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
  41 import java.text.DateFormat;
  42 import java.util.Date;
  43
  44 public class SslCertificateErrorDialog extends AppCompatDialogFragment {
  45
  46     private String primaryError;
  47     private String urlWithError;
  48     private String issuedToCName;
  49     private String issuedToOName;
  50     private String issuedToUName;
  51     private String issuedByCName;
  52     private String issuedByOName;
  53     private String issuedByUName;
  54     private String startDate;
  55     private String endDate;
  56
  57     public static SslCertificateErrorDialog displayDialog(SslError error) {
  58         // Get the various components of the SSL error message.
  59         int primaryErrorIntForBundle = error.getPrimaryError();
  60         String urlWithErrorForBundle = error.getUrl();
  61         SslCertificate sslCertificate = error.getCertificate();
  62         String issuedToCNameForBundle = sslCertificate.getIssuedTo().getCName();
  63         String issuedToONameForBundle = sslCertificate.getIssuedTo().getOName();
  64         String issuedToUNameForBundle = sslCertificate.getIssuedTo().getUName();
  65         String issuedByCNameForBundle = sslCertificate.getIssuedBy().getCName();
  66         String issuedByONameForBundle = sslCertificate.getIssuedBy().getOName();
  67         String issuedByUNameForBundle = sslCertificate.getIssuedBy().getUName();
  68         Date startDateForBundle = sslCertificate.getValidNotBeforeDate();
  69         Date endDateForBundle = sslCertificate.getValidNotAfterDate();
  70
  71         // Store the SSL error message components in a `Bundle`.
  72         Bundle argumentsBundle = new Bundle();
  73         argumentsBundle.putInt("PrimaryErrorInt", primaryErrorIntForBundle);
  74         argumentsBundle.putString("UrlWithError", urlWithErrorForBundle);
  75         argumentsBundle.putString("IssuedToCName", issuedToCNameForBundle);
  76         argumentsBundle.putString("IssuedToOName", issuedToONameForBundle);
  77         argumentsBundle.putString("IssuedToUName", issuedToUNameForBundle);
  78         argumentsBundle.putString("IssuedByCName", issuedByCNameForBundle);
  79         argumentsBundle.putString("IssuedByOName", issuedByONameForBundle);
  80         argumentsBundle.putString("IssuedByUName", issuedByUNameForBundle);
  81         argumentsBundle.putString("StartDate", DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDateForBundle));
  82         argumentsBundle.putString("EndDate", DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDateForBundle));
  83
  84         // Add `argumentsBundle` to this instance of `SslCertificateErrorDialog`.
  85         SslCertificateErrorDialog thisSslCertificateErrorDialog = new SslCertificateErrorDialog();
  86         thisSslCertificateErrorDialog.setArguments(argumentsBundle);
  87         return thisSslCertificateErrorDialog;
  88     }
  89
  90     @Override
  91     public void onCreate(Bundle savedInstanceState) {
  92         super.onCreate(savedInstanceState);
  93
  94         // Save the components of the SSL error message in class variables.
  95         urlWithError = getArguments().getString("UrlWithError");
  96         issuedToCName = getArguments().getString("IssuedToCName");
  97         issuedToOName = getArguments().getString("IssuedToOName");
  98         issuedToUName = getArguments().getString("IssuedToUName");
  99         issuedByCName = getArguments().getString("IssuedByCName");
 100         issuedByOName = getArguments().getString("IssuedByOName");
 101         issuedByUName = getArguments().getString("IssuedByUName");
 102         startDate = getArguments().getString("StartDate");
 103         endDate = getArguments().getString("EndDate");
 104
 105         // Get the appropriate string for `primaryError.
 106         int primaryErrorInt = getArguments().getInt("PrimaryErrorInt");
 107         switch (primaryErrorInt) {
 108             case SslError.SSL_NOTYETVALID:
 109                 primaryError = getString(R.string.future_certificate);
 110                 break;
 111
 112             case SslError.SSL_EXPIRED:
 113                 primaryError = getString(R.string.expired_certificate);
 114                 break;
 115
 116             case SslError.SSL_IDMISMATCH:
 117                 primaryError = getString(R.string.cn_mismatch);
 118                 break;
 119
 120             case SslError.SSL_UNTRUSTED:
 121                 primaryError = getString(R.string.untrusted);
 122                 break;
 123
 124             case SslError.SSL_DATE_INVALID:
 125                 primaryError = getString(R.string.invalid_date);
 126                 break;
 127
 128             case SslError.SSL_INVALID:
 129                 primaryError = getString(R.string.invalid_certificate);
 130                 break;
 131         }
 132     }
 133
 134     // The public interface is used to send information back to the parent activity.
 135     public interface SslCertificateErrorListener {
 136         void onSslErrorCancel();
 137
 138         void onSslErrorProceed();
 139     }
 140
 141     // `sslCertificateErrorListener` is used in `onAttach` and `onCreateDialog`.
 142     private SslCertificateErrorListener sslCertificateErrorListener;
 143
 144     // Check to make sure that the parent activity implements the listener.
 145     public void onAttach(Context context) {
 146         super.onAttach(context);
 147
 148         try {
 149             sslCertificateErrorListener = (SslCertificateErrorListener) context;
 150         } catch(ClassCastException exception) {
 151             throw new ClassCastException(context.toString() + " must implement SslCertificateErrorListener");
 152         }
 153     }
 154
 155     // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the `AlertDialog`.
 156     @SuppressLint("InflateParams")
 157     @Override
 158     @NonNull
 159     public Dialog onCreateDialog(Bundle savedInstanceState) {
 160         // Get the activity's layout inflater.
 161         LayoutInflater layoutInflater = getActivity().getLayoutInflater();
 162
 163         // Use `AlertDialog.Builder` to create the `AlertDialog`.  `R.style.LightAlertDialog` formats the color of the button text.
 164         AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.LightAlertDialog);
 165         dialogBuilder.setTitle(R.string.ssl_certificate_error);
 166         // The parent view is `null` because it will be assigned by `AlertDialog`.
 167         dialogBuilder.setView(layoutInflater.inflate(R.layout.ssl_certificate_error, null));
 168
 169         // Set an `onClick` listener on the negative button.  `null` doesn't do anything extra when the button is pressed.  The `Dialog` will automatically close.
 170         dialogBuilder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
 171             @Override
 172             public void onClick(DialogInterface dialog, int which) {
 173                 sslCertificateErrorListener.onSslErrorCancel();
 174             }
 175         });
 176
 177         // Set an `onClick` listener on the positive button.
 178         dialogBuilder.setPositiveButton(R.string.proceed, new DialogInterface.OnClickListener() {
 179             @Override
 180             public void onClick(DialogInterface dialog, int which) {
 181                 sslCertificateErrorListener.onSslErrorProceed();
 182             }
 183         });
 184
 185
 186         // Create an `AlertDialog` from the `AlertDialog.Builder`.
 187         AlertDialog alertDialog = dialogBuilder.create();
 188
 189         // We have to show the `AlertDialog` before we can modify the content.
 190         alertDialog.show();
 191
 192         // Get handles for the `TextViews`
 193         TextView primaryErrorTextView = (TextView) alertDialog.findViewById(R.id.primary_error);
 194         TextView urlTextView = (TextView) alertDialog.findViewById(R.id.url_error_dialog);
 195         TextView issuedToCNameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_cname_error_dialog);
 196         TextView issuedToONameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_oname_error_dialog);
 197         TextView issuedToUNameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_uname_error_dialog);
 198         TextView issuedByCNameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_cname_error_dialog);
 199         TextView issuedByONameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_oname_error_dialog);
 200         TextView issuedByUNameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_uname_error_dialog);
 201         TextView startDateTextView = (TextView) alertDialog.findViewById(R.id.start_date_error_dialog);
 202         TextView endDateTextView = (TextView) alertDialog.findViewById(R.id.end_date_error_dialog);
 203
 204         // Setup the common strings.
 205         String urlLabel = getString(R.string.url_label) + "  ";
 206         String cNameLabel = getString(R.string.common_name) + "  ";
 207         String oNameLabel = getString(R.string.organization) + "  ";
 208         String uNameLabel = getString(R.string.organizational_unit) + "  ";
 209         String startDateLabel = getString(R.string.start_date) + "  ";
 210         String endDateLabel = getString(R.string.end_date) + "  ";
 211
 212         // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 213         SpannableStringBuilder urlStringBuilder = new SpannableStringBuilder(urlLabel + urlWithError);
 214         SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 215         SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 216         SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 217         SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 218         SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 219         SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 220         SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + startDate);
 221         SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder((endDateLabel + endDate));
 222
 223         // Create a blue `ForegroundColorSpan`.  We have to use the deprecated `getColor` until API >= 23.
 224         @SuppressWarnings("deprecation") ForegroundColorSpan blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 225
 226         // Setup the spans to display the certificate information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 227         urlStringBuilder.setSpan(blueColorSpan, urlLabel.length(), urlStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 228         issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 229         issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 230         issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 231         issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 232         issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 233         issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 234         startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 235         endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 236
 237
 238         // Display the strings.
 239         primaryErrorTextView.setText(primaryError);
 240         urlTextView.setText(urlStringBuilder);
 241         issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 242         issuedToONameTextView.setText(issuedToONameStringBuilder);
 243         issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 244         issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 245         issuedByONameTextView.setText(issuedByONameStringBuilder);
 246         issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 247         startDateTextView.setText(startDateStringBuilder);
 248         endDateTextView.setText(endDateStringBuilder);
 249
 250         // `onCreateDialog` requires the return of an `AlertDialog`.
 251         return alertDialog;
 252     }
 253 }