Echo/main.go

package main

import (
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"regexp"
	"strconv"

	"github.com/joho/godotenv"
)

func main() {
	err := godotenv.Load()
	if err != nil {
		fmt.Println("Error loading .env file")
	}

	serverPort := os.Getenv("SERVER_PORT")
	if serverPort == "" {
		serverPort = "8080"
	}

	basePath := os.Getenv("BASE_PATH")
	if basePath == "" {
		basePath = "."
	}

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		if regexp.MustCompile(`\.\.\/?`).MatchString(r.URL.Path) {
			http.Error(w, "Forbidden", http.StatusForbidden)
			return
		}

		filePath := filepath.Join(basePath, r.URL.Path)
		http.ServeFile(w, r, filePath)
	})

	port, _ := strconv.Atoi(serverPort)
	fmt.Printf("Echo started with base path %s on port %d\n", basePath, port)
	http.ListenAndServe(":"+serverPort, nil)
}