Ensure only one approved NAS

Bug: 186565970
Test: atest NotificationAssistantsTest
Change-Id: I72ef874bd215396de068d0d989d4d7491848c8c5

services/core/java/com/android/server/notification/NotificationManagerService.java

@@ -9473,6 +9473,19 @@ public class NotificationManagerService extends SystemService {
             }
         }
 
+        @Override
+        protected void addApprovedList(String approved, int userId, boolean isPrimary,
+                String userSet) {
+            if (!TextUtils.isEmpty(approved)) {
+                String[] approvedArray = approved.split(ENABLED_SERVICES_SEPARATOR);
+                if (approvedArray.length > 1) {
+                    Slog.d(TAG, "More than one approved assistants");
+                    approved = approvedArray[0];
+                }
+            }
+            super.addApprovedList(approved, userId, isPrimary, userSet);
+        }
+
         public NotificationAssistants(Context context, Object lock, UserProfiles up,
                 IPackageManager pm) {
             super(context, lock, up, pm);

services/tests/uiservicestests/src/com/android/server/notification/NotificationAssistantsTest.java

@@ -177,6 +177,25 @@ public class NotificationAssistantsTest extends UiServiceTestCase {
         assertTrue(mAssistants.mIsUserChanged.get(0));
     }
 
+    @Test
+    public void testReadXml_multiApproved() throws Exception {
+        String xml = "<enabled_assistants version=\"4\" defaults=\"b/b\">"
+                + "<service_listing approved=\"a/a:b/b\" user=\"0\" primary=\"true\""
+                + "user_changed=\"true\"/>"
+                + "</enabled_assistants>";
+
+        final TypedXmlPullParser parser = Xml.newFastPullParser();
+        parser.setInput(new BufferedInputStream(
+                new ByteArrayInputStream(xml.toString().getBytes())), null);
+
+        parser.nextTag();
+        mAssistants.readXml(parser, null, false, UserHandle.USER_ALL);
+
+        assertEquals(1, mAssistants.getAllowedComponents(0).size());
+        assertEquals(new ArrayList(Arrays.asList(new ComponentName("a", "a"))),
+                mAssistants.getAllowedComponents(0));
+    }
+
     @Test
     public void testXmlUpgradeExistingApprovedComponents() throws Exception {
         String xml = "<enabled_assistants version=\"2\" defaults=\"b\\b\">"