Append author's contact id to allowed contacts to prevent empty ACL for private posts

diff --git a/mod/item.php b/mod/item.php
index 6864dab..d1e1d06 100644 (file)
--- a/mod/item.php
+++ b/mod/item.php
@@ -50,6 +50,7 @@ use Friendica\Model\Notify\Type;
 use Friendica\Model\Photo;
 use Friendica\Model\Post;
 use Friendica\Model\Tag;
+use Friendica\Model\User;
 use Friendica\Network\HTTPException;
 use Friendica\Object\EMail\ItemCCEMail;
 use Friendica\Protocol\Activity;
@@ -195,8 +196,7 @@ function item_post(App $a) {
                $orig_post = Item::selectFirst(Item::ITEM_FIELDLIST, ['id' => $post_id]);
        }
 
-       $user = DBA::selectFirst('user', [], ['uid' => $profile_uid]);
-
+       $user = User::getById($profile_uid, ['allow_cid', 'allow_gid', 'deny_cid', 'deny_gid']);
        if (!DBA::isResult($user) && !$toplevel_item_id) {
                return 0;
        }
@@ -272,6 +272,11 @@ function item_post(App $a) {
                        $str_group_allow   = isset($_REQUEST['group_allow'])   ? $aclFormatter->toString($_REQUEST['group_allow'])   : $user['allow_gid'] ?? '';
                        $str_contact_deny  = isset($_REQUEST['contact_deny'])  ? $aclFormatter->toString($_REQUEST['contact_deny'])  : $user['deny_cid']  ?? '';
                        $str_group_deny    = isset($_REQUEST['group_deny'])    ? $aclFormatter->toString($_REQUEST['group_deny'])    : $user['deny_gid']  ?? '';
+
+                       // Since we know from the visibility parameter it should be private, we have to prevent the empty ACL case
+                       // that would make the item public. So we always append the author's contact id to the allowed contacts.
+                       // See https://github.com/friendica/friendica/issues/9672
+                       $str_contact_allow .= $aclFormatter->toString(Contact::getPublicIdByUserId($uid));
                }
 
                $title             = trim($_REQUEST['title']    ?? '');
@@ -750,7 +755,7 @@ function item_post(App $a) {
                                'type'  => Type::COMMENT,
                                'otype' => Notify\ObjectType::ITEM,
                                'verb'  => Activity::POST,
-                               'uid'   => $user['uid'],
+                               'uid'   => $profile_uid,
                                'cid'   => $datarray['author-id'],
                                'item'  => $datarray,
                                'link'  => DI::baseUrl() . '/display/' . urlencode($datarray['guid']),
@@ -760,7 +765,7 @@ function item_post(App $a) {
                                'type'  => Type::WALL,
                                'otype' => Notify\ObjectType::ITEM,
                                'verb'  => Activity::POST,
-                               'uid'   => $user['uid'],
+                               'uid'   => $profile_uid,
                                'cid'   => $datarray['author-id'],
                                'item'  => $datarray,
                                'link'  => DI::baseUrl() . '/display/' . urlencode($datarray['guid']),