dhkatzandClaude Opus 5.5
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
90 lines
3.9 KiB
Markdown
90 lines
3.9 KiB
Markdown
# Product packs (format 1)
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A product pack is a folder on the user's machine holding one community product: its manifest,
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`t5de-product.json`, and the product's files. T5DE's proxy serves packs to the client as if they were IMVU
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products. Package `pack` reads and checks them (`pack.Load`).
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```
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blue-fur-coat/
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t5de-product.json
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product.chkn the files, zipped (or files/, not both)
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```
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## Manifest
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`t5de-product.json`, UTF-8 JSON:
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```json
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{
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"format": 1,
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"id": "blue-fur-coat",
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"revision": 1,
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"name": "Blue Fur Coat",
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"creator": "Some Creator",
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"description": "<p>HTML description</p>",
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"rating": "general"
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}
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```
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| Field | Rules |
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| --- | --- |
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| `format` | 1 |
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| `id` | 1-64 of `a-z`, `0-9` and `-`, not starting or ending with `-`. Names the product locally; the hub assigns global IDs later. |
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| `revision` | an integer, at least 1. Raise it when the files change, so the client doesn't keep the old ones cached. |
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| `name` | 1-64 characters after trimming spaces, no control characters |
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| `creator` | optional; up to 64 characters, no control characters |
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| `description` | optional; HTML, up to 20000 bytes. Cleaned by an allowlist (package `safehtml`) wherever it's shown. |
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| `rating` | `general` or `adult`; must agree with `index.xml` (below) |
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Other fields are an error, and so is anything after the object.
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## Files
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The product's files are IMVU's product files, as Create Mode makes them: `index.xml` (required), meshes
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(`.xmf`), materials (`.xrf`), textures (`.png`, `.jpg`), and so on. They come one of two ways:
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- `product.chkn`: a zip file, Create Mode's project format, with the files at its root. Folder entries are
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ignored; files inside folders are an error.
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- `files/`: a folder with the files at its top level. Subfolders are an error.
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Having both is an error. Other files in the pack's folder are ignored.
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Rules for each file:
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- Names: not empty, no `/` or `\`, not `.` or `..`, no control characters, Latin-1 characters only (CFL files
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store names as Latin-1), at most 200 bytes (UTF-8). No two files with the same name.
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- `_contents.json` isn't allowed: it makes the client download a product's files separately, which packs don't
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support.
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- Limits: 512 files, 64 MiB per file, 256 MiB in all (uncompressed; sizes are counted while reading, not taken
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from the zip's headers).
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`pack.Checksum` hashes the files' names and contents (sha256), so the same files give the same checksum however
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they're stored or compressed. The proxy uses it to notice changes.
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## index.xml
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IMVU's product template (root element `<Template>`). T5DE reads only these top-level elements and ignores the
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rest:
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| Element | Use |
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| --- | --- |
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| `ProductRating` | required: `GA` (general) or `AP` (adult), matching the manifest's `rating` |
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| `ProductName` | the name Create Mode gave it |
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| `ProductGender` | `female`, `male`, ... |
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| `ProductTypeID` | optional integer |
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| `BodyPatternProductId` | optional integer |
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| `__DATAIMPORT` | optional: `product://<id>/index.xml`, the IMVU product it derives from |
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A product usually derives from an IMVU parent product (a derivable mesh), as products made in Create Mode do. The
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client asks IMVU for the parent's whole derivation chain and loads the parents' files from IMVU, and the pack's
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files on top of them: a pack file with the same name as a parent's replaces it (checked with a texture in client
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554.8). So a pack holds only what it changes, and the parents' files never pass through T5DE.
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## How the proxy serves a pack
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The proxy builds the files into a CFL, IMVU's product container (package `cfl`), uncompressed, files in name
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order, and serves it at `productdata/<local ID>/<revision>`, the address the client asks for. The client caches a
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product's files by that address and file name, so a new revision makes clients load the new files. The proxy
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picks up changed files within a revision too, but a running client may keep the files it already loaded: raise
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the revision to be sure.
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