package main
import (
"bytes"
"context"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
"syscall"
"github.com/sevlyar/go-daemon"
gfm "github.com/shurcooL/github_flavored_markdown"
"github.com/shurcooL/github_flavored_markdown/gfmstyle"
//blackfriday "gopkg.in/russross/blackfriday.v2"
)
var (
signal = flag.String("s", "", `send signal to the daemon
quit — graceful shutdown
stop — fast shutdown
reload — reloading the configuration file`)
)
const DOMAIN_NAME = "threefortiethofonehamster.com"
const HTML_HEADER = `
%s | %s
`
const HTML_FOOTER = `
`
func serveMarkdown(w http.ResponseWriter, r *http.Request, path string) {
if b, err := ioutil.ReadFile(path); err != nil {
w.WriteHeader(404)
w.Write([]byte(fmt.Sprintf("file %s not found", path)))
return
} else {
w.Header().Add("Content-Type", "text/html; charset=utf-8")
title := ""
if s := bytes.Index(b, []byte("# ")); s != -1 {
t := b[s+2:]
if e := bytes.Index(t, []byte("\n")); e != -1 {
t = t[:e]
title = string(t)
}
}
w.Write([]byte(fmt.Sprintf(HTML_HEADER, string(title), r.Host)))
html := gfm.Markdown(b)
w.Write(html)
w.Write([]byte(HTML_FOOTER))
}
}
func rootHandler(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
if r.URL.Path == "/" {
serveMarkdown(w, r, "static/README.md")
} else if strings.HasSuffix(r.URL.Path, ".md") {
if strings.Contains(r.URL.Path, "..") {
w.WriteHeader(403)
w.Write([]byte("\"..\" forbidden in URL"))
return
}
filepath := "static" + r.URL.Path
serveMarkdown(w, r, filepath)
} else {
http.ServeFile(w, r, "static"+r.URL.Path)
}
} else {
w.Write([]byte("unimplemented!"))
}
}
var (
shutdown chan struct{} = make(chan struct{})
serverShutdown chan struct{} = make(chan struct{})
)
func main() {
flag.Parse()
daemon.AddCommand(daemon.StringFlag(signal, "quit"), syscall.SIGQUIT, termHandler)
daemon.AddCommand(daemon.StringFlag(signal, "stop"), syscall.SIGTERM, termHandler)
daemon.AddCommand(daemon.StringFlag(signal, "reload"), syscall.SIGHUP, reloadHandler)
cntxt := &daemon.Context{
PidFileName: "/tmp/kelvinly-server-pid",
PidFilePerm: 0644,
LogFileName: "/tmp/kelvinly-server-log",
LogFilePerm: 0640,
WorkDir: "/home/kelvin/kelvinly-server/",
Umask: 027,
}
// TODO: figure out the daemonizing stuff
if len(daemon.ActiveFlags()) > 0 {
d, err := cntxt.Search()
if err != nil {
log.Fatalln("Unable to send signal to daemon:", err)
}
daemon.SendCommands(d)
return
}
d, err := cntxt.Reborn()
if err != nil {
log.Fatalln(err)
}
if d != nil {
return
}
defer cntxt.Release()
var redirect http.Server
var srv http.Server
go startRedirectServer(&redirect)
go startServer(&srv)
go func() {
<-shutdown
log.Println("shutting down server...")
if err := srv.Shutdown(context.Background()); err != nil {
log.Printf("server shutdown error: %v\n", err)
}
if err = redirect.Shutdown(context.Background()); err != nil {
log.Printf("redirect shutdown error: %v\n", err)
}
}()
err = daemon.ServeSignals()
if err != nil {
log.Println("Error: ", err)
}
log.Println("server terminated")
}
func termHandler(sig os.Signal) error {
log.Printf("sending shutdown signal...")
close(shutdown)
return daemon.ErrStop
}
func reloadHandler(sig os.Signal) error {
log.Printf("[WARN] reloading not supported yet")
return nil
}
func startServer(srv *http.Server) {
log.Print("installing handlers")
serveMux := http.NewServeMux()
serveMux.HandleFunc("/", rootHandler)
//serveMux.Handle("/certbot/", http.StripPrefix("/certbot/", http.FileServer(http.Dir("./certbot-tmp"))))
serveMux.Handle("/gfm/", http.StripPrefix("/gfm", http.FileServer(gfmstyle.Assets)))
serveMux.HandleFunc("/main.css", func(w http.ResponseWriter, r *http.Request) { http.ServeFile(w, r, "main.css") })
srv.Addr = ":8443"
srv.Handler = serveMux
log.Print("starting server")
log.Fatal(srv.ListenAndServeTLS("/etc/letsencrypt/live/"+DOMAIN_NAME+"/fullchain.pem",
"/etc/letsencrypt/live/"+DOMAIN_NAME+"/privkey.pem"))
close(serverShutdown)
}
func startRedirectServer(srv *http.Server) {
serveMux := http.NewServeMux()
// copied from https://gist.github.com/d-schmidt/587ceec34ce1334a5e60
serveMux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
target := "https://" + req.Host + req.URL.Path
if len(req.URL.RawQuery) > 0 {
target += "?" + req.URL.RawQuery
}
http.Redirect(w, req, target, http.StatusTemporaryRedirect)
})
srv.Addr = ":8080"
srv.Handler = serveMux
log.Print("starting server")
log.Fatal(srv.ListenAndServe())
close(serverShutdown)
}