refactor(caesar): restructure the project to a monorepo

caesar-shuttle/Cargo.toml

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+[package]
+name = "caesar-transfer-iu"
+version = "0.3.1"
+edition = "2021"
+authors = ["Manuel Keidel, Patryk Hegenberg, Krzysztof Stankiewicz"]
+
+[[bin]]
+name = "caesar-transfer-iu"
+path = "src/main.rs"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+caesar-core = { path = "../caesar-core" }
+shuttle-axum = { version = "0.44.0" }
+shuttle-runtime = { version = "0.44.0" }
+axum = { version = "0.7.5", features = ["ws"] }
+axum-client-ip = "0.6.0"

caesar-shuttle/src/main.rs

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+use axum::{
+    routing::{get, post, put},
+    Router,
+};
+use axum_client_ip::SecureClientIpSource;
+use caesar_core::relay::appstate::AppState;
+use caesar_core::relay::server::download_info;
+use caesar_core::relay::server::download_success;
+use caesar_core::relay::server::upload_info;
+use caesar_core::relay::server::ws_handler;
+use shuttle_axum::ShuttleAxum;
+
+#[shuttle_runtime::main]
+async fn axum() -> ShuttleAxum {
+    // Create a new server data structure.
+    let appstate = AppState::new();
+
+    // Set up the application routes.
+    let app = Router::new()
+        .route("/ws", get(ws_handler))
+        .route("/upload", put(upload_info))
+        .route("/download/:name", get(download_info))
+        .route("/download_success/:name", post(download_success))
+        .with_state(appstate)
+        .layer(SecureClientIpSource::ConnectInfo.into_extension());
+
+    Ok(app.into())
+}