feat: add custom link to WebFinger's Links fields.

[dodok8]

Summary

Added setWebFingerLinksDispatcher(dispatcher) to set additional links to Links of Webfinger.

Related Issue

• closes Webfinger in Fedify should support Mastodon's special rel= 'http://ostatus.org/schema/1.0/subscribe' and template #119

Changes

• Added WebFingerLinksDispatcher support to the federation builder pattern.
• Integrated WebFingerLinksDispatcher into the WebFinger request handling flow.
• Updated middleware to support the new dispatcher
• Added Test
• Extended MockFederation to support WebFingerLinksDispatcher testing

Benefits

• Applications can now customize WebFinger responses with dynamic links

Checklist

• Did you add a changelog entry to the CHANGES.md?
• Did you write some relevant docs about this change (if it's a new feature)?
• Did you write a regression test to reproduce the bug (if it's a bug fix)?
• Did you write some tests for this change (if it's a new feature)?
• Did you run deno task test-all on your machine?

Additional Notes

Currently, I am working on writing docs. However, unlike NodeInfo, context about WebFinger is split, so I tried to collect it into one chapter first.

[gemini-code-assist]

Summary of Changes

Hello @dodok8, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new mechanism to allow applications to dynamically add custom links to WebFinger responses. This enhances the flexibility of WebFinger by enabling the inclusion of application-specific or dynamic information within the Links field, ensuring that federated applications can provide richer and more tailored responses.

Highlights

• Custom WebFinger Links: Implemented a WebFingerLinkDispatcher to allow dynamic addition of custom links to WebFinger responses, enhancing the flexibility of the protocol.
• Federation Builder Integration: The new dispatcher is integrated into the FederationBuilder pattern, providing a setWebFingerLinkDispatcher method for easy configuration by applications.
• Middleware Support: The WebFinger handling middleware has been updated to utilize the new dispatcher, ensuring that custom links are correctly included in the final WebFinger response.
• Enhanced Test Coverage: New test cases have been added to validate the functionality of the WebFingerLinkDispatcher, and the MockFederation utility has been extended to support comprehensive testing of this feature.

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[github-actions]

The docs for this pull request have been published:

https://aa53c65b.fedify.pages.dev

[github-actions]

The latest push to this pull request has been published to JSR and npm as a pre-release:

Package	Version	JSR	npm
@fedify/fedify	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/cli	1.9.0-pr.407.1544+f591def8	JSR
@fedify/amqp	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/cfworkers	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/denokv	1.9.0-pr.407.1544+f591def8	JSR
@fedify/elysia	1.9.0-pr.407.1544+f591def8		npm
@fedify/express	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/h3	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/hono	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/nestjs	1.9.0-pr.407.1544+f591def8		npm
@fedify/next	1.9.0-pr.407.1544+f591def8		npm
@fedify/postgres	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/redis	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/sqlite	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/sveltekit	1.9.0-pr.407.1544+f591def8	JSR	npm
@fedify/testing	1.9.0-pr.407.1544+f591def8	JSR	npm