Discreet Drafts in Hugo

Published: Nov 26, 2021 • Updated: Jan 18, 2022

I sometimes pass around blog post drafts to friends and family for review. It’s usually by email or text, which is fine. Yet, it would be cool if I could give them a real link, a discreet draft, if you will.

I did a bit of searching on the Hugo Discourse forums, and of course, I was not the first person with this idea. A few others had implemented custom solutions, but I didn’t see a writeup of how to do it from scratch. When encountering a knowledge gap like this, my tutorial-spidey-sense tingles, and I knew it was time to take a stab.

Demo #

I made a minimal, reproducible example on GitHub, so if you’re a “show me the money” type person, feel free to check that out first.

Requirements #

Before we dive into how to do it, let’s talk about what it would look like. Also, note that my blog list relative URL is /blog/, but to keep things generic, we’ll use /posts/ since that’s more common in Hugo-land. Okay, the requirements:

Build Drafts #

We’ll start by telling Hugo to build drafts. Do one of the following steps:

Branch Bundles #

Your content/posts/_index.md file likely already exists, since this lets you define the title for the post list template. But if it doesn’t, create it.

Create a content/drafts/_index.md file. Then in the front matter set draft to true. This _index.md file should be the only file in the content/drafts directory. We just need it there so that Hugo will render the drafts template correctly.

---
title: "Drafts"
draft: true
---

List Template #

The following list templates will be the same because they both reference the partial.

Create each file with the following:

{{ define "main" }}
  {{ partial "posts-list.html" . }}
{{ end }}

We use a partial here because the layout logic for the post vs draft list is virtually the same. The only difference is whether drafts are shown.

Okay, let’s break it down. We start by defining an $isPosts variable. If $isPosts is true, we know the current context is the posts list. Otherwise, we know the drafts list is the current context.

Then we define a $pages variable which gets all the pages in the posts section.

Then we do our filtering. If $isPosts is true, we reassign $pages with all non-draft posts. Otherwise, we reassign $pages with all draft posts.

Finally, we do some things you’re used to: show the page title, and iterate the $pages to create a list of posts.

Create file layouts/partials/posts-list.html with the following:

{{ $isPosts := eq .RelPermalink "/posts/" }}

{{ $pages := where site.RegularPages.ByPublishDate.Reverse "Section" "==" "posts" }}

{{ if $isPosts }}
  {{ $pages = where $pages "Draft" "==" false }}
{{ else }}
  {{ $pages = where $pages "Draft" "==" true }}
{{ end }}

<h1>{{ .Title }}</h1>

<ul>
{{ range $pages }}
  <li>
    <a href="{{ .RelPermalink }}">{{ .Title }}</a>
  </li>
{{ end }}
</ul>

RSS Feed Template #

When writing this tutorial, an unexpected, but pleasant issue was opened 🙂. Since drafts are now built by Hugo, we must tell the RSS feed template to exclude them.

Don’t let this code scare you. It’s the default Hugo RSS template, and I copied it as-is. I only added this line:

{{- $pages = where $pages "Draft" "==" false -}}

The following list templates will be the same because they both reference the partial.

Create each file with the following:

{{- partial "rss.xml" . -}}

We use a partial again because for the RSS template, the code is actually the same, and only the context is different.

Create file layouts/partials/rss.xml with the following:

{{- $pctx := . -}}
{{- if .IsHome -}}{{ $pctx = .Site }}{{- end -}}
{{- $pages := slice -}}
{{- if or $.IsHome $.IsSection -}}
{{- $pages = $pctx.RegularPages -}}
{{- else -}}
{{- $pages = $pctx.Pages -}}
{{- end -}}
{{- $pages = where $pages "Draft" "==" false -}}
{{- $limit := .Site.Config.Services.RSS.Limit -}}
{{- if ge $limit 1 -}}
{{- $pages = $pages | first $limit -}}
{{- end -}}
{{- printf "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?>" | safeHTML }}
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
  <channel>
    <title>{{ if eq  .Title  .Site.Title }}{{ .Site.Title }}{{ else }}{{ with .Title }}{{.}} on {{ end }}{{ .Site.Title }}{{ end }}</title>
    <link>{{ .Permalink }}</link>
    <description>Recent content {{ if ne  .Title  .Site.Title }}{{ with .Title }}in {{.}} {{ end }}{{ end }}on {{ .Site.Title }}</description>
    <generator>Hugo -- gohugo.io</generator>{{ with .Site.LanguageCode }}
    <language>{{.}}</language>{{end}}{{ with .Site.Author.email }}
    <managingEditor>{{.}}{{ with $.Site.Author.name }} ({{.}}){{end}}</managingEditor>{{end}}{{ with .Site.Author.email }}
    <webMaster>{{.}}{{ with $.Site.Author.name }} ({{.}}){{end}}</webMaster>{{end}}{{ with .Site.Copyright }}
    <copyright>{{.}}</copyright>{{end}}{{ if not .Date.IsZero }}
    <lastBuildDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</lastBuildDate>{{ end }}
    {{- with .OutputFormats.Get "RSS" -}}
    {{ printf "<atom:link href=%q rel=\"self\" type=%q />" .Permalink .MediaType | safeHTML }}
    {{- end -}}
    {{ range $pages }}
    <item>
      <title>{{ .Title }}</title>
      <link>{{ .Permalink }}</link>
      <pubDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</pubDate>
      {{ with .Site.Author.email }}<author>{{.}}{{ with $.Site.Author.name }} ({{.}}){{end}}</author>{{end}}
      <guid>{{ .Permalink }}</guid>
      <description>{{ .Summary | html }}</description>
    </item>
    {{ end }}
  </channel>
</rss>

Sitemap Template #

I posted this tutorial on the forums and @davidsneighbour pointed out that the sitemap template would need updating as well.

So let’s fix that. Similarly to the previous section, we can tweak the default Hugo sitemap template.

I changed this:

{{ range .Data.Pages }}

To be this:

{{ $pages := where .Data.Pages "Draft" "==" false }}
{{ range $pages }}

Create file layouts/sitemap.xml with the following:

{{ printf "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?>" | safeHTML }}
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
  xmlns:xhtml="http://www.w3.org/1999/xhtml">
  {{ $pages := where .Data.Pages "Draft" "==" false }}
  {{ range $pages }}
  <url>
    <loc>{{ .Permalink }}</loc>{{ if not .Lastmod.IsZero }}
    <lastmod>{{ safeHTML ( .Lastmod.Format "2006-01-02T15:04:05-07:00" ) }}</lastmod>{{ end }}{{ with .Sitemap.ChangeFreq }}
    <changefreq>{{ . }}</changefreq>{{ end }}{{ if ge .Sitemap.Priority 0.0 }}
    <priority>{{ .Sitemap.Priority }}</priority>{{ end }}{{ if .IsTranslated }}{{ range .Translations }}
    <xhtml:link
                rel="alternate"
                hreflang="{{ .Language.Lang }}"
                href="{{ .Permalink }}"
                />{{ end }}
    <xhtml:link
                rel="alternate"
                hreflang="{{ .Language.Lang }}"
                href="{{ .Permalink }}"
                />{{ end }}
  </url>
  {{ end }}
</urlset>

Block Search Indexing #

We don’t want search engines to index draft pages, so let’s use a noindex meta tag to prevent this.

Edit file layouts/_default/baseof.html with the following. Add it within the head element:

{{ if eq .Draft true }}
  <meta name="robots" content="noindex">
{{ end }}

Password Protection #

For fun, let’s add (naive) password protection. This will keep out nontechnical folks. But savvy readers will be able to bypass this with DevTools.

This little sprinkling of vanilla JavaScript does the job:

Create file assets/js/draft.js with the following:

(function () {
  const PASSWORD = 'please';
  const DIV_BACKGROUND_COLOR = '#fcfcfc';
  const DIV_ID = 'draft_div';
  const INPUT_ID = 'draft_input';

  const createDiv = () => {
    const div = document.createElement('div');
    div.id = DIV_ID;
    div.style.display = 'flex';
    div.style.justifyContent = 'center';
    div.style.alignItems = 'center';
    div.style.position = 'fixed';
    div.style.top = 0;
    div.style.left = 0;
    div.style.width = '100%';
    div.style.height = '100%';
    div.style.backgroundColor = DIV_BACKGROUND_COLOR;
    return div;
  };

  const removeDiv = () => {
    const div = document.getElementById(DIV_ID);
    div.remove();
  };

  const handleSubmit = event => {
    event.preventDefault();
    const inputPassword = document.getElementById(INPUT_ID).value;
    if (inputPassword === PASSWORD) {
      removeDiv();
    }
  };

  const createForm = () => {
    const form = document.createElement('form');
    form.addEventListener('submit', handleSubmit);
    return form;
  };

  const createInput = () => {
    const input = document.createElement('input');
    input.id = INPUT_ID;
    input.type = 'password';
    input.autocomplete = 'one-time-code';
    input.placeholder = 'Password';
    return input;
  };

  const main = () => {
    const div = createDiv();
    const form = createForm();
    const input = createInput();
    form.appendChild(input);
    div.appendChild(form);
    document.body.appendChild(div);
  };

  main();
})();

Edit file layouts/_default/baseof.html with the following. Add it to the end of the body element:

{{ if eq .Draft true }}
  {{ $draftJs := resources.Get "js/draft.js"
    | minify
    | fingerprint }}
  <script
    src="{{ $draftJs.RelPermalink }}"
    integrity="{{ $draftJs.Data.Integrity }}"
  ></script>
{{ end }}

Closing Thoughts #

The draft front matter param is personal preference in this case. You could have created a new param, like preview. I chose to use draft since its meaning is clear.

With this setup, the drafts are still public, in the sense that anyone with the right URL can read them. The idea is that you don’t advertise the drafts list, and only share it as needed.

Anyways, I hope this was helpful. If only I would spend more time writing, and less time tweaking. Alas, ha.

Alternatives #

Rereading this tutorial, I admit it’s a bit… involved. Here are some less friction alternatives.

You could make a new git branch for your (non draft) post, let your CI platform build it, then send that link to your readers. This is what Mark Allison does.

Another variant: Deploy a separate environment where drafts are built, then send your readers there.