validator

type Config struct {
	PasswordLenMin        uint
	PasswordLenMax        uint
	EmailLenMax           uint
	PostContentsLenMin    uint
	PostContentsLenMax    uint
	PostTitleLenMin       uint
	PostTitleLenMax       uint
	ReactionMessageLenMin uint
	ReactionMessageLenMax uint
	UserDisplayNameLenMin uint
	UserDisplayNameLenMax uint
}

type Validator interface {
	// Email returns an error if the given email address is invalid,
	// otherwise returns nil
	Email(v string) error

	// Password returns an error if the given password is invalid,
	// otherwise returns nil
	Password(v string) error

	// PostContents returns an error if the given post contents are invalid,
	// otherwise returns nil
	PostContents(v string) error

	// PostTitle returns an error if the given post title is invalid,
	// otherwise returns nil
	PostTitle(v string) error

	// ReactionMessage returns an error if the given reaction message is
	// invalid, otherwise returns nil
	ReactionMessage(v string) error

	// UserDisplayName returns an error if the given user display name is
	// invalid, otherwise returns nil
	UserDisplayName(v string) error
}