Identify MMI codes specific to some OEM devices via hard-coding.

Bug: 72162360
Test: SpecialCharSequenceMgrTest, TranssionUtilsTest
PiperOrigin-RevId: 189825957
Change-Id: Ia161ad47c4122d33c108b545540707bb18076464

1 files changed, 73 insertions, 0 deletions

diff --git a/java/com/android/dialer/oem/TranssionUtils.java b/java/com/android/dialer/oem/TranssionUtils.java
new file mode 100644
index 000000000..a0d3f2df6
--- /dev/null
+++ b/java/com/android/dialer/oem/TranssionUtils.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2018 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.dialer.oem;
+
+import android.content.Context;
+import android.os.Build;
+import android.support.annotation.VisibleForTesting;
+import com.android.dialer.common.Assert;
+import com.android.dialer.compat.telephony.TelephonyManagerCompat;
+import com.google.common.collect.ImmutableSet;
+
+/** Utilities for Transsion devices. */
+public final class TranssionUtils {
+
+  @VisibleForTesting
+  public static final ImmutableSet<String> TRANSSION_DEVICE_MANUFACTURERS =
+      ImmutableSet.of("INFINIX MOBILITY LIMITED", "itel", "TECNO");
+
+  @VisibleForTesting
+  public static final ImmutableSet<String> TRANSSION_SECRET_CODES =
+      ImmutableSet.of("*#07#", "*#87#", "*#43#", "*#2727#", "*#88#");
+
+  private TranssionUtils() {}
+
+  /**
+   * Returns true if
+   *
+   * <ul>
+   *   <li>the device is a Transsion device, AND
+   *   <li>the input is a secret code for Transsion devices.
+   * </ul>
+   */
+  public static boolean isTranssionSecretCode(String input) {
+    return TRANSSION_DEVICE_MANUFACTURERS.contains(Build.MANUFACTURER)
+        && TRANSSION_SECRET_CODES.contains(input);
+  }
+
+  /**
+   * Handle a Transsion secret code by passing it to {@link
+   * TelephonyManagerCompat#handleSecretCode(Context, String)}.
+   *
+   * <p>Before calling this method, we must use {@link #isTranssionSecretCode(String)} to ensure the
+   * device is a Transsion device and the input is a valid Transsion secret code.
+   *
+   * <p>An exception will be thrown if either of the conditions above is not met.
+   */
+  public static void handleTranssionSecretCode(Context context, String input) {
+    Assert.checkState(isTranssionSecretCode(input));
+
+    TelephonyManagerCompat.handleSecretCode(context, getDigitsFromSecretCode(input));
+  }
+
+  private static String getDigitsFromSecretCode(String input) {
+    // We assume a valid secret code is of format "*#{[0-9]+}#".
+    Assert.checkArgument(input.length() > 3 && input.startsWith("*#") && input.endsWith("#"));
+
+    return input.substring(2, input.length() - 1);
+  }
+}