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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.example.android.asymmetricfingerprintdialog;
     18 
     19 import com.example.android.asymmetricfingerprintdialog.server.StoreBackend;
     20 import com.example.android.asymmetricfingerprintdialog.server.StoreBackendImpl;
     21 
     22 import android.app.KeyguardManager;
     23 import android.content.Context;
     24 import android.content.SharedPreferences;
     25 import android.hardware.fingerprint.FingerprintManager;
     26 import android.preference.PreferenceManager;
     27 import android.security.keystore.KeyProperties;
     28 import android.view.inputmethod.InputMethodManager;
     29 
     30 import java.security.KeyPairGenerator;
     31 import java.security.KeyStore;
     32 import java.security.KeyStoreException;
     33 import java.security.NoSuchAlgorithmException;
     34 import java.security.NoSuchProviderException;
     35 import java.security.Signature;
     36 
     37 import dagger.Module;
     38 import dagger.Provides;
     39 
     40 /**
     41  * Dagger module for Fingerprint APIs.
     42  */
     43 @Module(
     44         library = true,
     45         injects = {MainActivity.class}
     46 )
     47 public class FingerprintModule {
     48 
     49     private final Context mContext;
     50 
     51     public FingerprintModule(Context context) {
     52         mContext = context;
     53     }
     54 
     55     @Provides
     56     public Context providesContext() {
     57         return mContext;
     58     }
     59 
     60     @Provides
     61     public FingerprintManager providesFingerprintManager(Context context) {
     62         return context.getSystemService(FingerprintManager.class);
     63     }
     64 
     65     @Provides
     66     public KeyguardManager providesKeyguardManager(Context context) {
     67         return context.getSystemService(KeyguardManager.class);
     68     }
     69 
     70     @Provides
     71     public KeyStore providesKeystore() {
     72         try {
     73             return KeyStore.getInstance("AndroidKeyStore");
     74         } catch (KeyStoreException e) {
     75             throw new RuntimeException("Failed to get an instance of KeyStore", e);
     76         }
     77     }
     78 
     79     @Provides
     80     public KeyPairGenerator providesKeyPairGenerator() {
     81         try {
     82             return KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_EC, "AndroidKeyStore");
     83         } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
     84             throw new RuntimeException("Failed to get an instance of KeyPairGenerator", e);
     85         }
     86     }
     87 
     88     @Provides
     89     public Signature providesSignature(KeyStore keyStore) {
     90         try {
     91             return Signature.getInstance("SHA256withECDSA");
     92         } catch (NoSuchAlgorithmException e) {
     93             throw new RuntimeException("Failed to get an instance of Signature", e);
     94         }
     95     }
     96 
     97     @Provides
     98     public InputMethodManager providesInputMethodManager(Context context) {
     99         return (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
    100     }
    101 
    102     @Provides
    103     public SharedPreferences providesSharedPreferences(Context context) {
    104         return PreferenceManager.getDefaultSharedPreferences(context);
    105     }
    106 
    107     @Provides
    108     public StoreBackend providesStoreBackend() {
    109         return new StoreBackendImpl();
    110     }
    111 }
    112