feat: WebSocket upgrader, hub, send, broadcast, handler con tests (issue 0011 fase 3-4)

functions/infra/ws_upgrader.go

@@ -0,0 +1,36 @@
+package infra
+
+import (
+	"fmt"
+	"net/http"
+
+	"nhooyr.io/websocket"
+)
+
+// WSUpgrader hace el upgrade de una conexion HTTP a WebSocket usando nhooyr.io/websocket.
+// Si origins contiene "*" se acepta cualquier origen (InsecureSkipVerify=true).
+// En caso contrario, OriginPatterns valida el header Origin del cliente con filepath.Match.
+// Retorna el *websocket.Conn listo para Read/Write o un error si el handshake falla.
+func WSUpgrader(w http.ResponseWriter, r *http.Request, origins []string) (*websocket.Conn, error) {
+	opts := &websocket.AcceptOptions{}
+
+	allowAny := false
+	for _, o := range origins {
+		if o == "*" {
+			allowAny = true
+			break
+		}
+	}
+
+	if allowAny {
+		opts.InsecureSkipVerify = true
+	} else {
+		opts.OriginPatterns = origins
+	}
+
+	conn, err := websocket.Accept(w, r, opts)
+	if err != nil {
+		return nil, fmt.Errorf("ws upgrade: %w", err)
+	}
+	return conn, nil
+}