Allow configuring remote control permissions for different users (#13974)

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/common.rs

@@ -2277,6 +2277,28 @@ pub fn str2color(s: &str, alpha: u8) -> u32 {
     (alpha as u32) << 24 | rgb
 }
 
+/// Check control permission state from a u64 bitmap.
+/// Each permission uses 2 bits: 0 = not set, 1 = disable, 2 = enable, 3 = invalid (treated as not set)
+/// Returns: Some(true) = enabled, Some(false) = disabled, None = not set or invalid
+pub fn get_control_permission(
+    permissions: u64,
+    permission: hbb_common::rendezvous_proto::control_permissions::Permission,
+) -> Option<bool> {
+    use hbb_common::protobuf::Enum;
+    let index = permission.value();
+    if index >= 0 && index < 32 {
+        let shift = index * 2;
+        let value = (permissions >> shift) & 0b11;
+        match value {
+            1 => Some(false), // disable
+            2 => Some(true),  // enable
+            _ => None,        // 0 = not set, 3 = invalid
+        }
+    } else {
+        None
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;