Waves image check: ingest type, promoted filter and verdict lookup

[feruzm]

Closes #112

Three small pieces for the waves image check, all on the gateway side.

What changes

1. Ingest type. wave_nsfw joins the event types the curation desk ingest route forwards. Without it the gateway answers 400 and the sender drops the event as permanent. The payload is forwarded untouched, as for the other types.
2. Promoted entries. They are served from here, not from the waves indexer, so a wave the indexer leaves out of every shared feed could still be bought into a promoted slot. The promoted list is now filtered by the indexer's verdicts, right after the moderation mute filter and for the same reason. Clients cannot do this themselves: a promoted entry comes from the chain and carries no verdict.
3. Lookup route. GET /private-api/waves/nsfw?author=&permlink= answers the indexer's {"flagged": [...]}. It is for the wave page opened by a link, which loads the wave from the chain and has no feed row to read the verdict from.

Behaviour of the filter

• one lookup per distinct promoted list, cached 60 seconds; lists longer than 100 entries are checked in chunks, in full
• fails open: an unreachable indexer, a non-200 or an unusable body is a failure, not an empty verdict. The filter then uses the last good answer and holds the failure for 30 seconds, so a dead indexer is not asked on every request
• an entry whose author or permlink cannot be read is kept
• 2 second timeout, no logging on the request path

Tested

• 14 new tests in WaveNsfwTests, plus a theory over all five ingest types
• mutation checked: ignoring the status, dropping the fallback and the failure cache, checking only the first chunk, and keeping flagged entries each fail a test
• full suite: 622 passed

Deploy

Merging to main deploys. It is safe before the indexer change ships: the lookup then fails, the filter fails open, and the route answers the indexer's 404.

Summary by CodeRabbit

• New Features
  • Promoted waves now exclude entries flagged by the image safety check.
  • Added a private API lookup for checking whether a wave has been flagged.
  • Image-check events can now be included in curation data.
• Reliability
  • When image-check lookups fail, the service reuses the most recent successful results when available. Entries without usable lookup details remain visible.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-12T21:42:23.998621Z	f9b5cfa	PR opened

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Review configuration:

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 5c9c8c9a-bf8e-4385-9da6-4ab8481de3bd

📥 Commits

Reviewing files that changed from the base of the PR and between 9c09497 and 978d779.

📒 Files selected for processing (1)

• dotnet/EcencyApi.Tests/WaveNsfwTests.cs

📝 Walkthrough

The API now retrieves wave image-check verdicts, filters flagged waves from promoted entries, and exposes a verdict endpoint. The curation desk ingest handler also accepts the wave_nsfw event type.

Changes: Wave NSFW filtering

Layer / File(s)	Summary
Verdict lookup and filtering dotnet/EcencyApi/Infrastructure/WaveNsfw.cs, dotnet/EcencyApi.Tests/WaveNsfwTests.cs	WaveNsfw extracts keys, queries verdicts in batches, caches results, and filters flagged entries. Tests cover key handling, response parsing, caching, fallback, batching, and filtering.
Feed and endpoint integration dotnet/EcencyApi/Handlers/PrivateApi.Feeds.cs, dotnet/EcencyApi/Handlers/Routes.cs	Promoted entries are filtered for flagged waves after muted authors are removed. The new GET /private-api/waves/nsfw endpoint validates its query values and pipes the upstream response.

Curation desk ingest event support

Layer / File(s)	Summary
Allowlist and payload test dotnet/EcencyApi/Handlers/PrivateApi.CurationDesk.cs, dotnet/EcencyApi.Tests/CurationDeskPayloadTests.cs	CurationDeskWrites.IngestTypes now includes wave_nsfw. A theory test checks that all five event types are accepted and preserve the nested over value.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant PrivateApi
  participant WaveNsfw
  participant Indexer
  PrivateApi->>WaveNsfw: Get flagged verdicts for promoted entries
  WaveNsfw->>Indexer: Request verdicts in batches
  Indexer-->>WaveNsfw: Return flagged keys
  WaveNsfw-->>PrivateApi: Return flagged keys
  PrivateApi->>PrivateApi: Filter flagged entries

Loading

Merge Risk: 🟡 Moderate · up to 9c094

Filtering flagged waves can alter the cached promoted list, causing later requests to receive an incomplete list. Preserve the cached list before merging.

Pre-merge checks · 3 · 2

Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Out of Scope Changes check		Issue #112 states that no other change is requested. The pull request also adds promoted-entry filtering in PromotedEntries, the GET /private-api/waves/nsfw handler, its route, and WaveNsfw look…	Remove the promoted-entry filtering, lookup route, route registration, WaveNsfw infrastructure, and related tests from this pull request, or link those changes to a directly relevant active issue and split them into a separate pull reques…
Docstring Coverage		Docstring coverage is 23.53% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 34 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks (3 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly summarizes the main changes: adding the wave image-check ingest type, filtering promoted entries, and adding verdict lookup support.
Linked Issues check		Issue #112 requires the ingest route to accept wave_nsfw with the four existing event types and preserve its payload. The change adds wave_nsfw to CurationDeskWrites.IngestTypes. The added theor…

Full details: Out of Scope Changes check

Explanation

Issue #112 states that no other change is requested. The pull request also adds promoted-entry filtering in PromotedEntries, the GET /private-api/waves/nsfw handler, its route, and WaveNsfw lookup and caching infrastructure. These changes are separate from ingest forwarding and are not required by issue #112.

Resolution

Remove the promoted-entry filtering, lookup route, route registration, WaveNsfw infrastructure, and related tests from this pull request, or link those changes to a directly relevant active issue and split them into a separate pull request.

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_{A rabbit checks each wave at night,
And marks the flagged images right.
The feed lets clear waves journey through,
While ingest sends the verdict too.
Five event types now pass in view.}

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Actionable comments posted: 1

🔇 Additional comments (3)

dotnet/EcencyApi.Tests/WaveNsfwTests.cs (1)

1-187: LGTM!

dotnet/EcencyApi/Handlers/Routes.cs (1)

69-69: LGTM!

dotnet/EcencyApi/Handlers/PrivateApi.Feeds.cs-190-190 (1)

190-190: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

⚠️ Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.

Lowercase the author the same way WaveNsfw.Key does.

The promoted-entries path asks the indexer with author.ToLowerInvariant() + "/" + permlink. This endpoint sends the author unchanged. If a link has a mixed-case author (for example @Alice), the indexer gets a key that does not match its lowercase keys. The endpoint then reports the wave as not flagged.

Proposed fix

-        var u = WaveNsfw.Endpoint(new[] { author[0]!.TrimStart('@') + "/" + permlink[0] });
+        var u = WaveNsfw.Endpoint(new[] { author[0]!.TrimStart('@').ToLowerInvariant() + "/" + permlink[0] });

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Inline comments:
Review comments at @dotnet/EcencyApi/Infrastructure/WaveNsfw.cs:
- Around line 179-181: Update the kept-entry handling in the WaveNsfw filtering
flow: avoid removing entries from their parent array, and add a clone of each
kept entry instead so the source JsonArray remains unchanged.

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📥 Commits

Reviewing files that changed from the base of the PR and between f9b5cfa and 9c09497.

📒 Files selected for processing (4)

• dotnet/EcencyApi.Tests/WaveNsfwTests.cs
• dotnet/EcencyApi/Handlers/PrivateApi.Feeds.cs
• dotnet/EcencyApi/Handlers/Routes.cs
• dotnet/EcencyApi/Infrastructure/WaveNsfw.cs

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