org.androidnerds.reader.util.api.Authentication.java Source code

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Here is the source code for org.androidnerds.reader.util.api.Authentication.java

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/* Copyright (C) 2009, 2010 Android Nerds Software
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.androidnerds.reader.util.api;

import android.util.Log;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.cookie.BasicClientCookie;
import org.apache.http.message.BasicNameValuePair;

/**
 * This class does not get instantiated and all of the member methods are static. 
 * It provides authentication parameters for the other classes in the application.
 *
 * @author mike novak
 */
public class Authentication {

    private static final String TAG = "Authentication";
    private static final String TOKEN_URL = "http://www.google.com/reader/api/0/token";
    private static final String AUTH_URL = "https://www.google.com/accounts/ClientLogin";

    private Authentication() {
    }

    /**
     * This method returns back to the caller a proper authentication token to use with
     * the other API calls to Google Reader.
     *
     * @param user - the Google username
     * @param pass - the Google password
     * @return sid - the returned authentication token for use with the API.
     *
     */
    public static String getAuthToken(String user, String pass) {
        NameValuePair username = new BasicNameValuePair("Email", user);
        NameValuePair password = new BasicNameValuePair("Passwd", pass);
        NameValuePair service = new BasicNameValuePair("service", "reader");
        List<NameValuePair> pairs = new ArrayList<NameValuePair>();
        pairs.add(username);
        pairs.add(password);
        pairs.add(service);

        try {
            DefaultHttpClient client = new DefaultHttpClient();
            HttpPost post = new HttpPost(AUTH_URL);
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs);

            post.setEntity(entity);

            HttpResponse response = client.execute(post);
            HttpEntity respEntity = response.getEntity();

            Log.d(TAG, "Server Response: " + response.getStatusLine());

            InputStream in = respEntity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            String line = null;
            String result = null;

            while ((line = reader.readLine()) != null) {
                if (line.startsWith("SID")) {
                    result = line.substring(line.indexOf("=") + 1);
                }
            }

            reader.close();
            client.getConnectionManager().shutdown();

            return result;
        } catch (Exception e) {
            Log.d(TAG, "Exception caught:: " + e.toString());
            return null;
        }
    }

    /**
     * This method generates a quick token to send with API requests that require
     * editing content. This method is called as the API request is being built so
     * that it doesn't expire prior to the actual execution.
     *
     * @param sid - the user's authentication token from ClientLogin
     * @return token - the edit token generated by the server.
     *
     */
    public static String generateFastToken(String sid) {
        try {
            BasicClientCookie cookie = Authentication.buildCookie(sid);
            DefaultHttpClient client = new DefaultHttpClient();

            client.getCookieStore().addCookie(cookie);

            HttpGet get = new HttpGet(TOKEN_URL);
            HttpResponse response = client.execute(get);
            HttpEntity entity = response.getEntity();

            Log.d(TAG, "Server Response: " + response.getStatusLine());

            InputStream in = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            String line = null;

            while ((line = reader.readLine()) != null) {
                Log.d(TAG, "Response Content: " + line);
            }

            reader.close();
            client.getConnectionManager().shutdown();

            return line;
        } catch (Exception e) {
            Log.d(TAG, "Exception caught:: " + e.toString());
            return null;
        }
    }

    /**
     * This method sets up the sid cookie for the httpclient. Each client
     * calls this method to build the cookie so the request is properly
     * authenticated.
     *
     * @param sid - the user's authentication token from ClientLogin.
     * @return cookie - the cookie object to add to the httpclient store.
     *
     */
    public static BasicClientCookie buildCookie(String sid) {
        BasicClientCookie cookie = new BasicClientCookie("SID", sid);
        cookie.setDomain(".google.com");
        cookie.setPath("/");

        return cookie;
    }
}