Streamline local file handling, test Windows files

url/url.go

+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 /* package URL handles Helm-DM URLs
 
 Helm uses three kinds of URLs:
@@ -14,11 +30,16 @@ import (
 	"errors"
 	"fmt"
 	"net/url"
-	"path/filepath"
 	"regexp"
 	"strings"
 )
 
+// ErrLocal indicates that a local URL was used as a remote URL.
+var ErrLocal = errors.New("cannot use local URL as remote")
+
+// ErrRemote indicates that a remote URL was used as a local URL.
+var ErrRemote = errors.New("cannot use remote URL as local")
+
 const (
 	SchemeHTTP  = "http"
 	SchemeHTTPS = "https"
@@ -61,31 +82,23 @@ type URL struct {
 
 func Parse(path string) (*URL, error) {
 
-	// Check for absolute or relative path.
-	if path[0] == '.' || path[0] == '/' {
-		return &URL{
-			LocalRef: path,
-			isLocal:  true,
-			original: path,
-		}, nil
-	}
-
 	// TODO: Do we want to support file:///foo/bar.tgz?
-	if strings.HasPrefix(path, SchemeFile+":") {
-		path := strings.TrimPrefix(path, SchemeFile+":")
-		return &URL{
-			LocalRef: filepath.Clean(path),
-			isLocal:  true,
-			original: path,
-		}, nil
-	}
+	//if strings.HasPrefix(path, SchemeFile+":") {
+	//path := strings.TrimPrefix(path, SchemeFile+":")
+	//return &URL{
+	//LocalRef: filepath.Clean(path),
+	//isLocal:  true,
+	//original: path,
+	//}, nil
+	//}
 
 	u, err := url.Parse(path)
 	if err != nil {
 		return nil, err
 	}
-	// Short name
-	if u.Scheme == SchemeHelm {
+
+	switch u.Scheme {
+	case SchemeHelm:
 		parts := strings.SplitN(u.Opaque, "/", 3)
 		if len(parts) < 3 {
 			return nil, fmt.Errorf("both bucket and chart name are required in %s: %s", path, u.Path)
@@ -99,8 +112,8 @@ func Parse(path string) (*URL, error) {
 			Version:  u.Fragment,
 			original: path,
 		}, nil
-	}
 
+	case SchemeHTTP, SchemeHTTPS:
 		// Long name
 		parts := strings.SplitN(u.Path, "/", 3)
 		if len(parts) < 3 {
@@ -120,6 +133,23 @@ func Parse(path string) (*URL, error) {
 			Version:  version,
 			original: path,
 		}, nil
+	case SchemeFile:
+		return &URL{
+			LocalRef: u.Path,
+			isLocal:  true,
+			original: path,
+		}, nil
+	default:
+		// In this case...
+		// - if the path is relative or absolute, return it as-is.
+		// - if it's a URL of an unknown scheme, return it as is.
+		return &URL{
+			LocalRef: path,
+			isLocal:  true,
+			original: path,
+		}, nil
+
+	}
 }
 
 // IsLocal returns true if this is a local path.
@@ -134,9 +164,6 @@ func (u *URL) Local() (string, error) {
 	return u.LocalRef, nil
 }
 
-var ErrLocal = errors.New("cannot use local URL as remote")
-var ErrRemote = errors.New("cannot use remote URL as local")
-
 // Short returns a short form URL.
 //
 // This will return an error if the URL references a local chart.

url/url_test.go

+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 package url
 
 import (
@@ -129,6 +145,9 @@ func TestLocal(t *testing.T) {
 		"file:///foo/bar":            "/foo/bar",
 		"./foo/bar":                  "./foo/bar",
 		"/foo/bar":                   "/foo/bar",
+		"file://localhost/etc/fstab": "/etc/fstab",
+		// https://blogs.msdn.microsoft.com/ie/2006/12/06/file-uris-in-windows/
+		"file:///C:/WINDOWS/clock.avi": "/C:/WINDOWS/clock.avi",
 	}
 
 	for start, expect := range tests {