src/org/average/whereami/Authorize.java

   1 // http://blog.doityourselfandroid.com/2011/08/06/oauth-2-0-flow-android/
   2 // http://code.google.com/p/google-api-java-client/wiki/OAuth2Draft10
   3
   4 package org.average.whereami;
   5
   6 import java.io.IOException;
   7
   8 import org.average.whereami.ClientCredentials;
   9 import org.average.whereami.CredentialStore;
  10
  11 import android.app.Activity;
  12 import android.os.Bundle;
  13 import android.graphics.Bitmap;
  14 import android.content.Intent;
  15 import android.content.SharedPreferences;
  16 import android.content.SharedPreferences.Editor;
  17 import android.preference.PreferenceManager;
  18 import android.util.Log;
  19 import android.view.View;
  20 import android.webkit.WebView;
  21 import android.webkit.WebViewClient;
  22
  23 import com.google.api.client.auth.oauth2.draft10.AccessTokenResponse;
  24 import com.google.api.client.googleapis.auth.oauth2.draft10.GoogleAccessTokenRequest.GoogleAuthorizationCodeGrant;
  25 import com.google.api.client.googleapis.auth.oauth2.draft10.GoogleAuthorizationRequestUrl;
  26 import com.google.api.client.http.javanet.NetHttpTransport;
  27 import com.google.api.client.json.jackson.JacksonFactory;
  28
  29 public class Authorize extends Activity {
  30
  31     final String TAG = getClass().getName();
  32
  33     private SharedPreferences prefs;
  34     private static final String ACCESS_TOKEN = "access_token";
  35     private static final String EXPIRES_IN = "expires_in";
  36     private static final String REFRESH_TOKEN = "refresh_token";
  37     private static final String SCOPE = "scope";
  38
  39     @Override
  40     public void onCreate(Bundle savedInstanceState) {
  41         super.onCreate(savedInstanceState);
  42         Log.w(TAG, "Starting task to retrieve request token.");
  43         prefs = PreferenceManager.getDefaultSharedPreferences(this);
  44     }
  45
  46     @Override
  47     protected void onResume() {
  48         super.onResume();
  49         WebView webview = new WebView(this);
  50         webview.getSettings().setJavaScriptEnabled(true);
  51         webview.setVisibility(View.VISIBLE);
  52         setContentView(webview);
  53         String authorizationUrl = new GoogleAuthorizationRequestUrl(
  54                                         ClientCredentials.CLIENT_ID,
  55                                         ClientCredentials.REDIRECT_URI,
  56                                         ClientCredentials.SCOPE).build();
  57         webview.setWebViewClient(new WebViewClient() {
  58             @Override
  59             public void onPageStarted(WebView view, String url, Bitmap bitmap) {
  60                 Log.w(TAG, "onPageStarted : " + url);
  61             }
  62             @Override
  63             public void onPageFinished(WebView view, String url) {
  64                 if (url.startsWith(ClientCredentials.REDIRECT_URI)) {
  65                     try {
  66                         if (url.indexOf("code=")!=-1) {
  67                             String code = extractCodeFromUrl(url);
  68                             AccessTokenResponse accessTokenResponse =
  69                               new GoogleAuthorizationCodeGrant(
  70                                 new NetHttpTransport(),
  71                                 new JacksonFactory(),
  72                                 ClientCredentials.CLIENT_ID,
  73                                 ClientCredentials.CLIENT_SECRET,
  74                                 code,
  75                                 ClientCredentials.REDIRECT_URI).execute();
  76                             CredentialStore credentialStore =
  77                                                new CredentialStore(prefs);
  78                             credentialStore.write(accessTokenResponse);
  79                             finish();
  80                             //view.setVisibility(View.INVISIBLE);
  81                             //startActivity(new Intent(Authorize.this,
  82                             //                         WhereAmI.class));
  83                         } else if (url.indexOf("error=")!=-1) {
  84                             new CredentialStore(prefs).clear();
  85                             finish();
  86                             //view.setVisibility(View.INVISIBLE);
  87                             //startActivity(new Intent(Authorize.this,
  88                             //                         WhereAmI.class));
  89                         }
  90                     } catch (IOException e) {
  91                         e.printStackTrace();
  92                     }
  93                 }
  94                 Log.w(TAG, "onPageFinished : " + url);
  95             }
  96
  97             private String extractCodeFromUrl(String url) {
  98                 return url.substring(
  99                             ClientCredentials.REDIRECT_URI.length()+7,
 100                             url.length());
 101             }
 102         });
 103
 104         webview.loadUrl(authorizationUrl);
 105     }
 106 }