def parse(byte_string):
scid, remainder, err = Namespace.pop_short_channel_id(byte_string)
if err:
return None, err
#print("scid: %s, remainder: %s\n" % (scid, remainder.hex()))
amt_to_forward, remainder, err = Namespace.pop_u64(remainder)
if err:
return None, err
#print("amt: %s, remainder: %s\n" % (amt_to_forward, remainder.hex()))
outgoing_cltv_value, remainder, err = Namespace.pop_u32(remainder)
if err:
return None, err
#print("outgoing: %s, remainder: %s\n" % (outgoing_cltv_value,
# remainder.hex()))
padding, remainder, err = Namespace.pop_bytes(12, remainder)
if err:
return None, err
#print("padding %s, remainder: %s\n" % (padding, remainder.hex()))
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {
'format': 'legacy',
'short_channel_id': scid,
'amt_to_forward': amt_to_forward,
'outgoing_cltv_value': outgoing_cltv_value,
'padding': padding
}, None
def parse_fixed(byte_string):
if len(byte_string) != ONION_BYTE_LENGTH:
return None, "onion is the wrong length"
version, remainder, err = Namespace.pop_u8(byte_string)
if err:
return None, "could not pop version byte"
if version != 0:
return None, "unsupported onion packet version"
public_key, remainder, err = Namespace.pop_point(remainder)
if err:
return None, "could not pop public key: %s" % err
hop_payloads, remainder, err = Namespace.pop_bytes(HOP_PAYLOADS_LENGTH,
remainder)
if err:
return None, "could not pop hops_payloads: %s" % err
hmac, remainder, err = Namespace.pop_bytes(HMAC_LENGTH, remainder)
if err:
return None, "could not pop hmac: %s" % err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
# TODO Check hmac for validity, need assocdata
return {'version': version,
'public_key': public_key,
'hop_payloads': hop_payloads,
'hmac': hmac}, None
def encode(short_channel_id, amt_to_forward, outgoing_cltv_value):
encoded_version = Namespace.encode_u8(0)
encoded_scid = Namespace.encode_short_channel_id(short_channel_id)
encoded_amt = Namespace.encode_u64(amt_to_forward)
encoded_outgoing = Namespace.encode_u32(outgoing_cltv_value)
padding = 12 * Namespace.encode_u8(0)
return (encoded_version + encoded_scid + encoded_amt +
encoded_outgoing + padding)
def parse_payment_data(tlv):
payment_secret, remainder, err = Namespace.pop_bytes(32, tlv.v)
if err:
return None, err
total_msat, remainder, err = Namespace.pop_tu64(
len(remainder), remainder)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {
'tlv_type_name': 'payment_data',
'payment_secret': payment_secret,
'total_msat': total_msat
}, None
def parse_tlv2(self, tlv):
cltv_expiry, remainder, err = Namespace.pop_tu32(tlv.l, tlv.v)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {'tlv_type_name': "tlv2", 'cltv_expiry': cltv_expiry}, None
def parse_art_no(tlv):
art_no, remainder, err = Namespace.pop_tu16(tlv.l, tlv.v)
if err:
return None, err
if len(remainder) > 0:
return None, "unexpected extra bytes"
return {'tlv_type_name': "bannerpunk_art_no", 'art_no': art_no}, None
def parse_tlv1(self, tlv):
amount_msat, remainder, err = Namespace.pop_tu64(tlv.l, tlv.v)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {'tlv_type_name': "tlv1", 'amount_msat': amount_msat}, None
def parse(self, byte_string):
tlv_parsers = {
1: self.parse_tlv1,
2: self.parse_tlv2,
3: self.parse_tlv3,
254: self.parse_tlv4
}
return Namespace.parse(byte_string, tlv_parsers)
def parse_tlv4(self, tlv):
print("parsing tlv4: %s" % tlv)
cltv_delta, remainder, err = Namespace.pop_u16(tlv.v)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {'tlv_type_name': "tlv4", 'cltv_delta': cltv_delta}, None
def parse_tlv3(self, tlv):
print("parsing tlv3: %s" % tlv)
node_id, remainder, err = Namespace.pop_point(tlv.v)
if err:
return None, err
amount_msat_1, remainder, err = Namespace.pop_u64(remainder)
if err:
return None, err
amount_msat_2, remainder, err = Namespace.pop_u64(remainder)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {
'tlv_type_name': "tlv3",
'node_id': node_id,
'amount_msat_1': amount_msat_1,
'amount_msat_2': amount_msat_2
}, None
def parse_short_channel_id(tlv):
scid, remainder, err = Namespace.pop_short_channel_id(tlv.v)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {
'tlv_type_name': 'short_channel_id',
'short_channel_id': scid
}, None
def parse_outgoing_cltv_value(tlv):
outgoing_cltv_value, remainder, err = Namespace.pop_tu32(tlv.l, tlv.v)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {
'tlv_type_name': 'outgoing_cltv_value',
'outgoing_cltv_value': outgoing_cltv_value
}, None
def parse_amt_to_forward(tlv):
amt_to_forward, remainder, err = Namespace.pop_tu64(tlv.l, tlv.v)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {
'tlv_type_name': 'amt_to_forward',
'amt_to_forward': amt_to_forward
}, None
def parse_pixels(tlv):
pixels = []
if tlv.l % 5 != 0:
return None, "unexpected length"
remainder = tlv.v
while len(remainder) > 0:
pixel_hex, remainder, err = Namespace.pop_bytes(5, remainder)
if err:
return None, err
pixels.append(Pixel.from_bin(h2b(pixel_hex)))
return {'tlv_type_name': "bannerpunk_pixels", 'pixels': pixels}, None
def parse_tlv2(self, tlv):
print("parsing tlv2: %s" % tlv)
short_channel_id, remainder, err = Namespace.pop_short_channel_id(
tlv.v)
if err:
return None, err
if len(remainder) != 0:
return None, "unexpected remaining bytes"
return {
'tlv_type_name': "tlv2",
'short_channel_id': short_channel_id
}, None
def parse(byte_string, extension_parsers=None):
tlv_parsers = {
2: TlvHopPayload.parse_amt_to_forward,
4: TlvHopPayload.parse_outgoing_cltv_value,
6: TlvHopPayload.parse_short_channel_id,
8: TlvHopPayload.parse_payment_data
}
if extension_parsers:
tlv_parsers.update(extension_parsers)
parsed, err = Namespace.parse(byte_string, tlv_parsers)
if err:
print("err 123: %s" % err)
return None, err
return {'format': 'tlv', 'tlvs': parsed}, None
def encode_outgoing_cltv_value(outgoing_cltv_value):
return Tlv(4, Namespace.encode_tu32(outgoing_cltv_value)).encode()
def parse(self, byte_string):
tlv_parsers = {0: self.parse_tlv1, 11: self.parse_tlv2}
return Namespace.parse(byte_string, tlv_parsers)
def encode_short_channel_id(short_channel_id):
t = Tlv(6, Namespace.encode_short_channel_id(short_channel_id))
return t.encode()
def encode_payment_data(payment_secret, total_msat):
body = (Namespace.encode_bytes(payment_secret) +
Namespace.encode_tu64(total_msat))
return Tlv(8, body).encode()
def _encode_art_no(art_no):
encoded = Namespace.encode_tu16(art_no)
return Tlv(ART_TLV_TYPE, encoded).encode()
def encode_amt_to_forward(amt_to_forward):
return Tlv(2, Namespace.encode_tu64(amt_to_forward)).encode()
