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trampoline: fix two bugs preventing legacy payments to

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Electrum clients that have non-trampoline channels.

 - if an invoice supports trampoline, but provides only
non-trampoline nodes in its routing hints, we must use
a legacy trampoline payment

 - when we create a trampoline onion for a legacy payment,
the invoice_features field is a u64, so we need to remove
high feature bits.
This commit is contained in:
ThomasV
2023-08-27 11:48:19 +02:00
parent b2053c68f1
commit 40c08d350f
1 changed files with 4 additions and 1 deletions
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5
electrum/trampoline.py
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@@ -121,7 +121,8 @@ def is_legacy_relay(invoice_features, r_tags) -> Tuple[bool, Set[bytes]]:
singlehop_r_tags = [x for x in r_tags if len(x) == 1]
invoice_trampolines = [x[0][0] for x in singlehop_r_tags if is_hardcoded_trampoline(x[0][0])]
invoice_trampolines = set(invoice_trampolines)
return False, invoice_trampolines
if invoice_trampolines:
return False, invoice_trampolines
# if trampoline receiving is not supported or the forwarder is not known as a trampoline,
# we send a legacy payment
return True, set()
@@ -212,6 +213,8 @@ def create_trampoline_route(
# the last trampoline onion must contain routing hints for the last trampoline
# node to find the recipient
invoice_routing_info = encode_routing_info(r_tags)
# lnwire invoice_features for trampoline is u64
invoice_features = invoice_features & 0xffffffffffffffff
route[-1].invoice_routing_info = invoice_routing_info
route[-1].invoice_features = invoice_features
route[-1].outgoing_node_id = invoice_pubkey