Java tutorial
package be.kuleuven.noiseapp.auth; /* * 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. */ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.math.BigInteger; import java.net.HttpURLConnection; import java.net.URL; import java.util.ArrayList; import org.json.JSONException; import org.json.JSONObject; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.os.AsyncTask; import android.preference.PreferenceManager; import android.util.Log; import be.kuleuven.noiseapp.MainActivity; import be.kuleuven.noiseapp.tools.ImageDownloaderTask; import be.kuleuven.noiseapp.tools.MemoryFileNames; import be.kuleuven.noiseapp.tools.ObjectSerializer; 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 AbstractGetInfoTask extends AsyncTask<Void, Void, UserDetails> { private static final String TAG = "TokenInfoTask"; private static final String GOOGLEID_KEY = "id"; private static final String NAME_KEY = "given_name"; private static final String FAMILY_NAME_KEY = "family_name"; private static final String PICTURE_KEY = "picture"; protected MainActivity mActivity; protected String mScope; protected String mEmail; protected int mRequestCode; AbstractGetInfoTask(MainActivity activity, String email, String scope, int requestCode) { this.mActivity = activity; this.mScope = scope; this.mEmail = email; this.mRequestCode = requestCode; } @Override protected UserDetails doInBackground(Void... params) { try { return fetchInfoFromGoogleServer(); } catch (IOException ex) { onError("Following Error occured, please try again. " + ex.getMessage(), ex); } catch (JSONException e) { onError("Bad response: " + e.getMessage(), e); } return null; } @Override protected void onPostExecute(UserDetails userDetails) { saveUserProfile(userDetails); return; } protected void onError(String msg, Exception e) { if (e != null) { Log.e(TAG, "Exception: ", e); } } /** * 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 UserDetails fetchInfoFromGoogleServer() throws IOException, JSONException { String token = fetchToken(); if (token == null) { // error has already been handled in fetchToken() return null; } 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 response = readResponse(is); JSONObject profile = new JSONObject(response); BigInteger googleID = getGoogleID(profile); String firstName = getFirstName(profile); String lastName = getLastName(profile); String pictureURL = getPicture(profile); is.close(); return new UserDetails(0L, googleID, firstName, lastName, mEmail, 0L, 0L, new ArrayList<Integer>(), null, pictureURL); } 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 null; } else { onError("Server returned the following error code: " + sc, null); Log.i(TAG, "Server auth error: " + readResponse(con.getErrorStream())); return null; } } private void saveUserProfile(UserDetails userDetails) { if (userDetails != null) { //TODO check saveUserProfileLocal(userDetails); saveUserProfileServer(userDetails); } } /** * 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"); } private void saveUserProfileLocal(UserDetails userDetails) { SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(mActivity); Editor edit = sp.edit(); edit.putString(MemoryFileNames.USERDETAILS, ObjectSerializer.serialize(userDetails)); edit.commit(); if (userDetails != null) { //TODO check! new ImageDownloaderTask(mActivity, MemoryFileNames.PROFILE_PICTURE) .execute(userDetails.getPictureURL()); } } private void saveUserProfileServer(UserDetails userDetails) { new CreateUserProfileTask(mActivity).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, userDetails); } private BigInteger getGoogleID(JSONObject profile) throws JSONException { try { return new BigInteger(profile.getString(GOOGLEID_KEY)); } catch (JSONException e) { e.printStackTrace(); return new BigInteger("0"); } } /** * 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(JSONObject profile) { try { return profile.getString(NAME_KEY); } catch (JSONException e) { e.printStackTrace(); return "Unknown"; } } /** * Parses the response and returns the last name of the user. * * @throws JSONException * if the response is not JSON or if first name does not exist * in response */ private String getLastName(JSONObject profile) { try { return profile.getString(FAMILY_NAME_KEY); } catch (JSONException e) { e.printStackTrace(); return "Unknown"; } } private String getPicture(JSONObject profile) { try { return profile.getString(PICTURE_KEY); } catch (JSONException e) { e.printStackTrace(); return "http://i.stack.imgur.com/WmvM0.png"; } } }