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.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 import android.support.v7.app.AppCompatDialogFragment;
  32 import android.text.SpannableStringBuilder;
  33 import android.text.Spanned;
  34 import android.text.style.ForegroundColorSpan;
  35 import android.view.LayoutInflater;
  36 import android.widget.TextView;
  37
  38 import java.util.Date;
  39
  40 public class SslCertificateError extends AppCompatDialogFragment {
  41
  42     private String primaryError;
  43     private String urlWithError;
  44     private String issuedToCName;
  45     private String issuedToOName;
  46     private String issuedToUName;
  47     private String issuedByCName;
  48     private String issuedByOName;
  49     private String issuedByUName;
  50     private String startDate;
  51     private String endDate;
  52
  53     public static SslCertificateError displayDialog(SslError error) {
  54         // Get the various components of the SSL error message.
  55         int primaryErrorIntForBundle = error.getPrimaryError();
  56         String urlWithErrorForBundle = error.getUrl();
  57         SslCertificate sslCertificate = error.getCertificate();
  58         String issuedToCNameForBundle = sslCertificate.getIssuedTo().getCName();
  59         String issuedToONameForBundle = sslCertificate.getIssuedTo().getOName();
  60         String issuedToUNameForBundle = sslCertificate.getIssuedTo().getUName();
  61         String issuedByCNameForBundle = sslCertificate.getIssuedBy().getCName();
  62         String issuedByONameForBundle = sslCertificate.getIssuedBy().getOName();
  63         String issuedByUNameForBundle = sslCertificate.getIssuedBy().getUName();
  64         Date startDateForBundle = sslCertificate.getValidNotBeforeDate();
  65         Date endDateForBundle = sslCertificate.getValidNotAfterDate();
  66
  67         // Store the SSL error message components in a `Bundle`.
  68         Bundle argumentsBundle = new Bundle();
  69         argumentsBundle.putInt("PrimaryErrorInt", primaryErrorIntForBundle);
  70         argumentsBundle.putString("UrlWithError", urlWithErrorForBundle);
  71         argumentsBundle.putString("IssuedToCName", issuedToCNameForBundle);
  72         argumentsBundle.putString("IssuedToOName", issuedToONameForBundle);
  73         argumentsBundle.putString("IssuedToUName", issuedToUNameForBundle);
  74         argumentsBundle.putString("IssuedByCName", issuedByCNameForBundle);
  75         argumentsBundle.putString("IssuedByOName", issuedByONameForBundle);
  76         argumentsBundle.putString("IssuedByUName", issuedByUNameForBundle);
  77         argumentsBundle.putString("StartDate", startDateForBundle.toString());
  78         argumentsBundle.putString("EndDate", endDateForBundle.toString());
  79
  80         // Add `argumentsBundle` to this instance of `SslCertificateError`.
  81         SslCertificateError thisSslCertificateErrorDialog = new SslCertificateError();
  82         thisSslCertificateErrorDialog.setArguments(argumentsBundle);
  83         return thisSslCertificateErrorDialog;
  84     }
  85
  86     @Override
  87     public void onCreate(Bundle savedInstanceState) {
  88         super.onCreate(savedInstanceState);
  89
  90         // Save the components of the SSL error message in class variables.
  91         urlWithError = getArguments().getString("UrlWithError");
  92         issuedToCName = getArguments().getString("IssuedToCName");
  93         issuedToOName = getArguments().getString("IssuedToOName");
  94         issuedToUName = getArguments().getString("IssuedToUName");
  95         issuedByCName = getArguments().getString("IssuedByCName");
  96         issuedByOName = getArguments().getString("IssuedByOName");
  97         issuedByUName = getArguments().getString("IssuedByUName");
  98         startDate = getArguments().getString("StartDate");
  99         endDate = getArguments().getString("EndDate");
 100
 101         // Get the appropriate string for `primaryError.
 102         int primaryErrorInt = getArguments().getInt("PrimaryErrorInt");
 103         switch (primaryErrorInt) {
 104             case SslError.SSL_NOTYETVALID:
 105                 primaryError = getString(R.string.future_certificate);
 106                 break;
 107
 108             case SslError.SSL_EXPIRED:
 109                 primaryError = getString(R.string.expired_certificate);
 110                 break;
 111
 112             case SslError.SSL_IDMISMATCH:
 113                 primaryError = getString(R.string.cn_mismatch);
 114                 break;
 115
 116             case SslError.SSL_UNTRUSTED:
 117                 primaryError = getString(R.string.untrusted);
 118                 break;
 119
 120             case SslError.SSL_DATE_INVALID:
 121                 primaryError = getString(R.string.invalid_date);
 122                 break;
 123
 124             case SslError.SSL_INVALID:
 125                 primaryError = getString(R.string.invalid_certificate);
 126                 break;
 127         }
 128     }
 129
 130     // The public interface is used to send information back to the parent activity.
 131     public interface SslCertificateErrorListener {
 132         void onSslErrorCancel();
 133
 134         void onSslErrorProceed();
 135     }
 136
 137     // `sslCertificateErrorListener` is used in `onAttach` and `onCreateDialog`.
 138     private SslCertificateErrorListener sslCertificateErrorListener;
 139
 140     // Check to make sure that the parent activity implements the listener.
 141     public void onAttach(Context context) {
 142         super.onAttach(context);
 143
 144         try {
 145             sslCertificateErrorListener = (SslCertificateErrorListener) context;
 146         } catch(ClassCastException exception) {
 147             throw new ClassCastException(context.toString() + " must implement SslCertificateErrorListener");
 148         }
 149     }
 150
 151     // `@SuppressLing("InflateParams")` removes the warning about using `null` as the parent view group when inflating the `AlertDialog`.
 152     @SuppressLint("InflateParams")
 153     @Override
 154     @NonNull
 155     public Dialog onCreateDialog(Bundle savedInstanceState) {
 156         // Get the activity's layout inflater.
 157         LayoutInflater layoutInflater = getActivity().getLayoutInflater();
 158
 159         // Use `AlertDialog.Builder` to create the `AlertDialog`.  `R.style.LightAlertDialog` formats the color of the button text.
 160         AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity(), R.style.LightAlertDialog);
 161         dialogBuilder.setTitle(R.string.ssl_certificate_error);
 162         // The parent view is `null` because it will be assigned by `AlertDialog`.
 163         dialogBuilder.setView(layoutInflater.inflate(R.layout.ssl_certificate_error, null));
 164
 165         // Set an `onClick` listener on the negative button.  `null` doesn't do anything extra when the button is pressed.  The `Dialog` will automatically close.
 166         dialogBuilder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
 167             @Override
 168             public void onClick(DialogInterface dialog, int which) {
 169                 sslCertificateErrorListener.onSslErrorCancel();
 170             }
 171         });
 172
 173         // Set an `onClick` listener on the positive button.
 174         dialogBuilder.setPositiveButton(R.string.proceed, new DialogInterface.OnClickListener() {
 175             @Override
 176             public void onClick(DialogInterface dialog, int which) {
 177                 sslCertificateErrorListener.onSslErrorProceed();
 178             }
 179         });
 180
 181
 182         // Create an `AlertDialog` from the `AlertDialog.Builder`.
 183         AlertDialog alertDialog = dialogBuilder.create();
 184
 185         // We have to show the `AlertDialog` before we can modify the content.
 186         alertDialog.show();
 187
 188         // Get handles for the `TextViews`
 189         TextView primaryErrorTextView = (TextView) alertDialog.findViewById(R.id.primary_error);
 190         TextView urlTextView = (TextView) alertDialog.findViewById(R.id.url_error_dialog);
 191         TextView issuedToCNameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_cname_error_dialog);
 192         TextView issuedToONameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_oname_error_dialog);
 193         TextView issuedToUNameTextView = (TextView) alertDialog.findViewById(R.id.issued_to_uname_error_dialog);
 194         TextView issuedByCNameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_cname_error_dialog);
 195         TextView issuedByONameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_oname_error_dialog);
 196         TextView issuedByUNameTextView = (TextView) alertDialog.findViewById(R.id.issued_by_uname_error_dialog);
 197         TextView startDateTextView = (TextView) alertDialog.findViewById(R.id.start_date_error_dialog);
 198         TextView endDateTextView = (TextView) alertDialog.findViewById(R.id.end_date_error_dialog);
 199
 200         // Setup the common strings.
 201         String urlLabel = getString(R.string.url_label) + "  ";
 202         String cNameLabel = getString(R.string.common_name) + "  ";
 203         String oNameLabel = getString(R.string.organization) + "  ";
 204         String uNameLabel = getString(R.string.organizational_unit) + "  ";
 205         String startDateLabel = getString(R.string.start_date) + "  ";
 206         String endDateLabel = getString(R.string.end_date) + "  ";
 207
 208         // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 209         SpannableStringBuilder urlStringBuilder = new SpannableStringBuilder(urlLabel + urlWithError);
 210         SpannableStringBuilder issuedToCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedToCName);
 211         SpannableStringBuilder issuedToONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedToOName);
 212         SpannableStringBuilder issuedToUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedToUName);
 213         SpannableStringBuilder issuedByCNameStringBuilder = new SpannableStringBuilder(cNameLabel + issuedByCName);
 214         SpannableStringBuilder issuedByONameStringBuilder = new SpannableStringBuilder(oNameLabel + issuedByOName);
 215         SpannableStringBuilder issuedByUNameStringBuilder = new SpannableStringBuilder(uNameLabel + issuedByUName);
 216         SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + startDate);
 217         SpannableStringBuilder endDateStringBuilder = new SpannableStringBuilder((endDateLabel + endDate));
 218
 219         // Create a blue `ForegroundColorSpan`.  We have to use the deprecated `getColor` until API >= 23.
 220         @SuppressWarnings("deprecation") ForegroundColorSpan blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 221
 222         // Setup the spans to display the certificate information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 223         urlStringBuilder.setSpan(blueColorSpan, urlLabel.length(), urlStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 224         issuedToCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedToCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 225         issuedToONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedToONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 226         issuedToUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedToUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 227         issuedByCNameStringBuilder.setSpan(blueColorSpan, cNameLabel.length(), issuedByCNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 228         issuedByONameStringBuilder.setSpan(blueColorSpan, oNameLabel.length(), issuedByONameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 229         issuedByUNameStringBuilder.setSpan(blueColorSpan, uNameLabel.length(), issuedByUNameStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 230         startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 231         endDateStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 232
 233
 234         // Display the strings.
 235         primaryErrorTextView.setText(primaryError);
 236         urlTextView.setText(urlStringBuilder);
 237         issuedToCNameTextView.setText(issuedToCNameStringBuilder);
 238         issuedToONameTextView.setText(issuedToONameStringBuilder);
 239         issuedToUNameTextView.setText(issuedToUNameStringBuilder);
 240         issuedByCNameTextView.setText(issuedByCNameStringBuilder);
 241         issuedByONameTextView.setText(issuedByONameStringBuilder);
 242         issuedByUNameTextView.setText(issuedByUNameStringBuilder);
 243         startDateTextView.setText(startDateStringBuilder);
 244         endDateTextView.setText(endDateStringBuilder);
 245
 246         // `onCreateDialog` requires the return of an `AlertDialog`.
 247         return alertDialog;
 248     }
 249 }