app/src/main/java/com/stoutner/privacybrowser/dialogs/ViewSslCertificateDialog.java

   1 /*
   2  * Copyright © 2016-2019 Soren Stoutner <soren@stoutner.com>.
   3  *
   4  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
   5  *
   6  * Privacy Browser is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Privacy Browser is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 package com.stoutner.privacybrowser.dialogs;
  21
  22 import android.annotation.SuppressLint;
  23 import android.app.AlertDialog;
  24 import android.app.Dialog;
  25 import android.graphics.drawable.BitmapDrawable;
  26 import android.graphics.drawable.Drawable;
  27 import android.net.Uri;
  28 import android.net.http.SslCertificate;
  29 import android.os.Bundle;
  30 import android.text.SpannableStringBuilder;
  31 import android.text.Spanned;
  32 import android.text.style.ForegroundColorSpan;
  33 import android.view.LayoutInflater;
  34 import android.view.View;
  35 import android.view.WindowManager;
  36 import android.widget.TextView;
  37
  38 import androidx.annotation.NonNull;
  39 import androidx.fragment.app.DialogFragment;  // The AndroidX dialog fragment must be used or an error is produced on API <=22.
  40
  41 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  42 import com.stoutner.privacybrowser.R;
  43 import com.stoutner.privacybrowser.fragments.WebViewTabFragment;
  44 import com.stoutner.privacybrowser.views.NestedScrollWebView;
  45
  46 import java.text.DateFormat;
  47 import java.util.Calendar;
  48 import java.util.Date;
  49
  50 // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the `AlertDialog`.
  51 @SuppressLint("InflateParams")
  52 public class ViewSslCertificateDialog extends DialogFragment {
  53     public static ViewSslCertificateDialog displayDialog(long webViewFragmentId) {
  54         // Create an arguments bundle.
  55         Bundle argumentsBundle = new Bundle();
  56
  57         // Store the WebView fragment ID in the bundle.
  58         argumentsBundle.putLong("webview_fragment_id", webViewFragmentId);
  59
  60         // Create a new instance of the dialog.
  61         ViewSslCertificateDialog viewSslCertificateDialog = new ViewSslCertificateDialog();
  62
  63         // Add the bundle to the dialog.
  64         viewSslCertificateDialog.setArguments(argumentsBundle);
  65
  66         // Return the new dialog.
  67         return viewSslCertificateDialog;
  68     }
  69
  70     @NonNull
  71     public Dialog onCreateDialog(Bundle savedInstanceState) {
  72         // Remove the incorrect lint warning below that the activity might be null.
  73         assert getActivity() != null;
  74
  75         // Get the activity's layout inflater.
  76         LayoutInflater layoutInflater = getActivity().getLayoutInflater();
  77
  78         // Remove the incorrect lint warning below that `getArguments().getLong()` might be null.
  79         assert getArguments() != null;
  80
  81         // Get the current position of this WebView fragment.
  82         int webViewPosition = MainWebViewActivity.webViewPagerAdapter.getPositionForId(getArguments().getLong("webview_fragment_id"));
  83
  84         // Get the WebView tab fragment.
  85         WebViewTabFragment webViewTabFragment = MainWebViewActivity.webViewPagerAdapter.getPageFragment(webViewPosition);
  86
  87         // Get the fragment view.
  88         View fragmentView = webViewTabFragment.getView();
  89
  90         // Remove the incorrect lint warning below that the fragment view might be null.
  91         assert fragmentView != null;
  92
  93         // Get a handle for the current WebView.
  94         NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
  95
  96         // Use a builder to create the alert dialog.
  97         AlertDialog.Builder dialogBuilder;
  98
  99         // Set the style according to the theme.
 100         if (MainWebViewActivity.darkTheme) {
 101             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogDark);
 102         } else {
 103             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogLight);
 104         }
 105
 106         // Create a drawable version of the favorite icon.
 107         Drawable favoriteIconDrawable = new BitmapDrawable(getResources(), MainWebViewActivity.favoriteIconBitmap);
 108
 109         // Set the icon.
 110         dialogBuilder.setIcon(favoriteIconDrawable);
 111
 112         // Set a listener on the negative button.  Using `null` as the listener closes the dialog without doing anything else.
 113         dialogBuilder.setNegativeButton(R.string.close, null);
 114
 115         // Get the SSL certificate.
 116         SslCertificate sslCertificate = nestedScrollWebView.getCertificate();
 117
 118         // Check to see if the website is encrypted.
 119         if (sslCertificate == null) {  // The website is not encrypted.
 120             // Set the title.
 121             dialogBuilder.setTitle(R.string.unencrypted_website);
 122
 123             // Set the Layout.  The parent view is `null` because it will be assigned by `AlertDialog`.
 124             dialogBuilder.setView(layoutInflater.inflate(R.layout.unencrypted_website, null));
 125
 126             // Create an alert dialog from the alert dialog builder.
 127             final AlertDialog alertDialog = dialogBuilder.create();
 128
 129             // Disable screenshots if not allowed.
 130             if (!MainWebViewActivity.allowScreenshots) {
 131                 // Remove the warning below that `getWindow()` might be null.
 132                 assert alertDialog.getWindow() != null;
 133
 134                 // Disable screenshots.
 135                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 136             }
 137
 138             // `onCreateDialog` requires the return of an `AlertDialog`.
 139             return alertDialog;
 140
 141         } else {  // Display the SSL certificate information
 142             // Set the title.
 143             dialogBuilder.setTitle(R.string.ssl_certificate);
 144
 145             // Set the layout.  The parent view is `null` because it will be assigned by `AlertDialog`.
 146             dialogBuilder.setView(layoutInflater.inflate(R.layout.view_ssl_certificate, null));
 147
 148             // Create an alert dialog from the builder.
 149             final AlertDialog alertDialog = dialogBuilder.create();
 150
 151             // Disable screenshots if not allowed.
 152             if (!MainWebViewActivity.allowScreenshots) {
 153                 // Remove the warning below that `getWindow()` might be null.
 154                 assert alertDialog.getWindow() != null;
 155
 156                 // Disable screenshots.
 157                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 158             }
 159
 160             // The alert dialog must be shown before items in the layout can be modified.
 161             alertDialog.show();
 162
 163             // Get handles for the text views.
 164             TextView domainTextView = alertDialog.findViewById(R.id.domain);
 165             TextView ipAddressesTextView = alertDialog.findViewById(R.id.ip_addresses);
 166             TextView issuedToCNameTextView = alertDialog.findViewById(R.id.issued_to_cname);
 167             TextView issuedToONameTextView = alertDialog.findViewById(R.id.issued_to_oname);
 168             TextView issuedToUNameTextView = alertDialog.findViewById(R.id.issued_to_uname);
 169             TextView issuedByCNameTextView = alertDialog.findViewById(R.id.issued_by_cname);
 170             TextView issuedByONameTextView = alertDialog.findViewById(R.id.issued_by_oname);
 171             TextView issuedByUNameTextView = alertDialog.findViewById(R.id.issued_by_uname);
 172             TextView startDateTextView = alertDialog.findViewById(R.id.start_date);
 173             TextView endDateTextView = alertDialog.findViewById(R.id.end_date);
 174
 175             // Setup the labels.
 176             String domainLabel = getString(R.string.domain_label) + "  ";
 177             String ipAddressesLabel = getString(R.string.ip_addresses) + "  ";
 178             String cNameLabel = getString(R.string.common_name) + "  ";
 179             String oNameLabel = getString(R.string.organization) + "  ";
 180             String uNameLabel = getString(R.string.organizational_unit) + "  ";
 181             String startDateLabel = getString(R.string.start_date) + "  ";
 182             String endDateLabel = getString(R.string.end_date) + "  ";
 183
 184             // Convert the formatted URL string to a URI.
 185             Uri uri = Uri.parse(MainWebViewActivity.formattedUrlString);
 186
 187             // Extract the domain name from the URI.
 188             String domainString = uri.getHost();
 189
 190             // Get the strings from the SSL certificate.
 191             String issuedToCName = sslCertificate.getIssuedTo().getCName();
 192             String issuedToOName = sslCertificate.getIssuedTo().getOName();
 193             String issuedToUName = sslCertificate.getIssuedTo().getUName();
 194             String issuedByCName = sslCertificate.getIssuedBy().getCName();
 195             String issuedByOName = sslCertificate.getIssuedBy().getOName();
 196             String issuedByUName = sslCertificate.getIssuedBy().getUName();
 197             Date startDate = sslCertificate.getValidNotBeforeDate();
 198             Date endDate = sslCertificate.getValidNotAfterDate();
 199
 200             // Create spannable string builders for each text view that needs multiple colors of text.
 201             SpannableStringBuilder domainStringBuilder = new SpannableStringBuilder(domainLabel + domainString);
 202             SpannableStringBuilder ipAddressesStringBuilder = new SpannableStringBuilder(ipAddressesLabel + nestedScrollWebView.getCurrentIpAddresses());
 203             SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 204             SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 205             SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 206             SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 207             SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 208             SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 209             SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 210             SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 211
 212             // Create a red foreground color span.  The deprecated `getColor` must be used until the minimum API >= 23.
 213             @SuppressWarnings("deprecation") ForegroundColorSpan redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
 214
 215             // Create a blue foreground color span.
 216             ForegroundColorSpan blueColorSpan;
 217
 218             // Set the blue color span according to the theme.  The deprecated `getColor()` must be used until the minimum API >= 23.
 219             if (MainWebViewActivity.darkTheme) {
 220                 //noinspection deprecation
 221                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 222             } else {
 223                 //noinspection deprecation
 224                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 225             }
 226
 227             // Remove the incorrect lint error that `.equals` might produce a NullPointerException.
 228             assert domainString != null;
 229
 230             // Formet the domain string and issued to CName colors.
 231             if (domainString.equals(issuedToCName)) {  // `domainString` and `issuedToCName` match.
 232                 // Set the strings to be blue.
 233                 domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 234                 issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 235             } else if(issuedToCName.startsWith("*.")){  // `issuedToCName` begins with a wildcard.
 236                 // Remove the initial `*.`.
 237                 String baseCertificateDomain = issuedToCName.substring(2);
 238
 239                 // Setup a copy of `domainString` to test subdomains.
 240                 String domainStringSubdomain = domainString;
 241
 242                 // Initialize `domainNamesMatch`.
 243                 boolean domainNamesMatch = false;
 244
 245                 // Check all the subdomains in `domainStringSubdomain` against `baseCertificateDomain`.
 246                 while (!domainNamesMatch && domainStringSubdomain.contains(".")) {  // Stop checking if we know that `domainNamesMatch` is `true` or if we run out of  `.`.
 247                     // Test the `domainStringSubdomain` against `baseCertificateDomain`.
 248                     if (domainStringSubdomain.equals(baseCertificateDomain)) {
 249                         domainNamesMatch = true;
 250                     }
 251
 252                     // Strip out the lowest subdomain of `certificateCommonNameSubdomain`.
 253                     domainStringSubdomain = domainStringSubdomain.substring(domainStringSubdomain.indexOf(".") + 1);
 254                 }
 255
 256                 // Format the domain and issued to Common Name according to `domainNamesMatch`.
 257                 if (domainNamesMatch) {  // `domainString` is a subdomain of the wildcard `issuedToCNameString`.
 258                     // Set the strings to be blue.
 259                     domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 260                     issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 261                 } else {  // `domainString` is not a subdomain of the wildcard `issuedToCNameString`.
 262                     // Set the string to be red.
 263                     domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 264                     issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 265                 }
 266             } else {  // The strings do not match and `issuedToCNameString` does not begin with a wildcard.
 267                 // Set the strings to be red.
 268                 domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 269                 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 270             }
 271
 272             // Set the IP addresses, issued to, and issued by spans to display the certificate information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 273             ipAddressesStringBuilder.setSpan(blueColorSpan, ipAddressesLabel.length(), ipAddressesStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 274             issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 275             issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 276             issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 277             issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 278             issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 279
 280             // Get the current date.
 281             Date currentDate = Calendar.getInstance().getTime();
 282
 283             //  Format the start date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 284             if (startDate.after(currentDate)) {  // The certificate start date is in the future.
 285                 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 286             } else {  // The certificate start date is in the past.
 287                 startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 288             }
 289
 290             // Format the end date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 291             if (endDate.before(currentDate)) {  // The certificate end date is in the past.
 292                 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 293             } else {  // The certificate end date is in the future.
 294                 endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 295             }
 296
 297             // Display the strings.
 298             domainTextView.setText(domainStringBuilder);
 299             ipAddressesTextView.setText(ipAddressesStringBuilder);
 300             issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 301             issuedToONameTextView.setText(issuedToONameStringBuilder);
 302             issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 303             issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 304             issuedByONameTextView.setText(issuedByONameStringBuilder);
 305             issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 306             startDateTextView.setText(startDateStringBuilder);
 307             endDateTextView.setText(endDateStringBuilder);
 308
 309             // `onCreateDialog` requires the return of an alert dialog.
 310             return alertDialog;
 311         }
 312     }
 313 }