muonsoft / validation

import (

	"errors"

	"net/url"

)

var (

	ErrUnexpectedSchema = errors.New("unexpected schema")

)

// URL is used to validate that value is a valid URL string. By default (if no schemas are passed),

// the function checks only for the http:// and https:// schemas. Use the schemas argument

// to configure the list of expected schemas. If an empty string is passed as a schema, then

// URL value may be treated as relative (without schema, e.g. "//example.com").

//

// If value is not a valid URL the function will return one of the errors:

//	• parsing error from url.Parse method if value cannot be parsed as an URL;

//	• ErrUnexpectedSchema if schema is not matching one of the listed schemas;

//	• ErrInvalid if value is not matching the regular expression.

func validateSchema(u *url.URL, schemas []string) error {

	for _, schema := range schemas {

		if schema == u.Scheme {

			return nil

		}

	}

	return ErrUnexpectedSchema

}