1 files changed, 99 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/BackupCodeDisplayFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/BackupCodeDisplayFragment.java
new file mode 100644
index 000000000..d1636525e
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/BackupCodeDisplayFragment.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.ui;
+
+
+import java.security.SecureRandom;
+import java.util.Random;
+
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.TextView;
+
+import org.sufficientlysecure.keychain.R;
+
+
+public class BackupCodeDisplayFragment extends Fragment {
+
+    public static final String ARG_BACKUP_CODE = "backup_code";
+
+    private String mBackupCode;
+
+    private TextView vBackupCode;
+    private Button vOkButton;
+
+    @Override
+    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.drawer_backup_fragment, container, false);
+
+        vBackupCode = (TextView) view.findViewById(R.id.backup_code);
+        vOkButton = (Button) view.findViewById(R.id.button_ok);
+
+        return view;
+    }
+
+    @Override
+    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        if (savedInstanceState == null) {
+            mBackupCode = generateRandomCode();
+        } else {
+            mBackupCode = savedInstanceState.getString(ARG_BACKUP_CODE);
+        }
+
+        vBackupCode.setText(mBackupCode);
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+
+        outState.putString(ARG_BACKUP_CODE, mBackupCode);
+    }
+
+    @NonNull
+    private static String generateRandomCode() {
+
+        Random r = new SecureRandom();
+
+        // simple generation of a 20 character backup code
+        StringBuilder code = new StringBuilder(24);
+        for (int i = 0; i < 20; i++) {
+            if ((i % 5) == 4) {
+                code.append('-');
+            }
+            code.append('a' + r.nextInt(26));
+        }
+
+        return code.toString();
+
+    }
+
+}