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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"
"net/url"
"path/filepath"
"strings"
)
// TODO(golang.org/issue/32456): If accepted, move these functions into the
// net/url package.
var errNotAbsolute = errors.New("path is not absolute")
func urlToFilePath(u *url.URL) (string, error) {
if u.Scheme != "file" {
return "", errors.New("non-file URL")
}
checkAbs := func(path string) (string, error) {
if !filepath.IsAbs(path) {
return "", errNotAbsolute
}
return path, nil
}
if u.Path == "" {
if u.Host != "" || u.Opaque == "" {
return "", errors.New("file URL missing path")
}
return checkAbs(filepath.FromSlash(u.Opaque))
}
path, err := convertFileURLPath(u.Host, u.Path)
if err != nil {
return path, err
}
return checkAbs(path)
}
func urlFromFilePath(path string) (*url.URL, error) {
if !filepath.IsAbs(path) {
return nil, errNotAbsolute
}
// If path has a Windows volume name, convert the volume to a host and prefix
// per https://blogs.msdn.microsoft.com/ie/2006/12/06/file-uris-in-windows/.
if vol := filepath.VolumeName(path); vol != "" {
if strings.HasPrefix(vol, `\\`) {
path = filepath.ToSlash(path[2:])
i := strings.IndexByte(path, '/')
if i < 0 {
// A degenerate case.
// \\host.example.com (without a share name)
// becomes
// file://host.example.com/
return &url.URL{
Scheme: "file",
Host: path,
Path: "/",
}, nil
}
// \\host.example.com\Share\path\to\file
// becomes
// file://host.example.com/Share/path/to/file
return &url.URL{
Scheme: "file",
Host: path[:i],
Path: filepath.ToSlash(path[i:]),
}, nil
}
// C:\path\to\file
// becomes
// file:///C:/path/to/file
return &url.URL{
Scheme: "file",
Path: "/" + filepath.ToSlash(path),
}, nil
}
// /path/to/file
// becomes
// file:///path/to/file
return &url.URL{
Scheme: "file",
Path: filepath.ToSlash(path),
}, nil
}
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