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