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Commit ec222544 authored by Varun Berry's avatar Varun Berry
Browse files

Hash ICC ID used in the notification tag for voicemail notifications. 

Bug: 186026746
Test: manual.
Change-Id: I6ed0f6b7d0f2c286eb2437a29b0913fd38bcc2af
parent 360d2eb8

java/com/android/dialer/app/calllog/LegacyVoicemailNotifier.java

+3 −1
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ import com.android.dialer.common.LogUtil; 
import com.android.dialer.location.GeoUtil;

import com.android.dialer.notification.DialerNotificationManager;

import com.android.dialer.notification.NotificationChannelManager;

import com.android.dialer.notification.VoicemailChannelUtils;

import com.android.dialer.phonenumberutil.PhoneNumberHelper;

import com.android.dialer.telecom.TelecomUtil;

import com.android.dialer.theme.base.ThemeComponent;
@@ -181,7 +182,8 @@ public final class LegacyVoicemailNotifier { 
    if (context.getSystemService(TelephonyManager.class).getPhoneCount() <= 1) {

      return NOTIFICATION_TAG;

    }

    return NOTIFICATION_TAG_PREFIX + phoneAccountHandle.getId();

    return NOTIFICATION_TAG_PREFIX

        + VoicemailChannelUtils.getHashedPhoneAccountId(phoneAccountHandle);

  }



  private LegacyVoicemailNotifier() {}

java/com/android/dialer/notification/VoicemailChannelUtils.java

+34 −2
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 


package com.android.dialer.notification;



import static java.nio.charset.StandardCharsets.UTF_8;



import android.Manifest.permission;

import android.annotation.TargetApi;

import android.app.NotificationChannel;
@@ -38,15 +40,35 @@ import android.util.ArraySet; 
import com.android.dialer.common.Assert;

import com.android.dialer.common.LogUtil;

import com.android.dialer.util.PermissionsUtil;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.ArrayList;

import java.util.List;

import java.util.Set;



/** Utilities for working with voicemail channels. */

@TargetApi(VERSION_CODES.O)

/* package */ final class VoicemailChannelUtils {

public final class VoicemailChannelUtils {

  @VisibleForTesting static final String GLOBAL_VOICEMAIL_CHANNEL_ID = "phone_voicemail";

  private static final String PER_ACCOUNT_VOICEMAIL_CHANNEL_ID_PREFIX = "phone_voicemail_account_";

  private static final char[] hexDigits = "0123456789abcdef".toCharArray();



  /**

   * Returns a String representation of the hashed value of the PhoneAccountHandle's id (the

   * Sim ICC ID).

   * In case it fails to hash the id it will return an empty string.

   */

  public static String getHashedPhoneAccountId(@NonNull PhoneAccountHandle handle) {

    byte[] handleBytes = handle.getId().getBytes(UTF_8);

    try {

      byte[] hashedBytes = MessageDigest.getInstance("SHA-256").digest(handleBytes);

      return byteArrayToHexString(hashedBytes);

    } catch (NoSuchAlgorithmException e) {

      LogUtil.e("VoicemailChannelUtils.getHashedPhoneAccountId",

          "NoSuchAlgorithmException throw! Returning empty string!");

      return "";

    }

  }



  @SuppressWarnings("MissingPermission") // isSingleSimDevice() returns true if no permission

  static Set<String> getAllChannelIds(@NonNull Context context) {
@@ -124,7 +146,17 @@ import java.util.Set; 


  private static String getChannelIdForAccount(@NonNull PhoneAccountHandle handle) {

    Assert.isNotNull(handle);

    return PER_ACCOUNT_VOICEMAIL_CHANNEL_ID_PREFIX + ":" + handle.getId();

    return PER_ACCOUNT_VOICEMAIL_CHANNEL_ID_PREFIX

        + ":"

        + getHashedPhoneAccountId(handle);

  }



  private static String byteArrayToHexString(byte[] bytes) {

    StringBuilder sb = new StringBuilder(2 * bytes.length);

    for (byte b : bytes) {

      sb.append(hexDigits[(b >> 4) & 0xf]).append(hexDigits[b & 0xf]);

    }

    return sb.toString();

  }



  /**