chore: initial public snapshot for github upload

llm-gateway-competitors/sub2api-tar/backend/internal/repository/identity_cache.go

@@ -0,0 +1,75 @@
+package repository
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/redis/go-redis/v9"
+)
+
+const (
+	fingerprintKeyPrefix   = "fingerprint:"
+	fingerprintTTL         = 7 * 24 * time.Hour // 7天，配合每24小时懒续期可保持活跃账号永不过期
+	maskedSessionKeyPrefix = "masked_session:"
+	maskedSessionTTL       = 15 * time.Minute
+)
+
+// fingerprintKey generates the Redis key for account fingerprint cache.
+func fingerprintKey(accountID int64) string {
+	return fmt.Sprintf("%s%d", fingerprintKeyPrefix, accountID)
+}
+
+// maskedSessionKey generates the Redis key for masked session ID cache.
+func maskedSessionKey(accountID int64) string {
+	return fmt.Sprintf("%s%d", maskedSessionKeyPrefix, accountID)
+}
+
+type identityCache struct {
+	rdb *redis.Client
+}
+
+func NewIdentityCache(rdb *redis.Client) service.IdentityCache {
+	return &identityCache{rdb: rdb}
+}
+
+func (c *identityCache) GetFingerprint(ctx context.Context, accountID int64) (*service.Fingerprint, error) {
+	key := fingerprintKey(accountID)
+	val, err := c.rdb.Get(ctx, key).Result()
+	if err != nil {
+		return nil, err
+	}
+	var fp service.Fingerprint
+	if err := json.Unmarshal([]byte(val), &fp); err != nil {
+		return nil, err
+	}
+	return &fp, nil
+}
+
+func (c *identityCache) SetFingerprint(ctx context.Context, accountID int64, fp *service.Fingerprint) error {
+	key := fingerprintKey(accountID)
+	val, err := json.Marshal(fp)
+	if err != nil {
+		return err
+	}
+	return c.rdb.Set(ctx, key, val, fingerprintTTL).Err()
+}
+
+func (c *identityCache) GetMaskedSessionID(ctx context.Context, accountID int64) (string, error) {
+	key := maskedSessionKey(accountID)
+	val, err := c.rdb.Get(ctx, key).Result()
+	if err != nil {
+		if err == redis.Nil {
+			return "", nil
+		}
+		return "", err
+	}
+	return val, nil
+}
+
+func (c *identityCache) SetMaskedSessionID(ctx context.Context, accountID int64, sessionID string) error {
+	key := maskedSessionKey(accountID)
+	return c.rdb.Set(ctx, key, sessionID, maskedSessionTTL).Err()
+}