Adds a JNI functionality to Create, Lock and Unlock a wallet

android/java/org/chromium/chrome/browser/crypto_wallet/BraveWalletNativeWorker.java

@@ -0,0 +1,80 @@
+/* Copyright (c) 2021 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.chromium.chrome.browser.crypto_wallet;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.base.annotations.NativeMethods;
+
+@JNINamespace("chrome::android")
+public class BraveWalletNativeWorker {
+    private long mNativeBraveWalletNativeWorker;
+    private static final Object lock = new Object();
+    private static BraveWalletNativeWorker instance;
+
+    public static BraveWalletNativeWorker getInstance() {
+        synchronized (lock) {
+            if (instance == null) {
+                instance = new BraveWalletNativeWorker();
+                instance.Init();
+            }
+        }
+        return instance;
+    }
+
+    private BraveWalletNativeWorker() {
+    }
+
+    private void Init() {
+        if (mNativeBraveWalletNativeWorker == 0) {
+            BraveWalletNativeWorkerJni.get().init(this);
+        }
+    }
+
+    @Override
+    protected void finalize() {
+        Destroy();
+    }
+
+    private void Destroy() {
+        if (mNativeBraveWalletNativeWorker != 0) {
+            BraveWalletNativeWorkerJni.get().destroy(
+                mNativeBraveWalletNativeWorker, this);
+            mNativeBraveWalletNativeWorker = 0;
+        }
+    }
+
+    @CalledByNative
+    private void setNativePtr(long nativePtr) {
+        assert mNativeBraveWalletNativeWorker == 0;
+        mNativeBraveWalletNativeWorker = nativePtr;
+    }
+
+    public String CreateWallet(String password) {
+        return BraveWalletNativeWorkerJni.get().createWallet(
+            mNativeBraveWalletNativeWorker, password);
+    }
+
+    public void LockWallet() {
+        BraveWalletNativeWorkerJni.get().lockWallet(
+            mNativeBraveWalletNativeWorker);
+    }
+
+    public void UnlockWallet(String password) {
+        BraveWalletNativeWorkerJni.get().unlockWallet(
+            mNativeBraveWalletNativeWorker, password);
+    }
+
+    @NativeMethods
+    interface Natives {
+        void init(BraveWalletNativeWorker caller);
+        void destroy(long nativeBraveWalletNativeWorker,
+            BraveWalletNativeWorker caller);
+        String createWallet(long nativeBraveWalletNativeWorker, String password);
+        void lockWallet(long nativeBraveWalletNativeWorker);
+        boolean unlockWallet(long nativeBraveWalletNativeWorker, String password);
+    }
+}

android/java/org/chromium/chrome/browser/crypto_wallet/CryptoWalletActivity.java

@@ -20,6 +20,7 @@ import androidx.viewpager.widget.ViewPager;
 import com.google.android.material.bottomnavigation.BottomNavigationView;
 
 import org.chromium.chrome.R;
+import org.chromium.chrome.browser.crypto_wallet.BraveWalletNativeWorker;
 import org.chromium.chrome.browser.crypto_wallet.adapters.WalletNavigationFragmentPageAdapter;
 import org.chromium.chrome.browser.crypto_wallet.fragments.CardsFragment;
 import org.chromium.chrome.browser.crypto_wallet.fragments.CryptoFragment;
@@ -102,6 +103,7 @@ public class CryptoWalletActivity extends AppCompatActivity {
             } else if (itemId == R.id.navigation_lock) {
                 viewPager.setCurrentItem(4);
                 initTitle(4);
+                BraveWalletNativeWorker.getInstance().LockWallet();
                 return true;
             }
             return false;

android/java/org/chromium/chrome/browser/crypto_wallet/fragments/CryptoFragment.java

@@ -34,6 +34,7 @@ import com.google.android.material.tabs.TabLayout;
 
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.crypto_wallet.AddAccountOnboardingDialog;
+import org.chromium.chrome.browser.crypto_wallet.BraveWalletNativeWorker;
 import org.chromium.chrome.browser.crypto_wallet.CryptoWalletActivity;
 import org.chromium.chrome.browser.crypto_wallet.adapters.RecoveryPhraseAdapter;
 import org.chromium.chrome.browser.crypto_wallet.util.ItemOffsetDecoration;
@@ -150,6 +151,9 @@ public class CryptoFragment extends Fragment {
         });
 
         recoveryPhraseButton.setOnClickListener(v -> {
+            // TODO(sergz): do something with a mnemonic string that CreateWallet returns
+            BraveWalletNativeWorker.getInstance().CreateWallet(
+                passwordEdittext.getText().toString());
             onFinishOnboarding.onFinish();
             showAddAccountDialog();
         });
@@ -221,8 +225,8 @@ public class CryptoFragment extends Fragment {
                     break;
                 case BiometricPrompt.BIOMETRIC_ERROR_NO_BIOMETRICS:
                     Toast.makeText(getActivity(), "User did not register any fingerprints.",
-                                 Toast.LENGTH_SHORT)
-                            .show();
+                                Toast.LENGTH_SHORT)
+                           .show();
                     break;
                 default:
                     Toast.makeText(getActivity(), "unrecoverable error", Toast.LENGTH_SHORT).show();