Source file src/pkg/cmd/go/internal/web/url.go

     1	// Copyright 2019 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package web
     6	
     7	import (
     8		"errors"
     9		"net/url"
    10		"path/filepath"
    11		"strings"
    12	)
    13	
    14	// TODO(golang.org/issue/32456): If accepted, move these functions into the
    15	// net/url package.
    16	
    17	var errNotAbsolute = errors.New("path is not absolute")
    18	
    19	func urlToFilePath(u *url.URL) (string, error) {
    20		if u.Scheme != "file" {
    21			return "", errors.New("non-file URL")
    22		}
    23	
    24		checkAbs := func(path string) (string, error) {
    25			if !filepath.IsAbs(path) {
    26				return "", errNotAbsolute
    27			}
    28			return path, nil
    29		}
    30	
    31		if u.Path == "" {
    32			if u.Host != "" || u.Opaque == "" {
    33				return "", errors.New("file URL missing path")
    34			}
    35			return checkAbs(filepath.FromSlash(u.Opaque))
    36		}
    37	
    38		path, err := convertFileURLPath(u.Host, u.Path)
    39		if err != nil {
    40			return path, err
    41		}
    42		return checkAbs(path)
    43	}
    44	
    45	func urlFromFilePath(path string) (*url.URL, error) {
    46		if !filepath.IsAbs(path) {
    47			return nil, errNotAbsolute
    48		}
    49	
    50		// If path has a Windows volume name, convert the volume to a host and prefix
    51		// per https://blogs.msdn.microsoft.com/ie/2006/12/06/file-uris-in-windows/.
    52		if vol := filepath.VolumeName(path); vol != "" {
    53			if strings.HasPrefix(vol, `\\`) {
    54				path = filepath.ToSlash(path[2:])
    55				i := strings.IndexByte(path, '/')
    56	
    57				if i < 0 {
    58					// A degenerate case.
    59					// \\host.example.com (without a share name)
    60					// becomes
    61					// file://host.example.com/
    62					return &url.URL{
    63						Scheme: "file",
    64						Host:   path,
    65						Path:   "/",
    66					}, nil
    67				}
    68	
    69				// \\host.example.com\Share\path\to\file
    70				// becomes
    71				// file://host.example.com/Share/path/to/file
    72				return &url.URL{
    73					Scheme: "file",
    74					Host:   path[:i],
    75					Path:   filepath.ToSlash(path[i:]),
    76				}, nil
    77			}
    78	
    79			// C:\path\to\file
    80			// becomes
    81			// file:///C:/path/to/file
    82			return &url.URL{
    83				Scheme: "file",
    84				Path:   "/" + filepath.ToSlash(path),
    85			}, nil
    86		}
    87	
    88		// /path/to/file
    89		// becomes
    90		// file:///path/to/file
    91		return &url.URL{
    92			Scheme: "file",
    93			Path:   filepath.ToSlash(path),
    94		}, nil
    95	}
    96	

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