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