Blizzard
67 lines
1.4 KiB
Go
67 lines
1.4 KiB
Go
package captcha
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import (
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"context"
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"time"
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"github.com/mojocn/base64Captcha"
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"github.com/redis/go-redis/v9"
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)
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var store base64Captcha.Store
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// InitWithRedis 使用 Redis 存储初始化验证码
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func InitWithRedis(rdb *redis.Client) {
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store = &redisStore{rdb: rdb, expiration: 5 * time.Minute}
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}
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// Generate 生成图形验证码
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func Generate() (id string, b64s string, err error) {
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if store == nil {
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store = base64Captcha.DefaultMemStore // fallback
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}
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driver := base64Captcha.NewDriverDigit(80, 240, 5, 0.7, 80)
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captcha := base64Captcha.NewCaptcha(driver, store)
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id, b64s, _, err = captcha.Generate()
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return
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}
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// Verify 验证验证码（验证后自动清除）
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func Verify(id, answer string) bool {
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if store == nil {
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return false
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}
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return store.Verify(id, answer, true)
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}
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// =============== Redis Store 实现 ===============
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const keyPrefix = "captcha:"
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type redisStore struct {
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rdb *redis.Client
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expiration time.Duration
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}
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func (s *redisStore) Set(id string, value string) error {
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return s.rdb.Set(context.Background(), keyPrefix+id, value, s.expiration).Err()
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}
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func (s *redisStore) Get(id string, clear bool) string {
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ctx := context.Background()
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key := keyPrefix + id
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val, err := s.rdb.Get(ctx, key).Result()
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if err != nil {
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return ""
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}
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if clear {
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s.rdb.Del(ctx, key)
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}
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return val
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}
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func (s *redisStore) Verify(id, answer string, clear bool) bool {
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v := s.Get(id, clear)
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return v == answer
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}
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