/*
* 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 com.google.android.gms.auth.sample.helloauth;
import com.google.android.gms.auth.GoogleAuthUtil;
import android.os.AsyncTask;
import android.util.Log;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* 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<Void, Void, Void>{
private static final String TAG = "TokenInfoTask";
private static final String NAME_KEY = "given_name";
protected HelloActivity mActivity;
protected String mScope;
protected String mEmail;
protected int mRequestCode;
AbstractGetNameTask(HelloActivity activity, String email, String scope, int requestCode) {
this.mActivity = activity;
this.mScope = scope;
this.mEmail = email;
this.mRequestCode = requestCode;
}
@Override
protected Void doInBackground(Void... params) {
try {
fetchNameFromProfileServer();
} catch (IOException ex) {
onError("Following Error occured, please try again. " + ex.getMessage(), ex);
} catch (JSONException e) {
onError("Bad response: " + e.getMessage(), e);
}
return null;
}
protected void onError(String msg, Exception e) {
if (e != null) {
Log.e(TAG, "Exception: ", e);
}
mActivity.show(msg); // will be run in UI thread
}
/**
* 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 void fetchNameFromProfileServer() throws IOException, JSONException {
String token = fetchToken();
if (token == null) {
// error has already been handled in fetchToken()
return;
}
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();
String name = getFirstName(readResponse(is));
mActivity.show("Hello " + name + "!");
is.close();
return;
} else if (sc == 401) {
GoogleAuthUtil.invalidateToken(mActivity, token);
onError("Server auth error, please try again.", null);
Log.i(TAG, "Server auth error: " + readResponse(con.getErrorStream()));
return;
} else {
onError("Server returned the following error code: " + sc, null);
return;
}
}
/**
* 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");
}
/**
* Parses the response and returns the first name of the user.
* @throws JSONException if the response is not JSON or if first name does not exist in response
*/
private String getFirstName(String jsonResponse) throws JSONException {
JSONObject profile = new JSONObject(jsonResponse);
return profile.getString(NAME_KEY);
}
}