Files
Android/app/src/main/java/protect/card_locker/Utils.java
FC Stegerman ac0f6f6f3e Utils.getRenamedCardImageFileName(): add javadoc
Co-authored-by: Sylvia van Os <sylvia@hackerchick.me>
2023-07-17 20:35:02 +02:00

704 lines
28 KiB
Java

package protect.card_locker;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.ImageDecoder;
import android.graphics.Matrix;
import android.net.Uri;
import android.os.Build;
import android.os.LocaleList;
import android.provider.MediaStore;
import android.util.Log;
import android.util.TypedValue;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.RawRes;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.app.AppCompatDelegate;
import androidx.core.graphics.ColorUtils;
import androidx.exifinterface.media.ExifInterface;
import androidx.palette.graphics.Palette;
import com.google.android.material.color.DynamicColors;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.RGBLuminanceSource;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Currency;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import protect.card_locker.preferences.Settings;
public class Utils {
private static final String TAG = "Catima";
// Activity request codes
public static final int MAIN_REQUEST = 1;
public static final int SELECT_BARCODE_REQUEST = 2;
public static final int BARCODE_SCAN = 3;
public static final int BARCODE_IMPORT_FROM_IMAGE_FILE = 4;
public static final int CARD_IMAGE_FROM_CAMERA_FRONT = 5;
public static final int CARD_IMAGE_FROM_CAMERA_BACK = 6;
public static final int CARD_IMAGE_FROM_CAMERA_ICON = 7;
public static final int CARD_IMAGE_FROM_FILE_FRONT = 8;
public static final int CARD_IMAGE_FROM_FILE_BACK = 9;
public static final int CARD_IMAGE_FROM_FILE_ICON = 10;
public static final String CARD_IMAGE_FILENAME_REGEX = "^(card_)(\\d+)(_(?:front|back|icon)\\.png)$";
static final double LUMINANCE_MIDPOINT = 0.5;
static final int BITMAP_SIZE_SMALL = 512;
static final int BITMAP_SIZE_BIG = 2048;
static public LetterBitmap generateIcon(Context context, LoyaltyCard loyaltyCard, boolean forShortcut) {
return generateIcon(context, loyaltyCard.store, loyaltyCard.headerColor, forShortcut);
}
static public LetterBitmap generateIcon(Context context, String store, Integer backgroundColor) {
return generateIcon(context, store, backgroundColor, false);
}
static public LetterBitmap generateIcon(Context context, String store, Integer backgroundColor, boolean forShortcut) {
if (store.length() == 0) {
return null;
}
int tileLetterFontSize;
if (forShortcut) {
tileLetterFontSize = context.getResources().getDimensionPixelSize(R.dimen.tileLetterFontSizeForShortcut);
} else {
tileLetterFontSize = context.getResources().getDimensionPixelSize(R.dimen.tileLetterFontSize);
}
int pixelSize = context.getResources().getDimensionPixelSize(R.dimen.tileLetterImageSize);
if (backgroundColor == null) {
backgroundColor = LetterBitmap.getDefaultColor(context, store);
}
return new LetterBitmap(context, store, store,
tileLetterFontSize, pixelSize, pixelSize, backgroundColor, needsDarkForeground(backgroundColor) ? Color.BLACK : Color.WHITE);
}
static public boolean needsDarkForeground(Integer backgroundColor) {
return ColorUtils.calculateLuminance(backgroundColor) > LUMINANCE_MIDPOINT;
}
/**
* Returns the Barcode format and content based on the result of an activity.
* It shows toasts to notify the end-user as needed itself and will return an empty
* BarcodeValues object if the activity was cancelled or nothing could be found.
*
* @param requestCode
* @param resultCode
* @param intent
* @param context
* @return BarcodeValues
*/
static public BarcodeValues parseSetBarcodeActivityResult(int requestCode, int resultCode, Intent intent, Context context) {
String contents;
String format;
if (resultCode != Activity.RESULT_OK) {
return new BarcodeValues(null, null);
}
if (requestCode == Utils.BARCODE_IMPORT_FROM_IMAGE_FILE) {
Log.i(TAG, "Received image file with possible barcode");
Uri data = intent.getData();
if (data == null) {
Log.e(TAG, "Intent did not contain any data");
Toast.makeText(context, R.string.errorReadingImage, Toast.LENGTH_LONG).show();
return new BarcodeValues(null, null);
}
Bitmap bitmap;
try {
bitmap = retrieveImageFromUri(context, data);
} catch (IOException e) {
Log.e(TAG, "Error getting data from image file");
e.printStackTrace();
Toast.makeText(context, R.string.errorReadingImage, Toast.LENGTH_LONG).show();
return new BarcodeValues(null, null);
}
BarcodeValues barcodeFromBitmap = getBarcodeFromBitmap(bitmap);
if (barcodeFromBitmap.isEmpty()) {
Log.i(TAG, "No barcode found in image file");
Toast.makeText(context, R.string.noBarcodeFound, Toast.LENGTH_LONG).show();
}
Log.i(TAG, "Read barcode id: " + barcodeFromBitmap.content());
Log.i(TAG, "Read format: " + barcodeFromBitmap.format());
return barcodeFromBitmap;
}
if (requestCode == Utils.BARCODE_SCAN || requestCode == Utils.SELECT_BARCODE_REQUEST) {
if (requestCode == Utils.BARCODE_SCAN) {
Log.i(TAG, "Received barcode information from camera");
} else if (requestCode == Utils.SELECT_BARCODE_REQUEST) {
Log.i(TAG, "Received barcode information from typing it");
}
contents = intent.getStringExtra(BarcodeSelectorActivity.BARCODE_CONTENTS);
format = intent.getStringExtra(BarcodeSelectorActivity.BARCODE_FORMAT);
Log.i(TAG, "Read barcode id: " + contents);
Log.i(TAG, "Read format: " + format);
return new BarcodeValues(format, contents);
}
throw new UnsupportedOperationException("Unknown request code for parseSetBarcodeActivityResult");
}
static public Bitmap retrieveImageFromUri(Context context, Uri data) throws IOException {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
ImageDecoder.Source image_source = ImageDecoder.createSource(context.getContentResolver(), data);
return ImageDecoder.decodeBitmap(image_source, (decoder, info, source) -> decoder.setMutableRequired(true));
} else {
return getBitmapSdkLessThan29(data, context);
}
}
@SuppressWarnings("deprecation")
private static Bitmap getBitmapSdkLessThan29(Uri data, Context context) throws IOException {
return MediaStore.Images.Media.getBitmap(context.getContentResolver(), data);
}
static public BarcodeValues getBarcodeFromBitmap(Bitmap bitmap) {
// This function is vulnerable to OOM, so we try again with a smaller bitmap is we get OOM
for (int i = 0; i < 10; i++) {
try {
return Utils.getBarcodeFromBitmapReal(bitmap);
} catch (OutOfMemoryError e) {
Log.w(TAG, "Ran OOM in getBarcodeFromBitmap! Trying again with smaller picture! Retry " + i + " of 10.");
bitmap = Bitmap.createScaledBitmap(bitmap, (int) Math.round(0.75 * bitmap.getWidth()), (int) Math.round(0.75 * bitmap.getHeight()), false);
}
}
// Give up
return new BarcodeValues(null, null);
}
static private BarcodeValues getBarcodeFromBitmapReal(Bitmap bitmap) {
// In order to decode it, the Bitmap must first be converted into a pixel array...
int[] intArray = new int[bitmap.getWidth() * bitmap.getHeight()];
bitmap.getPixels(intArray, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());
// ...and then turned into a binary bitmap from its luminance
LuminanceSource source = new RGBLuminanceSource(bitmap.getWidth(), bitmap.getHeight(), intArray);
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
Result barcodeResult = new MultiFormatReader().decode(binaryBitmap);
return new BarcodeValues(barcodeResult.getBarcodeFormat().name(), barcodeResult.getText());
} catch (NotFoundException e) {
return new BarcodeValues(null, null);
}
}
static public Boolean isNotYetValid(Date validFromDate) {
// The note in `hasExpired` does not apply here, since the bug was fixed before this feature was added.
return validFromDate.after(getStartOfToday().getTime());
}
static public Boolean hasExpired(Date expiryDate) {
// Note: In #1083 it was discovered that `DatePickerFragment` may sometimes store the expiryDate
// at 12:00 PM instead of 12:00 AM in the DB. While this has been fixed and the 12-hour difference
// is not a problem for the way the comparison currently works, it's good to keep in mind such
// dates may exist in the DB in case the comparison changes in the future and the new one relies
// on both dates being set at 12:00 AM.
return expiryDate.before(getStartOfToday().getTime());
}
static private Calendar getStartOfToday() {
// today
Calendar date = new GregorianCalendar();
// reset hour, minutes, seconds and millis
date.set(Calendar.HOUR_OF_DAY, 0);
date.set(Calendar.MINUTE, 0);
date.set(Calendar.SECOND, 0);
date.set(Calendar.MILLISECOND, 0);
return date;
}
static public String formatBalance(Context context, BigDecimal value, Currency currency) {
NumberFormat numberFormat = NumberFormat.getInstance();
if (currency == null) {
numberFormat.setMaximumFractionDigits(0);
return context.getResources().getQuantityString(R.plurals.balancePoints, value.intValue(), numberFormat.format(value));
}
NumberFormat currencyFormat = NumberFormat.getCurrencyInstance();
currencyFormat.setCurrency(currency);
currencyFormat.setMinimumFractionDigits(currency.getDefaultFractionDigits());
currencyFormat.setMaximumFractionDigits(currency.getDefaultFractionDigits());
return currencyFormat.format(value);
}
static public String formatBalanceWithoutCurrencySymbol(BigDecimal value, Currency currency) {
NumberFormat numberFormat = NumberFormat.getInstance();
if (currency == null) {
numberFormat.setMaximumFractionDigits(0);
return numberFormat.format(value);
}
numberFormat.setMinimumFractionDigits(currency.getDefaultFractionDigits());
numberFormat.setMaximumFractionDigits(currency.getDefaultFractionDigits());
return numberFormat.format(value);
}
static public BigDecimal parseBalance(String value, Currency currency) throws ParseException {
NumberFormat numberFormat = NumberFormat.getInstance();
if (currency == null) {
numberFormat.setMaximumFractionDigits(0);
} else {
numberFormat.setMinimumFractionDigits(currency.getDefaultFractionDigits());
numberFormat.setMaximumFractionDigits(currency.getDefaultFractionDigits());
}
Log.d(TAG, numberFormat.parse(value).toString());
return new BigDecimal(numberFormat.parse(value).toString());
}
static public byte[] bitmapToByteArray(Bitmap bitmap) {
if (bitmap == null) {
return null;
}
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);
return bos.toByteArray();
}
static public Bitmap resizeBitmap(Bitmap bitmap, double maxSize) {
if (bitmap == null) {
return null;
}
double width = bitmap.getWidth();
double height = bitmap.getHeight();
if (height > width) {
double scale = height / maxSize;
height = maxSize;
width = width / scale;
} else if (width > height) {
double scale = width / maxSize;
width = maxSize;
height = height / scale;
} else {
height = maxSize;
width = maxSize;
}
return Bitmap.createScaledBitmap(bitmap, (int) Math.round(width), (int) Math.round(height), true);
}
static public Bitmap rotateBitmap(Bitmap bitmap, ExifInterface exifInterface) {
switch (exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED)) {
case ExifInterface.ORIENTATION_ROTATE_90:
return rotateBitmap(bitmap, 90f);
case ExifInterface.ORIENTATION_ROTATE_180:
return rotateBitmap(bitmap, 180f);
case ExifInterface.ORIENTATION_ROTATE_270:
return rotateBitmap(bitmap, 270f);
default:
return bitmap;
}
}
static public Bitmap rotateBitmap(Bitmap bitmap, float rotation) {
if (rotation == 0) {
return bitmap;
}
Matrix matrix = new Matrix();
matrix.postRotate(rotation);
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
}
static public String getCardImageFileName(int loyaltyCardId, ImageLocationType type) {
StringBuilder cardImageFileNameBuilder = new StringBuilder();
cardImageFileNameBuilder.append("card_");
cardImageFileNameBuilder.append(loyaltyCardId);
cardImageFileNameBuilder.append("_");
if (type == ImageLocationType.front) {
cardImageFileNameBuilder.append("front");
} else if (type == ImageLocationType.back) {
cardImageFileNameBuilder.append("back");
} else if (type == ImageLocationType.icon) {
cardImageFileNameBuilder.append("icon");
} else {
throw new IllegalArgumentException("Unknown image type");
}
cardImageFileNameBuilder.append(".png");
return cardImageFileNameBuilder.toString();
}
/**
* Returns a card image filename (string) with the ID replaced according to the map if the input is a valid card image filename (string), otherwise null.
*
* @param fileName e.g. "card_1_front.png"
* @param idMap e.g. Map.of(1, 2)
* @return String e.g. "card_2_front.png"
*/
static public String getRenamedCardImageFileName(final String fileName, final Map<Integer, Integer> idMap) {
Pattern pattern = Pattern.compile(CARD_IMAGE_FILENAME_REGEX);
Matcher matcher = pattern.matcher(fileName);
if (matcher.matches()) {
StringBuilder cardImageFileNameBuilder = new StringBuilder();
cardImageFileNameBuilder.append(matcher.group(1));
try {
int id = Integer.parseInt(matcher.group(2));
cardImageFileNameBuilder.append(idMap.getOrDefault(id, id));
} catch (NumberFormatException _e) {
return null;
}
cardImageFileNameBuilder.append(matcher.group(3));
return cardImageFileNameBuilder.toString();
}
return null;
}
static public void saveCardImage(Context context, Bitmap bitmap, String fileName) throws FileNotFoundException {
if (bitmap == null) {
context.deleteFile(fileName);
return;
}
FileOutputStream out = context.openFileOutput(fileName, Context.MODE_PRIVATE);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
}
static public void saveCardImage(Context context, Bitmap bitmap, int loyaltyCardId, ImageLocationType type) throws FileNotFoundException {
saveCardImage(context, bitmap, getCardImageFileName(loyaltyCardId, type));
}
public static File retrieveCardImageAsFile(Context context, String fileName) {
return context.getFileStreamPath(fileName);
}
public static File retrieveCardImageAsFile(Context context, int loyaltyCardId, ImageLocationType type) {
return retrieveCardImageAsFile(context, getCardImageFileName(loyaltyCardId, type));
}
static public Bitmap retrieveCardImage(Context context, String fileName) {
FileInputStream in;
try {
in = context.openFileInput(fileName);
} catch (FileNotFoundException e) {
return null;
}
return BitmapFactory.decodeStream(in);
}
static public Bitmap retrieveCardImage(Context context, int loyaltyCardId, ImageLocationType type) {
return retrieveCardImage(context, getCardImageFileName(loyaltyCardId, type));
}
static public <T, U> U mapGetOrDefault(Map<T, U> map, T key, U defaultValue) {
U value = map.get(key);
if (value == null) {
return defaultValue;
}
return value;
}
static public Locale stringToLocale(String localeString) {
String[] localeParts = localeString.split("-");
if (localeParts.length == 1) {
return new Locale(localeParts[0]);
}
if (localeParts[1].startsWith("r")) {
localeParts[1] = localeParts[1].substring(1);
}
return new Locale(localeParts[0], localeParts[1]);
}
static public Context updateBaseContextLocale(Context context) {
Settings settings = new Settings(context);
Locale chosenLocale = settings.getLocale();
Resources res = context.getResources();
Configuration configuration = res.getConfiguration();
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
setLocalesSdkLessThan24(chosenLocale, configuration, res);
return context;
}
LocaleList localeList = chosenLocale != null ? new LocaleList(chosenLocale) : LocaleList.getDefault();
LocaleList.setDefault(localeList);
configuration.setLocales(localeList);
return context.createConfigurationContext(configuration);
}
@SuppressWarnings("deprecation")
private static void setLocalesSdkLessThan24(Locale chosenLocale, Configuration configuration, Resources res) {
configuration.locale = chosenLocale != null ? chosenLocale : Locale.getDefault();
res.updateConfiguration(configuration, res.getDisplayMetrics());
}
static public long getUnixTime() {
return System.currentTimeMillis() / 1000;
}
static public boolean isDarkModeEnabled(Context inputContext) {
int nightModeSetting = new Settings(inputContext).getTheme();
if (nightModeSetting == AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM) {
Configuration config = inputContext.getResources().getConfiguration();
int currentNightMode = config.uiMode & Configuration.UI_MODE_NIGHT_MASK;
return (currentNightMode == Configuration.UI_MODE_NIGHT_YES);
} else {
return nightModeSetting == AppCompatDelegate.MODE_NIGHT_YES;
}
}
public static File createTempFile(Context context, String name) {
return new File(context.getCacheDir() + "/" + name);
}
public static File copyToTempFile(Context context, InputStream input, String name) throws IOException {
File file = createTempFile(context, name);
try (input; FileOutputStream out = new FileOutputStream(file)) {
byte[] buf = new byte[4096];
int len;
while ((len = input.read(buf)) != -1) {
out.write(buf, 0, len);
}
return file;
}
}
public static String saveTempImage(Context context, Bitmap in, String name, Bitmap.CompressFormat format) {
File image = createTempFile(context, name);
try (FileOutputStream out = new FileOutputStream(image)) {
in.compress(format, 100, out);
return image.getAbsolutePath();
} catch (IOException e) {
Log.d("store temp image", "failed writing temp file for temporary image, name: " + name);
return null;
}
}
public static Bitmap loadImage(String path) {
try {
return BitmapFactory.decodeStream(new FileInputStream(path));
} catch (IOException e) {
Log.d("load image", "failed loading image from " + path);
return null;
}
}
public static Bitmap loadTempImage(Context context, String name) {
return loadImage(context.getCacheDir() + "/" + name);
}
// https://stackoverflow.com/a/59324801/8378787
public static int getComplementaryColor(int color) {
int R = color & 255;
int G = (color >> 8) & 255;
int B = (color >> 16) & 255;
int A = (color >> 24) & 255;
R = 255 - R;
G = 255 - G;
B = 255 - B;
return R + (G << 8) + (B << 16) + (A << 24);
}
// replace colors in the current theme
public static void patchColors(AppCompatActivity activity) {
Settings settings = new Settings(activity);
String color = settings.getColor();
Resources.Theme theme = activity.getTheme();
Resources resources = activity.getResources();
if (color.equals(resources.getString(R.string.settings_key_pink_theme))) {
theme.applyStyle(R.style.pink, true);
} else if (color.equals(resources.getString(R.string.settings_key_magenta_theme))) {
theme.applyStyle(R.style.magenta, true);
} else if (color.equals(resources.getString(R.string.settings_key_violet_theme))) {
theme.applyStyle(R.style.violet, true);
} else if (color.equals(resources.getString(R.string.settings_key_blue_theme))) {
theme.applyStyle(R.style.blue, true);
} else if (color.equals(resources.getString(R.string.settings_key_sky_blue_theme))) {
theme.applyStyle(R.style.skyblue, true);
} else if (color.equals(resources.getString(R.string.settings_key_green_theme))) {
theme.applyStyle(R.style.green, true);
} else if (color.equals(resources.getString(R.string.settings_key_brown_theme))) {
theme.applyStyle(R.style.brown, true);
} else if (color.equals(resources.getString(R.string.settings_key_catima_theme))) {
// catima theme is AppTheme itself, no dynamic colors nor applyStyle
} else {
// final catch all in case of invalid theme value from older versions
// also handles R.string.settings_key_system_theme
DynamicColors.applyToActivityIfAvailable(activity);
}
if (isDarkModeEnabled(activity) && settings.getOledDark()) {
theme.applyStyle(R.style.DarkBackground, true);
}
}
// XXX android 9 and below has issues with patched theme where the background becomes a
// rendering mess
// use after views are inflated
public static void postPatchColors(AppCompatActivity activity) {
TypedValue typedValue = new TypedValue();
activity.getTheme().resolveAttribute(android.R.attr.colorBackground, typedValue, true);
activity.findViewById(android.R.id.content).setBackgroundColor(typedValue.data);
}
public static int getHeaderColorFromImage(Bitmap image, int fallback) {
if (image == null) {
return fallback;
}
return new Palette.Builder(image).generate().getDominantColor(androidx.appcompat.R.attr.colorPrimary);
}
public static int getRandomHeaderColor(Context context) {
TypedArray colors = context.getResources().obtainTypedArray(R.array.letter_tile_colors);
final int color = (int) (Math.random() * colors.length());
return colors.getColor(color, Color.BLACK);
}
public static String readTextFile(Context context, @RawRes int resourceId) throws IOException {
InputStream input = context.getResources().openRawResource(resourceId);
BufferedReader reader = new BufferedReader(new InputStreamReader(input, StandardCharsets.UTF_8));
StringBuilder result = new StringBuilder();
while (true) {
String nextLine = reader.readLine();
if (nextLine == null || nextLine.isEmpty()) {
reader.close();
break;
}
result.append("\n");
result.append(nextLine);
}
return result.toString();
}
public static void setIconOrTextWithBackground(Context context, LoyaltyCard loyaltyCard, Bitmap icon, ImageView backgroundOrIcon, TextView textWhenNoImage) {
if (icon != null) {
Log.d("onResume", "setting icon image");
textWhenNoImage.setVisibility(View.GONE);
backgroundOrIcon.setImageBitmap(icon);
backgroundOrIcon.setBackgroundColor(Color.TRANSPARENT);
} else {
textWhenNoImage.setVisibility(View.VISIBLE);
int headerColor = getHeaderColor(context, loyaltyCard);
backgroundOrIcon.setImageBitmap(null);
backgroundOrIcon.setBackgroundColor(headerColor);
textWhenNoImage.setText(loyaltyCard.store);
textWhenNoImage.setTextColor(Utils.needsDarkForeground(headerColor) ? Color.BLACK : Color.WHITE);
}
}
public static boolean installedFromGooglePlay(Context context) {
try {
String packageName = context.getPackageName();
String installer;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
installer = context.getPackageManager().getInstallSourceInfo(packageName).getInstallingPackageName();
} else {
installer = context.getPackageManager().getInstallerPackageName(packageName);
}
return installer.equals("com.android.vending");
} catch (Throwable ignored) {
return false;
}
}
public static int getHeaderColor(Context context, LoyaltyCard loyaltyCard) {
return loyaltyCard.headerColor != null ? loyaltyCard.headerColor : LetterBitmap.getDefaultColor(context, loyaltyCard.store);
}
public static String checksum(InputStream input) throws IOException {
try {
MessageDigest md = MessageDigest.getInstance("SHA-1");
byte[] buf = new byte[4096];
int len;
while ((len = input.read(buf)) != -1) {
md.update(buf, 0, len);
}
StringBuilder sb = new StringBuilder();
for (byte b : md.digest()) {
sb.append(String.format("%02x", b));
}
return sb.toString();
} catch (NoSuchAlgorithmException _e) {
return null;
}
}
public static boolean equals(final Object a, final Object b) {
if (a == null && b == null) {
return true;
} else if (a == null || b == null) {
return false;
}
return a.equals(b);
}
}