ref: 08e4f9ff9cc448d5fea9b8a62a23aed8aad0d047
dir: /helpers/url.go/
// Copyright 2015 The Hugo 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 helpers
import (
"fmt"
"net/url"
"path"
"path/filepath"
"strings"
"github.com/PuerkitoBio/purell"
)
type pathBridge struct {
}
func (pathBridge) Base(in string) string {
return path.Base(in)
}
func (pathBridge) Clean(in string) string {
return path.Clean(in)
}
func (pathBridge) Dir(in string) string {
return path.Dir(in)
}
func (pathBridge) Ext(in string) string {
return path.Ext(in)
}
func (pathBridge) Join(elem ...string) string {
return path.Join(elem...)
}
func (pathBridge) Separator() string {
return "/"
}
var pb pathBridge
func sanitizeURLWithFlags(in string, f purell.NormalizationFlags) string {
s, err := purell.NormalizeURLString(in, f)
if err != nil {
return in
}
// Temporary workaround for the bug fix and resulting
// behavioral change in purell.NormalizeURLString():
// a leading '/' was inadvertently added to relative links,
// but no longer, see #878.
//
// I think the real solution is to allow Hugo to
// make relative URL with relative path,
// e.g. "../../post/hello-again/", as wished by users
// in issues #157, #622, etc., without forcing
// relative URLs to begin with '/'.
// Once the fixes are in, let's remove this kludge
// and restore SanitizeURL() to the way it was.
// -- @anthonyfok, 2015-02-16
//
// Begin temporary kludge
u, err := url.Parse(s)
if err != nil {
panic(err)
}
if len(u.Path) > 0 && !strings.HasPrefix(u.Path, "/") {
u.Path = "/" + u.Path
}
return u.String()
// End temporary kludge
//return s
}
// SanitizeURL sanitizes the input URL string.
func SanitizeURL(in string) string {
return sanitizeURLWithFlags(in, purell.FlagsSafe|purell.FlagRemoveTrailingSlash|purell.FlagRemoveDotSegments|purell.FlagRemoveDuplicateSlashes|purell.FlagRemoveUnnecessaryHostDots|purell.FlagRemoveEmptyPortSeparator)
}
// SanitizeURLKeepTrailingSlash is the same as SanitizeURL, but will keep any trailing slash.
func SanitizeURLKeepTrailingSlash(in string) string {
return sanitizeURLWithFlags(in, purell.FlagsSafe|purell.FlagRemoveDotSegments|purell.FlagRemoveDuplicateSlashes|purell.FlagRemoveUnnecessaryHostDots|purell.FlagRemoveEmptyPortSeparator)
}
// URLize is similar to MakePath, but with Unicode handling
// Example:
// uri: Vim (text editor)
// urlize: vim-text-editor
func (p *PathSpec) URLize(uri string) string {
return p.URLEscape(p.MakePathSanitized(uri))
}
// URLizeFilename creates an URL from a filename by esacaping unicode letters
// and turn any filepath separator into forward slashes.
func (p *PathSpec) URLizeFilename(filename string) string {
return p.URLEscape(filepath.ToSlash(filename))
}
// URLEscape escapes unicode letters.
func (p *PathSpec) URLEscape(uri string) string {
// escape unicode letters
parsedURI, err := url.Parse(uri)
if err != nil {
// if net/url can not parse URL it means Sanitize works incorrectly
panic(err)
}
x := parsedURI.String()
return x
}
// MakePermalink combines base URL with content path to create full URL paths.
// Example
// base: http://spf13.com/
// path: post/how-i-blog
// result: http://spf13.com/post/how-i-blog
func MakePermalink(host, plink string) *url.URL {
base, err := url.Parse(host)
if err != nil {
panic(err)
}
p, err := url.Parse(plink)
if err != nil {
panic(err)
}
if p.Host != "" {
panic(fmt.Errorf("can't make permalink from absolute link %q", plink))
}
base.Path = path.Join(base.Path, p.Path)
// path.Join will strip off the last /, so put it back if it was there.
hadTrailingSlash := (plink == "" && strings.HasSuffix(host, "/")) || strings.HasSuffix(p.Path, "/")
if hadTrailingSlash && !strings.HasSuffix(base.Path, "/") {
base.Path = base.Path + "/"
}
return base
}
// AbsURL creates an absolute URL from the relative path given and the BaseURL set in config.
func (p *PathSpec) AbsURL(in string, addLanguage bool) string {
url, err := url.Parse(in)
if err != nil {
return in
}
if url.IsAbs() || strings.HasPrefix(in, "//") {
return in
}
var baseURL string
if strings.HasPrefix(in, "/") {
u := p.BaseURL.URL()
u.Path = ""
baseURL = u.String()
} else {
baseURL = p.BaseURL.String()
}
if addLanguage {
prefix := p.GetLanguagePrefix()
if prefix != "" {
hasPrefix := false
// avoid adding language prefix if already present
if strings.HasPrefix(in, "/") {
hasPrefix = strings.HasPrefix(in[1:], prefix)
} else {
hasPrefix = strings.HasPrefix(in, prefix)
}
if !hasPrefix {
addSlash := in == "" || strings.HasSuffix(in, "/")
in = path.Join(prefix, in)
if addSlash {
in += "/"
}
}
}
}
return MakePermalink(baseURL, in).String()
}
// IsAbsURL determines whether the given path points to an absolute URL.
func IsAbsURL(path string) bool {
url, err := url.Parse(path)
if err != nil {
return false
}
return url.IsAbs() || strings.HasPrefix(path, "//")
}
// RelURL creates a URL relative to the BaseURL root.
// Note: The result URL will not include the context root if canonifyURLs is enabled.
func (p *PathSpec) RelURL(in string, addLanguage bool) string {
baseURL := p.BaseURL.String()
canonifyURLs := p.CanonifyURLs
if (!strings.HasPrefix(in, baseURL) && strings.HasPrefix(in, "http")) || strings.HasPrefix(in, "//") {
return in
}
u := in
if strings.HasPrefix(in, baseURL) {
u = strings.TrimPrefix(u, baseURL)
}
if addLanguage {
prefix := p.GetLanguagePrefix()
if prefix != "" {
hasPrefix := false
// avoid adding language prefix if already present
if strings.HasPrefix(in, "/") {
hasPrefix = strings.HasPrefix(in[1:], prefix)
} else {
hasPrefix = strings.HasPrefix(in, prefix)
}
if !hasPrefix {
hadSlash := strings.HasSuffix(u, "/")
u = path.Join(prefix, u)
if hadSlash {
u += "/"
}
}
}
}
if !canonifyURLs {
u = AddContextRoot(baseURL, u)
}
if in == "" && !strings.HasSuffix(u, "/") && strings.HasSuffix(baseURL, "/") {
u += "/"
}
if !strings.HasPrefix(u, "/") {
u = "/" + u
}
return u
}
// AddContextRoot adds the context root to an URL if it's not already set.
// For relative URL entries on sites with a base url with a context root set (i.e. http://example.com/mysite),
// relative URLs must not include the context root if canonifyURLs is enabled. But if it's disabled, it must be set.
func AddContextRoot(baseURL, relativePath string) string {
url, err := url.Parse(baseURL)
if err != nil {
panic(err)
}
newPath := path.Join(url.Path, relativePath)
// path strips traling slash, ignore root path.
if newPath != "/" && strings.HasSuffix(relativePath, "/") {
newPath += "/"
}
return newPath
}
// PrependBasePath prepends any baseURL sub-folder to the given resource
func (p *PathSpec) PrependBasePath(rel string, isAbs bool) string {
basePath := p.GetBasePath(!isAbs)
if basePath != "" {
rel = filepath.ToSlash(rel)
// Need to prepend any path from the baseURL
hadSlash := strings.HasSuffix(rel, "/")
rel = path.Join(basePath, rel)
if hadSlash {
rel += "/"
}
}
return rel
}
// URLizeAndPrep applies misc sanitation to the given URL to get it in line
// with the Hugo standard.
func (p *PathSpec) URLizeAndPrep(in string) string {
return p.URLPrep(p.URLize(in))
}
// URLPrep applies misc sanitation to the given URL.
func (p *PathSpec) URLPrep(in string) string {
if p.UglyURLs {
return Uglify(SanitizeURL(in))
}
pretty := PrettifyURL(SanitizeURL(in))
if path.Ext(pretty) == ".xml" {
return pretty
}
url, err := purell.NormalizeURLString(pretty, purell.FlagAddTrailingSlash)
if err != nil {
return pretty
}
return url
}
// PrettifyURL takes a URL string and returns a semantic, clean URL.
func PrettifyURL(in string) string {
x := PrettifyURLPath(in)
if path.Base(x) == "index.html" {
return path.Dir(x)
}
if in == "" {
return "/"
}
return x
}
// PrettifyURLPath takes a URL path to a content and converts it
// to enable pretty URLs.
// /section/name.html becomes /section/name/index.html
// /section/name/ becomes /section/name/index.html
// /section/name/index.html becomes /section/name/index.html
func PrettifyURLPath(in string) string {
return prettifyPath(in, pb)
}
// Uglify does the opposite of PrettifyURLPath().
// /section/name/index.html becomes /section/name.html
// /section/name/ becomes /section/name.html
// /section/name.html becomes /section/name.html
func Uglify(in string) string {
if path.Ext(in) == "" {
if len(in) < 2 {
return "/"
}
// /section/name/ -> /section/name.html
return path.Clean(in) + ".html"
}
name, ext := fileAndExt(in, pb)
if name == "index" {
// /section/name/index.html -> /section/name.html
d := path.Dir(in)
if len(d) > 1 {
return d + ext
}
return in
}
// /.xml -> /index.xml
if name == "" {
return path.Dir(in) + "index" + ext
}
// /section/name.html -> /section/name.html
return path.Clean(in)
}