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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package web
import (
"errors"
"path/filepath"
"strings"
)
func convertFileURLPath(host, path string) (string, error) {
if len(path) == 0 || path[0] != '/' {
return "", errNotAbsolute
}
path = filepath.FromSlash(path)
// We interpret Windows file URLs per the description in
// https://blogs.msdn.microsoft.com/ie/2006/12/06/file-uris-in-windows/.
// The host part of a file URL (if any) is the UNC volume name,
// but RFC 8089 reserves the authority "localhost" for the local machine.
if host != "" && host != "localhost" {
// A common "legacy" format omits the leading slash before a drive letter,
// encoding the drive letter as the host instead of part of the path.
// (See https://blogs.msdn.microsoft.com/freeassociations/2005/05/19/the-bizarre-and-unhappy-story-of-file-urls/.)
// We do not support that format, but we should at least emit a more
// helpful error message for it.
if filepath.VolumeName(host) != "" {
return "", errors.New("file URL encodes volume in host field: too few slashes?")
}
return `\\` + host + path, nil
}
// If host is empty, path must contain an initial slash followed by a
// drive letter and path. Remove the slash and verify that the path is valid.
if vol := filepath.VolumeName(path[1:]); vol == "" || strings.HasPrefix(vol, `\\`) {
return "", errors.New("file URL missing drive letter")
}
return path[1:], nil
}
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