126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
// Package fileserver implements a gemini handler function to serve files with optional auto
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// indexing for directory listings.
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package fileserver
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"mime"
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"os"
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"path"
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"path/filepath"
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"strings"
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"gitrepo.ru/neonxp/gmifs/gemini"
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)
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var (
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ErrDirWithoutIndexFile = errors.New("path without index.gmi not allowed")
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ErrUnsupportedFileType = errors.New("disabled/unsupported file type")
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)
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func Serve(root string, autoindex bool) func(w gemini.ResponseWriter, r *gemini.Request) {
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return func(w gemini.ResponseWriter, 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 errors.Is(err, ErrDirWithoutIndexFile) && autoindex {
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body, mimeType, err := listDirectory(fullpath, r.URL.Path)
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if err != nil {
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w.WriteHeader(gemini.StatusNotFound, err.Error())
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return
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}
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w.WriteHeader(gemini.StatusSuccess, mimeType)
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w.Write(body)
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return
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}
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w.WriteHeader(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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w.WriteHeader(gemini.StatusNotFound, err.Error())
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return
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}
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w.WriteHeader(gemini.StatusSuccess, mimeType)
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w.Write(body)
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}
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}
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func fullPath(root, requestPath string) (string, error) {
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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, ErrDirWithoutIndexFile
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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, "", ErrUnsupportedFileType
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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, "", fmt.Errorf("list directory: %w", err)
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}
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var out []byte
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idx := strings.TrimRight(relpath, "/")
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parent := filepath.Dir(idx)
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if relpath != "/" {
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out = append(out, []byte(fmt.Sprintf("Index of %s/\n\n", idx))...)
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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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