fix: allow logon screen password, on lock screen (#11566)

Signed-off-by: fufesou <linlong1266@gmail.com>

src/platform/macos.rs

@@ -491,6 +491,38 @@ pub fn is_prelogin() -> bool {
     get_active_userid() == "0"
 }
 
+// https://stackoverflow.com/questions/11505255/osx-check-if-the-screen-is-locked
+// No "CGSSessionScreenIsLocked" can be found when macOS is not locked.
+//
+// `ioreg -n Root -d1` returns `"CGSSessionScreenIsLocked"=Yes`
+// `ioreg -n Root -d1 -a` returns
+// ```
+// ...
+//    <key>CGSSessionScreenIsLocked</key>
+//    <true/>
+// ...
+// ```
+pub fn is_locked() -> bool {
+    match std::process::Command::new("ioreg")
+        .arg("-n")
+        .arg("Root")
+        .arg("-d1")
+        .output()
+    {
+        Ok(output) => {
+            let output_str = String::from_utf8_lossy(&output.stdout);
+            // Although `"CGSSessionScreenIsLocked"=Yes` was printed on my macOS,
+            // I also check `"CGSSessionScreenIsLocked"=true` for better compability.
+            output_str.contains("\"CGSSessionScreenIsLocked\"=Yes")
+                || output_str.contains("\"CGSSessionScreenIsLocked\"=true")
+        }
+        Err(e) => {
+            log::error!("Failed to query ioreg for the lock state: {}", e);
+            false
+        }
+    }
+}
+
 pub fn is_root() -> bool {
     crate::username() == "root"
 }