Fetch feed own capabilities on activity added

[gpunto]

Goal

AND-818

Backend sends empty own_capabilities in the feed in activities on the activity added event (like for other "own" properties). So they added an endpoint to fetch them if we don't have them cached locally (e.g. we can cache them if feed.getOrCreate() was called because they're returned there).

Implementation

• Create FeedsCapabilityRepository to handle caching and fetching capabilities
• Create StateEventEnricher to use the repository's getOrRequest to enrich ActivityAdded or request capabilities to be fetched
• Add FeedCapabilitiesUpdated state event to notify on capabilities cached & handle it where needed (i.e. where we also handle ActivityAdded)
• Change ActivityData.update to preserve feed capabilities like other own properties

Testing

Checklist

• Issue linked (if any)
• Tests/docs updated
• I have signed the Stream CLA (required for external contributors)

[github-actions]

PR checklist ✅

All required conditions are satisfied:

• Title length is OK (or ignored by label).
• At least one pr: label exists.
• Sections ### Goal, ### Implementation, and ### Testing are filled.

🎉 Great job! This PR is ready for review.

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-feeds-android-client	2.36 MB	2.37 MB	0.01 MB	🟢

[Copilot]

Pull request overview

This PR implements fetching feed own capabilities on ActivityAdded events when the capabilities aren't already cached. The backend sends empty own_capabilities in activities from WebSocket events, so this change introduces a batched API endpoint to fetch them on-demand when needed.

Key Changes:

• Introduced FeedsCapabilityRepository with batching and caching to efficiently fetch and store feed capabilities
• Created StateEventEnricher to enrich ActivityAdded events with cached capabilities or trigger fetch requests
• Added FeedCapabilitiesUpdated state event to propagate capability updates across the system
• Extended ActivityData.update() to preserve feed capabilities like other "own" properties (bookmarks, reactions, poll votes)

Reviewed changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
FeedsCapabilityRepository.kt	New repository implementing batched fetching, caching, and distribution of feed capabilities with exponential retry logic
StateEventEnricher.kt	New enricher that intercepts ActivityAdded events to populate capabilities from cache or trigger fetch requests
StateUpdateEvent.kt	Added FeedCapabilitiesUpdated event to notify listeners when capabilities are cached
FeedEventHandler.kt	Added handler for FeedCapabilitiesUpdated events in feed state
ActivityListEventHandler.kt	Added handler for FeedCapabilitiesUpdated events in activity list state
FeedStateImpl.kt	Implemented onFeedCapabilitiesUpdated() to update capabilities in activities matching the updated feed IDs
ActivityListStateImpl.kt	Implemented onFeedCapabilitiesUpdated() to update capabilities in activities with matching feeds
FeedListImpl.kt	Added capability caching when querying feeds
FeedImpl.kt	Added capability caching on feed getOrCreate
ActivityListImpl.kt	Added capability caching when querying activities
ActivityImpl.kt	Added capability caching when fetching individual activities
ActivityOperations.kt	Extended ActivityData.update() to preserve currentFeed capabilities; added updateFeedCapabilities() helper
FeedsClientImpl.kt	Integrated StateEventEnricher into event processing pipeline; added repository and enricher dependencies
Create.kt	Instantiated FeedsCapabilityRepository with batcher and StateEventEnricher; refactored subscription manager creation
*Test.kt files	Comprehensive test coverage for new repository, enricher, event handlers, and state updates

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[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
87.7% Coverage on New Code
0.1% Duplication on New Code

See analysis details on SonarQube Cloud