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#!/usr/bin/env python3
"""Plugin that replaces HTLC payloads.
This feature is important if we want to accept an HTLC tlv field not
accepted by lightningd.
"""
from pyln.client import Plugin
plugin = Plugin()
@plugin.hook("htlc_accepted")
def on_htlc_accepted(htlc, onion, plugin, **kwargs):
# eg. '2902017b04016d0821fff5b6bd5018c8731aa0496c3698ef49f132ef9a3000c94436f4957e79a2f8827b'
# (but values change depending on pay's randomness!)
print("payload was:{}".format(onion['payload']))
assert onion['payload'][0:2] == '29'
if plugin.replace_payload == 'corrupt_secret':
# Note: we don't include length prefix in returned payload, since it doesn't
# support the pre-TLV legacy form.
if onion['payload'][18] == '0':
newpayload = onion['payload'][2:18] + '1' + onion['payload'][19:]
else:
newpayload = onion['payload'][2:18] + '0' + onion['payload'][19:]
else:
newpayload = plugin.replace_payload
print("payload was:{}".format(onion['payload']))
print("payload now:{}".format(newpayload))
return {'result': 'continue', 'payload': newpayload}
@plugin.method('setpayload')
def setpayload(plugin, payload: bytes):
plugin.replace_payload = payload
return {}
plugin.run()