async def _memo(ctx, w: bytearray, msg: StellarSignTx):
if msg.memo_type is None:
msg.memo_type = consts.MEMO_TYPE_NONE
writers.write_uint32(w, msg.memo_type)
if msg.memo_type == consts.MEMO_TYPE_NONE:
# nothing is serialized
memo_confirm_text = ""
elif msg.memo_type == consts.MEMO_TYPE_TEXT:
# Text: 4 bytes (size) + up to 28 bytes
if len(msg.memo_text) > 28:
raise ProcessError(
"Stellar: max length of a memo text is 28 bytes")
writers.write_string(w, msg.memo_text)
memo_confirm_text = msg.memo_text
elif msg.memo_type == consts.MEMO_TYPE_ID:
# ID: 64 bit unsigned integer
writers.write_uint64(w, msg.memo_id)
memo_confirm_text = str(msg.memo_id)
elif msg.memo_type in (consts.MEMO_TYPE_HASH, consts.MEMO_TYPE_RETURN):
# Hash/Return: 32 byte hash
writers.write_bytes_unchecked(w, bytearray(msg.memo_hash))
memo_confirm_text = hexlify(msg.memo_hash).decode()
else:
raise ProcessError("Stellar invalid memo type")
await layout.require_confirm_memo(ctx, msg.memo_type, memo_confirm_text)
def serialize_manage_offer_op(w, msg: StellarManageOfferOp):
_serialize_asset(w, msg.selling_asset)
_serialize_asset(w, msg.buying_asset)
writers.write_uint64(w, msg.amount) # amount to sell
writers.write_uint32(w, msg.price_n) # numerator
writers.write_uint32(w, msg.price_d) # denominator
writers.write_uint64(w, msg.offer_id)
def _timebounds(w: bytearray, start: int, end: int):
# timebounds are only present if timebounds_start or timebounds_end is non-zero
if start or end:
writers.write_bool(w, True)
# timebounds are sent as uint32s since that's all we can display, but they must be hashed as 64bit
writers.write_uint64(w, start)
writers.write_uint64(w, end)
else:
writers.write_bool(w, False)
def serialize_path_payment_op(w, msg: StellarPathPaymentOp):
_serialize_asset(w, msg.send_asset)
writers.write_uint64(w, msg.send_max)
writers.write_pubkey(w, msg.destination_account)
_serialize_asset(w, msg.destination_asset)
writers.write_uint64(w, msg.destination_amount)
writers.write_uint32(w, len(msg.paths))
for p in msg.paths:
_serialize_asset(w, p)
async def _timebounds(ctx, w: bytearray, start: int, end: int):
# timebounds are only present if timebounds_start or timebounds_end is non-zero
if start or end:
# confirm dialog
await layout.require_confirm_timebounds(ctx, start, end)
writers.write_bool(w, True)
# timebounds are sent as uint32s since that's all we can display, but they must be hashed as 64bit
writers.write_uint64(w, start or 0)
writers.write_uint64(w, end or 0)
else:
writers.write_bool(w, False)
async def _init(ctx, w: bytearray, pubkey: bytes, msg: StellarSignTx):
network_passphrase_hash = sha256(msg.network_passphrase).digest()
writers.write_bytes(w, network_passphrase_hash)
writers.write_bytes(w, consts.TX_TYPE)
address = helpers.address_from_public_key(pubkey)
writers.write_pubkey(w, address)
if helpers.public_key_from_address(msg.source_account) != pubkey:
raise ProcessError("Stellar: source account does not match address_n")
writers.write_uint32(w, msg.fee)
writers.write_uint64(w, msg.sequence_number)
# confirm init
await layout.require_confirm_init(ctx, address, msg.network_passphrase)
async def _init(ctx, w: bytearray, pubkey: bytes, msg: StellarSignTx):
network_passphrase_hash = sha256(msg.network_passphrase).digest()
writers.write_bytes_unchecked(w, network_passphrase_hash)
writers.write_bytes_unchecked(w, consts.TX_TYPE)
address = helpers.address_from_public_key(pubkey)
accounts_match = msg.source_account == address
writers.write_pubkey(w, msg.source_account)
writers.write_uint32(w, msg.fee)
writers.write_uint64(w, msg.sequence_number)
# confirm init
await layout.require_confirm_init(ctx, msg.source_account,
msg.network_passphrase, accounts_match)
def serialize_payment_op(w, msg: StellarPaymentOp):
writers.write_pubkey(w, msg.destination_account)
_serialize_asset(w, msg.asset)
writers.write_uint64(w, msg.amount)
def serialize_create_passive_offer_op(w, msg: StellarCreatePassiveOfferOp):
_serialize_asset(w, msg.selling_asset)
_serialize_asset(w, msg.buying_asset)
writers.write_uint64(w, msg.amount)
writers.write_uint32(w, msg.price_n)
writers.write_uint32(w, msg.price_d)
def serialize_create_account_op(w, msg: StellarCreateAccountOp):
writers.write_pubkey(w, msg.new_account)
writers.write_uint64(w, msg.starting_balance)
def serialize_change_trust_op(w, msg: StellarChangeTrustOp):
_serialize_asset(w, msg.asset)
writers.write_uint64(w, msg.limit)
def serialize_bump_sequence_op(w, msg: StellarBumpSequenceOp):
writers.write_uint64(w, msg.bump_to)
