app/src/main/java/com/stoutner/privacybrowser/fragments/AboutTabFragment.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.fragments;
  21
  22 import android.annotation.SuppressLint;
  23 import android.content.pm.PackageManager;
  24 import android.content.pm.Signature;
  25 import android.os.Build;
  26 import android.os.Bundle;
  27 import android.support.v4.app.Fragment;
  28 import android.text.SpannableStringBuilder;
  29 import android.text.Spanned;
  30 import android.text.style.ForegroundColorSpan;
  31 import android.view.LayoutInflater;
  32 import android.view.View;
  33 import android.view.ViewGroup;
  34 import android.webkit.WebView;
  35 import android.widget.TextView;
  36
  37 import com.stoutner.privacybrowser.BuildConfig;
  38 import com.stoutner.privacybrowser.R;
  39
  40 import java.io.ByteArrayInputStream;
  41 import java.io.InputStream;
  42 import java.math.BigInteger;
  43 import java.security.Principal;
  44 import java.security.cert.CertificateException;
  45 import java.security.cert.CertificateFactory;
  46 import java.security.cert.X509Certificate;
  47 import java.text.DateFormat;
  48 import java.util.Date;
  49
  50 public class AboutTabFragment extends Fragment {
  51     private int tabNumber;
  52
  53     // `AboutTabFragment.createTab` stores the tab number in the bundle arguments so it can be referenced from `onCreate()`.
  54     public static AboutTabFragment createTab(int tab) {
  55         Bundle thisTabArguments = new Bundle();
  56         thisTabArguments.putInt("Tab", tab);
  57
  58         AboutTabFragment thisTab = new AboutTabFragment();
  59         thisTab.setArguments(thisTabArguments);
  60         return thisTab;
  61     }
  62
  63     @Override
  64     public void onCreate(Bundle savedInstanceState) {
  65         super.onCreate(savedInstanceState);
  66
  67         // Store the tab number in `tabNumber`.
  68         tabNumber = getArguments().getInt("Tab");
  69     }
  70
  71     @Override
  72     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  73         View tabLayout;
  74
  75         // Load the tabs.  Tab numbers start at 0.
  76         if (tabNumber == 0) {  // Load the about tab.
  77             // Setting false at the end of inflater.inflate does not attach the inflated layout as a child of container.
  78             // The fragment will take care of attaching the root automatically.
  79             tabLayout = inflater.inflate(R.layout.about_tab_version, container, false);
  80
  81             // Get handles for the `TextViews`.
  82             TextView versionNumberTextView = (TextView) tabLayout.findViewById(R.id.about_version_number);
  83             TextView versionBrandTextView = (TextView) tabLayout.findViewById(R.id.about_version_brand);
  84             TextView versionManufacturerTextView = (TextView) tabLayout.findViewById(R.id.about_version_manufacturer);
  85             TextView versionModelTextView = (TextView) tabLayout.findViewById(R.id.about_version_model);
  86             TextView versionDeviceTextView = (TextView) tabLayout.findViewById(R.id.about_version_device);
  87             TextView versionBootloaderTextView = (TextView) tabLayout.findViewById(R.id.about_version_bootloader);
  88             TextView versionRadioTextView = (TextView) tabLayout.findViewById(R.id.about_version_radio);
  89             TextView versionAndroidTextView = (TextView) tabLayout.findViewById(R.id.about_version_android);
  90             TextView versionBuildTextView = (TextView) tabLayout.findViewById(R.id.about_version_build);
  91             TextView versionSecurityPatchTextView = (TextView) tabLayout.findViewById(R.id.about_version_securitypatch);
  92             TextView versionWebKitTextView = (TextView) tabLayout.findViewById(R.id.about_version_webkit);
  93             TextView versionChromeTextView = (TextView) tabLayout.findViewById(R.id.about_version_chrome);
  94             TextView certificateIssuerDNTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_issuer_dn);
  95             TextView certificateSubjectDNTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_subject_dn);
  96             TextView certificateStartDateTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_start_date);
  97             TextView certificateEndDateTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_end_date);
  98             TextView certificateVersionTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_version);
  99             TextView certificateSerialNumberTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_serial_number);
 100             TextView certificateSignatureAlgorithmTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_signature_algorithm);
 101
 102             // Setup the labels.
 103             String version = getString(R.string.version) + " " + BuildConfig.VERSION_NAME + " (" + getString(R.string.version_code) + " " + Integer.toString(BuildConfig.VERSION_CODE) + ")";
 104             String brandLabel = getString(R.string.brand) + "  ";
 105             String manufacturerLabel = getString(R.string.manufacturer) + "  ";
 106             String modelLabel = getString(R.string.model) + "  ";
 107             String deviceLabel = getString(R.string.device) + "  ";
 108             String bootloaderLabel = getString(R.string.bootloader) + "  ";
 109             String androidLabel = getString(R.string.android) + "  ";
 110             String buildLabel = getString(R.string.build) + "  ";
 111             String webKitLabel = getString(R.string.webkit) + "  ";
 112             String chromeLabel = getString(R.string.chrome) + "  ";
 113             String issuerDNLabel = getString(R.string.issuer_dn) + "  ";
 114             String subjectDNLabel = getString(R.string.subject_dn) + "  ";
 115             String startDateLabel = getString(R.string.start_date) + "  ";
 116             String endDateLabel = getString(R.string.end_date) + "  ";
 117             String certificateVersionLabel = getString(R.string.certificate_version) + "  ";
 118             String serialNumberLabel = getString(R.string.serial_number) + "  ";
 119             String signatureAlgorithmLabel = getString(R.string.signature_algorithm) + "  ";
 120
 121             // `webViewLayout` is only used to get the default user agent from `bare_webview`.  It is not used to render content on the screen.
 122             View webViewLayout = inflater.inflate(R.layout.bare_webview, container, false);
 123             WebView tabLayoutWebView = (WebView) webViewLayout.findViewById(R.id.bare_webview);
 124             String userAgentString =  tabLayoutWebView.getSettings().getUserAgentString();
 125
 126             // Get the device's information and store it in strings.
 127             String brand = Build.BRAND;
 128             String manufacturer = Build.MANUFACTURER;
 129             String model = Build.MODEL;
 130             String device = Build.DEVICE;
 131             String bootloader = Build.BOOTLOADER;
 132             String radio = Build.getRadioVersion();
 133             String android = Build.VERSION.RELEASE + " (" + getString(R.string.api) + " " + Integer.toString(Build.VERSION.SDK_INT) + ")";
 134             String build = Build.DISPLAY;
 135             // Select the substring that begins after "Safari/" and goes to the end of the string.
 136             String webKit = userAgentString.substring(userAgentString.indexOf("Safari/") + 7);
 137             // Select the substring that begins after "Chrome/" and goes until the next " ".
 138             String chrome = userAgentString.substring(userAgentString.indexOf("Chrome/") + 7, userAgentString.indexOf(" ", userAgentString.indexOf("Chrome/")));
 139
 140             // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 141             SpannableStringBuilder brandStringBuilder = new SpannableStringBuilder(brandLabel + brand);
 142             SpannableStringBuilder manufacturerStringBuilder = new SpannableStringBuilder(manufacturerLabel + manufacturer);
 143             SpannableStringBuilder modelStringBuilder = new SpannableStringBuilder(modelLabel + model);
 144             SpannableStringBuilder deviceStringBuilder = new SpannableStringBuilder(deviceLabel + device);
 145             SpannableStringBuilder bootloaderStringBuilder = new SpannableStringBuilder(bootloaderLabel + bootloader);
 146             SpannableStringBuilder androidStringBuilder = new SpannableStringBuilder(androidLabel + android);
 147             SpannableStringBuilder buildStringBuilder = new SpannableStringBuilder(buildLabel + build);
 148             SpannableStringBuilder webKitStringBuilder = new SpannableStringBuilder(webKitLabel + webKit);
 149             SpannableStringBuilder chromeStringBuilder = new SpannableStringBuilder(chromeLabel + chrome);
 150
 151             // Create a blue `ForegroundColorSpan`.  We have to use the deprecated `getColor` until API >= 23.
 152             @SuppressWarnings("deprecation") ForegroundColorSpan blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 153
 154             // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 155             brandStringBuilder.setSpan(blueColorSpan, brandLabel.length(), brandStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 156             manufacturerStringBuilder.setSpan(blueColorSpan, manufacturerLabel.length(), manufacturerStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 157             modelStringBuilder.setSpan(blueColorSpan, modelLabel.length(), modelStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 158             deviceStringBuilder.setSpan(blueColorSpan, deviceLabel.length(), deviceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 159             bootloaderStringBuilder.setSpan(blueColorSpan, bootloaderLabel.length(), bootloaderStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 160             androidStringBuilder.setSpan(blueColorSpan, androidLabel.length(), androidStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 161             buildStringBuilder.setSpan(blueColorSpan, buildLabel.length(), buildStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 162             webKitStringBuilder.setSpan(blueColorSpan, webKitLabel.length(), webKitStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 163             chromeStringBuilder.setSpan(blueColorSpan, chromeLabel.length(), chromeStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 164
 165             // Display the strings in the text boxes.
 166             versionNumberTextView.setText(version);
 167             versionBrandTextView.setText(brandStringBuilder);
 168             versionManufacturerTextView.setText(manufacturerStringBuilder);
 169             versionModelTextView.setText(modelStringBuilder);
 170             versionDeviceTextView.setText(deviceStringBuilder);
 171             versionBootloaderTextView.setText(bootloaderStringBuilder);
 172             versionAndroidTextView.setText(androidStringBuilder);
 173             versionBuildTextView.setText(buildStringBuilder);
 174             versionWebKitTextView.setText(webKitStringBuilder);
 175             versionChromeTextView.setText(chromeStringBuilder);
 176
 177             // Build.VERSION.SECURITY_PATCH is only available for SDK_INT >= 23.
 178             if (Build.VERSION.SDK_INT >= 23) {
 179                 String securityPatchLabel = getString(R.string.security_patch) + "  ";
 180                 String securityPatch = Build.VERSION.SECURITY_PATCH;
 181                 SpannableStringBuilder securityPatchStringBuilder = new SpannableStringBuilder(securityPatchLabel + securityPatch);
 182                 securityPatchStringBuilder.setSpan(blueColorSpan, securityPatchLabel.length(), securityPatchStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 183                 versionSecurityPatchTextView.setText(securityPatchStringBuilder);
 184             } else { // Hide `versionSecurityPatchTextView`.
 185                 versionSecurityPatchTextView.setVisibility(View.GONE);
 186             }
 187
 188             // Only populate `versionRadioTextView` if there is a radio in the device.
 189             if (!radio.equals("")) {
 190                 String radioLabel = getString(R.string.radio) + "  ";
 191                 SpannableStringBuilder radioStringBuilder = new SpannableStringBuilder(radioLabel + radio);
 192                 radioStringBuilder.setSpan(blueColorSpan, radioLabel.length(), radioStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 193                 versionRadioTextView.setText(radioStringBuilder);
 194             } else { // Hide `versionRadioTextView`.
 195                 versionRadioTextView.setVisibility(View.GONE);
 196             }
 197
 198             // Display the package signature.
 199             try {
 200                 // Get the first package signature.  Suppress the lint warning about the need to be careful in implementing comparison of certificates for security purposes.
 201                 @SuppressLint("PackageManagerGetSignatures") Signature packageSignature = getContext().getPackageManager().getPackageInfo(getContext().getPackageName(), PackageManager.GET_SIGNATURES).signatures[0];
 202
 203                 // Convert the signature to a `byte[]` `InputStream`.
 204                 InputStream certificateByteArrayInputStream = new ByteArrayInputStream(packageSignature.toByteArray());
 205
 206                 // Display the certificate information on the screen.
 207                 try {
 208                     // Instantiate a `CertificateFactory`.
 209                     CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
 210
 211                     // Generate an `X509Certificate`.
 212                     X509Certificate x509Certificate = (X509Certificate) certificateFactory.generateCertificate(certificateByteArrayInputStream);
 213
 214                     // Store the individual sections of the certificate that we are interested in.
 215                     Principal issuerDNPrincipal = x509Certificate.getIssuerDN();
 216                     Principal subjectDNPrincipal = x509Certificate.getSubjectDN();
 217                     Date startDate = x509Certificate.getNotBefore();
 218                     Date endDate = x509Certificate.getNotAfter();
 219                     int certificateVersion = x509Certificate.getVersion();
 220                     BigInteger serialNumberBigInteger = x509Certificate.getSerialNumber();
 221                     String signatureAlgorithmNameString = x509Certificate.getSigAlgName();
 222
 223                     // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 224                     SpannableStringBuilder issuerDNStringBuilder = new SpannableStringBuilder(issuerDNLabel + issuerDNPrincipal.toString());
 225                     SpannableStringBuilder subjectDNStringBuilder = new SpannableStringBuilder(subjectDNLabel + subjectDNPrincipal.toString());
 226                     SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 227                     SpannableStringBuilder endDataStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 228                     SpannableStringBuilder certificateVersionStringBuilder = new SpannableStringBuilder(certificateVersionLabel + certificateVersion);
 229                     SpannableStringBuilder serialNumberStringBuilder = new SpannableStringBuilder(serialNumberLabel + serialNumberBigInteger);
 230                     SpannableStringBuilder signatureAlgorithmStringBuilder = new SpannableStringBuilder(signatureAlgorithmLabel + signatureAlgorithmNameString);
 231
 232                     // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 233                     issuerDNStringBuilder.setSpan(blueColorSpan, issuerDNLabel.length(), issuerDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 234                     subjectDNStringBuilder.setSpan(blueColorSpan, subjectDNLabel.length(), subjectDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 235                     startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 236                     endDataStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDataStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 237                     certificateVersionStringBuilder.setSpan(blueColorSpan, certificateVersionLabel.length(), certificateVersionStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 238                     serialNumberStringBuilder.setSpan(blueColorSpan, serialNumberLabel.length(), serialNumberStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 239                     signatureAlgorithmStringBuilder.setSpan(blueColorSpan, signatureAlgorithmLabel.length(), signatureAlgorithmStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 240
 241                     // Display the strings in the text boxes.
 242                     certificateIssuerDNTextView.setText(issuerDNStringBuilder);
 243                     certificateSubjectDNTextView.setText(subjectDNStringBuilder);
 244                     certificateStartDateTextView.setText(startDateStringBuilder);
 245                     certificateEndDateTextView.setText(endDataStringBuilder);
 246                     certificateVersionTextView.setText(certificateVersionStringBuilder);
 247                     certificateSerialNumberTextView.setText(serialNumberStringBuilder);
 248                     certificateSignatureAlgorithmTextView.setText(signatureAlgorithmStringBuilder);
 249                 } catch (CertificateException e) {
 250                     // Do nothing if there is a certificate error.
 251                 }
 252             } catch (PackageManager.NameNotFoundException e) {
 253                 // Do nothing if `PackageManager` says Privacy Browser isn't installed.
 254             }
 255         } else { // load a WebView for all the other tabs.  Tab numbers start at 0.
 256             // Setting false at the end of inflater.inflate does not attach the inflated layout as a child of container.
 257             // The fragment will take care of attaching the root automatically.
 258             tabLayout = inflater.inflate(R.layout.bare_webview, container, false);
 259             WebView tabWebView = (WebView) tabLayout;
 260
 261             switch (tabNumber) {
 262                 case 1:
 263                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions.html");
 264                     break;
 265
 266                 case 2:
 267                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy.html");
 268                     break;
 269
 270                 case 3:
 271                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog.html");
 272                     break;
 273
 274                 case 4:
 275                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses.html");
 276                     break;
 277
 278                 case 5:
 279                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors.html");
 280                     break;
 281
 282                 case 6:
 283                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links.html");
 284                     break;
 285
 286                 default:
 287                     break;
 288             }
 289         }
 290
 291         return tabLayout;
 292     }
 293 }