Add Swagger/OpenAPI 3.0 docs and interactive Swagger UI for Thomas REST API

[Copilot]

Thomas has no machine-readable API contract or interactive docs for its HTTP layer. This adds a static OpenAPI 3.0 spec and a CDN-backed Swagger UI served directly from the existing http4s server—no tapir or rho required.

Changes

• http4s/src/main/resources/swagger/openapi.yaml — Full OpenAPI 3.0 spec covering all public endpoints (/users/groups/query, /health, /tests/*, /features/*) and internal management endpoints (/internal/tests CRUD), with complete schema definitions for UserGroupQuery, AbtestSpec, UserGroupQueryResult, EntityAbtest, Group, etc.

• http4s/src/main/scala/com/iheart/thomas/http4s/SwaggerUIRoutes.scala — New HttpRoutes serving two endpoints:

  • GET /swagger/openapi.yaml — spec loaded from classpath, served as text/yaml
  • GET /swagger-ui — Swagger UI HTML loading assets from unpkg CDN, pinned to v5.17.14 with SRI integrity hashes on both <link> and <script> tags; includes a null-guard on the classpath resource load

• http4s/src/main/scala/com/iheart/thomas/http4s/AdminUI.scala — Prepends SwaggerUIRoutes to the top-level route composition; requires only the existing MonadThrow[F] bound already on AdminUI.

• README.md — Documents access URLs (/swagger-ui, /swagger/openapi.yaml).

Route wiring

// AdminUI.scala
private val swaggerRoutes = new SwaggerUIRoutes[F].routes

def routes(builder: WebSocketBuilder2[F]) =
  swaggerRoutes <+> authUI.publicEndpoints <+> liftService(...)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• repo.scala-sbt.org
  • Triggering command: /usr/bin/java java -Dfile.encoding=UTF8 -Xms1G -Xmx6G -XX:MaxMetaspaceSize=2G -XX:ReservedCodeCacheSize=250M -XX:+TieredCompilation -XX:-UseGCOverheadLimit -Dsbt.script=/tmp/sbt/bin/sbt -Dscala.ext.dirs=/home/REDACTED/.sbt/1.0/java9-rt-ext-eclipse_adoptium_17_0_18 -jar /tmp/sbt/bin/sbt-launch.jar http4s/compile (dns block)
• repo.typesafe.com
  • Triggering command: /usr/bin/java java -Dfile.encoding=UTF8 -Xms1G -Xmx6G -XX:MaxMetaspaceSize=2G -XX:ReservedCodeCacheSize=250M -XX:+TieredCompilation -XX:-UseGCOverheadLimit -Dsbt.script=/tmp/sbt/bin/sbt -Dscala.ext.dirs=/home/REDACTED/.sbt/1.0/java9-rt-ext-eclipse_adoptium_17_0_18 -jar /tmp/sbt/bin/sbt-launch.jar http4s/compile (dns block)
• unpkg.com
  • Triggering command: /usr/bin/curl curl -sI REDACTED (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Overview

Add Swagger/OpenAPI 3.0 documentation for the Thomas A/B testing REST API. The project uses http4s for its HTTP layer (see http4s/ module). The goal is to produce interactive Swagger UI docs and a machine-readable openapi.yaml / openapi.json spec that describes all public and internal HTTP endpoints.

---

Approach

Use tapir with the http4s integration (tapir-http4s-server) and the OpenAPI docs integration (tapir-openapi-docs, tapir-swagger-ui-bundle) to describe existing endpoints and serve Swagger UI.

Alternatively, if tapir is too invasive, use rho or simply write a static openapi.yaml file and serve it alongside the Swagger UI static assets. A static OpenAPI YAML approach is the least-invasive option.

---

Endpoints to Document

The following REST endpoints are defined in the codebase:

Public Endpoints (AbtestService)

Method	Path	Description
POST	/users/groups/query	Get group assignments for a user given a UserGroupQuery
GET	/health	Health check, returns {"status":"healthy","version":"..."}
GET	/tests/history/{at}	Get all tests as of epoch seconds at
GET	/tests/{endAfter}	Get all tests ending after epoch endAfter
GET	/tests	Get all tests, optional at (epoch ms) and endAfter query params
GET	/testsWithFeatures	Get cached tests with features, optional at query param
GET	/testsData	Get tests data for a time window (atEpochMilli, durationMillisecond)
GET	/tests/{testId}	Get a single test by ID
GET	/tests/cache	Get cached tests, optional at query param
GET	/features	Get all feature names
GET	/features/{feature}/tests	Get tests for a feature
GET	/features/{feature}/overrides	Get overrides for a feature

Internal / Management Endpoints (AbtestManagementService, auth-protected)

Method	Path	Description
POST	/internal/tests	Create a new A/B test (AbtestSpec), optional ?auto=true
POST	/internal/tests/auto	Create a new A/B test with auto=true
PUT	/internal/tests	Continue/update an existing A/B test (AbtestSpec)
DELETE	/internal/tests/{testId}	Terminate a test by ID

---

Key Data Models

All models live in core/src/main/scala/com/iheart/thomas/abtest/model/package.scala.

UserGroupQuery (POST body for /users/groups/query)

{
  "userId": "string | null",
  "at": "ISO-8601 datetime | null",
  "tags": ["string"],
  "meta": { "key": "value" },
  "features": ["featureName"],
  "eligibilityControlFilter": "All | On | Off"
}

AbtestSpec (POST/PUT body for test creation)

{
  "name": "string",
  "feature": "string",
  "author": "string",
  "start": "ISO-8601 datetime",
  "end": "ISO-8601 datetime | null",
  "groups": [
    { "name": "string", "size": 0.5, "meta": {}, "description": "string | null" }
  ],
  "requiredTags": ["string"],
  "alternativeIdName": "string | null",
  "userMetaCriteria": "object | null",
  "reshuffle": false,
  "segmentRanges": [{ "start": 0.0, "end": 1.0 }],
  "specialization": "MultiArmBandit | null",
  "note": "string | null"
}

UserGroupQueryResult (response)

{
  "at": "epoch millis",
  "groups": { "featureName": "groupName" },
  "meta": {}
}

Entity[Abtest] (response)

{
  "_id": "string",
  "data": { /* Abtest fields same as AbtestSpec but with ranges and salt */ }
}

---

Implementation Tasks

1. Add a static openapi.yaml file to http4s/src/main/resources/swagger/openapi.yaml (or at the project root as docs/openapi.yaml) documenting all endpoints above with request/response schemas.

2. Serve Swagger UI — Add a new SwaggerUIRoutes http4s service in http4s/src/main/scala/com/iheart/thomas/http4s/SwaggerUIRoutes.scala that:

   • Serves the openapi.yaml at GET /swagger/openapi.yaml
   • Serves the Swagger UI HTML at GET /swagger-ui using swagger-ui webjars or inline HTML pointing to a CDN.

3. Wire up the new routes into AdminUI.scala so Swagger UI is accessible when running the server.

4. Add swagger-ui webjar dependency to build.sbt (or project/Dependencies.scala):

   "org.webjars" % "swagger-ui" % "5.17.14"
   // or use http4s-swagger from tapir if already preferred

5. Update README.md with a note on how to access the Swagger UI (e.g., http://localhost:8080/swagger-ui).

---

File locations in the repo

• HTTP routes: http4s/src/main/scala/com/iheart/thomas/http4s/abtest/AbtestService.scala
• Management routes: http4s/src/main/scala/com/iheart/thomas/http4s/abtest/AbtestManagementService.scala
• Server wiring: `http4s/src/main/scala/com/ihear...

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[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Failed	Infrastructure as Code	1   1   35   25	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

🛡️ The following IaC misconfigurations have been detected

	NAME	FILE
	Global Server Object Uses HTTP	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response Code Missing (v3)	...swagger/openapi.yaml	View in code
	Response on operations that should have a body has undefined schema	...swagger/openapi.yaml	View in code
	Response on operations that should have a body has undefined schema	...swagger/openapi.yaml	View in code
	Empty Array	...swagger/openapi.yaml	View in code
	Empty Array	...swagger/openapi.yaml	View in code
	Empty Array	...swagger/openapi.yaml	View in code
	Empty Array	...swagger/openapi.yaml	View in code
	Path Is Ambiguous	...swagger/openapi.yaml	View in code
	Path Is Ambiguous	...swagger/openapi.yaml	View in code
...	...	...	...