implement prepareProperties for converting plaintext password to hash before saving

src/main/java/net/hostsharing/hsadminng/hash/HashProcessor.java

@@ -2,6 +2,9 @@ package net.hostsharing.hsadminng.hash;
 
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
+import java.util.PriorityQueue;
+import java.util.Queue;
+import java.util.random.RandomGenerator;
 
 import lombok.SneakyThrows;
 import org.bouncycastle.crypto.generators.OpenBSDBCrypt;
@@ -10,7 +13,9 @@ import static net.hostsharing.hsadminng.hash.HashProcessor.Algorithm.SHA512;
 
 public class HashProcessor {
 
-    private static final SecureRandom secureRandom = new SecureRandom();
+    private static final RandomGenerator random = new SecureRandom();
+    private static final Queue<String> predefinedSalts = new PriorityQueue<>();
+
     public static final int SALT_LENGTH = 16;
     public static final int COST_FACTOR = 13;
 
@@ -60,15 +65,22 @@ public class HashProcessor {
         return "$6$" + salt + "$" + hashedPassword;
     }
 
+    public static void nextSalt(final String salt) {
+        predefinedSalts.add(salt);
+    }
+
     public HashProcessor withSalt(final String salt) {
         this.salt = salt;
         return this;
     }
 
     public HashProcessor withRandomSalt() {
+        if (!predefinedSalts.isEmpty()) {
+            return withSalt(predefinedSalts.poll());
+        }
         final var stringBuilder = new StringBuilder(SALT_LENGTH);
         for (int i = 0; i < SALT_LENGTH; ++i) {
-            int randomIndex = secureRandom.nextInt(SALT_CHARACTERS.length());
+            int randomIndex = random.nextInt(SALT_CHARACTERS.length());
             stringBuilder.append(SALT_CHARACTERS.charAt(randomIndex));
         }
         return withSalt(stringBuilder.toString());

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsHostingAssetEntityProcessor.java

@@ -29,8 +29,9 @@ public class HsHostingAssetEntityProcessor {
     }
 
     /// hashing passwords etc.
+    @SuppressWarnings("unchecked")
     public  HsHostingAssetEntityProcessor prepareForSave() {
-        // FIXME: add computed properties
+        validator.prepareProperties(entity);
         return this;
     }
 

src/main/java/net/hostsharing/hsadminng/hs/validation/HsEntityValidator.java

@@ -90,12 +90,20 @@ public abstract class HsEntityValidator<E extends PropertiesProvider> {
         throw new IllegalArgumentException("Integer value (or null) expected, but got " + value);
     }
 
+    public void prepareProperties(final E entity) {
+        stream(propertyValidators).forEach(p -> {
+            if ( p.isWriteOnly() && p.isComputed()) {
+                entity.directProps().put(p.propertyName, p.compute(entity));
+            }
+        });
+    }
+
     public Map<String, Object> revampProperties(final E entity, final Map<String, Object> config) {
         final var copy = new HashMap<>(config);
         stream(propertyValidators).forEach(p -> {
             if (p.isWriteOnly()) {
                 copy.remove(p.propertyName);
-            } else if (p.isComputed()) {
+            } else if (p.isReadOnly() && p.isComputed()) {
                 copy.put(p.propertyName, p.compute(entity));
             }
         });

src/main/java/net/hostsharing/hsadminng/hs/validation/PasswordProperty.java

@@ -34,7 +34,6 @@ public class PasswordProperty extends StringProperty<PasswordProperty> {
 
     public PasswordProperty hashedUsing(final Algorithm algorithm) {
         this.hashedUsing = algorithm;
-        // FIXME: computedBy is too late, we need preprocess
         computedBy((entity)
                 -> ofNullable(entity.getDirectValue(propertyName, String.class))
                     .map(password -> hashAlgorithm(algorithm).withRandomSalt().generate(password).forLinux())

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetControllerAcceptanceTest.java

@@ -3,6 +3,7 @@ package net.hostsharing.hsadminng.hs.hosting.asset;
 import io.restassured.RestAssured;
 import io.restassured.http.ContentType;
 import net.hostsharing.hsadminng.HsadminNgApplication;
+import net.hostsharing.hsadminng.hash.HashProcessor;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemRepository;
 import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
@@ -523,6 +524,7 @@ class HsHostingAssetControllerAcceptanceTest extends ContextBasedTestWithCleanup
                             .identifier("fir01-temp")
                             .caption("some test-unix-user")
                             .build());
+            HashProcessor.nextSalt("Jr5w/Y8zo8pCkqg7");
 
             RestAssured // @formatter:off
                     .given()
@@ -575,7 +577,7 @@ class HsHostingAssetControllerAcceptanceTest extends ContextBasedTestWithCleanup
                         assertThat(asset.getCaption()).isEqualTo("some patched test-unix-user");
                         assertThat(asset.getConfig().toString()).isEqualTo("""
                                {
-                                   "password": "Ein Passwort mit 4 Zeichengruppen!",
+                                   "password": "$6$Jr5w/Y8zo8pCkqg7$JDJ5JDEzJFFsR3pidzdYTUZudE1GL0JZMURsTHVkZUpwTmVZYlM4ZzRqeC95WUo3Y2c5OUpTdUZpbWFx",
                                    "shell": "/bin/bash",
                                    "totpKey": "0x1234567890abcdef0123456789abcdef"
                                }