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/*
* Copyright (c) 2012 The Chromium Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* The "Hello world!" of the Chrome Web Store Licensing API, in Java. This
* program logs the user in with OpenID, fetches their license state with OAuth,
* and prints one of these greetings as appropriate:
*
* 1. Hello *no* license!
* 2. Hello *free trial* license!
* 3. Hello *full* license!
*
* Brian Kennish <bkennish@chromium.org>
*/
package com.example;
import java.io.*;
import java.net.*;
import java.util.HashSet;
import javax.servlet.http.*;
import com.google.appengine.api.users.*;
import com.google.appengine.repackaged.org.json.JSONObject;
import oauth.signpost.OAuthConsumer;
import oauth.signpost.basic.DefaultOAuthConsumer;
/* A Google App Engine servlet. */
@SuppressWarnings("serial")
public class HelloLicenseServlet extends HttpServlet {
/* TODO: The app ID from the Chrome Developer Dashboard. */
public static final String APP_ID = "[INSERT APP ID HERE]";
/* TODO: The token from the Chrome Developer Dashboard. */
private static final String TOKEN = "[INSERT TOKEN HERE]";
/* TODO: The token secret from the Chrome Developer Dashboard. */
private static final String TOKEN_SECRET = "[INSERT TOKEN SECRET HERE]";
/*
* The license server URL, where %s are placeholders for app and
* user IDs
*/
public static final String SERVER_URL =
"https://www.googleapis.com/chromewebstore/v1/licenses/%s/%s";
/* The consumer key. */
public static final String CONSUMER_KEY = "anonymous";
/* The consumer secret. */
public static final String CONSUMER_SECRET = CONSUMER_KEY;
/* Handles "GET" requests. */
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException {
response.setContentType("text/html; charset=UTF-8");
UserService userService = UserServiceFactory.getUserService();
PrintWriter output = response.getWriter();
String url = request.getRequestURI();
if (userService.isUserLoggedIn()) {
// Provide a logout path.
User user = userService.getCurrentUser();
output.printf(
"<strong>%s</strong> | <a href=\"%s\">Sign out</a><br><br>",
user.getEmail(),
userService.createLogoutURL(url)
);
try {
// Send a signed request for the user's license state.
OAuthConsumer oauth =
new DefaultOAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET);
oauth.setTokenWithSecret(TOKEN, TOKEN_SECRET);
URLConnection http =
new URL(
String.format(
SERVER_URL,
APP_ID,
URLEncoder.encode(user.getFederatedIdentity(), "UTF-8")
)
).openConnection();
oauth.sign(http);
http.connect();
// Convert the response from the license server to a string.
BufferedReader input =
new BufferedReader(new InputStreamReader(http.getInputStream()));
String file = "";
for (String line; (line = input.readLine()) != null; file += line);
input.close();
// Parse the string as JSON and display the license state.
JSONObject json = new JSONObject(file);
output.printf(
"Hello <strong>%s</strong> license!",
"YES".equals(json.get("result")) ?
"FULL".equals(json.get("accessLevel")) ? "full" : "free trial" :
"no"
);
} catch (Exception exception) {
// Dump any error.
output.printf("Oops! <strong>%s</strong>", exception.getMessage());
}
} else { // The user isn't logged in.
// Prompt for login.
output.printf(
"<a href=\"%s\">Sign in</a>",
userService.createLoginURL(
url,
null,
"https://www.google.com/accounts/o8/id",
new HashSet<String>()
)
);
}
}
}
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