From 581d3e6da562e06ef27cb99f86dc0249d17d0a53 Mon Sep 17 00:00:00 2001 From: Nixietab <75538775+nixietab@users.noreply.github.com> Date: Sat, 22 Aug 2026 08:22:53 -0300 Subject: [PATCH] first commit --- .gitignore | 2 + LICENSE | 338 +++++++++++++++++++++++++++++++++++++++++++++ README.md | 22 +++ assets/about.html | 64 +++++++++ assets/favicon.ico | Bin 0 -> 1150 bytes assets/index.html | 166 ++++++++++++++++++++++ config.go | 46 ++++++ config.toml | 13 ++ go.mod | 5 + main.go | 29 ++++ server.go | 302 ++++++++++++++++++++++++++++++++++++++++ 11 files changed, 987 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 README.md create mode 100644 assets/about.html create mode 100644 assets/favicon.ico create mode 100644 assets/index.html create mode 100644 config.go create mode 100644 config.toml create mode 100644 go.mod create mode 100644 main.go create mode 100644 server.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..7824e96 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +kaidan +go.sum diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..9efa6fb --- /dev/null +++ b/LICENSE @@ -0,0 +1,338 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + + 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 +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +this service if you wish), that you receive source code or can get it +if you want it, that you can change the software or use pieces of it +in new free programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. You must make sure that they, too, receive or can get the +source code. And you must show them these terms so they know their +rights. + + We protect your rights with two steps: (1) copyright the software, and +(2) offer you this license which gives you legal permission to copy, +distribute and/or modify the software. + + Also, for each author's protection and ours, we want to make certain +that everyone understands that there is no warranty for this free +software. If the software is modified by someone else and passed on, we +want its recipients to know that what they have is not the original, so +that any problems introduced by others will not reflect on the original +authors' reputations. + + Finally, any free program is threatened constantly by software +patents. We wish to avoid the danger that redistributors of a free +program will individually obtain patent licenses, in effect making the +program proprietary. To prevent this, we have made it clear that any +patent must be licensed for everyone's free use or not licensed at all. + + The precise terms and conditions for copying, distribution and +modification follow. + + 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 +under the terms of this General Public License. The "Program", below, +refers to any such program or work, and a "work based on the Program" +means either the Program or any derivative work under copyright law: +that is to say, a work containing the Program or a portion of it, +either verbatim or with modifications and/or translated into another +language. (Hereinafter, translation is included without limitation in +the term "modification".) Each licensee is addressed as "you". + +Activities other than copying, distribution and modification are not +covered by this License; they are outside its scope. The act of +running the Program is not restricted, and the output from the Program +is covered only if its contents constitute a work based on the +Program (independent of having been made by running the Program). +Whether that is true depends on what the Program does. + + 1. You may copy and distribute verbatim copies of the Program's +source code as you receive it, in any medium, provided that you +conspicuously and appropriately publish on each copy an appropriate +copyright notice and disclaimer of warranty; keep intact all the +notices that refer to this License and to the absence of any warranty; +and give any other recipients of the Program a copy of this License +along with the Program. + +You may charge a fee for the physical act of transferring a copy, and +you may at your option offer warranty protection in exchange for a fee. + + 2. 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It is safest +to attach them to the start of each source file to most effectively +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. + + + Copyright (C) + + 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 . + +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. + + , 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. diff --git a/README.md b/README.md new file mode 100644 index 0000000..e999cee --- /dev/null +++ b/README.md @@ -0,0 +1,22 @@ +# 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 \ No newline at end of file diff --git a/assets/about.html b/assets/about.html new file mode 100644 index 0000000..95ed6a1 --- /dev/null +++ b/assets/about.html @@ -0,0 +1,64 @@ + + + + + +about · kaidan + + + + +

kaidan

+

as "stairs" in japanese.

+

a minimal, fast file index server. serves a directory tree over http. +every listing includes a ready-to-run wget command that +mirrors that directory recursively into your current folder.

+

licensed under the GPL 2.0. +source available here.

+

back to index

+
kaidan 1.0
+ + diff --git a/assets/favicon.ico b/assets/favicon.ico new file mode 100644 index 0000000000000000000000000000000000000000..6ef84af4ad9362c622ec9c052a76303156a9e645 GIT binary patch literal 1150 zcmZQzU<5(|0R|wcz>vYhz#zuJz@P!dKp~(AL>x$g + + + + +{{.Path}} kaidan + + + + + +
+ +{{range .Headers}}{{end}} + +{{if .HasParent}}{{end}} +{{range .Rows}} + + + + + + +{{else}}{{end}} + +
{{.Label}}{{if .Active}}{{if .Desc}} ▼{{else}} ▲{{end}}{{end}}
../-
{{.Name}}{{.Type}}{{if .IsDir}}-{{else}}{{.SizeS}}{{end}}{{.ModS}}
empty directory
+
+
Download this directory
+
{{.Wget}}
+ + + diff --git a/config.go b/config.go new file mode 100644 index 0000000..8bd703c --- /dev/null +++ b/config.go @@ -0,0 +1,46 @@ +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 +} diff --git a/config.toml b/config.toml new file mode 100644 index 0000000..277bcda --- /dev/null +++ b/config.toml @@ -0,0 +1,13 @@ +# 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" diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..73b00f9 --- /dev/null +++ b/go.mod @@ -0,0 +1,5 @@ +module kaidan + +go 1.22 + +require github.com/BurntSushi/toml v1.4.0 diff --git a/main.go b/main.go new file mode 100644 index 0000000..1b07af9 --- /dev/null +++ b/main.go @@ -0,0 +1,29 @@ +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()) +} diff --git a/server.go b/server.go new file mode 100644 index 0000000..b4eabf2 --- /dev/null +++ b/server.go @@ -0,0 +1,302 @@ +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]) +}