2 files changed, 81 insertions, 0 deletions
diff --git a/modules/util/path.go b/modules/util/path.go
index aa3d009899..2ac8f4d80a 100644
--- a/modules/util/path.go
+++ b/modules/util/path.go
@@ -6,9 +6,12 @@ package util
 
 import (
 	"errors"
+	"net/url"
 	"os"
 	"path"
 	"path/filepath"
+	"regexp"
+	"runtime"
 	"strings"
 )
 
@@ -150,3 +153,23 @@ func StatDir(rootPath string, includeDir ...bool) ([]string, error) {
 	}
 	return statDir(rootPath, "", isIncludeDir, false, false)
 }
+
+// FileURLToPath extracts the path informations from a file://... url.
+func FileURLToPath(u *url.URL) (string, error) {
+	if u.Scheme != "file" {
+		return "", errors.New("URL scheme is not 'file': " + u.String())
+	}
+
+	path := u.Path
+
+	if runtime.GOOS != "windows" {
+		return path, nil
+	}
+
+	// If it looks like there's a Windows drive letter at the beginning, strip off the leading slash.
+	re := regexp.MustCompile("/[A-Za-z]:/")
+	if re.MatchString(path) {
+		return path[1:], nil
+	}
+	return path, nil
+}
diff --git a/modules/util/path_test.go b/modules/util/path_test.go
new file mode 100644
index 0000000000..41104f79fc
--- /dev/null
+++ b/modules/util/path_test.go
@@ -0,0 +1,58 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package util
+
+import (
+	"net/url"
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFileURLToPath(t *testing.T) {
+	var cases = []struct {
+		url      string
+		expected string
+		haserror bool
+		windows  bool
+	}{
+		// case 0
+		{
+			url:      "",
+			haserror: true,
+		},
+		// case 1
+		{
+			url:      "http://test.io",
+			haserror: true,
+		},
+		// case 2
+		{
+			url:      "file:///path",
+			expected: "/path",
+		},
+		// case 3
+		{
+			url:      "file:///C:/path",
+			expected: "C:/path",
+			windows:  true,
+		},
+	}
+
+	for n, c := range cases {
+		if c.windows && runtime.GOOS != "windows" {
+			continue
+		}
+		u, _ := url.Parse(c.url)
+		p, err := FileURLToPath(u)
+		if c.haserror {
+			assert.Error(t, err, "case %d: should return error", n)
+		} else {
+			assert.NoError(t, err, "case %d: should not return error", n)
+			assert.Equal(t, c.expected, p, "case %d: should be equal", n)
+		}
+	}
+}