OAuthActivity.java

/*
    Copyright (C) 2012 Prasanna Thirumalai
    
    This file is part of StackX.

    StackX is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    StackX is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with StackX.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.prasanna.android.stacknetwork;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.net.Uri.Builder;
import android.net.http.SslError;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

import com.prasanna.android.stacknetwork.sqlite.TagDAO;
import com.prasanna.android.stacknetwork.utils.AlarmUtils;
import com.prasanna.android.stacknetwork.utils.AppUtils;
import com.prasanna.android.stacknetwork.utils.StackUri;
import com.prasanna.android.stacknetwork.utils.StringConstants;
import com.prasanna.android.utils.LogWrapper;

public class OAuthActivity extends Activity {
  private static final String TAG = OAuthActivity.class.getName();
  private static final String YAHOO_LOGIN_URL = "https://login.yahoo.com";
  private static final String PROGRESS_BAR_TEXT = "to stackexchange.com...";
  private static final String LOGIN = "Login";
  private static boolean TEST_MODE = false;

  private ProgressDialog progressDialog;
  private String oauthUrl;

  protected static void setTestMode() {
    TEST_MODE = true;
  }

  private class OAuthWebViewClient extends WebViewClient {
    @Override
    public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
      if (error != null) {
        Log.e(TAG, error.toString());
      }

      handler.proceed();
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
      LogWrapper.d(TAG, url);

      if (url.startsWith(StackUri.QueryParamDefaultValues.REDIRECT_URI)) {
        TagDAO.deleteAll(OAuthActivity.this);

        AlarmUtils.cancelInboxRefreshAlarm(getApplicationContext());
        AlarmUtils.cancelPeriodicAccountSync(getApplicationContext());
        cacheAccessToken(url);
        AlarmUtils.activatePeriodicAccountSync(getApplicationContext());
        startSiteListActivity(view);
        OAuthActivity.this.finish();
      } else if (url.endsWith("response_type%3dtoken%26state%3d")
          && url.startsWith("https://stackexchange.com/%2foauth%2fdialog%3fclient_id%3d202")) {
        view.loadUrl(oauthUrl);
      } else {
        view.loadUrl(url);
      }
      return true;
    }

    @Override
    public void onPageFinished(WebView view, String url) {
      if (oauthUrl != null && url.startsWith(StackUri.OAUTH_DIALOG_URL) && progressDialog != null) {
        progressDialog.dismiss();
        progressDialog = null;
      } else {
        /*
         * Yahoo's login page does not seem to support horizontal scrolling
         * inside webview, so enabling wide view port. Note good.
         */
        if (url.startsWith(YAHOO_LOGIN_URL))
          view.getSettings().setUseWideViewPort(true);
      }
      super.onPageFinished(view, url);
    }
  }

  private void startSiteListActivity(WebView view) {
    Intent listStackNetworkIntent = new Intent(view.getContext(), StackNetworkListActivity.class);
    listStackNetworkIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    listStackNetworkIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
    listStackNetworkIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(listStackNetworkIntent);
  }

  private void cacheAccessToken(String url) {
    Uri uri = Uri.parse(url);
    String accessToken = uri.getFragment();
    if (accessToken != null) {
      String[] nameValuePair = accessToken.split("=");
      if (nameValuePair != null && nameValuePair.length == 2 && nameValuePair[0].equals(StringConstants.ACCESS_TOKEN)) {
        AppUtils.setAccessToken(getApplicationContext(), nameValuePair[1]);
      }
    }
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    progressDialog = ProgressDialog.show(OAuthActivity.this, "", PROGRESS_BAR_TEXT);
    setContentView(R.layout.webview);
    WebView webview = initWebview();

    Builder uriBuilder = Uri.parse(StackUri.OAUTH_DIALOG_URL).buildUpon();
    uriBuilder.appendQueryParameter(StackUri.QueryParams.CLIENT_ID, StackUri.QueryParamDefaultValues.CLIENT_ID);
    uriBuilder.appendQueryParameter(StackUri.QueryParams.REDIRECT_URI, StackUri.QueryParamDefaultValues.REDIRECT_URI);
    uriBuilder.appendQueryParameter(StackUri.QueryParams.SCOPE, StackUri.QueryParamDefaultValues.SCOPE);

    oauthUrl = uriBuilder.build().toString();
    AppUtils.clearDefaultSite(getApplicationContext());
    webview.loadUrl(oauthUrl);
  }

  @SuppressWarnings("deprecation")
  @SuppressLint("SetJavaScriptEnabled")
  private WebView initWebview() {
    final WebView webview = (WebView) findViewById(R.id.web_view);
    final ProgressBar progressBar = (ProgressBar) findViewById(R.id.webviewProgress);

    webview.setVerticalScrollBarEnabled(true);
    webview.setHorizontalScrollBarEnabled(true);
    webview.getSettings().setJavaScriptEnabled(true);
    webview.getSettings().setDomStorageEnabled(true);
    
    if (!TEST_MODE) {
      webview.getSettings().setSaveFormData(false);
      webview.getSettings().setSavePassword(false);
    }
    webview.getSettings().setUseWideViewPort(false);
    webview.setWebChromeClient(new WebChromeClient() {
      public void onProgressChanged(WebView view, int progress) {
        setTitle("Loading...");

        if (progress < 100 && progressBar.getVisibility() == ProgressBar.GONE) {
          progressBar.setVisibility(ProgressBar.VISIBLE);
        }

        progressBar.setProgress(progress);
        if (progress == 100) {
          progressBar.setVisibility(ProgressBar.GONE);
          setTitle(LOGIN);
        }
      }
    });
    webview.setWebViewClient(new OAuthWebViewClient());
    webview.requestFocus(View.FOCUS_DOWN);
    return webview;
  }
}