hugo/hugolib/site_writer.go

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// Copyright 2017 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 hugolib
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import (
"fmt"
"io"
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"path/filepath"
"runtime"
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"strings"
"github.com/spf13/hugo/helpers"
"github.com/spf13/hugo/hugofs"
jww "github.com/spf13/jwalterweatherman"
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)
// We may find some abstractions/interface(s) here once we star with
// "Multiple Output Types".
type siteWriter struct {
langDir string
publishDir string
relativeURLs bool
uglyURLs bool
allowRoot bool // For aliases
fs *hugofs.Fs
log *jww.Notepad
}
func (w siteWriter) targetPathPage(src string) (string, error) {
dir, err := w.baseTargetPathPage(src)
if err != nil {
return "", err
}
if w.publishDir != "" {
dir = filepath.Join(w.publishDir, dir)
}
return dir, nil
}
func (w siteWriter) baseTargetPathPage(src string) (string, error) {
if src == helpers.FilePathSeparator {
return "index.html", nil
}
dir, file := filepath.Split(src)
isRoot := dir == ""
ext := extension(filepath.Ext(file))
name := filename(file)
if w.langDir != "" && dir == helpers.FilePathSeparator && name == w.langDir {
return filepath.Join(dir, name, "index"+ext), nil
}
if w.uglyURLs || file == "index.html" || (isRoot && file == "404.html") {
return filepath.Join(dir, name+ext), nil
}
dir = filepath.Join(dir, name, "index"+ext)
return dir, nil
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}
func (w siteWriter) targetPathFile(src string) (string, error) {
return filepath.Join(w.publishDir, filepath.FromSlash(src)), nil
}
func (w siteWriter) targetPathAlias(src string) (string, error) {
originalAlias := src
if len(src) <= 0 {
return "", fmt.Errorf("Alias \"\" is an empty string")
}
alias := filepath.Clean(src)
components := strings.Split(alias, helpers.FilePathSeparator)
if !w.allowRoot && alias == helpers.FilePathSeparator {
return "", fmt.Errorf("Alias \"%s\" resolves to website root directory", originalAlias)
}
// Validate against directory traversal
if components[0] == ".." {
return "", fmt.Errorf("Alias \"%s\" traverses outside the website root directory", originalAlias)
}
// Handle Windows file and directory naming restrictions
// See "Naming Files, Paths, and Namespaces" on MSDN
// https://msdn.microsoft.com/en-us/library/aa365247%28v=VS.85%29.aspx?f=255&MSPPError=-2147217396
msgs := []string{}
reservedNames := []string{"CON", "PRN", "AUX", "NUL", "COM0", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9", "LPT0", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9"}
if strings.ContainsAny(alias, ":*?\"<>|") {
msgs = append(msgs, fmt.Sprintf("Alias \"%s\" contains invalid characters on Windows: : * ? \" < > |", originalAlias))
}
for _, ch := range alias {
if ch < ' ' {
msgs = append(msgs, fmt.Sprintf("Alias \"%s\" contains ASCII control code (0x00 to 0x1F), invalid on Windows: : * ? \" < > |", originalAlias))
continue
}
}
for _, comp := range components {
if strings.HasSuffix(comp, " ") || strings.HasSuffix(comp, ".") {
msgs = append(msgs, fmt.Sprintf("Alias \"%s\" contains component with a trailing space or period, problematic on Windows", originalAlias))
}
for _, r := range reservedNames {
if comp == r {
msgs = append(msgs, fmt.Sprintf("Alias \"%s\" contains component with reserved name \"%s\" on Windows", originalAlias, r))
}
}
}
if len(msgs) > 0 {
if runtime.GOOS == "windows" {
for _, m := range msgs {
w.log.ERROR.Println(m)
}
return "", fmt.Errorf("Cannot create \"%s\": Windows filename restriction", originalAlias)
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}
for _, m := range msgs {
w.log.WARN.Println(m)
}
}
// Add the final touch
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alias = strings.TrimPrefix(alias, helpers.FilePathSeparator)
if strings.HasSuffix(alias, helpers.FilePathSeparator) {
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alias = alias + "index.html"
} else if !strings.HasSuffix(alias, ".html") {
alias = alias + helpers.FilePathSeparator + "index.html"
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}
if originalAlias != alias {
w.log.INFO.Printf("Alias \"%s\" translated to \"%s\"\n", originalAlias, alias)
}
return filepath.Join(w.publishDir, alias), nil
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}
func extension(ext string) string {
switch ext {
case ".md", ".rst":
return ".html"
}
if ext != "" {
return ext
}
return ".html"
}
func filename(f string) string {
ext := filepath.Ext(f)
if ext == "" {
return f
}
return f[:len(f)-len(ext)]
}
func (w siteWriter) writeDestPage(path string, reader io.Reader) (err error) {
w.log.DEBUG.Println("creating page:", path)
targetPath, err := w.targetPathPage(path)
if err != nil {
return err
}
return w.publish(targetPath, reader)
}
func (w siteWriter) writeDestFile(path string, r io.Reader) (err error) {
w.log.DEBUG.Println("creating file:", path)
targetPath, err := w.targetPathFile(path)
if err != nil {
return err
}
return w.publish(targetPath, r)
}
func (w siteWriter) publish(path string, r io.Reader) (err error) {
return helpers.WriteToDisk(path, r, w.fs.Destination)
}