diff --git a/doc/Addons.md b/doc/Addons.md
index 91765ec484..b43a8a915d 100644
--- a/doc/Addons.md
+++ b/doc/Addons.md
@@ -281,7 +281,7 @@ $data = [
 	'submit' => [
 		'catavatar-usecat'   => DI::l10n()->t('Use Cat as Avatar'),
 		'catavatar-morecat'  => DI::l10n()->t('Another random Cat!'),
-		'catavatar-emailcat' => DI::pConfig()->get(local_user(), 'catavatar', 'seed', false) ? DI::l10n()->t('Reset to email Cat') : null,
+		'catavatar-emailcat' => DI::pConfig()->get(Session::getLocalUser(), 'catavatar', 'seed', false) ? DI::l10n()->t('Reset to email Cat') : null,
 	],
 ];
 ```
diff --git a/doc/Developer-Domain-Driven-Design.md b/doc/Developer-Domain-Driven-Design.md
index 1e77dd2f0b..a4af436884 100644
--- a/doc/Developer-Domain-Driven-Design.md
+++ b/doc/Developer-Domain-Driven-Design.md
@@ -30,7 +30,7 @@ function doSomething(array $intros)
     }
 }
 
-$intros = \Friendica\Database\DBA::selectToArray('intros', [], ['uid' => local_user()]);
+$intros = \Friendica\Database\DBA::selectToArray('intros', [], ['uid' => Session::getLocalUser()]);
 
 doSomething($intros);
 ```
@@ -47,7 +47,7 @@ function doSomething(\Friendica\Contact\Introductions\Collection\Introductions $
 }
 
 /** @var $intros \Friendica\Contact\Introductions\Collection\Introductions */
-$intros = \Friendica\DI::intro()->selecForUser(local_user());
+$intros = \Friendica\DI::intro()->selecForUser(Session::getLocalUser());
 
 doSomething($intros);
 ```
diff --git a/doc/themes.md b/doc/themes.md
index 7abd787e6c..e578d7f743 100644
--- a/doc/themes.md
+++ b/doc/themes.md
@@ -123,13 +123,13 @@ The selected 1st part will be saved in the database by the theme_post function.
 
     function theme_post(App $a){
         // non local users shall not pass
-        if (! local_user()) {
+        if (! Session::getLocalUser()) {
             return;
         }
         // if the one specific submit button was pressed then proceed
         if (isset($_POST['duepuntozero-settings-submit'])){
             // and save the selection key into the personal config of the user
-            DI::pConfig()->set(local_user(), 'duepuntozero', 'colorset', $_POST['duepuntozero_colorset']);
+            DI::pConfig()->set(Session::getLocalUser(), 'duepuntozero', 'colorset', $_POST['duepuntozero_colorset']);
         }
     }
 
@@ -137,7 +137,7 @@ Now that this information is set in the database, what should friendica do with
 For this, have a look at the theme.php file of the *duepunto zero*.
 There you'll find somethink alike
 
-        $colorset = DI::pConfig()->get( local_user(), 'duepuntozero','colorset');
+        $colorset = DI::pConfig()->get( Session::getLocalUser(), 'duepuntozero','colorset');
         if (!$colorset)
             $colorset = DI::config()->get('duepuntozero', 'colorset');
         if ($colorset) {
diff --git a/src/Navigation/Notifications/Factory/FormattedNavNotification.php b/src/Navigation/Notifications/Factory/FormattedNavNotification.php
index dbd808ba7c..8457b92564 100644
--- a/src/Navigation/Notifications/Factory/FormattedNavNotification.php
+++ b/src/Navigation/Notifications/Factory/FormattedNavNotification.php
@@ -23,6 +23,7 @@ namespace Friendica\Navigation\Notifications\Factory;
 
 use Friendica\BaseFactory;
 use Friendica\Core\Renderer;
+use Friendica\Core\Session;
 use Friendica\Model\Contact;
 use Friendica\Navigation\Notifications\Entity;
 use Friendica\Navigation\Notifications\Exception\NoMessageException;
@@ -71,7 +72,7 @@ class FormattedNavNotification extends BaseFactory
 	 */
 	public function createFromParams(array $contact, string $message, \DateTime $date, Uri $href, bool $seen = false): ValueObject\FormattedNavNotification
 	{
-		$contact['photo'] = Contact::getAvatarUrlForUrl($contact['url'], local_user(), Proxy::SIZE_MICRO);
+		$contact['photo'] = Contact::getAvatarUrlForUrl($contact['url'], Session::getLocalUser(), Proxy::SIZE_MICRO);
 
 		$dateMySQL = $date->format(DateTimeFormat::MYSQL);
 
diff --git a/src/Navigation/Notifications/Factory/FormattedNotify.php b/src/Navigation/Notifications/Factory/FormattedNotify.php
index 8f0fc5bb1f..4868ce1b9a 100644
--- a/src/Navigation/Notifications/Factory/FormattedNotify.php
+++ b/src/Navigation/Notifications/Factory/FormattedNotify.php
@@ -27,6 +27,7 @@ use Friendica\BaseFactory;
 use Friendica\Content\Text\BBCode;
 use Friendica\Core\L10n;
 use Friendica\Core\Protocol;
+use Friendica\Core\Session;
 use Friendica\Database\Database;
 use Friendica\Model\Contact;
 use Friendica\Model\Item;
@@ -210,7 +211,7 @@ class FormattedNotify extends BaseFactory
 
 		$formattedNotifications = new FormattedNotifies();
 		try {
-			$Notifies = $this->notify->selectForUser(local_user(), $conditions, $params);
+			$Notifies = $this->notify->selectForUser(Session::getLocalUser(), $conditions, $params);
 
 			foreach ($Notifies as $Notify) {
 				$formattedNotifications[] = new ValueObject\FormattedNotify(
@@ -243,7 +244,7 @@ class FormattedNotify extends BaseFactory
 	 */
 	public function getNetworkList(bool $seen = false, int $start = 0, int $limit = BaseNotifications::DEFAULT_PAGE_LIMIT): FormattedNotifies
 	{
-		$condition = ['wall' => false, 'uid' => local_user()];
+		$condition = ['wall' => false, 'uid' => Session::getLocalUser()];
 
 		if (!$seen) {
 			$condition['unseen'] = true;
@@ -256,7 +257,7 @@ class FormattedNotify extends BaseFactory
 		$formattedNotifications = new FormattedNotifies();
 
 		try {
-			$userPosts = Post::selectForUser(local_user(), $fields, $condition, $params);
+			$userPosts = Post::selectForUser(Session::getLocalUser(), $fields, $condition, $params);
 			while ($userPost = $this->dba->fetch($userPosts)) {
 				$formattedNotifications[] = $this->createFromFormattedItem($this->formatItem($userPost));
 			}
@@ -279,7 +280,7 @@ class FormattedNotify extends BaseFactory
 	 */
 	public function getPersonalList(bool $seen = false, int $start = 0, int $limit = BaseNotifications::DEFAULT_PAGE_LIMIT): FormattedNotifies
 	{
-		$condition = ['wall' => false, 'uid' => local_user(), 'author-id' => public_contact()];
+		$condition = ['wall' => false, 'uid' => Session::getLocalUser(), 'author-id' => Session::getPublicContact()];
 
 		if (!$seen) {
 			$condition['unseen'] = true;
@@ -292,7 +293,7 @@ class FormattedNotify extends BaseFactory
 		$formattedNotifications = new FormattedNotifies();
 
 		try {
-			$userPosts = Post::selectForUser(local_user(), $fields, $condition, $params);
+			$userPosts = Post::selectForUser(Session::getLocalUser(), $fields, $condition, $params);
 			while ($userPost = $this->dba->fetch($userPosts)) {
 				$formattedNotifications[] = $this->createFromFormattedItem($this->formatItem($userPost));
 			}
@@ -315,7 +316,7 @@ class FormattedNotify extends BaseFactory
 	 */
 	public function getHomeList(bool $seen = false, int $start = 0, int $limit = BaseNotifications::DEFAULT_PAGE_LIMIT): FormattedNotifies
 	{
-		$condition = ['wall' => true, 'uid' => local_user()];
+		$condition = ['wall' => true, 'uid' => Session::getLocalUser()];
 
 		if (!$seen) {
 			$condition['unseen'] = true;
@@ -328,7 +329,7 @@ class FormattedNotify extends BaseFactory
 		$formattedNotifications = new FormattedNotifies();
 
 		try {
-			$userPosts = Post::selectForUser(local_user(), $fields, $condition, $params);
+			$userPosts = Post::selectForUser(Session::getLocalUser(), $fields, $condition, $params);
 			while ($userPost = $this->dba->fetch($userPosts)) {
 				$formattedItem = $this->formatItem($userPost);
 
diff --git a/src/Navigation/Notifications/Factory/Introduction.php b/src/Navigation/Notifications/Factory/Introduction.php
index cfadce5a8f..1b718ad1a5 100644
--- a/src/Navigation/Notifications/Factory/Introduction.php
+++ b/src/Navigation/Notifications/Factory/Introduction.php
@@ -29,6 +29,7 @@ use Friendica\Content\Text\BBCode;
 use Friendica\Core\L10n;
 use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Core\Protocol;
+use Friendica\Core\Session;
 use Friendica\Core\Session\Capability\IHandleSessions;
 use Friendica\Database\Database;
 use Friendica\Model\Contact;
@@ -142,7 +143,7 @@ class Introduction extends BaseFactory
 						'url'            => $intro['furl'],
 						'zrl'            => Contact::magicLink($intro['furl']),
 						'hidden'         => $intro['hidden'] == 1,
-						'post_newfriend' => (intval($this->pConfig->get(local_user(), 'system', 'post_newfriend')) ? '1' : 0),
+						'post_newfriend' => (intval($this->pConfig->get(Session::getLocalUser(), 'system', 'post_newfriend')) ? '1' : 0),
 						'note'           => $intro['note'],
 						'request'        => $intro['frequest'] . '?addr=' . $return_addr]);
 
@@ -167,7 +168,7 @@ class Introduction extends BaseFactory
 						'about'          => BBCode::convert($intro['about'], false),
 						'keywords'       => $intro['keywords'],
 						'hidden'         => $intro['hidden'] == 1,
-						'post_newfriend' => (intval($this->pConfig->get(local_user(), 'system', 'post_newfriend')) ? '1' : 0),
+						'post_newfriend' => (intval($this->pConfig->get(Session::getLocalUser(), 'system', 'post_newfriend')) ? '1' : 0),
 						'url'            => $intro['url'],
 						'zrl'            => Contact::magicLink($intro['url']),
 						'addr'           => $intro['addr'],
diff --git a/src/Network/Probe.php b/src/Network/Probe.php
index 98d195ca18..4261ad84e0 100644
--- a/src/Network/Probe.php
+++ b/src/Network/Probe.php
@@ -27,6 +27,7 @@ use Exception;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
+use Friendica\Core\Session;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\DI;
@@ -316,7 +317,7 @@ class Probe
 		}
 
 		if ($uid == -1) {
-			$uid = local_user();
+			$uid = Session::getLocalUser();
 		}
 
 		if (empty($network) || ($network == Protocol::ACTIVITYPUB)) {
diff --git a/src/Object/Post.php b/src/Object/Post.php
index bbce296727..a86539f1df 100644
--- a/src/Object/Post.php
+++ b/src/Object/Post.php
@@ -104,14 +104,14 @@ class Post
 		if (!empty($data['children'])) {
 			foreach ($data['children'] as $item) {
 				// Only add will be displayed
-				if ($item['network'] === Protocol::MAIL && local_user() != $item['uid']) {
+				if ($item['network'] === Protocol::MAIL && Session::getLocalUser() != $item['uid']) {
 					continue;
 				} elseif (!DI::contentItem()->isVisibleActivity($item)) {
 					continue;
 				}
 
 				// You can always comment on Diaspora and OStatus items
-				if (in_array($item['network'], [Protocol::OSTATUS, Protocol::DIASPORA]) && (local_user() == $item['uid'])) {
+				if (in_array($item['network'], [Protocol::OSTATUS, Protocol::DIASPORA]) && (Session::getLocalUser() == $item['uid'])) {
 					$item['writable'] = true;
 				}
 
@@ -206,7 +206,7 @@ class Post
 		$lock      = ($item['private'] == Item::PRIVATE) ? $privacy : false;
 		$connector = !in_array($item['network'], Protocol::NATIVE_SUPPORT) ? DI::l10n()->t('Connector Message') : false;
 
-		$shareable = in_array($conv->getProfileOwner(), [0, local_user()]) && $item['private'] != Item::PRIVATE;
+		$shareable = in_array($conv->getProfileOwner(), [0, Session::getLocalUser()]) && $item['private'] != Item::PRIVATE;
 		$announceable = $shareable && in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::TWITTER]);
 
 		// On Diaspora only toplevel posts can be reshared
@@ -216,7 +216,7 @@ class Post
 
 		$edpost = false;
 
-		if (local_user()) {
+		if (Session::getLocalUser()) {
 			if (Strings::compareLink(DI::session()->get('my_url'), $item['author-link'])) {
 				if ($item['event-id'] != 0) {
 					$edpost = ['events/event/' . $item['event-id'], DI::l10n()->t('Edit')];
@@ -224,7 +224,7 @@ class Post
 					$edpost = ['editpost/' . $item['id'], DI::l10n()->t('Edit')];
 				}
 			}
-			$dropping = in_array($item['uid'], [0, local_user()]);
+			$dropping = in_array($item['uid'], [0, Session::getLocalUser()]);
 		}
 
 		// Editing on items of not subscribed users isn't currently possible
@@ -234,7 +234,7 @@ class Post
 			$edpost = false;
 		}
 
-		if (($this->getDataValue('uid') == local_user()) || $this->isVisiting()) {
+		if (($this->getDataValue('uid') == Session::getLocalUser()) || $this->isVisiting()) {
 			$dropping = true;
 		}
 
@@ -249,7 +249,7 @@ class Post
 
 		$drop = false;
 		$block = false;
-		if (local_user()) {
+		if (Session::getLocalUser()) {
 			$drop = [
 				'dropping' => $dropping,
 				'pagedrop' => $item['pagedrop'],
@@ -258,7 +258,7 @@ class Post
 			];
 		}
 
-		if (!$item['self'] && local_user()) {
+		if (!$item['self'] && Session::getLocalUser()) {
 			$block = [
 				'blocking' => true,
 				'block'   => DI::l10n()->t('Block %s', $item['author-name']),
@@ -266,7 +266,7 @@ class Post
 			];
 		}
 
-		$filer = local_user() ? DI::l10n()->t('Save to folder') : false;
+		$filer = Session::getLocalUser() ? DI::l10n()->t('Save to folder') : false;
 
 		$profile_name = $item['author-name'];
 		if (!empty($item['author-link']) && empty($item['author-name'])) {
@@ -327,8 +327,8 @@ class Post
 		$tagger = '';
 
 		if ($this->isToplevel()) {
-			if (local_user()) {
-				$ignored = PostModel\ThreadUser::getIgnored($item['uri-id'], local_user());
+			if (Session::getLocalUser()) {
+				$ignored = PostModel\ThreadUser::getIgnored($item['uri-id'], Session::getLocalUser());
 				if ($item['mention'] || $ignored) {
 					$ignore = [
 						'do'        => DI::l10n()->t('Ignore thread'),
@@ -351,7 +351,7 @@ class Post
 					'starred'   => DI::l10n()->t('Starred'),
 				];
 
-				if ($conv->getProfileOwner() == local_user() && ($item['uid'] != 0)) {
+				if ($conv->getProfileOwner() == Session::getLocalUser() && ($item['uid'] != 0)) {
 					if ($origin && in_array($item['private'], [Item::PUBLIC, Item::UNLISTED])) {
 						$ispinned = ($item['featured'] ? 'pinned' : 'unpinned');
 
@@ -397,17 +397,17 @@ class Post
 
 		$body_html = Item::prepareBody($item, true);
 
-		list($categories, $folders) = DI::contentItem()->determineCategoriesTerms($item, local_user());
+		list($categories, $folders) = DI::contentItem()->determineCategoriesTerms($item, Session::getLocalUser());
 
 		if (!empty($item['title'])) {
 			$title = $item['title'];
-		} elseif (!empty($item['content-warning']) && DI::pConfig()->get(local_user(), 'system', 'disable_cw', false)) {
+		} elseif (!empty($item['content-warning']) && DI::pConfig()->get(Session::getLocalUser(), 'system', 'disable_cw', false)) {
 			$title = ucfirst($item['content-warning']);
 		} else {
 			$title = '';
 		}
 
-		if (DI::pConfig()->get(local_user(), 'system', 'hide_dislike')) {
+		if (DI::pConfig()->get(Session::getLocalUser(), 'system', 'hide_dislike')) {
 			$buttons['dislike'] = false;
 		}
 
@@ -434,7 +434,7 @@ class Post
 		}
 
 		// Fetching of Diaspora posts doesn't always work. There are issues with reshares and possibly comments
-		if (!local_user() && ($item['network'] != Protocol::DIASPORA) && !empty(DI::session()->get('remote_comment'))) {
+		if (!Session::getLocalUser() && ($item['network'] != Protocol::DIASPORA) && !empty(DI::session()->get('remote_comment'))) {
 			$remote_comment = [DI::l10n()->t('Comment this item on your system'), DI::l10n()->t('Remote comment'),
 				str_replace('{uri}', urlencode($item['uri']), DI::session()->get('remote_comment'))];
 
@@ -642,7 +642,7 @@ class Post
 		/*
 		 * Only add what will be displayed
 		 */
-		if ($item->getDataValue('network') === Protocol::MAIL && local_user() != $item->getDataValue('uid')) {
+		if ($item->getDataValue('network') === Protocol::MAIL && Session::getLocalUser() != $item->getDataValue('uid')) {
 			return false;
 		} elseif ($activity->match($item->getDataValue('verb'), Activity::LIKE) ||
 		          $activity->match($item->getDataValue('verb'), Activity::DISLIKE)) {
@@ -850,7 +850,7 @@ class Post
 			// This will allow us to comment on wall-to-wall items owned by our friends
 			// and community forums even if somebody else wrote the post.
 			// bug #517 - this fixes for conversation owner
-			if ($conv->getMode() == 'profile' && $conv->getProfileOwner() == local_user()) {
+			if ($conv->getMode() == 'profile' && $conv->getProfileOwner() == Session::getLocalUser()) {
 				return true;
 			}
 
@@ -898,20 +898,20 @@ class Post
 	{
 		$a = DI::app();
 
-		if (!local_user()) {
+		if (!Session::getLocalUser()) {
 			return '';
 		}
 
 		$owner = User::getOwnerDataById($a->getLoggedInUserId());
 		$item = $this->getData();
 
-		if (!empty($item['content-warning']) && Feature::isEnabled(local_user(), 'add_abstract')) {
+		if (!empty($item['content-warning']) && Feature::isEnabled(Session::getLocalUser(), 'add_abstract')) {
 			$text = '[abstract=' . Protocol::ACTIVITYPUB . ']' . $item['content-warning'] . "[/abstract]\n";
 		} else {
 			$text = '';
 		}
 
-		if (!Feature::isEnabled(local_user(), 'explicit_mentions')) {
+		if (!Feature::isEnabled(Session::getLocalUser(), 'explicit_mentions')) {
 			return $text;
 		}
 
@@ -958,7 +958,7 @@ class Post
 			 */
 			$qcomment = null;
 			if (Addon::isEnabled('qcomment')) {
-				$words = DI::pConfig()->get(local_user(), 'qcomment', 'words');
+				$words = DI::pConfig()->get(Session::getLocalUser(), 'qcomment', 'words');
 				$qcomment = $words ? explode("\n", $words) : [];
 			}
 
diff --git a/src/Object/Thread.php b/src/Object/Thread.php
index dd10a6aece..a628749001 100644
--- a/src/Object/Thread.php
+++ b/src/Object/Thread.php
@@ -23,6 +23,7 @@ namespace Friendica\Object;
 
 use Friendica\Core\Logger;
 use Friendica\Core\Protocol;
+use Friendica\Core\Session;
 use Friendica\DI;
 use Friendica\Protocol\Activity;
 use Friendica\Security\Security;
@@ -75,7 +76,7 @@ class Thread
 		switch ($mode) {
 			case 'network':
 			case 'notes':
-				$this->profile_owner = local_user();
+				$this->profile_owner = Session::getLocalUser();
 				$this->writable = true;
 				break;
 			case 'profile':
@@ -168,7 +169,7 @@ class Thread
 		/*
 		 * Only add will be displayed
 		 */
-		if ($item->getDataValue('network') === Protocol::MAIL && local_user() != $item->getDataValue('uid')) {
+		if ($item->getDataValue('network') === Protocol::MAIL && Session::getLocalUser() != $item->getDataValue('uid')) {
 			Logger::info('[WARN] Conversation::addThread : Thread is a mail ('. $item->getId() .').');
 			return false;
 		}
@@ -201,7 +202,7 @@ class Thread
 		$result = [];
 
 		foreach ($this->parents as $item) {
-			if ($item->getDataValue('network') === Protocol::MAIL && local_user() != $item->getDataValue('uid')) {
+			if ($item->getDataValue('network') === Protocol::MAIL && Session::getLocalUser() != $item->getDataValue('uid')) {
 				continue;
 			}
 
diff --git a/src/Security/BasicAuth.php b/src/Security/BasicAuth.php
index fc31d34b07..257e52d46e 100644
--- a/src/Security/BasicAuth.php
+++ b/src/Security/BasicAuth.php
@@ -191,7 +191,7 @@ class BasicAuth
 
 		Hook::callAll('logged_in', $record);
 
-		self::$current_user_id = local_user();
+		self::$current_user_id = Session::getLocalUser();
 
 		return self::$current_user_id;
 	}
diff --git a/src/Security/Security.php b/src/Security/Security.php
index 5fda54d46c..f0b33501f9 100644
--- a/src/Security/Security.php
+++ b/src/Security/Security.php
@@ -40,12 +40,12 @@ class Security
 			return false;
 		}
 
-		$uid = local_user();
+		$uid = Session::getLocalUser();
 		if ($uid == $owner) {
 			return true;
 		}
 
-		if (local_user() && ($owner == 0)) {
+		if (Session::getLocalUser() && ($owner == 0)) {
 			return true;
 		}
 
@@ -93,7 +93,7 @@ class Security
 	 */
 	public static function getPermissionsSQLByUserId(int $owner_id, bool $accessible = false)
 	{
-		$local_user = local_user();
+		$local_user = Session::getLocalUser();
 		$remote_contact = Session::getRemoteContactID($owner_id);
 		$acc_sql = '';
 
diff --git a/src/Util/Temporal.php b/src/Util/Temporal.php
index cc6a078fe1..72271c06f1 100644
--- a/src/Util/Temporal.php
+++ b/src/Util/Temporal.php
@@ -24,6 +24,7 @@ namespace Friendica\Util;
 use DateTime;
 use DateTimeZone;
 use Friendica\Core\Renderer;
+use Friendica\Core\Session;
 use Friendica\Database\DBA;
 use Friendica\DI;
 
@@ -238,7 +239,7 @@ class Temporal
 		bool $required = false): string
 	{
 		// First day of the week (0 = Sunday)
-		$firstDay = DI::pConfig()->get(local_user(), 'system', 'first_day_of_week', 0);
+		$firstDay = DI::pConfig()->get(Session::getLocalUser(), 'system', 'first_day_of_week', 0);
 
 		$lang = substr(DI::l10n()->getCurrentLang(), 0, 2);
 
diff --git a/view/theme/duepuntozero/config.php b/view/theme/duepuntozero/config.php
index 7d2c3f4256..1a2d231f43 100644
--- a/view/theme/duepuntozero/config.php
+++ b/view/theme/duepuntozero/config.php
@@ -1,19 +1,36 @@
 <?php
 /**
- * Theme settings
+ * @copyright Copyright (C) 2010-2022, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
  */
 
 use Friendica\App;
 use Friendica\Core\Renderer;
+use Friendica\Core\Session;
 use Friendica\DI;
 
 function theme_content(App $a)
 {
-	if (!local_user()) {
+	if (!Session::getLocalUser()) {
 		return;
 	}
 
-	$colorset = DI::pConfig()->get(local_user(), 'duepuntozero', 'colorset');
+	$colorset = DI::pConfig()->get(Session::getLocalUser(), 'duepuntozero', 'colorset');
 	$user = true;
 
 	return clean_form($a, $colorset, $user);
@@ -21,12 +38,12 @@ function theme_content(App $a)
 
 function theme_post(App $a)
 {
-	if (! local_user()) {
+	if (! Session::getLocalUser()) {
 		return;
 	}
 
 	if (isset($_POST['duepuntozero-settings-submit'])) {
-		DI::pConfig()->set(local_user(), 'duepuntozero', 'colorset', $_POST['duepuntozero_colorset']);
+		DI::pConfig()->set(Session::getLocalUser(), 'duepuntozero', 'colorset', $_POST['duepuntozero_colorset']);
 	}
 }
 
@@ -59,7 +76,7 @@ function clean_form(App $a, &$colorset, $user)
 	];
 
 	if ($user) {
-		$color = DI::pConfig()->get(local_user(), 'duepuntozero', 'colorset');
+		$color = DI::pConfig()->get(Session::getLocalUser(), 'duepuntozero', 'colorset');
 	} else {
 		$color = DI::config()->get('duepuntozero', 'colorset');
 	}
diff --git a/view/theme/duepuntozero/theme.php b/view/theme/duepuntozero/theme.php
index 327a1e73ba..70190eb02c 100644
--- a/view/theme/duepuntozero/theme.php
+++ b/view/theme/duepuntozero/theme.php
@@ -21,6 +21,7 @@
 
 use Friendica\App;
 use Friendica\Core\Renderer;
+use Friendica\Core\Session;
 use Friendica\DI;
 
 /*
@@ -34,7 +35,7 @@ function duepuntozero_init(App $a) {
 	$colorset = null;
 
 	if (DI::mode()->has(App\Mode::MAINTENANCEDISABLED)) {
-		$colorset = DI::pConfig()->get(local_user(), 'duepuntozero', 'colorset');
+		$colorset = DI::pConfig()->get(Session::getLocalUser(), 'duepuntozero', 'colorset');
 		if (!$colorset)
 			$colorset = DI::config()->get('duepuntozero', 'colorset');          // user setting have priority, then node settings
 	}
diff --git a/view/theme/frio/config.php b/view/theme/frio/config.php
index 2dcf002048..4c7a13542b 100644
--- a/view/theme/frio/config.php
+++ b/view/theme/frio/config.php
@@ -21,13 +21,14 @@
 
 use Friendica\App;
 use Friendica\Core\Renderer;
+use Friendica\Core\Session;
 use Friendica\DI;
 
 require_once 'view/theme/frio/php/Image.php';
 
 function theme_post(App $a)
 {
-	if (!local_user()) {
+	if (!Session::getLocalUser()) {
 		return;
 	}
 
@@ -47,12 +48,12 @@ function theme_post(App $a)
 			'always_open_compose',
 		] as $field) {
 			if (isset($_POST['frio_' . $field])) {
-				DI::pConfig()->set(local_user(), 'frio', $field, $_POST['frio_' . $field]);
+				DI::pConfig()->set(Session::getLocalUser(), 'frio', $field, $_POST['frio_' . $field]);
 			}
 
 		}
 
-		DI::pConfig()->set(local_user(), 'frio', 'css_modified',     time());
+		DI::pConfig()->set(Session::getLocalUser(), 'frio', 'css_modified',     time());
 	}
 }
 
@@ -88,13 +89,13 @@ function theme_admin_post(App $a)
 
 function theme_content(): string
 {
-	if (!local_user()) {
+	if (!Session::getLocalUser()) {
 		return '';
 	}
 
 	$arr = [
-		'scheme' => DI::pConfig()->get(local_user(), 'frio', 'scheme',
-			DI::pConfig()->get(local_user(), 'frio', 'schema',
+		'scheme' => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'scheme',
+			DI::pConfig()->get(Session::getLocalUser(), 'frio', 'schema',
 				DI::config()->get('frio', 'scheme',
 					DI::config()->get('frio', 'schema')
 				)
@@ -102,15 +103,15 @@ function theme_content(): string
 		),
 
 		'share_string'        => '',
-		'scheme_accent'       => DI::pConfig()->get(local_user(), 'frio', 'scheme_accent'      , DI::config()->get('frio', 'scheme_accent')),
-		'nav_bg'              => DI::pConfig()->get(local_user(), 'frio', 'nav_bg'             , DI::config()->get('frio', 'nav_bg')),
-		'nav_icon_color'      => DI::pConfig()->get(local_user(), 'frio', 'nav_icon_color'     , DI::config()->get('frio', 'nav_icon_color')),
-		'link_color'          => DI::pConfig()->get(local_user(), 'frio', 'link_color'         , DI::config()->get('frio', 'link_color')),
-		'background_color'    => DI::pConfig()->get(local_user(), 'frio', 'background_color'   , DI::config()->get('frio', 'background_color')),
-		'contentbg_transp'    => DI::pConfig()->get(local_user(), 'frio', 'contentbg_transp'   , DI::config()->get('frio', 'contentbg_transp')),
-		'background_image'    => DI::pConfig()->get(local_user(), 'frio', 'background_image'   , DI::config()->get('frio', 'background_image')),
-		'bg_image_option'     => DI::pConfig()->get(local_user(), 'frio', 'bg_image_option'    , DI::config()->get('frio', 'bg_image_option')),
-		'always_open_compose' => DI::pConfig()->get(local_user(), 'frio', 'always_open_compose', DI::config()->get('frio', 'always_open_compose', false)),
+		'scheme_accent'       => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'scheme_accent'      , DI::config()->get('frio', 'scheme_accent')),
+		'nav_bg'              => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'nav_bg'             , DI::config()->get('frio', 'nav_bg')),
+		'nav_icon_color'      => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'nav_icon_color'     , DI::config()->get('frio', 'nav_icon_color')),
+		'link_color'          => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'link_color'         , DI::config()->get('frio', 'link_color')),
+		'background_color'    => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'background_color'   , DI::config()->get('frio', 'background_color')),
+		'contentbg_transp'    => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'contentbg_transp'   , DI::config()->get('frio', 'contentbg_transp')),
+		'background_image'    => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'background_image'   , DI::config()->get('frio', 'background_image')),
+		'bg_image_option'     => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'bg_image_option'    , DI::config()->get('frio', 'bg_image_option')),
+		'always_open_compose' => DI::pConfig()->get(Session::getLocalUser(), 'frio', 'always_open_compose', DI::config()->get('frio', 'always_open_compose', false)),
 	];
 
 	return frio_form($arr);
@@ -118,7 +119,7 @@ function theme_content(): string
 
 function theme_admin(): string
 {
-	if (!local_user()) {
+	if (!Session::getLocalUser()) {
 		return '';
 	}
 
diff --git a/view/theme/frio/php/scheme.php b/view/theme/frio/php/scheme.php
index 994f2eb147..26c3588776 100644
--- a/view/theme/frio/php/scheme.php
+++ b/view/theme/frio/php/scheme.php
@@ -34,6 +34,7 @@
  *    'overwrites' => Variables which overwriting custom settings
  */
 
+use Friendica\Core\Session;
 use Friendica\DI;
 use Friendica\Util\Strings;
 
@@ -42,7 +43,7 @@ function get_scheme_info($scheme)
 	$theme = DI::app()->getCurrentTheme();
 	$themepath = 'view/theme/' . $theme . '/';
 	if (empty($scheme)) {
-		$scheme = DI::pConfig()->get(local_user(), 'frio', 'scheme', DI::pConfig()->get(local_user(), 'frio', 'schema', '---'));
+		$scheme = DI::pConfig()->get(Session::getLocalUser(), 'frio', 'scheme', DI::pConfig()->get(Session::getLocalUser(), 'frio', 'schema', '---'));
 	}
 
 	$scheme = Strings::sanitizeFilePathItem($scheme);
diff --git a/view/theme/frio/theme.php b/view/theme/frio/theme.php
index 2913a15533..ce1e376e66 100644
--- a/view/theme/frio/theme.php
+++ b/view/theme/frio/theme.php
@@ -215,8 +215,8 @@ function frio_remote_nav(App $a, array &$nav_info)
 		$fields = ['id', 'url', 'avatar', 'micro', 'name', 'nick', 'baseurl', 'updated'];
 		if ($a->isLoggedIn()) {
 			$remoteUser = Contact::selectFirst($fields, ['uid' => $a->getLoggedInUserId(), 'self' => true]);
-		} elseif (!local_user() && remote_user()) {
-			$remoteUser                = Contact::getById(remote_user(), $fields);
+		} elseif (!Session::getLocalUser() && Session::getRemoteUser()) {
+			$remoteUser                = Contact::getById(Session::getRemoteUser(), $fields);
 			$nav_info['nav']['remote'] = DI::l10n()->t('Guest');
 		} elseif (Profile::getMyURL()) {
 			$remoteUser                = Contact::getByURL($homelink, null, $fields);
@@ -233,7 +233,7 @@ function frio_remote_nav(App $a, array &$nav_info)
 			$server_url           = $remoteUser['baseurl'];
 		}
 
-		if (!local_user() && !empty($server_url) && !is_null($remoteUser)) {
+		if (!Session::getLocalUser() && !empty($server_url) && !is_null($remoteUser)) {
 			// user menu
 			$nav_info['nav']['usermenu'][] = [$server_url . '/profile/' . $remoteUser['nick'], DI::l10n()->t('Status'), '', DI::l10n()->t('Your posts and conversations')];
 			$nav_info['nav']['usermenu'][] = [$server_url . '/profile/' . $remoteUser['nick'] . '/profile', DI::l10n()->t('Profile'), '', DI::l10n()->t('Your profile page')];
@@ -257,8 +257,8 @@ function frio_display_item(App $a, &$arr)
 	// Add follow to the item menu
 	$followThread = [];
 	if (
-		local_user()
-		&& in_array($arr['item']['uid'], [0, local_user()])
+		Session::getLocalUser()
+		&& in_array($arr['item']['uid'], [0, Session::getLocalUser()])
 		&& $arr['item']['gravity'] == Item::GRAVITY_PARENT
 		&& !$arr['item']['self']
 		&& !$arr['item']['mention']
diff --git a/view/theme/quattro/config.php b/view/theme/quattro/config.php
index 64284eaa06..48ef298f98 100644
--- a/view/theme/quattro/config.php
+++ b/view/theme/quattro/config.php
@@ -1,35 +1,52 @@
 <?php
 /**
- * Theme settings
+ * @copyright Copyright (C) 2010-2022, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
  */
 
 use Friendica\App;
 use Friendica\Core\Renderer;
+use Friendica\Core\Session;
 use Friendica\DI;
 
 function theme_content(App $a) {
-	if (!local_user()) {
+	if (!Session::getLocalUser()) {
 		return;
 	}
 
-	$align = DI::pConfig()->get(local_user(), 'quattro', 'align' );
-	$color = DI::pConfig()->get(local_user(), 'quattro', 'color' );
-	$tfs = DI::pConfig()->get(local_user(),"quattro","tfs");
-	$pfs = DI::pConfig()->get(local_user(),"quattro","pfs");
+	$align = DI::pConfig()->get(Session::getLocalUser(), 'quattro', 'align' );
+	$color = DI::pConfig()->get(Session::getLocalUser(), 'quattro', 'color' );
+	$tfs = DI::pConfig()->get(Session::getLocalUser(),"quattro","tfs");
+	$pfs = DI::pConfig()->get(Session::getLocalUser(),"quattro","pfs");
 
 	return quattro_form($a,$align, $color, $tfs, $pfs);
 }
 
 function theme_post(App $a) {
-	if (! local_user()) {
+	if (! Session::getLocalUser()) {
 		return;
 	}
 
 	if (isset($_POST['quattro-settings-submit'])){
-		DI::pConfig()->set(local_user(), 'quattro', 'align', $_POST['quattro_align']);
-		DI::pConfig()->set(local_user(), 'quattro', 'color', $_POST['quattro_color']);
-		DI::pConfig()->set(local_user(), 'quattro', 'tfs', $_POST['quattro_tfs']);
-		DI::pConfig()->set(local_user(), 'quattro', 'pfs', $_POST['quattro_pfs']);
+		DI::pConfig()->set(Session::getLocalUser(), 'quattro', 'align', $_POST['quattro_align']);
+		DI::pConfig()->set(Session::getLocalUser(), 'quattro', 'color', $_POST['quattro_color']);
+		DI::pConfig()->set(Session::getLocalUser(), 'quattro', 'tfs', $_POST['quattro_tfs']);
+		DI::pConfig()->set(Session::getLocalUser(), 'quattro', 'pfs', $_POST['quattro_pfs']);
 	}
 }
 
diff --git a/view/theme/vier/config.php b/view/theme/vier/config.php
index 5891aa32f4..28aebf9700 100644
--- a/view/theme/vier/config.php
+++ b/view/theme/vier/config.php
@@ -1,17 +1,34 @@
 <?php
 /**
- * Theme settings
+ * @copyright Copyright (C) 2010-2022, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
  */
 
 use Friendica\App;
 use Friendica\Core\Renderer;
+use Friendica\Core\Session;
 use Friendica\DI;
 
 require_once __DIR__ . '/theme.php';
 
 function theme_content(App $a)
 {
-	if (!local_user()) {
+	if (!Session::getLocalUser()) {
 		return;
 	}
 
@@ -19,7 +36,7 @@ function theme_content(App $a)
 		return;
 	}
 
-	$style = DI::pConfig()->get(local_user(), 'vier', 'style');
+	$style = DI::pConfig()->get(Session::getLocalUser(), 'vier', 'style');
 
 	if ($style == "") {
 		$style = DI::config()->get('vier', 'style');
@@ -42,18 +59,18 @@ function theme_content(App $a)
 
 function theme_post(App $a)
 {
-	if (! local_user()) {
+	if (! Session::getLocalUser()) {
 		return;
 	}
 
 	if (isset($_POST['vier-settings-submit'])) {
-		DI::pConfig()->set(local_user(), 'vier', 'style', $_POST['vier_style']);
-		DI::pConfig()->set(local_user(), 'vier', 'show_pages', $_POST['vier_show_pages']);
-		DI::pConfig()->set(local_user(), 'vier', 'show_profiles', $_POST['vier_show_profiles']);
-		DI::pConfig()->set(local_user(), 'vier', 'show_helpers', $_POST['vier_show_helpers']);
-		DI::pConfig()->set(local_user(), 'vier', 'show_services', $_POST['vier_show_services']);
-		DI::pConfig()->set(local_user(), 'vier', 'show_friends', $_POST['vier_show_friends']);
-		DI::pConfig()->set(local_user(), 'vier', 'show_lastusers', $_POST['vier_show_lastusers']);
+		DI::pConfig()->set(Session::getLocalUser(), 'vier', 'style', $_POST['vier_style']);
+		DI::pConfig()->set(Session::getLocalUser(), 'vier', 'show_pages', $_POST['vier_show_pages']);
+		DI::pConfig()->set(Session::getLocalUser(), 'vier', 'show_profiles', $_POST['vier_show_profiles']);
+		DI::pConfig()->set(Session::getLocalUser(), 'vier', 'show_helpers', $_POST['vier_show_helpers']);
+		DI::pConfig()->set(Session::getLocalUser(), 'vier', 'show_services', $_POST['vier_show_services']);
+		DI::pConfig()->set(Session::getLocalUser(), 'vier', 'show_friends', $_POST['vier_show_friends']);
+		DI::pConfig()->set(Session::getLocalUser(), 'vier', 'show_lastusers', $_POST['vier_show_lastusers']);
 	}
 }
 
diff --git a/view/theme/vier/theme.php b/view/theme/vier/theme.php
index a548d0a7dc..ec82cf428d 100644
--- a/view/theme/vier/theme.php
+++ b/view/theme/vier/theme.php
@@ -1,5 +1,22 @@
 <?php
 /**
+ * @copyright Copyright (C) 2010-2022, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
  * Name: Vier
  * Version: 1.2
  * Author: Fabio <http://kirgroup.com/profile/fabrixxm>
@@ -14,6 +31,7 @@ use Friendica\Content\ForumManager;
 use Friendica\Core\Addon;
 use Friendica\Core\Renderer;
 use Friendica\Core\Search;
+use Friendica\Core\Session;
 use Friendica\Database\DBA;
 use Friendica\DI;
 use Friendica\Model\Contact;
@@ -35,7 +53,7 @@ function vier_init(App $a)
 		DI::mode()->has(App\Mode::MAINTENANCEDISABLED)
 		&& (
 			$args->get(0) === 'profile' && $args->get(1) === ($a->getLoggedInUserNickname() ?? '')
-			|| $args->get(0) === 'network' && local_user()
+			|| $args->get(0) === 'network' && Session::getLocalUser()
 		)
 	) {
 		vier_community_info();
@@ -97,8 +115,8 @@ EOT;
 
 function get_vier_config($key, $default = false, $admin = false)
 {
-	if (local_user() && !$admin) {
-		$result = DI::pConfig()->get(local_user(), "vier", $key);
+	if (Session::getLocalUser() && !$admin) {
+		$result = DI::pConfig()->get(Session::getLocalUser(), "vier", $key);
 		if (!is_null($result)) {
 			return $result;
 		}
@@ -127,7 +145,7 @@ function vier_community_info()
 
 	// comunity_profiles
 	if ($show_profiles) {
-		$contacts = Contact\Relation::getSuggestions(local_user(), 0, 9);
+		$contacts = Contact\Relation::getSuggestions(Session::getLocalUser(), 0, 9);
 
 		$tpl = Renderer::getMarkupTemplate('ch_directory_item.tpl');
 		if (DBA::isResult($contacts)) {
@@ -174,7 +192,7 @@ function vier_community_info()
 	}
 
 	//right_aside FIND FRIENDS
-	if ($show_friends && local_user()) {
+	if ($show_friends && Session::getLocalUser()) {
 		$nv = [];
 		$nv['findpeople'] = DI::l10n()->t('Find People');
 		$nv['desc'] = DI::l10n()->t('Enter name or interest');
@@ -193,8 +211,8 @@ function vier_community_info()
 	}
 
 	//Community_Pages at right_aside
-	if ($show_pages && local_user()) {
-		$aside['$page'] = ForumManager::widget('network/forum', local_user());;
+	if ($show_pages && Session::getLocalUser()) {
+		$aside['$page'] = ForumManager::widget('network/forum', Session::getLocalUser());;
 	}
 	// END Community Page