118 lines
2.2 KiB
Go
118 lines
2.2 KiB
Go
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package asarfs
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import (
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"io"
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"mime"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"layeh.com/asar"
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)
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// ASARfs serves the contents of an asar archive as an HTTP handler.
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type ASARfs struct {
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fin *os.File
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ar *asar.Entry
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notFound http.Handler
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}
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// Close closes the underlying file used for the asar archive.
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func (a *ASARfs) Close() error {
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return a.fin.Close()
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}
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// Open satisfies the http.FileSystem interface for ASARfs.
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func (a *ASARfs) Open(name string) (http.File, error) {
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if name == "/" {
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name = "/index.html"
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}
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e := a.ar.Find(strings.Split(name, "/")[1:]...)
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if e == nil {
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return nil, os.ErrNotExist
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}
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f := &file{
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Entry: e,
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r: e.Open(),
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}
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return f, nil
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}
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// ServeHTTP satisfies the http.Handler interface for ASARfs.
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func (a *ASARfs) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if r.RequestURI == "/" {
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r.RequestURI = "/index.html"
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}
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f := a.ar.Find(strings.Split(r.RequestURI, "/")[1:]...)
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if f == nil {
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a.notFound.ServeHTTP(w, r)
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return
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}
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ext := filepath.Ext(f.Name)
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mimeType := mime.TypeByExtension(ext)
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w.Header().Add("Content-Type", mimeType)
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f.WriteTo(w)
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}
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// New creates a new ASARfs pointer based on the filepath to the archive and
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// a HTTP handler to hit when a file is not found.
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func New(archivePath string, notFound http.Handler) (*ASARfs, error) {
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fin, err := os.Open(archivePath)
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if err != nil {
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return nil, err
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}
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root, err := asar.Decode(fin)
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if err != nil {
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return nil, err
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}
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a := &ASARfs{
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fin: fin,
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ar: root,
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notFound: notFound,
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}
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return a, nil
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}
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// file is an internal shim that mimics http.File for an asar entry.
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type file struct {
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*asar.Entry
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r io.ReadSeeker
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}
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func (f *file) Close() error {
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f.r = nil
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return nil
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}
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func (f *file) Read(buf []byte) (n int, err error) {
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return f.r.Read(buf)
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}
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func (f *file) Seek(offset int64, whence int) (int64, error) {
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return f.r.Seek(offset, whence)
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}
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func (f *file) Readdir(count int) ([]os.FileInfo, error) {
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result := []os.FileInfo{}
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for _, e := range f.Entry.Children {
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result = append(result, e.FileInfo())
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}
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return result, nil
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}
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func (f *file) Stat() (os.FileInfo, error) {
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return f.Entry.FileInfo(), nil
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}
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