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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.nfc.cardemulation;
     18 
     19 import android.app.ActivityManager;
     20 import android.content.ComponentName;
     21 import android.content.Context;
     22 import android.nfc.cardemulation.NfcFServiceInfo;
     23 import android.util.Log;
     24 
     25 import java.io.FileDescriptor;
     26 import java.io.PrintWriter;
     27 import java.util.ArrayList;
     28 import java.util.Iterator;
     29 import java.util.List;
     30 import java.util.Map;
     31 import java.util.HashMap;
     32 
     33 public class RegisteredT3tIdentifiersCache {
     34     static final String TAG = "RegisteredT3tIdentifiersCache";
     35 
     36     static final boolean DBG = false;
     37 
     38     // All NFC-F services that have registered
     39     List<NfcFServiceInfo> mServices = new ArrayList<NfcFServiceInfo>();
     40 
     41     final HashMap<String, NfcFServiceInfo> mForegroundT3tIdentifiersCache =
     42             new HashMap<String, NfcFServiceInfo>();
     43 
     44     ComponentName mEnabledForegroundService;
     45 
     46     final class T3tIdentifier {
     47         public final String systemCode;
     48         public final String nfcid2;
     49         public final String t3tPmm;
     50 
     51         T3tIdentifier(String systemCode, String nfcid2, String t3tPmm) {
     52             this.systemCode = systemCode;
     53             this.nfcid2 = nfcid2;
     54             this.t3tPmm = t3tPmm;
     55         }
     56 
     57         @Override
     58         public boolean equals(Object o) {
     59             if (this == o) return true;
     60             if (o == null || getClass() != o.getClass()) return false;
     61 
     62             T3tIdentifier that = (T3tIdentifier) o;
     63             if (!systemCode.equalsIgnoreCase(that.systemCode)) return false;
     64             if (!nfcid2.equalsIgnoreCase(that.nfcid2)) return false;
     65 
     66             return true;
     67         }
     68 
     69         @Override
     70         public int hashCode() {
     71             int result = systemCode.hashCode();
     72             result = 31 * result + nfcid2.hashCode();
     73             return result;
     74         }
     75     }
     76 
     77     final Context mContext;
     78     final SystemCodeRoutingManager mRoutingManager;
     79 
     80     final Object mLock = new Object();
     81 
     82     boolean mNfcEnabled = false;
     83 
     84     public RegisteredT3tIdentifiersCache(Context context) {
     85         Log.d(TAG, "RegisteredT3tIdentifiersCache");
     86         mContext = context;
     87         mRoutingManager = new SystemCodeRoutingManager();
     88     }
     89 
     90     public NfcFServiceInfo resolveNfcid2(String nfcid2) {
     91         synchronized (mLock) {
     92             if (DBG) Log.d(TAG, "resolveNfcid2: resolving NFCID " + nfcid2);
     93             NfcFServiceInfo resolveInfo;
     94             resolveInfo = mForegroundT3tIdentifiersCache.get(nfcid2);
     95             Log.d(TAG,
     96                     "Resolved to: " + (resolveInfo == null ? "null" : resolveInfo.toString()));
     97             return resolveInfo;
     98         }
     99     }
    100 
    101     void generateForegroundT3tIdentifiersCacheLocked() {
    102         if (DBG) Log.d(TAG, "generateForegroundT3tIdentifiersCacheLocked");
    103         mForegroundT3tIdentifiersCache.clear();
    104         if (mEnabledForegroundService != null) {
    105             for (NfcFServiceInfo service : mServices) {
    106                 if (mEnabledForegroundService.equals(service.getComponent())) {
    107                     if (!service.getSystemCode().equalsIgnoreCase("NULL") &&
    108                             !service.getNfcid2().equalsIgnoreCase("NULL")) {
    109                         mForegroundT3tIdentifiersCache.put(service.getNfcid2(), service);
    110                     }
    111                     break;
    112                 }
    113             }
    114         }
    115 
    116         if (DBG) {
    117             Log.d(TAG, "mForegroundT3tIdentifiersCache: size=" +
    118                     mForegroundT3tIdentifiersCache.size());
    119             for (Map.Entry<String, NfcFServiceInfo> entry :
    120                     mForegroundT3tIdentifiersCache.entrySet()) {
    121                 Log.d(TAG, "    " + entry.getKey() +
    122                         "/" + entry.getValue().getComponent().toString());
    123             }
    124         }
    125 
    126         updateRoutingLocked();
    127     }
    128 
    129     void updateRoutingLocked() {
    130         if (DBG) Log.d(TAG, "updateRoutingLocked");
    131         if (!mNfcEnabled) {
    132             Log.d(TAG, "Not updating routing table because NFC is off.");
    133             return;
    134         }
    135         List<T3tIdentifier> t3tIdentifiers = new ArrayList<T3tIdentifier>();
    136         Iterator<Map.Entry<String, NfcFServiceInfo>> it;
    137         // Register foreground service
    138         it = mForegroundT3tIdentifiersCache.entrySet().iterator();
    139         while (it.hasNext()) {
    140             Map.Entry<String, NfcFServiceInfo> entry =
    141                     (Map.Entry<String, NfcFServiceInfo>) it.next();
    142             t3tIdentifiers.add(new T3tIdentifier(
    143                     entry.getValue().getSystemCode(), entry.getValue().getNfcid2(), entry.getValue().getT3tPmm()));
    144         }
    145         mRoutingManager.configureRouting(t3tIdentifiers);
    146     }
    147 
    148     public void onServicesUpdated(int userId, List<NfcFServiceInfo> services) {
    149         if (DBG) Log.d(TAG, "onServicesUpdated");
    150         synchronized (mLock) {
    151             if (ActivityManager.getCurrentUser() == userId) {
    152                 // Rebuild our internal data-structures
    153                 mServices = services;
    154             } else {
    155                 Log.d(TAG, "Ignoring update because it's not for the current user.");
    156             }
    157         }
    158     }
    159 
    160     public void onEnabledForegroundNfcFServiceChanged(ComponentName component) {
    161         if (DBG) Log.d(TAG, "Enabled foreground service changed.");
    162         synchronized (mLock) {
    163             if (component != null) {
    164                 if (mEnabledForegroundService != null) {
    165                     return;
    166                 }
    167                 mEnabledForegroundService = component;
    168             } else {
    169                 if (mEnabledForegroundService == null) {
    170                     return;
    171                 }
    172                 mEnabledForegroundService = null;
    173             }
    174             generateForegroundT3tIdentifiersCacheLocked();
    175         }
    176     }
    177 
    178     public void onNfcEnabled() {
    179         synchronized (mLock) {
    180             mNfcEnabled = true;
    181         }
    182     }
    183 
    184     public void onNfcDisabled() {
    185         synchronized (mLock) {
    186             mNfcEnabled = false;
    187             mForegroundT3tIdentifiersCache.clear();
    188             mEnabledForegroundService = null;
    189         }
    190         mRoutingManager.onNfccRoutingTableCleared();
    191     }
    192 
    193     public void onUserSwitched() {
    194         synchronized (mLock) {
    195             mForegroundT3tIdentifiersCache.clear();
    196             updateRoutingLocked();
    197             mEnabledForegroundService = null;
    198         }
    199     }
    200 
    201     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    202         pw.println("T3T Identifier cache entries: ");
    203         for (Map.Entry<String, NfcFServiceInfo> entry : mForegroundT3tIdentifiersCache.entrySet()) {
    204             pw.println("    NFCID2: " + entry.getKey());
    205             pw.println("    NfcFServiceInfo: ");
    206             entry.getValue().dump(fd, pw, args);
    207         }
    208         pw.println("");
    209         mRoutingManager.dump(fd, pw, args);
    210         pw.println("");
    211     }
    212 }
    213