I have started work on a Mastodon-compatible API layer intended to support the many Mastodon front-ends available. It is incomplete and requires an explicit build flag to enable, but what's there (the main timeline) already works with the official Mastodon app, Tusky, and Phanpy.

Here's the full changelog:

Fixed

• Editor focus now stays in the editor after the first draft is saved. (fixes #139)
• Filter settings instructions. (fixes #135)

Changed

• Improved consistency of mini button colors.

As always, check out the full diff for the complete details.

#ktistec #crystallang #activitypub #fediverse

This small release focused on two big deliverables: support for the latest version of Crystal and fixes for a few delivery issues.

Previous releases supported a wide range of Crystal Language versions, but ran into problems with version 1.17.x and beyond due to breaking changes in the standard library. This release works on 1.19.1 but also requires at least 1.19.1.

This release also fixes a bug, present since mid-2020 when HTTP signatures were first added, that resulted in signatures some fediverse servers wouldn't accept. Mastodon did, but with the proliferation of new ActivityPub servers, I increasingly encountered servers that did not.

Here's the full changelog:

Fixed

• HTTP signature keyId now includes #main-key fragment.
• IRI matching during dereferencing.
• Broken down-detection for actors.

Changed

• Fall back to Activity Streams context if supplied context is empty.
• Deliver to personal inbox if delivery to shared inbox fails.

It's always good to stay up-to-date on releases. But if your platform doesn't yet support 1.19.1, I've also released a parallel branch that still runs on 1.16.3 and earlier. I'll maintain that branch for the next few releases to give everyone time to upgrade.

#ktistec #crystallang #activitypub #fediverse

I think I’m going to work on a Mastodon-compatible API next. I did all the hard work figuring out what I need to change months ago so this should be smooth. I’m happy with the existing #ktistec UI but there is a lot of interesting work on the client side that I’d like to sample.

FWIW, I’m not opposed to C2S—Ktistec comes with a lot of the necessary abstractions. But I feel like my users, myself included, will get more bang out a Mastodon-compatible API. (But change my mind!)

The latest release of Ktistec addresses the shortcomings of the previous release that became apparent after using quote posts in production for a few days. So far, there have been no major bugs, but there was room for improvement.

Here's the full changelog.

Added

• Federation documentation (FEDERATION.md).
• Visibility (private or direct) icon in object summary.
• Object social activity details include dislikes.
• "quotes-me" theming class for objects.
• Notification for quote posts.
• MCP integration for quote posts.

Changed

• Renamed NodeInfo siteName to more standard nodeName.
• Increased hard-coded limits for actor attachments and pinned collections.

Fixed

• Displaying quoted posts in draft view.
• Visual indication of nested quotes in object view.

I added a FEDERATION.md document to the project. This is documentation required by FEP-67ff on "information necessary for achieving interoperability with a federated service". The document describes, at a high level, what federation protocols and standards Ktistec currently supports.

#ktistec #crystallang #activitypub #fediverse

working on writing FEDERATION.md i already found one easily fixable deviation (siteName instead of nodeName in nodeinfo).

#ktistec #ActivityPub #Fediverse

Before creating and publishing FEDERATION.md for #ktistec I wanted to understand what existing practice looked like across the Fediverse.

FEP-67ff describes the requirements of the FEDERATION.md file in loose terms and provides a non-normative template. I scraped the URLs of FEDERATION.md files from FEP-67ff itself and confirmed I could fetch them. The FEP listed 30 accessible projects (31 total, but one project—FIRM—does not appear to exist).

If a file had a section with the heading "Supported FEPs" per the non-normative template, I only looked there for supported FEPs. Otherwise I scanned the entire document.

Implemented FEPs, ranked by the number of implementations that attest support, are:

FEP   Name                                                        #
----  ---------------------------------------------------------  --
67ff  FEDERATION.md                                              18
f1d5  NodeInfo in Fediverse Software                             16
8b32  Object Integrity Proofs                                     7
044f  Consent-respecting quote posts                              7
2677  Identifying the Application Actor                           7
e232  Object Links                                                6
1b12  Group federation                                            6
3b86  Activity Intents                                            6
521a  Representing actor's public keys                            5
2c59  Discovery of a Webfinger address from an ActivityPub actor  5
7888  Demystifying the context property                           5
5feb  Search indexing consent for actors                          5
4adb  Dereferencing identifiers with webfinger                    4
d556  Server-Level Actor Discovery Using WebFinger                4
fb2a  Actor metadata                                              4
ef61  Portable Objects                                            4
8fcf  Followers collection synchronization across servers         4
844e  Capability discovery                                        4
7628  Move actor                                                  3
61cf  The OpenWebAuth Protocol                                    3
c390  Identity Proofs                                             3
400e  Publicly-appendable ActivityPub collections                 3
c0e0  Emoji reactions                                             3
0151  NodeInfo in Fediverse Software (2025 edition)               3
fffd  Proxy Objects                                               2
f228  Backfilling conversations                                   2
fe34  Origin-based security model                                 2
eb48  Hashtags                                                    2
171b  Conversation Containers                                     2
a5c5  Web Syndication Methods                                     2

There are obvious flaws in the methodology. Or maybe in the data. Only 18 out of the 30 projects I could access had a FEDERATION.md that attested FEDERATION.md support. Only 19 mentioned "FEDERATION.md". Only 21 mentioned "67ff". The remaining projects clearly did support FEP-67ff—the file itself was evidence. (FEDERATION.md is not meant to be machine readable—there's an issue about that).

It was more difficult to rank implemented federation protocols. I extracted keywords from documents with a  "Supported federation protocols and standards" section and created a dictionary of terms. If a file had a section with the heading "Supported federation protocols and standards", I only looked there. Otherwise I scanned the entire document.

Feature            #
----------------  --
activitypub       26
webfinger         24
http_signatures   21
nodeinfo          19
json_ld            2
ld_signatures      2
ostatus            2
authorized_fetch   1
atproto            1

If time allows, I'm going to try to rank these documents by "utility", though I haven't yet determined the exact metric. These documents clearly provide valuable information, but their lack of standardization makes them harder to analyze systematically.

#ActivityPub #Fediverse #Fep67ff #fep

Release v3.3.0 of Ktistec adds support for consent-respecting quote posts (FEP-044f). Quote posts represent the most lines of code I've written for any single changelog entry in my life.

Added

• Support for consent-respecting quote posts (FEP-044f).

Changed

• next_attempt_at in tasks now means not scheduled when nil.
• Permit type changes for ActivityPub objects.

Important: Quote posts come with a few big caveats. I've been using iterations of this in production for weeks, but if you don't like what you read below you might want to wait for the patch release.

• FEP-044f quote posts require delicate choreography between quoted and quoting servers. Server support across the fediverse is incomplete and evolving. If a quote post doesn't display it might be my bug, it might be their bug. Expect bugs.
• Quote authorization is currently all or nothing—you either blanket reject quote post requests (the default) or blanket accept them. I intend to support more granular controls and manual approval but that comes later.
• Quote authorization revocation isn't supported.
• Automatic re-verification of quote authorization isn't supported.
• Compatibility with other quote implementations is incomplete.
• There will be bugs 🐞 and more bugs 🐜.

#ktistec #crystallang #activitypub #fediverse

still working on quote posts... getting close...

as an aside, #ktistec x-ray mode is really useful when debugging and when i want to navigate to a quoted post that hasn't yet been remotely approved!

i think i'm going to add a feature to #ktistec that rolls up a chain of self-replies into a single post that i can just read. i don't understand why that (mis)feature of twitter remains so popular on the #fediverse