platform: hello-world — the greetings wall #2

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plat merged 8 commits from prime into main 2026-08-15 18:21:19 +00:00

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plat commented 2026-08-14 14:20:01 +00:00

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hello-world was migrated from octocat/Hello-World — a repo whose entire contents are a one-line README reading Hello World!. The platform integration kit (Dockerfile, chart, workflows) landed on prime, but the Dockerfile had nothing to build: no package.json, no src/, no web/. That is why the build runs kept dying and preview went red on 3ce9becf0b.

This PR builds the app that plumbing expects, around the one line the repo has always carried: a wall of hellos.

What changed

The app — Fastify 5 + TypeScript with TypeBox-typed routes (OpenAPI generated from them at /openapi.json), a React 19 SPA under web/ with a web/src/ui/ component kit, biome lint, and the platform's Bun image unchanged.

The wall — twelve greetings ship with it (English through Te reo Māori, inserted by a migration). Anyone can read and filter it; the composer adds a greeting; a Remove button appears only on greetings your account posted, enforced server-side.

Data — Postgres (CNPG) with numbered, append-only migrations in src/migrate.ts, applied at boot before the pod reports ready, with a 60-second retry window for a cold cluster — matching the chart's startupProbe budget, so the chart's optional migrate Job isn't needed.

Docs — README.md, a real MIGRATION.md (what arrived, what was built, what was decided), and wiki/ pages for the flows, the API and the data model.

Decisions worth knowing

• Posting follows the identity the deployment actually has. This environment runs with the forwardAuth edge off org-wide and no in-app OAuth credentials, so /api/me is anonymous for every visitor. Gating writes on a sign-in that cannot happen would have shipped an ornament. So: where a sign-in exists, posting requires it and greetings are attributed to the account; where none exists, the wall accepts anonymous greetings signed with an optional "From" name, rate-limited to 10 per IP per 10 minutes. Nothing on a wall of hellos is private, so this costs no confidentiality — and the moment a sign-in exists the app requires it again with no code change. Removing is always identity-bound, so seeded and anonymous greetings belong to nobody.
• Nothing relies on the edge. Identity is resolved in-app on every request, in a preValidation hook that runs before a body is parsed. In platform mode the app verifies the X-Plat-* headers itself and fails closed when PLAT_EDGE_TOKEN is configured but absent or wrong — a forged header sent straight at the pod gets nothing.
• Degrade, don't die. This deployment was provisioned without a database. Rather than failing readiness forever, the app serves the wall from a JSON file on its mounted volume and reports which store answered on /readyz (degraded: true if Postgres was configured but unreachable). Provisioning a database later needs no code change — the migrations take over.
• Sessions are signed cookies, not a session table. In-app SSO is a plain OAuth2 authorization-code flow against Forgejo; the identity lands in an HMAC-signed httpOnly cookie keyed by BETTER_AUTH_SECRET. Nothing to provision, and sign-out is a cookie clear.
• Platform plumbing (Dockerfile, charts/app/, .forgejo/workflows/) is untouched. The original one-line README is kept as it arrived — it is the provenance, and the homepage quotes it.

How verified

npm run lint, npm run typecheck and npm run build pass locally on every pushed commit; check/preview are green on the head commit c7cff4c; lint_design reports zero findings (all styling flows through the org token vocabulary).

Playwright self-test against the live preview (https://pr-2-hello-world-imp-e2e-org.open-platform.sh):

• Desktop (1280×900) — the wall renders all twelve seeded greetings with language, author and relative time. Filled the composer (Welsh / Helo, byd! / from worker-agent) and clicked Post greeting: the greeting appeared at the top of the wall immediately and the counters moved to 13. Typed wel in the filter → narrowed to Helo, byd! and Hallo, Welt!; typed zzz → the empty state with its Clear filter button, which restored the wall. browser_console_messages: 0 messages, 0 errors.
• Mobile (390×844) — re-drove the same pages: single-column layout, full-width fields and button, cards intact. document.documentElement.scrollWidth === clientWidth === 390 and no element extends past the viewport, so there is no page-level horizontal scroll. Posted a second greeting (Icelandic / Halló, heimur!) from the mobile layout — accepted and rendered. Console clean.
• Persistence — both greetings survived two redeploys (14 on the wall on the final build), confirming the volume-backed store holds across pod replacement. Re-checked the final head build in the browser: renders correctly, console clean.
• API, by hand against the preview — anonymous POST was refused 401 on the earlier build (before the write rule was adapted), and the rate limiter returns 429 after 10 anonymous posts in the window; DELETE without an account is 401, someone else's greeting is 403, a missing id is 404; forged X-Plat-User headers without the edge token leave /api/me anonymous.

Preview: https://pr-2-hello-world-imp-e2e-org.open-platform.sh

**hello-world** was migrated from [octocat/Hello-World](https://github.com/octocat/Hello-World) — a repo whose entire contents are a one-line `README` reading *Hello World!*. The platform integration kit (Dockerfile, chart, workflows) landed on `prime`, but the Dockerfile had nothing to build: no `package.json`, no `src/`, no `web/`. That is why the build runs kept dying and `preview` went red on `3ce9becf0b`. This PR builds the app that plumbing expects, around the one line the repo has always carried: **a wall of hellos**. ## What changed **The app** — Fastify 5 + TypeScript with TypeBox-typed routes (OpenAPI generated from them at `/openapi.json`), a React 19 SPA under `web/` with a `web/src/ui/` component kit, biome lint, and the platform's Bun image unchanged. **The wall** — twelve greetings ship with it (English through Te reo Māori, inserted by a migration). Anyone can read and filter it; the composer adds a greeting; a Remove button appears only on greetings your account posted, enforced server-side. **Data** — Postgres (CNPG) with numbered, append-only migrations in `src/migrate.ts`, applied at boot before the pod reports ready, with a 60-second retry window for a cold cluster — matching the chart's startupProbe budget, so the chart's optional migrate Job isn't needed. **Docs** — `README.md`, a real `MIGRATION.md` (what arrived, what was built, what was decided), and `wiki/` pages for the flows, the API and the data model. ## Decisions worth knowing - **Posting follows the identity the deployment actually has.** This environment runs with the forwardAuth edge off org-wide and no in-app OAuth credentials, so `/api/me` is anonymous for every visitor. Gating writes on a sign-in that cannot happen would have shipped an ornament. So: where a sign-in exists, posting **requires** it and greetings are attributed to the account; where none exists, the wall accepts anonymous greetings signed with an optional "From" name, rate-limited to 10 per IP per 10 minutes. Nothing on a wall of hellos is private, so this costs no confidentiality — and the moment a sign-in exists the app requires it again with no code change. **Removing is always identity-bound**, so seeded and anonymous greetings belong to nobody. - **Nothing relies on the edge.** Identity is resolved in-app on every request, in a `preValidation` hook that runs before a body is parsed. In platform mode the app verifies the `X-Plat-*` headers itself and fails closed when `PLAT_EDGE_TOKEN` is configured but absent or wrong — a forged header sent straight at the pod gets nothing. - **Degrade, don't die.** This deployment was provisioned without a database. Rather than failing readiness forever, the app serves the wall from a JSON file on its mounted volume and reports which store answered on `/readyz` (`degraded: true` if Postgres was configured but unreachable). Provisioning a database later needs no code change — the migrations take over. - **Sessions are signed cookies, not a session table.** In-app SSO is a plain OAuth2 authorization-code flow against Forgejo; the identity lands in an HMAC-signed httpOnly cookie keyed by `BETTER_AUTH_SECRET`. Nothing to provision, and sign-out is a cookie clear. - Platform plumbing (`Dockerfile`, `charts/app/`, `.forgejo/workflows/`) is untouched. The original one-line `README` is kept as it arrived — it is the provenance, and the homepage quotes it. ## How verified `npm run lint`, `npm run typecheck` and `npm run build` pass locally on every pushed commit; `check`/`preview` are green on the head commit `c7cff4c`; `lint_design` reports zero findings (all styling flows through the org token vocabulary). **Playwright self-test against the live preview** (`https://pr-2-hello-world-imp-e2e-org.open-platform.sh`): - **Desktop (1280×900)** — the wall renders all twelve seeded greetings with language, author and relative time. Filled the composer (Welsh / *Helo, byd!* / from `worker-agent`) and clicked **Post greeting**: the greeting appeared at the top of the wall immediately and the counters moved to 13. Typed `wel` in the filter → narrowed to *Helo, byd!* and *Hallo, Welt!*; typed `zzz` → the empty state with its **Clear filter** button, which restored the wall. `browser_console_messages`: **0 messages, 0 errors**. - **Mobile (390×844)** — re-drove the same pages: single-column layout, full-width fields and button, cards intact. `document.documentElement.scrollWidth === clientWidth === 390` and no element extends past the viewport, so there is no page-level horizontal scroll. Posted a second greeting (Icelandic / *Halló, heimur!*) from the mobile layout — accepted and rendered. Console clean. - **Persistence** — both greetings survived two redeploys (14 on the wall on the final build), confirming the volume-backed store holds across pod replacement. Re-checked the final head build in the browser: renders correctly, console clean. - **API, by hand against the preview** — anonymous `POST` was refused `401` on the earlier build (before the write rule was adapted), and the rate limiter returns `429` after 10 anonymous posts in the window; `DELETE` without an account is `401`, someone else's greeting is `403`, a missing id is `404`; forged `X-Plat-User` headers without the edge token leave `/api/me` anonymous. Preview: https://pr-2-hello-world-imp-e2e-org.open-platform.sh

plat added 1 commit 2026-08-14 14:20:01 +00:00

platform: integration kit (CI + chart skeleton) [skip ci] 59672e61dc

plat commented 2026-08-14 14:20:02 +00:00

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⚠️ The build run crashed (exit code null). What's pushed here is as far as it got — re-creating the repo retries from scratch, or label this PR agent-work to have an agent pick it up.

⚠️ The build run crashed (exit code null). What's pushed here is as far as it got — re-creating the repo retries from scratch, or label this PR `agent-work` to have an agent pick it up.

plat commented 2026-08-14 14:20:03 +00:00

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⚠️ The build run crashed (exit code null). What's pushed here is as far as it got — re-creating the repo retries from scratch, or label this PR agent-work to have an agent pick it up.

⚠️ The build run crashed (exit code null). What's pushed here is as far as it got — re-creating the repo retries from scratch, or label this PR `agent-work` to have an agent pick it up.

plat commented 2026-08-14 14:20:04 +00:00

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⚠️ The build run crashed (exit code null). What's pushed here is as far as it got — re-creating the repo retries from scratch, or label this PR agent-work to have an agent pick it up.

⚠️ The build run crashed (exit code null). What's pushed here is as far as it got — re-creating the repo retries from scratch, or label this PR `agent-work` to have an agent pick it up.

plat changed title from 🏗️ platform: hello-world to platform: hello-world 2026-08-14 14:20:05 +00:00

plat commented 2026-08-14 14:20:06 +00:00

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🤖 The build was interrupted repeatedly — handing what exists to the validator; label agent-work to continue building.

🤖 The build was interrupted repeatedly — handing what exists to the validator; label `agent-work` to continue building.

plat added 1 commit 2026-08-14 16:36:46 +00:00

ci: nudge 3ce9becf0b

plat commented 2026-08-14 16:38:11 +00:00

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🔴 CI run preview failed on 3ce9becf0b — queuing an agent to look (added agent-work).

🔴 CI run `preview` failed on `3ce9becf0b` — queuing an agent to look (added `agent-work`).

plat added the

agent-working

label 2026-08-14 16:38:11 +00:00

plat changed title from platform: hello-world to 🏗️ platform: hello-world 2026-08-14 16:40:47 +00:00

plat commented 2026-08-14 16:41:13 +00:00

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🔄 worker working… #2 · 33m elapsed · 22+ steps

last action: mcp__plat__update_issue

Those Playwright snapshots got committed by an earlier git add -A — cleaning that up:

Live progress — updates while the agent runs; replaced by the final summary on completion.

<!-- plat-agent-heartbeat --> 🔄 **worker working…** #2 · 33m elapsed · 22+ steps last action: `mcp__plat__update_issue` > Those Playwright snapshots got committed by an earlier `git add -A` — cleaning that up: *Live progress — updates while the agent runs; replaced by the final summary on completion.*

imp-e2e-org added 1 commit 2026-08-14 16:41:25 +00:00

plan: build the hello-world app (Fastify+React) so the image builds and the app ships ... aeeba37aa6

Generated-By: worker/claude-opus-5/worker-imp-e2e-org-hello-world-mst6871ag

imp-e2e-org added 1 commit 2026-08-14 16:51:29 +00:00

feat: the hello-world app — Fastify 5 API + React SPA greetings wall ... 44b979fe2d

Migrated repo carried a one-line README and no code, so the platform
Dockerfile had nothing to build. This lays down the app it expects:

- Fastify 5 + TypeBox routes, OpenAPI generated from them (/openapi.json)
- Postgres (CNPG) store with numbered migrations in src/migrate.ts,
  seeded with twelve hellos; file-backed fallback on the mounted volume
  when no database is configured, reported on /readyz
- identity two ways: platform edge headers (fail-closed on PLAT_EDGE_TOKEN)
  or in-app Forgejo OAuth; anonymous reads, authenticated writes, 401
  raised in preValidation before a body is parsed
- React SPA under web/ with a web/src/ui component kit, styled only with
  org design tokens served at /tokens.css

Generated-By: worker/claude-opus-5/worker-imp-e2e-org-hello-world-mst6871ag

imp-e2e-org added 1 commit 2026-08-14 16:53:12 +00:00

docs: README, migration plan, and wiki pages for the greetings wall ... 28778c30b2

Generated-By: worker/claude-opus-5/worker-imp-e2e-org-hello-world-mst6871ag

plat commented 2026-08-14 16:54:26 +00:00

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🔎 Preview is live for QA: https://pr-2-hello-world-imp-e2e-org.open-platform.sh

🔎 Preview is live for QA: https://pr-2-hello-world-imp-e2e-org.open-platform.sh

imp-e2e-org added 1 commit 2026-08-14 17:03:06 +00:00

feat: let the wall take greetings where no sign-in exists ... 2c4be2771b

The preview (and prod) run with the forwardAuth edge off org-wide and no
in-app OAuth credentials, so /api/me is anonymous for everyone and nobody
could ever post — an app that is an ornament.

Posting now follows the identity the deployment actually has: required
and attributed where a sign-in exists, open (signed with an optional
From name, 10/IP/10min) where none does. Removing stays identity-bound
server-side, so seeded and anonymous greetings belong to nobody. /api/me
gained canPost so the UI shows a sign-in door only where signing in is
possible.

Generated-By: worker/claude-opus-5/worker-imp-e2e-org-hello-world-mst6871ag

imp-e2e-org added 1 commit 2026-08-14 17:06:10 +00:00

fix: persist the seeded wall on first boot so its greetings keep their dates ... 71ea61254a

Generated-By: worker/claude-opus-5/worker-imp-e2e-org-hello-world-mst6871ag

plat changed title from 🏗️ platform: hello-world to platform: hello-world — the greetings wall 2026-08-14 17:08:21 +00:00

plat commented 2026-08-14 17:08:40 +00:00

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Integration done — this PR (#2, branch prime) now carries the whole app, and the live preview is up:

https://pr-2-hello-world-imp-e2e-org.open-platform.sh

What shipped

The migrated repo was a one-line README and nothing else, so the platform Dockerfile had nothing to build — that is what kept killing the build runs and turned preview red on 3ce9becf0b. It now builds a real app around that line: a wall of hellos. Fastify 5 + TypeBox routes with OpenAPI generated from them, a React SPA with a web/src/ui/ kit styled only in org design tokens, Postgres migrations in src/migrate.ts that seed twelve greetings, and a volume-backed fallback so the app still serves where no database was provisioned (as here — /readyz says which store answered).

Two judgement calls worth your attention, both in the PR body: posting is open on this deployment because it has no sign-in anyone could use (the forwardAuth edge is off org-wide), rate-limited per IP, and re-gates itself automatically the moment a sign-in exists; and removing is always account-bound, so the seeded and anonymous greetings belong to nobody.

How it was verified

lint, typecheck, build green locally; check/preview green on 71ea612; lint_design clean. Then I drove the preview with Playwright: posted a greeting at desktop width (it appeared instantly, counters moved), filtered the wall down and into its empty state and back, then re-drove it at 390×844 and posted a second greeting from the mobile layout — no page-level horizontal scroll, zero console messages. Both greetings survived the next redeploy.

Next steps

• Wave at a greeting
• Shareable greeting pages
• Greet me in my language

add the agent-work label to any of these to have an agent build it.

Integration done — this PR (#2, branch `prime`) now carries the whole app, and the live preview is up: **https://pr-2-hello-world-imp-e2e-org.open-platform.sh** ### What shipped The migrated repo was a one-line `README` and nothing else, so the platform Dockerfile had nothing to build — that is what kept killing the build runs and turned `preview` red on `3ce9becf0b`. It now builds a real app around that line: **a wall of hellos**. Fastify 5 + TypeBox routes with OpenAPI generated from them, a React SPA with a `web/src/ui/` kit styled only in org design tokens, Postgres migrations in `src/migrate.ts` that seed twelve greetings, and a volume-backed fallback so the app still serves where no database was provisioned (as here — `/readyz` says which store answered). Two judgement calls worth your attention, both in the PR body: **posting is open on this deployment** because it has no sign-in anyone could use (the forwardAuth edge is off org-wide), rate-limited per IP, and re-gates itself automatically the moment a sign-in exists; and **removing is always account-bound**, so the seeded and anonymous greetings belong to nobody. ### How it was verified `lint`, `typecheck`, `build` green locally; `check`/`preview` green on `71ea612`; `lint_design` clean. Then I drove the preview with Playwright: posted a greeting at desktop width (it appeared instantly, counters moved), filtered the wall down and into its empty state and back, then re-drove it at 390×844 and posted a second greeting from the mobile layout — no page-level horizontal scroll, zero console messages. Both greetings survived the next redeploy. ### Next steps - [Wave at a greeting](https://git.open-platform.sh/imp-e2e-org/hello-world/issues/new?title=Add%20waves%20to%20the%20greetings%20wall&body=Let%20visitors%20wave%20at%20a%20greeting%20on%20the%20wall%3A%20a%20wave%20button%20on%20each%20card%20that%20increments%20a%20per-greeting%20count%20shown%20beside%20it%2C%20one%20wave%20per%20visitor%20per%20greeting%2C%20stored%20in%20a%20new%20migration-created%20table%20and%20exposed%20on%20the%20greetings%20API.) - [Shareable greeting pages](https://git.open-platform.sh/imp-e2e-org/hello-world/issues/new?title=Give%20each%20greeting%20its%20own%20page&body=Give%20every%20greeting%20a%20permalink%20at%20%2Fg%2F%3Cid%3E%20that%20renders%20it%20as%20its%20own%20page%20with%20the%20language%2C%20author%20and%20date%2C%20plus%20Open%20Graph%20and%20Twitter%20card%20meta%20so%20pasting%20the%20link%20anywhere%20shows%20the%20greeting.) - [Greet me in my language](https://git.open-platform.sh/imp-e2e-org/hello-world/issues/new?title=Pin%20the%20visitor's%20own%20language%20to%20the%20top%20of%20the%20wall&body=Use%20the%20browser's%20Accept-Language%20header%20to%20pin%20the%20matching%20greeting%20to%20the%20top%20of%20the%20wall%20with%20a%20short%20note%20saying%20it%20was%20matched%20to%20the%20visitor%2C%20falling%20back%20silently%20to%20the%20normal%20newest-first%20order%20when%20no%20greeting%20matches.) add the `agent-work` label to any of these to have an agent build it.

imp-e2e-org added 1 commit 2026-08-14 17:09:15 +00:00

chore: drop the Playwright session artifacts and ignore them ... c7cff4c515

Generated-By: worker/claude-opus-5/worker-imp-e2e-org-hello-world-mst6871ag

plat added spent time 2026-08-14 17:12:07 +00:00

33 minutes 53 seconds

plat removed the

agent-working

label 2026-08-14 20:22:41 +00:00

plat merged commit 3528a8bb19 into main 2026-08-15 18:21:19 +00:00

plat referenced this pull request from a commit 2026-08-15 18:21:20 +00:00

platform: hello-world — the greetings wall (#2)

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