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package gemini
import (
"io"
"io/fs"
"mime"
"path"
)
func init() {
// Add Gemini mime types
mime.AddExtensionType(".gmi", "text/gemini")
mime.AddExtensionType(".gemini", "text/gemini")
}
// FileServer returns a handler that serves Gemini requests with the contents
// of the provided file system.
//
// To use the operating system's file system implementation, use os.DirFS:
//
// gemini.FileServer(os.DirFS("/tmp"))
func FileServer(fsys fs.FS) Handler {
return fileServer{fsys}
}
type fileServer struct {
fs.FS
}
func (fs fileServer) ServeGemini(w ResponseWriter, r *Request) {
ServeFile(w, fs, r.URL.Path)
}
// ServeFile responds to the request with the contents of the named file
// or directory.
//
// If the provided file or directory name is a relative path, it is interpreted
// relative to the current directory and may ascend to parent directories. If
// the provided name is constructed from user input, it should be sanitized
// before calling ServeFile.
func ServeFile(w ResponseWriter, fsys fs.FS, name string) {
f, err := openFile(fsys, name)
if err != nil {
w.Status(StatusNotFound)
return
}
// Detect mimetype
ext := path.Ext(name)
mimetype := mime.TypeByExtension(ext)
w.Meta(mimetype)
// Copy file to response writer
_, _ = io.Copy(w, f)
}
func openFile(fsys fs.FS, name string) (fs.File, error) {
if name == "/" {
name = "."
} else {
name = strings.TrimPrefix(name, "/")
}
f, err := fsys.Open(name)
if err != nil {
return nil, err
}
stat, err := f.Stat()
if err != nil {
return nil, err
}
if stat.Mode().IsRegular() {
return f, nil
}
if stat.IsDir() {
// Try opening index.gmi
f, err := fsys.Open(path.Join(name, "index.gmi"))
if err != nil {
return nil, err
}
stat, err := f.Stat()
if err != nil {
return nil, err
}
if stat.Mode().IsRegular() {
return f, nil
}
}
return nil, fs.ErrNotExist
}
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