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package main
import (
"flag"
"fmt"
"golang.org/x/sys/unix"
"html/template"
"io/fs"
"log"
"net"
"net/http"
"os"
"path"
fp "path/filepath"
"strings"
)
// Flags
var (
host = "localhost"
port = "80"
chroot = "/var/www/"
user = "www"
group = "www"
root = "/htdocs/samanthony.xyz/"
)
func init() {
flag.StringVar(&host, "host", host, "")
flag.StringVar(&port, "port", port, "")
flag.StringVar(&chroot, "chroot", chroot, "")
flag.StringVar(&user, "user", user, "")
flag.StringVar(&group, "group", group, "")
flag.StringVar(&root, "root", root, "")
flag.Parse()
}
// Must lookup the hostname before entering the chroot.
var addr = ""
func init() {
// host is an ip address
if ip := net.ParseIP(host); ip != nil {
addr = ip.String()
} else { // host is a domain name
addrs, err := net.LookupHost(host)
if err != nil {
log.Fatal(err)
}
for _, a := range addrs {
if ip := net.ParseIP(a); ip != nil {
if v4 := ip.To4(); v4 != nil {
addr = v4.String()
}
}
}
if addr == "" {
log.Fatalf("No ipv4 address bound to %s", host)
}
}
}
var (
uid int
gid int
)
func init() {
var err error
uid, err = uidOf(user)
if err != nil {
log.Fatal(err)
}
gid, err = gidOf(group)
if err != nil {
log.Fatal(err)
}
}
// Enter chroot
func init() {
if err := unix.Chroot(chroot); err != nil {
log.Fatalf("chroot: %s: %v", chroot, err)
}
}
// Build templates
var tmpl = make(map[string]*template.Template)
func init() {
err := fp.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
if fp.Clean(path) == fp.Clean(root) ||
fp.Ext(path) != ".html" ||
path == fp.Join(root, "base.html") {
return nil
}
label := path[len(fp.Clean(root)):]
tmpl[label] = template.Must(template.ParseFiles(
fp.Join(root, "base.html"), path))
return nil
})
if err != nil {
log.Fatal(err)
}
}
// Template data
type Page struct {
Nav Nav
}
type Nav struct {
ThisSection string
Links []NavLink
}
type NavLink struct {
Href string
Label string
}
var nav = Nav{
Links: []NavLink{
{"/", "samanthony.xyz"},
{"/software/", "software"},
},
}
func rootHandler(w http.ResponseWriter, r *http.Request) {
if err := dropPerms(uid, gid); err != nil {
log.Println(err)
code := http.StatusInternalServerError
http.Error(w, http.StatusText(code), code)
return
}
reqPath := r.URL.Path
// If request directory, serve index.html.
// ie. /software -> /software/index.html
if info, err := os.Stat(fp.Join(root, reqPath)); err == nil {
if info.IsDir() {
reqPath = path.Join(reqPath, "index.html")
}
} else if os.IsNotExist(err) {
http.NotFound(w, r)
return
} else {
log.Println(err)
code := http.StatusInternalServerError
http.Error(w, http.StatusText(code), code)
return
}
if t, ok := tmpl[reqPath]; ok {
thisSection := ""
for _, link := range nav.Links {
if strings.HasPrefix(reqPath, link.Href) {
thisSection = link.Href
}
}
nav := nav
nav.ThisSection = thisSection
page := Page{nav}
err := t.Execute(w, page)
if err != nil {
log.Println(err)
code := http.StatusInternalServerError
http.Error(w, http.StatusText(code), code)
return
}
} else {
http.ServeFile(w, r, fp.Join(root, reqPath))
}
}
func main() {
http.HandleFunc("/", rootHandler)
http.Handle("/.well-known/acme-challenge/",
http.StripPrefix(
"/.well-known/acme-challenge/",
http.FileServer(http.Dir("/acme/")),
),
)
log.Printf("Listening on %s:%s\n", addr, port)
log.Fatal(http.ListenAndServe(fmt.Sprintf("%s:%s", addr, port), nil))
}
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