1 files changed, 118 insertions, 0 deletions
diff --git a/java/com/android/incallui/answer/impl/hint/EventPayloadLoaderImpl.java b/java/com/android/incallui/answer/impl/hint/EventPayloadLoaderImpl.java
new file mode 100644
index 000000000..bd8d73645
--- /dev/null
+++ b/java/com/android/incallui/answer/impl/hint/EventPayloadLoaderImpl.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2016 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.incallui.answer.impl.hint;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.graphics.BitmapFactory;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.os.Build.VERSION_CODES;
+import android.preference.PreferenceManager;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.annotation.VisibleForTesting;
+import com.android.dialer.common.Assert;
+import com.android.dialer.common.ConfigProvider;
+import com.android.dialer.common.ConfigProviderBindings;
+import com.android.dialer.common.LogUtil;
+import java.io.InputStream;
+import java.util.TimeZone;
+import javax.crypto.Cipher;
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
+
+/** Decrypt the event payload to be shown if in a specific time range and the key is received. */
+@TargetApi(VERSION_CODES.M)
+public final class EventPayloadLoaderImpl implements EventPayloadLoader {
+
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  static final String CONFIG_EVENT_KEY = "event_key";
+
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  static final String CONFIG_EVENT_BINARY = "event_binary";
+
+  // Time is stored as a UTC UNIX timestamp in milliseconds, but interpreted as local time.
+  // For example, 946684800 (2000/1/1 00:00:00 @UTC) is the new year midnight at every timezone.
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  static final String CONFIG_EVENT_START_UTC_AS_LOCAL_MILLIS = "event_time_start_millis";
+
+  @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+  static final String CONFIG_EVENT_TIME_END_UTC_AS_LOCAL_MILLIS = "event_time_end_millis";
+
+  @Override
+  @Nullable
+  public Drawable loadPayload(
+      @NonNull Context context, long currentTimeUtcMillis, @NonNull TimeZone timeZone) {
+    Assert.isNotNull(context);
+    Assert.isNotNull(timeZone);
+    ConfigProvider configProvider = ConfigProviderBindings.get(context);
+
+    String pbeKey = configProvider.getString(CONFIG_EVENT_KEY, null);
+    if (pbeKey == null) {
+      return null;
+    }
+    long timeRangeStart = configProvider.getLong(CONFIG_EVENT_START_UTC_AS_LOCAL_MILLIS, 0);
+    long timeRangeEnd = configProvider.getLong(CONFIG_EVENT_TIME_END_UTC_AS_LOCAL_MILLIS, 0);
+
+    String eventBinary = configProvider.getString(CONFIG_EVENT_BINARY, null);
+    if (eventBinary == null) {
+      return null;
+    }
+
+    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
+    if (!preferences.getBoolean(
+        EventSecretCodeListener.EVENT_ENABLED_WITH_SECRET_CODE_KEY, false)) {
+      long localTimestamp = currentTimeUtcMillis + timeZone.getRawOffset();
+
+      if (localTimestamp < timeRangeStart) {
+        return null;
+      }
+
+      if (localTimestamp > timeRangeEnd) {
+        return null;
+      }
+    }
+
+    // Use openssl aes-128-cbc -in <input> -out <output> -pass <PBEKey> to generate the asset
+    try (InputStream input = context.getAssets().open(eventBinary)) {
+      byte[] encryptedFile = new byte[input.available()];
+      input.read(encryptedFile);
+
+      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding", "BC");
+
+      byte[] salt = new byte[8];
+      System.arraycopy(encryptedFile, 8, salt, 0, 8);
+      SecretKey key =
+          SecretKeyFactory.getInstance("PBEWITHMD5AND128BITAES-CBC-OPENSSL", "BC")
+              .generateSecret(new PBEKeySpec(pbeKey.toCharArray(), salt, 100));
+      cipher.init(Cipher.DECRYPT_MODE, key);
+
+      byte[] decryptedFile = cipher.doFinal(encryptedFile, 16, encryptedFile.length - 16);
+
+      return new BitmapDrawable(
+          context.getResources(),
+          BitmapFactory.decodeByteArray(decryptedFile, 0, decryptedFile.length));
+    } catch (Exception e) {
+      // Avoid crashing dialer for any reason.
+      LogUtil.e("EventPayloadLoader.loadPayload", "error decrypting payload:", e);
+      return null;
+    }
+  }
+}