feat: update apps/walletshield (v0.4.2)

Author: xendarboh

apps/walletshield/main.go

@@ -32,6 +32,9 @@ import (
 var (
 	timeout          = time.Second * 45
 	ProxyHTTPService = "http_proxy"
+
+	// Note: UserForwardPayloadLength should match the same value passed to genconfig.
+	UserForwardPayloadLength = 30000
 )
 
 func sendRequest(thin *thin.ThinClient, payload []byte) ([]byte, error) {
@@ -175,6 +178,15 @@ func (s *Server) Handler(w http.ResponseWriter, req *http.Request) {
 		panic(err)
 	}
 
+	// FIXME: resolve with multi-packet transimssion to transcend payload size limitation
+	// While better solution is developing, pre-emptively reject oversized payloads
+	size := len(blob)
+	if size > UserForwardPayloadLength {
+		s.log.Errorf("(WIP) Rejecting message with oversized payload: %d > %d bytes", size, UserForwardPayloadLength)
+		http.Error(w, "custom 500", http.StatusInternalServerError)
+		return
+	}
+
 	rawReply, err := sendRequest(s.thin, blob)
 	if err != nil {
 		s.log.Errorf("Failed to send message: %s", err)