content: /*
   * Copyright (C) 2015 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.internal.widget;
  
  import android.os.Parcel;
  import android.os.Parcelable;
  import android.service.gatekeeper.GateKeeperResponse;
  import android.util.Slog;
  
  /**
   * Response object for a ILockSettings credential verification request.
   * @hide
   */
  public final class VerifyCredentialResponse implements Parcelable {
  
      public static final int RESPONSE_ERROR = -1;
      public static final int RESPONSE_OK = 0;
      public static final int RESPONSE_RETRY = 1;
  
      public static final VerifyCredentialResponse OK = new VerifyCredentialResponse();
      public static final VerifyCredentialResponse ERROR
              = new VerifyCredentialResponse(RESPONSE_ERROR, 0, null);
      private static final String TAG = "VerifyCredentialResponse";
  
      private int mResponseCode;
      private byte[] mPayload;
      private int mTimeout;
  
      public static final Parcelable.Creator<VerifyCredentialResponse> CREATOR
              = new Parcelable.Creator<VerifyCredentialResponse>() {
          @Override
          public VerifyCredentialResponse createFromParcel(Parcel source) {
              int responseCode = source.readInt();
              VerifyCredentialResponse response = new VerifyCredentialResponse(responseCode, 0, null);
              if (responseCode == RESPONSE_RETRY) {
                  response.setTimeout(source.readInt());
              } else if (responseCode == RESPONSE_OK) {
                  int size = source.readInt();
                  if (size > 0) {
                      byte[] payload = new byte[size];
                      source.readByteArray(payload);
                      response.setPayload(payload);
                  }
              }
              return response;
          }
  
          @Override
          public VerifyCredentialResponse[] newArray(int size) {
              return new VerifyCredentialResponse[size];
          }
  
      };
  
      public VerifyCredentialResponse() {
          mResponseCode = RESPONSE_OK;
          mPayload = null;
      }
  
  
      public VerifyCredentialResponse(byte[] payload) {
          mPayload = payload;
          mResponseCode = RESPONSE_OK;
      }
  
      public VerifyCredentialResponse(int timeout) {
          mTimeout = timeout;
          mResponseCode = RESPONSE_RETRY;
          mPayload = null;
      }
  
      private VerifyCredentialResponse(int responseCode, int timeout, byte[] payload) {
          mResponseCode = responseCode;
          mTimeout = timeout;
          mPayload = payload;
      }
  
      @Override
      public void writeToParcel(Parcel dest, int flags) {
          dest.writeInt(mResponseCode);
          if (mResponseCode == RESPONSE_RETRY) {
              dest.writeInt(mTimeout);
          } else if (mResponseCode == RESPONSE_OK) {
              if (mPayload != null) {
                  dest.writeInt(mPayload.length);
                  dest.writeByteArray(mPayload);
              } else {
                  dest.writeInt(0);
              }
          }
      }
  
      @Override
      public int describeContents() {
          return 0;
      }
  
      public byte[] getPayload() {
          return mPayload;
      }
  
      public int getTimeout() {
          return mTimeout;
      }
  
      public int getResponseCode() {
          return mResponseCode;
      }
  
      private void setTimeout(int timeout) {
          mTimeout = timeout;
      }
  
      private void setPayload(byte[] payload) {
          mPayload = payload;
      }
  
      public VerifyCredentialResponse stripPayload() {
          return new VerifyCredentialResponse(mResponseCode, mTimeout, new byte[0]);
      }
  
      public static VerifyCredentialResponse fromGateKeeperResponse(
              GateKeeperResponse gateKeeperResponse) {
          VerifyCredentialResponse response;
          int responseCode = gateKeeperResponse.getResponseCode();
          if (responseCode == GateKeeperResponse.RESPONSE_RETRY) {
              response = new VerifyCredentialResponse(gateKeeperResponse.getTimeout());
          } else if (responseCode == GateKeeperResponse.RESPONSE_OK) {
              byte[] token = gateKeeperResponse.getPayload();
              if (token == null) {
                  // something's wrong if there's no payload with a challenge
                  Slog.e(TAG, "verifyChallenge response had no associated payload");
                  response = VerifyCredentialResponse.ERROR;
              } else {
                  response = new VerifyCredentialResponse(token);
              }
          } else {
              response = VerifyCredentialResponse.ERROR;
          }
          return response;
      }
  }
  