sdk doc change: Added KeyChain API Demo
Change-Id: Ib2b751a9de485359705b243d2c70e5f8f2c8ab3c
This commit is contained in:
Tony Chan
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/*
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* Copyright 2012 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.keychain;
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import java.io.BufferedInputStream;
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import java.io.BufferedReader;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.PrintWriter;
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import java.net.Socket;
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import java.security.KeyStore;
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import javax.net.ssl.KeyManagerFactory;
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import javax.net.ssl.SSLContext;
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import javax.net.ssl.SSLServerSocket;
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import javax.net.ssl.SSLServerSocketFactory;
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import android.content.Context;
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import android.util.Base64;
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import android.util.Log;
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public class SecureWebServer {
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// Log tag for this class
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private static final String TAG = "SecureWebServer";
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// File name of the image used in server response
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private static final String EMBEDDED_IMAGE_FILENAME = "training-prof.png";
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private SSLServerSocketFactory sssf;
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private SSLServerSocket sss;
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// A flag to control whether the web server should be kept running
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private boolean isRunning = true;
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// The base64 encoded image string used as an embedded image
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private final String base64Image;
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/**
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* WebServer constructor.
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*/
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public SecureWebServer(Context ctx) {
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try {
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// Get an SSL context using the TLS protocol
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SSLContext sslContext = SSLContext.getInstance("TLS");
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// Get a key manager factory using the default algorithm
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KeyManagerFactory kmf = KeyManagerFactory
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.getInstance(KeyManagerFactory.getDefaultAlgorithm());
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// Load the PKCS12 key chain
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KeyStore ks = KeyStore.getInstance("PKCS12");
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FileInputStream fis = ctx.getAssets()
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.openFd(KeyChainDemoActivity.PKCS12_FILENAME)
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.createInputStream();
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ks.load(fis, KeyChainDemoActivity.PKCS12_PASSWORD.toCharArray());
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kmf.init(ks, KeyChainDemoActivity.PKCS12_PASSWORD.toCharArray());
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// Initialize the SSL context
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sslContext.init(kmf.getKeyManagers(), null, null);
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// Create the SSL server socket factory
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sssf = sslContext.getServerSocketFactory();
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} catch (Exception e) {
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e.printStackTrace();
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}
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// Create the base64 image string used in the server response
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base64Image = createBase64Image(ctx);
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}
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/**
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* This method starts the web server listening to the port 8080
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*/
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protected void start() {
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new Thread(new Runnable() {
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@Override
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public void run() {
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Log.d(TAG, "Secure Web Server is starting up on port 8080");
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try {
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// Create the secure server socket
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sss = (SSLServerSocket) sssf.createServerSocket(8080);
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} catch (Exception e) {
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System.out.println("Error: " + e);
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return;
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}
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Log.d(TAG, "Waiting for connection");
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while (isRunning) {
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try {
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// Wait for an SSL connection
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Socket socket = sss.accept();
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// Got a connection
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Log.d(TAG, "Connected, sending data.");
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BufferedReader in = new BufferedReader(
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new InputStreamReader(socket.getInputStream()));
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PrintWriter out = new PrintWriter(socket
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.getOutputStream());
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// Read the data until a blank line is reached which
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// signifies the end of the client HTTP headers
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String str = ".";
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while (!str.equals(""))
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str = in.readLine();
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// Send a HTTP response
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out.println("HTTP/1.0 200 OK");
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out.println("Content-Type: text/html");
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out.println("Server: Android KeyChainiDemo SSL Server");
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// this blank line signals the end of the headers
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out.println("");
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// Send the HTML page
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out.println("<H1>Welcome to Android!</H1>");
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// Add an embedded Android image
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out.println("<img src='data:image/png;base64," + base64Image + "'/>");
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out.flush();
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socket.close();
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} catch (Exception e) {
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Log.d(TAG, "Error: " + e);
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}
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}
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}
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}).start();
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}
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/**
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* This method stops the SSL web server
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*/
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protected void stop() {
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try {
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// Break out from the infinite while loop in start()
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isRunning = false;
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// Close the socket
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if (sss != null) {
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sss.close();
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* This method reads a binary image from the assets folder and returns the
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* base64 encoded image string.
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*
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* @param ctx The service this web server is running in.
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* @return String The base64 encoded image string or "" if there is an
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* exception
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*/
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private String createBase64Image(Context ctx) {
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BufferedInputStream bis;
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try {
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bis = new BufferedInputStream(ctx.getAssets().open(EMBEDDED_IMAGE_FILENAME));
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byte[] embeddedImage = new byte[bis.available()];
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bis.read(embeddedImage);
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return Base64.encodeToString(embeddedImage, Base64.DEFAULT);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return "";
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}
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}
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