main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"path/filepath"

	"github.com/gorilla/mux"
	"github.com/joho/godotenv"
	"github.com/rojasleon/playground/db"
	"github.com/rojasleon/playground/routes"
)

// spaHandler implements the http.Handler interface, so we can use it
// to respond to HTTP requests. The path to the static directory and
// path to the index file within that static directory are used to
// serve the SPA in the given static directory.
type spaHandler struct {
	staticPath string
	indexPath  string
}

// ServeHTTP inspects the URL path to locate a file within the static dir
// on the SPA handler. If a file is found, it will be served. If not, the
// file located at the index path on the SPA handler will be served. This
// is suitable behavior for serving an SPA (single page application).
func (h spaHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// get the absolute path to prevent directory traversal
	path, err := filepath.Abs(r.URL.Path)
	if err != nil {
		// if we failed to get the absolute path respond with a 400 bad request
		// and stop
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	// prepend the path with the path to the static directory
	path = filepath.Join(h.staticPath, path)

	// check whether a file exists at the given path
	_, err = os.Stat(path)
	if os.IsNotExist(err) {
		// file does not exist, serve index.html
		http.ServeFile(w, r, filepath.Join(h.staticPath, h.indexPath))
		return
	} else if err != nil {
		// if we got an error (that wasn't that the file doesn't exist) stating the
		// file, return a 500 internal server error and stop
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	// otherwise, use http.FileServer to serve the static dir
	http.FileServer(http.Dir(h.staticPath)).ServeHTTP(w, r)
}

func main() {
	godotenv.Load()

	port := os.Getenv("PORT")

	if port == "" {
		port = "3000"
	}

	db.Connect()
	defer db.Disconnect()
	fmt.Println("Connected to mongo db")

	r := mux.NewRouter()

	r.HandleFunc("/api/bundler", routes.Create).Methods("POST")
	r.HandleFunc("/api/playground", routes.FetchPlayground).Methods("GET")
	r.HandleFunc("/api/playground", routes.CreatePlayground).Methods("POST")

	spa := spaHandler{staticPath: "client/build", indexPath: "index.html"}
	r.PathPrefix("/").Handler(spa)

	fmt.Println("Listening on port", port)
	log.Fatal(http.ListenAndServe(":"+port, r))
}