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.graphics.ColorMatrixColorFilter;
  26 import android.graphics.Paint;
  27 import android.os.Build;
  28 import android.os.Bundle;
  29 import android.support.v4.app.Fragment;
  30 import android.text.SpannableStringBuilder;
  31 import android.text.Spanned;
  32 import android.text.style.ForegroundColorSpan;
  33 import android.view.LayoutInflater;
  34 import android.view.View;
  35 import android.view.ViewGroup;
  36 import android.webkit.WebView;
  37 import android.widget.TextView;
  38
  39 import com.stoutner.privacybrowser.BuildConfig;
  40 import com.stoutner.privacybrowser.R;
  41 import com.stoutner.privacybrowser.activities.MainWebViewActivity;
  42
  43 import java.io.ByteArrayInputStream;
  44 import java.io.InputStream;
  45 import java.math.BigInteger;
  46 import java.security.Principal;
  47 import java.security.cert.CertificateException;
  48 import java.security.cert.CertificateFactory;
  49 import java.security.cert.X509Certificate;
  50 import java.text.DateFormat;
  51 import java.util.Date;
  52
  53 public class AboutTabFragment extends Fragment {
  54     private int tabNumber;
  55
  56     // `AboutTabFragment.createTab` stores the tab number in the bundle arguments so it can be referenced from `onCreate()`.
  57     public static AboutTabFragment createTab(int tab) {
  58         Bundle thisTabArguments = new Bundle();
  59         thisTabArguments.putInt("Tab", tab);
  60
  61         AboutTabFragment thisTab = new AboutTabFragment();
  62         thisTab.setArguments(thisTabArguments);
  63         return thisTab;
  64     }
  65
  66     @Override
  67     public void onCreate(Bundle savedInstanceState) {
  68         super.onCreate(savedInstanceState);
  69
  70         // Store the tab number in `tabNumber`.
  71         tabNumber = getArguments().getInt("Tab");
  72     }
  73
  74     @Override
  75     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  76         View tabLayout;
  77
  78         // Load the tabs.  Tab numbers start at 0.
  79         if (tabNumber == 0) {  // Load the about tab.
  80             // 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.
  81             tabLayout = inflater.inflate(R.layout.about_tab_version, container, false);
  82
  83             // Get handles for the `TextViews`.
  84             TextView versionNumberTextView = (TextView) tabLayout.findViewById(R.id.about_version_number);
  85             TextView versionBrandTextView = (TextView) tabLayout.findViewById(R.id.about_version_brand);
  86             TextView versionManufacturerTextView = (TextView) tabLayout.findViewById(R.id.about_version_manufacturer);
  87             TextView versionModelTextView = (TextView) tabLayout.findViewById(R.id.about_version_model);
  88             TextView versionDeviceTextView = (TextView) tabLayout.findViewById(R.id.about_version_device);
  89             TextView versionBootloaderTextView = (TextView) tabLayout.findViewById(R.id.about_version_bootloader);
  90             TextView versionRadioTextView = (TextView) tabLayout.findViewById(R.id.about_version_radio);
  91             TextView versionAndroidTextView = (TextView) tabLayout.findViewById(R.id.about_version_android);
  92             TextView versionBuildTextView = (TextView) tabLayout.findViewById(R.id.about_version_build);
  93             TextView versionSecurityPatchTextView = (TextView) tabLayout.findViewById(R.id.about_version_securitypatch);
  94             TextView versionWebKitTextView = (TextView) tabLayout.findViewById(R.id.about_version_webkit);
  95             TextView versionChromeTextView = (TextView) tabLayout.findViewById(R.id.about_version_chrome);
  96             TextView versionOrbotTextView = (TextView) tabLayout.findViewById(R.id.about_version_orbot);
  97             TextView certificateIssuerDNTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_issuer_dn);
  98             TextView certificateSubjectDNTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_subject_dn);
  99             TextView certificateStartDateTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_start_date);
 100             TextView certificateEndDateTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_end_date);
 101             TextView certificateVersionTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_version);
 102             TextView certificateSerialNumberTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_serial_number);
 103             TextView certificateSignatureAlgorithmTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_signature_algorithm);
 104
 105             // Setup the labels.
 106             String version = getString(R.string.version) + " " + BuildConfig.VERSION_NAME + " (" + getString(R.string.version_code) + " " + Integer.toString(BuildConfig.VERSION_CODE) + ")";
 107             String brandLabel = getString(R.string.brand) + "  ";
 108             String manufacturerLabel = getString(R.string.manufacturer) + "  ";
 109             String modelLabel = getString(R.string.model) + "  ";
 110             String deviceLabel = getString(R.string.device) + "  ";
 111             String bootloaderLabel = getString(R.string.bootloader) + "  ";
 112             String androidLabel = getString(R.string.android) + "  ";
 113             String buildLabel = getString(R.string.build) + "  ";
 114             String webKitLabel = getString(R.string.webkit) + "  ";
 115             String chromeLabel = getString(R.string.chrome) + "  ";
 116             String issuerDNLabel = getString(R.string.issuer_dn) + "  ";
 117             String subjectDNLabel = getString(R.string.subject_dn) + "  ";
 118             String startDateLabel = getString(R.string.start_date) + "  ";
 119             String endDateLabel = getString(R.string.end_date) + "  ";
 120             String certificateVersionLabel = getString(R.string.certificate_version) + "  ";
 121             String serialNumberLabel = getString(R.string.serial_number) + "  ";
 122             String signatureAlgorithmLabel = getString(R.string.signature_algorithm) + "  ";
 123
 124             // `webViewLayout` is only used to get the default user agent from `bare_webview`.  It is not used to render content on the screen.
 125             View webViewLayout = inflater.inflate(R.layout.bare_webview, container, false);
 126             WebView tabLayoutWebView = (WebView) webViewLayout.findViewById(R.id.bare_webview);
 127             String userAgentString =  tabLayoutWebView.getSettings().getUserAgentString();
 128
 129             // Get the device's information and store it in strings.
 130             String brand = Build.BRAND;
 131             String manufacturer = Build.MANUFACTURER;
 132             String model = Build.MODEL;
 133             String device = Build.DEVICE;
 134             String bootloader = Build.BOOTLOADER;
 135             String radio = Build.getRadioVersion();
 136             String android = Build.VERSION.RELEASE + " (" + getString(R.string.api) + " " + Integer.toString(Build.VERSION.SDK_INT) + ")";
 137             String build = Build.DISPLAY;
 138             // Select the substring that begins after "Safari/" and goes to the end of the string.
 139             String webKit = userAgentString.substring(userAgentString.indexOf("Safari/") + 7);
 140             // Select the substring that begins after "Chrome/" and goes until the next " ".
 141             String chrome = userAgentString.substring(userAgentString.indexOf("Chrome/") + 7, userAgentString.indexOf(" ", userAgentString.indexOf("Chrome/")));
 142
 143             // Get the Orbot version name if Orbot is installed.
 144             String orbot;
 145             try {
 146                 // Store the version name.
 147                 orbot = getContext().getPackageManager().getPackageInfo("org.torproject.android", PackageManager.GET_CONFIGURATIONS).versionName;
 148             } catch (PackageManager.NameNotFoundException e) {  // Orbot is not installed.
 149                 orbot = "";
 150             }
 151
 152             // Create a `SpannableStringBuilder` for the hardware and software `TextViews` that needs multiple colors of text.
 153             SpannableStringBuilder brandStringBuilder = new SpannableStringBuilder(brandLabel + brand);
 154             SpannableStringBuilder manufacturerStringBuilder = new SpannableStringBuilder(manufacturerLabel + manufacturer);
 155             SpannableStringBuilder modelStringBuilder = new SpannableStringBuilder(modelLabel + model);
 156             SpannableStringBuilder deviceStringBuilder = new SpannableStringBuilder(deviceLabel + device);
 157             SpannableStringBuilder bootloaderStringBuilder = new SpannableStringBuilder(bootloaderLabel + bootloader);
 158             SpannableStringBuilder androidStringBuilder = new SpannableStringBuilder(androidLabel + android);
 159             SpannableStringBuilder buildStringBuilder = new SpannableStringBuilder(buildLabel + build);
 160             SpannableStringBuilder webKitStringBuilder = new SpannableStringBuilder(webKitLabel + webKit);
 161             SpannableStringBuilder chromeStringBuilder = new SpannableStringBuilder(chromeLabel + chrome);
 162
 163             // Create the `blueColorSpan` variable.
 164             ForegroundColorSpan blueColorSpan;
 165
 166             // Set `blueColorSpan` according to the theme.  We have to use the deprecated `getColor()` until API >= 23.
 167             if (MainWebViewActivity.darkTheme) {
 168                 //noinspection deprecation
 169                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 170             } else {
 171                 //noinspection deprecation
 172                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 173             }
 174
 175             // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 176             brandStringBuilder.setSpan(blueColorSpan, brandLabel.length(), brandStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 177             manufacturerStringBuilder.setSpan(blueColorSpan, manufacturerLabel.length(), manufacturerStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 178             modelStringBuilder.setSpan(blueColorSpan, modelLabel.length(), modelStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 179             deviceStringBuilder.setSpan(blueColorSpan, deviceLabel.length(), deviceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 180             bootloaderStringBuilder.setSpan(blueColorSpan, bootloaderLabel.length(), bootloaderStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 181             androidStringBuilder.setSpan(blueColorSpan, androidLabel.length(), androidStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 182             buildStringBuilder.setSpan(blueColorSpan, buildLabel.length(), buildStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 183             webKitStringBuilder.setSpan(blueColorSpan, webKitLabel.length(), webKitStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 184             chromeStringBuilder.setSpan(blueColorSpan, chromeLabel.length(), chromeStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 185
 186             // Display the strings in the text boxes.
 187             versionNumberTextView.setText(version);
 188             versionBrandTextView.setText(brandStringBuilder);
 189             versionManufacturerTextView.setText(manufacturerStringBuilder);
 190             versionModelTextView.setText(modelStringBuilder);
 191             versionDeviceTextView.setText(deviceStringBuilder);
 192             versionBootloaderTextView.setText(bootloaderStringBuilder);
 193             versionAndroidTextView.setText(androidStringBuilder);
 194             versionBuildTextView.setText(buildStringBuilder);
 195             versionWebKitTextView.setText(webKitStringBuilder);
 196             versionChromeTextView.setText(chromeStringBuilder);
 197
 198             // Build.VERSION.SECURITY_PATCH is only available for SDK_INT >= 23.
 199             if (Build.VERSION.SDK_INT >= 23) {
 200                 String securityPatchLabel = getString(R.string.security_patch) + "  ";
 201                 String securityPatch = Build.VERSION.SECURITY_PATCH;
 202                 SpannableStringBuilder securityPatchStringBuilder = new SpannableStringBuilder(securityPatchLabel + securityPatch);
 203                 securityPatchStringBuilder.setSpan(blueColorSpan, securityPatchLabel.length(), securityPatchStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 204                 versionSecurityPatchTextView.setText(securityPatchStringBuilder);
 205             } else {  // SDK_INT < 23, so `versionSecurityPatchTextView` should be hidden.
 206                 versionSecurityPatchTextView.setVisibility(View.GONE);
 207             }
 208
 209             // Only populate `versionRadioTextView` if there is a radio in the device.
 210             if (!radio.equals("")) {
 211                 String radioLabel = getString(R.string.radio) + "  ";
 212                 SpannableStringBuilder radioStringBuilder = new SpannableStringBuilder(radioLabel + radio);
 213                 radioStringBuilder.setSpan(blueColorSpan, radioLabel.length(), radioStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 214                 versionRadioTextView.setText(radioStringBuilder);
 215             } else {  // This device does not have a radio, so `versionRadioTextView` should be hidden.
 216                 versionRadioTextView.setVisibility(View.GONE);
 217             }
 218
 219             // Only populate `versionOrbotTextView` if Orbot is installed.
 220             if (!orbot.equals("")) {
 221                 String orbotLabel = getString(R.string.orbot) + "  ";
 222                 SpannableStringBuilder orbotStringBuilder = new SpannableStringBuilder(orbotLabel + orbot);
 223                 orbotStringBuilder.setSpan(blueColorSpan, orbotLabel.length(), orbotStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 224                 versionOrbotTextView.setText(orbotStringBuilder);
 225             } else {  // Orbot is not installed, so the `versionOrbotTextView` should be hidden.
 226                 versionOrbotTextView.setVisibility(View.GONE);
 227             }
 228
 229             // Display the package signature.
 230             try {
 231                 // Get the first package signature.  Suppress the lint warning about the need to be careful in implementing comparison of certificates for security purposes.
 232                 @SuppressLint("PackageManagerGetSignatures") Signature packageSignature = getContext().getPackageManager().getPackageInfo(getContext().getPackageName(), PackageManager.GET_SIGNATURES).signatures[0];
 233
 234                 // Convert the signature to a `byte[]` `InputStream`.
 235                 InputStream certificateByteArrayInputStream = new ByteArrayInputStream(packageSignature.toByteArray());
 236
 237                 // Display the certificate information on the screen.
 238                 try {
 239                     // Instantiate a `CertificateFactory`.
 240                     CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
 241
 242                     // Generate an `X509Certificate`.
 243                     X509Certificate x509Certificate = (X509Certificate) certificateFactory.generateCertificate(certificateByteArrayInputStream);
 244
 245                     // Store the individual sections of the certificate that we are interested in.
 246                     Principal issuerDNPrincipal = x509Certificate.getIssuerDN();
 247                     Principal subjectDNPrincipal = x509Certificate.getSubjectDN();
 248                     Date startDate = x509Certificate.getNotBefore();
 249                     Date endDate = x509Certificate.getNotAfter();
 250                     int certificateVersion = x509Certificate.getVersion();
 251                     BigInteger serialNumberBigInteger = x509Certificate.getSerialNumber();
 252                     String signatureAlgorithmNameString = x509Certificate.getSigAlgName();
 253
 254                     // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 255                     SpannableStringBuilder issuerDNStringBuilder = new SpannableStringBuilder(issuerDNLabel + issuerDNPrincipal.toString());
 256                     SpannableStringBuilder subjectDNStringBuilder = new SpannableStringBuilder(subjectDNLabel + subjectDNPrincipal.toString());
 257                     SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 258                     SpannableStringBuilder endDataStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 259                     SpannableStringBuilder certificateVersionStringBuilder = new SpannableStringBuilder(certificateVersionLabel + certificateVersion);
 260                     SpannableStringBuilder serialNumberStringBuilder = new SpannableStringBuilder(serialNumberLabel + serialNumberBigInteger);
 261                     SpannableStringBuilder signatureAlgorithmStringBuilder = new SpannableStringBuilder(signatureAlgorithmLabel + signatureAlgorithmNameString);
 262
 263                     // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 264                     issuerDNStringBuilder.setSpan(blueColorSpan, issuerDNLabel.length(), issuerDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 265                     subjectDNStringBuilder.setSpan(blueColorSpan, subjectDNLabel.length(), subjectDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 266                     startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 267                     endDataStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDataStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 268                     certificateVersionStringBuilder.setSpan(blueColorSpan, certificateVersionLabel.length(), certificateVersionStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 269                     serialNumberStringBuilder.setSpan(blueColorSpan, serialNumberLabel.length(), serialNumberStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 270                     signatureAlgorithmStringBuilder.setSpan(blueColorSpan, signatureAlgorithmLabel.length(), signatureAlgorithmStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 271
 272                     // Display the strings in the text boxes.
 273                     certificateIssuerDNTextView.setText(issuerDNStringBuilder);
 274                     certificateSubjectDNTextView.setText(subjectDNStringBuilder);
 275                     certificateStartDateTextView.setText(startDateStringBuilder);
 276                     certificateEndDateTextView.setText(endDataStringBuilder);
 277                     certificateVersionTextView.setText(certificateVersionStringBuilder);
 278                     certificateSerialNumberTextView.setText(serialNumberStringBuilder);
 279                     certificateSignatureAlgorithmTextView.setText(signatureAlgorithmStringBuilder);
 280                 } catch (CertificateException e) {
 281                     // Do nothing if there is a certificate error.
 282                 }
 283             } catch (PackageManager.NameNotFoundException e) {
 284                 // Do nothing if `PackageManager` says Privacy Browser isn't installed.
 285             }
 286         } else { // load a WebView for all the other tabs.  Tab numbers start at 0.
 287             // 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.
 288             tabLayout = inflater.inflate(R.layout.bare_webview, container, false);
 289
 290             // Get a handle for `tabWebView`.
 291             WebView tabWebView = (WebView) tabLayout;
 292
 293             // Filter the colors if `darkTheme` is `true`.
 294             if (MainWebViewActivity.darkTheme) {
 295                 // Initialize `darkPaint`.
 296                 Paint darkPaint = new Paint();
 297
 298                 // Setup a float array that inverts and tempers the colors (no hard whites or blacks).
 299                 float[] darkFilterFloatArray = {
 300                         -.8f, 0, 0, 0, 255,  // Red.
 301                         0, -.8f, 0, 0, 255,  // Green.
 302                         0, 0, -.8f, 0, 255,  // Blue.
 303                         0, 0, 0, .8f, 0      // Alpha.
 304                 };
 305
 306                 // Set `darkPaint` to use `darkFilterFloatArray`.
 307                 darkPaint.setColorFilter(new ColorMatrixColorFilter(darkFilterFloatArray));
 308
 309                 // Apply `darkPaint` to `tabWebView`.
 310                 tabWebView.setLayerType(View.LAYER_TYPE_HARDWARE, darkPaint);
 311             } else {
 312                 // Reset `tabWebView` to use the normal colors.
 313                 tabWebView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
 314             }
 315
 316             switch (tabNumber) {
 317                 case 1:
 318                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions.html");
 319                     break;
 320
 321                 case 2:
 322                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy.html");
 323                     break;
 324
 325                 case 3:
 326                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog.html");
 327                     break;
 328
 329                 case 4:
 330                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses.html");
 331                     break;
 332
 333                 case 5:
 334                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors.html");
 335                     break;
 336
 337                 case 6:
 338                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links.html");
 339                     break;
 340
 341                 default:
 342                     break;
 343             }
 344         }
 345
 346         return tabLayout;
 347     }
 348 }