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made the utility classes instantiable

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This commit is contained in:
Rostislav Raykov
2024-10-29 21:13:47 +02:00
parent 26378a110b
commit e236c29ef3
3 changed files with 23 additions and 10 deletions
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4
src/main/java/org/rostislav/quickdrop/util/DataValidator.java
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@@ -1,6 +1,10 @@
package org.rostislav.quickdrop.util;
public class DataValidator {
private DataValidator() {
// To prevent instantiation
}
public static boolean validateObjects(Object... objs) {
for (Object temp : objs) {
if (temp != null) {

18
src/main/java/org/rostislav/quickdrop/util/FileEncryptionUtils.java
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@@ -1,5 +1,9 @@
package org.rostislav.quickdrop.util;
import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
@@ -10,21 +14,15 @@ import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
public class FileEncryptionUtils {
private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
private static final int ITERATION_COUNT = 65536;
private static final int KEY_LENGTH = 128;
private FileEncryptionUtils() {
// To prevent instantiation
}
public static SecretKey generateKeyFromPassword(String password, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException {
PBEKeySpec spec = new PBEKeySpec(password.toCharArray(), salt, ITERATION_COUNT, KEY_LENGTH);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");

11
src/main/java/org/rostislav/quickdrop/util/FileUtils.java
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@@ -5,6 +5,9 @@ import org.rostislav.quickdrop.model.FileEntity;
import org.springframework.ui.Model;
public class FileUtils {
private FileUtils() {
// To prevent instantiation
}
public static String formatFileSize(long size) {
String[] units = {"B", "KB", "MB", "GB", "TB"};
@@ -17,6 +20,14 @@ public class FileUtils {
return String.format("%.2f %s", sizeInUnits, units[unitIndex]);
}
public static long bytesToMegabytes(long bytes) {
return bytes / 1024 / 1024;
}
public static long megabytesToBytes(long megabytes) {
return megabytes * 1024 * 1024;
}
public static String getDownloadLink(HttpServletRequest request, FileEntity fileEntity) {
return request.getScheme() + "://" + request.getServerName() + "/file/" + fileEntity.uuid;
}