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

   1 /*
   2  * Copyright © 2016-2017 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.content.Context;
  26 import android.content.DialogInterface;
  27 import android.net.http.SslCertificate;
  28 import android.net.http.SslError;
  29 import android.os.Bundle;
  30 import android.support.annotation.NonNull;
  31 // We have to use `AppCompatDialogFragment` instead of `DialogFragment` or an error is produced on API <= 22.
  32 import android.support.v7.app.AppCompatDialogFragment;
  33 import android.text.SpannableStringBuilder;
  34 import android.text.Spanned;
  35 import android.text.style.ForegroundColorSpan;
  36 import android.view.LayoutInflater;
  37 import android.widget.TextView;
  38
  39 import com.stoutner.privacybrowser.R;
  40 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  41
  42 import java.text.DateFormat;
  43 import java.util.Date;
  44
  45 public class SslCertificateErrorDialog extends AppCompatDialogFragment {
  46
  47     private int primaryErrorInt;
  48     private String urlWithError;
  49     private String issuedToCName;
  50     private String issuedToOName;
  51     private String issuedToUName;
  52     private String issuedByCName;
  53     private String issuedByOName;
  54     private String issuedByUName;
  55     private String startDate;
  56     private String endDate;
  57
  58     public static SslCertificateErrorDialog displayDialog(SslError error) {
  59         // Get the various components of the SSL error message.
  60         int primaryErrorIntForBundle = error.getPrimaryError();
  61         String urlWithErrorForBundle = error.getUrl();
  62         SslCertificate sslCertificate = error.getCertificate();
  63         String issuedToCNameForBundle = sslCertificate.getIssuedTo().getCName();
  64         String issuedToONameForBundle = sslCertificate.getIssuedTo().getOName();
  65         String issuedToUNameForBundle = sslCertificate.getIssuedTo().getUName();
  66         String issuedByCNameForBundle = sslCertificate.getIssuedBy().getCName();
  67         String issuedByONameForBundle = sslCertificate.getIssuedBy().getOName();
  68         String issuedByUNameForBundle = sslCertificate.getIssuedBy().getUName();
  69         Date startDateForBundle = sslCertificate.getValidNotBeforeDate();
  70         Date endDateForBundle = sslCertificate.getValidNotAfterDate();
  71
  72         // Store the SSL error message components in a `Bundle`.
  73         Bundle argumentsBundle = new Bundle();
  74         argumentsBundle.putInt("PrimaryErrorInt", primaryErrorIntForBundle);
  75         argumentsBundle.putString("UrlWithError", urlWithErrorForBundle);
  76         argumentsBundle.putString("IssuedToCName", issuedToCNameForBundle);
  77         argumentsBundle.putString("IssuedToOName", issuedToONameForBundle);
  78         argumentsBundle.putString("IssuedToUName", issuedToUNameForBundle);
  79         argumentsBundle.putString("IssuedByCName", issuedByCNameForBundle);
  80         argumentsBundle.putString("IssuedByOName", issuedByONameForBundle);
  81         argumentsBundle.putString("IssuedByUName", issuedByUNameForBundle);
  82         argumentsBundle.putString("StartDate", DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDateForBundle));
  83         argumentsBundle.putString("EndDate", DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDateForBundle));
  84
  85         // Add `argumentsBundle` to this instance of `SslCertificateErrorDialog`.
  86         SslCertificateErrorDialog thisSslCertificateErrorDialog = new SslCertificateErrorDialog();
  87         thisSslCertificateErrorDialog.setArguments(argumentsBundle);
  88         return thisSslCertificateErrorDialog;
  89     }
  90
  91     @Override
  92     public void onCreate(Bundle savedInstanceState) {
  93         super.onCreate(savedInstanceState);
  94
  95         // Save the components of the SSL error message in class variables.
  96         primaryErrorInt = getArguments().getInt("PrimaryErrorInt");
  97         urlWithError = getArguments().getString("UrlWithError");
  98         issuedToCName = getArguments().getString("IssuedToCName");
  99         issuedToOName = getArguments().getString("IssuedToOName");
 100         issuedToUName = getArguments().getString("IssuedToUName");
 101         issuedByCName = getArguments().getString("IssuedByCName");
 102         issuedByOName = getArguments().getString("IssuedByOName");
 103         issuedByUName = getArguments().getString("IssuedByUName");
 104         startDate = getArguments().getString("StartDate");
 105         endDate = getArguments().getString("EndDate");
 106     }
 107
 108     // The public interface is used to send information back to the parent activity.
 109     public interface SslCertificateErrorListener {
 110         void onSslErrorCancel();
 111
 112         void onSslErrorProceed();
 113     }
 114
 115     // `sslCertificateErrorListener` is used in `onAttach` and `onCreateDialog`.
 116     private SslCertificateErrorListener sslCertificateErrorListener;
 117
 118     // Check to make sure that the parent activity implements the listener.
 119     public void onAttach(Context context) {
 120         super.onAttach(context);
 121
 122         try {
 123             sslCertificateErrorListener = (SslCertificateErrorListener) context;
 124         } catch(ClassCastException exception) {
 125             throw new ClassCastException(context.toString() + " must implement SslCertificateErrorListener");
 126         }
 127     }
 128
 129     // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the `AlertDialog`.
 130     @SuppressLint("InflateParams")
 131     @SuppressWarnings("deprecation")
 132     @Override
 133     @NonNull
 134     public Dialog onCreateDialog(Bundle savedInstanceState) {
 135         // Get the activity's layout inflater.
 136         LayoutInflater layoutInflater = getActivity().getLayoutInflater();
 137
 138         // Use `AlertDialog.Builder` to create the `AlertDialog`.
 139         AlertDialog.Builder dialogBuilder;
 140
 141         // Set the style according to the theme.
 142         if (MainWebViewActivity.darkTheme) {
 143             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogDark);
 144         } else {
 145             dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.PrivacyBrowserAlertDialogLight);
 146         }
 147
 148         // Set the title.
 149         dialogBuilder.setTitle(R.string.ssl_certificate_error);
 150
 151         // Set the view.  The parent view is `null` because it will be assigned by `AlertDialog`.
 152         dialogBuilder.setView(layoutInflater.inflate(R.layout.ssl_certificate_error, null));
 153
 154         // Set an `onClick` listener on the negative button.  `null` doesn't do anything extra when the button is pressed.  The `Dialog` will automatically close.
 155         dialogBuilder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
 156             @Override
 157             public void onClick(DialogInterface dialog, int which) {
 158                 sslCertificateErrorListener.onSslErrorCancel();
 159             }
 160         });
 161
 162         // Set an `onClick` listener on the positive button.
 163         dialogBuilder.setPositiveButton(R.string.proceed, new DialogInterface.OnClickListener() {
 164             @Override
 165             public void onClick(DialogInterface dialog, int which) {
 166                 sslCertificateErrorListener.onSslErrorProceed();
 167             }
 168         });
 169
 170
 171         // Create an `AlertDialog` from the `AlertDialog.Builder`.
 172         AlertDialog alertDialog = dialogBuilder.create();
 173
 174         // We have to show the `AlertDialog` before we can modify the content.
 175         alertDialog.show();
 176
 177         // Get handles for the `TextViews`
 178         TextView primaryErrorTextView = (TextView) alertDialog.findViewById(R.id.primary_error);
 179         TextView urlTextView = (TextView) alertDialog.findViewById(R.id.url_error_dialog);
 180         TextView issuedToCNameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_cname_error_dialog);
 181         TextView issuedToONameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_oname_error_dialog);
 182         TextView issuedToUNameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_uname_error_dialog);
 183         TextView issuedByTextView = (TextView) alertDialog.findViewById(R.id.issued_by_textview);
 184         TextView issuedByCNameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_cname_error_dialog);
 185         TextView issuedByONameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_oname_error_dialog);
 186         TextView issuedByUNameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_uname_error_dialog);
 187         TextView validDatesTextView = (TextView) alertDialog.findViewById(R.id.valid_dates_textview);
 188         TextView startDateTextView = (TextView) alertDialog.findViewById(R.id.start_date_error_dialog);
 189         TextView endDateTextView = (TextView) alertDialog.findViewById(R.id.end_date_error_dialog);
 190
 191         // Setup the common strings.
 192         String urlLabel = getString(R.string.url_label) + "  ";
 193         String cNameLabel = getString(R.string.common_name) + "  ";
 194         String oNameLabel = getString(R.string.organization) + "  ";
 195         String uNameLabel = getString(R.string.organizational_unit) + "  ";
 196         String startDateLabel = getString(R.string.start_date) + "  ";
 197         String endDateLabel = getString(R.string.end_date) + "  ";
 198
 199         // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 200         SpannableStringBuilder urlStringBuilder = new SpannableStringBuilder(urlLabel + urlWithError);
 201         SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 202         SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 203         SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 204         SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 205         SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 206         SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 207         SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + startDate);
 208         SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder((endDateLabel + endDate));
 209
 210         // Create a red `ForegroundColorSpan`.  We have to use the deprecated `getColor` until API >= 23.
 211         @SuppressWarnings("deprecation") ForegroundColorSpan redColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.red_a700));
 212
 213         // Create a blue `ForegroundColorSpan`.
 214         ForegroundColorSpan blueColorSpan;
 215
 216         // Set `blueColorSpan` according to the theme.  We have to use the deprecated `getColor()` until API >= 23.
 217         if (MainWebViewActivity.darkTheme) {
 218             //noinspection deprecation
 219             blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 220         } else {
 221             //noinspection deprecation
 222             blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 223         }
 224
 225         // Setup the spans to display the certificate information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 226         urlStringBuilder.setSpan(blueColorSpan, urlLabel.length(), urlStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 227         issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 228         issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 229         issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 230         issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 231         issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 232         issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 233         startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 234         endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 235
 236         // Initialize `primaryErrorString`.
 237         String primaryErrorString = "";
 238
 239         // Highlight the primary error in red and store the primary error string in `primaryErrorString`.
 240         switch (primaryErrorInt) {
 241             case SslError.SSL_IDMISMATCH:
 242                 // Change the URL span colors to red.
 243                 urlStringBuilder.setSpan(redColorSpan, urlLabel.length(), urlStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 244                 issuedToCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 245
 246                 // Store the primary error string.
 247                 primaryErrorString = getString(R.string.cn_mismatch);
 248                 break;
 249
 250             case SslError.SSL_UNTRUSTED:
 251                 // Change the `issuesByTextView` text to red.  We have to use the deprecated `getColor()` until API >= 23.
 252                 issuedByTextView.setTextColor(getResources().getColor(R.color.red_a700));
 253
 254                 // Change the issued by span color to red.
 255                 issuedByCNameStringBuilder.setSpan(redColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 256                 issuedByONameStringBuilder.setSpan(redColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 257                 issuedByUNameStringBuilder.setSpan(redColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 258
 259                 // Store the primary error string.
 260                 primaryErrorString = getString(R.string.untrusted);
 261                 break;
 262
 263             case SslError.SSL_DATE_INVALID:
 264                 // Change the `validDatesTextView` text to red.  We have to use the deprecated `getColor()` until API >= 23.
 265                 validDatesTextView.setTextColor(getResources().getColor(R.color.red_a700));
 266
 267                 // Change the date span colors to red.
 268                 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 269                 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 270
 271                 // Store the primary error string.
 272                 primaryErrorString = getString(R.string.invalid_date);
 273                 break;
 274
 275             case SslError.SSL_NOTYETVALID:
 276                 // Change the start date span color to red.
 277                 startDateStringBuilder.setSpan(redColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 278
 279                 // Store the primary error string.
 280                 primaryErrorString = getString(R.string.future_certificate);
 281                 break;
 282
 283             case SslError.SSL_EXPIRED:
 284                 // Change the end date span color to red.
 285                 endDateStringBuilder.setSpan(redColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 286
 287                 // Store the primary error string.
 288                 primaryErrorString = getString(R.string.expired_certificate);
 289                 break;
 290
 291             case SslError.SSL_INVALID:
 292                 // Store the primary error string.
 293                 primaryErrorString = getString(R.string.invalid_certificate);
 294                 break;
 295         }
 296
 297
 298         // Display the strings.
 299         primaryErrorTextView.setText(primaryErrorString);
 300         urlTextView.setText(urlStringBuilder);
 301         issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 302         issuedToONameTextView.setText(issuedToONameStringBuilder);
 303         issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 304         issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 305         issuedByONameTextView.setText(issuedByONameStringBuilder);
 306         issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 307         startDateTextView.setText(startDateStringBuilder);
 308         endDateTextView.setText(endDateStringBuilder);
 309
 310         // `onCreateDialog` requires the return of an `AlertDialog`.
 311         return alertDialog;
 312     }
 313 }