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

   1 /*
   2  * Copyright © 2016-2018 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.app.DialogFragment;
  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.text.SpannableStringBuilder;
  32 import android.text.Spanned;
  33 import android.text.style.ForegroundColorSpan;
  34 import android.view.LayoutInflater;
  35 import android.widget.TextView;
  36
  37 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  38 import com.stoutner.privacybrowser.R;
  39
  40 import java.text.DateFormat;
  41 import java.util.Calendar;
  42 import java.util.Date;
  43
  44 // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the `AlertDialog`.
  45 @SuppressLint("InflateParams")
  46 public class ViewSslCertificateDialog extends DialogFragment {
  47     public Dialog onCreateDialog(Bundle savedInstanceState) {
  48         // Get the activity's layout inflater.
  49         LayoutInflater layoutInflater   = getActivity().getLayoutInflater();
  50
  51         // Create a drawable version of the favorite icon.
  52         Drawable favoriteIconDrawable = new BitmapDrawable(getResources(), MainWebViewActivity.favoriteIconBitmap);
  53
  54         // Use a builder to create the alert dialog.
  55         AlertDialog.Builder dialogBuilder;
  56
  57         // Set the style according to the theme.
  58         if (MainWebViewActivity.darkTheme) {
  59             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogDark);
  60         } else {
  61             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogLight);
  62         }
  63
  64         // Set the icon.
  65         dialogBuilder.setIcon(favoriteIconDrawable);
  66
  67         // Set an `onClick` listener on the negative button.  Using `null` as the listener closes the dialog without doing anything else.
  68         dialogBuilder.setNegativeButton(R.string.close, null);
  69
  70         // Check to see if the website is encrypted.
  71         if (MainWebViewActivity.sslCertificate == null) {  // The website is not encrypted.
  72             // Set the title.
  73             dialogBuilder.setTitle(R.string.unencrypted_website);
  74
  75             // Set the Layout.  The parent view is `null` because it will be assigned by `AlertDialog`.
  76             dialogBuilder.setView(layoutInflater.inflate(R.layout.unencrypted_website, null));
  77
  78             // `onCreateDialog` requires the return of an `AlertDialog`.
  79             return dialogBuilder.create();
  80
  81         } else {  // Display the SSL certificate information
  82             // Set the title.
  83             dialogBuilder.setTitle(R.string.ssl_certificate);
  84
  85             // Set the layout.  The parent view is `null` because it will be assigned by `AlertDialog`.
  86             dialogBuilder.setView(layoutInflater.inflate(R.layout.view_ssl_certificate, null));
  87
  88             // Create an alert dialog from the builder.
  89             final AlertDialog alertDialog = dialogBuilder.create();
  90
  91             // The alert dialog must be shown before items in the layout can be modified.
  92             alertDialog.show();
  93
  94             // Get handles for the `TextViews`.
  95             TextView domainTextView = alertDialog.findViewById(R.id.domain);
  96             TextView issuedToCNameTextView = alertDialog.findViewById(R.id.issued_to_cname);
  97             TextView issuedToONameTextView = alertDialog.findViewById(R.id.issued_to_oname);
  98             TextView issuedToUNameTextView = alertDialog.findViewById(R.id.issued_to_uname);
  99             TextView issuedByCNameTextView = alertDialog.findViewById(R.id.issued_by_cname);
 100             TextView issuedByONameTextView = alertDialog.findViewById(R.id.issued_by_oname);
 101             TextView issuedByUNameTextView = alertDialog.findViewById(R.id.issued_by_uname);
 102             TextView startDateTextView = alertDialog.findViewById(R.id.start_date);
 103             TextView endDateTextView = alertDialog.findViewById(R.id.end_date);
 104
 105             // Setup the labels.
 106             String domainLabel = getString(R.string.domain_label) + "  ";
 107             String cNameLabel = getString(R.string.common_name) + "  ";
 108             String oNameLabel = getString(R.string.organization) + "  ";
 109             String uNameLabel = getString(R.string.organizational_unit) + "  ";
 110             String startDateLabel = getString(R.string.start_date) + "  ";
 111             String endDateLabel = getString(R.string.end_date) + "  ";
 112
 113             // Parse `formattedUrlString` to a `URI`.
 114             Uri uri = Uri.parse(MainWebViewActivity.formattedUrlString);
 115
 116             // Extract the domain name from `uri`.
 117             String domainString = uri.getHost();
 118
 119             // Get the SSL certificate.
 120             SslCertificate sslCertificate = MainWebViewActivity.sslCertificate;
 121
 122             // Get the strings from the SSL certificate.
 123             String issuedToCNameString = sslCertificate.getIssuedTo().getCName();
 124             String issuedToONameString = sslCertificate.getIssuedTo().getOName();
 125             String issuedToUNameString = sslCertificate.getIssuedTo().getUName();
 126             String issuedByCNameString = sslCertificate.getIssuedBy().getCName();
 127             String issuedByONameString = sslCertificate.getIssuedBy().getOName();
 128             String issuedByUNameString = sslCertificate.getIssuedBy().getUName();
 129             Date startDate = sslCertificate.getValidNotBeforeDate();
 130             Date endDate = sslCertificate.getValidNotAfterDate();
 131
 132             // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 133             SpannableStringBuilder domainStringBuilder = new SpannableStringBuilder(domainLabel + domainString);
 134             SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCNameString);
 135             SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToONameString);
 136             SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUNameString);
 137             SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCNameString);
 138             SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByONameString);
 139             SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUNameString);
 140             SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 141             SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 142
 143             // Create a red `ForegroundColorSpan`.  We have to use the deprecated `getColor` until API >= 23.
 144             @SuppressWarnings("deprecation") ForegroundColorSpan redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
 145
 146             // Create a blue `ForegroundColorSpan`.
 147             ForegroundColorSpan blueColorSpan;
 148
 149             // Set `blueColorSpan` according to the theme.  We have to use the deprecated `getColor()` until API >= 23.
 150             if (MainWebViewActivity.darkTheme) {
 151                 //noinspection deprecation
 152                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 153             } else {
 154                 //noinspection deprecation
 155                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 156             }
 157
 158             // Formet the `domainString` and `issuedToCName` colors.
 159             if (domainString.equals(issuedToCNameString)) {  // `domainString` and `issuedToCNameString` match.
 160                 // Set the strings to be blue.
 161                 domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 162                 issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 163             } else if(issuedToCNameString.startsWith("*.")){  // `issuedToCNameString` begins with a wildcard.
 164                 // Remove the initial `*.`.
 165                 String baseCertificateDomain = issuedToCNameString.substring(2);
 166
 167                 // Setup a copy of `domainString` to test subdomains.
 168                 String domainStringSubdomain = domainString;
 169
 170                 // Initialize `domainNamesMatch`.
 171                 boolean domainNamesMatch = false;
 172
 173                 // Check all the subdomains in `domainStringSubdomain` against `baseCertificateDomain`.
 174                 while (!domainNamesMatch && domainStringSubdomain.contains(".")) {  // Stop checking if we know that `domainNamesMatch` is `true` or if we run out of  `.`.
 175                     // Test the `domainStringSubdomain` against `baseCertificateDomain`.
 176                     if (domainStringSubdomain.equals(baseCertificateDomain)) {
 177                         domainNamesMatch = true;
 178                     }
 179
 180                     // Strip out the lowest subdomain of `certificateCommonNameSubdomain`.
 181                     domainStringSubdomain = domainStringSubdomain.substring(domainStringSubdomain.indexOf(".") + 1);
 182                 }
 183
 184                 // Format the domain and issued to Common Name according to `domainNamesMatch`.
 185                 if (domainNamesMatch) {  // `domainString` is a subdomain of the wildcard `issuedToCNameString`.
 186                     // Set the strings to be blue.
 187                     domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 188                     issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 189                 } else {  // `domainString` is not a subdomain of the wildcard `issuedToCNameString`.
 190                     // Set the string to be red.
 191                     domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 192                     issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 193                 }
 194             } else {  // The strings do not match and `issuedToCNameString` does not begin with a wildcard.
 195                 // Set the strings to be red.
 196                 domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 197                 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 198             }
 199
 200             // Setup the issued to and issued by spans to display the certificate information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 201             issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 202             issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 203             issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 204             issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 205             issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 206
 207             Date currentDate = Calendar.getInstance().getTime();
 208
 209             //  Format the start date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 210             if (startDate.after(currentDate)) {  // The certificate start date is in the future.
 211                 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 212             } else {  // The certificate start date is in the past.
 213                 startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 214             }
 215
 216             // Format the end date color.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 217             if (endDate.before(currentDate)) {  // The certificate end date is in the past.
 218                 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 219             } else {  // The certificate end date is in the future.
 220                 endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 221             }
 222
 223             // Display the strings.
 224             domainTextView.setText(domainStringBuilder);
 225             issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 226             issuedToONameTextView.setText(issuedToONameStringBuilder);
 227             issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 228             issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 229             issuedByONameTextView.setText(issuedByONameStringBuilder);
 230             issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 231             startDateTextView.setText(startDateStringBuilder);
 232             endDateTextView.setText(endDateStringBuilder);
 233
 234             // `onCreateDialog` requires the return of an `AlertDialog`.
 235             return alertDialog;
 236         }
 237     }
 238 }