app.nichepro.fragmenttab.account.AbstractGetNameTask.java Source code

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Here is the source code for app.nichepro.fragmenttab.account.AbstractGetNameTask.java

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/*
 * Copyright 2012 The Android Open Source Project
 *
 * 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 app.nichepro.fragmenttab.account;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Hashtable;

import org.json.JSONException;

import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.util.Log;

import com.google.android.gms.auth.GoogleAuthUtil;

/**
 * Display personalized greeting. This class contains boilerplate code to
 * consume the token but isn't integral to getting the tokens.
 */
public abstract class AbstractGetNameTask extends AsyncTask<Hashtable<String, String>, String, String> {
    private static final String TAG = "TokenInfoTask";
    protected AccountActivity mActivity;

    protected String mScope;
    protected String mEmail;
    protected int mRequestCode;
    ProgressDialog dialog;
    String error;

    AbstractGetNameTask(AccountActivity activity, String email, String scope, int requestCode) {
        this.mActivity = activity;
        this.mScope = scope;
        this.mEmail = email;
        this.mRequestCode = requestCode;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        dialog = ProgressDialog.show(mActivity, "", "Loading. Please wait...", true);

    }

    @Override
    protected String doInBackground(Hashtable<String, String>... params) {
        String json = null;
        try {
            json = fetchNameFromProfileServer();
        } catch (IOException ex) {
            //         onError("Following Error occured, please try again. "
            //               + ex.getMessage(), ex);
            error = "Following Error occured, please try again. " + ex.getMessage();
        } catch (JSONException e) {
            //onError("Bad response: " + e.getMessage(), e);
            error = "Bad response: " + e.getMessage();

        }
        return json;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);

        if (null != dialog && dialog.isShowing()) {
            dialog.cancel();
        }
        try {
            if (result != null) {
                mActivity.googleLoginSuccess(result);
            } else {
                mActivity.googleLoginUnSuccess(error);
            }

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    protected void onError(String msg, Exception e) {
        if (e != null) {
            Log.e(TAG, "Exception: ", e);
        }
        mActivity.googleLoginUnSuccess(msg);
    }

    /**
     * Get a authentication token if one is not available. If the error is not
     * recoverable then it displays the error message on parent activity.
     */
    protected abstract String fetchToken() throws IOException;

    /**
     * Contacts the user info server to get the profile of the user and extracts
     * the first name of the user from the profile. In order to authenticate
     * with the user info server the method first fetches an access token from
     * Google Play services.
     * 
     * @throws IOException
     *             if communication with user info server failed.
     * @throws JSONException
     *             if the response from the server could not be parsed.
     */
    private String fetchNameFromProfileServer() throws IOException, JSONException {
        String token = fetchToken();
        String json = null;
        if (token == null) {
            // error has already been handled in fetchToken()
            return json;
        }
        URL url = new URL("https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + token);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        int sc = con.getResponseCode();
        if (sc == 200) {
            InputStream is = con.getInputStream();
            // mActivity.googleLoginSuccess(readResponse(is));
            json = readResponse(is);
            is.close();
            return json;
        } else if (sc == 401) {
            GoogleAuthUtil.invalidateToken(mActivity, token);
            // onError("Server auth error, please try again.", null);
            error = "Server auth error, please try again.";
            Log.i(TAG, "Server auth error: " + readResponse(con.getErrorStream()));
            return json;
        } else {
            // onError("Server returned the following error code: " + sc, null);
            error = "Server auth error, please try again.";
            return json;
        }
    }

    /**
     * Reads the response from the input stream and returns it as a string.
     */
    private static String readResponse(InputStream is) throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] data = new byte[2048];
        int len = 0;
        while ((len = is.read(data, 0, data.length)) >= 0) {
            bos.write(data, 0, len);
        }
        return new String(bos.toByteArray(), "UTF-8");
    }

}