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kaidan
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
<https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Lesser General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
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To protect your rights, we need to make restrictions that forbid
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you have. You must make sure that they, too, receive or can get the
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We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
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The precise terms and conditions for copying, distribution and
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GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
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NO WARRANTY
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OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
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YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
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convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Moe Ghoul>, 1 April 1989
Moe Ghoul, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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# kaidan
japanese for *stairs*. a minimal, fast file index server.
single static binary. TOML config. sortable listings (name, type, size,
modified).
## build
```sh
CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o kaidan .
```
## run
```sh
./kaidan -config config.toml
```
## license
GPL-2.0

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>about · kaidan</title>
<link rel="icon" href="/favicon.ico">
<style>
body {
background: #1a1a1a;
color: #e0e0e0;
font: 14px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
margin: 0;
padding: 24px;
max-width: 1200px;
margin-inline: auto;
}
a {
color: #8ab4f8;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
h1 {
font-size: 16px;
color: #e0e0e0;
margin: 0 0 16px;
}
p {
color: #666;
line-height: 1.6;
}
code {
background: #2a2a2a;
border: 1px solid #333;
padding: 2px 6px;
color: #e0e0e0;
}
footer {
margin-top: 32px;
color: #666;
letter-spacing: .08em;
}
</style>
</head>
<body>
<h1>kaidan</h1>
<p>as "stairs" in japanese.</p>
<p>a minimal, fast file index server. serves a directory tree over http.
every listing includes a ready-to-run <code>wget</code> command that
mirrors that directory recursively into your current folder.</p>
<p>licensed under the <a href="https://www.gnu.org/licenses/old-licenses/gpl-2.0.html">GPL 2.0</a>.
source available <a href="https://git.stairs.lat/nix/kaidan">here</a>.</p>
<p><a href="/">back to index</a></p>
<footer>kaidan 1.0</footer>
</body>
</html>

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>{{.Path}} kaidan</title>
<link rel="icon" href="/favicon.ico">
<style>
body {
background: #1a1a1a;
color: #e0e0e0;
font: 14px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
margin: 0;
padding: 24px;
max-width: 1200px;
margin-inline: auto;
}
a {
color: inherit;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
.dir a {
color: #8ab4f8;
}
.crumbs {
margin-bottom: 12px;
color: #666;
}
.crumbs b {
color: #e0e0e0;
font-weight: normal;
}
table {
border-collapse: collapse;
width: 100%;
}
th {
text-align: left;
padding: 6px 10px;
border-bottom: 1px solid #333;
white-space: nowrap;
}
th a {
color: #666;
}
th a:hover {
color: #e0e0e0;
text-decoration: none;
}
td {
padding: 6px 10px;
border-bottom: 1px solid #333;
}
tr.dir:hover td {
background: #2a2a2a;
}
.num {
text-align: right;
color: #666;
white-space: nowrap;
}
td:first-child a {
overflow-wrap: anywhere;
}
.wrap {
overflow-x: auto;
}
.wget {
margin-top: 8px;
background: #2a2a2a;
border: 1px solid #333;
padding: 10px 14px;
color: #e0e0e0;
user-select: all;
overflow-wrap: anywhere;
}
.lbl {
color: #666;
font-size: 12px;
margin-top: 20px;
letter-spacing: .08em;
}
footer {
margin-top: 32px;
color: #666;
letter-spacing: .08em;
}
footer a {
color: #666;
}
footer a:hover {
color: #8ab4f8;
text-decoration: none;
}
.empty {
color: #666;
padding: 16px 10px;
}
@media (max-width: 600px) {
body {
padding: 12px;
font-size: 13px;
}
td,
th {
padding: 5px 6px;
}
.mod {
display: none;
}
.wget {
font-size: 12px;
}
}
</style>
</head>
<body>
<nav class="crumbs">{{range $i, $c := .Crumbs}}{{if $i}} / {{end}}<a href="{{$c.URL}}">{{$c.Name}}</a>{{end}}</nav>
<div class="wrap">
<table>
<thead><tr>{{range .Headers}}<th><a href="{{.URL}}">{{.Label}}{{if .Active}}{{if .Desc}} ▼{{else}} ▲{{end}}{{end}}</a></th>{{end}}</tr></thead>
<tbody>
{{if .HasParent}}<tr><td><a href="../">../</a></td><td class="num">-</td><td class="num"></td><td class="num mod"></td></tr>{{end}}
{{range .Rows}}
<tr{{if .IsDir}} class="dir"{{end}}>
<td><a href="{{.URL}}"{{if not .IsDir}} download{{end}}>{{.Name}}</a></td>
<td class="num">{{.Type}}</td>
<td class="num">{{if .IsDir}}-{{else}}{{.SizeS}}{{end}}</td>
<td class="num mod">{{.ModS}}</td>
</tr>
{{else}}<tr><td colspan="4" class="empty">empty directory</td></tr>{{end}}
</tbody>
</table>
</div>
<div class="lbl">Download this directory</div>
<div class="wget">{{.Wget}}</div>
<footer><a href="/about">{{.Footer}}</a></footer>
</body>
</html>

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package main
import (
"errors"
"fmt"
"os"
"path/filepath"
"github.com/BurntSushi/toml"
)
type Config struct {
Listen string `toml:"listen"`
Root string `toml:"root"`
Hidden bool `toml:"hidden"`
Footer string `toml:"footer"`
}
func loadConfig(path string) (*Config, error) {
b, err := os.ReadFile(path)
if err != nil {
return nil, err
}
cfg := &Config{}
if err := toml.Unmarshal(b, cfg); err != nil {
return nil, fmt.Errorf("%s: %w", path, err)
}
if cfg.Root == "" {
return nil, errors.New(`config: "root" is required`)
}
root, err := filepath.Abs(cfg.Root)
if err != nil {
return nil, err
}
if info, err := os.Stat(root); err != nil || !info.IsDir() {
return nil, fmt.Errorf("config: root %q is not a directory", root)
}
cfg.Root = root
if cfg.Listen == "" {
cfg.Listen = ":8080"
}
if cfg.Footer == "" {
cfg.Footer = "kaidan 1.0"
}
return cfg, nil
}

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# kaidan configuration
# host:port to bind. Point your subdomain / reverse proxy here.
listen = ":8080"
# directory served at /
root = "./files"
# include dotfiles in listings
hidden = true
# footer shown at the bottom of every page
footer = "kaidan 1.0"

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module kaidan
go 1.22
require github.com/BurntSushi/toml v1.4.0

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package main
import (
"flag"
"log"
"net/http"
"time"
)
func main() {
cfgPath := flag.String("config", "config.toml", "path to TOML config")
flag.Parse()
cfg, err := loadConfig(*cfgPath)
if err != nil {
log.Fatalf("majin: %v", err)
}
srv := &http.Server{
Addr: cfg.Listen,
Handler: newServer(cfg),
ReadHeaderTimeout: 10 * time.Second,
ReadTimeout: 60 * time.Second,
WriteTimeout: 10 * time.Minute,
IdleTimeout: 2 * time.Minute,
}
log.Printf("kaidan 1.0 serving %q at %s", cfg.Root, cfg.Listen)
log.Fatal(srv.ListenAndServe())
}

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package main
import (
"cmp"
_ "embed"
"fmt"
"html/template"
"mime"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"sort"
"strings"
"time"
)
//go:embed assets/index.html
var indexHTML string
//go:embed assets/about.html
var aboutHTML []byte
//go:embed assets/favicon.ico
var faviconICO []byte
type server struct {
root string // as configured, used for display paths
rootReal string // symlink-resolved root, used for containment checks
hidden bool
footer string
tpl *template.Template
}
func newServer(cfg *Config) *server {
rootReal, err := filepath.EvalSymlinks(cfg.Root)
if err != nil {
rootReal = cfg.Root
}
return &server{
root: cfg.Root,
rootReal: rootReal,
hidden: cfg.Hidden,
footer: cfg.Footer,
tpl: template.Must(template.New("index").Parse(indexHTML)),
}
}
type row struct {
Name string
URL string
IsDir bool
Size int64
ModTime time.Time
Type string
}
func (r row) SizeS() string { return humanSize(r.Size) }
func (r row) ModS() string { return r.ModTime.Format("2006-01-02 15:04") }
type headerCol struct {
Label string
URL string
Active bool
Desc bool
}
type crumb struct{ Name, URL string }
type listData struct {
Path string
Crumbs []crumb
Headers []headerCol
Rows []row
HasParent bool
Wget string
Footer string
}
var sortKeys = map[string]bool{"name": true, "size": true, "modified": true, "type": true}
func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet && r.Method != http.MethodHead {
w.Header().Set("Allow", "GET, HEAD")
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
upath := r.URL.Path
if !strings.HasPrefix(upath, "/") {
upath = "/" + upath
}
clean := path.Clean(upath)
switch clean {
case "/about":
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Write(aboutHTML)
return
case "/favicon.ico":
w.Header().Set("Content-Type", "image/x-icon")
w.Header().Set("Cache-Control", "max-age=604800")
w.Write(faviconICO)
return
}
fsPath := filepath.Join(s.rootReal, filepath.FromSlash(strings.TrimPrefix(clean, "/")))
realPath, err := filepath.EvalSymlinks(fsPath)
if err != nil {
http.NotFound(w, r)
return
}
if realPath != s.rootReal && !strings.HasPrefix(realPath, s.rootReal+string(os.PathSeparator)) {
http.NotFound(w, r) // symlink escaping the served root
return
}
info, err := os.Stat(realPath)
if err != nil {
http.NotFound(w, r)
return
}
if info.IsDir() && !strings.HasSuffix(upath, "/") {
localRedirect(w, r, path.Base(upath)+"/")
return
}
if !info.IsDir() {
s.serveFile(w, r, realPath, filepath.Base(clean), info)
return
}
s.serveListing(w, r, realPath, clean)
}
func localRedirect(w http.ResponseWriter, r *http.Request, newPath string) {
if q := r.URL.RawQuery; q != "" {
newPath += "?" + q
}
w.Header().Set("Location", newPath)
w.WriteHeader(http.StatusMovedPermanently)
}
func (s *server) serveFile(w http.ResponseWriter, r *http.Request, path, name string, info os.FileInfo) {
f, err := os.Open(path)
if err != nil {
http.Error(w, "cannot open file", http.StatusInternalServerError)
return
}
defer f.Close()
w.Header().Set("Content-Disposition",
mime.FormatMediaType("attachment", map[string]string{"filename": name}))
http.ServeContent(w, r, name, info.ModTime(), f)
}
func (s *server) serveListing(w http.ResponseWriter, r *http.Request, dirPath, urlPath string) {
entries, err := os.ReadDir(dirPath)
if err != nil {
http.Error(w, "cannot read directory", http.StatusInternalServerError)
return
}
sortKey := r.URL.Query().Get("sort")
if !sortKeys[sortKey] {
sortKey = "name"
}
desc := r.URL.Query().Get("dir") == "desc"
dirURL := urlPath
if !strings.HasSuffix(dirURL, "/") {
dirURL += "/"
}
rows := make([]row, 0, len(entries))
for _, e := range entries {
name := e.Name()
if !s.hidden && strings.HasPrefix(name, ".") {
continue
}
isDir := e.IsDir()
typ := "-"
if isDir {
typ = "dir"
} else if ext := strings.TrimPrefix(filepath.Ext(name), "."); ext != "" {
typ = strings.ToLower(ext)
}
var size int64
var mod time.Time
if info, err := e.Info(); err == nil {
mod = info.ModTime()
if !isDir {
size = info.Size()
}
}
rows = append(rows, row{
Name: name,
URL: dirURL + url.PathEscape(name),
IsDir: isDir,
Size: size,
ModTime: mod,
Type: typ,
})
}
sort.SliceStable(rows, func(i, j int) bool {
a, b := rows[i], rows[j]
if a.IsDir != b.IsDir {
return a.IsDir
}
var c int
switch sortKey {
case "size":
c = cmp.Compare(a.Size, b.Size)
case "modified":
c = a.ModTime.Compare(b.ModTime)
case "type":
if c = strings.Compare(a.Type, b.Type); c == 0 {
c = strings.Compare(strings.ToLower(a.Name), strings.ToLower(b.Name))
}
default:
c = strings.Compare(strings.ToLower(a.Name), strings.ToLower(b.Name))
}
if desc {
return c > 0
}
return c < 0
})
headers := []struct {
Label string
Key string
}{{"Name", "name"}, {"Type", "type"}, {"Size", "size"}, {"Modified", "modified"}}
cols := make([]headerCol, len(headers))
for i, h := range headers {
cols[i] = headerCol{
Label: h.Label,
Active: h.Key == sortKey,
Desc: h.Key == sortKey && desc,
}
d := "asc"
if h.Key == sortKey && !desc {
d = "desc"
}
cols[i].URL = dirURL + "?sort=" + h.Key + "&dir=" + d
}
crumbs := []crumb{{Name: "root", URL: "/"}}
cur := ""
for _, seg := range segments(urlPath) {
cur += "/" + seg
crumbs = append(crumbs, crumb{Name: seg, URL: cur + "/"})
}
s.tpl.Execute(w, listData{
Path: dirURL,
Crumbs: crumbs,
Headers: cols,
Rows: rows,
HasParent: urlPath != "/",
Wget: wgetCmd(r, dirURL),
Footer: s.footer,
})
}
func wgetCmd(r *http.Request, dirURL string) string {
cmd := "wget -r -np -nH"
if n := len(segments(dirURL)); n > 0 {
cmd += fmt.Sprintf(" --cut-dirs=%d", n)
}
return cmd + ` -R "index.html*" -e robots=off ` + shellQuote(baseURL(r)+dirURL)
}
// shellQuote quotes s so it is treated as a single literal argument by POSIX shells.
func shellQuote(s string) string {
return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
}
func baseURL(r *http.Request) string {
scheme := "http"
if r.TLS != nil || r.Header.Get("X-Forwarded-Proto") == "https" {
scheme = "https"
}
return scheme + "://" + r.Host
}
func segments(p string) []string {
p = strings.Trim(p, "/")
if p == "" {
return nil
}
return strings.Split(p, "/")
}
func humanSize(n int64) string {
const unit = 1024
if n < unit {
return fmt.Sprintf("%d B", n)
}
div, exp := int64(unit), 0
for m := n / unit; m >= unit; m /= unit {
div *= unit
exp++
}
return fmt.Sprintf("%.1f %ciB", float64(n)/float64(div), "KMGTPE"[exp])
}