justcaptcha/cmd/justcaptchad/main.go

package main

import (
	"flag"
	"fmt"
	"justcaptcha/internal/http"
	"log"
	"net/netip"
	"os"
	"os/signal"
	"strings"
	"syscall"
	"time"
)

var version string

var listenAddress *string = flag.String("listen", "/var/run/justcaptcha/sock", "listen address (ip:port|unix_path)")
var captchaExpiry *time.Duration = flag.Duration("expiry", 10*time.Minute, "CAPTCHA expiry in format XX{s,m,h}, e.g. 5m, 300s")
var showVersion *bool = flag.Bool("v", false, "show version")

func main() {
	flag.Parse()
	log.SetFlags(0)

	if *showVersion {
		fmt.Println("justcaptchad ver.", version, "\nCopyright (c) 2022 Alexander \"Arav\" Andreev <me@arav.top>")
		return
	}

	hand := http.NewCaptchaHandlers(*captchaExpiry)
	srv := http.NewHttpServer()

	srv.POST("/", hand.New)
	srv.POST("/:captcha", hand.Solve)
	srv.GET("/:captcha", hand.IsSolved)
	srv.GET("/:captcha/image", hand.Image)

	var network string
	if !strings.ContainsRune(*listenAddress, ':') {
		network = "unix"
		defer os.Remove(*listenAddress)
	} else {
		ap, err := netip.ParseAddrPort(*listenAddress)
		if err != nil {
			log.Fatalln(err)
		}

		if ap.Addr().Is4() {
			network = "tcp4"
		} else if ap.Addr().Is6() {
			network = "tcp6"
		}
	}

	if err := srv.Start(network, *listenAddress); err != nil {
		log.Fatalln("failed to start a server:", err)
	}

	doneSignal := make(chan os.Signal, 1)
	signal.Notify(doneSignal, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)

	<-doneSignal

	if err := srv.Stop(); err != nil {
		log.Fatalln("failed to properly shutdown a server:", err)
	}
}