content: /*
   * Copyright (C) 2012 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 android.telephony;
  
  import android.os.Build;
  import android.text.TextUtils;
  import android.util.Log;
  
  import android.annotation.UnsupportedAppUsage;
  import android.util.Base64;
  
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  
  
  /**
   * A class to log strings to the RADIO LOG.
   *
   * @hide
   */
  public final class Rlog {
  
      private static final boolean USER_BUILD = Build.IS_USER;
  
      private Rlog() {
      }
  
      @UnsupportedAppUsage
      public static int v(String tag, String msg) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.VERBOSE, tag, msg);
      }
  
      public static int v(String tag, String msg, Throwable tr) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.VERBOSE, tag,
                  msg + '\n' + Log.getStackTraceString(tr));
      }
  
      @UnsupportedAppUsage
      public static int d(String tag, String msg) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.DEBUG, tag, msg);
      }
  
      @UnsupportedAppUsage
      public static int d(String tag, String msg, Throwable tr) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.DEBUG, tag,
                  msg + '\n' + Log.getStackTraceString(tr));
      }
  
      @UnsupportedAppUsage
      public static int i(String tag, String msg) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.INFO, tag, msg);
      }
  
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      public static int i(String tag, String msg, Throwable tr) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.INFO, tag,
                  msg + '\n' + Log.getStackTraceString(tr));
      }
  
      @UnsupportedAppUsage
      public static int w(String tag, String msg) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.WARN, tag, msg);
      }
  
      @UnsupportedAppUsage
      public static int w(String tag, String msg, Throwable tr) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.WARN, tag,
                  msg + '\n' + Log.getStackTraceString(tr));
      }
  
      public static int w(String tag, Throwable tr) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.WARN, tag, Log.getStackTraceString(tr));
      }
  
      @UnsupportedAppUsage
      public static int e(String tag, String msg) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.ERROR, tag, msg);
      }
  
      @UnsupportedAppUsage
      public static int e(String tag, String msg, Throwable tr) {
          return Log.println_native(Log.LOG_ID_RADIO, Log.ERROR, tag,
                  msg + '\n' + Log.getStackTraceString(tr));
      }
  
      public static int println(int priority, String tag, String msg) {
          return Log.println_native(Log.LOG_ID_RADIO, priority, tag, msg);
      }
  
      public static boolean isLoggable(String tag, int level) {
          return Log.isLoggable(tag, level);
      }
  
      /**
       * Redact personally identifiable information for production users.
       * @param tag used to identify the source of a log message
       * @param pii the personally identifiable information we want to apply secure hash on.
       * @return If tag is loggable in verbose mode or pii is null, return the original input.
       * otherwise return a secure Hash of input pii
       */
      public static String pii(String tag, Object pii) {
          String val = String.valueOf(pii);
          if (pii == null || TextUtils.isEmpty(val) || isLoggable(tag, Log.VERBOSE)) {
              return val;
          }
          return "[" + secureHash(val.getBytes()) + "]";
      }
  
      /**
       * Redact personally identifiable information for production users.
       * @param enablePiiLogging set when caller explicitly want to enable sensitive logging.
       * @param pii the personally identifiable information we want to apply secure hash on.
       * @return If enablePiiLogging is set to true or pii is null, return the original input.
       * otherwise return a secure Hash of input pii
       */
      public static String pii(boolean enablePiiLogging, Object pii) {
          String val = String.valueOf(pii);
          if (pii == null || TextUtils.isEmpty(val) || enablePiiLogging) {
              return val;
          }
          return "[" + secureHash(val.getBytes()) + "]";
      }
  
      /**
       * Returns a secure hash (using the SHA1 algorithm) of the provided input.
       *
       * @return "****" if the build type is user, otherwise the hash
       * @param input the bytes for which the secure hash should be computed.
       */
      private static String secureHash(byte[] input) {
          // Refrain from logging user personal information in user build.
          if (USER_BUILD) {
              return "****";
          }
  
          MessageDigest messageDigest;
  
          try {
              messageDigest = MessageDigest.getInstance("SHA-1");
          } catch (NoSuchAlgorithmException e) {
              return "####";
          }
  
          byte[] result = messageDigest.digest(input);
          return Base64.encodeToString(
                  result, Base64.URL_SAFE | Base64.NO_PADDING | Base64.NO_WRAP);
      }
  }
  
  