base-golang/pkg/captcha/base64.go

package captcha

import (
	"git.bvbej.com/bvbej/base-golang/pkg/cache"
	"github.com/mojocn/base64Captcha"
	"go.uber.org/zap"
	"strings"
	"time"
)

const RedisKeyPrefixCaptcha = "captcha:base64:"

var _ base64Captcha.Store = (*store)(nil)

type store struct {
	cache  cache.Repo
	ttl    time.Duration
	logger *zap.Logger
}

func (s *store) Set(id string, value string) error {
	err := s.cache.Set(RedisKeyPrefixCaptcha+id, value, s.ttl)
	if err != nil {
		return err
	}
	return nil
}

func (s *store) Get(id string, clear bool) string {
	value, err := s.cache.Get(RedisKeyPrefixCaptcha + id)
	if err == nil && clear {
		s.cache.Del(RedisKeyPrefixCaptcha + id)
	}
	return value
}

func (s *store) Verify(id, answer string, clear bool) bool {
	value := s.Get(id, clear)
	if value == "" || answer == "" {
		return false
	}
	return strings.ToLower(value) == strings.ToLower(answer)
}

func NewStore(cache cache.Repo, ttl time.Duration) base64Captcha.Store {
	return &store{
		cache: cache,
		ttl:   ttl,
	}
}

var _ Captcha = (*captcha)(nil)

type Captcha interface {
	Generate() (id, b64s string, err error)
	Verify(id, value string) bool
}

type captcha struct {
	conf  *base64Captcha.DriverString
	store base64Captcha.Store
}

func NewCaptcha(store base64Captcha.Store, height, width, length int) Captcha {
	conf := &base64Captcha.DriverString{
		Height:          height,
		Width:           width,
		NoiseCount:      length * 2,
		ShowLineOptions: base64Captcha.OptionShowHollowLine,
		Length:          length,
		Source:          "ABCDEFGHIJKMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz0123456789",
	}
	return &captcha{
		conf:  conf,
		store: store,
	}
}

func (c *captcha) Generate() (id, b64s string, err error) {
	driver := c.conf.ConvertFonts()
	newCaptcha := base64Captcha.NewCaptcha(driver, c.store)
	return newCaptcha.Generate()
}

func (c *captcha) Verify(id, value string) bool {
	return c.store.Verify(id, value, true)
}