Simplify saml validation

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/auth/saml_config_validator.go

@@ -23,15 +23,6 @@ import (
 	pemutil "github.com/getprobo/probo/pkg/crypto/pem"
 )
 
-type ValidationError struct {
-	Field   string
-	Message string
-}
-
-func (e ValidationError) Error() string {
-	return fmt.Sprintf("%s: %s", e.Field, e.Message)
-}
-
 // ValidateIdPConfiguration validates only the IdP (Identity Provider) configuration.
 // This validates user-provided data from the IdP.
 // SP (Service Provider) configuration is generated by the application and doesn't need validation.
@@ -39,68 +30,45 @@ func ValidateIdPConfiguration(
 	idpEntityID string,
 	idpSsoURL string,
 	idpCertificate string,
-) []ValidationError {
-	var errors []ValidationError
-
+) error {
 	// Validate IdP Entity ID
 	if idpEntityID == "" {
-		errors = append(errors, ValidationError{
-			Field:   "idp_entity_id",
-			Message: "IdP Entity ID cannot be empty",
-		})
+		return fmt.Errorf("IdP Entity ID cannot be empty")
 	}
 
 	// Validate IdP SSO URL - accept both HTTP and HTTPS
-	if err := validateURL(idpSsoURL, "idp_sso_url"); err != nil {
-		errors = append(errors, *err)
+	if err := validateURL(idpSsoURL); err != nil {
+		return err
 	}
 
 	// Validate IdP certificate
 	if err := validateCertificate(idpCertificate); err != nil {
-		errors = append(errors, ValidationError{
-			Field:   "idp_certificate",
-			Message: err.Error(),
-		})
+		return err
 	}
 
-	return errors
+	return nil
 }
 
-func validateURL(urlStr string, fieldName string) *ValidationError {
+func validateURL(urlStr string) error {
 	if urlStr == "" {
-		return &ValidationError{
-			Field:   fieldName,
-			Message: "URL cannot be empty",
-		}
+		return fmt.Errorf("URL cannot be empty")
 	}
 
 	parsedURL, err := url.Parse(urlStr)
 	if err != nil {
-		return &ValidationError{
-			Field:   fieldName,
-			Message: fmt.Sprintf("invalid URL format: %v", err),
-		}
+		return fmt.Errorf("invalid URL format: %w", err)
 	}
 
 	if parsedURL.Scheme == "" {
-		return &ValidationError{
-			Field:   fieldName,
-			Message: "URL must have a scheme (http or https)",
-		}
+		return fmt.Errorf("URL must have a scheme (http or https)")
 	}
 
 	if parsedURL.Scheme != "http" && parsedURL.Scheme != "https" {
-		return &ValidationError{
-			Field:   fieldName,
-			Message: "URL scheme must be http or https (found: " + parsedURL.Scheme + ")",
-		}
+		return fmt.Errorf("URL scheme must be http or https (found: %s)", parsedURL.Scheme)
 	}
 
 	if parsedURL.Host == "" {
-		return &ValidationError{
-			Field:   fieldName,
-			Message: "URL must have a host",
-		}
+		return fmt.Errorf("URL must have a host")
 	}
 
 	return nil