feat: implement getAuthStatus for screen

Author: codebytere

README.md

@@ -18,12 +18,13 @@ This native Node.js module allows you to manage an app's access to:
 * Microphone
 * Accessibility
 * Location
+* Screen Capture
 
 ## API
 
 ## `permissions.getAuthStatus(type)`
 
-* `type` String - The type of system component to which you are requesting access. Can be one of `accessibility`, `calendar`, `camera`, `contacts`, `full-disk-access`, `location`, `microphone`, `photos`, or `reminders`.
+* `type` String - The type of system component to which you are requesting access. Can be one of `accessibility`, `calendar`, `camera`, `contacts`, `full-disk-access`, `location`, `microphone`, `photos`, `screen`, or `reminders`.
 
 Returns `String` - Can be one of `not determined`, `denied`, `authorized`, or `restricted`.
 

index.js

@@ -9,7 +9,8 @@ function getAuthStatus(type) {
     'camera',
     'microphone',
     'accessibility',
-    'location'
+    'location',
+    'screen'
   ]
 
   if (!validTypes.includes(type)) {

permissions.mm

@@ -100,6 +100,36 @@
   return auth_status;
 }
 
+// Returns a status indicating whether the user has authorized
+// Screen Recording access
+std::string ScreenAuthStatus() {
+  std::string auth_status = "not determined";
+
+  // Screen Capture is considered allowed if the name of at least one normal
+  // or dock window running on another process is visible.
+  if (@available(macOS 10.15, *)) {
+    CFArrayRef window_list = CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
+    int num_windows = (int)CFArrayGetCount(window_list);
+    int num_named_windows = 0;
+    for (int idx = 0; idx < num_windows; idx++) {
+      NSDictionary* info = (NSDictionary*)CFArrayGetValueAtIndex(window_list, idx);
+      NSString* window_name = info[(id)kCGWindowName];
+      if (window_name) {
+        num_named_windows++;
+      } else {
+        break;
+      }
+    }
+
+    CFRelease(window_list);
+    auth_status = (num_windows == num_named_windows) ? "authorized" : "denied";
+  } else {
+    auth_status = "authorized";
+  }
+
+  return auth_status;
+}
+
 // Returns a status indicating whether the user has authorized
 // Camera/Microphone access
 std::string MediaAuthStatus(const std::string &type) {
@@ -165,6 +195,8 @@
     auth_status = AXIsProcessTrusted() ? "authorized" : "denied";
   } else if (type == "location") {
     auth_status = LocationAuthStatus();
+  } else if (type == "screen") {
+    auth_status = ScreenAuthStatus();
   }
 
   return Napi::Value::From(env, auth_status);

test/module.spec.js

@@ -21,7 +21,8 @@ describe('node-mac-permissions', () => {
         'camera',
         'microphone',
         'accessibility',
-        'location'
+        'location',
+        'screen'
       ]
 
       const statuses = ['not determined', 'denied', 'authorized', 'restricted']