2017-07-09 01:57:41 +02:00
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package plugins
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import (
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"bytes"
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"fmt"
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"io"
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2017-07-09 03:41:35 +02:00
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"text/template"
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2017-07-09 01:57:41 +02:00
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"github.com/osteele/gojekyll/pages"
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)
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2017-07-09 04:47:50 +02:00
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type jekyllRedirectFromPlugin struct{ plugin }
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2017-07-09 01:57:41 +02:00
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var redirectTemplate *template.Template
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func init() {
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2017-07-09 04:47:50 +02:00
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register("jekyll-redirect-from", jekyllRedirectFromPlugin{})
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2017-07-09 07:22:32 +02:00
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tmpl, err := template.New("redirect_from").Parse(redirectFromTemplateSource)
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2017-07-09 01:57:41 +02:00
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if err != nil {
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panic(err)
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}
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redirectTemplate = tmpl
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}
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2017-09-02 19:57:28 +02:00
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func (p jekyllRedirectFromPlugin) PostReadSite(site Site) error {
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2017-07-10 21:28:07 +02:00
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ps := site.Pages()
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newPages, err := p.processRedirectFrom(site, ps)
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if err != nil {
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return err
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}
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2017-07-10 21:39:17 +02:00
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if err := p.processRedirectTo(site, ps); err != nil {
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return err
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}
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2017-07-10 21:28:07 +02:00
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for _, r := range newPages {
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site.AddDocument(r, true)
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}
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return nil
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}
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func (p jekyllRedirectFromPlugin) processRedirectFrom(site Site, ps []pages.Page) ([]pages.Document, error) {
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var (
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cfg = site.Config()
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siteurl = cfg.AbsoluteURL
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baseurl = cfg.BaseURL
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prefix = siteurl + baseurl
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redirections = []pages.Document{}
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)
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addRedirectFrom := func(from string, to pages.Page) {
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2017-09-02 19:53:50 +02:00
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r := redirectionDoc{pages.PageEmbed{Path: from}, prefix + to.URL()}
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2017-07-10 21:28:07 +02:00
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redirections = append(redirections, &r)
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}
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for _, p := range ps {
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sources, err := getStringArray(p, "redirect_from")
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if err != nil {
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return nil, err
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2017-07-09 01:57:41 +02:00
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}
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2017-07-10 21:28:07 +02:00
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for _, from := range sources {
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addRedirectFrom(from, p)
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2017-07-09 01:57:41 +02:00
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}
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}
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2017-07-10 21:28:07 +02:00
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return redirections, nil
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}
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func (p jekyllRedirectFromPlugin) processRedirectTo(site Site, ps []pages.Page) error {
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for _, p := range ps {
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sources, err := getStringArray(p, "redirect_to")
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if err != nil {
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return err
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}
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if len(sources) > 0 {
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2017-09-02 19:53:50 +02:00
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r := redirectionDoc{pages.PageEmbed{Path: p.URL()}, sources[0]}
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2017-07-10 21:28:07 +02:00
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p.SetContent(r.Content())
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}
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2017-07-09 01:57:41 +02:00
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}
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return nil
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}
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2017-07-10 21:28:07 +02:00
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func getStringArray(p pages.Page, fieldName string) (out []string, err error) {
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if value, ok := p.FrontMatter()[fieldName]; ok {
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switch value := value.(type) {
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case []string:
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out = value
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case []interface{}:
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out = make([]string, len(value))
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for i, item := range value {
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out[i] = fmt.Sprintf("%s", item)
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}
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case string:
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out = []string{value}
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default:
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err = fmt.Errorf("unimplemented redirect_from type %T", value)
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}
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}
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return
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}
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2017-07-09 07:22:32 +02:00
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type redirectionDoc struct {
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2017-07-25 17:24:37 +02:00
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pages.PageEmbed
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To string
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2017-07-09 07:22:32 +02:00
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}
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2017-08-10 15:06:53 +02:00
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func (d *redirectionDoc) Content() string {
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2017-07-09 07:22:32 +02:00
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buf := new(bytes.Buffer)
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if err := redirectTemplate.Execute(buf, d); err != nil {
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panic(err)
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}
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2017-08-10 15:06:53 +02:00
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return buf.String()
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2017-07-09 07:22:32 +02:00
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}
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2017-07-10 19:23:51 +02:00
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func (d *redirectionDoc) Write(w io.Writer) error {
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2017-07-09 07:22:32 +02:00
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return redirectTemplate.Execute(w, d)
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}
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2017-07-09 01:57:41 +02:00
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// Adapted from https://github.com/jekyll/jekyll-redirect-from
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2017-07-09 07:22:32 +02:00
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const redirectFromTemplateSource = `<!DOCTYPE html>
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2017-07-09 01:57:41 +02:00
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<html lang="en-US">
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<meta charset="utf-8">
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2017-07-09 03:41:35 +02:00
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<title>Redirecting…</title>
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2017-08-10 15:06:53 +02:00
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<link rel="canonical" href="{{.To}}">
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<meta http-equiv="refresh" content="0; url={{.To}}">
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2017-07-09 01:57:41 +02:00
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<meta name="robots" content="noindex">
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2017-07-09 03:41:35 +02:00
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<h1>Redirecting…</h1>
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2017-08-10 15:06:53 +02:00
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<a href="{{.To}}">Click here if you are not redirected.</a>
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<script>location="{{.To}}"</script>
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2017-07-09 01:57:41 +02:00
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</html>`
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