mirror of
https://github.com/Luzifer/go_helpers.git
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42 lines
1,018 B
Go
42 lines
1,018 B
Go
package http
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import (
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"net/http"
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"os"
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"github.com/pkg/errors"
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)
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type (
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// NoListFS wraps an http.FileSystem and ensures no directory
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// listings are printed out in order not to expose the contents
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// of the directory in a listing.
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NoListFS struct{ Next http.FileSystem }
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)
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var _ http.FileSystem = NoListFS{}
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// Open wraps the Open of the inner http.FileSystem and returns an
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// os.ErrNotExist in case a directory should be opened. This will
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// result in a HTTP 404 when trying to open a directory causing the
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// contents to be conceiled in an effective manner (zero exposure
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// of known paths)
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func (n NoListFS) Open(name string) (http.File, error) {
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f, err := n.Next.Open(name)
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if err != nil {
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return f, errors.Wrap(err, "opening file from inner fs")
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}
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info, err := f.Stat()
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if err != nil {
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f.Close()
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return nil, errors.Wrap(err, "getting stat from opened file")
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}
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if info.IsDir() {
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f.Close()
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return nil, errors.Wrap(os.ErrNotExist, "refusing to open a directory")
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}
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return f, nil
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}
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