Add backend foundation and config-driven workbench

backend/internal/app/config.go

@@ -0,0 +1,73 @@
+package app
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+type Config struct {
+	AppEnv              string
+	HTTPAddr            string
+	DatabaseURL         string
+	JWTIssuer           string
+	JWTAccessSecret     string
+	JWTAccessTTL        time.Duration
+	RefreshTTL          time.Duration
+	SMSCodeTTL          time.Duration
+	SMSCodeCooldown     time.Duration
+	SMSProvider         string
+	DevSMSCode          string
+	WechatMiniAppID     string
+	WechatMiniSecret    string
+	WechatMiniDevPrefix string
+	LocalEventDir       string
+	AssetBaseURL        string
+}
+
+func LoadConfigFromEnv() (Config, error) {
+	cfg := Config{
+		AppEnv:              getEnv("APP_ENV", "development"),
+		HTTPAddr:            getEnv("HTTP_ADDR", ":8080"),
+		DatabaseURL:         os.Getenv("DATABASE_URL"),
+		JWTIssuer:           getEnv("JWT_ISSUER", "cmr-backend"),
+		JWTAccessSecret:     getEnv("JWT_ACCESS_SECRET", "change-me-in-production"),
+		JWTAccessTTL:        getDurationEnv("JWT_ACCESS_TTL", 2*time.Hour),
+		RefreshTTL:          getDurationEnv("AUTH_REFRESH_TTL", 30*24*time.Hour),
+		SMSCodeTTL:          getDurationEnv("AUTH_SMS_CODE_TTL", 10*time.Minute),
+		SMSCodeCooldown:     getDurationEnv("AUTH_SMS_COOLDOWN", 60*time.Second),
+		SMSProvider:         getEnv("AUTH_SMS_PROVIDER", "console"),
+		DevSMSCode:          os.Getenv("AUTH_DEV_SMS_CODE"),
+		WechatMiniAppID:     getEnv("WECHAT_MINI_APP_ID", ""),
+		WechatMiniSecret:    getEnv("WECHAT_MINI_APP_SECRET", ""),
+		WechatMiniDevPrefix: getEnv("WECHAT_MINI_DEV_PREFIX", "dev-"),
+		LocalEventDir:       getEnv("LOCAL_EVENT_DIR", filepath.Clean("..\\event")),
+		AssetBaseURL:        getEnv("ASSET_BASE_URL", "https://oss-mbh5.colormaprun.com/gotomars"),
+	}
+
+	if cfg.DatabaseURL == "" {
+		return Config{}, fmt.Errorf("DATABASE_URL is required")
+	}
+	if cfg.JWTAccessSecret == "" {
+		return Config{}, fmt.Errorf("JWT_ACCESS_SECRET is required")
+	}
+
+	return cfg, nil
+}
+
+func getEnv(key, fallback string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return fallback
+}
+
+func getDurationEnv(key string, fallback time.Duration) time.Duration {
+	if value := os.Getenv(key); value != "" {
+		if parsed, err := time.ParseDuration(value); err == nil {
+			return parsed
+		}
+	}
+	return fallback
+}