199 lines
5.0 KiB
Go
199 lines
5.0 KiB
Go
package main
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import (
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"bytes"
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"context"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"strings"
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"syscall"
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"github.com/sevlyar/go-daemon"
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gfm "github.com/shurcooL/github_flavored_markdown"
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"github.com/shurcooL/github_flavored_markdown/gfmstyle"
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//blackfriday "gopkg.in/russross/blackfriday.v2"
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)
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var (
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signal = flag.String("s", "", `send signal to the daemon
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quit — graceful shutdown
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stop — fast shutdown
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reload — reloading the configuration file`)
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)
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const DOMAIN_NAME = "threefortiethofonehamster.com"
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const HTML_HEADER = `<!doctype html5>
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<html>
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<head>
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<meta charset=utf-8>
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<title>%s | %s</title>
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<link href=/gfm/gfm.css media=all rel=stylesheet type=text/css></link>
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<link href=/main.css media=all rel=stylesheet type=text/css></link>
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</head>
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<body>
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<article class="markdown-body entry-content" style="padding:2em;">
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`
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const HTML_FOOTER = ` </article>
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<footer>
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by Kelvin Ly, source available <a href="https://github.com/cactorium/kelvinly-server">here</a>
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</footer>
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</body>
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</html>`
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func serveMarkdown(w http.ResponseWriter, r *http.Request, path string) {
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if b, err := ioutil.ReadFile(path); err != nil {
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w.WriteHeader(404)
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w.Write([]byte(fmt.Sprintf("file %s not found", path)))
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return
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} else {
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w.Header().Add("Content-Type", "text/html; charset=utf-8")
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title := ""
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if s := bytes.Index(b, []byte("# ")); s != -1 {
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t := b[s+2:]
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if e := bytes.Index(t, []byte("\n")); e != -1 {
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t = t[:e]
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title = string(t)
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}
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}
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w.Write([]byte(fmt.Sprintf(HTML_HEADER, string(title), r.Host)))
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html := gfm.Markdown(b)
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w.Write(html)
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w.Write([]byte(HTML_FOOTER))
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}
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}
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func rootHandler(w http.ResponseWriter, r *http.Request) {
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if r.Method == "GET" {
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if r.URL.Path == "/" {
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serveMarkdown(w, r, "static/README.md")
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} else if strings.HasSuffix(r.URL.Path, ".md") {
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if strings.Contains(r.URL.Path, "..") {
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w.WriteHeader(403)
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w.Write([]byte("\"..\" forbidden in URL"))
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return
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}
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filepath := "static" + r.URL.Path
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serveMarkdown(w, r, filepath)
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} else {
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http.ServeFile(w, r, "static"+r.URL.Path)
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}
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} else {
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w.Write([]byte("unimplemented!"))
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}
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}
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var (
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shutdown chan struct{} = make(chan struct{})
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serverShutdown chan struct{} = make(chan struct{})
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)
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func main() {
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flag.Parse()
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daemon.AddCommand(daemon.StringFlag(signal, "quit"), syscall.SIGQUIT, termHandler)
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daemon.AddCommand(daemon.StringFlag(signal, "stop"), syscall.SIGTERM, termHandler)
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daemon.AddCommand(daemon.StringFlag(signal, "reload"), syscall.SIGHUP, reloadHandler)
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cntxt := &daemon.Context{
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PidFileName: "/tmp/kelvinly-server-pid",
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PidFilePerm: 0644,
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LogFileName: "/tmp/kelvinly-server-log",
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LogFilePerm: 0640,
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WorkDir: "/home/kelvin/kelvinly-server/",
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Umask: 027,
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}
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// TODO: figure out the daemonizing stuff
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if len(daemon.ActiveFlags()) > 0 {
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d, err := cntxt.Search()
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if err != nil {
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log.Fatalln("Unable to send signal to daemon:", err)
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}
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daemon.SendCommands(d)
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return
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}
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d, err := cntxt.Reborn()
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if err != nil {
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log.Fatalln(err)
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}
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if d != nil {
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return
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}
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defer cntxt.Release()
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var redirect http.Server
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var srv http.Server
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go startRedirectServer(&redirect)
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go startServer(&srv)
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go func() {
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<-shutdown
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log.Println("shutting down server...")
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if err := srv.Shutdown(context.Background()); err != nil {
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log.Printf("server shutdown error: %v\n", err)
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}
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if err = redirect.Shutdown(context.Background()); err != nil {
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log.Printf("redirect shutdown error: %v\n", err)
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}
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}()
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err = daemon.ServeSignals()
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if err != nil {
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log.Println("Error: ", err)
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}
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log.Println("server terminated")
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}
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func termHandler(sig os.Signal) error {
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log.Printf("sending shutdown signal...")
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close(shutdown)
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return daemon.ErrStop
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}
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func reloadHandler(sig os.Signal) error {
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log.Printf("[WARN] reloading not supported yet")
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return nil
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}
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func startServer(srv *http.Server) {
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log.Print("installing handlers")
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serveMux := http.NewServeMux()
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serveMux.HandleFunc("/", rootHandler)
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//serveMux.Handle("/certbot/", http.StripPrefix("/certbot/", http.FileServer(http.Dir("./certbot-tmp"))))
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serveMux.Handle("/gfm/", http.StripPrefix("/gfm", http.FileServer(gfmstyle.Assets)))
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serveMux.HandleFunc("/main.css", func(w http.ResponseWriter, r *http.Request) { http.ServeFile(w, r, "main.css") })
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srv.Addr = ":8443"
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srv.Handler = serveMux
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log.Print("starting server")
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log.Fatal(srv.ListenAndServeTLS("/etc/letsencrypt/live/"+DOMAIN_NAME+"/fullchain.pem",
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"/etc/letsencrypt/live/"+DOMAIN_NAME+"/privkey.pem"))
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close(serverShutdown)
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}
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func startRedirectServer(srv *http.Server) {
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serveMux := http.NewServeMux()
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// copied from https://gist.github.com/d-schmidt/587ceec34ce1334a5e60
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serveMux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
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target := "https://" + req.Host + req.URL.Path
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if len(req.URL.RawQuery) > 0 {
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target += "?" + req.URL.RawQuery
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}
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http.Redirect(w, req, target, http.StatusTemporaryRedirect)
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})
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srv.Addr = ":8080"
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srv.Handler = serveMux
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log.Print("starting server")
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log.Fatal(srv.ListenAndServe())
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close(serverShutdown)
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}
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