112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
package gemini
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import (
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"fmt"
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"io"
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"mime"
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"os"
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"path"
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)
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func init() {
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// Add Gemini mime types
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if err := mime.AddExtensionType(".gmi", "text/gemini"); err != nil {
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panic(fmt.Errorf("failed to register .gmi extension mimetype: %w", err))
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}
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if err := mime.AddExtensionType(".gemini", "text/gemini"); err != nil {
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panic(fmt.Errorf("failed to register .gemini extension mimetype: %w", err))
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}
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}
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// FileServer takes a filesystem and returns a Responder which uses that filesystem.
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// The returned Responder sanitizes paths before handling them.
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func FileServer(fsys FS) Responder {
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return fsHandler{fsys}
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}
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type fsHandler struct {
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FS
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}
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func (fsh fsHandler) Respond(w *ResponseWriter, r *Request) {
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p := path.Clean(r.URL.Path)
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f, err := fsh.Open(p)
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if err != nil {
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w.Status(StatusNotFound)
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return
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}
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// Detect mimetype
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ext := path.Ext(p)
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mimetype := mime.TypeByExtension(ext)
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w.Meta(mimetype)
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// Copy file to response writer
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_, _ = io.Copy(w, f)
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}
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// TODO: replace with io/fs.FS when available
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type FS interface {
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Open(name string) (File, error)
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}
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// TODO: replace with io/fs.File when available
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type File interface {
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Stat() (os.FileInfo, error)
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Read([]byte) (int, error)
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Close() error
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}
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// Dir implements FS using the native filesystem restricted to a specific directory.
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type Dir string
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// Open tries to open the file with the given name.
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// If the file is a directory, it tries to open the index file in that directory.
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func (d Dir) Open(name string) (File, error) {
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p := path.Join(string(d), name)
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return openFile(p)
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}
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// ServeFile responds to the request with the contents of the named file
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// or directory.
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// TODO: Use io/fs.FS when available.
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func ServeFile(w *ResponseWriter, fs FS, name string) {
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f, err := fs.Open(name)
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if err != nil {
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w.Status(StatusNotFound)
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return
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}
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// Detect mimetype
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ext := path.Ext(name)
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mimetype := mime.TypeByExtension(ext)
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w.Meta(mimetype)
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// Copy file to response writer
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_, _ = io.Copy(w, f)
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}
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func openFile(p string) (File, error) {
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f, err := os.OpenFile(p, os.O_RDONLY, 0644)
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if err != nil {
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return nil, err
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}
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if stat, err := f.Stat(); err == nil {
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if stat.IsDir() {
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f, err := os.Open(path.Join(p, "index.gmi"))
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if err != nil {
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return nil, err
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}
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stat, err := f.Stat()
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if err != nil {
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return nil, err
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}
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if stat.Mode().IsRegular() {
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return f, nil
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}
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return nil, os.ErrNotExist
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} else if !stat.Mode().IsRegular() {
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return nil, os.ErrNotExist
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}
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}
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return f, nil
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}
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