Implemented basic support for prelogin and notification negotiation

src/api/notifications.rs

@@ -0,0 +1,31 @@
+use rocket::Route;
+use rocket_contrib::Json;
+
+use db::DbConn;
+use api::JsonResult;
+use auth::Headers;
+
+pub fn routes() -> Vec<Route> {
+    routes![negotiate]
+}
+
+#[post("/hub/negotiate")]
+fn negotiate(_headers: Headers, _conn: DbConn) -> JsonResult {
+    use data_encoding::BASE64URL;
+    use crypto;
+
+    // Store this in db?
+    let conn_id = BASE64URL.encode(&crypto::get_random(vec![0u8; 16]));
+
+    // TODO: Implement transports
+    // Rocket WS support: https://github.com/SergioBenitez/Rocket/issues/90
+    // Rocket SSE support: https://github.com/SergioBenitez/Rocket/issues/33
+    Ok(Json(json!({
+        "connectionId": conn_id,
+        "availableTransports":[
+                // {"transport":"WebSockets", "transferFormats":["Text","Binary"]},
+                // {"transport":"ServerSentEvents", "transferFormats":["Text"]},
+                // {"transport":"LongPolling", "transferFormats":["Text","Binary"]}
+        ]
+    })))
+}