1 files changed, 71 insertions, 0 deletions
diff --git a/packages/BackupEncryption/src/com/android/server/backup/encryption/tasks/ClearCryptoStateTask.java b/packages/BackupEncryption/src/com/android/server/backup/encryption/tasks/ClearCryptoStateTask.java
new file mode 100644
index 000000000000..8f35db69f11e
--- /dev/null
+++ b/packages/BackupEncryption/src/com/android/server/backup/encryption/tasks/ClearCryptoStateTask.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2019 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.server.backup.encryption.tasks;
+
+import android.content.Context;
+import android.util.Slog;
+
+import com.android.server.backup.encryption.CryptoSettings;
+import com.android.server.backup.encryption.chunking.ProtoStore;
+import com.android.server.backup.encryption.storage.BackupEncryptionDb;
+import com.android.server.backup.encryption.storage.EncryptionDbException;
+
+import java.io.IOException;
+
+/**
+ * Task to clear local crypto state.
+ *
+ * <p>Needs to run whenever the user changes their backup account.
+ */
+public class ClearCryptoStateTask {
+    private static final String TAG = "ClearCryptoStateTask";
+
+    private final Context mContext;
+    private final CryptoSettings mCryptoSettings;
+
+    /**
+     * A new instance.
+     *
+     * @param context for finding local storage.
+     * @param cryptoSettings to clear
+     */
+    public ClearCryptoStateTask(Context context, CryptoSettings cryptoSettings) {
+        mContext = context;
+        mCryptoSettings = cryptoSettings;
+    }
+
+    /** Deletes all local state for backup (not restore). */
+    public void run() {
+        Slog.d(TAG, "Clearing local crypto state.");
+        try {
+            BackupEncryptionDb.newInstance(mContext).clear();
+        } catch (EncryptionDbException e) {
+            Slog.e(TAG, "Error clearing encryption database", e);
+        }
+        mCryptoSettings.clearAllSettingsForBackup();
+        try {
+            ProtoStore.createChunkListingStore(mContext).deleteAllProtos();
+        } catch (IOException e) {
+            Slog.e(TAG, "Error clearing chunk listing store", e);
+        }
+        try {
+            ProtoStore.createKeyValueListingStore(mContext).deleteAllProtos();
+        } catch (IOException e) {
+            Slog.e(TAG, "Error clearing key-value store", e);
+        }
+    }
+}