steamroom

Rust library implementing the Steam client protocol for depot downloading, manifest parsing, and CDN interaction.

What's in this crate

• Connection & auth -- Connect to Steam CM servers over TCP or WebSocket, encrypt sessions, authenticate via credentials or QR code
• Depot manifests -- Parse and decrypt Steam depot manifests, list files, extract chunk metadata
• Chunk processing -- Decrypt and decompress depot chunks (AES-256-CBC, Valve LZMA, Valve zstd, zip)
• CDN -- Download manifests and chunks from Steam's CDN with server pool rotation and rate-limit handling
• Protobuf types -- Generated Steam protocol message types

Usage

use steamroom::client::SteamClient;
use steamroom::transport::websocket::WebSocketTransport;
use steamroom::connection::CmServer;
use steamroom::depot::manifest::DepotManifest;
use steamroom::depot::{AppId, DepotId, ManifestId};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Connect to Steam
    let servers = CmServer::fetch().await?;
    let ws = servers.iter().find(|s| s.protocol == steamroom::connection::Protocol::WebSocket).unwrap();
    let transport = WebSocketTransport::connect(ws).await?;
    let (client, _rx) = SteamClient::connect_ws(transport).await?;

    // Anonymous login (for free apps)
    // ... build logon message, call client.login() ...

    Ok(())
}

See the steamroom-cli crate for a complete working example, or steamroom-client for download orchestration.

License

MIT OR Apache-2.0