Add a View Source activity. https://redmine.stoutner.com/issues/64
[PrivacyBrowser.git] / 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 }