149 lines
4.8 KiB
Go
149 lines
4.8 KiB
Go
// Copyright 2016 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package target
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import (
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"bytes"
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"fmt"
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"html/template"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/spf13/hugo/helpers"
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"github.com/spf13/hugo/hugofs"
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jww "github.com/spf13/jwalterweatherman"
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)
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const alias = "<!DOCTYPE html><html><head><link rel=\"canonical\" href=\"{{ .Permalink }}\"/><meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\" /><meta http-equiv=\"refresh\" content=\"0;url={{ .Permalink }}\" /></head></html>"
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const aliasXHtml = "<!DOCTYPE html><html xmlns=\"http://www.w3.org/1999/xhtml\"><head><link rel=\"canonical\" href=\"{{ .Permalink }}\"/><meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\" /><meta http-equiv=\"refresh\" content=\"0;url={{ .Permalink }}\" /></head></html>"
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var defaultAliasTemplates *template.Template
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func init() {
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defaultAliasTemplates = template.New("")
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template.Must(defaultAliasTemplates.New("alias").Parse(alias))
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template.Must(defaultAliasTemplates.New("alias-xhtml").Parse(aliasXHtml))
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}
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type AliasPublisher interface {
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Translator
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Publish(string, string) error
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}
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type HTMLRedirectAlias struct {
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PublishDir string
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Templates *template.Template
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}
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func (h *HTMLRedirectAlias) Translate(alias string) (aliasPath string, err error) {
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originalAlias := alias
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if len(alias) <= 0 {
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return "", fmt.Errorf("Alias \"\" is an empty string")
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}
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alias = filepath.Clean(alias)
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components := strings.Split(alias, helpers.FilePathSeparator)
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if alias == helpers.FilePathSeparator {
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return "", fmt.Errorf("Alias \"%s\" resolves to website root directory", originalAlias)
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}
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// Validate against directory traversal
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if components[0] == ".." {
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return "", fmt.Errorf("Alias \"%s\" traverses outside the website root directory", originalAlias)
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}
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// Handle Windows file and directory naming restrictions
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// See "Naming Files, Paths, and Namespaces" on MSDN
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// https://msdn.microsoft.com/en-us/library/aa365247%28v=VS.85%29.aspx?f=255&MSPPError=-2147217396
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msgs := []string{}
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reservedNames := []string{"CON", "PRN", "AUX", "NUL", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9"}
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if strings.ContainsAny(alias, ":*?\"<>|") {
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msgs = append(msgs, fmt.Sprintf("Alias \"%s\" contains invalid characters on Windows: : * ? \" < > |", originalAlias))
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}
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for _, ch := range alias {
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if ch < ' ' {
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msgs = append(msgs, fmt.Sprintf("Alias \"%s\" contains ASCII control code (0x00 to 0x1F), invalid on Windows: : * ? \" < > |", originalAlias))
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continue
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}
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}
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for _, comp := range components {
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if strings.HasSuffix(comp, " ") || strings.HasSuffix(comp, ".") {
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msgs = append(msgs, fmt.Sprintf("Alias \"%s\" contains component with a trailing space or period, problematic on Windows", originalAlias))
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}
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for _, r := range reservedNames {
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if comp == r {
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msgs = append(msgs, fmt.Sprintf("Alias \"%s\" contains component with reserved name \"%s\" on Windows", originalAlias, r))
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}
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}
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}
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if len(msgs) > 0 {
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if runtime.GOOS == "windows" {
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for _, m := range msgs {
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jww.ERROR.Println(m)
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}
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return "", fmt.Errorf("Cannot create \"%s\": Windows filename restriction", originalAlias)
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}
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for _, m := range msgs {
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jww.WARN.Println(m)
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}
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}
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// Add the final touch
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if strings.HasPrefix(alias, helpers.FilePathSeparator) {
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alias = alias[1:]
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}
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if strings.HasSuffix(alias, helpers.FilePathSeparator) {
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alias = alias + "index.html"
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} else if !strings.HasSuffix(alias, ".html") {
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alias = alias + helpers.FilePathSeparator + "index.html"
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}
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if originalAlias != alias {
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jww.INFO.Printf("Alias \"%s\" translated to \"%s\"\n", originalAlias, alias)
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}
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return filepath.Join(h.PublishDir, alias), nil
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}
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type AliasNode struct {
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Permalink string
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}
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func (h *HTMLRedirectAlias) Publish(path string, permalink string) (err error) {
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if path, err = h.Translate(path); err != nil {
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jww.ERROR.Printf("%s, skipping.", err)
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return nil
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}
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t := "alias"
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if strings.HasSuffix(path, ".xhtml") {
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t = "alias-xhtml"
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}
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template := defaultAliasTemplates
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if h.Templates != nil {
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template = h.Templates
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}
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buffer := new(bytes.Buffer)
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err = template.ExecuteTemplate(buffer, t, &AliasNode{permalink})
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if err != nil {
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return
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}
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return helpers.WriteToDisk(path, buffer, hugofs.Destination())
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}
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