Handle invalid error in the request form

Signed-off-by: Émile Ré <nemile.re@gmail.com>

pkg/trust/trust_center_access_service.go

@@ -58,9 +58,9 @@ const (
 func (tcar *TrustCenterAccessRequest) Validate() error {
 	v := validator.New()
 
-	v.Check(tcar.Email, "email", validator.NotOneOfSlice([]string{}))
+	v.Check(tcar.Email, "email", validator.NotBlacklisted())
 
-	return nil
+	return v.Error()
 }
 
 func (s TrustCenterAccessService) ValidateToken(
@@ -88,7 +88,7 @@ func (s TrustCenterAccessService) Request(
 	req *TrustCenterAccessRequest,
 ) (*coredata.TrustCenterAccess, error) {
 	if err := req.Validate(); err != nil {
-		return nil, fmt.Errorf("invalid request arguments")
+		return nil, fmt.Errorf("invalid request arguments: %w", err)
 	}
 
 	now := time.Now()

pkg/validator/validator_email.go

@@ -37,7 +37,7 @@ func NotBlacklisted() ValidatorFunc {
 
 		if err == nil {
 			return newValidationError(
-				ErrorCodeInvalidEnum,
+				ErrorCodeInvalidEmail,
 				"must not be blacklisted",
 			)
 		}