gemini

Nex in CapsulePress

I’ve added Nex support to CapsulePress!

What does that mean?

Nex is a lightweight Internet protocol reminiscent to me of Spartan (which CapsulePress also supports), but even more lightweight. Without even affordances like host identification, MIME types, response codes, or the expectation that Gemtext might be supported by the client, it’s perhaps more like Gopher than it is like Gemini.

It comes from the ever-entertaining smolweb hub of Nightfall City, whose Web interface clearly states at the top of every page the command you could have run to see that content over the Nex protocol. Lagrange added support for Nex almost a year ago and it’s such a lightweight protocol that I was quickly able to adapt CapsulePress’s implementation of Spartan to support Nex, too.

require 'gserver'
require 'word_wrap'
require 'word_wrap/core_ext'

class NexServer < GServer
  def initialize
    super(
      (ENV['NEX_PORT'] ? ENV['NEX_PORT'].to_i                           : 1900),
      (ENV['NEX_HOST']                                                 || '0.0.0.0'),
      (ENV['NEX_MAX_CONNECTIONS'] ? ENV['NEX_MAX_CONNECTIONS'].to_i : 4)
    )
  end

  def handle(io, req)
    puts "Nex: handling"
    io.print "\r\n"
    req = '/' if req == ''
    if response = CapsulePress.handle(req, 'nex')
      io.print response[:body].wrap(79)
    else
      io.print "Document not found\r\n"
    end
  end

  def serve(io)
    puts "Nex: client connected"
    req = io.gets.strip
    handle(io, req)
  end
end

This is genuinely the entirety of my implementation of my Nex server, atop CapsulePress. And it’s mostly boilerplate.

Why, you might ask? Well, the reasons are the same as all the other standards supported by CapsulePress:

The smolweb is awesome.
Making WordPress into a CMS things it was never meant to do is sorta my jam.
It was a quick win while I waited for the pharmacist to shoot me up with ~~5G microchips~~ my ‘flu and Covid boosters.

If you want to add Nex onto your CapsulePress, just git pull the latest version, ensure TCP port 1900 isn’t firewalled, and don’t add USE_NEX=false to your environment. That’s all!

So… I’m A Podcast

Duration 10:25

Podcast Version

This post is also available as a podcast. Listen here, download for later, or subscribe wherever you consume podcasts.

Observant readers might have noticed that some of my recent blog posts – like the one about special roads, my idea for pressure-cooking tea, and the one looking at the history of window tax in two countries¹ – are also available as podcast.

Why?

Like my occasional video content, this isn’t designed to replace any of my blogging: it’s just a different medium for those that might prefer it.

For some stories, I guess that audio might be a better way to find out what I’ve been thinking about. Just like how the vlog version of my post about my favourite video game Easter Egg might be preferable because video as a medium is better suited to demonstrating a computer game, perhaps audio’s the right medium for some of the things I write about, too?

But as much as not, it’s just a continuation of my efforts to explore different media over which a WordPress blog can be delivered². Also, y’know, my ongoing effort to do what I’m bad at in the hope that I might get better at a wider diversity of skills.

How?

Let’s start by understanding what a “podcast” actually is. It is, in essence, just an RSS feed (something you might have heard me talk about before…) with audio enclosures – basically, “attachments” – on each item. The idea was spearheaded by Dave Winer back in 2001 as a way of subscribing to rich media like audio or videos in such a way that slow Internet connections could pre-download content so you didn’t have to wait for it to buffer.³

Here’s what I had to do to add podcasting capability to my theme:

The tag

I use a post tag, dancast, to represent posts with accompanying podcast content⁴. This way, I can add all the podcast-specific metadata only if the user requests the feed of that tag, and leave my regular feeds untampered . This means that you don’t get the podcast enclosures in the regular subscription; that might not be what everybody would want, but it suits me to serve podcasts only to people who explicitly ask for them.

It also means that I’m able to use a template, tag-dancast.php, in my theme to generate a customised page for listing podcast episodes.

The feed

Okay, onto the code (which I’ve open-sourced over here). I’ve use a series of standard WordPress hooks to add the functionality I need. The important bits are:

rss2_item – to add the <enclosure>, <itunes:duration>, <itunes:image>, and <itunes:explicit> elements to the feed, when requesting a feed with my nominated tag. Only <enclosure> is strictly required, but appeasing Apple Podcasts is worthwhile too. These are lifted directly from the post metadata.
the_excerpt_rss – I have another piece of post metadata in which I can add a description of the podcast (in practice, a list of chapter times); this hook swaps out the existing excerpt for my custom one in podcast feeds.
rss_enclosure – some podcast syndication platforms and players can’t cope with RSS feeds in which an item has multiple enclosures, so as a safety precaution I strip out any enclosures that WordPress has already added (e.g. the featured image).
the_content_feed – my RSS feed usually contains the full text of every post, because I don’t like feeds that try to force you to go to the original web page⁵ and I don’t want to impose that on others. But for the podcast feed, the text content of the post is somewhat redundant so I drop it.
rss2_ns – of critical importance of course is adding the relevant namespaces to your XML declaration. I use the itunes namespace, which provides the widest compatibility for specifying metadata, but I also use the newer podcast namespace, which has growing compatibility and provides some modern features, most of which I don’t use except specifying a license. There’s no harm in supporting both.
rss2_head – here’s where I put in the metadata for the podcast as a whole: license, category, type, and so on. Some of these fields are effectively essential for best support.

You’re welcome, of course, to lift any of all of the code for your own purposes. WordPress makes a perfectly reasonable platform for podcasting-alongside-blogging, in my experience.

What?

Finally, there’s the question of what to podcast about.

My intention is to use podcasting as an alternative medium to my traditional blog posts. But not every blog post is suitable for conversion into a podcast! Ones that rely on images (like my post about dithering) aren’t a great choice. Ones that have lots of code that you might like to copy-and-paste are especially unsuitable.

Dan, a microphone in front of him, smiles at the camera. — You’re listening to Radio Dan. 100% Dan, 100% of the time.(Also I suppose you might be able to hear my dog snoring in the background…)

Also: sometimes I just can’t be bothered. It’s already some level of effort to write a blog post; it’s like an extra 25% effort on top of that to record, edit, and upload a podcast version of it.

That’s not nothing, so I’ve tended to reserve podcasts for blog posts that I think have a sort-of eccentric “general interest” vibe to them. When I learn something new and feel the need to write a thousand words about it… that’s the kind of content that makes it into a podcast episode.

Which is why I’ve been calling the endeavour “a podcast nobody asked for, about things only Dan Q cares about”. I’m capable of getting nerdsniped easily and can quickly find my way down a rabbit hole of learning. My podcast is, I guess, just a way of sharing my passion for trivial deep dives with the rest of the world.

My episodes are probably shorter than most podcasts: my longest so far is around fifteen minutes, but my shortest is only two and a half minutes and most are about seven. They’re meant to be a bite-size alternative to reading a post for people who prefer to put things in their ears than into their eyes.

Anyway: if you’re not listening already, you can subscribe from here or in your favourite podcasting app. Or you can just follow my blog as normal and look for a streamable copy of podcasts at the top of selected posts (like this one!).

Footnotes

¹ I’ve also retroactively recorded a few older ones. Have a look/listen!

² As well as Web-based non-textual content like audio (podcasts) and video (vlogs), my blog is wholly or partially available over a variety of more-exotic protocols: did you find me yet on Gemini (gemini://danq.me/), Spartan (spartan://danq.me/), Gopher (gopher://danq.me/), and even Finger (finger://danq.me/, or run e.g. finger blog@danq.me from your command line)? Most of these are powered by my very own tool CapsulePress, and I’m itching to try a few more… how about a WordPress blog that’s accessible over FTP, NNTP, or DNS? I’m not even kidding when I say I’ve got ideas for these…

³ Nowadays, we have specialised media decoder co-processors which reduce the size of media files. But more-importantly, today’s high-speed always-on Internet connections mean that you probably rarely need to make a conscious choice between streaming or downloading.

⁴ I actually intended to change the tag to podcast when I went-live, but then I forgot, and now I can’t be bothered to change it. It’s only for my convenience, after all!

⁵ I’m very grateful that my favourite feed reader makes it possible to, for example, use a CSS selector to specify the page content it should pre-download for you! It means I get to spend more time in my feed reader.

Gemini Squared

How did I never think of accessing Gemini (the protocol) on my Gemini (portable computer) before today?

Of course, I recently rehomed my Gemini so instead I had to access Gemini on my Cosmo (Gemini’s successor), which isn’t nearly as cool.¹

Footnotes

¹ Still pretty cool though. Reminds me of using Lynx on my Psion 5mx last millenium…

Gemini and Spartan without a browser

A particular joy of the Gemini and Spartan protocols – and the Markdown-like syntax of Gemtext – is their simplicity.

Even without a browser, you can usually use everyday command-line tools that you might have installed already to access relatively human-readable content.

Here are a few different command-line options that should show you a copy of this blog post (made available via CapsulePress, of course):

Gemini

Gemini communicates over a TLS-encrypted channel (like HTTPS), so we need a to use a tool that speaks the language. Luckily: unless you’re on Windows you’ve probably got one installed already¹.

Using OpenSSL

This command takes the full gemini:// URL you’re looking for and the domain name it’s at. 1965 refers to the port number on which Gemini typically runs –

printf "gemini://danq.me/posts/gemini-without-a-browser\r\n" | \
  openssl s_client -ign_eof -connect danq.me:1965

Using GnuTLS

GnuTLS closes the connection when STDIN closes, so we use cat to keep it open. Note inclusion of --no-ca-verification to allow self-signed certificates (optionally add --tofu for trust-on-first-use support, per the spec).

{ printf "gemini://danq.me/posts/gemini-without-a-browser\r\n"; cat -; } | \
  gnutls-cli --no-ca-verification danq.me:1965

Using Ncat

Netcat reimplementation Ncat makes Gemini requests easy:

printf "gemini://danq.me/posts/gemini-without-a-browser\r\n" | \
  ncat --ssl danq.me 1965

Spartan

Spartan is a little like “Gemini without TLS“, but it sports an even-more-lightweight request format which makes it especially easy to fudge requests².

Using Telnet

Note the use of cat to keep the connection open long enough to get a response, as we did for Gemini over GnuTLS.

{ printf "danq.me /posts/gemini-without-a-browser 0\r\n"; cat -; } | \
  telnet danq.me 300

Using cURL

cURL supports the telnet protocol too, which means that it can be easily coerced into talking Spartan:

printf "danq.me /posts/gemini-without-a-browser 0\r\n" | \
  curl telnet://danq.me:300

Using Ncat/Netcat

Because TLS support isn’t needed, this also works perfectly well with Netcat – just substitute nc/netcat or whatever your platform calls it in place of ncat:

printf "danq.me /posts/gemini-without-a-browser 0\r\n" | \
  ncat danq.me 300

I hope these examples are useful to somebody debugging their capsule, someday.

Footnotes

¹ You can still install one on Windows, of course, it’s just less-likely that your operating system came with such a command-line tool built-in

² Note that the domain and path are separated in a Spartan request and followed by the size of the request payload body: zero in all of my examples

CapsulePress – Gemini / Spartan / Gopher to WordPress bridge

For a while now, this site has been partially mirrored via the Gemini¹ and Gopher protocols.² Earlier this year I presented hacky versions of the tools I’d used to acieve this (and made people feel nostalgic).

Now I’ve added support for Spartan³ too and, seeing as the implementations shared functionality, I’ve combined all three – Gemini, Spartan, and Gopher – into a single package: CapsulePress.

CapsulePress is a Gemini/Spartan/Gopher to WordPress bridge. It lets you use WordPress as a CMS for any or all of those three non-Web protocols in addition to the Web.

For example, that means that this post is available on all of:

my weblog, at https://danq.me/2023/09/10/capsulepress‎,
my gemlog, at gemini://danq.me/posts/capsulepress,
my spartanlog, at spartan://danq.me/posts/capsulepress, and
my goperhole, at gopher://danq.me/1/posts/capsulepress

It’s also possible to write posts that selectively appear via different media: if I want to put something exclusively on my gemlog, I can, by assigning metadata that tells WordPress to suppress a post but still expose it to CapsulePress. Neat!

90s-style web banners in the style of Netscape ads, saying "Gemini now!", "Spartan now!", and "Gopher now!". Beneath then a wider banner ad promotes CapsulePress v0.1. — Using Gemini and friends in the 2020s make me feel like the dream of the Internet of the nineties and early-naughties is still alive. But with fewer banner ads.

I’ve open-sourced the whole thing under a super-permissive license, so if you want your own WordPress blog to “feed” your Gemlog… now you can. With a few caveats:

It’s hard to use. While not as hacky as the disparate piles of code it replaced, it’s still not the cleanest. To modify it you’ll need a basic comprehension of all three protocols, plus Ruby, SQL, and sysadmin skills.
It’s super opinionated. It’s very much geared towards my use case. It’s improved by the use of templates. but it’s still probably only suitable for this site for the time being, until you make changes.
It’s very-much unfinished. I’ve got a growing to-do list, which should be a good clue that it’s Not Finished. Maybe it never will but. But there’ll be changes yet to come.

Whether or not your WordPress blog makes the jump to Geminispace⁴, I hope you’ll came take a look at mine at one of the URLs linked above, and then continue to explore.

If you’re nostalgic for the interpersonal Internet – or just the idea of it, if you’re too young to remember it… you’ll find it there. (That Internet never actually went away, but it’s harder to find on today’s big Web than it is on lighter protocols.)

Footnotes

¹ Also available via Gemini.

² Also via Finger (but that’s another story).

³ Also available via Spartan.

⁴ Need a browser? I suggest Lagrange.

Yesterday’s Internet Today! (Woo DM 2023)

The week before last I had the opportunity to deliver a “flash talk” of up to 4 minutes duration at a work meetup in Vienna, Austria. I opted to present a summary of what I’ve learned while adding support for Finger and Gopher protocols to the WordPress installation that powers DanQ.me (I also hinted at the fact that I already added Gemini and Spring ’83 support, and I’m looking at other protocols). If you’d like to see how it went, you can watch my flash talk here or on YouTube.

If you love the idea of working from wherever-you-are but ocassionally meeting your colleagues in person for fabulous in-person events with (now optional) flash talks like this, you might like to look at Automattic’s recruitment pages…

The presentation is a shortened, Automattic-centric version of a talk I’ll be delivering tomorrow at Oxford Geek Nights #53; so if you’d like to see it in-person and talk protocols with me over a beer, you should come along! There’ll probably be blog posts to follow with a more-detailed look at the how-and-why of using WordPress as a CMS not only for the Web but for a variety of zany, clever, retro, and retro-inspired protocols down the line, so perhaps consider the video above a “teaser”, I guess?

Spring ’83 Came And Went

Just in time for Robin Sloan to give up on Spring ’83, earlier this month I finally got aroud to launching STS-6 (named for the first mission of the Space Shuttle Challenger in Spring 1983), my experimental Spring ’83 server. It’s been a busy year; I had other things to do. But you might have guessed that something like this had been under my belt when I open-sourced a keygenerator for the protocol the other day.

If you’ve not played with Spring ’83, this post isn’t going to make much sense to you. Sorry.

Introducing STS-6

My server is, as far as I can tell, very different from any others in a few key ways:

It does not allow third-party publishing at all. Some might argue that this undermines the aim of the exercise, but I disagree. My IndieWeb inclinations lead me to favour “self-hosted” content, shared from its owners’ domain. Also: the specification clearly states that a server must implement a denylist… I guess my denylist simply includes all keys that are not specifically permitted.
It’s geared towards dynamic content. My primary board self-publishes whenever I produce a new blog post, listing the most recent blog posts published. I have another half-implemented which shows a summary of the most-recent post, and another which would would simply use a WordPress page as its basis – yes, this was content management, but published over Spring ’83.
It provides helpers to streamline content production. It supports internal references to other boards you control using the format {{board:123}}which are automatically converted to addresses referencing the public key of the “current” keypair for that board. This separates the concept of a board and its content template from that board’s keypairs, making it easier to link to a board. To put it another way, STS-6 links are self-healing on the server-side (for local boards).
It helps automate content-fitting. Spring ’83 strictly requires a maximum board size of 2,217 bytes. STS-6 can be configured to fit a flexible amount of dynamic content within a template area while respecting that limit. For my posts list board, the number of posts shown is moderated by the size of the resulting board: STS-6 adds more and more links to the board until it’s too big, and then removes one!
It provides “hands-off” key management features. You can pregenerate a list of keys with different validity periods and the server will automatically cycle through them as necessary, implementing and retroactively-modifying <link rel="next"> connections to keep them current.

I’m sure that there are those who would see this as automating something that was beautiful because it was handcrafted; I don’t know whether or not I agree, but had Spring ’83 taken off in a bigger way, it would always only have been a matter of time before somebody tried my approach.

From a design perspective, I enjoyed optimising an SVG image of my header so it could meaningfully fit into the board. It’s pretty, and it’s tolerably lightweight.

If you want to see my server in action, patch this into your favourite Spring ’83 client: https://s83.danq.dev/10c3ff2e8336307b0ac7673b34737b242b80e8aa63ce4ccba182469ea83e0623

A dead end?

Without Robin’s active participation, I feel that Spring ’83 is probably coming to a dead end. It’s been a lot of fun to play with and I’d love to see what ideas the experience of it goes on to inspire next, but in its current form it’s one of those things that’s an interesting toy, but not something that’ll make serious waves.

In his last lab essay Robin already identified many of the key issues with the system (too complicated, no interpersonal-mentions, the challenge of keys-as-identifiers, etc.) and while they’re all solvable without breaking the underlying mechanisms (mentions might be handled by Webmention, perhaps, etc.), I understand the urge to take what was learned from this experiment and use it to help inform the decisions of the next one. Just as John Postel’s Quote of the Day protocol doesn’t see much use any more (although maybe if my finger server could support QotD?) but went on to inspire the direction of many subsequent “call-and-response” protocols, including HTTP, it’s okay if Spring ’83 disappears into obscurity, so long as we can learn what it did well and build upon that.

Meanwhile: if you’re looking for a hot new “like the web but lighter” protocol, you should probably check out Gemini. (Incidentally, you can find me at gemini://danq.me, but that’s something I’ll write about another day…)