Use nodeinfo_discovery hook instead of deprecated wellknown_nodeinfo_data

[pfefferle]

Proposed changes:

The standalone NodeInfo plugin deprecated its wellknown_nodeinfo_data filter in v3.0.0 in favor of nodeinfo_discovery. Our NodeInfo integration still registered its callback on the old hook name, so on sites running NodeInfo 3.x a PHP deprecation notice was logged on every /.well-known/nodeinfo discovery request:

PHP Deprecated: The hook wellknown_nodeinfo_data is deprecated since version 3.0.0! Use nodeinfo_discovery instead.

• Switch the add_filter() registration in integration/class-nodeinfo.php from wellknown_nodeinfo_data to nodeinfo_discovery. The new hook passes the same array( 'links' => … ) discovery document, so the callback that appends the Application link is unchanged.
• Update the integration tests to assert on the new hook name.

Because nothing in the plugin hooks wellknown_nodeinfo_data anymore, NodeInfo's backwards-compat shim short-circuits (has_filter() is false) and the notice stops.

Note: sites still running NodeInfo < 3.0.0 (which predates nodeinfo_discovery) will no longer have the Application link added to their discovery document. NodeInfo 3.0.0 has been available for a while, so this is considered acceptable.

Other information:

• Have you written new tests for your changes, if applicable?

Updated the existing Test_Nodeinfo integration tests (20 tests, 99 assertions, all passing) to cover the new hook.

Testing instructions:

1. Install and activate both the ActivityPub plugin and the NodeInfo plugin (v3.0.0 or later).
2. Enable WP_DEBUG and WP_DEBUG_LOG.
3. Request /.well-known/nodeinfo (or /wp-json/... discovery), e.g. curl https://example.com/.well-known/nodeinfo.
4. Before this change, wp-content/debug.log shows a wellknown_nodeinfo_data is deprecated notice for each request. After this change, no such notice appears.
5. Confirm the discovery document still contains the ActivityPub Application link (rel https://www.w3.org/ns/activitystreams#Application).

Changelog entry

A changelog entry is included at .github/changelog/fix-nodeinfo-discovery-deprecation.

[Copilot]

Pull request overview

Updates the ActivityPub plugin’s NodeInfo integration to avoid triggering a deprecation notice in NodeInfo plugin v3.x by registering on the replacement discovery hook.

Changes:

• Switch the NodeInfo discovery filter registration from the deprecated wellknown_nodeinfo_data hook to nodeinfo_discovery.
• Update integration tests to assert the new hook is registered and exercised.
• Add a changelogger entry documenting the deprecation-notice fix.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
integration/class-nodeinfo.php	Registers the integration callback on nodeinfo_discovery instead of the deprecated hook.
tests/phpunit/tests/integration/class-test-nodeinfo.php	Updates hook registration assertions and integration hook test to use nodeinfo_discovery.
.github/changelog/fix-nodeinfo-discovery-deprecation	Documents the fix for deprecation notices when NodeInfo is active.