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             // Inflate the layout according to the theme.  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             if (MainWebViewActivity.darkTheme) {
  82                 tabLayout = inflater.inflate(R.layout.about_tab_version_dark, container, false);
  83             } else {
  84                 tabLayout = inflater.inflate(R.layout.about_tab_version_light, container, false);
  85             }
  86
  87             // Get handles for the `TextViews`.
  88             TextView versionNumberTextView = (TextView) tabLayout.findViewById(R.id.about_version_number);
  89             TextView versionBrandTextView = (TextView) tabLayout.findViewById(R.id.about_version_brand);
  90             TextView versionManufacturerTextView = (TextView) tabLayout.findViewById(R.id.about_version_manufacturer);
  91             TextView versionModelTextView = (TextView) tabLayout.findViewById(R.id.about_version_model);
  92             TextView versionDeviceTextView = (TextView) tabLayout.findViewById(R.id.about_version_device);
  93             TextView versionBootloaderTextView = (TextView) tabLayout.findViewById(R.id.about_version_bootloader);
  94             TextView versionRadioTextView = (TextView) tabLayout.findViewById(R.id.about_version_radio);
  95             TextView versionAndroidTextView = (TextView) tabLayout.findViewById(R.id.about_version_android);
  96             TextView versionBuildTextView = (TextView) tabLayout.findViewById(R.id.about_version_build);
  97             TextView versionSecurityPatchTextView = (TextView) tabLayout.findViewById(R.id.about_version_securitypatch);
  98             TextView versionWebKitTextView = (TextView) tabLayout.findViewById(R.id.about_version_webkit);
  99             TextView versionChromeTextView = (TextView) tabLayout.findViewById(R.id.about_version_chrome);
 100             TextView versionOrbotTextView = (TextView) tabLayout.findViewById(R.id.about_version_orbot);
 101             TextView certificateIssuerDNTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_issuer_dn);
 102             TextView certificateSubjectDNTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_subject_dn);
 103             TextView certificateStartDateTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_start_date);
 104             TextView certificateEndDateTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_end_date);
 105             TextView certificateVersionTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_version);
 106             TextView certificateSerialNumberTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_serial_number);
 107             TextView certificateSignatureAlgorithmTextView = (TextView) tabLayout.findViewById(R.id.about_version_certificate_signature_algorithm);
 108
 109             // Setup the labels.
 110             String version = getString(R.string.version) + " " + BuildConfig.VERSION_NAME + " (" + getString(R.string.version_code) + " " + Integer.toString(BuildConfig.VERSION_CODE) + ")";
 111             String brandLabel = getString(R.string.brand) + "  ";
 112             String manufacturerLabel = getString(R.string.manufacturer) + "  ";
 113             String modelLabel = getString(R.string.model) + "  ";
 114             String deviceLabel = getString(R.string.device) + "  ";
 115             String bootloaderLabel = getString(R.string.bootloader) + "  ";
 116             String androidLabel = getString(R.string.android) + "  ";
 117             String buildLabel = getString(R.string.build) + "  ";
 118             String webKitLabel = getString(R.string.webkit) + "  ";
 119             String chromeLabel = getString(R.string.chrome) + "  ";
 120             String issuerDNLabel = getString(R.string.issuer_dn) + "  ";
 121             String subjectDNLabel = getString(R.string.subject_dn) + "  ";
 122             String startDateLabel = getString(R.string.start_date) + "  ";
 123             String endDateLabel = getString(R.string.end_date) + "  ";
 124             String certificateVersionLabel = getString(R.string.certificate_version) + "  ";
 125             String serialNumberLabel = getString(R.string.serial_number) + "  ";
 126             String signatureAlgorithmLabel = getString(R.string.signature_algorithm) + "  ";
 127
 128             // `webViewLayout` is only used to get the default user agent from `bare_webview`.  It is not used to render content on the screen.
 129             View webViewLayout = inflater.inflate(R.layout.bare_webview, container, false);
 130             WebView tabLayoutWebView = (WebView) webViewLayout.findViewById(R.id.bare_webview);
 131             String userAgentString =  tabLayoutWebView.getSettings().getUserAgentString();
 132
 133             // Get the device's information and store it in strings.
 134             String brand = Build.BRAND;
 135             String manufacturer = Build.MANUFACTURER;
 136             String model = Build.MODEL;
 137             String device = Build.DEVICE;
 138             String bootloader = Build.BOOTLOADER;
 139             String radio = Build.getRadioVersion();
 140             String android = Build.VERSION.RELEASE + " (" + getString(R.string.api) + " " + Integer.toString(Build.VERSION.SDK_INT) + ")";
 141             String build = Build.DISPLAY;
 142             // Select the substring that begins after "Safari/" and goes to the end of the string.
 143             String webKit = userAgentString.substring(userAgentString.indexOf("Safari/") + 7);
 144             // Select the substring that begins after "Chrome/" and goes until the next " ".
 145             String chrome = userAgentString.substring(userAgentString.indexOf("Chrome/") + 7, userAgentString.indexOf(" ", userAgentString.indexOf("Chrome/")));
 146
 147             // Get the Orbot version name if Orbot is installed.
 148             String orbot;
 149             try {
 150                 // Store the version name.
 151                 orbot = getContext().getPackageManager().getPackageInfo("org.torproject.android", PackageManager.GET_CONFIGURATIONS).versionName;
 152             } catch (PackageManager.NameNotFoundException e) {  // Orbot is not installed.
 153                 orbot = "";
 154             }
 155
 156             // Create a `SpannableStringBuilder` for the hardware and software `TextViews` that needs multiple colors of text.
 157             SpannableStringBuilder brandStringBuilder = new SpannableStringBuilder(brandLabel + brand);
 158             SpannableStringBuilder manufacturerStringBuilder = new SpannableStringBuilder(manufacturerLabel + manufacturer);
 159             SpannableStringBuilder modelStringBuilder = new SpannableStringBuilder(modelLabel + model);
 160             SpannableStringBuilder deviceStringBuilder = new SpannableStringBuilder(deviceLabel + device);
 161             SpannableStringBuilder bootloaderStringBuilder = new SpannableStringBuilder(bootloaderLabel + bootloader);
 162             SpannableStringBuilder androidStringBuilder = new SpannableStringBuilder(androidLabel + android);
 163             SpannableStringBuilder buildStringBuilder = new SpannableStringBuilder(buildLabel + build);
 164             SpannableStringBuilder webKitStringBuilder = new SpannableStringBuilder(webKitLabel + webKit);
 165             SpannableStringBuilder chromeStringBuilder = new SpannableStringBuilder(chromeLabel + chrome);
 166
 167             // Create the `blueColorSpan` variable.
 168             ForegroundColorSpan blueColorSpan;
 169
 170             // Set `blueColorSpan` according to the theme.  We have to use the deprecated `getColor()` until API >= 23.
 171             if (MainWebViewActivity.darkTheme) {
 172                 //noinspection deprecation
 173                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_400));
 174             } else {
 175                 //noinspection deprecation
 176                 blueColorSpan = new ForegroundColorSpan(getResources().getColor(R.color.blue_700));
 177             }
 178
 179             // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 180             brandStringBuilder.setSpan(blueColorSpan, brandLabel.length(), brandStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 181             manufacturerStringBuilder.setSpan(blueColorSpan, manufacturerLabel.length(), manufacturerStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 182             modelStringBuilder.setSpan(blueColorSpan, modelLabel.length(), modelStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 183             deviceStringBuilder.setSpan(blueColorSpan, deviceLabel.length(), deviceStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 184             bootloaderStringBuilder.setSpan(blueColorSpan, bootloaderLabel.length(), bootloaderStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 185             androidStringBuilder.setSpan(blueColorSpan, androidLabel.length(), androidStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 186             buildStringBuilder.setSpan(blueColorSpan, buildLabel.length(), buildStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 187             webKitStringBuilder.setSpan(blueColorSpan, webKitLabel.length(), webKitStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 188             chromeStringBuilder.setSpan(blueColorSpan, chromeLabel.length(), chromeStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 189
 190             // Display the strings in the text boxes.
 191             versionNumberTextView.setText(version);
 192             versionBrandTextView.setText(brandStringBuilder);
 193             versionManufacturerTextView.setText(manufacturerStringBuilder);
 194             versionModelTextView.setText(modelStringBuilder);
 195             versionDeviceTextView.setText(deviceStringBuilder);
 196             versionBootloaderTextView.setText(bootloaderStringBuilder);
 197             versionAndroidTextView.setText(androidStringBuilder);
 198             versionBuildTextView.setText(buildStringBuilder);
 199             versionWebKitTextView.setText(webKitStringBuilder);
 200             versionChromeTextView.setText(chromeStringBuilder);
 201
 202             // Build.VERSION.SECURITY_PATCH is only available for SDK_INT >= 23.
 203             if (Build.VERSION.SDK_INT >= 23) {
 204                 String securityPatchLabel = getString(R.string.security_patch) + "  ";
 205                 String securityPatch = Build.VERSION.SECURITY_PATCH;
 206                 SpannableStringBuilder securityPatchStringBuilder = new SpannableStringBuilder(securityPatchLabel + securityPatch);
 207                 securityPatchStringBuilder.setSpan(blueColorSpan, securityPatchLabel.length(), securityPatchStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 208                 versionSecurityPatchTextView.setText(securityPatchStringBuilder);
 209             } else {  // SDK_INT < 23, so `versionSecurityPatchTextView` should be hidden.
 210                 versionSecurityPatchTextView.setVisibility(View.GONE);
 211             }
 212
 213             // Only populate `versionRadioTextView` if there is a radio in the device.
 214             if (!radio.equals("")) {
 215                 String radioLabel = getString(R.string.radio) + "  ";
 216                 SpannableStringBuilder radioStringBuilder = new SpannableStringBuilder(radioLabel + radio);
 217                 radioStringBuilder.setSpan(blueColorSpan, radioLabel.length(), radioStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 218                 versionRadioTextView.setText(radioStringBuilder);
 219             } else {  // This device does not have a radio, so `versionRadioTextView` should be hidden.
 220                 versionRadioTextView.setVisibility(View.GONE);
 221             }
 222
 223             // Only populate `versionOrbotTextView` if Orbot is installed.
 224             if (!orbot.equals("")) {
 225                 String orbotLabel = getString(R.string.orbot) + "  ";
 226                 SpannableStringBuilder orbotStringBuilder = new SpannableStringBuilder(orbotLabel + orbot);
 227                 orbotStringBuilder.setSpan(blueColorSpan, orbotLabel.length(), orbotStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 228                 versionOrbotTextView.setText(orbotStringBuilder);
 229             } else {  // Orbot is not installed, so the `versionOrbotTextView` should be hidden.
 230                 versionOrbotTextView.setVisibility(View.GONE);
 231             }
 232
 233             // Display the package signature.
 234             try {
 235                 // Get the first package signature.  Suppress the lint warning about the need to be careful in implementing comparison of certificates for security purposes.
 236                 @SuppressLint("PackageManagerGetSignatures") Signature packageSignature = getContext().getPackageManager().getPackageInfo(getContext().getPackageName(), PackageManager.GET_SIGNATURES).signatures[0];
 237
 238                 // Convert the signature to a `byte[]` `InputStream`.
 239                 InputStream certificateByteArrayInputStream = new ByteArrayInputStream(packageSignature.toByteArray());
 240
 241                 // Display the certificate information on the screen.
 242                 try {
 243                     // Instantiate a `CertificateFactory`.
 244                     CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
 245
 246                     // Generate an `X509Certificate`.
 247                     X509Certificate x509Certificate = (X509Certificate) certificateFactory.generateCertificate(certificateByteArrayInputStream);
 248
 249                     // Store the individual sections of the certificate that we are interested in.
 250                     Principal issuerDNPrincipal = x509Certificate.getIssuerDN();
 251                     Principal subjectDNPrincipal = x509Certificate.getSubjectDN();
 252                     Date startDate = x509Certificate.getNotBefore();
 253                     Date endDate = x509Certificate.getNotAfter();
 254                     int certificateVersion = x509Certificate.getVersion();
 255                     BigInteger serialNumberBigInteger = x509Certificate.getSerialNumber();
 256                     String signatureAlgorithmNameString = x509Certificate.getSigAlgName();
 257
 258                     // Create a `SpannableStringBuilder` for each `TextView` that needs multiple colors of text.
 259                     SpannableStringBuilder issuerDNStringBuilder = new SpannableStringBuilder(issuerDNLabel + issuerDNPrincipal.toString());
 260                     SpannableStringBuilder subjectDNStringBuilder = new SpannableStringBuilder(subjectDNLabel + subjectDNPrincipal.toString());
 261                     SpannableStringBuilder startDateStringBuilder = new SpannableStringBuilder(startDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(startDate));
 262                     SpannableStringBuilder endDataStringBuilder = new SpannableStringBuilder(endDateLabel + DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.LONG).format(endDate));
 263                     SpannableStringBuilder certificateVersionStringBuilder = new SpannableStringBuilder(certificateVersionLabel + certificateVersion);
 264                     SpannableStringBuilder serialNumberStringBuilder = new SpannableStringBuilder(serialNumberLabel + serialNumberBigInteger);
 265                     SpannableStringBuilder signatureAlgorithmStringBuilder = new SpannableStringBuilder(signatureAlgorithmLabel + signatureAlgorithmNameString);
 266
 267                     // Setup the spans to display the device information in blue.  `SPAN_INCLUSIVE_INCLUSIVE` allows the span to grow in either direction.
 268                     issuerDNStringBuilder.setSpan(blueColorSpan, issuerDNLabel.length(), issuerDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 269                     subjectDNStringBuilder.setSpan(blueColorSpan, subjectDNLabel.length(), subjectDNStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 270                     startDateStringBuilder.setSpan(blueColorSpan, startDateLabel.length(), startDateStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 271                     endDataStringBuilder.setSpan(blueColorSpan, endDateLabel.length(), endDataStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 272                     certificateVersionStringBuilder.setSpan(blueColorSpan, certificateVersionLabel.length(), certificateVersionStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 273                     serialNumberStringBuilder.setSpan(blueColorSpan, serialNumberLabel.length(), serialNumberStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 274                     signatureAlgorithmStringBuilder.setSpan(blueColorSpan, signatureAlgorithmLabel.length(), signatureAlgorithmStringBuilder.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
 275
 276                     // Display the strings in the text boxes.
 277                     certificateIssuerDNTextView.setText(issuerDNStringBuilder);
 278                     certificateSubjectDNTextView.setText(subjectDNStringBuilder);
 279                     certificateStartDateTextView.setText(startDateStringBuilder);
 280                     certificateEndDateTextView.setText(endDataStringBuilder);
 281                     certificateVersionTextView.setText(certificateVersionStringBuilder);
 282                     certificateSerialNumberTextView.setText(serialNumberStringBuilder);
 283                     certificateSignatureAlgorithmTextView.setText(signatureAlgorithmStringBuilder);
 284                 } catch (CertificateException e) {
 285                     // Do nothing if there is a certificate error.
 286                 }
 287             } catch (PackageManager.NameNotFoundException e) {
 288                 // Do nothing if `PackageManager` says Privacy Browser isn't installed.
 289             }
 290         } else { // load a WebView for all the other tabs.  Tab numbers start at 0.
 291             // 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.
 292             tabLayout = inflater.inflate(R.layout.bare_webview, container, false);
 293
 294             // Get a handle for `tabWebView`.
 295             WebView tabWebView = (WebView) tabLayout;
 296
 297             // Filter the colors if `darkTheme` is `true`.
 298             if (MainWebViewActivity.darkTheme) {
 299                 // Initialize `darkPaint`.
 300                 Paint darkPaint = new Paint();
 301
 302                 // Setup a float array that inverts and tempers the colors (no hard whites or blacks).
 303                 float[] darkFilterFloatArray = {
 304                         -.8f, 0, 0, 0, 255,  // Red.
 305                         0, -.8f, 0, 0, 255,  // Green.
 306                         0, 0, -.8f, 0, 255,  // Blue.
 307                         0, 0, 0, .8f, 0      // Alpha.
 308                 };
 309
 310                 // Set `darkPaint` to use `darkFilterFloatArray`.
 311                 darkPaint.setColorFilter(new ColorMatrixColorFilter(darkFilterFloatArray));
 312
 313                 // Apply `darkPaint` to `tabWebView`.
 314                 tabWebView.setLayerType(View.LAYER_TYPE_HARDWARE, darkPaint);
 315             } else {
 316                 // Reset `tabWebView` to use the normal colors.
 317                 tabWebView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
 318             }
 319
 320             switch (tabNumber) {
 321                 case 1:
 322                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_permissions.html");
 323                     break;
 324
 325                 case 2:
 326                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_privacy_policy.html");
 327                     break;
 328
 329                 case 3:
 330                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_changelog.html");
 331                     break;
 332
 333                 case 4:
 334                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_licenses.html");
 335                     break;
 336
 337                 case 5:
 338                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_contributors.html");
 339                     break;
 340
 341                 case 6:
 342                     tabWebView.loadUrl("file:///android_asset/" + getString(R.string.android_asset_path) + "/about_links.html");
 343                     break;
 344
 345                 default:
 346                     break;
 347             }
 348         }
 349
 350         return tabLayout;
 351     }
 352 }