composer-wire

The Composer v2 repository wire format — the metadata documents a Composer 2 client and a Composer repository exchange — as reusable Rust types, plus the composer/2.0 minify/expand algorithm.

• PackageDocument — a p2/{vendor}/{name}.json document (the per-package version list), with expand() (apply the minified diff) and minified() / flat() constructors.
• RootManifest — the root packages.json (metadata-url, available-packages, …); unknown keys are preserved on round-trip.
• expand_versions / minify_versions — the composer/2.0 minified-metadata algorithm and its exact inverse.

use composer_wire::PackageDocument;

// `body` is a `p2/<vendor>/<name>.json` response (minified or not).
let by_name = PackageDocument::parse(body)?.expand(); // fully-materialized versions

A client parses and expands upstream metadata; a server builds and minifies metadata to serve. Sharing one implementation means the producer and consumer of the wire format can't drift — expand_versions(minify_versions(v)) == v.

Part of the composer-rs workspace — shared Composer-domain crates for the cresset-tools family (bougie, sconce). Extracted from bougie-composer.

License

EUPL-1.2.