Julian Fietkau

Human-computer interaction, computer science & programming, home server & self-hosting, games and other fun stuff.

He/him. Posting mostly in English, but you might see the occasional German boost.

Public Key

npub1ptypvw47snpsu9k3mhs99u09wulfvtxzyywkkhwqdertkwat428s7m9ra6

NIP-05 Address

julian_at_fietkau.social@mostr.pub

Profile Code

nprofile1qqsq4jqk82lgfscwzmgamczj78jhw05k9npzz8ttthqxu34m8w464rcpz4mhxue69uhhyetvv9ujumt0wd68ytnsw43qz9nhwden5te0wfjkccte9ehx7um5wghxyctwvse6f246

Publishing to

relay.mostr.pub

relay.nostr.band

nostr21.com

Author Public Key

npub1ptypvw47snpsu9k3mhs99u09wulfvtxzyywkkhwqdertkwat428s7m9ra6

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Last Notes

2024-10-25 22:36:11

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@npub1dlm…acly Oh my, do I have some timely good news for you. 😄 https://github.com/mastodon/mastodon/pull/32615

2024-07-29 23:57:26

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@npub1j46…3gm7 Thank you, I'll come back here and share when the slides are finished and public!

2024-07-29 23:57:26

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@npub1j46…3gm7 Thank you, I'll come back here and share when the slides are finished and public!

2024-07-20 10:17:35

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@npub1k08…6xvn I haven't looked into OS support for it, but I've got an unused LG G8s ThinQ with a slightly bulged battery. Should be shippable without danger. Would that be helpful?

2024-07-03 16:53:07

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@npub15cd…3mv2 Hey David, that's a very lovely comic and I am so sorry for what I'm about to say... but panel 1 looks like Cookie Monster. 😮

2024-06-10 20:05:43

Should #Shadertoy have #ActivityPub / #Fediverse support? 🤔
https://www.shadertoy.com
I have an account there, containing a dodgy old raytracing experiment. But I like looking at other people's stuff.
The site already has profiles, posts, likes, follow mechanics.
It's fun to think about how one would federate Shadertoy posts. HTML iframe with a fallback animated GIF somehow?
The site lets high-tier Patreon supporters make feature suggestions. Any Shadertoy enthusiasts interested in asking?

2024-04-01 14:42:46

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@npub19lt…qfjk It's rather recent: https://scicomm.xyz/@ORCID_Org/112173667546022963

2024-03-17 20:59:44

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@npub19lt…qfjk Okay, but Mastodon's signatures don't have a "created" signature parameter, right? I don't remember ever seeing one. Is this one of those things where Mastodon's signatures differ from the RFC?
Looking at your code now, I see you're checking both differences: between signature date and current local time, as well as between signature date and "published" property. I think the latter will keep causing problems. Multi-hour differences are not especially rare in my experience.

2024-03-17 20:44:01

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@npub19lt…qfjk Wait, you're comparing the Date header to the activity's "published" property? Is that recommended? I don't think there are restrictions on that duration, I've received hours old messages from congested servers.
What I compare (and what I believe Mastodon compares) is the difference between the signed message's Date header and my own server's time. The goal is to ensure the signature itself is current. There's less room for valid time differences there.

2024-03-05 14:21:18

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@npub19lt…qfjk AIUI, the standard says you need to specify the exact object you want to Undo, via its ID.
For @npub1djm…vj82 I initially followed this requirement, but quickly ran into ambiguities (like when a client sends two Follows with different IDs, which one do I keep and what should happen if they later Undo the other one). I changed it to be like "if I get a signed Undo<Follow> from an Actor, they probably mean to Undo whatever Follow I have." 🤷
I.e. maybe the implementation will be nice to you.

2024-03-05 13:01:22

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@npub16u7…uend Great read, thank you!
Hey @npub1z64…sxul, has this crossed your feed? I know you've been arguing about this topic with people a lot lately, and this seems like a good summary for those with an open mind.

2024-02-18 13:38:49

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@npub19lt…qfjk Then I'll make it short: The assumption that a server has a shared inbox at /inbox does not generalize, as even the existence of a shared inbox is not mandated by anything.
What you'd need to do is when someone follows, you fetch their actor data and store at minimum their inbox and/or shared inbox.
For sending, I build a set of all shared inboxes that occur more than once, and use the individual inboxes for the rest.

2024-02-18 13:35:08

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@npub19lt…qfjk Nice work! It looks similar to my own self-study one-file ActivityPub server in Python. I think the structure of the protocols lends itself to implementing single-actor servers as a learning experience.
I know you're saying it's quick & dirty in some ways, but if it's intended as a learning tool for others, do you want feedback on it? There's one bad assumption in there that I think would be better if it was cleaned up.

2024-02-11 10:00:19

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@npub1g57…y839 I don't know if anyone has made something for just images, but you should look at FediWall, maybe the code will be easy to adapt.

2023-11-02 02:34:43

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@npub10r2…w6yx Almost more interestingly, what does it do if you hotpatch it to remove the conversion and upload the PNG instead? Are you willing to try? Is the size limit enforced client side as well? 🙃

2023-10-28 09:40:35

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@npub10r2…w6yx Nice work! 👍 I looked at Skyview to learn how you access Bluesky posts.
Not sure if you already saw, but I've been active as well and made this last weekend: https://fietkau.software/pinhole Since we briefly talked about the possible implications of something like this, I figure you might be interested in learning that I published it. Don't know for sure if anyone else is using it yet.

2023-10-22 19:25:10

For this weekend's coding project, I built a tiny single-user Bluesky→ActivityPub one-way bridge I named “Pinhole”. If there's someone on Bluesky whose posts you want in your Mastodon feed, you can download and run it yourself: :fietkau_software: https://fietkau.software/pinhole
Caveats: 1. I intentionally built it anti-scalable: you can use it to follow one Bluesky account from one fedi account, and that's it. 2. You need experience with web servers.
#fediverse #ActivityPub #MastoDev #Bluesky #atproto
https://fietkau.social/system/media_attachments/files/111/280/260/116/129/032/original/e306cf887b126747.png

2023-10-19 11:22:50

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@npub10r2…w6yx I figured you might say that. The old birdsite.live could be configured to allowlist accounts on both sides for personal deployments to prevent flooding (have a small number of mirror bots only followable by you), but of course if the code is open someone will immediately host a free-for-all version...

2023-10-19 11:07:14

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@npub10r2…w6yx Showerthought: How hard would it be to adapt and graft your code onto https://bird.makeup to provide an ActivityPub actor per Bluesky profile? Being able to follow Bluesky accounts here on Mastodon, even if it's read-only for the time being, could be pretty neat.
Showerthought 2: bird.makeup has gotten a lot of criticism for "littering" the fediverse with bot accounts, plus it's kind of a legal (and arguably ethical) disaster. Are people more gun-shy about projects like that now?

2023-08-15 20:08:58

PSA: I've been working on a small new web app to host an opt-in public list of #HCI researcher accounts on the fediverse. I got together with the https://hci.social team and set it up here: https://directory.hci.social
Please check it out and, if you do #HCI, #CSCW or anything along those lines, you're invited to add yourself! 😀 And to follow @npub1hy0…eklj too.
It's the first public stress test and I kinda expect some breakage. Please contact me if anything doesn't work like it should!

2023-07-17 19:00:10

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@npub1svm…hfej I like it! Are the color palettes hand-picked or do you generate them as well?

2023-07-09 16:49:04

LB: Cory Doctorow @npub1hyk…3p33 saves me the trouble of having to write a follow-up blog post for my fediverse opinion piece by expressing what I think and more, better than I ever could have. Heavily recommended reading for anyone with opinions on social media. https://doctorow.medium.com/let-the-platforms-burn-6fb3e6c0d980

2023-06-23 13:51:04

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@npub1znz…8l64 Will we be able to warp out of bounds and explore the glitch landscapes that result from unrelated data in memory being interpreted as level tiles?
I figure the answer is no but it can't hurt to ask. 😄
(My nostalgic favorite for this is Pokémon Gen 1, but Anodyne did a great job simulating the effect as an easter egg.)