first commit

backend/internal/repository/api_key_cache.go

@@ -0,0 +1,93 @@
+package repository
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/redis/go-redis/v9"
+)
+
+const (
+	apiKeyRateLimitKeyPrefix = "apikey:ratelimit:"
+	apiKeyRateLimitDuration  = 24 * time.Hour
+	apiKeyAuthCachePrefix    = "apikey:auth:"
+)
+
+// apiKeyRateLimitKey generates the Redis key for API key creation rate limiting.
+func apiKeyRateLimitKey(userID int64) string {
+	return fmt.Sprintf("%s%d", apiKeyRateLimitKeyPrefix, userID)
+}
+
+func apiKeyAuthCacheKey(key string) string {
+	return fmt.Sprintf("%s%s", apiKeyAuthCachePrefix, key)
+}
+
+type apiKeyCache struct {
+	rdb *redis.Client
+}
+
+func NewAPIKeyCache(rdb *redis.Client) service.APIKeyCache {
+	return &apiKeyCache{rdb: rdb}
+}
+
+func (c *apiKeyCache) GetCreateAttemptCount(ctx context.Context, userID int64) (int, error) {
+	key := apiKeyRateLimitKey(userID)
+	count, err := c.rdb.Get(ctx, key).Int()
+	if errors.Is(err, redis.Nil) {
+		return 0, nil
+	}
+	return count, err
+}
+
+func (c *apiKeyCache) IncrementCreateAttemptCount(ctx context.Context, userID int64) error {
+	key := apiKeyRateLimitKey(userID)
+	pipe := c.rdb.Pipeline()
+	pipe.Incr(ctx, key)
+	pipe.Expire(ctx, key, apiKeyRateLimitDuration)
+	_, err := pipe.Exec(ctx)
+	return err
+}
+
+func (c *apiKeyCache) DeleteCreateAttemptCount(ctx context.Context, userID int64) error {
+	key := apiKeyRateLimitKey(userID)
+	return c.rdb.Del(ctx, key).Err()
+}
+
+func (c *apiKeyCache) IncrementDailyUsage(ctx context.Context, apiKey string) error {
+	return c.rdb.Incr(ctx, apiKey).Err()
+}
+
+func (c *apiKeyCache) SetDailyUsageExpiry(ctx context.Context, apiKey string, ttl time.Duration) error {
+	return c.rdb.Expire(ctx, apiKey, ttl).Err()
+}
+
+func (c *apiKeyCache) GetAuthCache(ctx context.Context, key string) (*service.APIKeyAuthCacheEntry, error) {
+	val, err := c.rdb.Get(ctx, apiKeyAuthCacheKey(key)).Bytes()
+	if err != nil {
+		return nil, err
+	}
+	var entry service.APIKeyAuthCacheEntry
+	if err := json.Unmarshal(val, &entry); err != nil {
+		return nil, err
+	}
+	return &entry, nil
+}
+
+func (c *apiKeyCache) SetAuthCache(ctx context.Context, key string, entry *service.APIKeyAuthCacheEntry, ttl time.Duration) error {
+	if entry == nil {
+		return nil
+	}
+	payload, err := json.Marshal(entry)
+	if err != nil {
+		return err
+	}
+	return c.rdb.Set(ctx, apiKeyAuthCacheKey(key), payload, ttl).Err()
+}
+
+func (c *apiKeyCache) DeleteAuthCache(ctx context.Context, key string) error {
+	return c.rdb.Del(ctx, apiKeyAuthCacheKey(key)).Err()
+}