# Summer Core

> Gate skill for Summer Framework detection and shared types. MUST load first — verifies io.f8a.summer:summer-platform in build.gradle/pom.xml. If NOT FOUND, do NOT load any summer sub-skill. Provides version detection, module overview, shared domain types, and sub-skill routing.

- Skill: `taipt1504/summer-core` (Agent Skill, multi-file: 17 files)
- Install (CLI): `npx skillmds@latest add taipt1504/summer-core`
- Raw SKILL.md: https://api.skillmd.com/api/skills/taipt1504/summer-core/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: taipt1504 (https://skillmd.com/u/taipt1504)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/taipt1504/summer-core

---


# Summer Core — Gate & Shared Types

Reactive Spring Boot 3.x library (Java 21+) on WebFlux + Reactor Netty.
**Group:** `io.f8a.summer` | **BOM:** `summer-platform` | **Latest stable:** 0.3.5 (2026-05-10)
**Note:** `summer-payment-sdk` is versioned independently (`paymentSdkVersion`); BOM pins a known-good value per Summer release (since 0.3.3).

## Hard Gate

Check `build.gradle` or `pom.xml` for `io.f8a.summer:summer-platform`. **NOT FOUND → STOP. No summer sub-skill.**

## Version Detection

1. Read `gradle.properties` → `version=X.Y.Z`
2. Check `build.gradle` for `summer-platform` version
3. Pattern detection — primary signals:

   | Signal | Version |
   |---|---|
   | `Txid` / `TxidGenerator` / `MachineIdResolver` / `summer-file` artifact | 0.3.5+ |
   | `SseQueryParamTokenFilter` / `SseAuthCustomizer` / `ProviderJwtDecoderResolver` | 0.3.4+ |
   | `Provider.issuerUri` config field / `BROADCAST_SCOPE` | 0.3.3+ |
   | `MultiRealmAuthenticationConverter` / `providers.<id>` schema | 0.3.2+ |
   | `summer-kafka-consumer` artifact / `KafkaOutboxPublisher` auto-bean | 0.3.1+ |
   | `JwtBlacklistChecker` / `blacklist-prefix-key` | 0.3.0+ |
   | `OutboxProperties.Cdc` (nested) / `f8a.outbox.publisher.mode: cdc` | 0.2.8+ |
   | `@Compact` (not `@Hex`) / `@TX` (not `@TXN`) | 0.2.6+ |
   | `Ufid` / `summer-payment-sdk` artifact | 0.2.5+ |
   | `GroupRoleResolver` / `group-role-authorization` | 0.2.4+ |
   | `keycloak.*` shared block (not under `sync-role.*`) | 0.2.4+ |
   | `sync-role.enabled` (not `.enable`) | 0.2.3+ |
   | `RateLimiterService` | 0.2.2+ |
   | `SummerGlobalExceptionHandler` / `summer-jwt-resource-server` | 0.2.1+ |

4. Unclear → ask. Never guess.

Older than latest stable: load `<skill>/references/versions/<version>.md` overlay alongside `SKILL.md`. See [references/version-matrix.md](references/version-matrix.md) for full feature × version table.

## Module Overview (current — 0.3.x)

| Module                             | Config Prefix                                                                    | Activation [^1]                                  |
|------------------------------------|----------------------------------------------------------------------------------|--------------------------------------------------|
| `summer-rest-autoconfigure`        | `f8a.common`                                                                     | Auto                                             |
| `summer-data-autoconfigure`        | `summer.r2dbc.txid-column-type` (0.3.5+)                                         | Auto                                             |
| `summer-data-audit-autoconfigure`  | `f8a.audit`                                                                      | Auto                                             |
| `summer-data-outbox-autoconfigure` | `f8a.outbox.publisher.{queue, scheduler.*, cdc.*}` (0.3.1+)                      | `f8a.outbox.enabled=true` (default)              |
| `summer-kafka-consumer-autoconfigure` (0.3.1+) | `f8a.kafka.consumer.{idempotency.*, retry.*}`                        | Auto when `summer-kafka-consumer` on classpath   |
| `summer-security-autoconfigure`    | `f8a.security.apisix.resource-server.providers.<id>` (0.3.0+)                    | `enabled=true` (default since 0.2.3)             |
| `summer-ratelimit-autoconfigure`   | `f8a.rate-limiter`                                                               | Auto (0.2.2+ only)                               |
| `summer-keycloak` (client)         | —                                                                                | Manual bean creation                             |
| `summer-keycloak` (role sync)      | `f8a.security.apisix.resource-server.sync-role: <provider-id>` (0.3.2+)          | When `sync-role` points to a provider (0.3.2+)   |
| `summer-keycloak` (group-role)     | per-provider `group-role-authorization: true` + global `group-role-authorization.*` (0.3.2+) | `true` on a provider (0.3.2+)         |
| `summer-file` (0.3.5+)             | —                                                                                | Manual — no Spring auto-config                   |
| `summer-payment-sdk`               | —                                                                                | Manual — wire DTOs only; independent version axis |

[^1]: "Auto" means Spring Boot auto-configuration activates when the required dependency is on the classpath (Spring Boot for REST, R2DBC for data modules).

For 0.2.x schemas (single `keycloak.*` block, single `sync-role.enabled`, top-level
`group-role-authorization.enabled`) load the matching `<skill>/references/versions/0.2.x.md`.

## Gradle Setup

Declare BOM first; sub-skills list their own modules.

```gradle
implementation platform('io.f8a.summer:summer-platform:<version>')
```

## Shared Types

| Type | Package | Purpose |
|---|---|---|
| `Member` | `core.security.authentication` | Authenticated user: id, username, givenName, familyName, email, authorities |
| `CallerAware` | `core.security.authentication` | Mixin → `getCaller()` returns `Mono<Member>` |
| `Password` | `core` | Value object; validate with `@ValidPassword` |
| `PhoneNumber` | `core` | Value object; validate with `@ValidPhoneNumber` |
| `ViewableException` | `core.exception` | Base HTTP exception with `.detail()` fluent builder |
| `JsonErrorResponse` | `core.exception` | Error response DTO: code, message, traceId, timestamp, details |
| `Ufid` | `core.domain.types.ufid` | 128-bit sortable canonical key (0.2.5+). Crockford Base32 display (0.2.6+); UUID-storable. |
| `Txid` (0.3.5+) | `core.domain.types.txid` | Snowflake-style 59-bit transaction reference. 18-digit zero-padded decimal on wire; fits BIGINT. **Distinct from `Ufid`** — `Ufid` is internal canonical, `Txid` is human-facing receipt number. |
| `TxidGenerator` (0.3.5+) | `core.domain.types.txid` | Synchronized monotonic generator (4096 IDs/ms/machine). Constructed with a fixed `machineId` or a `Supplier<Long>` re-evaluated per call. |
| `MachineIdResolver` (0.3.5+) | `core.domain.types.txid` | Resolves machineId from `SUMMER_TXID_MACHINE_ID` env / `summer.txid.machine-id` system property / Kubernetes StatefulSet ordinal. Throws if none set — never silently hashes hostname. |
| `RedisMachineIdReservation` (0.3.5+) | `core.domain.types.txid` | Self-healing distributed slot lease (`Closeable + Supplier<Long>`). Use when StatefulSet ordinals aren't available (vanilla Deployment, Cloud Run, autoscaled fleets). |

## CommonExceptions Enum

`RESOURCE_NOT_FOUND`(404), `INVALID_REQUEST`(400), `VALIDATION_ERROR`(422), `UNAUTHORIZED`(401), `ACCESS_DENIED`(403), `FORBIDDEN`(403), `CONFLICT`(409), `RATE_LIMIT_EXCEEDED`(429), `INTERNAL_SERVER_ERROR`(500), `SERVICE_UNAVAILABLE`(503), `TIMEOUT`(504), `NOT_ACCEPTABLE`(406), `UNSUPPORTED_MEDIA_TYPE`(415), `PAYLOAD_TOO_LARGE`(413).

Usage: `throw CommonExceptions.RESOURCE_NOT_FOUND.toException().detailValue("id", id);`

## Sub-Skill Router

| Context | Load |
|---|---|
| Handler, controller, WebClient, Jackson, exception handling | **summer-rest** |
| Audit, outbox, R2DBC converters, DDL, Txid R2DBC converters | **summer-data** |
| APISIX auth, @AuthRoles, Keycloak client, role sync, SSE auth (0.3.4+) | **summer-security** |
| Rate limiting (0.2.2+) | **summer-ratelimit** |
| Tests, WireMock, Testcontainers, blackbox | **summer-test** |
| `@KafkaListener` idempotency, DLT, error handler (0.3.1+) | **summer-kafka** |
| Streaming zip / xlsx exports (0.3.5+) | **summer-file** |
| Payment event DTOs, prefix annotations, producer-routing (0.3.3+) | **summer-payment-sdk** |

## Sub-Skill Gate Verification

Every summer sub-skill MUST verify this gate loaded. If triggered directly, check build.gradle for `io.f8a.summer:summer-platform` first.

## Rules

- Never guess Summer version — detect from gradle.properties or pattern matching; ask if unclear.
- Never load summer sub-skills without confirming gate.
- Check version compatibility before suggesting features (rate limiting: 0.2.2+; `Txid`/`summer-file`: 0.3.5+; SSE filter/`ProviderJwtDecoderResolver`: 0.3.4+).
- Use `ViewableException` (not generic RuntimeException) for HTTP error responses.
- **`Ufid` ≠ `Txid`.** `Ufid` = 128-bit canonical key (joinable, immutable, collision-safe). `Txid` = 59-bit human-facing transaction reference (sortable by mint time, fits BIGINT). Not interchangeable — `Ufid` is wrong for wallet/payment receipt numbers; `Txid` cannot hold pre-2026 ids.

## References

- **[references/summer-types.md](references/summer-types.md)** — Member, CallerAware, Password, PhoneNumber, ViewableException, JsonErrorResponse, CommonExceptions usage
- **[references/version-matrix.md](references/version-matrix.md)** — Feature × version matrix + pattern detection signals
- **[references/versions/](references/versions/)** — Per-version notes for cross-cutting changes; sub-skills carry own version dirs
- **[references/migrations/](references/migrations/)** — Step-by-step migration guides between major schema/version transitions
- **[references/versioning-workflow.md](references/versioning-workflow.md)** — How to add new Summer release (maintainers)

## Related Skills

- **summer-rest** — Handlers, ResponseFactory, WebClientBuilderFactory
- **summer-data** — AuditService, OutboxService, R2DBC converters (incl. Txid converters, 0.3.5+)
- **summer-security** — APISIX auth, @AuthRoles, Keycloak, SSE filter (0.3.4+)
- **summer-ratelimit** — Rate limiting (0.2.2+)
- **summer-test** — PostgresTestContainer, WireMock, blackbox
- **summer-kafka** — `@KafkaListener` LSN-watermark idempotency, DLT (0.3.1+)
- **summer-file** — Streaming zip/xlsx exporter (0.3.5+)
- **summer-payment-sdk** — Shared event DTOs, prefix annotations, producer-routing vocabulary