Adding upstream version 1.20.14.upstream/1.20.14upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/src/cmd/go/internal/web/url.go b/src/cmd/go/internal/web/url.go
new file mode 100644
index 0000000..146c51f
--- /dev/null
+++ b/src/cmd/go/internal/web/url.go
@@ -0,0 +1,95 @@
+// 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
+}