86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
package gemini
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import (
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"io"
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"io/fs"
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"mime"
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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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mime.AddExtensionType(".gmi", "text/gemini")
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mime.AddExtensionType(".gemini", "text/gemini")
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}
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// FileServer returns a handler that serves Gemini requests with the contents
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// of the provided file system.
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//
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// To use the operating system's file system implementation, use os.DirFS:
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//
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// gemini.FileServer(os.DirFS("/tmp"))
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func FileServer(fsys fs.FS) Handler {
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return fileServer{fsys}
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}
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type fileServer struct {
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fs.FS
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}
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func (fs fileServer) ServeGemini(w ResponseWriter, r *Request) {
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ServeFile(w, fs, r.URL.Path)
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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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//
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// If the provided file or directory name is a relative path, it is interpreted
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// relative to the current directory and may ascend to parent directories. If
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// the provided name is constructed from user input, it should be sanitized
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// before calling ServeFile.
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func ServeFile(w ResponseWriter, fsys fs.FS, name string) {
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f, err := openFile(fsys, 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(fsys fs.FS, name string) (fs.File, error) {
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f, err := fsys.Open(name)
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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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if stat.IsDir() {
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// Try opening index.gmi
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f, err := fsys.Open(path.Join(name, "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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}
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return nil, fs.ErrNotExist
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}
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