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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.internal.widget;
     18 
     19 import android.os.Parcel;
     20 import android.os.Parcelable;
     21 import android.service.gatekeeper.GateKeeperResponse;
     22 import android.util.Slog;
     23 
     24 /**
     25  * Response object for a ILockSettings credential verification request.
     26  * @hide
     27  */
     28 public final class VerifyCredentialResponse implements Parcelable {
     29 
     30     public static final int RESPONSE_ERROR = -1;
     31     public static final int RESPONSE_OK = 0;
     32     public static final int RESPONSE_RETRY = 1;
     33 
     34     public static final VerifyCredentialResponse OK = new VerifyCredentialResponse();
     35     public static final VerifyCredentialResponse ERROR
     36             = new VerifyCredentialResponse(RESPONSE_ERROR, 0, null);
     37     private static final String TAG = "VerifyCredentialResponse";
     38 
     39     private int mResponseCode;
     40     private byte[] mPayload;
     41     private int mTimeout;
     42 
     43     public static final Parcelable.Creator<VerifyCredentialResponse> CREATOR
     44             = new Parcelable.Creator<VerifyCredentialResponse>() {
     45         @Override
     46         public VerifyCredentialResponse createFromParcel(Parcel source) {
     47             int responseCode = source.readInt();
     48             VerifyCredentialResponse response = new VerifyCredentialResponse(responseCode, 0, null);
     49             if (responseCode == RESPONSE_RETRY) {
     50                 response.setTimeout(source.readInt());
     51             } else if (responseCode == RESPONSE_OK) {
     52                 int size = source.readInt();
     53                 if (size > 0) {
     54                     byte[] payload = new byte[size];
     55                     source.readByteArray(payload);
     56                     response.setPayload(payload);
     57                 }
     58             }
     59             return response;
     60         }
     61 
     62         @Override
     63         public VerifyCredentialResponse[] newArray(int size) {
     64             return new VerifyCredentialResponse[size];
     65         }
     66 
     67     };
     68 
     69     public VerifyCredentialResponse() {
     70         mResponseCode = RESPONSE_OK;
     71         mPayload = null;
     72     }
     73 
     74 
     75     public VerifyCredentialResponse(byte[] payload) {
     76         mPayload = payload;
     77         mResponseCode = RESPONSE_OK;
     78     }
     79 
     80     public VerifyCredentialResponse(int timeout) {
     81         mTimeout = timeout;
     82         mResponseCode = RESPONSE_RETRY;
     83         mPayload = null;
     84     }
     85 
     86     private VerifyCredentialResponse(int responseCode, int timeout, byte[] payload) {
     87         mResponseCode = responseCode;
     88         mTimeout = timeout;
     89         mPayload = payload;
     90     }
     91 
     92     @Override
     93     public void writeToParcel(Parcel dest, int flags) {
     94         dest.writeInt(mResponseCode);
     95         if (mResponseCode == RESPONSE_RETRY) {
     96             dest.writeInt(mTimeout);
     97         } else if (mResponseCode == RESPONSE_OK) {
     98             if (mPayload != null) {
     99                 dest.writeInt(mPayload.length);
    100                 dest.writeByteArray(mPayload);
    101             } else {
    102                 dest.writeInt(0);
    103             }
    104         }
    105     }
    106 
    107     @Override
    108     public int describeContents() {
    109         return 0;
    110     }
    111 
    112     public byte[] getPayload() {
    113         return mPayload;
    114     }
    115 
    116     public int getTimeout() {
    117         return mTimeout;
    118     }
    119 
    120     public int getResponseCode() {
    121         return mResponseCode;
    122     }
    123 
    124     private void setTimeout(int timeout) {
    125         mTimeout = timeout;
    126     }
    127 
    128     private void setPayload(byte[] payload) {
    129         mPayload = payload;
    130     }
    131 
    132     public VerifyCredentialResponse stripPayload() {
    133         return new VerifyCredentialResponse(mResponseCode, mTimeout, new byte[0]);
    134     }
    135 
    136     public static VerifyCredentialResponse fromGateKeeperResponse(
    137             GateKeeperResponse gateKeeperResponse) {
    138         VerifyCredentialResponse response;
    139         int responseCode = gateKeeperResponse.getResponseCode();
    140         if (responseCode == GateKeeperResponse.RESPONSE_RETRY) {
    141             response = new VerifyCredentialResponse(gateKeeperResponse.getTimeout());
    142         } else if (responseCode == GateKeeperResponse.RESPONSE_OK) {
    143             byte[] token = gateKeeperResponse.getPayload();
    144             if (token == null) {
    145                 // something's wrong if there's no payload with a challenge
    146                 Slog.e(TAG, "verifyChallenge response had no associated payload");
    147                 response = VerifyCredentialResponse.ERROR;
    148             } else {
    149                 response = new VerifyCredentialResponse(token);
    150             }
    151         } else {
    152             response = VerifyCredentialResponse.ERROR;
    153         }
    154         return response;
    155     }
    156 }
    157