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