From 338adf05bad3f39b16d9e1d9f531c4e05b965756 Mon Sep 17 00:00:00 2001
From: SomberNight <somber.night@protonmail.com>
Date: Wed, 27 Jan 2021 20:14:55 +0100
Subject: [PATCH] interface.get_transaction: stricter sanitisation

in particular, Transaction.__init__ allows leading/trailing whitespaces
---
 electrum/interface.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/electrum/interface.py b/electrum/interface.py
index 42c38b223..4d6cfc7ad 100644
--- a/electrum/interface.py
+++ b/electrum/interface.py
@@ -917,6 +917,8 @@ class Interface(Logger):
             raise Exception(f"{repr(tx_hash)} is not a txid")
         raw = await self.session.send_request('blockchain.transaction.get', [tx_hash], timeout=timeout)
         # validate response
+        if not is_hex_str(raw):
+            raise RequestCorrupted(f"received garbage (non-hex) as tx data (txid {tx_hash}): {raw!r}")
         tx = Transaction(raw)
         try:
             tx.deserialize()  # see if raises