mmg/main.go

package main

import (
	"flag"
	"fmt"
	"log"
	"math/rand"
	"net/http"
	"os"
	"time"

	"github.com/gorilla/sessions"
)

const MAX = 12

var port = flag.Int("port", 8000, "listen on this port")

var store = sessions.NewCookieStore([]byte(os.Getenv("MMG_SECRET_KEY")))
var statics map[string][]byte

func main() {
	statics = map[string][]byte{
		"/":          staticIndexHtml,
		"/jquery.js": staticJqueryJs,
		"/math.css":  staticMathCss,
		"/math.js":   staticMathJs,
		"/addsub/":   staticAddsubHtml,
		"/mul/":      staticMulHtml,
	}
	rand.Seed(time.Now().UTC().UnixNano())
	flag.Parse()
	http.HandleFunc("/api/v0/addsub/problem/", addsub)
	http.HandleFunc("/api/v0/mul/problem/", mul)
	http.HandleFunc("/api/v0/attempt/", attempt)
	http.HandleFunc(
		"/",
		static,
	)
	http.HandleFunc(
		"/reset/",
		reset,
	)

	hostname, err := os.Hostname()
	if err != nil {
		log.Fatal("problem getting hostname:", err)
	}
	log.Printf("serving at: http://%s:%d/", hostname, *port)

	if err := http.ListenAndServe(fmt.Sprintf(":%d", *port), nil); err != nil {
		log.Fatal("ListenAndServe:", err)
	}
}

func static(w http.ResponseWriter, req *http.Request) {
	if content, ok := statics[req.URL.Path]; !ok {
		http.Error(w, "file not found", http.StatusNotFound)
		return
	} else {
		if req.URL.Path == "/math.css" {
			w.Header().Set("Content-Type", "text/css")
		}
		_, err := w.Write(content)
		if err != nil {
			http.Error(w, "problem writing response", http.StatusInternalServerError)
			return
		}
	}
}