2 * Copyright © 2016-2019 Soren Stoutner <soren@stoutner.com>.
4 * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
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.
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.
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/>.
20 package com.stoutner.privacybrowser.dialogs;
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.WindowManager;
35 import android.widget.TextView;
37 import androidx.annotation.NonNull;
38 import androidx.fragment.app.DialogFragment; // The AndroidX dialog fragment must be used or an error is produced on API <=22.
40 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
41 import com.stoutner.privacybrowser.R;
42 import java.text.DateFormat;
43 import java.util.Calendar;
44 import java.util.Date;
46 // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the `AlertDialog`.
47 @SuppressLint("InflateParams")
48 public class ViewSslCertificateDialog extends DialogFragment {
50 public Dialog onCreateDialog(Bundle savedInstanceState) {
51 // Remove the incorrect lint warning below that the activity might be null.
52 assert getActivity() != null;
54 // Get the activity's layout inflater.
55 LayoutInflater layoutInflater = getActivity().getLayoutInflater();
57 // Use a builder to create the alert dialog.
58 AlertDialog.Builder dialogBuilder;
60 // Set the style according to the theme.
61 if (MainWebViewActivity.darkTheme) {
62 dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogDark);
64 dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogLight);
67 // Create a drawable version of the favorite icon.
68 Drawable favoriteIconDrawable = new BitmapDrawable(getResources(), MainWebViewActivity.favoriteIconBitmap);
71 dialogBuilder.setIcon(favoriteIconDrawable);
73 // Set a listener on the negative button. Using `null` as the listener closes the dialog without doing anything else.
74 dialogBuilder.setNegativeButton(R.string.close, null);
76 // Check to see if the website is encrypted.
77 if (MainWebViewActivity.sslCertificate == null) { // The website is not encrypted.
79 dialogBuilder.setTitle(R.string.unencrypted_website);
81 // Set the Layout. The parent view is `null` because it will be assigned by `AlertDialog`.
82 dialogBuilder.setView(layoutInflater.inflate(R.layout.unencrypted_website, null));
84 // Create an alert dialog from the alert dialog builder.
85 final AlertDialog alertDialog = dialogBuilder.create();
87 // Disable screenshots if not allowed.
88 if (!MainWebViewActivity.allowScreenshots) {
89 // Remove the warning below that `getWindow()` might be null.
90 assert alertDialog.getWindow() != null;
92 // Disable screenshots.
93 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
96 // `onCreateDialog` requires the return of an `AlertDialog`.
99 } else { // Display the SSL certificate information
101 dialogBuilder.setTitle(R.string.ssl_certificate);
103 // Set the layout. The parent view is `null` because it will be assigned by `AlertDialog`.
104 dialogBuilder.setView(layoutInflater.inflate(R.layout.view_ssl_certificate, null));
106 // Create an alert dialog from the builder.
107 final AlertDialog alertDialog = dialogBuilder.create();
109 // Disable screenshots if not allowed.
110 if (!MainWebViewActivity.allowScreenshots) {
111 // Remove the warning below that `getWindow()` might be null.
112 assert alertDialog.getWindow() != null;
114 // Disable screenshots.
115 alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
118 // The alert dialog must be shown before items in the layout can be modified.
121 // Get handles for the text views.
122 TextView domainTextView = alertDialog.findViewById(R.id.domain);
123 TextView ipAddressesTextView = alertDialog.findViewById(R.id.ip_addresses);
124 TextView issuedToCNameTextView = alertDialog.findViewById(R.id.issued_to_cname);
125 TextView issuedToONameTextView = alertDialog.findViewById(R.id.issued_to_oname);
126 TextView issuedToUNameTextView = alertDialog.findViewById(R.id.issued_to_uname);
127 TextView issuedByCNameTextView = alertDialog.findViewById(R.id.issued_by_cname);
128 TextView issuedByONameTextView = alertDialog.findViewById(R.id.issued_by_oname);
129 TextView issuedByUNameTextView = alertDialog.findViewById(R.id.issued_by_uname);
130 TextView startDateTextView = alertDialog.findViewById(R.id.start_date);
131 TextView endDateTextView = alertDialog.findViewById(R.id.end_date);
134 String domainLabel = getString(R.string.domain_label) + " ";
135 String ipAddressesLabel = getString(R.string.ip_addresses) + " ";
136 String cNameLabel = getString(R.string.common_name) + " ";
137 String oNameLabel = getString(R.string.organization) + " ";
138 String uNameLabel = getString(R.string.organizational_unit) + " ";
139 String startDateLabel = getString(R.string.start_date) + " ";
140 String endDateLabel = getString(R.string.end_date) + " ";
142 // Convert the formatted URL string to a URI.
143 Uri uri = Uri.parse(MainWebViewActivity.formattedUrlString);
145 // Extract the domain name from the URI.
146 String domainString = uri.getHost();
148 // Get the SSL certificate.
149 SslCertificate sslCertificate = MainWebViewActivity.sslCertificate;
151 // Get the strings from the SSL certificate.
152 String issuedToCName = sslCertificate.getIssuedTo().getCName();
153 String issuedToOName = sslCertificate.getIssuedTo().getOName();
154 String issuedToUName = sslCertificate.getIssuedTo().getUName();
155 String issuedByCName = sslCertificate.getIssuedBy().getCName();
156 String issuedByOName = sslCertificate.getIssuedBy().getOName();
157 String issuedByUName = sslCertificate.getIssuedBy().getUName();
158 Date startDate = sslCertificate.getValidNotBeforeDate();
159 Date endDate = sslCertificate.getValidNotAfterDate();
161 // Create spannable string builders for each text view that needs multiple colors of text.
162 SpannableStringBuilder domainStringBuilder = new SpannableStringBuilder(domainLabel + domainString);
163 SpannableStringBuilder ipAddressesStringBuilder = new SpannableStringBuilder(ipAddressesLabel + MainWebViewActivity.currentHostIpAddresses);
164 SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
165 SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
166 SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
167 SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
168 SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
169 SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
170 SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
171 SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
173 // Create a red foreground color span. The deprecated `getColor` must be used until the minimum API >= 23.
174 @SuppressWarnings("deprecation") ForegroundColorSpan redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
176 // Create a blue foreground color span.
177 ForegroundColorSpan blueColorSpan;
179 // Set the blue color span according to the theme. The deprecated `getColor()` must be used until the minimum API >= 23.
180 if (MainWebViewActivity.darkTheme) {
181 //noinspection deprecation
182 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
184 //noinspection deprecation
185 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
188 // Remove the incorrect lint error that `.equals` might produce a NullPointerException.
189 assert domainString != null;
191 // Formet the domain string and issued to CName colors.
192 if (domainString.equals(issuedToCName)) { // `domainString` and `issuedToCName` match.
193 // Set the strings to be blue.
194 domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
195 issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
196 } else if(issuedToCName.startsWith("*.")){ // `issuedToCName` begins with a wildcard.
197 // Remove the initial `*.`.
198 String baseCertificateDomain = issuedToCName.substring(2);
200 // Setup a copy of `domainString` to test subdomains.
201 String domainStringSubdomain = domainString;
203 // Initialize `domainNamesMatch`.
204 boolean domainNamesMatch = false;
206 // Check all the subdomains in `domainStringSubdomain` against `baseCertificateDomain`.
207 while (!domainNamesMatch && domainStringSubdomain.contains(".")) { // Stop checking if we know that `domainNamesMatch` is `true` or if we run out of `.`.
208 // Test the `domainStringSubdomain` against `baseCertificateDomain`.
209 if (domainStringSubdomain.equals(baseCertificateDomain)) {
210 domainNamesMatch = true;
213 // Strip out the lowest subdomain of `certificateCommonNameSubdomain`.
214 domainStringSubdomain = domainStringSubdomain.substring(domainStringSubdomain.indexOf(".") + 1);
217 // Format the domain and issued to Common Name according to `domainNamesMatch`.
218 if (domainNamesMatch) { // `domainString` is a subdomain of the wildcard `issuedToCNameString`.
219 // Set the strings to be blue.
220 domainStringBuilder.setSpan(blueColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
221 issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
222 } else { // `domainString` is not a subdomain of the wildcard `issuedToCNameString`.
223 // Set the string to be red.
224 domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
225 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
227 } else { // The strings do not match and `issuedToCNameString` does not begin with a wildcard.
228 // Set the strings to be red.
229 domainStringBuilder.setSpan(redColorSpan, domainLabel.length(), domainStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
230 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
233 // 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.
234 ipAddressesStringBuilder.setSpan(blueColorSpan, ipAddressesLabel.length(), ipAddressesStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
235 issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
236 issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
237 issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
238 issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
239 issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
241 // Get the current date.
242 Date currentDate = Calendar.getInstance().getTime();
244 // Format the start date color. `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
245 if (startDate.after(currentDate)) { // The certificate start date is in the future.
246 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
247 } else { // The certificate start date is in the past.
248 startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
251 // Format the end date color. `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
252 if (endDate.before(currentDate)) { // The certificate end date is in the past.
253 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
254 } else { // The certificate end date is in the future.
255 endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
258 // Display the strings.
259 domainTextView.setText(domainStringBuilder);
260 ipAddressesTextView.setText(ipAddressesStringBuilder);
261 issuedToCNameTextView.setText(issuedToCNameStringBuilder);
262 issuedToONameTextView.setText(issuedToONameStringBuilder);
263 issuedToUNameTextView.setText(issuedToUNameStringBuilder);
264 issuedByCNameTextView.setText(issuedByCNameStringBuilder);
265 issuedByONameTextView.setText(issuedByONameStringBuilder);
266 issuedByUNameTextView.setText(issuedByUNameStringBuilder);
267 startDateTextView.setText(startDateStringBuilder);
268 endDateTextView.setText(endDateStringBuilder);
270 // `onCreateDialog` requires the return of an alert dialog.