back/auth/auth.go


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package auth

import "fmt"

const (
	// Maximum number of bytes in a Username.
	MaxUsernameSize = 64
)

type Username string

func ValidiateUsername(s string) (Username, error) {
	if len(s) > MaxUsernameSize {
		return "", fmt.Errorf("username longer than %d bytes: %q", MaxUsernameSize, s)
	}
	return Username(s), nil
}