Add ValidateLocationID function an location id validation

checklocationid.go

@@ -0,0 +1,13 @@
+package fiskalhrgo
+
+import (
+	"regexp"
+)
+
+// ValidateLocationID validates the locationID
+// It can contain only digits (0-9) and letters (a-z, A-Z), with a maximum length of 20.
+func ValidateLocationID(locationID string) bool {
+	// Regex pattern to match valid locationID
+	validLocationID := regexp.MustCompile(`^[a-zA-Z0-9]{1,20}$`)
+	return validLocationID.MatchString(locationID)
+}

checklocationid_test.go

@@ -0,0 +1,43 @@
+package fiskalhrgo
+
+import "testing"
+
+func TestValidateLocationID(t *testing.T) {
+	t.Logf("Testing location ID validation...")
+
+	if !ValidateLocationID("12345678") {
+		t.Fatalf("Expected location ID 12345678 to be valid")
+	}
+
+	if !ValidateLocationID("TEST3") {
+		t.Fatalf("Expected location ID TEST3 to be valid")
+	}
+
+	if !ValidateLocationID("POS1") {
+		t.Fatalf("Expected location ID POS1 to be valid")
+	}
+
+	if !ValidateLocationID("1") {
+		t.Fatalf("Expected location ID 1 to be valid")
+	}
+
+	if !ValidateLocationID("1234567a") {
+		t.Fatalf("Expected location ID 1234567a to be valid")
+	}
+
+	if ValidateLocationID("1234567!") {
+		t.Fatalf("Expected location ID 1234567! to be invalid")
+	}
+
+	if ValidateLocationID("1234567.") {
+		t.Fatalf("Expected location ID 1234567. to be invalid")
+	}
+
+	if ValidateLocationID("POS 1") {
+		t.Fatalf("Expected location ID POS 1 to be invalid")
+	}
+
+	if ValidateLocationID("fdkjhfdhjfdshfshfdkhfd87549549875kjfhhfdshfjhjdshkjdfsk7554875kjgfkjgfsssssssssssssssssssssssss") {
+		t.Fatalf("Expected location ID fdkjhfdhjfdshfshfdkhfd87549549875kjfhhfdshfjhjdshkjdfsk7554875kjgfkjgfsssssssssssssssssssssssss to be invalid")
+	}
+}

fiskalhr.go

@@ -88,6 +88,11 @@ func NewFiskalEntity(oib string, sustavPDV bool, locationID string, centralizedI
 		return nil, errors.New("invalid OIB")
 	}
 
+	//check if locationID is valid
+	if !ValidateLocationID(locationID) {
+		return nil, errors.New("invalid locationID")
+	}
+
 	var CIScert *signatureCheckCIScert
 	var CIScerterror error