Add initial Hash configuration. Add the HashDetailsHandler.

src/main/java/io/kamax/mxisd/config/HashingConfig.java

@@ -0,0 +1,65 @@
+package io.kamax.mxisd.config;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class HashingConfig {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(HashingConfig.class);
+
+    private boolean enabled = false;
+    private int pepperLength = 10;
+    private RotationPolicyEnum rotationPolicy;
+    private HashStorageEnum hashStorageType;
+
+    public void build() {
+        if (isEnabled()) {
+            LOGGER.info("--- Hash configuration ---");
+            LOGGER.info("   Pepper length: {}", getPepperLength());
+            LOGGER.info("   Rotation policy: {}", getRotationPolicy());
+            LOGGER.info("   Hash storage type: {}", getHashStorageType());
+        } else {
+            LOGGER.info("Hash configuration disabled, used only `none` pepper.");
+        }
+    }
+
+    public enum RotationPolicyEnum {
+        PER_REQUESTS
+    }
+
+    public enum HashStorageEnum {
+        IN_MEMORY
+    }
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+    }
+
+    public int getPepperLength() {
+        return pepperLength;
+    }
+
+    public void setPepperLength(int pepperLength) {
+        this.pepperLength = pepperLength;
+    }
+
+    public RotationPolicyEnum getRotationPolicy() {
+        return rotationPolicy;
+    }
+
+    public void setRotationPolicy(RotationPolicyEnum rotationPolicy) {
+        this.rotationPolicy = rotationPolicy;
+    }
+
+    public HashStorageEnum getHashStorageType() {
+        return hashStorageType;
+    }
+
+    public void setHashStorageType(HashStorageEnum hashStorageType) {
+        this.hashStorageType = hashStorageType;
+    }
+}