src/com/owncloud/android/authentication/SsoWebViewClient.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012-2013 ownCloud Inc.
   3  *
   4  *   This program is free software: you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License version 2,
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  *
  13  *   You should have received a copy of the GNU General Public License
  14  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  */
  17
  18 package com.owncloud.android.authentication;
  19
  20 import java.io.ByteArrayInputStream;
  21 import java.io.IOException;
  22 import java.lang.ref.WeakReference;
  23 import java.security.KeyStore;
  24 import java.security.KeyStoreException;
  25 import java.security.NoSuchAlgorithmException;
  26 import java.security.cert.Certificate;
  27 import java.security.cert.CertificateException;
  28 import java.security.cert.CertificateFactory;
  29 import java.security.cert.X509Certificate;
  30
  31 import com.owncloud.android.lib.common.network.NetworkUtils;
  32 import com.owncloud.android.utils.Log_OC;
  33
  34 import android.content.Context;
  35 import android.graphics.Bitmap;
  36 import android.net.http.SslCertificate;
  37 import android.net.http.SslError;
  38 import android.os.Bundle;
  39 import android.os.Handler;
  40 import android.os.Message;
  41 import android.view.KeyEvent;
  42 import android.view.View;
  43 import android.webkit.CookieManager;
  44 import android.webkit.HttpAuthHandler;
  45 import android.webkit.SslErrorHandler;
  46 import android.webkit.WebResourceResponse;
  47 import android.webkit.WebView;
  48 import android.webkit.WebViewClient;
  49
  50
  51 /**
  52  * Custom {@link WebViewClient} client aimed to catch the end of a single-sign-on process
  53  * running in the {@link WebView} that is attached to.
  54  *
  55  * Assumes that the single-sign-on is kept thanks to a cookie set at the end of the
  56  * authentication process.
  57  *
  58  * @author David A. Velasco
  59  */
  60 public class SsoWebViewClient extends WebViewClient {
  61
  62     private static final String TAG = SsoWebViewClient.class.getSimpleName();
  63
  64     public interface SsoWebViewClientListener {
  65         public void onSsoFinished(String sessionCookie);
  66     }
  67
  68     private Handler mListenerHandler;
  69     private WeakReference<SsoWebViewClientListener> mListenerRef;
  70     private String mTargetUrl;
  71     private String mLastReloadedUrlAtError;
  72
  73     public SsoWebViewClient (Handler listenerHandler, SsoWebViewClientListener listener) {
  74         mListenerHandler = listenerHandler;
  75         mListenerRef = new WeakReference<SsoWebViewClient.SsoWebViewClientListener>(listener);
  76         mTargetUrl = "fake://url.to.be.set";
  77         mLastReloadedUrlAtError = null;
  78     }
  79
  80     public String getTargetUrl() {
  81         return mTargetUrl;
  82     }
  83
  84     public void setTargetUrl(String targetUrl) {
  85         mTargetUrl = targetUrl;
  86     }
  87
  88     @Override
  89     public void onPageStarted (WebView view, String url, Bitmap favicon) {
  90         Log_OC.d(TAG, "onPageStarted : " + url);
  91         super.onPageStarted(view, url, favicon);
  92     }
  93
  94     @Override
  95     public void onFormResubmission (WebView view, Message dontResend, Message resend) {
  96         Log_OC.d(TAG, "onFormResubMission ");
  97
  98         // necessary to grant reload of last page when device orientation is changed after sending a form
  99         resend.sendToTarget();
 100     }
 101
 102     @Override
 103     public boolean shouldOverrideUrlLoading(WebView view, String url) {
 104         return false;
 105     }
 106
 107     @Override
 108     public void onReceivedError (WebView view, int errorCode, String description, String failingUrl) {
 109         Log_OC.e(TAG, "onReceivedError : " + failingUrl + ", code " + errorCode + ", description: " + description);
 110         if (!failingUrl.equals(mLastReloadedUrlAtError)) {
 111             view.reload();
 112             mLastReloadedUrlAtError = failingUrl;
 113         } else {
 114             mLastReloadedUrlAtError = null;
 115             super.onReceivedError(view, errorCode, description, failingUrl);
 116         }
 117     }
 118
 119     @Override
 120     public void onPageFinished (WebView view, String url) {
 121         Log_OC.d(TAG, "onPageFinished : " + url);
 122         mLastReloadedUrlAtError = null;
 123         if (url.startsWith(mTargetUrl)) {
 124             view.setVisibility(View.GONE);
 125             CookieManager cookieManager = CookieManager.getInstance();
 126             final String cookies = cookieManager.getCookie(url);
 127             Log_OC.d(TAG, "Cookies: " + cookies);
 128             if (mListenerHandler != null && mListenerRef != null) {
 129                 // this is good idea because onPageFinished is not running in the UI thread
 130                 mListenerHandler.post(new Runnable() {
 131                     @Override
 132                     public void run() {
 133                         SsoWebViewClientListener listener = mListenerRef.get();
 134                         if (listener != null) {
 135                                 // Send Cookies to the listener
 136                             listener.onSsoFinished(cookies);
 137                         }
 138                     }
 139                 });
 140             }
 141         }
 142     }
 143
 144
 145     @Override
 146     public void doUpdateVisitedHistory (WebView view, String url, boolean isReload) {
 147         Log_OC.d(TAG, "doUpdateVisitedHistory : " + url);
 148     }
 149
 150     @Override
 151     public void onReceivedSslError (WebView view, SslErrorHandler handler, SslError error) {
 152         Log_OC.d(TAG, "onReceivedSslError : " + error);
 153         // Test 1
 154         X509Certificate x509Certificate = getX509CertificateFromError(error);
 155
 156         if (x509Certificate != null) {
 157             Log_OC.d(TAG, "------>>>>> x509Certificate " + x509Certificate.toString());
 158
 159         }
 160
 161         handler.proceed();
 162     }
 163
 164     /**
 165      * Obtain the X509Certificate from SslError
 166      * @param   error     SslError
 167      * @return  X509Certificate from error
 168      */
 169     public X509Certificate getX509CertificateFromError (SslError error) {
 170         Bundle bundle = SslCertificate.saveState(error.getCertificate());
 171         X509Certificate x509Certificate;
 172         byte[] bytes = bundle.getByteArray("x509-certificate");
 173         if (bytes == null) {
 174             x509Certificate = null;
 175         } else {
 176             try {
 177                 CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
 178                 Certificate cert = certFactory.generateCertificate(new ByteArrayInputStream(bytes));
 179                 x509Certificate = (X509Certificate) cert;
 180             } catch (CertificateException e) {
 181                 x509Certificate = null;
 182             }
 183         }
 184
 185 //        if (x509Certificate != null) {
 186 //            Log_OC.d(TAG, "------>>>>> x509Certificate " + x509Certificate.toString());
 187 //        }
 188
 189         return x509Certificate;
 190     }
 191
 192     @Override
 193     public void onReceivedHttpAuthRequest (WebView view, HttpAuthHandler handler, String host, String realm) {
 194         Log_OC.d(TAG, "onReceivedHttpAuthRequest : " + host);
 195     }
 196
 197     @Override
 198     public WebResourceResponse shouldInterceptRequest (WebView view, String url) {
 199         Log_OC.d(TAG, "shouldInterceptRequest : " + url);
 200         return null;
 201     }
 202
 203     @Override
 204     public void onLoadResource (WebView view, String url) {
 205         Log_OC.d(TAG, "onLoadResource : " + url);
 206     }
 207
 208     @Override
 209     public void onReceivedLoginRequest (WebView view, String realm, String account, String args) {
 210         Log_OC.d(TAG, "onReceivedLoginRequest : " + realm + ", " + account + ", " + args);
 211     }
 212
 213     @Override
 214     public void onScaleChanged (WebView view, float oldScale, float newScale) {
 215         Log_OC.d(TAG, "onScaleChanged : " + oldScale + " -> " + newScale);
 216         super.onScaleChanged(view, oldScale, newScale);
 217     }
 218
 219     @Override
 220     public void onUnhandledKeyEvent (WebView view, KeyEvent event) {
 221         Log_OC.d(TAG, "onUnhandledKeyEvent : " + event);
 222     }
 223
 224     @Override
 225     public boolean shouldOverrideKeyEvent (WebView view, KeyEvent event) {
 226         Log_OC.d(TAG, "shouldOverrideKeyEvent : " + event);
 227         return false;
 228     }
 229
 230 }