Refer to the last Hotspot password when generating the password

- Query the last Hotspot password when security type is SECURITY_TYPE_OPEN and it will be used when the user changes to another security type

- If the last hotspot password is an empty string, then generate random password

Bug: 201789473
Test: manual test
atest -c WifiHotspotRepositoryTest
make RunSettingsRoboTests ROBOTEST_FILTER=WifiTetherPasswordPreferenceControllerTest

Change-Id: Id3a846099238433e7b6c8b934fa26a74df0dcb61

tests/unit/src/com/android/settings/testutils/FakeFeatureFactory.java

@@ -48,6 +48,7 @@ import com.android.settings.slices.SlicesFeatureProvider;
 import com.android.settings.users.UserFeatureProvider;
 import com.android.settings.vpn2.AdvancedVpnFeatureProvider;
 import com.android.settings.wifi.WifiTrackerLibProvider;
+import com.android.settings.wifi.factory.WifiFeatureProvider;
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 
 /**
@@ -86,6 +87,7 @@ public class FakeFeatureFactory extends FeatureFactory {
     public AccessibilitySearchFeatureProvider mAccessibilitySearchFeatureProvider;
     public AccessibilityMetricsFeatureProvider mAccessibilityMetricsFeatureProvider;
     public AdvancedVpnFeatureProvider mAdvancedVpnFeatureProvider;
+    public WifiFeatureProvider mWifiFeatureProvider;
 
     /**
      * Call this in {@code @Before} method of the test class to use fake factory.
@@ -128,6 +130,7 @@ public class FakeFeatureFactory extends FeatureFactory {
         mAccessibilitySearchFeatureProvider = mock(AccessibilitySearchFeatureProvider.class);
         mAccessibilityMetricsFeatureProvider = mock(AccessibilityMetricsFeatureProvider.class);
         mAdvancedVpnFeatureProvider = mock(AdvancedVpnFeatureProvider.class);
+        mWifiFeatureProvider = mock(WifiFeatureProvider.class);
     }
 
     @Override
@@ -274,4 +277,9 @@ public class FakeFeatureFactory extends FeatureFactory {
     public AdvancedVpnFeatureProvider getAdvancedVpnFeatureProvider() {
         return mAdvancedVpnFeatureProvider;
     }
+
+    @Override
+    public WifiFeatureProvider getWifiFeatureProvider() {
+        return mWifiFeatureProvider;
+    }
 }

tests/unit/src/com/android/settings/wifi/repository/WifiHotspotRepositoryTest.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.wifi.repository;
+
+import static android.net.wifi.SoftApConfiguration.SECURITY_TYPE_OPEN;
+import static android.net.wifi.SoftApConfiguration.SECURITY_TYPE_WPA3_SAE;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.net.wifi.SoftApConfiguration;
+import android.net.wifi.WifiManager;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+
+@RunWith(AndroidJUnit4.class)
+public class WifiHotspotRepositoryTest {
+    static final String WIFI_SSID = "wifi_ssid";
+    static final String WIFI_PASSWORD = "wifi_password";
+
+    @Rule
+    public final MockitoRule mMockitoRule = MockitoJUnit.rule();
+    @Spy
+    Context mContext = ApplicationProvider.getApplicationContext();
+    @Mock
+    WifiManager mWifiManager;
+
+    WifiHotspotRepository mWifiHotspotRepository;
+    SoftApConfiguration mSoftApConfiguration;
+
+    @Before
+    public void setUp() {
+        mWifiHotspotRepository = new WifiHotspotRepository(mContext, mWifiManager);
+    }
+
+    @Test
+    public void queryLastPasswordIfNeeded_securityTypeIsOpen_queryLastPassword() {
+        mSoftApConfiguration = new SoftApConfiguration.Builder()
+                .setSsid(WIFI_SSID)
+                .setPassphrase(null, SECURITY_TYPE_OPEN)
+                .build();
+        when(mWifiManager.getSoftApConfiguration()).thenReturn(mSoftApConfiguration);
+
+        mWifiHotspotRepository.queryLastPasswordIfNeeded();
+
+        verify(mWifiManager).queryLastConfiguredTetheredApPassphraseSinceBoot(any(), any());
+    }
+
+    @Test
+    public void queryLastPasswordIfNeeded_securityTypeIsNotOpen_notQueryLastPassword() {
+        mSoftApConfiguration = new SoftApConfiguration.Builder()
+                .setSsid(WIFI_SSID)
+                .setPassphrase(WIFI_PASSWORD, SECURITY_TYPE_WPA3_SAE)
+                .build();
+        when(mWifiManager.getSoftApConfiguration()).thenReturn(mSoftApConfiguration);
+
+        mWifiHotspotRepository.queryLastPasswordIfNeeded();
+
+        verify(mWifiManager, never())
+                .queryLastConfiguredTetheredApPassphraseSinceBoot(any(), any());
+    }
+
+    @Test
+    public void generatePassword_haveLastPassword_returnLastPassword() {
+        mWifiHotspotRepository.mLastPassword = WIFI_PASSWORD;
+
+        assertThat(mWifiHotspotRepository.generatePassword()).isEqualTo(WIFI_PASSWORD);
+    }
+
+    @Test
+    public void generatePassword_noLastPassword_returnRandomPassword() {
+        mWifiHotspotRepository.mLastPassword = "";
+
+        String password = mWifiHotspotRepository.generatePassword();
+
+        assertThat(password).isNotEqualTo(WIFI_PASSWORD);
+        assertThat(password.length()).isNotEqualTo(0);
+    }
+}