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.Context;
  15 import android.content.Intent;
  16 import android.content.SharedPreferences;
  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     SharedPreferences prefs;
  33
  34     @Override
  35     public void onCreate(Bundle savedInstanceState) {
  36         super.onCreate(savedInstanceState);
  37         Log.w(TAG, "Starting task to retrieve request token.");
  38         prefs = PreferenceManager.getDefaultSharedPreferences(this);
  39     }
  40
  41     @Override
  42     protected void onResume() {
  43         super.onResume();
  44         WebView webview = new WebView(this);
  45         webview.getSettings().setJavaScriptEnabled(true);
  46         webview.setVisibility(View.VISIBLE);
  47         setContentView(webview);
  48         String authorizationUrl = new GoogleAuthorizationRequestUrl(
  49                                         ClientCredentials.CLIENT_ID,
  50                                         ClientCredentials.REDIRECT_URI,
  51                                         ClientCredentials.SCOPE).build();
  52         webview.setWebViewClient(new WebViewClient() {
  53             @Override
  54             public void onPageStarted(WebView view, String url, Bitmap bitmap) {
  55                 Log.w(TAG, "onPageStarted : " + url);
  56             }
  57             @Override
  58             public void onPageFinished(WebView view, String url) {
  59                 if (url.startsWith(ClientCredentials.REDIRECT_URI)) {
  60                     try {
  61                         if (url.indexOf("code=")!=-1) {
  62                             String code = extractCodeFromUrl(url);
  63                             AccessTokenResponse accessTokenResponse =
  64                               new GoogleAuthorizationCodeGrant(
  65                                 new NetHttpTransport(),
  66                                 new JacksonFactory(),
  67                                 ClientCredentials.CLIENT_ID,
  68                                 ClientCredentials.CLIENT_SECRET,
  69                                 code,
  70                                 ClientCredentials.REDIRECT_URI).execute();
  71                             CredentialStore credentialStore =
  72                                                     new CredentialStore(prefs);
  73                             credentialStore.write(accessTokenResponse);
  74                             finish();
  75                         } else if (url.indexOf("error=")!=-1) {
  76                             new CredentialStore(prefs).clear();
  77                             finish();
  78                         }
  79                     } catch (IOException e) {
  80                         e.printStackTrace();
  81                     }
  82                 }
  83                 Log.w(TAG, "onPageFinished : " + url);
  84             }
  85
  86             private String extractCodeFromUrl(String url) {
  87                 return url.substring(
  88                             ClientCredentials.REDIRECT_URI.length()+7,
  89                             url.length());
  90             }
  91         });
  92
  93         webview.loadUrl(authorizationUrl);
  94     }
  95 }