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

   1 /*
   2  * Copyright © 2016-2020 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.Activity;
  24 import android.app.Dialog;
  25 import android.content.Context;
  26 import android.content.SharedPreferences;
  27 import android.content.res.Configuration;
  28 import android.graphics.drawable.BitmapDrawable;
  29 import android.graphics.drawable.Drawable;
  30 import android.net.Uri;
  31 import android.net.http.SslCertificate;
  32 import android.os.Bundle;
  33 import android.text.SpannableStringBuilder;
  34 import android.text.Spanned;
  35 import android.text.style.ForegroundColorSpan;
  36 import android.view.LayoutInflater;
  37 import android.view.View;
  38 import android.view.WindowManager;
  39 import android.widget.TextView;
  40
  41 import androidx.annotation.NonNull;
  42 import androidx.appcompat.app.AlertDialog;
  43 import androidx.fragment.app.DialogFragment;
  44 import androidx.preference.PreferenceManager;
  45
  46 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  47 import com.stoutner.privacybrowser.R;
  48 import com.stoutner.privacybrowser.fragments.WebViewTabFragment;
  49 import com.stoutner.privacybrowser.views.NestedScrollWebView;
  50
  51 import java.text.DateFormat;
  52 import java.util.Calendar;
  53 import java.util.Date;
  54
  55 public class ViewSslCertificateDialog extends DialogFragment {
  56     public static ViewSslCertificateDialog displayDialog(long webViewFragmentId) {
  57         // Create an arguments bundle.
  58         Bundle argumentsBundle = new Bundle();
  59
  60         // Store the WebView fragment ID in the bundle.
  61         argumentsBundle.putLong("webview_fragment_id", webViewFragmentId);
  62
  63         // Create a new instance of the dialog.
  64         ViewSslCertificateDialog viewSslCertificateDialog = new ViewSslCertificateDialog();
  65
  66         // Add the bundle to the dialog.
  67         viewSslCertificateDialog.setArguments(argumentsBundle);
  68
  69         // Return the new dialog.
  70         return viewSslCertificateDialog;
  71     }
  72
  73     // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the alert dialog.
  74     @SuppressLint("InflateParams")
  75     @Override
  76     @NonNull
  77     public Dialog onCreateDialog(Bundle savedInstanceState) {
  78         // Get a handle for the activity and the context.
  79         Activity activity = requireActivity();
  80         Context context = requireContext();
  81
  82         // Get the activity's layout inflater.
  83         LayoutInflater layoutInflater = activity.getLayoutInflater();
  84
  85         // Get the arguments.
  86         Bundle arguments = getArguments();
  87
  88         // Remove the incorrect lint warning below that the arguments might be null.
  89         assert arguments != null;
  90
  91         // Get the current position of this WebView fragment.
  92         int webViewPosition = MainWebViewActivity.webViewPagerAdapter.getPositionForId(arguments.getLong("webview_fragment_id"));
  93
  94         // Get the WebView tab fragment.
  95         WebViewTabFragment webViewTabFragment = MainWebViewActivity.webViewPagerAdapter.getPageFragment(webViewPosition);
  96
  97         // Get the fragment view.
  98         View fragmentView = webViewTabFragment.getView();
  99
 100         // Remove the incorrect lint warning below that the fragment view might be null.
 101         assert fragmentView != null;
 102
 103         // Get a handle for the current WebView.
 104         NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
 105
 106
 107         // Use a builder to create the alert dialog.
 108         AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context, R.style.PrivacyBrowserAlertDialog);
 109
 110         // Create a drawable version of the favorite icon.
 111         Drawable favoriteIconDrawable = new BitmapDrawable(getResources(), nestedScrollWebView.getFavoriteOrDefaultIcon());
 112
 113         // Set the icon.
 114         dialogBuilder.setIcon(favoriteIconDrawable);
 115
 116         // Set the close button listener.  Using `null` as the listener closes the dialog without doing anything else.
 117         dialogBuilder.setNegativeButton(R.string.close, null);
 118
 119         // Get the SSL certificate.
 120         SslCertificate sslCertificate = nestedScrollWebView.getCertificate();
 121
 122         // Get a handle for the shared preferences.
 123         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
 124
 125         // Get the screenshot preference.
 126         boolean allowScreenshots = sharedPreferences.getBoolean("allow_screenshots", false);
 127
 128         // Check to see if the website is encrypted.
 129         if (sslCertificate == null) {  // The website is not encrypted.
 130             // Set the title.
 131             dialogBuilder.setTitle(R.string.unencrypted_website);
 132
 133             // Set the Layout.  The parent view is `null` because it will be assigned by the alert dialog.
 134             dialogBuilder.setView(layoutInflater.inflate(R.layout.unencrypted_website_dialog, null));
 135
 136             // Create an alert dialog from the alert dialog builder.
 137             final AlertDialog alertDialog = dialogBuilder.create();
 138
 139             // Disable screenshots if not allowed.
 140             if (!allowScreenshots) {
 141                 // Remove the warning below that `getWindow()` might be null.
 142                 assert alertDialog.getWindow() != null;
 143
 144                 // Disable screenshots.
 145                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 146             }
 147
 148             // `onCreateDialog` requires the return of an `AlertDialog`.
 149             return alertDialog;
 150         } else {  // Display the SSL certificate information
 151             // Set the title.
 152             dialogBuilder.setTitle(R.string.ssl_certificate);
 153
 154             // Set the layout.  The parent view is `null` because it will be assigned by the alert dialog.
 155             dialogBuilder.setView(layoutInflater.inflate(R.layout.view_ssl_certificate_dialog, null));
 156
 157             // Create an alert dialog from the builder.
 158             final AlertDialog alertDialog = dialogBuilder.create();
 159
 160             // Disable screenshots if not allowed.
 161             if (!allowScreenshots) {
 162                 // Remove the warning below that `getWindow()` might be null.
 163                 assert alertDialog.getWindow() != null;
 164
 165                 // Disable screenshots.
 166                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 167             }
 168
 169             // The alert dialog must be shown before items in the layout can be modified.
 170             alertDialog.show();
 171
 172             // Get handles for the text views.
 173             TextView domainTextView = alertDialog.findViewById(R.id.domain);
 174             TextView ipAddressesTextView = alertDialog.findViewById(R.id.ip_addresses);
 175             TextView issuedToCNameTextView = alertDialog.findViewById(R.id.issued_to_cname);
 176             TextView issuedToONameTextView = alertDialog.findViewById(R.id.issued_to_oname);
 177             TextView issuedToUNameTextView = alertDialog.findViewById(R.id.issued_to_uname);
 178             TextView issuedByCNameTextView = alertDialog.findViewById(R.id.issued_by_cname);
 179             TextView issuedByONameTextView = alertDialog.findViewById(R.id.issued_by_oname);
 180             TextView issuedByUNameTextView = alertDialog.findViewById(R.id.issued_by_uname);
 181             TextView startDateTextView = alertDialog.findViewById(R.id.start_date);
 182             TextView endDateTextView = alertDialog.findViewById(R.id.end_date);
 183
 184             // Remove the incorrect warning that the views might be null.
 185             assert domainTextView != null;
 186             assert ipAddressesTextView != null;
 187             assert issuedToCNameTextView != null;
 188             assert issuedToONameTextView != null;
 189             assert issuedToUNameTextView != null;
 190             assert issuedByCNameTextView != null;
 191             assert issuedByONameTextView != null;
 192             assert issuedByUNameTextView != null;
 193             assert startDateTextView != null;
 194             assert endDateTextView != null;
 195
 196             // Setup the labels.
 197             String domainLabel = getString(R.string.domain_label) + "  ";
 198             String ipAddressesLabel = getString(R.string.ip_addresses) + "  ";
 199             String cNameLabel = getString(R.string.common_name) + "  ";
 200             String oNameLabel = getString(R.string.organization) + "  ";
 201             String uNameLabel = getString(R.string.organizational_unit) + "  ";
 202             String startDateLabel = getString(R.string.start_date) + "  ";
 203             String endDateLabel = getString(R.string.end_date) + "  ";
 204
 205             // Convert the formatted URL string to a URI.
 206             Uri uri = Uri.parse(nestedScrollWebView.getUrl());
 207
 208             // Extract the domain name from the URI.
 209             String domainString = uri.getHost();
 210
 211             // Get the strings from the SSL certificate.
 212             String issuedToCName = sslCertificate.getIssuedTo().getCName();
 213             String issuedToOName = sslCertificate.getIssuedTo().getOName();
 214             String issuedToUName = sslCertificate.getIssuedTo().getUName();
 215             String issuedByCName = sslCertificate.getIssuedBy().getCName();
 216             String issuedByOName = sslCertificate.getIssuedBy().getOName();
 217             String issuedByUName = sslCertificate.getIssuedBy().getUName();
 218             Date startDate = sslCertificate.getValidNotBeforeDate();
 219             Date endDate = sslCertificate.getValidNotAfterDate();
 220
 221             // Create spannable string builders for each text view that needs multiple colors of text.
 222             SpannableStringBuilder domainStringBuilder = new SpannableStringBuilder(domainLabel + domainString);
 223             SpannableStringBuilder ipAddressesStringBuilder = new SpannableStringBuilder(ipAddressesLabel + nestedScrollWebView.getCurrentIpAddresses());
 224             SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 225             SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 226             SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 227             SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 228             SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 229             SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 230             SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 231             SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 232
 233             // Define the color spans.
 234             ForegroundColorSpan blueColorSpan;
 235             ForegroundColorSpan redColorSpan;
 236
 237             // Get the current theme status.
 238             int currentThemeStatus = getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
 239
 240             // Set the color spans according to the theme.  The deprecated `getResources()` must be used until the minimum API >= 23.
 241             if (currentThemeStatus == Configuration.UI_MODE_NIGHT_YES) {
 242                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.violet_500));
 243                 redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_900));
 244             } else {
 245                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 246                 redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
 247             }
 248
 249             // Remove the incorrect lint error that `.equals` might produce a NullPointerException.
 250             assert domainString != null;
 251
 252             // Formet the domain string and issued to CName colors.
 253             if (domainString.equals(issuedToCName)) {  // `domainString` and `issuedToCName` match.
 254                 // Set the strings to be blue.
 255                 domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 256                 issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 257             } else if(issuedToCName.startsWith("*.")){  // `issuedToCName` begins with a wildcard.
 258                 // Remove the initial `*.`.
 259                 String baseCertificateDomain = issuedToCName.substring(2);
 260
 261                 // Setup a copy of `domainString` to test subdomains.
 262                 String domainStringSubdomain = domainString;
 263
 264                 // Initialize `domainNamesMatch`.
 265                 boolean domainNamesMatch = false;
 266
 267                 // Check all the subdomains in `domainStringSubdomain` against `baseCertificateDomain`.
 268                 while (!domainNamesMatch && domainStringSubdomain.contains(".")) {  // Stop checking if we know that `domainNamesMatch` is `true` or if we run out of  `.`.
 269                     // Test the `domainStringSubdomain` against `baseCertificateDomain`.
 270                     if (domainStringSubdomain.equals(baseCertificateDomain)) {
 271                         domainNamesMatch = true;
 272                     }
 273
 274                     // Strip out the lowest subdomain of `certificateCommonNameSubdomain`.
 275                     domainStringSubdomain = domainStringSubdomain.substring(domainStringSubdomain.indexOf(".") + 1);
 276                 }
 277
 278                 // Format the domain and issued to Common Name according to `domainNamesMatch`.
 279                 if (domainNamesMatch) {  // `domainString` is a subdomain of the wildcard `issuedToCNameString`.
 280                     // Set the strings to be blue.
 281                     domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 282                     issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 283                 } else {  // `domainString` is not a subdomain of the wildcard `issuedToCNameString`.
 284                     // Set the string to be red.
 285                     domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 286                     issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 287                 }
 288             } else {  // The strings do not match and `issuedToCNameString` does not begin with a wildcard.
 289                 // Set the strings to be red.
 290                 domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 291                 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 292             }
 293
 294             // 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.
 295             ipAddressesStringBuilder.setSpan(blueColorSpan, ipAddressesLabel.length(), ipAddressesStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 296             issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 297             issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 298             issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 299             issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 300             issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 301
 302             // Get the current date.
 303             Date currentDate = Calendar.getInstance().getTime();
 304
 305             //  Format the start date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 306             if (startDate.after(currentDate)) {  // The certificate start date is in the future.
 307                 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 308             } else {  // The certificate start date is in the past.
 309                 startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 310             }
 311
 312             // Format the end date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 313             if (endDate.before(currentDate)) {  // The certificate end date is in the past.
 314                 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 315             } else {  // The certificate end date is in the future.
 316                 endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 317             }
 318
 319             // Display the strings.
 320             domainTextView.setText(domainStringBuilder);
 321             ipAddressesTextView.setText(ipAddressesStringBuilder);
 322             issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 323             issuedToONameTextView.setText(issuedToONameStringBuilder);
 324             issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 325             issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 326             issuedByONameTextView.setText(issuedByONameStringBuilder);
 327             issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 328             startDateTextView.setText(startDateStringBuilder);
 329             endDateTextView.setText(endDateStringBuilder);
 330
 331             // `onCreateDialog` requires the return of an alert dialog.
 332             return alertDialog;
 333         }
 334     }
 335 }