ActivityPubサーバーを構築してみたいけれど、どこから始めればよいかわからない方には、Fedifyのチュートリアル『自分だけのフェディバースのマイクロブログを作ろう！』をおすすめします。包括的でステップバイステップのガイドで、完全に機能する連合型アプリケーションの構築方法を丁寧に解説しています。フェディバースに飛び込みたい開発者にぴったりです！

#ActivityPub #Fedify #チュートリアル #フェディバース #fediverse

If you're interested in building your own #ActivityPub server but don't know where to start, I recommend checking out #Fedify's #tutorial Creating your own federated microblog. It provides a comprehensive, step-by-step guide that walks you through building a fully functional federated application. Perfect for developers who want to dive into the #fediverse!

#fedidev

We're planning to reorganize our #GitHub labels to better reflect #Fedify's project structure! 🏷️

Currently using GitHub's default labels, but we want something more tailored to our needs—like component-specific labels (vocab, federation, actor, etc.), runtime tags (Deno/Node/Bun), and #ActivityPub compatibility tracking.

The proposal includes hierarchical labeling with categories like:

• type/ for bug, feature, documentation
• component/ for different parts of Fedify
• activitypub/ for interop issues with Mastodon, Misskey, etc.

We'd love your thoughts! What labels would be most helpful for contributors and maintainers?

Check out the full proposal: https://github.com/fedify-dev/fedify/issues/238.

#fedidev

While #Fedify's #Vocabulary API provides comprehensive support for #ActivityPub and major vendor extensions, its code-generation approach makes runtime extensions challenging. However, the project welcomes contributions to expand the supported types and properties.

Fedify accepts vocabulary contributions when they meet any of these criteria:

• Documented in FEP (Fediverse Enhancement Proposals) or equivalent specification
• Already adopted by widely-used #fediverse implementations like Mastodon or Pleroma
• Thoroughly discussed within the Fedify community (Discord, Matrix, GitHub Discussions)

Contributing new vocabulary is straightforward. The vocabulary definitions live in YAML files within the fedify/vocab/ directory. To add a new type, create a new .yaml file. To add properties to existing types, extend the properties section in the relevant .yaml file.

This approach ensures Fedify's vocabulary coverage grows with the fediverse ecosystem while maintaining type safety and comprehensive documentation. If you're working with custom ActivityPub extensions, consider contributing them upstream to benefit the entire community.

For detailed guidance on the contribution process, see the Extending the vocabulary section in Fedify's docs.

#fedidev

This patch for @vite is blocking #Fedify's Cloudflare Workers support. They say it'll be included in #Vite 7, but I can't wait that long, so I'm not sure what to do… 🤔

Occasionally I think the #Fedify project might need to leave #Deno. I'm even thinking that while adding Cloudflare Workers support… 🤔

I've been thinking about adding a debug dashboard to #Fedify that shows all #ActivityPub activities being sent and received in real-time. This would include filters by activity type, detailed inspection of JSON-LD content, signature verification details, and retry management for failed deliveries.

As a #fedidev, would you find this useful for troubleshooting federation issues? Any other features that would be helpful in such a debugging tool?

We've just submitted an #application to the Sovereign Tech Fund for the #Fedify project! Hoping to further develop and enhance the framework for a more robust federated web.

#STF #ActivityPub #fund

For those interested in supporting #Fedify's development, we do have an Open Collective page where community #sponsorship is welcome.

Even small contributions help sustain development and show there's interest in open source #ActivityPub tools. Thanks to our existing sponsors who've already been helping move the project forward!

The goal remains the same: make building federated applications more accessible to developers so the #fediverse can continue to grow and thrive.

Just received word that @fedify wasn't selected for @nlnet's Open Call this round. While disappointing, I understand the competition was fierce with many worthy projects seeking limited funding.

The journey continues though—#Fedify development will move forward at its own pace. Thanks to everyone who's shown interest and support for this project so far. Building tools for the #fediverse remains important work, and I'm committed to seeing it through.

If you know of other funding opportunities that might be a good fit for open source #ActivityPub tools, I'm all ears.

Good news! We've officially added #Cloudflare #Workers support to the #Fedify roadmap. We've created a detailed issue to track our implementation plan: https://github.com/fedify-dev/fedify/issues/233.

The effort will be tackled in phases, including compatibility assessment, core adaptations for Workers' environment, KV store and message queue implementations, and finally integration with Cloudflare's ecosystem. This will be a substantial project that we'll break down into several sub-issues.

If you're interested in contributing to any specific aspect of Workers support, please comment on the main issue to coordinate efforts.

#CloudflareWorkers

As #Fedify's author, I'm contemplating its adoption beyond Ghost's #ActivityPub implementation. Finding potential users for ActivityPub tools seems challenging—perhaps I'm addressing a very niche need?

While the technical complexity of ActivityPub makes tools like Fedify valuable, I wonder about the actual market demand for federation outside specific communities.

Open, decentralized systems make sense to many developers, but businesses often prefer closed ecosystems that align with traditional models.

Still, I see potential as the #fediverse grows and digital sovereignty concerns increase. Fedify aims to lower the technical barriers to federation.

I'm curious: Which projects would benefit most from Fedify today? What would make federation compelling enough for platforms to implement?

Would appreciate perspectives from both developers and platform owners.

Just wrote the Why Fedify? section in the #Fedify docs.

Okay, I've just deployed a bleeding edge #Fedify, which implements both RFC 9421 and double-knocking, to Hackers' Pub. If you'd like to test your implementations against a real server, please give it a try! (If you want to create an account, let me know—I can invite you.)

#fedidev #ActivityPub

Looking for #ActivityPub implementations with #RFC9421 support! 🔍

As mentioned in the Fedify announcement below, I've implemented RFC 9421 (HTTP Message Signatures) and need to verify its interoperability with other ActivityPub implementations.

The challenge is that most major ActivityPub projects don't seem to have full RFC 9421 implementations in production yet. If you're working on an ActivityPub project that:

• has implemented RFC 9421 (even in a development branch)
• is currently implementing it
• has plans to implement it soon

Please reach out! I'd love to collaborate on interoperability testing to ensure our implementations work properly with each other before merging this into #Fedify's main branch.

Any leads or connections would be greatly appreciated! 🙏

#fedidev

We're excited to announce that we've implemented RFC 9421 (HTTP Message Signatures) in #Fedify, complete with our double-knocking mechanism to maintain backward compatibility with the draft cavage version.

This implementation includes both signature generation and verification, meaning #RFC9421 is used when both sending and receiving activities. While we haven't merged the RFC 9421 implementation branch yet, we're currently conducting interoperability tests with development versions of Mastodon and other #ActivityPub implementations. Once these tests confirm compatibility, we'll proceed with the merge.

As noted in the attached docs, although RFC 9421 is the final and official standard for HTTP Signatures, the draft cavage version remains widely used across the #fediverse. Our double-knocking mechanism ensures maximum compatibility by trying the RFC 9421 version first, then falling back to draft cavage if needed.

Currently, we support RSA-PKCS#1-v1.5 key pairs for generating HTTP Message Signatures, with plans to expand to other signature types in future releases.

We look forward to contributing to a more standardized and secure fediverse!

#fedidev

We're pleased to announce that #Fedify has been included in the Nivenly Fediverse Security Fund program!

The @nivenly Foundation has launched a security bounty fund to support contributors who identify and help fix #security vulnerabilities in popular #fediverse software. Both Fedify and @hollo are among the selected projects that meet their responsible security disclosure requirements.

This program will run from April–September 2025, with bounties of $250–$500 USD for high and critical security vulnerabilities.

We're honored to be recognized alongside other established fediverse projects like Mastodon, Misskey, and Lemmy. This further encourages our commitment to maintaining strong security practices.

If you're interested in contributing to Fedify's security, please follow our responsible disclosure process outlined in our SECURITY.md file.

Learn more about the program:

https://nivenly.org/blog/2025/04/01/nivenly-fediverse-security-fund/

素晴らしい :clapping:

新しい分散/連合型SNS「Pulsate」を開発している - /dev/sdR2 https://laminne.hatenablog.jp/entry/2025/01/17/190000

#Fediverse #Hono #Fedify

What to learn more about the #fediverse and #ActivityPub? This tutorial (https://fedify.dev/tutorial/microblog) from @fedify is a really good starter. It explains how to implement a really simple #federated server and see how communication exchange are done with AP.

#tutorial #activitypubdev #fedify #typescript #library

Creating your own federated microblog | Hacker News

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