初步实现鉴权

Co-authored-by: Copilot <copilot@github.com>

internal/config/config.go

@@ -0,0 +1,78 @@
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	defaultHost             = "127.0.0.1"
+	defaultPort             = "2005"
+	defaultDBPath           = "./hugs_proxy.db"
+	defaultTokenTTLString   = "30d"
+	defaultBusyTimeoutMilli = 5000
+)
+
+type Config struct {
+	Host            string
+	Port            string
+	DBPath          string
+	DefaultTokenTTL time.Duration
+	BusyTimeoutMS   int
+}
+
+func Load() Config {
+	host := getenvOrDefault("HUGS_PROXY_HOST", defaultHost)
+	port := getenvOrDefault("HUGS_PROXY_PORT", defaultPort)
+	dbPath := getenvOrDefault("HUGS_PROXY_DB_PATH", defaultDBPath)
+	ttlRaw := getenvOrDefault("HUGS_PROXY_DEFAULT_TOKEN_TTL", defaultTokenTTLString)
+	busyTimeout := getenvIntOrDefault("HUGS_PROXY_DB_BUSY_TIMEOUT_MS", defaultBusyTimeoutMilli)
+
+	ttl, err := ParseExpiryDuration(ttlRaw)
+	if err != nil {
+		ttl, _ = ParseExpiryDuration(defaultTokenTTLString)
+	}
+
+	return Config{
+		Host:            host,
+		Port:            port,
+		DBPath:          dbPath,
+		DefaultTokenTTL: ttl,
+		BusyTimeoutMS:   busyTimeout,
+	}
+}
+
+func ParseExpiryDuration(s string) (time.Duration, error) {
+	s = strings.TrimSpace(strings.ToLower(s))
+	if strings.HasSuffix(s, "d") {
+		daysPart := strings.TrimSuffix(s, "d")
+		days, err := strconv.Atoi(daysPart)
+		if err != nil {
+			return 0, err
+		}
+		return time.Duration(days) * 24 * time.Hour, nil
+	}
+	return time.ParseDuration(s)
+}
+
+func getenvOrDefault(key string, fallback string) string {
+	v := strings.TrimSpace(os.Getenv(key))
+	if v == "" {
+		return fallback
+	}
+	return v
+}
+
+func getenvIntOrDefault(key string, fallback int) int {
+	v := strings.TrimSpace(os.Getenv(key))
+	if v == "" {
+		return fallback
+	}
+	n, err := strconv.Atoi(v)
+	if err != nil {
+		return fallback
+	}
+	return n
+}