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
  10 import android.app.Activity;
  11 import android.os.Bundle;
  12 import android.graphics.Bitmap;
  13 import android.content.Intent;
  14 import android.content.SharedPreferences;
  15 import android.content.SharedPreferences.Editor;
  16 import android.preference.PreferenceManager;
  17 import android.util.Log;
  18 import android.view.View;
  19 import android.webkit.WebView;
  20 import android.webkit.WebViewClient;
  21
  22 import com.google.api.client.auth.oauth2.draft10.AccessTokenResponse;
  23 import com.google.api.client.googleapis.auth.oauth2.draft10.GoogleAccessTokenRequest.GoogleAuthorizationCodeGrant;
  24 import com.google.api.client.googleapis.auth.oauth2.draft10.GoogleAuthorizationRequestUrl;
  25 import com.google.api.client.http.javanet.NetHttpTransport;
  26 import com.google.api.client.json.jackson.JacksonFactory;
  27
  28 public class Authorize extends Activity {
  29
  30     final String TAG = getClass().getName();
  31
  32     private SharedPreferences prefs;
  33     private static final String ACCESS_TOKEN = "access_token";
  34     private static final String EXPIRES_IN = "expires_in";
  35     private static final String REFRESH_TOKEN = "refresh_token";
  36     private static final String SCOPE = "scope";
  37
  38     @Override
  39     public void onCreate(Bundle savedInstanceState) {
  40         super.onCreate(savedInstanceState);
  41         Log.w(TAG, "Starting task to retrieve request token.");
  42         prefs = PreferenceManager.getDefaultSharedPreferences(this);
  43     }
  44
  45     @Override
  46     protected void onResume() {
  47         super.onResume();
  48         WebView webview = new WebView(this);
  49         webview.getSettings().setJavaScriptEnabled(true);
  50         webview.setVisibility(View.VISIBLE);
  51         setContentView(webview);
  52         String authorizationUrl = new GoogleAuthorizationRequestUrl(
  53                                         ClientCredentials.CLIENT_ID,
  54                                         ClientCredentials.REDIRECT_URI,
  55                                         ClientCredentials.SCOPE).build();
  56         webview.setWebViewClient(new WebViewClient() {
  57             @Override
  58             public void onPageStarted(WebView view, String url, Bitmap bitmap) {
  59                 Log.w(TAG, "onPageStarted : " + url);
  60             }
  61             @Override
  62             public void onPageFinished(WebView view, String url) {
  63                 if (url.startsWith(ClientCredentials.REDIRECT_URI)) {
  64                     try {
  65                         if (url.indexOf("code=")!=-1) {
  66                             String code = extractCodeFromUrl(url);
  67                             AccessTokenResponse accessTokenResponse =
  68                               new GoogleAuthorizationCodeGrant(
  69                                 new NetHttpTransport(),
  70                                 new JacksonFactory(),
  71                                 ClientCredentials.CLIENT_ID,
  72                                 ClientCredentials.CLIENT_SECRET,
  73                                 code,
  74                                 ClientCredentials.REDIRECT_URI).execute();
  75                             storeTokens(accessTokenResponse);
  76                             finish();
  77                             //view.setVisibility(View.INVISIBLE);
  78                             //startActivity(new Intent(Authorize.this,
  79                             //                         WhereAmI.class));
  80                         } else if (url.indexOf("error=")!=-1) {
  81                             clearTokens();
  82                             finish();
  83                             //view.setVisibility(View.INVISIBLE);
  84                             //startActivity(new Intent(Authorize.this,
  85                             //                         WhereAmI.class));
  86                         }
  87                     } catch (IOException e) {
  88                         e.printStackTrace();
  89                     }
  90                 }
  91                 Log.w(TAG, "onPageFinished : " + url);
  92             }
  93
  94             private String extractCodeFromUrl(String url) {
  95                 return url.substring(
  96                             ClientCredentials.REDIRECT_URI.length()+7,
  97                             url.length());
  98             }
  99
 100             private void storeTokens(AccessTokenResponse accessTokenResponse) {
 101                 Log.w(TAG, "Storing tokens: " + accessTokenResponse);
 102                 Editor editor = prefs.edit();
 103                 editor.putString(ACCESS_TOKEN,
 104                                  accessTokenResponse.accessToken);
 105                 editor.putLong(  EXPIRES_IN,
 106                                  accessTokenResponse.expiresIn);
 107                 editor.putString(REFRESH_TOKEN,
 108                                  accessTokenResponse.refreshToken);
 109                 editor.putString(SCOPE,
 110                                  accessTokenResponse.scope);
 111                 editor.commit();
 112             }
 113
 114             private void clearTokens() {
 115                 Log.w(TAG, "Clear tokens");
 116                 Editor editor = prefs.edit();
 117                 editor.remove(ACCESS_TOKEN);
 118                 editor.remove(EXPIRES_IN);
 119                 editor.remove(REFRESH_TOKEN);
 120                 editor.remove(SCOPE);
 121                 editor.commit();
 122             }
 123         });
 124
 125         webview.loadUrl(authorizationUrl);
 126     }
 127 }