// Copyright (c) 2019,CAOHONGJU All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package utils

import (
	"path"
	"strings"
)

// CanonicalPath 获取合法的path
func CanonicalPath(p string) string {
	p = strings.ToLower(strings.TrimSpace(p))

	if p == "" {
		return "/"
	}

	if p[0] != '/' {
		p = "/" + p
	}

	np := path.Clean(p)
	// path.Clean removes trailing slash except for root;
	// put the trailing slash back if necessary.
	if p[len(p)-1] == '/' && np != "/" {
		// Fast path for common case of p being the string we want:
		if len(p) == len(np)+1 && strings.HasPrefix(p, np) {
			np = p
		} else {
			np += "/"
		}
	}

	return np
}