app/src/main/java/com/stoutner/privacybrowser/SslCertificateError.java

   1 /**
   2  * Copyright 2016 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;
  21
  22 import android.app.Activity;
  23 import android.app.AlertDialog;
  24 import android.app.Dialog;
  25 import android.app.DialogFragment;
  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.text.SpannableStringBuilder;
  31 import android.text.Spanned;
  32 import android.text.style.ForegroundColorSpan;
  33 import android.view.LayoutInflater;
  34 import android.widget.TextView;
  35
  36 import java.util.Date;
  37
  38 public class SslCertificateError extends DialogFragment{
  39
  40     private String primaryError;
  41     private String urlWithError;
  42     private String issuedToCName;
  43     private String issuedToOName;
  44     private String issuedToUName;
  45     private String issuedByCName;
  46     private String issuedByOName;
  47     private String issuedByUName;
  48     private String startDate;
  49     private String endDate;
  50
  51     public static SslCertificateError displayDialog(SslError error) {
  52         // Get the various components of the SSL error message.
  53         int primaryErrorIntForBundle = error.getPrimaryError();
  54         String urlWithErrorForBundle = error.getUrl();
  55         SslCertificate sslCertificate = error.getCertificate();
  56         String issuedToCNameForBundle = sslCertificate.getIssuedTo().getCName();
  57         String issuedToONameForBundle = sslCertificate.getIssuedTo().getOName();
  58         String issuedToUNameForBundle = sslCertificate.getIssuedTo().getUName();
  59         String issuedByCNameForBundle = sslCertificate.getIssuedBy().getCName();
  60         String issuedByONameForBundle = sslCertificate.getIssuedBy().getOName();
  61         String issuedByUNameForBundle = sslCertificate.getIssuedBy().getUName();
  62         Date startDateForBundle = sslCertificate.getValidNotBeforeDate();
  63         Date endDateForBundle = sslCertificate.getValidNotAfterDate();
  64
  65         // Store the SSL error message components in a `Bundle`.
  66         Bundle argumentsBundle = new Bundle();
  67         argumentsBundle.putInt("PrimaryErrorInt", primaryErrorIntForBundle);
  68         argumentsBundle.putString("UrlWithError", urlWithErrorForBundle);
  69         argumentsBundle.putString("IssuedToCName", issuedToCNameForBundle);
  70         argumentsBundle.putString("IssuedToOName", issuedToONameForBundle);
  71         argumentsBundle.putString("IssuedToUName", issuedToUNameForBundle);
  72         argumentsBundle.putString("IssuedByCName", issuedByCNameForBundle);
  73         argumentsBundle.putString("IssuedByOName", issuedByONameForBundle);
  74         argumentsBundle.putString("IssuedByUName", issuedByUNameForBundle);
  75         argumentsBundle.putString("StartDate", startDateForBundle.toString());
  76         argumentsBundle.putString("EndDate", endDateForBundle.toString());
  77
  78         // Add `argumentsBundle` to this instance of `SslCertificateError`.
  79         SslCertificateError thisSslCertificateErrorDialog = new SslCertificateError();
  80         thisSslCertificateErrorDialog.setArguments(argumentsBundle);
  81         return thisSslCertificateErrorDialog;
  82     }
  83
  84     @Override
  85     public void onCreate(Bundle savedInstanceState) {
  86         super.onCreate(savedInstanceState);
  87
  88         // Save the components of the SSL error message in class variables.
  89         urlWithError = getArguments().getString("UrlWithError");
  90         issuedToCName = getArguments().getString("IssuedToCName");
  91         issuedToOName = getArguments().getString("IssuedToOName");
  92         issuedToUName = getArguments().getString("IssuedToUName");
  93         issuedByCName = getArguments().getString("IssuedByCName");
  94         issuedByOName = getArguments().getString("IssuedByOName");
  95         issuedByUName = getArguments().getString("IssuedByUName");
  96         startDate = getArguments().getString("StartDate");
  97         endDate = getArguments().getString("EndDate");
  98
  99         // Get the appropriate string for `primaryError.
 100         int primaryErrorInt = getArguments().getInt("PrimaryErrorInt");
 101         switch (primaryErrorInt) {
 102             case SslError.SSL_NOTYETVALID:
 103                 primaryError = getString(R.string.future_certificate);
 104                 break;
 105
 106             case SslError.SSL_EXPIRED:
 107                 primaryError = getString(R.string.expired_certificate);
 108                 break;
 109
 110             case SslError.SSL_IDMISMATCH:
 111                 primaryError = getString(R.string.cn_mismatch);
 112                 break;
 113
 114             case SslError.SSL_UNTRUSTED:
 115                 primaryError = getString(R.string.untrusted);
 116                 break;
 117
 118             case SslError.SSL_DATE_INVALID:
 119                 primaryError = getString(R.string.invalid_date);
 120                 break;
 121
 122             case SslError.SSL_INVALID:
 123                 primaryError = getString(R.string.invalid_certificate);
 124                 break;
 125         }
 126     }
 127
 128     // The public interface is used to send information back to the parent activity.
 129     public interface SslCertificateErrorListener {
 130         void onSslErrorCancel();
 131
 132         void onSslErrorProceed();
 133     }
 134
 135     // `sslCertificateErrorListener` is used in `onAttach` and `onCreateDialog`.
 136     private SslCertificateErrorListener sslCertificateErrorListener;
 137
 138     // Check to make sure that the parent activity implements the listener.
 139     public void onAttach(Activity parentActivity) {
 140         super.onAttach(parentActivity);
 141
 142         try {
 143             sslCertificateErrorListener = (SslCertificateErrorListener) parentActivity;
 144         } catch(ClassCastException exception) {
 145             throw new ClassCastException(parentActivity.toString() + " must implement SslCertificateErrorListener");
 146         }
 147     }
 148
 149     @Override
 150     public Dialog onCreateDialog(Bundle savedInstanceState) {
 151         // Get the activity's layout inflater.
 152         LayoutInflater layoutInflater = getActivity().getLayoutInflater();
 153
 154         // Use `AlertDialog.Builder` to create the `AlertDialog`.  `R.style.LightAlertDialog` formats the color of the button text.
 155         AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.LightAlertDialog);
 156         dialogBuilder.setTitle(R.string.ssl_certificate_error);
 157         // The parent view is `null` because it will be assigned by `AlertDialog`.
 158         dialogBuilder.setView(layoutInflater.inflate(R.layout.ssl_certificate_error, null));
 159
 160         // Set an `onClick` listener on the negative button.  `null` doesn't do anything extra when the button is pressed.  The `Dialog` will automatically close.
 161         dialogBuilder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
 162             @Override
 163             public void onClick(DialogInterface dialog, int which) {
 164                 sslCertificateErrorListener.onSslErrorCancel();
 165             }
 166         });
 167
 168         // Set an `onClick` listener on the positive button.
 169         dialogBuilder.setPositiveButton(R.string.proceed, new DialogInterface.OnClickListener() {
 170             @Override
 171             public void onClick(DialogInterface dialog, int which) {
 172                 sslCertificateErrorListener.onSslErrorProceed();
 173             }
 174         });
 175
 176
 177         // Create an `AlertDialog` from the `AlertDialog.Builder`.
 178         AlertDialog alertDialog = dialogBuilder.create();
 179
 180         // We have to show the `AlertDialog` before we can modify the content.
 181         alertDialog.show();
 182
 183         // Get handles for the `TextViews`
 184         TextView primaryErrorTextView = (TextView) alertDialog.findViewById(R.id.primary_error);
 185         TextView urlTextView = (TextView) alertDialog.findViewById(R.id.url_error_dialog);
 186         TextView issuedToCNameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_cname_error_dialog);
 187         TextView issuedToONameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_oname_error_dialog);
 188         TextView issuedToUNameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_uname_error_dialog);
 189         TextView issuedByCNameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_cname_error_dialog);
 190         TextView issuedByONameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_oname_error_dialog);
 191         TextView issuedByUNameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_uname_error_dialog);
 192         TextView startDateTextView = (TextView) alertDialog.findViewById(R.id.start_date_error_dialog);
 193         TextView endDateTextView = (TextView) alertDialog.findViewById(R.id.end_date_error_dialog);
 194
 195         // Setup the common strings.
 196         String urlLabel = getString(R.string.url_label) + "  ";
 197         String cNameLabel = getString(R.string.common_name) + "  ";
 198         String oNameLabel = getString(R.string.organization) + "  ";
 199         String uNameLabel = getString(R.string.organizational_unit) + "  ";
 200         String startDateLabel = getString(R.string.start_date) + "  ";
 201         String endDateLabel = getString(R.string.end_date) + "  ";
 202
 203         // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 204         SpannableStringBuilder urlStringBuilder = new SpannableStringBuilder(urlLabel + urlWithError);
 205         SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 206         SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 207         SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 208         SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 209         SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 210         SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 211         SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + startDate);
 212         SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder((endDateLabel + endDate));
 213
 214         // Create a blue `ForegroundColorSpan`.  We have to use the deprecated `getColor` until API >= 23.
 215         ForegroundColorSpan blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue));
 216
 217         // Setup the spans to display the certificate information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 218         urlStringBuilder.setSpan(blueColorSpan, urlLabel.length(), urlStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 219         issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 220         issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 221         issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 222         issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 223         issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 224         issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 225         startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 226         endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 227
 228
 229         // Display the strings.
 230         primaryErrorTextView.setText(primaryError);
 231         urlTextView.setText(urlStringBuilder);
 232         issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 233         issuedToONameTextView.setText(issuedToONameStringBuilder);
 234         issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 235         issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 236         issuedByONameTextView.setText(issuedByONameStringBuilder);
 237         issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 238         startDateTextView.setText(startDateStringBuilder);
 239         endDateTextView.setText(endDateStringBuilder);
 240
 241         // `onCreateDialog` requires the return of an `AlertDialog`.
 242         return alertDialog;
 243     }
 244 }