Crate multistore 

s3-proxy-core

Runtime-agnostic core library for the S3 proxy gateway.

This crate defines the trait abstractions that allow the proxy to run on multiple runtimes (Tokio/Hyper for containers, Cloudflare Workers for edge) without either runtime leaking into the core logic.

Key Abstractions

• route_handler::ProxyResponseBody — concrete response body type (Stream, Bytes, Empty)
• backend::ProxyBackend — create object stores and send raw HTTP requests
• registry::BucketRegistry — bucket lookup, authorization, and listing
• registry::CredentialRegistry — credential and role storage
• auth — SigV4 request verification and credential resolution
• api::request — parse incoming S3 API requests into typed operations
• api::response — serialize S3 XML responses
• route_handler::RouteHandler — pluggable pre-dispatch request interception (OIDC, STS, etc.)
• middleware::Middleware — composable post-auth middleware for dispatch
• backend::ForwardResponse — response type for backend forwarding (method on backend::ProxyBackend)
• router::Router — path-based route matching via matchit for efficient dispatch
• proxy::ProxyGateway — the main request handler that ties everything together

Modules

api

S3 API parsing and response serialization.

auth

Authentication and authorization.

backend

Backend abstraction for proxying requests to backing object stores.

error

Error types for the proxy.

maybe_send

Conditional Send/Sync bounds for traits whose wasm implementations use !Send types (JS interop via Rc<RefCell<...>>, JsValue, etc.).

middleware

Composable post-auth middleware for dispatch.

proxy

The main proxy gateway that ties together registry lookup and backend forwarding.

registry

Registry abstractions for bucket policy and credential storage.

route_handler

Pluggable route handler trait for pre-dispatch request interception.

router

Path-based request router.

types

Shared types used across the proxy.