go-latestver/frontend.go

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package main
import (
"net/http"
"os"
"path"
"path/filepath"
"github.com/pkg/errors"
)
func handleSinglePage(w http.ResponseWriter, r *http.Request) {
// get the absolute path to prevent directory traversal
urlPath, err := filepath.Abs(r.URL.Path)
if err != nil {
// if we failed to get the absolute path respond with a 400 bad request
// and stop
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
for _, path := range []string{
filepath.Join("frontend", path.Base(urlPath)),
filepath.Join("frontend", "index.html"),
} {
f, err := frontendFS.Open(path)
switch {
case err == nil:
// file is opened, serve it
defer f.Close()
stat, err := f.Stat()
if err != nil {
http.Error(w, errors.Wrap(err, "stating opened file").Error(), http.StatusInternalServerError)
return
}
if stat.IsDir() {
continue
}
http.ServeContent(w, r, stat.Name(), stat.ModTime(), f)
return
case os.IsNotExist(err):
// file does not exist, try next
continue
default:
// if we got an error (that wasn't that the file doesn't exist) stating the
// file, return a 500 internal server error and stop
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
// No path could be opened
http.NotFound(w, r)
}