[PATCH pve-access-control 2/2] fix #7520: access-control: add SDN ACL cleanup helper

[David Riley <d.riley@proxmox.com>]

Add a helper to prune ACL nodes under the `/sdn/` path.
Traverse the internal tree to delete target nodes.

Signed-off-by: David Riley <d.riley@proxmox.com>
---
 src/PVE/AccessControl.pm | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/src/PVE/AccessControl.pm b/src/PVE/AccessControl.pm
index 10e1f27..fe0c7a8 100644
--- a/src/PVE/AccessControl.pm
+++ b/src/PVE/AccessControl.pm
@@ -1891,6 +1891,46 @@ sub roles {
     return $roles;
 }
 
+sub remove_sdn_resource_access {
+    # $paths is e.g. [ ['zones', '<zone>'], ['zones', '<zone>', '<vnet>'] ]
+    my ($paths) = @_;
+
+    my $delSDNResourceFn = sub {
+        my $usercfg = cfs_read_file("user.cfg");
+        my $modified = 0;
+
+        foreach my $segments (@$paths) {
+            my @full_path = ('sdn', @$segments);
+            my $current = $usercfg->{acl_root};
+            my $parent = undef;
+            my $last_key = undef;
+            my $found = 1;
+
+            foreach my $step (@full_path) {
+                if ($current->{children} && $current->{children}->{$step}) {
+                    $parent = $current;
+                    $last_key = $step;
+                    $current = $current->{children}->{$step};
+                } else {
+                    $found = 0;
+                    last;
+                }
+            }
+
+            if ($found && $parent && $last_key) {
+                delete $parent->{children}->{$last_key};
+                $modified = 1;
+            }
+        }
+
+        if ($modified) {
+            cfs_write_file("user.cfg", $usercfg);
+        }
+    };
+
+    lock_user_config($delSDNResourceFn, "SDN ACL cleanup failed");
+}
+
 sub remove_vm_access {
     my ($vmid) = @_;
     my $delVMaccessFn = sub {
-- 
2.47.3