增加图形验证码的功能

captcha/redis_store.go

@@ -0,0 +1,42 @@
+package captcha
+
+import (
+	"context"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+const codeKeyPrefix = "captcha:code:"
+
+// redisStore 实现 base64Captcha.Store，将验证码答案存入 Redis。
+type redisStore struct {
+	client *redis.Client
+	ttl    time.Duration
+}
+
+func newRedisStore(client *redis.Client, ttl time.Duration) *redisStore {
+	return &redisStore{client: client, ttl: ttl}
+}
+
+func (s *redisStore) Set(id string, value string) error {
+	return s.client.Set(context.Background(), codeKeyPrefix+id, value, s.ttl).Err()
+}
+
+func (s *redisStore) Get(id string, clear bool) string {
+	ctx := context.Background()
+	key := codeKeyPrefix + id
+	val, err := s.client.Get(ctx, key).Result()
+	if err != nil {
+		return ""
+	}
+	if clear {
+		_ = s.client.Del(ctx, key).Err()
+	}
+	return val
+}
+
+func (s *redisStore) Verify(id, answer string, clear bool) bool {
+	val := s.Get(id, clear)
+	return val != "" && val == answer
+}