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AsymmetricFingerprintDialog / src / com.example.android.asymmetricfingerprintdialog /

FingerprintModule.java

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/*
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 * Copyright (C) 2015 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License
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 */
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package com.example.android.asymmetricfingerprintdialog;
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import com.example.android.asymmetricfingerprintdialog.server.StoreBackend;
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import com.example.android.asymmetricfingerprintdialog.server.StoreBackendImpl;
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import android.app.KeyguardManager;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.hardware.fingerprint.FingerprintManager;
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import android.preference.PreferenceManager;
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import android.security.keystore.KeyProperties;
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import android.view.inputmethod.InputMethodManager;
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import java.security.KeyPairGenerator;
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import java.security.KeyStore;
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import java.security.KeyStoreException;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.security.Signature;
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import dagger.Module;
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import dagger.Provides;
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/**
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 * Dagger module for Fingerprint APIs.
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 */
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@Module(
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        library = true,
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        injects = {MainActivity.class}
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)
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public class FingerprintModule {
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    private final Context mContext;
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    public FingerprintModule(Context context) {
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        mContext = context;
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    }
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    @Provides
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    public Context providesContext() {
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        return mContext;
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    }
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    @Provides
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    public FingerprintManager providesFingerprintManager(Context context) {
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        return context.getSystemService(FingerprintManager.class);
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    }
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    @Provides
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    public KeyguardManager providesKeyguardManager(Context context) {
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        return context.getSystemService(KeyguardManager.class);
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    }
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    @Provides
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    public KeyStore providesKeystore() {
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        try {
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            return KeyStore.getInstance("AndroidKeyStore");
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        } catch (KeyStoreException e) {
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            throw new RuntimeException("Failed to get an instance of KeyStore", e);
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        }
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    }
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    @Provides
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    public KeyPairGenerator providesKeyPairGenerator() {
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        try {
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            return KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_EC, "AndroidKeyStore");
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        } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
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            throw new RuntimeException("Failed to get an instance of KeyPairGenerator", e);
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        }
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    }
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    @Provides
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    public Signature providesSignature(KeyStore keyStore) {
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        try {
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            return Signature.getInstance("SHA256withECDSA");
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        } catch (NoSuchAlgorithmException e) {
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            throw new RuntimeException("Failed to get an instance of Signature", e);
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        }
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    }
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    @Provides
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    public InputMethodManager providesInputMethodManager(Context context) {
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        return (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
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    }
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    @Provides
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    public SharedPreferences providesSharedPreferences(Context context) {
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        return PreferenceManager.getDefaultSharedPreferences(context);
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    }
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    @Provides
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    public StoreBackend providesStoreBackend() {
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        return new StoreBackendImpl();
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    }
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}
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