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.content.SharedPreferences;
  26 import android.graphics.drawable.BitmapDrawable;
  27 import android.graphics.drawable.Drawable;
  28 import android.net.Uri;
  29 import android.net.http.SslCertificate;
  30 import android.os.Bundle;
  31 import android.preference.PreferenceManager;
  32 import android.text.SpannableStringBuilder;
  33 import android.text.Spanned;
  34 import android.text.style.ForegroundColorSpan;
  35 import android.view.LayoutInflater;
  36 import android.view.View;
  37 import android.view.WindowManager;
  38 import android.widget.TextView;
  39
  40 import androidx.annotation.NonNull;
  41 import androidx.fragment.app.DialogFragment;  // The AndroidX dialog fragment must be used or an error is produced on API <=22.
  42
  43 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  44 import com.stoutner.privacybrowser.R;
  45 import com.stoutner.privacybrowser.fragments.WebViewTabFragment;
  46 import com.stoutner.privacybrowser.views.NestedScrollWebView;
  47
  48 import java.text.DateFormat;
  49 import java.util.Calendar;
  50 import java.util.Date;
  51
  52 // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the `AlertDialog`.
  53 @SuppressLint("InflateParams")
  54 public class ViewSslCertificateDialog extends DialogFragment {
  55     public static ViewSslCertificateDialog displayDialog(long webViewFragmentId) {
  56         // Create an arguments bundle.
  57         Bundle argumentsBundle = new Bundle();
  58
  59         // Store the WebView fragment ID in the bundle.
  60         argumentsBundle.putLong("webview_fragment_id", webViewFragmentId);
  61
  62         // Create a new instance of the dialog.
  63         ViewSslCertificateDialog viewSslCertificateDialog = new ViewSslCertificateDialog();
  64
  65         // Add the bundle to the dialog.
  66         viewSslCertificateDialog.setArguments(argumentsBundle);
  67
  68         // Return the new dialog.
  69         return viewSslCertificateDialog;
  70     }
  71
  72     @NonNull
  73     public Dialog onCreateDialog(Bundle savedInstanceState) {
  74         // Remove the incorrect lint warning below that the activity might be null.
  75         assert getActivity() != null;
  76
  77         // Get the activity's layout inflater.
  78         LayoutInflater layoutInflater = getActivity().getLayoutInflater();
  79
  80         // Get the arguments.
  81         Bundle arguments = getArguments();
  82
  83         // Remove the incorrect lint warning below that `getArguments().getLong()` might be null.
  84         assert arguments != null;
  85
  86         // Get the current position of this WebView fragment.
  87         int webViewPosition = MainWebViewActivity.webViewPagerAdapter.getPositionForId(arguments.getLong("webview_fragment_id"));
  88
  89         // Get the WebView tab fragment.
  90         WebViewTabFragment webViewTabFragment = MainWebViewActivity.webViewPagerAdapter.getPageFragment(webViewPosition);
  91
  92         // Get the fragment view.
  93         View fragmentView = webViewTabFragment.getView();
  94
  95         // Remove the incorrect lint warning below that the fragment view might be null.
  96         assert fragmentView != null;
  97
  98         // Get a handle for the current WebView.
  99         NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
 100
 101         // Use a builder to create the alert dialog.
 102         AlertDialog.Builder dialogBuilder;
 103
 104         // Get a handle for the shared preferences.
 105         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getContext());
 106
 107         // Get the screenshot and theme preferences.
 108         boolean darkTheme = sharedPreferences.getBoolean("dark_theme", false);
 109         boolean allowScreenshots = sharedPreferences.getBoolean("allow_screenshots", false);
 110
 111         // Set the style according to the theme.
 112         if (darkTheme) {
 113             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogDark);
 114         } else {
 115             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogLight);
 116         }
 117
 118         // Create a drawable version of the favorite icon.
 119         Drawable favoriteIconDrawable = new BitmapDrawable(getResources(), nestedScrollWebView.getFavoriteOrDefaultIcon());
 120
 121         // Set the icon.
 122         dialogBuilder.setIcon(favoriteIconDrawable);
 123
 124         // Set a listener on the negative button.  Using `null` as the listener closes the dialog without doing anything else.
 125         dialogBuilder.setNegativeButton(R.string.close, null);
 126
 127         // Get the SSL certificate.
 128         SslCertificate sslCertificate = nestedScrollWebView.getCertificate();
 129
 130         // Check to see if the website is encrypted.
 131         if (sslCertificate == null) {  // The website is not encrypted.
 132             // Set the title.
 133             dialogBuilder.setTitle(R.string.unencrypted_website);
 134
 135             // Set the Layout.  The parent view is `null` because it will be assigned by `AlertDialog`.
 136             dialogBuilder.setView(layoutInflater.inflate(R.layout.unencrypted_website, null));
 137
 138             // Create an alert dialog from the alert dialog builder.
 139             final AlertDialog alertDialog = dialogBuilder.create();
 140
 141             // Disable screenshots if not allowed.
 142             if (!allowScreenshots) {
 143                 // Remove the warning below that `getWindow()` might be null.
 144                 assert alertDialog.getWindow() != null;
 145
 146                 // Disable screenshots.
 147                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 148             }
 149
 150             // `onCreateDialog` requires the return of an `AlertDialog`.
 151             return alertDialog;
 152
 153         } else {  // Display the SSL certificate information
 154             // Set the title.
 155             dialogBuilder.setTitle(R.string.ssl_certificate);
 156
 157             // Set the layout.  The parent view is `null` because it will be assigned by `AlertDialog`.
 158             dialogBuilder.setView(layoutInflater.inflate(R.layout.view_ssl_certificate, null));
 159
 160             // Create an alert dialog from the builder.
 161             final AlertDialog alertDialog = dialogBuilder.create();
 162
 163             // Disable screenshots if not allowed.
 164             if (!allowScreenshots) {
 165                 // Remove the warning below that `getWindow()` might be null.
 166                 assert alertDialog.getWindow() != null;
 167
 168                 // Disable screenshots.
 169                 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
 170             }
 171
 172             // The alert dialog must be shown before items in the layout can be modified.
 173             alertDialog.show();
 174
 175             // Get handles for the text views.
 176             TextView domainTextView = alertDialog.findViewById(R.id.domain);
 177             TextView ipAddressesTextView = alertDialog.findViewById(R.id.ip_addresses);
 178             TextView issuedToCNameTextView = alertDialog.findViewById(R.id.issued_to_cname);
 179             TextView issuedToONameTextView = alertDialog.findViewById(R.id.issued_to_oname);
 180             TextView issuedToUNameTextView = alertDialog.findViewById(R.id.issued_to_uname);
 181             TextView issuedByCNameTextView = alertDialog.findViewById(R.id.issued_by_cname);
 182             TextView issuedByONameTextView = alertDialog.findViewById(R.id.issued_by_oname);
 183             TextView issuedByUNameTextView = alertDialog.findViewById(R.id.issued_by_uname);
 184             TextView startDateTextView = alertDialog.findViewById(R.id.start_date);
 185             TextView endDateTextView = alertDialog.findViewById(R.id.end_date);
 186
 187             // Setup the labels.
 188             String domainLabel = getString(R.string.domain_label) + "  ";
 189             String ipAddressesLabel = getString(R.string.ip_addresses) + "  ";
 190             String cNameLabel = getString(R.string.common_name) + "  ";
 191             String oNameLabel = getString(R.string.organization) + "  ";
 192             String uNameLabel = getString(R.string.organizational_unit) + "  ";
 193             String startDateLabel = getString(R.string.start_date) + "  ";
 194             String endDateLabel = getString(R.string.end_date) + "  ";
 195
 196             // Convert the formatted URL string to a URI.
 197             Uri uri = Uri.parse(nestedScrollWebView.getUrl());
 198
 199             // Extract the domain name from the URI.
 200             String domainString = uri.getHost();
 201
 202             // Get the strings from the SSL certificate.
 203             String issuedToCName = sslCertificate.getIssuedTo().getCName();
 204             String issuedToOName = sslCertificate.getIssuedTo().getOName();
 205             String issuedToUName = sslCertificate.getIssuedTo().getUName();
 206             String issuedByCName = sslCertificate.getIssuedBy().getCName();
 207             String issuedByOName = sslCertificate.getIssuedBy().getOName();
 208             String issuedByUName = sslCertificate.getIssuedBy().getUName();
 209             Date startDate = sslCertificate.getValidNotBeforeDate();
 210             Date endDate = sslCertificate.getValidNotAfterDate();
 211
 212             // Create spannable string builders for each text view that needs multiple colors of text.
 213             SpannableStringBuilder domainStringBuilder = new SpannableStringBuilder(domainLabel + domainString);
 214             SpannableStringBuilder ipAddressesStringBuilder = new SpannableStringBuilder(ipAddressesLabel + nestedScrollWebView.getCurrentIpAddresses());
 215             SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 216             SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 217             SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 218             SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 219             SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 220             SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 221             SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 222             SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 223
 224             // Create a red foreground color span.  The deprecated `getColor` must be used until the minimum API >= 23.
 225             @SuppressWarnings("deprecation") ForegroundColorSpan redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
 226
 227             // Create a blue foreground color span.
 228             ForegroundColorSpan blueColorSpan;
 229
 230             // Set the blue color span according to the theme.  The deprecated `getColor()` must be used until the minimum API >= 23.
 231             if (darkTheme) {
 232                 //noinspection deprecation
 233                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 234             } else {
 235                 //noinspection deprecation
 236                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 237             }
 238
 239             // Remove the incorrect lint error that `.equals` might produce a NullPointerException.
 240             assert domainString != null;
 241
 242             // Formet the domain string and issued to CName colors.
 243             if (domainString.equals(issuedToCName)) {  // `domainString` and `issuedToCName` match.
 244                 // Set the strings to be blue.
 245                 domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 246                 issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 247             } else if(issuedToCName.startsWith("*.")){  // `issuedToCName` begins with a wildcard.
 248                 // Remove the initial `*.`.
 249                 String baseCertificateDomain = issuedToCName.substring(2);
 250
 251                 // Setup a copy of `domainString` to test subdomains.
 252                 String domainStringSubdomain = domainString;
 253
 254                 // Initialize `domainNamesMatch`.
 255                 boolean domainNamesMatch = false;
 256
 257                 // Check all the subdomains in `domainStringSubdomain` against `baseCertificateDomain`.
 258                 while (!domainNamesMatch && domainStringSubdomain.contains(".")) {  // Stop checking if we know that `domainNamesMatch` is `true` or if we run out of  `.`.
 259                     // Test the `domainStringSubdomain` against `baseCertificateDomain`.
 260                     if (domainStringSubdomain.equals(baseCertificateDomain)) {
 261                         domainNamesMatch = true;
 262                     }
 263
 264                     // Strip out the lowest subdomain of `certificateCommonNameSubdomain`.
 265                     domainStringSubdomain = domainStringSubdomain.substring(domainStringSubdomain.indexOf(".") + 1);
 266                 }
 267
 268                 // Format the domain and issued to Common Name according to `domainNamesMatch`.
 269                 if (domainNamesMatch) {  // `domainString` is a subdomain of the wildcard `issuedToCNameString`.
 270                     // Set the strings to be blue.
 271                     domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 272                     issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 273                 } else {  // `domainString` is not a subdomain of the wildcard `issuedToCNameString`.
 274                     // Set the string to be red.
 275                     domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 276                     issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 277                 }
 278             } else {  // The strings do not match and `issuedToCNameString` does not begin with a wildcard.
 279                 // Set the strings to be red.
 280                 domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 281                 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 282             }
 283
 284             // 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.
 285             ipAddressesStringBuilder.setSpan(blueColorSpan, ipAddressesLabel.length(), ipAddressesStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 286             issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 287             issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 288             issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 289             issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 290             issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 291
 292             // Get the current date.
 293             Date currentDate = Calendar.getInstance().getTime();
 294
 295             //  Format the start date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 296             if (startDate.after(currentDate)) {  // The certificate start date is in the future.
 297                 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 298             } else {  // The certificate start date is in the past.
 299                 startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 300             }
 301
 302             // Format the end date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 303             if (endDate.before(currentDate)) {  // The certificate end date is in the past.
 304                 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 305             } else {  // The certificate end date is in the future.
 306                 endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 307             }
 308
 309             // Display the strings.
 310             domainTextView.setText(domainStringBuilder);
 311             ipAddressesTextView.setText(ipAddressesStringBuilder);
 312             issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 313             issuedToONameTextView.setText(issuedToONameStringBuilder);
 314             issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 315             issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 316             issuedByONameTextView.setText(issuedByONameStringBuilder);
 317             issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 318             startDateTextView.setText(startDateStringBuilder);
 319             endDateTextView.setText(endDateStringBuilder);
 320
 321             // `onCreateDialog` requires the return of an alert dialog.
 322             return alertDialog;
 323         }
 324     }
 325 }