diff --git a/mod/item.php b/mod/item.php
index fff4f712c3..ac5b11c4d9 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -469,43 +469,10 @@ function item_post(App $a) {
 
 	$match = null;
 
-	/// @todo these lines should be moved to Model/Photo
-	if (!$preview && preg_match_all("/\[img([\=0-9x]*?)\](.*?)\[\/img\]/",$body,$match)) {
-		$images = $match[2];
-		if (count($images)) {
-
-			$objecttype = ACTIVITY_OBJ_IMAGE;
-
-			foreach ($images as $image) {
-				if (!stristr($image, System::baseUrl() . '/photo/')) {
-					continue;
-				}
-				$image_uri = substr($image,strrpos($image,'/') + 1);
-				$image_uri = substr($image_uri,0, strpos($image_uri,'-'));
-				if (!strlen($image_uri)) {
-					continue;
-				}
-
-				// Ensure to only modify photos that you own
-				$srch = '<' . intval($original_contact_id) . '>';
-
-				$condition = [
-					'allow_cid' => $srch, 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '',
-					'resource-id' => $image_uri, 'uid' => $profile_uid
-				];
-				if (!Photo::exists($condition)) {
-					continue;
-				}
-
-				$fields = ['allow_cid' => $str_contact_allow, 'allow_gid' => $str_group_allow,
-						'deny_cid' => $str_contact_deny, 'deny_gid' => $str_group_deny];
-				$condition = ['resource-id' => $image_uri, 'uid' => $profile_uid];
-				Photo::update($fields, $condition);
-			}
-		}
+	if (!$preview && Photo::setPermissionFromBody($body, $profile_uid, $original_contact_id, $str_contact_allow, $str_group_allow, $str_contact_deny, $str_group_deny)) {
+		$objecttype = ACTIVITY_OBJ_IMAGE;
 	}
 
-
 	/*
 	 * Next link in any attachment references we find in the post.
 	 */
diff --git a/src/Model/Photo.php b/src/Model/Photo.php
index 9fa279cf88..4c1211b3cc 100644
--- a/src/Model/Photo.php
+++ b/src/Model/Photo.php
@@ -10,6 +10,7 @@ use Friendica\BaseObject;
 use Friendica\Core\Cache;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
+use Friendica\Core\Logger;
 use Friendica\Core\StorageManager;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
@@ -607,4 +608,60 @@ class Photo extends BaseObject
 	{
 		return System::createGUID(32, false);
 	}
+
+	/**
+	 * Generate a unique photo ID.
+	 *
+	 * @todo This function currently does have some flaws:
+	 * - Sharing a post with a form will create a photo that only the forum can see.
+	 * - Sharing a photo non public that been share non public before doesn't alter the permissions.
+	 *
+	 * @return string
+	 * @throws \Exception
+	 */
+	public static function setPermissionFromBody($body, $uid, $original_contact_id, $str_contact_allow, $str_group_allow, $str_contact_deny, $str_group_deny)
+	{
+		// Simplify image codes
+		$img_body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
+		$img_body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $img_body);
+
+		// Search for images
+		if (!preg_match_all("/\[img\](.*?)\[\/img\]/", $img_body, $match)) {
+			return false;
+		}
+		$images = $match[1];
+		if (empty($images)) {
+			return false;
+		}
+
+		foreach ($images as $image) {
+			if (!stristr($image, System::baseUrl() . '/photo/')) {
+				continue;
+			}
+			$image_uri = substr($image,strrpos($image,'/') + 1);
+			$image_uri = substr($image_uri,0, strpos($image_uri,'-'));
+			if (!strlen($image_uri)) {
+				continue;
+			}
+
+			// Ensure to only modify photos that you own
+			$srch = '<' . intval($original_contact_id) . '>';
+
+			$condition = [
+				'allow_cid' => $srch, 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '',
+				'resource-id' => $image_uri, 'uid' => $uid
+			];
+			if (!Photo::exists($condition)) {
+				continue;
+			}
+
+			$fields = ['allow_cid' => $str_contact_allow, 'allow_gid' => $str_group_allow,
+					'deny_cid' => $str_contact_deny, 'deny_gid' => $str_group_deny];
+			$condition = ['resource-id' => $image_uri, 'uid' => $uid];
+			Logger::info('Set permissions', ['condition' => $condition, 'permissions' => $fields]);
+			Photo::update($fields, $condition);
+		}
+
+		return true;
+	}
 }