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 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  40
  41 import java.io.ByteArrayInputStream;
  42 import java.io.InputStream;
  43 import java.math.BigInteger;
  44 import java.security.Principal;
  45 import java.security.cert.CertificateException;
  46 import java.security.cert.CertificateFactory;
  47 import java.security.cert.X509Certificate;
  48 import java.text.DateFormat;
  49 import java.util.Date;
  50
  51 public class AboutTabFragment extends Fragment {
  52     private int tabNumber;
  53
  54     // Store the tab number in the arguments bundle.
  55     public static AboutTabFragment createTab(int tab) {
  56         // Create a bundle.
  57         Bundle bundle = new Bundle();
  58
  59         // Store the tab number in the bundle.
  60         bundle.putInt("Tab", tab);
  61
  62         // Add the bundle to the fragment.
  63         AboutTabFragment aboutTabFragment = new AboutTabFragment();
  64         aboutTabFragment.setArguments(bundle);
  65
  66         // Return the new fragment.
  67         return aboutTabFragment;
  68     }
  69
  70     @Override
  71     public void onCreate(Bundle savedInstanceState) {
  72         // Run the default commands.
  73         super.onCreate(savedInstanceState);
  74
  75         // Store the tab number in a class variable.
  76         tabNumber = getArguments().getInt("Tab");
  77     }
  78
  79     @Override
  80     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  81         View tabLayout;
  82
  83         // Load the tabs.  Tab numbers start at 0.
  84         if (tabNumber == 0) {  // Load the about tab.
  85             // Setting false at the end of inflater.inflate does not attach the inflated layout as a child of container.  The fragment will take care of attaching the root automatically.
  86             tabLayout = inflater.inflate(R.layout.about_tab_version, container, false);
  87
  88             // Get handles for the `TextViews`.
  89             TextView versionNumberTextView = tabLayout.findViewById(R.id.about_version_number);
  90             TextView versionBrandTextView = tabLayout.findViewById(R.id.about_version_brand);
  91             TextView versionManufacturerTextView = tabLayout.findViewById(R.id.about_version_manufacturer);
  92             TextView versionModelTextView = tabLayout.findViewById(R.id.about_version_model);
  93             TextView versionDeviceTextView = tabLayout.findViewById(R.id.about_version_device);
  94             TextView versionBootloaderTextView = tabLayout.findViewById(R.id.about_version_bootloader);
  95             TextView versionRadioTextView = tabLayout.findViewById(R.id.about_version_radio);
  96             TextView versionAndroidTextView = tabLayout.findViewById(R.id.about_version_android);
  97             TextView versionSecurityPatchTextView = tabLayout.findViewById(R.id.about_version_securitypatch);
  98             TextView versionBuildTextView = tabLayout.findViewById(R.id.about_version_build);
  99             TextView versionWebKitTextView = tabLayout.findViewById(R.id.about_version_webkit);
 100             TextView versionChromeTextView = tabLayout.findViewById(R.id.about_version_chrome);
 101             TextView versionOrbotTextView = tabLayout.findViewById(R.id.about_version_orbot);
 102             TextView certificateIssuerDNTextView = tabLayout.findViewById(R.id.about_version_certificate_issuer_dn);
 103             TextView certificateSubjectDNTextView = tabLayout.findViewById(R.id.about_version_certificate_subject_dn);
 104             TextView certificateStartDateTextView = tabLayout.findViewById(R.id.about_version_certificate_start_date);
 105             TextView certificateEndDateTextView = tabLayout.findViewById(R.id.about_version_certificate_end_date);
 106             TextView certificateVersionTextView = tabLayout.findViewById(R.id.about_version_certificate_version);
 107             TextView certificateSerialNumberTextView = tabLayout.findViewById(R.id.about_version_certificate_serial_number);
 108             TextView certificateSignatureAlgorithmTextView = tabLayout.findViewById(R.id.about_version_certificate_signature_algorithm);
 109
 110             // Setup the labels.
 111             String version = getString(R.string.version) + " " + BuildConfig.VERSION_NAME + " (" + getString(R.string.version_code) + " " + Integer.toString(BuildConfig.VERSION_CODE) + ")";
 112             String brandLabel = getString(R.string.brand) + "  ";
 113             String manufacturerLabel = getString(R.string.manufacturer) + "  ";
 114             String modelLabel = getString(R.string.model) + "  ";
 115             String deviceLabel = getString(R.string.device) + "  ";
 116             String bootloaderLabel = getString(R.string.bootloader) + "  ";
 117             String androidLabel = getString(R.string.android) + "  ";
 118             String buildLabel = getString(R.string.build) + "  ";
 119             String webKitLabel = getString(R.string.webkit) + "  ";
 120             String chromeLabel = getString(R.string.chrome) + "  ";
 121             String issuerDNLabel = getString(R.string.issuer_dn) + "  ";
 122             String subjectDNLabel = getString(R.string.subject_dn) + "  ";
 123             String startDateLabel = getString(R.string.start_date) + "  ";
 124             String endDateLabel = getString(R.string.end_date) + "  ";
 125             String certificateVersionLabel = getString(R.string.certificate_version) + "  ";
 126             String serialNumberLabel = getString(R.string.serial_number) + "  ";
 127             String signatureAlgorithmLabel = getString(R.string.signature_algorithm) + "  ";
 128
 129             // `webViewLayout` is only used to get the default user agent from `bare_webview`.  It is not used to render content on the screen.
 130             View webViewLayout = inflater.inflate(R.layout.bare_webview, container, false);
 131             WebView tabLayoutWebView = webViewLayout.findViewById(R.id.bare_webview);
 132             String userAgentString =  tabLayoutWebView.getSettings().getUserAgentString();
 133
 134             // Get the device's information and store it in strings.
 135             String brand = Build.BRAND;
 136             String manufacturer = Build.MANUFACTURER;
 137             String model = Build.MODEL;
 138             String device = Build.DEVICE;
 139             String bootloader = Build.BOOTLOADER;
 140             String radio = Build.getRadioVersion();
 141             String android = Build.VERSION.RELEASE + " (" + getString(R.string.api) + " " + Integer.toString(Build.VERSION.SDK_INT) + ")";
 142             String build = Build.DISPLAY;
 143             // Select the substring that begins after "Safari/" and goes to the end of the string.
 144             String webKit = userAgentString.substring(userAgentString.indexOf("Safari/") + 7);
 145             // Select the substring that begins after "Chrome/" and goes until the next " ".
 146             String chrome = userAgentString.substring(userAgentString.indexOf("Chrome/") + 7, userAgentString.indexOf(" ", userAgentString.indexOf("Chrome/")));
 147
 148             // Get the Orbot version name if Orbot is installed.
 149             String orbot;
 150             try {
 151                 // Store the version name.
 152                 orbot = getContext().getPackageManager().getPackageInfo("org.torproject.android", PackageManager.GET_CONFIGURATIONS).versionName;
 153             } catch (PackageManager.NameNotFoundException e) {  // Orbot is not installed.
 154                 orbot = "";
 155             }
 156
 157             // Create a `SpannableStringBuilder` for the hardware and software `TextViews` that needs multiple colors of text.
 158             SpannableStringBuilder brandStringBuilder = new SpannableStringBuilder(brandLabel + brand);
 159             SpannableStringBuilder manufacturerStringBuilder = new SpannableStringBuilder(manufacturerLabel + manufacturer);
 160             SpannableStringBuilder modelStringBuilder = new SpannableStringBuilder(modelLabel + model);
 161             SpannableStringBuilder deviceStringBuilder = new SpannableStringBuilder(deviceLabel + device);
 162             SpannableStringBuilder bootloaderStringBuilder = new SpannableStringBuilder(bootloaderLabel + bootloader);
 163             SpannableStringBuilder androidStringBuilder = new SpannableStringBuilder(androidLabel + android);
 164             SpannableStringBuilder buildStringBuilder = new SpannableStringBuilder(buildLabel + build);
 165             SpannableStringBuilder webKitStringBuilder = new SpannableStringBuilder(webKitLabel + webKit);
 166             SpannableStringBuilder chromeStringBuilder = new SpannableStringBuilder(chromeLabel + chrome);
 167
 168             // Create the `blueColorSpan` variable.
 169             ForegroundColorSpan blueColorSpan;
 170
 171             // Set `blueColorSpan` according to the theme.  We have to use the deprecated `getColor()` until API >= 23.
 172             if (MainWebViewActivity.darkTheme) {
 173                 //noinspection deprecation
 174                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 175             } else {
 176                 //noinspection deprecation
 177                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 178             }
 179
 180             // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 181             brandStringBuilder.setSpan(blueColorSpan, brandLabel.length(), brandStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 182             manufacturerStringBuilder.setSpan(blueColorSpan, manufacturerLabel.length(), manufacturerStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 183             modelStringBuilder.setSpan(blueColorSpan, modelLabel.length(), modelStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 184             deviceStringBuilder.setSpan(blueColorSpan, deviceLabel.length(), deviceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 185             bootloaderStringBuilder.setSpan(blueColorSpan, bootloaderLabel.length(), bootloaderStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 186             androidStringBuilder.setSpan(blueColorSpan, androidLabel.length(), androidStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 187             buildStringBuilder.setSpan(blueColorSpan, buildLabel.length(), buildStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 188             webKitStringBuilder.setSpan(blueColorSpan, webKitLabel.length(), webKitStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 189             chromeStringBuilder.setSpan(blueColorSpan, chromeLabel.length(), chromeStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 190
 191             // Display the strings in the text boxes.
 192             versionNumberTextView.setText(version);
 193             versionBrandTextView.setText(brandStringBuilder);
 194             versionManufacturerTextView.setText(manufacturerStringBuilder);
 195             versionModelTextView.setText(modelStringBuilder);
 196             versionDeviceTextView.setText(deviceStringBuilder);
 197             versionBootloaderTextView.setText(bootloaderStringBuilder);
 198             versionAndroidTextView.setText(androidStringBuilder);
 199             versionBuildTextView.setText(buildStringBuilder);
 200             versionWebKitTextView.setText(webKitStringBuilder);
 201             versionChromeTextView.setText(chromeStringBuilder);
 202
 203             // Build.VERSION.SECURITY_PATCH is only available for SDK_INT >= 23.
 204             if (Build.VERSION.SDK_INT >= 23) {
 205                 String securityPatchLabel = getString(R.string.security_patch) + "  ";
 206                 String securityPatch = Build.VERSION.SECURITY_PATCH;
 207                 SpannableStringBuilder securityPatchStringBuilder = new SpannableStringBuilder(securityPatchLabel + securityPatch);
 208                 securityPatchStringBuilder.setSpan(blueColorSpan, securityPatchLabel.length(), securityPatchStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 209                 versionSecurityPatchTextView.setText(securityPatchStringBuilder);
 210             } else {  // SDK_INT < 23, so `versionSecurityPatchTextView` should be hidden.
 211                 versionSecurityPatchTextView.setVisibility(View.GONE);
 212             }
 213
 214             // Only populate `versionRadioTextView` if there is a radio in the device.
 215             if (!radio.equals("")) {
 216                 String radioLabel = getString(R.string.radio) + "  ";
 217                 SpannableStringBuilder radioStringBuilder = new SpannableStringBuilder(radioLabel + radio);
 218                 radioStringBuilder.setSpan(blueColorSpan, radioLabel.length(), radioStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 219                 versionRadioTextView.setText(radioStringBuilder);
 220             } else {  // This device does not have a radio, so `versionRadioTextView` should be hidden.
 221                 versionRadioTextView.setVisibility(View.GONE);
 222             }
 223
 224             // Only populate `versionOrbotTextView` if Orbot is installed.
 225             if (!orbot.equals("")) {
 226                 String orbotLabel = getString(R.string.orbot) + "  ";
 227                 SpannableStringBuilder orbotStringBuilder = new SpannableStringBuilder(orbotLabel + orbot);
 228                 orbotStringBuilder.setSpan(blueColorSpan, orbotLabel.length(), orbotStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 229                 versionOrbotTextView.setText(orbotStringBuilder);
 230             } else {  // Orbot is not installed, so the `versionOrbotTextView` should be hidden.
 231                 versionOrbotTextView.setVisibility(View.GONE);
 232             }
 233
 234             // Display the package signature.
 235             try {
 236                 // Get the first package signature.  Suppress the lint warning about the need to be careful in implementing comparison of certificates for security purposes.
 237                 @SuppressLint("PackageManagerGetSignatures") Signature packageSignature = getContext().getPackageManager().getPackageInfo(getContext().getPackageName(), PackageManager.GET_SIGNATURES).signatures[0];
 238
 239                 // Convert the signature to a `byte[]` `InputStream`.
 240                 InputStream certificateByteArrayInputStream = new ByteArrayInputStream(packageSignature.toByteArray());
 241
 242                 // Display the certificate information on the screen.
 243                 try {
 244                     // Instantiate a `CertificateFactory`.
 245                     CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
 246
 247                     // Generate an `X509Certificate`.
 248                     X509Certificate x509Certificate = (X509Certificate) certificateFactory.generateCertificate(certificateByteArrayInputStream);
 249
 250                     // Store the individual sections of the certificate that we are interested in.
 251                     Principal issuerDNPrincipal = x509Certificate.getIssuerDN();
 252                     Principal subjectDNPrincipal = x509Certificate.getSubjectDN();
 253                     Date startDate = x509Certificate.getNotBefore();
 254                     Date endDate = x509Certificate.getNotAfter();
 255                     int certificateVersion = x509Certificate.getVersion();
 256                     BigInteger serialNumberBigInteger = x509Certificate.getSerialNumber();
 257                     String signatureAlgorithmNameString = x509Certificate.getSigAlgName();
 258
 259                     // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 260                     SpannableStringBuilder issuerDNStringBuilder = new SpannableStringBuilder(issuerDNLabel + issuerDNPrincipal.toString());
 261                     SpannableStringBuilder subjectDNStringBuilder = new SpannableStringBuilder(subjectDNLabel + subjectDNPrincipal.toString());
 262                     SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 263                     SpannableStringBuilder endDataStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 264                     SpannableStringBuilder certificateVersionStringBuilder = new SpannableStringBuilder(certificateVersionLabel + certificateVersion);
 265                     SpannableStringBuilder serialNumberStringBuilder = new SpannableStringBuilder(serialNumberLabel + serialNumberBigInteger);
 266                     SpannableStringBuilder signatureAlgorithmStringBuilder = new SpannableStringBuilder(signatureAlgorithmLabel + signatureAlgorithmNameString);
 267
 268                     // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 269                     issuerDNStringBuilder.setSpan(blueColorSpan, issuerDNLabel.length(), issuerDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 270                     subjectDNStringBuilder.setSpan(blueColorSpan, subjectDNLabel.length(), subjectDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 271                     startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 272                     endDataStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDataStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 273                     certificateVersionStringBuilder.setSpan(blueColorSpan, certificateVersionLabel.length(), certificateVersionStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 274                     serialNumberStringBuilder.setSpan(blueColorSpan, serialNumberLabel.length(), serialNumberStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 275                     signatureAlgorithmStringBuilder.setSpan(blueColorSpan, signatureAlgorithmLabel.length(), signatureAlgorithmStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 276
 277                     // Display the strings in the text boxes.
 278                     certificateIssuerDNTextView.setText(issuerDNStringBuilder);
 279                     certificateSubjectDNTextView.setText(subjectDNStringBuilder);
 280                     certificateStartDateTextView.setText(startDateStringBuilder);
 281                     certificateEndDateTextView.setText(endDataStringBuilder);
 282                     certificateVersionTextView.setText(certificateVersionStringBuilder);
 283                     certificateSerialNumberTextView.setText(serialNumberStringBuilder);
 284                     certificateSignatureAlgorithmTextView.setText(signatureAlgorithmStringBuilder);
 285                 } catch (CertificateException e) {
 286                     // Do nothing if there is a certificate error.
 287                 }
 288             } catch (PackageManager.NameNotFoundException e) {
 289                 // Do nothing if `PackageManager` says Privacy Browser isn't installed.
 290             }
 291         } else { // load a `WebView` for all the other tabs.  Tab numbers start at 0.
 292             // Setting false at the end of inflater.inflate does not attach the inflated layout as a child of container.  The fragment will take care of attaching the root automatically.
 293             tabLayout = inflater.inflate(R.layout.bare_webview, container, false);
 294
 295             // Get a handle for `tabWebView`.
 296             WebView tabWebView = (WebView) tabLayout;
 297
 298             // Load the tabs according to the theme.
 299             if (MainWebViewActivity.darkTheme) {  // The dark theme is applied.
 300                 // Set the background color.  We have to use the deprecated `.getColor()` until API >= 23.
 301                 //noinspection deprecation
 302                 tabWebView.setBackgroundColor(getResources().getColor(R.color.gray_850));
 303
 304                 switch (tabNumber) {
 305                     case 1:
 306                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions_dark.html");
 307                         break;
 308
 309                     case 2:
 310                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy_dark.html");
 311                         break;
 312
 313                     case 3:
 314                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog_dark.html");
 315                         break;
 316
 317                     case 4:
 318                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses_dark.html");
 319                         break;
 320
 321                     case 5:
 322                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors_dark.html");
 323                         break;
 324
 325                     case 6:
 326                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links_dark.html");
 327                         break;
 328                 }
 329             } else {  // The light theme is applied.
 330                 switch (tabNumber) {
 331                     case 1:
 332                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions_light.html");
 333                         break;
 334
 335                     case 2:
 336                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy_light.html");
 337                         break;
 338
 339                     case 3:
 340                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog_light.html");
 341                         break;
 342
 343                     case 4:
 344                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses_light.html");
 345                         break;
 346
 347                     case 5:
 348                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors_light.html");
 349                         break;
 350
 351                     case 6:
 352                         tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links_light.html");
 353                         break;
 354                 }
 355             }
 356         }
 357
 358         // Return the formatted `tabLayout`.
 359         return tabLayout;
 360     }
 361 }