captcha

type Captcha struct {

	// url prefix for captcha image
	URLPrefix string

	// specify captcha id input field name
	FieldIDName string
	// specify captcha result input field name
	FieldCaptchaName string

	// captcha image width and height
	StdWidth  int
	StdHeight int

	// captcha chars nums
	ChallengeNums int

	// captcha expiration seconds
	Expiration time.Duration

	// cache key prefix
	CachePrefix string
	// contains filtered or unexported fields
}

type Image struct {
	*image.Paletted
	// contains filtered or unexported fields
}

type Storage interface {
	// Get a cached value by key.
	Get(ctx context2.Context, key string) (interface{}, error)
	// Set a cached value with key and expire time.
	Put(ctx context2.Context, key string, val interface{}, timeout time.Duration) error
	// Delete cached value by key.
	Delete(ctx context2.Context, key string) error
}