ class Item extends BaseObject
                                OR `contact`.`self` OR `item`.`gravity` != %d OR `contact`.`uid` = 0)
                                STRAIGHT_JOIN `contact` AS `author` ON `author`.`id` = $master_table.`author-id` AND NOT `author`.`blocked`
                                STRAIGHT_JOIN `contact` AS `owner` ON `owner`.`id` = $master_table.`owner-id` AND NOT `owner`.`blocked`
-                               LEFT JOIN `user-item` ON `user-item`.`iid` = $master_table_key AND `user-item`.`uid` = %d",
-                               Contact::SHARING, Contact::FRIEND, GRAVITY_PARENT, intval($uid));
+                               LEFT JOIN `user-item` ON `user-item`.`iid` = $master_table_key AND `user-item`.`uid` = %d
+                               LEFT JOIN `user-contact` AS `user-author` ON `user-author`.`cid` = $master_table.`author-id` AND `user-author`.`uid` = %d
+                               LEFT JOIN `user-contact` AS `user-owner` ON `user-owner`.`cid` = $master_table.`owner-id` AND `user-owner`.`uid` = %d",
+                               Contact::SHARING, Contact::FRIEND, GRAVITY_PARENT, intval($uid), intval($uid), intval($uid));
                } else {
                        if (strpos($sql_commands, "`contact`.") !== false) {
                                $joins .= "LEFT JOIN `contact` ON `contact`.`id` = $master_table.`contact-id`";
@@ -632,12 +671,16 @@ class Item extends BaseObject
                        $joins .= " LEFT JOIN `sign` ON `sign`.`iid` = `item`.`id`";
                }
 
+               if (strpos($sql_commands, "`diaspora-interaction`.") !== false) {
+                       $joins .= " LEFT JOIN `diaspora-interaction` ON `diaspora-interaction`.`uri-id` = `item`.`uri-id`";
+               }
+
                if (strpos($sql_commands, "`item-activity`.") !== false) {
-                       $joins .= " LEFT JOIN `item-activity` ON `item-activity`.`id` = `item`.`iaid`";
+                       $joins .= " LEFT JOIN `item-activity` ON `item-activity`.`uri-id` = `item`.`uri-id`";
                }
 
                if (strpos($sql_commands, "`item-content`.") !== false) {
-                       $joins .= " LEFT JOIN `item-content` ON `item-content`.`id` = `item`.`icid`";
+                       $joins .= " LEFT JOIN `item-content` ON `item-content`.`uri-id` = `item`.`uri-id`";
                }
 
                if (strpos($sql_commands, "`item-delivery-data`.") !== false) {
@@ -680,11 +723,20 @@ class Item extends BaseObject
                        $selected[] = 'internal-activity';
                }
 
+               if (in_array('ignored', $selected)) {
+                       $selected[] = 'internal-user-ignored';
+               }
+
+               if (in_array('signed_text', $selected)) {
+                       $selected[] = 'interaction';
+               }
+
+               $legacy_fields = array_merge(ItemDeliveryData::LEGACY_FIELD_LIST, self::MIXED_CONTENT_FIELDLIST);
+
                $selection = [];
                foreach ($fields as $table => $table_fields) {
                        foreach ($table_fields as $field => $select) {
                                if (empty($selected) || in_array($select, $selected)) {
-                                       $legacy_fields = array_merge(self::DELIVERY_DATA_FIELDLIST, self::MIXED_CONTENT_FIELDLIST);
                                        if (self::isLegacyMode() && in_array($select, $legacy_fields)) {
                                                $selection[] = "`item`.`".$select."` AS `internal-item-" . $select . "`";
                                        }
@@ -725,23 +777,10 @@ class Item extends BaseObject
                return $query;
        }
 
-       /**
-        * @brief Generate a server unique item hash for linking between the item tables
-        *
-        * @param string $uri     Item URI
-        * @param date   $created Item creation date
-        *
-        * @return string the item hash
-        */
-       private static function itemHash($uri, $created)
-       {
-               return round(strtotime($created) / 100) . hash('ripemd128', $uri);
-       }
-
        /**
         * @brief Update existing item entries
         *
-        * @param array $fields The fields that are to be changed
+        * @param array $fields    The fields that are to be changed
         * @param array $condition The condition for finding the item entries
         *
         * In the future we may have to change permissions as well.
@@ -750,6 +789,7 @@ class Item extends BaseObject
         * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
         *
         * @return integer|boolean number of affected rows - or "false" if there was an error
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
         */
        public static function update(array $fields, array $condition)
        {
@@ -763,7 +803,7 @@ class Item extends BaseObject
                // We cannot simply expand the condition to check for origin entries
                // The condition needn't to be a simple array but could be a complex condition.
                // And we have to execute this query before the update to ensure to fetch the same data.
-               $items = DBA::select('item', ['id', 'origin', 'uri', 'created', 'uri-hash', 'iaid', 'icid', 'tag', 'file'], $condition);
+               $items = DBA::select('item', ['id', 'origin', 'uri', 'uri-id', 'iaid', 'icid', 'tag', 'file'], $condition);
 
                $content_fields = [];
                foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
@@ -777,7 +817,9 @@ class Item extends BaseObject
                        }
                }
 
-               $clear_fields = ['bookmark', 'type', 'author-name', 'author-avatar', 'author-link', 'owner-name', 'owner-avatar', 'owner-link'];
+               $delivery_data = ItemDeliveryData::extractFields($fields);
+
+               $clear_fields = ['bookmark', 'type', 'author-name', 'author-avatar', 'author-link', 'owner-name', 'owner-avatar', 'owner-link', 'postopts', 'inform'];
                foreach ($clear_fields as $field) {
                        if (array_key_exists($field, $fields)) {
                                $fields[$field] = null;
@@ -788,22 +830,16 @@ class Item extends BaseObject
                        $tags = $fields['tag'];
                        $fields['tag'] = null;
                } else {
-                       $tags = '';
+                       $tags = null;
                }
 
                if (array_key_exists('file', $fields)) {
                        $files = $fields['file'];
                        $fields['file'] = null;
                } else {
-                       $files = '';
+                       $files = null;
                }
 
-               $delivery_data = ['postopts' => defaults($fields, 'postopts', ''),
-                       'inform' => defaults($fields, 'inform', '')];
-
-               $fields['postopts'] = null;
-               $fields['inform'] = null;
-
                if (!empty($fields)) {
                        $success = DBA::update('item', $fields, $condition);
 
@@ -818,34 +854,11 @@ class Item extends BaseObject
                $rows = DBA::affectedRows();
 
                while ($item = DBA::fetch($items)) {
-
-                       // This part here can safely be removed when the legacy fields in the item had been removed
-                       if (empty($item['uri-hash']) && !empty($item['uri']) && !empty($item['created'])) {
-
-                               // Fetch the uri-hash from an existing item entry if there is one
-                               $item_condition = ["`uri` = ? AND `uri-hash` != ''", $item['uri']];
-                               $existing = DBA::selectfirst('item', ['uri-hash'], $item_condition);
-                               if (DBA::isResult($existing)) {
-                                       $item['uri-hash'] = $existing['uri-hash'];
-                               } else {
-                                       $item['uri-hash'] = self::itemHash($item['uri'], $item['created']);
-                               }
-
-                               DBA::update('item', ['uri-hash' => $item['uri-hash']], ['id' => $item['id']]);
-                               DBA::update('item-activity', ['uri-hash' => $item['uri-hash']], ["`uri` = ? AND `uri-hash` = ''", $item['uri']]);
-                               DBA::update('item-content', ['uri-plink-hash' => $item['uri-hash']], ["`uri` = ? AND `uri-plink-hash` = ''", $item['uri']]);
-                       }
-
                        if (!empty($item['iaid']) || (!empty($content_fields['verb']) && (self::activityToIndex($content_fields['verb']) >= 0))) {
-                               if (!empty($item['iaid'])) {
-                                       $update_condition = ['id' => $item['iaid']];
-                               } else {
-                                       $update_condition = ['uri-hash' => $item['uri-hash']];
-                               }
-                               self::updateActivity($content_fields, $update_condition);
+                               self::updateActivity($content_fields, ['uri-id' => $item['uri-id']]);
 
                                if (empty($item['iaid'])) {
-                                       $item_activity = DBA::selectFirst('item-activity', ['id'], ['uri-hash' => $item['uri-hash']]);
+                                       $item_activity = DBA::selectFirst('item-activity', ['id'], ['uri-id' => $item['uri-id']]);
                                        if (DBA::isResult($item_activity)) {
                                                $item_fields = ['iaid' => $item_activity['id'], 'icid' => null];
                                                foreach (self::MIXED_CONTENT_FIELDLIST as $field) {
@@ -869,15 +882,10 @@ class Item extends BaseObject
                                        }
                                }
                        } else {
-                               if (!empty($item['icid'])) {
-                                       $update_condition = ['id' => $item['icid']];
-                               } else {
-                                       $update_condition = ['uri-plink-hash' => $item['uri-hash']];
-                               }
-                               self::updateContent($content_fields, $update_condition);
+                               self::updateContent($content_fields, ['uri-id' => $item['uri-id']]);
 
                                if (empty($item['icid'])) {
-                                       $item_content = DBA::selectFirst('item-content', [], ['uri-plink-hash' => $item['uri-hash']]);
+                                       $item_content = DBA::selectFirst('item-content', [], ['uri-id' => $item['uri-id']]);
                                        if (DBA::isResult($item_content)) {
                                                $item_fields = ['icid' => $item_content['id']];
                                                // Clear all fields in the item table that have a content in the item-content table
@@ -895,21 +903,21 @@ class Item extends BaseObject
                                }
                        }
 
-                       if (!empty($tags)) {
+                       if (!is_null($tags)) {
                                Term::insertFromTagFieldByItemId($item['id'], $tags);
                                if (!empty($item['tag'])) {
                                        DBA::update('item', ['tag' => ''], ['id' => $item['id']]);
                                }
                        }
 
-                       if (!empty($files)) {
+                       if (!is_null($files)) {
                                Term::insertFromFileFieldByItemId($item['id'], $files);
                                if (!empty($item['file'])) {
                                        DBA::update('item', ['file' => ''], ['id' => $item['id']]);
                                }
                        }
 
-                       self::updateDeliveryData($item['id'], $delivery_data);
+                       ItemDeliveryData::update($item['id'], $delivery_data);
 
                        self::updateThread($item['id']);
 
@@ -928,13 +936,14 @@ class Item extends BaseObject
        /**
         * @brief Delete an item and notify others about it - if it was ours
         *
-        * @param array $condition The condition for finding the item entries
-        * @param integer $priority Priority for the notification
+        * @param array   $condition The condition for finding the item entries
+        * @param integer $priority  Priority for the notification
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
         */
        public static function delete($condition, $priority = PRIORITY_HIGH)
        {
-               $items = DBA::select('item', ['id'], $condition);
-               while ($item = DBA::fetch($items)) {
+               $items = self::select(['id'], $condition);
+               while ($item = self::fetch($items)) {
                        self::deleteById($item['id'], $priority);
                }
                DBA::close($items);
@@ -943,8 +952,9 @@ class Item extends BaseObject
        /**
         * @brief Delete an item for an user and notify others about it - if it was ours
         *
-        * @param array $condition The condition for finding the item entries
-        * @param integer $uid User who wants to delete this item
+        * @param array   $condition The condition for finding the item entries
+        * @param integer $uid       User who wants to delete this item
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
         */
        public static function deleteForUser($condition, $uid)
        {
@@ -952,15 +962,15 @@ class Item extends BaseObject
                        return;
                }
 
-               $items = DBA::select('item', ['id', 'uid'], $condition);
-               while ($item = DBA::fetch($items)) {
+               $items = self::select(['id', 'uid'], $condition);
+               while ($item = self::fetch($items)) {
                        // "Deleting" global items just means hiding them
                        if ($item['uid'] == 0) {
                                DBA::update('user-item', ['hidden' => true], ['iid' => $item['id'], 'uid' => $uid], true);
                        } elseif ($item['uid'] == $uid) {
                                self::deleteById($item['id'], PRIORITY_HIGH);
                        } else {
-                               logger('Wrong ownership. Not deleting item ' . $item['id']);
+                               Logger::log('Wrong ownership. Not deleting item ' . $item['id']);
                        }
                }
                DBA::close($items);
@@ -969,12 +979,13 @@ class Item extends BaseObject
        /**
         * @brief Delete an item and notify others about it - if it was ours
         *
-        * @param integer $item_id Item ID that should be delete
+        * @param integer $item_id  Item ID that should be delete
         * @param integer $priority Priority for the notification
         *
         * @return boolean success
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
         */
-       private static function deleteById($item_id, $priority = PRIORITY_HIGH)
+       public static function deleteById($item_id, $priority = PRIORITY_HIGH)
        {
                // locate item to be deleted
                $fields = ['id', 'uri', 'uid', 'parent', 'parent-uri', 'origin',
@@ -983,12 +994,12 @@ class Item extends BaseObject
                        'icid', 'iaid', 'psid'];
                $item = self::selectFirst($fields, ['id' => $item_id]);
                if (!DBA::isResult($item)) {
-                       logger('Item with ID ' . $item_id . " hasn't been found.", LOGGER_DEBUG);
+                       Logger::log('Item with ID ' . $item_id . " hasn't been found.", Logger::DEBUG);
                        return false;
                }
 
                if ($item['deleted']) {
-                       logger('Item with ID ' . $item_id . ' has already been deleted.', LOGGER_DEBUG);
+                       Logger::log('Item with ID ' . $item_id . ' has already been deleted.', Logger::DEBUG);
                        return false;
                }
 
@@ -1001,18 +1012,20 @@ class Item extends BaseObject
 
                $matches = false;
                $cnt = preg_match_all('/<(.*?)>/', $item['file'], $matches, PREG_SET_ORDER);
+
                if ($cnt) {
                        foreach ($matches as $mtch) {
-                               file_tag_unsave_file($item['uid'], $item['id'], $mtch[1],true);
+                               FileTag::unsaveFile($item['uid'], $item['id'], $mtch[1],true);
                        }
                }
 
                $matches = false;
 
                $cnt = preg_match_all('/\[(.*?)\]/', $item['file'], $matches, PREG_SET_ORDER);
+
                if ($cnt) {
                        foreach ($matches as $mtch) {
-                               file_tag_unsave_file($item['uid'], $item['id'], $mtch[1],false);
+                               FileTag::unsaveFile($item['uid'], $item['id'], $mtch[1],false);
                        }
                }
 
@@ -1022,8 +1035,9 @@ class Item extends BaseObject
                 * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
                 * generate a resource-id and therefore aren't intimately linked to the item.
                 */
+               /// @TODO: this should first check if photo is used elsewhere
                if (strlen($item['resource-id'])) {
-                       DBA::delete('photo', ['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
+                       Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
                }
 
                // If item is a link to an event, delete the event.
@@ -1032,10 +1046,11 @@ class Item extends BaseObject
                }
 
                // If item has attachments, drop them
-               foreach (explode(", ", $item['attach']) as $attach) {
+               /// @TODO: this should first check if attachment is used elsewhere
+               foreach (explode(",", $item['attach']) as $attach) {
                        preg_match("|attach/(\d+)|", $attach, $matches);
                        if (is_array($matches) && count($matches) > 1) {
-                               DBA::delete('attach', ['id' => $matches[1], 'uid' => $item['uid']]);
+                               Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
                        }
                }
 
@@ -1054,18 +1069,17 @@ class Item extends BaseObject
                        self::delete(['uri' => $item['uri'], 'uid' => 0, 'deleted' => false], $priority);
                }
 
-               DBA::delete('item-delivery-data', ['iid' => $item['id']]);
+               ItemDeliveryData::delete($item['id']);
 
-               if (!empty($item['iaid']) && !DBA::exists('item', ['iaid' => $item['iaid'], 'deleted' => false])) {
-                       DBA::delete('item-activity', ['id' => $item['iaid']], ['cascade' => false]);
-               }
-               if (!empty($item['icid']) && !DBA::exists('item', ['icid' => $item['icid'], 'deleted' => false])) {
+               // We don't delete the item-activity here, since we need some of the data for ActivityPub
+
+               if (!empty($item['icid']) && !self::exists(['icid' => $item['icid'], 'deleted' => false])) {
                        DBA::delete('item-content', ['id' => $item['icid']], ['cascade' => false]);
                }
                // When the permission set will be used in photo and events as well,
                // this query here needs to be extended.
-               if (!empty($item['psid']) && !DBA::exists('item', ['psid' => $item['psid'], 'deleted' => false])) {
-                       DBA::delete('permissionset', ['id' => $item['psid']]);
+               if (!empty($item['psid']) && !self::exists(['psid' => $item['psid'], 'deleted' => false])) {
+                       DBA::delete('permissionset', ['id' => $item['psid']], ['cascade' => false]);
                }
 
                // If it's the parent of a comment thread, kill all the kids
@@ -1090,7 +1104,7 @@ class Item extends BaseObject
                        }
                }
 
-               logger('Item with ID ' . $item_id . " has been deleted.", LOGGER_DEBUG);
+               Logger::log('Item with ID ' . $item_id . " has been deleted.", Logger::DEBUG);
 
                return true;
        }
@@ -1136,13 +1150,13 @@ class Item extends BaseObject
        private static function guid($item, $notify)
        {
                if (!empty($item['guid'])) {
-                       return notags(trim($item['guid']));
+                       return Strings::escapeTags(trim($item['guid']));
                }
 
                if ($notify) {
                        // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
                        // We add the hash of our own host because our host is the original creator of the post.
-                       $prefix_host = get_app()->get_hostname();
+                       $prefix_host = \get_app()->getHostName();
                } else {
                        $prefix_host = '';
 
@@ -1180,7 +1194,7 @@ class Item extends BaseObject
                } elseif (!empty($item['uri'])) {
                        $guid = self::guidFromUri($item['uri'], $prefix_host);
                } else {
-                       $guid = System::createGUID(32, hash('crc32', $prefix_host));
+                       $guid = System::createUUID(hash('crc32', $prefix_host));
                }
 
                return $guid;
@@ -1193,7 +1207,7 @@ class Item extends BaseObject
                if (!empty($contact_id)) {
                        return $contact_id;
                }
-               logger('Missing contact-id. Called by: '.System::callstack(), LOGGER_DEBUG);
+               Logger::log('Missing contact-id. Called by: '.System::callstack(), Logger::DEBUG);
                /*
                 * First we are looking for a suitable contact that matches with the author of the post
                 * This is done only for comments
@@ -1214,7 +1228,7 @@ class Item extends BaseObject
                                $contact_id = $self["id"];
                        }
                }
-               logger("Contact-id was missing for post ".$item['guid']." from user id ".$item['uid']." - now set to ".$contact_id, LOGGER_DEBUG);
+               Logger::log("Contact-id was missing for post ".$item['guid']." from user id ".$item['uid']." - now set to ".$contact_id, Logger::DEBUG);
 
                return $contact_id;
        }
@@ -1222,36 +1236,43 @@ class Item extends BaseObject
        // This function will finally cover most of the preparation functionality in mod/item.php
        public static function prepare(&$item)
        {
+               /*
+                * @TODO: Unused code triggering inspection errors
+                *
                $data = BBCode::getAttachmentData($item['body']);
                if ((preg_match_all("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $item['body'], $match, PREG_SET_ORDER) || isset($data["type"]))
                        && ($posttype != Item::PT_PERSONAL_NOTE)) {
                        $posttype = Item::PT_PAGE;
                        $objecttype = ACTIVITY_OBJ_BOOKMARK;
                }
+                */
        }
 
        public static function insert($item, $force_parent = false, $notify = false, $dontcache = false)
        {
-               $a = get_app();
+               $orig_item = $item;
+
+               $priority = PRIORITY_HIGH;
 
                // If it is a posting where users should get notifications, then define it as wall posting
                if ($notify) {
                        $item['wall'] = 1;
                        $item['origin'] = 1;
-                       $item['network'] = NETWORK_DFRN;
-                       $item['protocol'] = PROTOCOL_DFRN;
+                       $item['network'] = Protocol::DFRN;
+                       $item['protocol'] = Conversation::PARCEL_DFRN;
 
                        if (is_int($notify)) {
                                $priority = $notify;
-                       } else {
-                               $priority = PRIORITY_HIGH;
                        }
                } else {
-                       $item['network'] = trim(defaults($item, 'network', NETWORK_PHANTOM));
+                       $item['network'] = trim(defaults($item, 'network', Protocol::PHANTOM));
                }
 
                $item['guid'] = self::guid($item, $notify);
-               $item['uri'] = notags(trim(defaults($item, 'uri', self::newURI($item['uid'], $item['guid']))));
+               $item['uri'] = Strings::escapeTags(trim(defaults($item, 'uri', self::newURI($item['uid'], $item['guid']))));
+
+               // Store URI data
+               $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 
                // Store conversation data
                $item = Conversation::insert($item);
@@ -1262,22 +1283,21 @@ class Item extends BaseObject
                 */
 
                $dsprsig = null;
-               if (x($item, 'dsprsig')) {
+               if (isset($item['dsprsig'])) {
                        $encoded_signature = $item['dsprsig'];
                        $dsprsig = json_decode(base64_decode($item['dsprsig']));
                        unset($item['dsprsig']);
                }
 
-               if (!empty($item['diaspora_signed_text'])) {
+               $diaspora_signed_text = '';
+               if (isset($item['diaspora_signed_text'])) {
                        $diaspora_signed_text = $item['diaspora_signed_text'];
                        unset($item['diaspora_signed_text']);
-               } else {
-                       $diaspora_signed_text = '';
                }
 
                // Converting the plink
                /// @TODO Check if this is really still needed
-               if ($item['network'] == NETWORK_OSTATUS) {
+               if ($item['network'] == Protocol::OSTATUS) {
                        if (isset($item['plink'])) {
                                $item['plink'] = OStatus::convertHref($item['plink']);
                        } elseif (isset($item['uri'])) {
@@ -1297,7 +1317,7 @@ class Item extends BaseObject
                        $item['gravity'] = GRAVITY_COMMENT;
                } else {
                        $item['gravity'] = GRAVITY_UNKNOWN;   // Should not happen
-                       logger('Unknown gravity for verb: ' . $item['verb'], LOGGER_DEBUG);
+                       Logger::log('Unknown gravity for verb: ' . $item['verb'], Logger::DEBUG);
                }
 
                $uid = intval($item['uid']);
@@ -1314,7 +1334,7 @@ class Item extends BaseObject
                        $expire_date = time() - ($expire_interval * 86400);
                        $created_date = strtotime($item['created']);
                        if ($created_date < $expire_date) {
-                               logger('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true), LOGGER_DEBUG);
+                               Logger::log('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true), Logger::DEBUG);
                                return 0;
                        }
                }
@@ -1324,28 +1344,21 @@ class Item extends BaseObject
                 * We have to check several networks since Friendica posts could be repeated
                 * via OStatus (maybe Diasporsa as well)
                 */
-               if (in_array($item['network'], [NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS, ""])) {
+               if (in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS, ""])) {
                        $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?)",
                                trim($item['uri']), $item['uid'],
-                               NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS];
+                               Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
                        $existing = self::selectFirst(['id', 'network'], $condition);
                        if (DBA::isResult($existing)) {
                                // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
                                if ($uid != 0) {
-                                       logger("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
+                                       Logger::log("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
                                }
 
                                return $existing["id"];
                        }
                }
 
-               // Ensure to always have the same creation date.
-               $existing = DBA::selectfirst('item', ['created', 'uri-hash'], ['uri' => $item['uri']]);
-               if (DBA::isResult($existing)) {
-                       $item['created'] = $existing['created'];
-                       $item['uri-hash'] = $existing['uri-hash'];
-               }
-
                $item['wall']          = intval(defaults($item, 'wall', 0));
                $item['extid']         = trim(defaults($item, 'extid', ''));
                $item['author-name']   = trim(defaults($item, 'author-name', ''));
@@ -1354,15 +1367,15 @@ class Item extends BaseObject
                $item['owner-name']    = trim(defaults($item, 'owner-name', ''));
                $item['owner-link']    = trim(defaults($item, 'owner-link', ''));
                $item['owner-avatar']  = trim(defaults($item, 'owner-avatar', ''));
-               $item['received']      = ((x($item, 'received') !== false) ? DateTimeFormat::utc($item['received']) : DateTimeFormat::utcNow());
-               $item['created']       = ((x($item, 'created') !== false) ? DateTimeFormat::utc($item['created']) : $item['received']);
-               $item['edited']        = ((x($item, 'edited') !== false) ? DateTimeFormat::utc($item['edited']) : $item['created']);
-               $item['changed']       = ((x($item, 'changed') !== false) ? DateTimeFormat::utc($item['changed']) : $item['created']);
-               $item['commented']     = ((x($item, 'commented') !== false) ? DateTimeFormat::utc($item['commented']) : $item['created']);
+               $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
+               $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
+               $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
+               $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
+               $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
                $item['title']         = trim(defaults($item, 'title', ''));
                $item['location']      = trim(defaults($item, 'location', ''));
                $item['coord']         = trim(defaults($item, 'coord', ''));
-               $item['visible']       = ((x($item, 'visible') !== false) ? intval($item['visible'])         : 1);
+               $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
                $item['deleted']       = 0;
                $item['parent-uri']    = trim(defaults($item, 'parent-uri', $item['uri']));
                $item['post-type']     = defaults($item, 'post-type', self::PT_ARTICLE);
@@ -1388,12 +1401,9 @@ class Item extends BaseObject
                $item['inform']        = trim(defaults($item, 'inform', ''));
                $item['file']          = trim(defaults($item, 'file', ''));
 
-               // Unique identifier to be linked against item-activities and item-content
-               $item['uri-hash']      = defaults($item, 'uri-hash', self::itemHash($item['uri'], $item['created']));
-
                // When there is no content then we don't post it
                if ($item['body'].$item['title'] == '') {
-                       logger('No body, no title.');
+                       Logger::log('No body, no title.');
                        return 0;
                }
 
@@ -1420,7 +1430,7 @@ class Item extends BaseObject
                $item['author-id'] = defaults($item, 'author-id', Contact::getIdForURL($item["author-link"], 0, false, $default));
 
                if (Contact::isBlocked($item["author-id"])) {
-                       logger('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
+                       Logger::log('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
                        return 0;
                }
 
@@ -1430,31 +1440,22 @@ class Item extends BaseObject
                $item['owner-id'] = defaults($item, 'owner-id', Contact::getIdForURL($item["owner-link"], 0, false, $default));
 
                if (Contact::isBlocked($item["owner-id"])) {
-                       logger('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
+                       Logger::log('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
                        return 0;
                }
 
-               // These fields aren't stored anymore in the item table, they are fetched upon request
-               unset($item['author-link']);
-               unset($item['author-name']);
-               unset($item['author-avatar']);
-
-               unset($item['owner-link']);
-               unset($item['owner-name']);
-               unset($item['owner-avatar']);
+               if ($item['network'] == Protocol::PHANTOM) {
+                       Logger::log('Missing network. Called by: '.System::callstack(), Logger::DEBUG);
 
-               if ($item['network'] == NETWORK_PHANTOM) {
-                       logger('Missing network. Called by: '.System::callstack(), LOGGER_DEBUG);
-
-                       $item['network'] = NETWORK_DFRN;
-                       logger("Set network to " . $item["network"] . " for " . $item["uri"], LOGGER_DEBUG);
+                       $item['network'] = Protocol::DFRN;
+                       Logger::log("Set network to " . $item["network"] . " for " . $item["uri"], Logger::DEBUG);
                }
 
                // Checking if there is already an item with the same guid
-               logger('Checking for an item for user '.$item['uid'].' on network '.$item['network'].' with the guid '.$item['guid'], LOGGER_DEBUG);
+               Logger::log('Checking for an item for user '.$item['uid'].' on network '.$item['network'].' with the guid '.$item['guid'], Logger::DEBUG);
                $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
                if (self::exists($condition)) {
-                       logger('found item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network'], LOGGER_DEBUG);
+                       Logger::log('found item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network'], Logger::DEBUG);
                        return 0;
                }
 
@@ -1535,15 +1536,15 @@ class Item extends BaseObject
                                }
 
                                // If its a post from myself then tag the thread as "mention"
-                               logger("Checking if parent ".$parent_id." has to be tagged as mention for user ".$item['uid'], LOGGER_DEBUG);
+                               Logger::log("Checking if parent ".$parent_id." has to be tagged as mention for user ".$item['uid'], Logger::DEBUG);
                                $user = DBA::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
                                if (DBA::isResult($user)) {
-                                       $self = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
+                                       $self = Strings::normaliseLink(System::baseUrl() . '/profile/' . $user['nickname']);
                                        $self_id = Contact::getIdForURL($self, 0, true);
-                                       logger("'myself' is ".$self_id." for parent ".$parent_id." checking against ".$item['author-id']." and ".$item['owner-id'], LOGGER_DEBUG);
+                                       Logger::log("'myself' is ".$self_id." for parent ".$parent_id." checking against ".$item['author-id']." and ".$item['owner-id'], Logger::DEBUG);
                                        if (($item['author-id'] == $self_id) || ($item['owner-id'] == $self_id)) {
                                                DBA::update('thread', ['mention' => true], ['iid' => $parent_id]);
-                                               logger("tagged thread ".$parent_id." as mention for user ".$self, LOGGER_DEBUG);
+                                               Logger::log("tagged thread ".$parent_id." as mention for user ".$self, Logger::DEBUG);
                                        }
                                }
                        } else {
@@ -1552,12 +1553,12 @@ class Item extends BaseObject
                                 * we don't have or can't see the original post.
                                 */
                                if ($force_parent) {
-                                       logger('$force_parent=true, reply converted to top-level post.');
+                                       Logger::log('$force_parent=true, reply converted to top-level post.');
                                        $parent_id = 0;
                                        $item['parent-uri'] = $item['uri'];
                                        $item['gravity'] = GRAVITY_PARENT;
                                } else {
-                                       logger('item parent '.$item['parent-uri'].' for '.$item['uid'].' was not found - ignoring item');
+                                       Logger::log('item parent '.$item['parent-uri'].' for '.$item['uid'].' was not found - ignoring item');
                                        return 0;
                                }
 
@@ -1565,18 +1566,21 @@ class Item extends BaseObject
                        }
                }
 
+               $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
+               $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
+
                $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
-                       $item['uri'], $item['network'], NETWORK_DFRN, $item['uid']];
+                       $item['uri'], $item['network'], Protocol::DFRN, $item['uid']];
                if (self::exists($condition)) {
-                       logger('duplicated item with the same uri found. '.print_r($item,true));
+                       Logger::log('duplicated item with the same uri found. '.print_r($item,true));
                        return 0;
                }
 
                // On Friendica and Diaspora the GUID is unique
-               if (in_array($item['network'], [NETWORK_DFRN, NETWORK_DIASPORA])) {
+               if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
                        $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
                        if (self::exists($condition)) {
-                               logger('duplicated item with the same guid found. '.print_r($item,true));
+                               Logger::log('duplicated item with the same guid found. '.print_r($item,true));
                                return 0;
                        }
                } else {
@@ -1584,7 +1588,7 @@ class Item extends BaseObject
                        $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
                                        $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
                        if (self::exists($condition)) {
-                               logger('duplicated item with the same body found. '.print_r($item,true));
+                               Logger::log('duplicated item with the same body found. '.print_r($item,true));
                                return 0;
                        }
                }
@@ -1594,7 +1598,7 @@ class Item extends BaseObject
                        $item["global"] = true;
 
                        // Set the global flag on all items if this was a global item entry
-                       DBA::update('item', ['global' => true], ['uri' => $item["uri"]]);
+                       self::update(['global' => true], ['uri' => $item["uri"]]);
                } else {
                        $item["global"] = self::exists(['uid' => 0, 'uri' => $item["uri"]]);
                }
@@ -1614,24 +1618,24 @@ class Item extends BaseObject
                $item["deleted"] = $parent_deleted;
 
                // Fill the cache field
-               put_item_in_cache($item);
+               self::putInCache($item);
 
                if ($notify) {
                        $item['edit'] = false;
                        $item['parent'] = $parent_id;
-                       Addon::callHooks('post_local', $item);
+                       Hook::callAll('post_local', $item);
                        unset($item['edit']);
                        unset($item['parent']);
                } else {
-                       Addon::callHooks('post_remote', $item);
+                       Hook::callAll('post_remote', $item);
                }
 
                // This array field is used to trigger some automatic reactions
                // It is mainly used in the "post_local" hook.
                unset($item['api_source']);
 
-               if (x($item, 'cancel')) {
-                       logger('post cancelled by addon.');
+               if (!empty($item['cancel'])) {
+                       Logger::log('post cancelled by addon.');
                        return 0;
                }
 
@@ -1642,12 +1646,12 @@ class Item extends BaseObject
                 */
                if ($item["uid"] == 0) {
                        if (self::exists(['uri' => trim($item['uri']), 'uid' => 0])) {
-                               logger('Global item already stored. URI: '.$item['uri'].' on network '.$item['network'], LOGGER_DEBUG);
+                               Logger::log('Global item already stored. URI: '.$item['uri'].' on network '.$item['network'], Logger::DEBUG);
                                return 0;
                        }
                }
 
-               logger('' . print_r($item,true), LOGGER_DATA);
+               Logger::log('' . print_r($item,true), Logger::DATA);
 
                if (array_key_exists('tag', $item)) {
                        $tags = $item['tag'];
@@ -1671,12 +1675,20 @@ class Item extends BaseObject
                        self::insertContent($item);
                }
 
-               $delivery_data = ['postopts' => defaults($item, 'postopts', ''),
-                       'inform' => defaults($item, 'inform', '')];
+               $delivery_data = ItemDeliveryData::extractFields($item);
 
                unset($item['postopts']);
                unset($item['inform']);
 
+               // These fields aren't stored anymore in the item table, they are fetched upon request
+               unset($item['author-link']);
+               unset($item['author-name']);
+               unset($item['author-avatar']);
+
+               unset($item['owner-link']);
+               unset($item['owner-name']);
+               unset($item['owner-avatar']);
+
                DBA::transaction();
                $ret = DBA::insert('item', $item);
 
@@ -1702,18 +1714,15 @@ class Item extends BaseObject
                        if ($spoolpath != "") {
                                $spool = $spoolpath.'/'.$file;
 
-                               // Ensure to have the removed data from above again in the item array
-                               $item = array_merge($item, $delivery_data);
-
-                               file_put_contents($spool, json_encode($item));
-                               logger("Item wasn't stored - Item was spooled into file ".$file, LOGGER_DEBUG);
+                               file_put_contents($spool, json_encode($orig_item));
+                               Logger::log("Item wasn't stored - Item was spooled into file ".$file, Logger::DEBUG);
                        }
                        return 0;
                }
 
                if ($current_post == 0) {
                        // This is one of these error messages that never should occur.
-                       logger("couldn't find created item - we better quit now.");
+                       Logger::log("couldn't find created item - we better quit now.");
                        DBA::rollback();
                        return 0;
                }
@@ -1724,7 +1733,7 @@ class Item extends BaseObject
 
                if ($entries > 1) {
                        // There are duplicates. We delete our just created entry.
-                       logger('Duplicated post occurred. uri = ' . $item['uri'] . ' uid = ' . $item['uid']);
+                       Logger::log('Duplicated post occurred. uri = ' . $item['uri'] . ' uid = ' . $item['uid']);
 
                        // Yes, we could do a rollback here - but we are having many users with MyISAM.
                        DBA::delete('item', ['id' => $current_post]);
@@ -1732,12 +1741,12 @@ class Item extends BaseObject
                        return 0;
                } elseif ($entries == 0) {
                        // This really should never happen since we quit earlier if there were problems.
-                       logger("Something is terribly wrong. We haven't found our created entry.");
+                       Logger::log("Something is terribly wrong. We haven't found our created entry.");
                        DBA::rollback();
                        return 0;
                }
 
-               logger('created item '.$current_post);
+               Logger::log('created item '.$current_post);
                self::updateContact($item);
 
                if (!$parent_id || ($item['parent-uri'] === $item['uri'])) {
@@ -1745,7 +1754,7 @@ class Item extends BaseObject
                }
 
                // Set parent id
-               DBA::update('item', ['parent' => $parent_id], ['id' => $current_post]);
+               self::update(['parent' => $parent_id], ['id' => $current_post]);
 
                $item['id'] = $current_post;
                $item['parent'] = $parent_id;
@@ -1753,9 +1762,9 @@ class Item extends BaseObject
                // update the commented timestamp on the parent
                // Only update "commented" if it is really a comment
                if (($item['gravity'] != GRAVITY_ACTIVITY) || !Config::get("system", "like_no_comment")) {
-                       DBA::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
+                       self::update(['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
                } else {
-                       DBA::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
+                       self::update(['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
                }
 
                if ($dsprsig) {
@@ -1765,35 +1774,38 @@ class Item extends BaseObject
                         */
                        if (base64_encode(base64_decode(base64_decode($dsprsig->signature))) == base64_decode($dsprsig->signature)) {
                                $dsprsig->signature = base64_decode($dsprsig->signature);
-                               logger("Repaired double encoded signature from handle ".$dsprsig->signer, LOGGER_DEBUG);
+                               Logger::log("Repaired double encoded signature from handle ".$dsprsig->signer, Logger::DEBUG);
                        }
 
-                       DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
-                                               'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
+                       if (!empty($dsprsig->signed_text) && empty($dsprsig->signature) && empty($dsprsig->signer)) {
+                               DBA::insert('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $dsprsig->signed_text], true);
+                       } else {
+                               // The other fields are used by very old Friendica servers, so we currently store them differently
+                               DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
+                                       'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
+                       }
                }
 
                if (!empty($diaspora_signed_text)) {
-                       // Formerly we stored the signed text, the signature and the author in different fields.
-                       // We now store the raw data so that we are more flexible.
-                       DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $diaspora_signed_text]);
+                       DBA::insert('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $diaspora_signed_text], true);
                }
 
-               $deleted = self::tagDeliver($item['uid'], $current_post);
+               self::tagDeliver($item['uid'], $current_post);
 
                /*
                 * current post can be deleted if is for a community page and no mention are
                 * in it.
                 */
-               if (!$deleted && !$dontcache) {
+               if (!$dontcache) {
                        $posted_item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
                        if (DBA::isResult($posted_item)) {
                                if ($notify) {
-                                       Addon::callHooks('post_local_end', $posted_item);
+                                       Hook::callAll('post_local_end', $posted_item);
                                } else {
-                                       Addon::callHooks('post_remote_end', $posted_item);
+                                       Hook::callAll('post_remote_end', $posted_item);
                                }
                        } else {
-                               logger('new item not found in DB, id ' . $current_post);
+                               Logger::log('new item not found in DB, id ' . $current_post);
                        }
                }
 
@@ -1803,9 +1815,7 @@ class Item extends BaseObject
                        self::updateThread($parent_id);
                }
 
-               $delivery_data['iid'] = $current_post;
-
-               self::insertDeliveryData($delivery_data);
+               ItemDeliveryData::insert($current_post, $delivery_data);
 
                DBA::commit();
 
@@ -1830,47 +1840,28 @@ class Item extends BaseObject
                check_user_notification($current_post);
 
                if ($notify) {
-                       Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", $notify_type, $current_post);
-               } elseif (!empty($parent) && $parent['origin']) {
-                       Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], "Notifier", "comment-import", $current_post);
-               }
-
-               return $current_post;
-       }
-
-       /**
-        * @brief Insert a new item delivery data entry
-        *
-        * @param array $item The item fields that are to be inserted
-        */
-       private static function insertDeliveryData($delivery_data)
-       {
-               if (empty($delivery_data['iid']) || (empty($delivery_data['postopts']) && empty($delivery_data['inform']))) {
-                       return;
-               }
-
-               DBA::insert('item-delivery-data', $delivery_data);
-       }
+                       Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, $current_post);
+               } elseif ($item['visible'] && ((!empty($parent) && $parent['origin']) || $item['origin'])) {
+                       if ($item['gravity'] == GRAVITY_ACTIVITY) {
+                               $cmd = $item['origin'] ? 'activity-new' : 'activity-import';
+                       } elseif ($item['gravity'] == GRAVITY_COMMENT) {
+                               $cmd = $item['origin'] ? 'comment-new' : 'comment-import';
+                       } else {
+                               $cmd = 'wall-new';
+                       }
 
-       /**
-        * @brief Update an existing item delivery data entry
-        *
-        * @param integer $id The item id that is to be updated
-        * @param array $item The item fields that are to be inserted
-        */
-       private static function updateDeliveryData($id, $delivery_data)
-       {
-               if (empty($id) || (empty($delivery_data['postopts']) && empty($delivery_data['inform']))) {
-                       return;
+                       Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $cmd, $current_post);
                }
 
-               DBA::update('item-delivery-data', $delivery_data, ['iid' => $id], true);
+               return $current_post;
        }
 
        /**
         * @brief Insert a new item content entry
         *
         * @param array $item The item fields that are to be inserted
+        * @return bool
+        * @throws \Exception
         */
        private static function insertActivity(&$item)
        {
@@ -1880,8 +1871,7 @@ class Item extends BaseObject
                        return false;
                }
 
-               $fields = ['uri' => $item['uri'], 'activity' => $activity_index,
-                       'uri-hash' => $item['uri-hash']];
+               $fields = ['activity' => $activity_index, 'uri-hash' => (string)$item['uri-id'], 'uri-id' => $item['uri-id']];
 
                // We just remove everything that is content
                foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
@@ -1891,20 +1881,21 @@ class Item extends BaseObject
                // To avoid timing problems, we are using locks.
                $locked = Lock::acquire('item_insert_activity');
                if (!$locked) {
-                       logger("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
+                       Logger::log("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
                }
 
                // Do we already have this content?
-               $item_activity = DBA::selectFirst('item-activity', ['id'], ['uri-hash' => $item['uri-hash']]);
+               $item_activity = DBA::selectFirst('item-activity', ['id'], ['uri-id' => $item['uri-id']]);
                if (DBA::isResult($item_activity)) {
                        $item['iaid'] = $item_activity['id'];
-                       logger('Fetched activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
+                       Logger::log('Fetched activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
                } elseif (DBA::insert('item-activity', $fields)) {
                        $item['iaid'] = DBA::lastInsertId();
-                       logger('Inserted activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
+                       Logger::log('Inserted activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
                } else {
                        // This shouldn't happen.
-                       logger('Could not insert activity for URI ' . $item['uri'] . ' - should not happen');
+                       Logger::log('Could not insert activity for URI ' . $item['uri'] . ' - should not happen');
+                       Lock::release('item_insert_activity');
                        return false;
                }
                if ($locked) {
@@ -1917,10 +1908,11 @@ class Item extends BaseObject
         * @brief Insert a new item content entry
         *
         * @param array $item The item fields that are to be inserted
+        * @throws \Exception
         */
        private static function insertContent(&$item)
        {
-               $fields = ['uri' => $item['uri'], 'uri-plink-hash' => $item['uri-hash']];
+               $fields = ['uri-plink-hash' => (string)$item['uri-id'], 'uri-id' => $item['uri-id']];
 
                foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
                        if (isset($item[$field])) {
@@ -1932,20 +1924,20 @@ class Item extends BaseObject
                // To avoid timing problems, we are using locks.
                $locked = Lock::acquire('item_insert_content');
                if (!$locked) {
-                       logger("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
+                       Logger::log("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
                }
 
                // Do we already have this content?
-               $item_content = DBA::selectFirst('item-content', ['id'], ['uri-plink-hash' => $item['uri-hash']]);
+               $item_content = DBA::selectFirst('item-content', ['id'], ['uri-id' => $item['uri-id']]);
                if (DBA::isResult($item_content)) {
                        $item['icid'] = $item_content['id'];
-                       logger('Fetched content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
+                       Logger::log('Fetched content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
                } elseif (DBA::insert('item-content', $fields)) {
                        $item['icid'] = DBA::lastInsertId();
-                       logger('Inserted content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
+                       Logger::log('Inserted content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
                } else {
                        // This shouldn't happen.
-                       logger('Could not insert content for URI ' . $item['uri'] . ' - should not happen');
+                       Logger::log('Could not insert content for URI ' . $item['uri'] . ' - should not happen');
                }
                if ($locked) {
                        Lock::release('item_insert_content');
@@ -1955,8 +1947,10 @@ class Item extends BaseObject
        /**
         * @brief Update existing item content entries
         *
-        * @param array $item The item fields that are to be changed
+        * @param array $item      The item fields that are to be changed
         * @param array $condition The condition for finding the item content entries
+        * @return bool
+        * @throws \Exception
         */
        private static function updateActivity($item, $condition)
        {
@@ -1971,7 +1965,7 @@ class Item extends BaseObject
 
                $fields = ['activity' => $activity_index];
 
-               logger('Update activity for ' . json_encode($condition));
+               Logger::log('Update activity for ' . json_encode($condition));
 
                DBA::update('item-activity', $fields, $condition, true);
 
@@ -1981,8 +1975,9 @@ class Item extends BaseObject
        /**
         * @brief Update existing item content entries
         *
-        * @param array $item The item fields that are to be changed
+        * @param array $item      The item fields that are to be changed
         * @param array $condition The condition for finding the item content entries
+        * @throws \Exception
         */
        private static function updateContent($item, $condition)
        {
@@ -2000,7 +1995,7 @@ class Item extends BaseObject
                        $fields = $condition;
                }
 
-               logger('Update content for ' . json_encode($condition));
+               Logger::log('Update content for ' . json_encode($condition));
 
                DBA::update('item-content', $fields, $condition, true);
        }
@@ -2010,6 +2005,7 @@ class Item extends BaseObject
         *
         * @param integer $itemid      Item ID that should be added
         * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
+        * @throws \Exception
         */
        public static function distribute($itemid, $signed_text = '')
        {
@@ -2021,9 +2017,9 @@ class Item extends BaseObject
 
                // Only distribute public items from native networks
                $condition = ['id' => $itemid, 'uid' => 0,
-                       'network' => [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""],
+                       'network' => [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS, ""],
                        'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => false];
-               $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
+               $item = self::selectFirst(self::ITEM_FIELDLIST, $condition);
                if (!DBA::isResult($item)) {
                        return;
                }
@@ -2039,20 +2035,52 @@ class Item extends BaseObject
 
                $users = [];
 
-               $condition = ["`nurl` IN (SELECT `nurl` FROM `contact` WHERE `id` = ?) AND `uid` != 0 AND NOT `blocked` AND `rel` IN (?, ?)",
-                       $parent['owner-id'], Contact::SHARING,  Contact::FRIEND];
+               /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
+               $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
+               if (!DBA::isResult($owner)) {
+                       return;
+               }
 
+               $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
                $contacts = DBA::select('contact', ['uid'], $condition);
+               while ($contact = DBA::fetch($contacts)) {
+                       if ($contact['uid'] == 0) {
+                               continue;
+                       }
+
+                       $users[$contact['uid']] = $contact['uid'];
+               }
+               DBA::close($contacts);
 
+               $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
+               $contacts = DBA::select('contact', ['uid'], $condition);
                while ($contact = DBA::fetch($contacts)) {
+                       if ($contact['uid'] == 0) {
+                               continue;
+                       }
+
                        $users[$contact['uid']] = $contact['uid'];
                }
+               DBA::close($contacts);
+
+               if (!empty($owner['alias'])) {
+                       $condition = ['url' => $owner['alias'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
+                       $contacts = DBA::select('contact', ['uid'], $condition);
+                       while ($contact = DBA::fetch($contacts)) {
+                               if ($contact['uid'] == 0) {
+                                       continue;
+                               }
+
+                               $users[$contact['uid']] = $contact['uid'];
+                       }
+                       DBA::close($contacts);
+               }
 
                $origin_uid = 0;
 
                if ($item['uri'] != $item['parent-uri']) {
                        $parents = self::select(['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
-                       while ($parent = DBA::fetch($parents)) {
+                       while ($parent = self::fetch($parents)) {
                                $users[$parent['uid']] = $parent['uid'];
                                if ($parent['origin'] && !$origin) {
                                        $origin_uid = $parent['uid'];
@@ -2074,6 +2102,7 @@ class Item extends BaseObject
         * @param integer $itemid Item ID that should be added
         * @param array   $item   The item entry that will be stored
         * @param integer $uid    The user that will receive the item entry
+        * @throws \Exception
         */
        private static function storeForUser($itemid, $item, $uid)
        {
@@ -2107,9 +2136,9 @@ class Item extends BaseObject
                $distributed = self::insert($item, false, $notify, true);
 
                if (!$distributed) {
-                       logger("Distributed public item " . $itemid . " for user " . $uid . " wasn't stored", LOGGER_DEBUG);
+                       Logger::log("Distributed public item " . $itemid . " for user " . $uid . " wasn't stored", Logger::DEBUG);
                } else {
-                       logger("Distributed public item " . $itemid . " for user " . $uid . " with id " . $distributed, LOGGER_DEBUG);
+                       Logger::log("Distributed public item " . $itemid . " for user " . $uid . " with id " . $distributed, Logger::DEBUG);
                }
        }
 
@@ -2121,6 +2150,7 @@ class Item extends BaseObject
         * It is planned that in the future we will store public item entries only once.
         *
         * @param integer $itemid Item ID that should be added
+        * @throws \Exception
         */
        public static function addShadow($itemid)
        {
@@ -2143,7 +2173,7 @@ class Item extends BaseObject
                }
 
                // is it an entry from a connector? Only add an entry for natively connected networks
-               if (!in_array($item["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""])) {
+               if (!in_array($item["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS, ""])) {
                        return;
                }
 
@@ -2172,7 +2202,7 @@ class Item extends BaseObject
 
                        $public_shadow = self::insert($item, false, false, true);
 
-                       logger("Stored public shadow for thread ".$itemid." under id ".$public_shadow, LOGGER_DEBUG);
+                       Logger::log("Stored public shadow for thread ".$itemid." under id ".$public_shadow, Logger::DEBUG);
                }
        }
 
@@ -2182,6 +2212,7 @@ class Item extends BaseObject
         * This function does the same like the function above - but for comments
         *
         * @param integer $itemid Item ID that should be added
+        * @throws \Exception
         */
        public static function addShadowPost($itemid)
        {
@@ -2229,18 +2260,21 @@ class Item extends BaseObject
 
                $public_shadow = self::insert($item, false, false, true);
 
-               logger("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, LOGGER_DEBUG);
+               Logger::log("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, Logger::DEBUG);
 
                // If this was a comment to a Diaspora post we don't get our comment back.
                // This means that we have to distribute the comment by ourselves.
-               if ($origin && self::exists(['id' => $parent, 'network' => NETWORK_DIASPORA])) {
+               if ($origin && self::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
                        self::distribute($public_shadow);
                }
        }
 
-        /**
+       /**
         * Adds a language specification in a "language" element of given $arr.
         * Expects "body" element to exist in $arr.
+        *
+        * @param $item
+        * @throws \Text_LanguageDetect_Exception
         */
        private static function addLanguageToItemArray(&$item)
        {
@@ -2286,24 +2320,19 @@ class Item extends BaseObject
        /**
         * generate an unique URI
         *
-        * @param integer $uid User id
-        * @param string $guid An existing GUID (Otherwise it will be generated)
+        * @param integer $uid  User id
+        * @param string  $guid An existing GUID (Otherwise it will be generated)
         *
         * @return string
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
         */
        public static function newURI($uid, $guid = "")
        {
                if ($guid == "") {
-                       $guid = System::createGUID(32);
+                       $guid = System::createUUID();
                }
 
-               $hostname = self::getApp()->get_hostname();
-
-               $user = DBA::selectFirst('user', ['nickname'], ['uid' => $uid]);
-
-               $uri = "urn:X-dfrn:" . $hostname . ':' . $user['nickname'] . ':' . $guid;
-
-               return $uri;
+               return self::getApp()->getBaseURL() . '/objects/' . $guid;
        }
 
        /**
@@ -2314,6 +2343,7 @@ class Item extends BaseObject
         * Don't set this value if it isn't from the owner (could be an author that we don't know)
         *
         * @param array $arr Contains the just posted item record
+        * @throws \Exception
         */
        private static function updateContact($arr)
        {
@@ -2332,7 +2362,7 @@ class Item extends BaseObject
                $update = (!$arr['private'] && ((defaults($arr, 'author-link', '') === defaults($arr, 'owner-link', '')) || ($arr["parent-uri"] === $arr["uri"])));
 
                // Is it a forum? Then we don't care about the rules from above
-               if (!$update && ($arr["network"] == NETWORK_DFRN) && ($arr["parent-uri"] === $arr["uri"])) {
+               if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri"] === $arr["uri"])) {
                        if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
                                $update = true;
                        }
@@ -2356,14 +2386,24 @@ class Item extends BaseObject
 
        public static function setHashtags(&$item)
        {
-
-               $tags = get_tags($item["body"]);
+               $tags = BBCode::getTags($item["body"]);
 
                // No hashtags?
                if (!count($tags)) {
                        return false;
                }
 
+               // What happens in [code], stays in [code]!
+               // escape the # and the [
+               // hint: we will also get in trouble with #tags, when we want markdown in posts -> ### Headline 3
+               $item["body"] = preg_replace_callback("/\[code(.*?)\](.*?)\[\/code\]/ism",
+                       function ($match) {
+                               // we truly ESCape all # and [ to prevent gettin weird tags in [code] blocks
+                               $find = ['#', '['];
+                               $replace = [chr(27).'sharp', chr(27).'leftsquarebracket'];
+                               return ("[code" . $match[1] . "]" . str_replace($find, $replace, $match[2]) . "[/code]");
+                       }, $item["body"]);
+
                // This sorting is important when there are hashtags that are part of other hashtags
                // Otherwise there could be problems with hashtags like #test and #test2
                rsort($tags);
@@ -2400,26 +2440,35 @@ class Item extends BaseObject
                                "&num;$2", $item["body"]);
 
                foreach ($tags as $tag) {
-                       if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=')) {
+                       if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || $tag[1] == '#') {
                                continue;
                        }
 
                        $basetag = str_replace('_',' ',substr($tag,1));
-
-                       $newtag = '#[url=' . System::baseUrl() . '/search?tag=' . rawurlencode($basetag) . ']' . $basetag . '[/url]';
+                       $newtag = '#[url=' . System::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
 
                        $item["body"] = str_replace($tag, $newtag, $item["body"]);
 
                        if (!stristr($item["tag"], "/search?tag=" . $basetag . "]" . $basetag . "[/url]")) {
                                if (strlen($item["tag"])) {
-                                       $item["tag"] = ','.$item["tag"];
+                                       $item["tag"] = ',' . $item["tag"];
                                }
-                               $item["tag"] = $newtag.$item["tag"];
+                               $item["tag"] = $newtag . $item["tag"];
                        }
                }
 
                // Convert back the masked hashtags
                $item["body"] = str_replace("&num;", "#", $item["body"]);
+
+               // Remember! What happens in [code], stays in [code]
+               // roleback the # and [
+               $item["body"] = preg_replace_callback("/\[code(.*?)\](.*?)\[\/code\]/ism",
+                       function ($match) {
+                               // we truly unESCape all sharp and leftsquarebracket
+                               $find = [chr(27).'sharp', chr(27).'leftsquarebracket'];
+                               $replace = ['#', '['];
+                               return ("[code" . $match[1] . "]" . str_replace($find, $replace, $match[2]) . "[/code]");
+                       }, $item["body"]);
        }
 
        public static function getGuidById($id)
@@ -2432,37 +2481,47 @@ class Item extends BaseObject
                }
        }
 
+       /**
+        * This function is only used for the old Friendica app on Android that doesn't like paths with guid
+        *
+        * @param string $guid item guid
+        * @param int    $uid  user id
+        * @return array with id and nick of the item with the given guid
+        * @throws \Exception
+        */
        public static function getIdAndNickByGuid($guid, $uid = 0)
        {
                $nick = "";
                $id = 0;
 
                if ($uid == 0) {
-                       $uid == local_user();
+                       $uid = local_user();
                }
 
                // Does the given user have this item?
                if ($uid) {
-                       $item = DBA::fetchFirst("SELECT `item`.`id`, `user`.`nickname` FROM `item`
-                               INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
-                               WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
-                                       AND `item`.`guid` = ? AND `item`.`uid` = ?", $guid, $uid);
+                       $item = self::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
                        if (DBA::isResult($item)) {
-                               $id = $item["id"];
-                               $nick = $item["nickname"];
+                               $user = DBA::selectFirst('user', ['nickname'], ['uid' => $uid]);
+                               if (!DBA::isResult($user)) {
+                                       return;
+                               }
+                               $id = $item['id'];
+                               $nick = $user['nickname'];
                        }
                }
 
                // Or is it anywhere on the server?
                if ($nick == "") {
-                       $item = DBA::fetchFirst("SELECT `item`.`id`, `user`.`nickname` FROM `item`
-                               INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
-                               WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
-                                       AND NOT `item`.`private` AND `item`.`wall`
-                                       AND `item`.`guid` = ?", $guid);
+                       $condition = ["`guid` = ? AND `uid` != 0", $guid];
+                       $item = self::selectFirst(['id', 'uid'], $condition);
                        if (DBA::isResult($item)) {
-                               $id = $item["id"];
-                               $nick = $item["nickname"];
+                               $user = DBA::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
+                               if (!DBA::isResult($user)) {
+                                       return;
+                               }
+                               $id = $item['id'];
+                               $nick = $user['nickname'];
                        }
                }
                return ["nick" => $nick, "id" => $id];
@@ -2470,9 +2529,12 @@ class Item extends BaseObject
 
        /**
         * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
+        *
         * @param int $uid
         * @param int $item_id
-        * @return bool true if item was deleted, else false
+        * @return void true if item was deleted, else false
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @throws \ImagickException
         */
        private static function tagDeliver($uid, $item_id)
        {
@@ -2483,28 +2545,28 @@ class Item extends BaseObject
                        return;
                }
 
-               $community_page = (($user['page-flags'] == Contact::PAGE_COMMUNITY) ? true : false);
-               $prvgroup = (($user['page-flags'] == Contact::PAGE_PRVGROUP) ? true : false);
+               $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
+               $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
 
                $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
                if (!DBA::isResult($item)) {
                        return;
                }
 
-               $link = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
+               $link = Strings::normaliseLink(System::baseUrl() . '/profile/' . $user['nickname']);
 
                /*
                 * Diaspora uses their own hardwired link URL in @-tags
                 * instead of the one we supply with webfinger
                 */
-               $dlink = normalise_link(System::baseUrl() . '/u/' . $user['nickname']);
+               $dlink = Strings::normaliseLink(System::baseUrl() . '/u/' . $user['nickname']);
 
                $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
                if ($cnt) {
                        foreach ($matches as $mtch) {
-                               if (link_compare($link, $mtch[1]) || link_compare($dlink, $mtch[1])) {
+                               if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
                                        $mention = true;
-                                       logger('mention found: ' . $mtch[2]);
+                                       Logger::log('mention found: ' . $mtch[2]);
                                }
                        }
                }
@@ -2514,7 +2576,7 @@ class Item extends BaseObject
                                  !$item['wall'] && !$item['origin'] && ($item['id'] == $item['parent'])) {
                                // mmh.. no mention.. community page or private group... no wall.. no origin.. top-post (not a comment)
                                // delete it!
-                               logger("no-mention top-level post to community or private group. delete.");
+                               Logger::log("no-mention top-level post to community or private group. delete.");
                                DBA::delete('item', ['id' => $item_id]);
                                return true;
                        }
@@ -2523,7 +2585,7 @@ class Item extends BaseObject
 
                $arr = ['item' => $item, 'user' => $user];
 
-               Addon::callHooks('tagged', $arr);
+               Hook::callAll('tagged', $arr);
 
                if (!$community_page && !$prvgroup) {
                        return;
@@ -2550,12 +2612,13 @@ class Item extends BaseObject
 
                $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? 1 : 0;
 
+               $psid = PermissionSet::fetchIDForPost($user);
+
                $forum_mode = ($prvgroup ? 2 : 1);
 
                $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
-                       'owner-id' => $owner_id, 'owner-link' => $self['url'], 'private' => $private, 'allow_cid' => $user['allow_cid'],
-                       'allow_gid' => $user['allow_gid'], 'deny_cid' => $user['deny_cid'], 'deny_gid' => $user['deny_gid']];
-               DBA::update('item', $fields, ['id' => $item_id]);
+                       'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
+               self::update($fields, ['id' => $item_id]);
 
                self::updateThread($item_id);
 
@@ -2564,37 +2627,37 @@ class Item extends BaseObject
 
        public static function isRemoteSelf($contact, &$datarray)
        {
-               $a = get_app();
+               $a = \get_app();
 
                if (!$contact['remote_self']) {
                        return false;
                }
 
                // Prevent the forwarding of posts that are forwarded
-               if (!empty($datarray["extid"]) && ($datarray["extid"] == NETWORK_DFRN)) {
-                       logger('Already forwarded', LOGGER_DEBUG);
+               if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
+                       Logger::log('Already forwarded', Logger::DEBUG);
                        return false;
                }
 
                // Prevent to forward already forwarded posts
-               if ($datarray["app"] == $a->get_hostname()) {
-                       logger('Already forwarded (second test)', LOGGER_DEBUG);
+               if ($datarray["app"] == $a->getHostName()) {
+                       Logger::log('Already forwarded (second test)', Logger::DEBUG);
                        return false;
                }
 
                // Only forward posts
                if ($datarray["verb"] != ACTIVITY_POST) {
-                       logger('No post', LOGGER_DEBUG);
+                       Logger::log('No post', Logger::DEBUG);
                        return false;
                }
 
-               if (($contact['network'] != NETWORK_FEED) && $datarray['private']) {
-                       logger('Not public', LOGGER_DEBUG);
+               if (($contact['network'] != Protocol::FEED) && $datarray['private']) {
+                       Logger::log('Not public', Logger::DEBUG);
                        return false;
                }
 
                $datarray2 = $datarray;
-               logger('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), LOGGER_DEBUG);
+               Logger::log('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), Logger::DEBUG);
                if ($contact['remote_self'] == 2) {
                        $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
                                        ['uid' => $contact['uid'], 'self' => true]);
@@ -2617,13 +2680,13 @@ class Item extends BaseObject
                                unset($datarray['author-id']);
                        }
 
-                       if ($contact['network'] != NETWORK_FEED) {
-                               $datarray["guid"] = System::createGUID(32);
+                       if ($contact['network'] != Protocol::FEED) {
+                               $datarray["guid"] = System::createUUID();
                                unset($datarray["plink"]);
                                $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
                                $datarray["parent-uri"] = $datarray["uri"];
                                $datarray["thr-parent"] = $datarray["uri"];
-                               $datarray["extid"] = NETWORK_DFRN;
+                               $datarray["extid"] = Protocol::DFRN;
                                $urlpart = parse_url($datarray2['author-link']);
                                $datarray["app"] = $urlpart["host"];
                        } else {
@@ -2631,10 +2694,10 @@ class Item extends BaseObject
                        }
                }
 
-               if ($contact['network'] != NETWORK_FEED) {
+               if ($contact['network'] != Protocol::FEED) {
                        // Store the original post
                        $result = self::insert($datarray2, false, false);
-                       logger('remote-self post original item - Contact '.$contact['url'].' return '.$result.' Item '.print_r($datarray2, true), LOGGER_DEBUG);
+                       Logger::log('remote-self post original item - Contact '.$contact['url'].' return '.$result.' Item '.print_r($datarray2, true), Logger::DEBUG);
                } else {
                        $datarray["app"] = "Feed";
                        $result = true;
@@ -2657,6 +2720,8 @@ class Item extends BaseObject
         * @param array  $item
         * @param int    $cid
         * @return string
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @throws \ImagickException
         */
        public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
        {
@@ -2664,7 +2729,7 @@ class Item extends BaseObject
                        return $s;
                }
 
-               logger('check for photos', LOGGER_DEBUG);
+               Logger::log('check for photos', Logger::DEBUG);
                $site = substr(System::baseUrl(), strpos(System::baseUrl(), '://'));
 
                $orig_body = $s;
@@ -2678,7 +2743,7 @@ class Item extends BaseObject
                        $img_st_close++; // make it point to AFTER the closing bracket
                        $image = substr($orig_body, $img_start + $img_st_close, $img_len);
 
-                       logger('found photo ' . $image, LOGGER_DEBUG);
+                       Logger::log('found photo ' . $image, Logger::DEBUG);
 
                        if (stristr($image, $site . '/photo/')) {
                                // Only embed locally hosted photos
@@ -2690,8 +2755,7 @@ class Item extends BaseObject
                                if ($x) {
                                        $res = substr($i, $x + 1);
                                        $i = substr($i, 0, $x);
-                                       $fields = ['data', 'type', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
-                                       $photo = DBA::selectFirst('photo', $fields, ['resource-id' => $i, 'scale' => $res, 'uid' => $uid]);
+                                       $photo = Photo::getPhotoForUser($uid, $i, $res);
                                        if (DBA::isResult($photo)) {
                                                /*
                                                 * Check to see if we should replace this photo link with an embedded image
@@ -2715,27 +2779,23 @@ class Item extends BaseObject
                                                        }
                                                }
                                                if ($replace) {
-                                                       $data = $photo['data'];
-                                                       $type = $photo['type'];
-
+                                                       $photo_img = Photo::getImageForPhoto($photo);
                                                        // If a custom width and height were specified, apply before embedding
                                                        if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
-                                                               logger('scaling photo', LOGGER_DEBUG);
+                                                               Logger::log('scaling photo', Logger::DEBUG);
 
                                                                $width = intval($match[1]);
                                                                $height = intval($match[2]);
 
-                                                               $Image = new Image($data, $type);
-                                                               if ($Image->isValid()) {
-                                                                       $Image->scaleDown(max($width, $height));
-                                                                       $data = $Image->asString();
-                                                                       $type = $Image->getType();
-                                                               }
+                                                               $photo_img->scaleDown(max($width, $height));
                                                        }
 
-                                                       logger('replacing photo', LOGGER_DEBUG);
+                                                       $data = $photo_img->asString();
+                                                       $type = $photo_img->getType();
+
+                                                       Logger::log('replacing photo', Logger::DEBUG);
                                                        $image = 'data:' . $type . ';base64,' . base64_encode($data);
-                                                       logger('replaced: ' . $image, LOGGER_DATA);
+                                                       Logger::log('replaced: ' . $image, Logger::DATA);
                                                }
                                        }
                                }
@@ -2784,7 +2844,7 @@ class Item extends BaseObject
        }
 
        // returns an array of contact-ids that are allowed to see this object
-       private static function enumeratePermissions($obj)
+       public static function enumeratePermissions($obj)
        {
                $allow_people = expand_acl($obj['allow_cid']);
                $allow_groups = Group::expand(expand_acl($obj['allow_gid']));
@@ -2898,7 +2958,7 @@ class Item extends BaseObject
                        ++$expired;
                }
                DBA::close($items);
-               logger('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
+               Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
        }
 
        public static function firstPostDate($uid, $wall = false)
@@ -2919,12 +2979,15 @@ class Item extends BaseObject
         *
         * @param string $item_id
         * @param string $verb
-        *              Activity verb. One of
-        *                      like, unlike, dislike, undislike, attendyes, unattendyes,
-        *                      attendno, unattendno, attendmaybe, unattendmaybe
-        * @hook 'post_local_end'
-        *              array $arr
-        *                      'post_id' => ID of posted item
+        *            Activity verb. One of
+        *            like, unlike, dislike, undislike, attendyes, unattendyes,
+        *            attendno, unattendno, attendmaybe, unattendmaybe
+        * @return bool
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @throws \ImagickException
+        * @hook  'post_local_end'
+        *            array $arr
+        *            'post_id' => ID of posted item
         */
        public static function performLike($item_id, $verb)
        {
@@ -2954,18 +3017,18 @@ class Item extends BaseObject
                                $activity = ACTIVITY_ATTENDMAYBE;
                                break;
                        default:
-                               logger('like: unknown verb ' . $verb . ' for item ' . $item_id);
+                               Logger::log('like: unknown verb ' . $verb . ' for item ' . $item_id);
                                return false;
                }
 
                // Enable activity toggling instead of on/off
                $event_verb_flag = $activity === ACTIVITY_ATTEND || $activity === ACTIVITY_ATTENDNO || $activity === ACTIVITY_ATTENDMAYBE;
 
-               logger('like: verb ' . $verb . ' item ' . $item_id);
+               Logger::log('like: verb ' . $verb . ' item ' . $item_id);
 
                $item = self::selectFirst(self::ITEM_FIELDLIST, ['`id` = ? OR `uri` = ?', $item_id, $item_id]);
                if (!DBA::isResult($item)) {
-                       logger('like: unknown item ' . $item_id);
+                       Logger::log('like: unknown item ' . $item_id);
                        return false;
                }
 
@@ -2976,15 +3039,15 @@ class Item extends BaseObject
                        $uid = local_user();
                }
 
-               if (!can_write_wall($uid)) {
-                       logger('like: unable to write on wall ' . $uid);
+               if (!Security::canWriteToUserWall($uid)) {
+                       Logger::log('like: unable to write on wall ' . $uid);
                        return false;
                }
 
                // Retrieves the local post owner
                $owner_self_contact = DBA::selectFirst('contact', [], ['uid' => $uid, 'self' => true]);
                if (!DBA::isResult($owner_self_contact)) {
-                       logger('like: unknown owner ' . $uid);
+                       Logger::log('like: unknown owner ' . $uid);
                        return false;
                }
 
@@ -2993,19 +3056,18 @@ class Item extends BaseObject
 
                $author_contact = DBA::selectFirst('contact', ['url'], ['id' => $author_id]);
                if (!DBA::isResult($author_contact)) {
-                       logger('like: unknown author ' . $author_id);
+                       Logger::log('like: unknown author ' . $author_id);
                        return false;
                }
 
                // Contact-id is the uid-dependant author contact
                if (local_user() == $uid) {
                        $item_contact_id = $owner_self_contact['id'];
-                       $item_contact = $owner_self_contact;
                } else {
                        $item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, true);
                        $item_contact = DBA::selectFirst('contact', [], ['id' => $item_contact_id]);
                        if (!DBA::isResult($item_contact)) {
-                               logger('like: unknown item contact ' . $item_contact_id);
+                               Logger::log('like: unknown item contact ' . $item_contact_id);
                                return false;
                        }
                }
@@ -3044,21 +3106,21 @@ class Item extends BaseObject
                        return true;
                }
 
-               $objtype = $item['resource-id'] ? ACTIVITY_OBJ_IMAGE : ACTIVITY_OBJ_NOTE ;
+               $objtype = $item['resource-id'] ? ACTIVITY_OBJ_IMAGE : ACTIVITY_OBJ_NOTE;
 
                $new_item = [
-                       'guid'          => System::createGUID(32),
+                       'guid'          => System::createUUID(),
                        'uri'           => self::newURI($item['uid']),
                        'uid'           => $item['uid'],
                        'contact-id'    => $item_contact_id,
                        'wall'          => $item['wall'],
                        'origin'        => 1,
-                       'network'       => NETWORK_DFRN,
+                       'network'       => Protocol::DFRN,
                        'gravity'       => GRAVITY_ACTIVITY,
                        'parent'        => $item['id'],
                        'parent-uri'    => $item['uri'],
                        'thr-parent'    => $item['uri'],
-                       'owner-id'      => $item['owner-id'],
+                       'owner-id'      => $author_id,
                        'author-id'     => $author_id,
                        'body'          => $activity,
                        'verb'          => $activity,
@@ -3071,6 +3133,11 @@ class Item extends BaseObject
                        'unseen'        => 1,
                ];
 
+               $signed = Diaspora::createLikeSignature($uid, $new_item);
+               if (!empty($signed)) {
+                       $new_item['diaspora_signed_text'] = json_encode($signed);
+               }
+
                $new_item_id = self::insert($new_item);
 
                // If the parent item isn't visible then set it to visible
@@ -3078,14 +3145,9 @@ class Item extends BaseObject
                        self::update(['visible' => true], ['id' => $item['id']]);
                }
 
-               // Save the author information for the like in case we need to relay to Diaspora
-               Diaspora::storeLikeSignature($item_contact, $new_item_id);
-
                $new_item['id'] = $new_item_id;
 
-               Addon::callHooks('post_local_end', $new_item);
-
-               Worker::add(PRIORITY_HIGH, "Notifier", "like", $new_item_id);
+               Hook::callAll('post_local_end', $new_item);
 
                return true;
        }
@@ -3107,7 +3169,7 @@ class Item extends BaseObject
                if (!$onlyshadow) {
                        $result = DBA::insert('thread', $item);
 
-                       logger("Add thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
+                       Logger::log("Add thread for item ".$itemid." - ".print_r($result, true), Logger::DEBUG);
                }
        }
 
@@ -3127,8 +3189,6 @@ class Item extends BaseObject
                        $item["mention"] = 1;
                }
 
-               $sql = "";
-
                $fields = [];
 
                foreach ($item as $field => $data) {
@@ -3139,28 +3199,360 @@ class Item extends BaseObject
 
                $result = DBA::update('thread', $fields, ['iid' => $itemid]);
 
-               logger("Update thread for item ".$itemid." - guid ".$item["guid"]." - ".(int)$result, LOGGER_DEBUG);
+               Logger::log("Update thread for item ".$itemid." - guid ".$item["guid"]." - ".(int)$result, Logger::DEBUG);
        }
 
        private static function deleteThread($itemid, $itemuri = "")
        {
                $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
                if (!DBA::isResult($item)) {
-                       logger('No thread found for id '.$itemid, LOGGER_DEBUG);
+                       Logger::log('No thread found for id '.$itemid, Logger::DEBUG);
                        return;
                }
 
-               // Using dba::delete at this time could delete the associated item entries
-               $result = DBA::e("DELETE FROM `thread` WHERE `iid` = ?", $itemid);
+               $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
 
-               logger("deleteThread: Deleted thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
+               Logger::log("deleteThread: Deleted thread for item ".$itemid." - ".print_r($result, true), Logger::DEBUG);
 
                if ($itemuri != "") {
                        $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
                        if (!self::exists($condition)) {
                                DBA::delete('item', ['uri' => $itemuri, 'uid' => 0]);
-                               logger("deleteThread: Deleted shadow for item ".$itemuri, LOGGER_DEBUG);
+                               Logger::log("deleteThread: Deleted shadow for item ".$itemuri, Logger::DEBUG);
+                       }
+               }
+       }
+
+       public static function getPermissionsSQLByUserId($owner_id, $remote_verified = false, $groups = null, $remote_cid = null)
+       {
+               $local_user = local_user();
+               $remote_user = remote_user();
+
+               /*
+                * Construct permissions
+                *
+                * default permissions - anonymous user
+                */
+               $sql = " AND NOT `item`.`private`";
+
+               // Profile owner - everything is visible
+               if ($local_user && ($local_user == $owner_id)) {
+                       $sql = '';
+               } elseif ($remote_user) {
+                       /*
+                        * Authenticated visitor. Unless pre-verified,
+                        * check that the contact belongs to this $owner_id
+                        * and load the groups the visitor belongs to.
+                        * If pre-verified, the caller is expected to have already
+                        * done this and passed the groups into this function.
+                        */
+                       $set = PermissionSet::get($owner_id, $remote_cid, $groups);
+
+                       if (!empty($set)) {
+                               $sql_set = " OR (`item`.`private` IN (1,2) AND `item`.`wall` AND `item`.`psid` IN (" . implode(',', $set) . "))";
+                       } else {
+                               $sql_set = '';
+                       }
+
+                       $sql = " AND (NOT `item`.`private`" . $sql_set . ")";
+               }
+
+               return $sql;
+       }
+
+       /**
+        * get translated item type
+        *
+        * @param $item
+        * @return string
+        */
+       public static function postType($item)
+       {
+               if (!empty($item['event-id'])) {
+                       return L10n::t('event');
+               } elseif (!empty($item['resource-id'])) {
+                       return L10n::t('photo');
+               } elseif (!empty($item['verb']) && $item['verb'] !== ACTIVITY_POST) {
+                       return L10n::t('activity');
+               } elseif ($item['id'] != $item['parent']) {
+                       return L10n::t('comment');
+               }
+
+               return L10n::t('post');
+       }
+
+       /**
+        * Sets the "rendered-html" field of the provided item
+        *
+        * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
+        *
+        * @param array $item
+        * @param bool  $update
+        *
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
+        */
+       public static function putInCache(&$item, $update = false)
+       {
+               $body = $item["body"];
+
+               $rendered_hash = defaults($item, 'rendered-hash', '');
+               $rendered_html = defaults($item, 'rendered-html', '');
+
+               if ($rendered_hash == ''
+                       || $rendered_html == ""
+                       || $rendered_hash != hash("md5", $item["body"])
+                       || Config::get("system", "ignore_cache")
+               ) {
+                       $a = self::getApp();
+                       redir_private_images($a, $item);
+
+                       $item["rendered-html"] = prepare_text($item["body"]);
+                       $item["rendered-hash"] = hash("md5", $item["body"]);
+
+                       $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
+                       Hook::callAll('put_item_in_cache', $hook_data);
+                       $item['rendered-html'] = $hook_data['rendered-html'];
+                       $item['rendered-hash'] = $hook_data['rendered-hash'];
+                       unset($hook_data);
+
+                       // Force an update if the generated values differ from the existing ones
+                       if ($rendered_hash != $item["rendered-hash"]) {
+                               $update = true;
+                       }
+
+                       // Only compare the HTML when we forcefully ignore the cache
+                       if (Config::get("system", "ignore_cache") && ($rendered_html != $item["rendered-html"])) {
+                               $update = true;
                        }
+
+                       if ($update && !empty($item["id"])) {
+                               self::update(
+                                       [
+                                               'rendered-html' => $item["rendered-html"],
+                                               'rendered-hash' => $item["rendered-hash"]
+                                       ],
+                                       ['id' => $item["id"]]
+                               );
+                       }
+               }
+
+               $item["body"] = $body;
+       }
+
+       /**
+        * @brief Given an item array, convert the body element from bbcode to html and add smilie icons.
+        * If attach is true, also add icons for item attachments.
+        *
+        * @param array   $item
+        * @param boolean $attach
+        * @param boolean $is_preview
+        * @return string item body html
+        * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+        * @throws \ImagickException
+        * @hook  prepare_body_init item array before any work
+        * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
+        * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
+        * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
+        */
+       public static function prepareBody(array &$item, $attach = false, $is_preview = false)
+       {
+               $a = self::getApp();
+               Hook::callAll('prepare_body_init', $item);
+
+               // In order to provide theme developers more possibilities, event items
+               // are treated differently.
+               if ($item['object-type'] === ACTIVITY_OBJ_EVENT && isset($item['event-id'])) {
+                       $ev = Event::getItemHTML($item);
+                       return $ev;
+               }
+
+               $tags = Term::populateTagsFromItem($item);
+
+               $item['tags'] = $tags['tags'];
+               $item['hashtags'] = $tags['hashtags'];
+               $item['mentions'] = $tags['mentions'];
+
+               // Compile eventual content filter reasons
+               $filter_reasons = [];
+               if (!$is_preview && public_contact() != $item['author-id']) {
+                       if (!empty($item['content-warning']) && (!local_user() || !PConfig::get(local_user(), 'system', 'disable_cw', false))) {
+                               $filter_reasons[] = L10n::t('Content warning: %s', $item['content-warning']);
+                       }
+
+                       $hook_data = [
+                               'item' => $item,
+                               'filter_reasons' => $filter_reasons
+                       ];
+                       Hook::callAll('prepare_body_content_filter', $hook_data);
+                       $filter_reasons = $hook_data['filter_reasons'];
+                       unset($hook_data);
                }
+
+               // Update the cached values if there is no "zrl=..." on the links.
+               $update = (!local_user() && !remote_user() && ($item["uid"] == 0));
+
+               // Or update it if the current viewer is the intented viewer.
+               if (($item["uid"] == local_user()) && ($item["uid"] != 0)) {
+                       $update = true;
+               }
+
+               self::putInCache($item, $update);
+               $s = $item["rendered-html"];
+
+               $hook_data = [
+                       'item' => $item,
+                       'html' => $s,
+                       'preview' => $is_preview,
+                       'filter_reasons' => $filter_reasons
+               ];
+               Hook::callAll('prepare_body', $hook_data);
+               $s = $hook_data['html'];
+               unset($hook_data);
+
+               if (!$attach) {
+                       // Replace the blockquotes with quotes that are used in mails.
+                       $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
+                       $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
+                       return $s;
+               }
+
+               $as = '';
+               $vhead = false;
+               $matches = [];
+               preg_match_all('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\"(?: title=\"(.*?)\")?|', $item['attach'], $matches, PREG_SET_ORDER);
+               foreach ($matches as $mtch) {
+                       $mime = $mtch[3];
+
+                       $the_url = Contact::magicLinkById($item['author-id'], $mtch[1]);
+
+                       if (strpos($mime, 'video') !== false) {
+                               if (!$vhead) {
+                                       $vhead = true;
+                                       $a->page['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('videos_head.tpl'), [
+                                               '$baseurl' => System::baseUrl(),
+                                       ]);
+                               }
+
+                               $url_parts = explode('/', $the_url);
+                               $id = end($url_parts);
+                               $as .= Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
+                                       '$video' => [
+                                               'id'     => $id,
+                                               'title'  => L10n::t('View Video'),
+                                               'src'    => $the_url,
+                                               'mime'   => $mime,
+                                       ],
+                               ]);
+                       }
+
+                       $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
+                       if ($filetype) {
+                               $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
+                               $filesubtype = str_replace('.', '-', $filesubtype);
+                       } else {
+                               $filetype = 'unkn';
+                               $filesubtype = 'unkn';
+                       }
+
+                       $title = Strings::escapeHtml(trim(defaults($mtch, 4, $mtch[1])));
+                       $title .= ' ' . $mtch[2] . ' ' . L10n::t('bytes');
+
+                       $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
+                       $as .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" >' . $icon . '</a>';
+               }
+
+               if ($as != '') {
+                       $s .= '<div class="body-attach">'.$as.'<div class="clear"></div></div>';
+               }
+
+               // Map.
+               if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
+                       $x = Map::byCoordinates(trim($item['coord']));
+                       if ($x) {
+                               $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
+                       }
+               }
+
+
+               // Look for spoiler.
+               $spoilersearch = '<blockquote class="spoiler">';
+
+               // Remove line breaks before the spoiler.
+               while ((strpos($s, "\n" . $spoilersearch) !== false)) {
+                       $s = str_replace("\n" . $spoilersearch, $spoilersearch, $s);
+               }
+               while ((strpos($s, "<br />" . $spoilersearch) !== false)) {
+                       $s = str_replace("<br />" . $spoilersearch, $spoilersearch, $s);
+               }
+
+               while ((strpos($s, $spoilersearch) !== false)) {
+                       $pos = strpos($s, $spoilersearch);
+                       $rnd = Strings::getRandomHex(8);
+                       $spoilerreplace = '<br /> <span id="spoiler-wrap-' . $rnd . '" class="spoiler-wrap fakelink" onclick="openClose(\'spoiler-' . $rnd . '\');">' . L10n::t('Click to open/close') . '</span>'.
+                                               '<blockquote class="spoiler" id="spoiler-' . $rnd . '" style="display: none;">';
+                       $s = substr($s, 0, $pos) . $spoilerreplace . substr($s, $pos + strlen($spoilersearch));
+               }
+
+               // Look for quote with author.
+               $authorsearch = '<blockquote class="author">';
+
+               while ((strpos($s, $authorsearch) !== false)) {
+                       $pos = strpos($s, $authorsearch);
+                       $rnd = Strings::getRandomHex(8);
+                       $authorreplace = '<br /> <span id="author-wrap-' . $rnd . '" class="author-wrap fakelink" onclick="openClose(\'author-' . $rnd . '\');">' . L10n::t('Click to open/close') . '</span>'.
+                                               '<blockquote class="author" id="author-' . $rnd . '" style="display: block;">';
+                       $s = substr($s, 0, $pos) . $authorreplace . substr($s, $pos + strlen($authorsearch));
+               }
+
+               // Replace friendica image url size with theme preference.
+               if (!empty($a->theme_info['item_image_size'])) {
+                       $ps = $a->theme_info['item_image_size'];
+                       $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
+               }
+
+               $s = HTML::applyContentFilter($s, $filter_reasons);
+
+               $hook_data = ['item' => $item, 'html' => $s];
+               Hook::callAll('prepare_body_final', $hook_data);
+
+               return $hook_data['html'];
+       }
+
+       /**
+        * get private link for item
+        *
+        * @param array $item
+        * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
+        * @throws \Exception
+        */
+       public static function getPlink($item)
+       {
+               $a = self::getApp();
+
+               if ($a->user['nickname'] != "") {
+                       $ret = [
+                               'href' => "display/" . $item['guid'],
+                               'orig' => "display/" . $item['guid'],
+                               'title' => L10n::t('View on separate page'),
+                               'orig_title' => L10n::t('view on separate page'),
+                       ];
+
+                       if (!empty($item['plink'])) {
+                               $ret["href"] = $a->removeBaseURL($item['plink']);
+                               $ret["title"] = L10n::t('link to source');
+                       }
+
+               } elseif (!empty($item['plink']) && ($item['private'] != 1)) {
+                       $ret = [
+                               'href' => $item['plink'],
+                               'orig' => $item['plink'],
+                               'title' => L10n::t('link to source'),
+                       ];
+               } else {
+                       $ret = [];
+               }
+
+               return $ret;
        }
 }