Enable the clear credentials buttons when wifi keys are installed.

This patch updates the ResetCredentialsPreferenceController to check the
WIFI keystore namespace if called by the primary user.

Test: Install a WIFI certificate or key and watch the
      "Clear credentials" button become enabled in the credential
      storage dialog of Settings.
Bug: 189601008
Merged-In: I69828b64a7e3c707c27b4582d64ff0ddb863a4ff
Change-Id: I69828b64a7e3c707c27b4582d64ff0ddb863a4ff

src/com/android/settings/security/ResetCredentialsPreferenceController.java

@@ -18,6 +18,8 @@ package com.android.settings.security;
 
 import android.content.Context;
 import android.os.UserManager;
+import android.security.keystore.KeyProperties;
+import android.security.keystore2.AndroidKeyStoreLoadStoreParameter;
 
 import androidx.preference.PreferenceScreen;
 
@@ -35,6 +37,7 @@ public class ResetCredentialsPreferenceController extends RestrictedEncryptionPr
     private static final String KEY_RESET_CREDENTIALS = "credentials_reset";
 
     private final KeyStore mKeyStore;
+    private final KeyStore mWifiKeyStore;
 
     private RestrictedPreference mPreference;
 
@@ -45,8 +48,19 @@ public class ResetCredentialsPreferenceController extends RestrictedEncryptionPr
             keyStore = KeyStore.getInstance("AndroidKeyStore");
             keyStore.load(null);
         } catch (Exception e) {
+            keyStore = null;
         }
         mKeyStore = keyStore;
+        keyStore = null;
+        if (context.getUser().isSystem()) {
+            try {
+                keyStore = KeyStore.getInstance("AndroidKeyStore");
+                keyStore.load(new AndroidKeyStoreLoadStoreParameter(KeyProperties.NAMESPACE_WIFI));
+            } catch (Exception e) {
+                keyStore = null;
+            }
+        }
+        mWifiKeyStore = keyStore;
         if (lifecycle != null) {
             lifecycle.addObserver(this);
         }
@@ -68,9 +82,11 @@ public class ResetCredentialsPreferenceController extends RestrictedEncryptionPr
         if (mPreference != null && !mPreference.isDisabledByAdmin()) {
             boolean isEnabled = false;
             try {
-                if (mKeyStore != null) {
+                isEnabled = (mKeyStore != null
-                    isEnabled = mKeyStore.aliases().hasMoreElements();
+                        && mKeyStore.aliases().hasMoreElements())
-                }
+                        || (mWifiKeyStore != null
+                        && mWifiKeyStore.aliases().hasMoreElements());
+
             } catch (KeyStoreException e) {
                 // If access to keystore fails, treat as disabled.
             }