Product registry: catalogs, revisions, product info and libraries

The hub registers catalogs (hidden until a moderator approves them), hands out upload tokens, and records the revisions catalogs register after validating uploads: numbered, never changed, signed by the hub (its own Ed25519 key, published at /.well-known/t5de-keys.json). Creators edit product info (descriptions cleaned by an allowlist) and can retract revisions. People get products into their library, optionally staying on a revision; the proxy asks which revision to load and where. Contract in docs/products.md. Co-Authored-By: Claude Opus 5.5 <[email protected]>
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+# Products, catalogs and the library: the contract
+
+How the hub (registry), catalogs (`t5de-catalog`, file hosting) and T5DE's proxy work together. The design and the
+reasons are in `design.md` ("Products and catalogs", "Revisions", "In the client's shop and inventory"); this is
+what each side sends.
+
+## Words
+
+- **Product**: a T5 product, owned by its creator (a hub person). ID: 10 characters of `a-z2-7` (random), e.g.
+  `k3mq7xa2pd`. Valid as a pack ID, so the proxy can store a downloaded product as a pack.
+- **Revision**: a product's files, numbered 1, 2, 3... Never changes. Its **file list** is
+  `[{name, sha256, size}]`, sorted by name; `sha256` is lowercase hex.
+- **Catalog**: a server storing files by sha256 and serving them. Registered on the hub; hidden until a hub
+  moderator approves it.
+- **Library**: the products a person "got" (free), per person (all their IMVU accounts), optionally staying on a
+  revision.
+
+## Tokens
+
+The hub signs tokens with its own Ed25519 key (EdDSA JWTs, compact form), published as a JWKS at
+`GET /.well-known/t5de-keys.json` (`kid` in each token's header). Catalogs fetch it (and again when they see an
+unknown `kid`). Claims always include `iss` (the hub's API URL), `typ` (below) and `iat`.
+
+| `typ` | Other claims | Lifetime | Use |
+| --- | --- | --- | --- |
+| `t5de-upload` | `sub` (person ID), `catalog` (catalog ID), `product` (optional: a new revision of this product) | 30 min | the creator's browser uploads to the catalog |
+| `t5de-access` | `sub` (person ID), `adult` (bool) | 1 h | the proxy fetches adult files from catalogs |
+| `t5de-revision` | `product`, `revision`, `rating`, `files` (the file list), `parent` (IMVU product ID or 0) | none (`exp` absent) | the hub vouches for a revision's files |
+
+## Catalog API (`t5de-catalog`)
+
+Served at the catalog's public URL. CORS: the hub website's origin may call `POST /api/v1/uploads`.
+
+| | |
+| --- | --- |
+| `GET /health` | `{ok: true}` |
+| `POST /api/v1/uploads` | `Authorization: Bearer <t5de-upload token>`; multipart form: `file` (the product as a zip: Create Mode's `.chkn`, files at the root) and `notes` (text, required for a new revision of an existing product, optional for the first). The catalog validates the files (t5de-api `pack` rules: names, limits, `index.xml` with `ProductRating` GA/AP), stores each file by sha256, then registers the revision with the hub (below) and answers the hub's answer: 201 `{product, revision}`. Errors: `{error, message}`, 400 for bad files, 401 for a bad token, 502 if the hub refused or failed. |
+| `GET /api/v1/files/<sha256>` | the file's bytes, `Cache-Control: public, max-age=31536000, immutable` and `ETag` = the hash. A file used only by adult revisions needs `Authorization: Bearer <t5de-access token>` with `adult: true` (else 401/403, and `Cache-Control: private`). 404 if the catalog doesn't have it. |
+| `GET /api/v1/revisions/<product>/<revision>` | `{product, revision, rating, files}`, for revisions the catalog hosts |
+
+Configuration (environment): `CATALOG_ADDR` (listen address, default `127.0.0.1:4102`), `CATALOG_DATA` (data folder:
+SQLite database and files), `CATALOG_PUBLIC_URL`, `HUB_URL` (the hub's API), `CATALOG_ID` and `CATALOG_KEY` (from
+registering on the hub), `WEB_ORIGIN` (the hub website, for CORS).
+
+## Hub API
+
+### For catalogs (server to server)
+
+`Authorization: Catalog <catalog ID>:<key>`. Only approved catalogs.
+
+| | |
+| --- | --- |
+| `POST /api/v1/catalog/revisions` | `{uploadToken, files, rating ("general" or "adult"), parent (IMVU product ID or 0), name (from index.xml, for a new product), notes}` → 201 `{product, revision}`. The upload token must be for this catalog. Without `product` in the token, a new product is made (owner: the token's person, name from `name`). With it, a new revision of that product (the person must own it; `notes` required). A file list identical to the latest revision's is refused (409 `unchanged`). |
+
+### For people (website, signed in; the proxy with its bearer token)
+
+| | |
+| --- | --- |
+| `POST /api/v1/catalogs` | register a catalog: `{name, url, contact, visibility ("public"/"private"), membership ("open"/"approval"/"invite")}` → 201 `{catalog, key}` (the key is shown once) |
+| `GET /api/v1/catalogs` | (anyone) approved public catalogs; the person's own, any status |
+| `POST /api/v1/products/upload` | `{catalog, product?}` → `{token, url}`: an upload token and the catalog's upload URL |
+| `GET /api/v1/products?q=&creator=` | (anyone) products, newest first; adult ones only for people with an adult account |
+| `GET /api/v1/products/:id` | (anyone, adult rule as above) `{product, revisions, inLibrary?, mine?}` |
+| `PATCH /api/v1/products/:id` | (creator) `{name?, description?, rating?}`; description is HTML, cleaned by the allowlist; rating may go general → adult |
+| `POST /api/v1/products/:id/revisions/:n/retract` | (creator) |
+| `GET /api/v1/library` | `{library: [{product, revision, stayOn}]}`: the person's products, each with the revision to use |
+| `PUT /api/v1/library/:id` | get a product (add it) |
+| `DELETE /api/v1/library/:id` | remove it |
+| `PATCH /api/v1/library/:id` | `{stayOn: n or null}` |
+| `GET /api/v1/products/:id/files` | for the proxy: `{product, revision, rating, parent, name, files, catalogs: [url], token}` for the revision this person uses (their pin, else the latest that isn't retracted); `token` is the `t5de-revision` token |
+| `POST /api/v1/access` | for the proxy: `{token}`, a `t5de-access` token (`adult` if any of the person's IMVU accounts counts as adult) |
+
+The realtime connection also tells the proxy `{"type": "library"}` when the person's library changes.
+
+### Console (moderators)
+
+`GET /api/v1/console/catalogs`, `POST /api/v1/console/catalogs/:id/approve`, `.../reject`.
+
+## The proxy
+
+- Fetches the library at connect and on `library` messages; for each product, `GET /api/v1/products/:id/files`,
+  downloads missing files from a listed catalog (`GET <catalog>/api/v1/files/<sha256>`, with an access token for
+  adult revisions), checks each sha256, and writes the product as a pack in its cache
+  (`%APPDATA%\T5DE\proxy\hub-products\<id>\`: `t5de-product.json` with the hub's name and rating, and `files/`).
+  From there it's served like any pack.
+- Products others wear in a room that it doesn't have are fetched the same way, then given to the client.
+- Library products appear in the client's inventory (see the proxy's README).