2021-07-06 19:48:02 +03:00
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package main
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import (
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"context"
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"crypto/tls"
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"errors"
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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"mime"
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"os"
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"os/signal"
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"path"
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"path/filepath"
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"time"
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"github.com/n0x1m/gmifs/gemini"
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"github.com/n0x1m/gmifs/middleware"
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)
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const (
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defaultAddress = ":1965"
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defaultMaxConns = 256
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defaultTimeout = 10
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defaultRootPath = "/var/www/htdocs/gemini"
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defaultHost = ""
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defaultCertPath = ""
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defaultKeyPath = ""
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shutdownTimeout = 10 * time.Second
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)
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2021-07-08 15:04:33 +03:00
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var ErrDirWithoutIndex = errors.New("path is directory without index.gmi")
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func main() {
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var addr, root, crt, key, host, logs string
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var maxconns, timeout int
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var debug bool
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flag.StringVar(&addr, "addr", defaultAddress, "address to listen on. E.g. 127.0.0.1:1965")
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flag.IntVar(&maxconns, "max-conns", defaultMaxConns, "maximum number of concurrently open connections")
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flag.IntVar(&timeout, "timeout", defaultTimeout, "connection timeout in seconds")
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flag.StringVar(&root, "root", defaultRootPath, "server root directory to serve from")
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flag.StringVar(&host, "host", defaultHost, "hostname / x509 Common Name when using temporary self-signed certs")
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flag.StringVar(&crt, "cert", defaultCertPath, "TLS chain of one or more certificates")
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flag.StringVar(&key, "key", defaultKeyPath, "TLS private key")
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flag.StringVar(&logs, "logs", "", "directory for file based logging")
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flag.BoolVar(&debug, "debug", false, "enable verbose logging of the gemini server")
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flag.Parse()
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// TODO: rotate on SIGHUP
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mlogger := log.New(os.Stdout, "", log.LUTC|log.Ldate|log.Ltime)
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if logs != "" {
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logpath := filepath.Join(logs, "access.log")
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accessLog, err := os.OpenFile(logpath, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
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if err != nil {
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log.Fatal(err)
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}
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defer accessLog.Close()
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mlogger.SetOutput(accessLog)
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}
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var dlogger *log.Logger
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if debug {
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dlogger = log.New(os.Stdout, "", log.LUTC|log.Ldate|log.Ltime)
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if logs != "" {
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logpath := filepath.Join(logs, "debug.log")
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debugLog, err := os.OpenFile(logpath, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
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if err != nil {
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log.Fatal(err)
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}
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defer debugLog.Close()
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dlogger.SetOutput(debugLog)
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}
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}
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var err error
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var cert tls.Certificate
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if crt != "" && key != "" {
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log.Println("loading certificate from", crt)
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cert, err = tls.LoadX509KeyPair(crt, key)
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if err != nil {
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log.Fatalf("server: loadkeys: %s", err)
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}
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} else if host != "" {
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log.Println("generating self-signed temporary certificate")
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cert, err = gemini.GenX509KeyPair(host)
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if err != nil {
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log.Fatalf("server: loadkeys: %s", err)
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}
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}
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if host == "" {
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fmt.Fprintf(os.Stderr, "a keypair with cert and key or at least a common name (hostname) is required for sni\n")
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fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
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flag.PrintDefaults()
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os.Exit(1)
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}
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2021-07-07 20:19:56 +03:00
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mux := gemini.NewMux()
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mux.Use(middleware.Logger(mlogger))
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mux.Handle(gemini.HandlerFunc(fileserver(root, true)))
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server := &gemini.Server{
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Addr: addr,
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Hostname: host,
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TLSConfig: gemini.TLSConfig(host, cert),
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Handler: mux,
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MaxOpenConns: maxconns,
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ReadTimeout: time.Duration(timeout) * time.Second,
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Logger: dlogger,
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}
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confirm := make(chan struct{}, 1)
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go func() {
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if err := server.ListenAndServe(); err != nil && !errors.Is(err, gemini.ErrServerClosed) {
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log.Fatalf("ListenAndServe terminated unexpectedly: %v", err)
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}
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close(confirm)
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}()
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stop := make(chan os.Signal, 1)
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signal.Notify(stop, os.Interrupt)
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<-stop
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ctx, cancel := context.WithTimeout(context.Background(), shutdownTimeout)
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if err := server.Shutdown(ctx); err != nil {
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cancel()
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log.Fatal("ListenAndServe shutdown")
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}
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<-confirm
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cancel()
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}
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func fileserver(root string, dirlisting bool) func(w io.Writer, r *gemini.Request) {
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return func(w io.Writer, r *gemini.Request) {
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fullpath, err := fullPath(root, r.URL.Path)
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if err != nil {
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if err == ErrDirWithoutIndex && dirlisting {
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body, mimeType, err := listDirectory(fullpath, r.URL.Path)
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if err != nil {
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gemini.WriteHeader(w, gemini.StatusNotFound, err.Error())
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return
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}
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gemini.WriteHeader(w, gemini.StatusSuccess, mimeType)
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gemini.Write(w, body)
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return
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}
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gemini.WriteHeader(w, gemini.StatusNotFound, err.Error())
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return
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}
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body, mimeType, err := readFile(fullpath)
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if err != nil {
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gemini.WriteHeader(w, gemini.StatusNotFound, err.Error())
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return
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}
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gemini.WriteHeader(w, gemini.StatusSuccess, mimeType)
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gemini.Write(w, body)
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}
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}
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func fullPath(root, requestPath string) (string, error) {
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if requestPath == "/" || requestPath == "." {
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//return path.Join(root, gemini.IndexFile), nil
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}
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fullpath := path.Join(root, requestPath)
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pathInfo, err := os.Stat(fullpath)
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if err != nil {
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return "", fmt.Errorf("path: %w", err)
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}
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if pathInfo.IsDir() {
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subDirIndex := path.Join(fullpath, gemini.IndexFile)
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if _, err := os.Stat(subDirIndex); os.IsNotExist(err) {
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return fullpath, ErrDirWithoutIndex
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}
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fullpath = subDirIndex
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}
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return fullpath, nil
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}
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func readFile(filepath string) ([]byte, string, error) {
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mimeType := getMimeType(filepath)
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if mimeType == "" {
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return nil, "", errors.New("unsupported")
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}
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file, err := os.Open(filepath)
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if err != nil {
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return nil, "", fmt.Errorf("file: %w", err)
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}
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defer file.Close()
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data, err := ioutil.ReadAll(file)
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if err != nil {
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return nil, "", fmt.Errorf("read: %w", err)
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}
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return data, mimeType, nil
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}
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func getMimeType(fullpath string) string {
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if ext := path.Ext(fullpath); ext != ".gmi" {
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return mime.TypeByExtension(ext)
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}
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return gemini.MimeType
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}
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func listDirectory(fullpath, relpath string) ([]byte, string, error) {
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files, err := ioutil.ReadDir(fullpath)
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if err != nil {
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return nil, "", err
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}
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var out []byte
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parent := filepath.Dir(relpath)
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if relpath != "/" {
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out = append(out, []byte(fmt.Sprintf("Index of %s/\n\n", relpath))...)
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out = append(out, []byte(fmt.Sprintf("=> %s ..\n", parent))...)
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} else {
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out = append(out, []byte(fmt.Sprintf("Index of %s\n\n", relpath))...)
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}
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for _, f := range files {
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if relpath == "/" {
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out = append(out, []byte(fmt.Sprintf("=> %s\n", f.Name()))...)
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} else {
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out = append(out, []byte(fmt.Sprintf("=> %s/%s %s\n", relpath, f.Name(), f.Name()))...)
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}
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}
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return out, gemini.MimeType, nil
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}
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