def test_escrow_abort(self, fulfillment_sha256, fulfillment_ed25519):
ilp_fulfillment_sha = Fulfillment.from_uri(
fulfillment_sha256['fulfillment_uri'])
ilp_fulfillment_ed = Fulfillment.from_uri(
fulfillment_ed25519['fulfillment_uri'])
time_sleep = 0
fulfillment_escrow = ThresholdSha256Fulfillment(threshold=1)
fulfillment_timeout = TimeoutFulfillment(
expire_time=str(float(timestamp()) + time_sleep))
fulfillment_timeout_inverted = InvertedThresholdSha256Fulfillment(
threshold=1)
fulfillment_timeout_inverted.add_subfulfillment(fulfillment_timeout)
# do not fulfill execute branch
fulfillment_and_execute = ThresholdSha256Fulfillment(threshold=2)
fulfillment_and_execute.add_subcondition(ilp_fulfillment_ed.condition)
fulfillment_and_execute.add_subfulfillment(fulfillment_timeout)
fulfillment_and_abort = ThresholdSha256Fulfillment(threshold=2)
fulfillment_and_abort.add_subfulfillment(ilp_fulfillment_sha)
fulfillment_and_abort.add_subfulfillment(fulfillment_timeout_inverted)
fulfillment_escrow.add_subfulfillment(fulfillment_and_execute)
fulfillment_escrow.add_subfulfillment(fulfillment_and_abort)
# out-of-time validation
assert fulfillment_escrow.validate(MESSAGE, now=timestamp()) is True
def test_weights(self, fulfillment_ed25519):
ilp_fulfillment = Fulfillment.from_uri(
fulfillment_ed25519['fulfillment_uri'])
fulfillment1 = ThresholdSha256Fulfillment(threshold=2)
fulfillment1.add_subfulfillment(ilp_fulfillment, weight=2)
parsed_fulfillment1 = fulfillment1.from_dict(fulfillment1.to_dict())
assert parsed_fulfillment1.condition.serialize_uri(
) == fulfillment1.condition.serialize_uri()
assert parsed_fulfillment1.to_dict() == fulfillment1.to_dict()
assert parsed_fulfillment1.subconditions[0]['weight'] == 2
assert parsed_fulfillment1.validate(MESSAGE) is True
fulfillment2 = ThresholdSha256Fulfillment(threshold=3)
fulfillment2.add_subfulfillment(ilp_fulfillment, weight=2)
parsed_fulfillment2 = fulfillment1.from_dict(fulfillment2.to_dict())
assert parsed_fulfillment2.subconditions[0]['weight'] == 2
assert parsed_fulfillment2.validate(MESSAGE) is False
fulfillment3 = ThresholdSha256Fulfillment(threshold=3)
fulfillment3.add_subfulfillment(ilp_fulfillment, weight=3)
parsed_fulfillment3 = fulfillment1.from_dict(fulfillment3.to_dict())
assert parsed_fulfillment3.condition.serialize_uri(
) == fulfillment3.condition.serialize_uri()
assert not (fulfillment3.condition.serialize_uri()
== fulfillment1.condition.serialize_uri())
assert parsed_fulfillment3.validate(MESSAGE) is True
fulfillment4 = ThresholdSha256Fulfillment(threshold=2)
with pytest.raises(ValueError):
fulfillment4.add_subfulfillment(ilp_fulfillment, weight=-2)
def test_serialize_condition_and_validate_fulfillment(
self, fulfillment_sha256, fulfillment_ed25519,
fulfillment_threshold):
ilp_fulfillment_ed25519 = Fulfillment.from_uri(
fulfillment_ed25519['fulfillment_uri'])
ilp_fulfillment_sha = Fulfillment.from_uri(
fulfillment_sha256['fulfillment_uri'])
assert ilp_fulfillment_ed25519.validate(MESSAGE) == True
assert ilp_fulfillment_sha.validate(MESSAGE) == True
threshold = 1
# Create a threshold condition
fulfillment = ThresholdSha256Fulfillment(threshold=threshold)
fulfillment.add_subfulfillment(ilp_fulfillment_ed25519)
fulfillment.add_subfulfillment(ilp_fulfillment_sha)
assert fulfillment.condition.serialize_uri(
) == fulfillment_threshold['condition_uri']
# Note: If there are more than enough fulfilled subconditions, shorter
# fulfillments will be chosen over longer ones.
# thresholdFulfillmentUri.length === 65
assert fulfillment.serialize_uri(
) == fulfillment_threshold['fulfillment_uri']
assert fulfillment.validate(MESSAGE)
def create_asset(vw_sk, vw_pk, vehicle_id, data, metadata):
# Create asset VW -> [VW, TEL]
# Custom crypto condition multisig 1-2
threshold_fulfillment = ThresholdSha256Fulfillment(threshold=1)
vw_fulfillment = Ed25519Fulfillment(public_key=vw_pk)
tel_fulfillment = Ed25519Fulfillment(public_key=vehicle_id)
threshold_fulfillment.add_subfulfillment(vw_fulfillment)
threshold_fulfillment.add_subfulfillment(tel_fulfillment)
output = {
'amount': 1,
'condition': {
'details': threshold_fulfillment.to_dict(),
'uri': threshold_fulfillment.condition.serialize_uri()
},
'public_keys': [vw_pk, vehicle_id]
}
# Create the transaction
tx_create = Transaction.create([vw_pk], [([vw_pk, vehicle_id], 1)],
asset=data,
metadata=metadata)
# Override the condition we our custom build one
tx_create.outputs[0] = Output.from_dict(output)
# Sign the transaction
tx_create_signed = tx_create.sign([vw_sk])
return tx_create_signed
def test_serialize_deserialize_fulfillment(self, fulfillment_ed25519):
ilp_fulfillment = Fulfillment.from_uri(
fulfillment_ed25519['fulfillment_uri'])
num_fulfillments = 20
threshold = ceil(num_fulfillments * 2 / 3)
# Create a threshold condition
fulfillment = ThresholdSha256Fulfillment(threshold=threshold)
for i in range(num_fulfillments):
fulfillment.add_subfulfillment(ilp_fulfillment)
fulfillment_uri = fulfillment.serialize_uri()
assert fulfillment.validate(MESSAGE)
deserialized_fulfillment = Fulfillment.from_uri(fulfillment_uri)
assert isinstance(deserialized_fulfillment, ThresholdSha256Fulfillment)
assert deserialized_fulfillment.threshold == threshold
assert len([
f for f in deserialized_fulfillment.subconditions
if f['type'] == 'fulfillment'
]) == threshold
assert len(deserialized_fulfillment.subconditions) == num_fulfillments
assert deserialized_fulfillment.serialize_uri() == fulfillment_uri
assert deserialized_fulfillment.validate(MESSAGE)
def test_fulfillment_nested_and_or(self, fulfillment_sha256,
fulfillment_ed25519,
fulfillment_threshold_nested_and_or):
ilp_fulfillment_sha = Fulfillment.from_uri(
fulfillment_sha256['fulfillment_uri'])
ilp_fulfillment_ed = Fulfillment.from_uri(
fulfillment_ed25519['fulfillment_uri'])
# 2-of-2 (AND with 2 inputs)
fulfillment = ThresholdSha256Fulfillment(threshold=2)
fulfillment.add_subfulfillment(ilp_fulfillment_sha)
assert fulfillment.validate(MESSAGE) is False
# 1-of-2 (OR with 2 inputs)
nested_fulfillment = ThresholdSha256Fulfillment(threshold=1)
nested_fulfillment.add_subfulfillment(ilp_fulfillment_ed)
assert nested_fulfillment.validate(MESSAGE) is True
nested_fulfillment.add_subfulfillment(ilp_fulfillment_ed)
assert nested_fulfillment.validate(MESSAGE) is True
fulfillment.add_subfulfillment(nested_fulfillment)
assert fulfillment.validate(MESSAGE) is True
fulfillment_uri = fulfillment.serialize_uri()
assert fulfillment.condition_uri == fulfillment_threshold_nested_and_or[
'condition_uri']
assert fulfillment_uri == fulfillment_threshold_nested_and_or[
'fulfillment_uri']
print(fulfillment_uri)
deserialized_fulfillment = Fulfillment.from_uri(fulfillment_uri)
condition_uri = fulfillment.condition.serialize_uri()
deserialized_condition = Condition.from_uri(condition_uri)
assert isinstance(deserialized_fulfillment, ThresholdSha256Fulfillment)
assert deserialized_fulfillment.threshold == 2
assert len(deserialized_fulfillment.subconditions) == 2
assert len(deserialized_fulfillment.subconditions[1]
['body'].subconditions) == 2
assert deserialized_fulfillment.serialize_uri() == fulfillment_uri
assert deserialized_fulfillment.validate(MESSAGE)
assert deserialized_condition.serialize_uri() == condition_uri
vk = ilp_fulfillment_ed.public_key.encode(encoding='base58')
assert len(fulfillment.get_subcondition_from_vk(vk)) == 2
assert len(deserialized_fulfillment.get_subcondition_from_vk(vk)) == 1
def user_user2_threshold(user_pub, user2_pub):
from cryptoconditions import (ThresholdSha256Fulfillment,
Ed25519Fulfillment)
user_pub_keys = [user_pub, user2_pub]
threshold = ThresholdSha256Fulfillment(threshold=len(user_pub_keys))
for user_pub in user_pub_keys:
threshold.add_subfulfillment(Ed25519Fulfillment(public_key=user_pub))
return threshold
def add_nested_fulfillment(parent, current_depth=0):
current_depth += 1
child = ThresholdSha256Fulfillment(threshold=1)
if current_depth < max_depth:
add_nested_fulfillment(child, current_depth)
else:
child.add_subfulfillment(ilp_fulfillment_ed1)
parent.add_subfulfillment(child)
return parent
def test_generate_conditions_split_half_single_owner(user_pub, user2_pub,
user3_pub):
from bigchaindb_common.transaction import Condition
from cryptoconditions import Ed25519Fulfillment, ThresholdSha256Fulfillment
expected_simple1 = Ed25519Fulfillment(public_key=user_pub)
expected_simple2 = Ed25519Fulfillment(public_key=user2_pub)
expected_simple3 = Ed25519Fulfillment(public_key=user3_pub)
expected = ThresholdSha256Fulfillment(threshold=2)
expected_threshold = ThresholdSha256Fulfillment(threshold=2)
expected_threshold.add_subfulfillment(expected_simple2)
expected_threshold.add_subfulfillment(expected_simple3)
expected.add_subfulfillment(expected_threshold)
expected.add_subfulfillment(expected_simple1)
cond = Condition.generate([[expected_simple2, user3_pub], user_pub])
assert cond.fulfillment.to_dict() == expected.to_dict()
def test_deserialize_unsigned_dict_to_fulfillment(self, vk_ilp):
fulfillment = ThresholdSha256Fulfillment(threshold=1)
fulfillment.add_subfulfillment(
Ed25519Fulfillment(public_key=VerifyingKey(vk_ilp['b58'])))
fulfillment.add_subfulfillment(
Ed25519Fulfillment(public_key=VerifyingKey(vk_ilp['b58'])))
parsed_fulfillment = fulfillment.from_dict(fulfillment.to_dict())
assert parsed_fulfillment.condition.serialize_uri(
) == fulfillment.condition.serialize_uri()
assert parsed_fulfillment.to_dict() == fulfillment.to_dict()
def test_generate_conditions_split_half_recursive_custom_threshold(user_pub,
user2_pub,
user3_pub):
from bigchaindb_common.transaction import Condition
from cryptoconditions import Ed25519Fulfillment, ThresholdSha256Fulfillment
expected_simple1 = Ed25519Fulfillment(public_key=user_pub)
expected_simple2 = Ed25519Fulfillment(public_key=user2_pub)
expected_simple3 = Ed25519Fulfillment(public_key=user3_pub)
expected = ThresholdSha256Fulfillment(threshold=1)
expected.add_subfulfillment(expected_simple1)
expected_threshold = ThresholdSha256Fulfillment(threshold=1)
expected_threshold.add_subfulfillment(expected_simple2)
expected_threshold.add_subfulfillment(expected_simple3)
expected.add_subfulfillment(expected_threshold)
cond = Condition.generate(([user_pub, ([user2_pub, expected_simple3], 1)],
1))
assert cond.fulfillment.to_dict() == expected.to_dict()
def generate(cls, owners_after):
"""Generates a Condition from a specifically formed tuple or list.
Note:
If a ThresholdCondition has to be generated where the threshold
is always the number of subconditions it is split between, a
list of the following structure is sufficient:
[(address|condition)*, [(address|condition)*, ...], ...]
If however, the thresholds of individual threshold conditions
to be created have to be set specifically, a tuple of the
following structure is necessary:
([(address|condition)*,
([(address|condition)*, ...], subthreshold),
...], threshold)
Args:
owners_after (:obj:`list` of :obj:`str`|tuple): The users that
should be able to fulfill the Condition that is being
created.
Returns:
A Condition that can be used in a Transaction.
Returns:
TypeError: If `owners_after` is not an instance of `list`.
TypeError: If `owners_after` is an empty list.
"""
# TODO: We probably want to remove the tuple logic for weights here
# again:
# github.com/bigchaindb/bigchaindb/issues/730#issuecomment-255144756
if isinstance(owners_after, tuple):
owners_after, threshold = owners_after
else:
threshold = len(owners_after)
if not isinstance(owners_after, list):
raise TypeError('`owners_after` must be an instance of list')
if len(owners_after) == 0:
raise ValueError('`owners_after` needs to contain at least one'
'owner')
elif len(owners_after) == 1 and not isinstance(owners_after[0], list):
try:
ffill = Ed25519Fulfillment(public_key=owners_after[0])
except TypeError:
ffill = owners_after[0]
return cls(ffill, owners_after)
else:
initial_cond = ThresholdSha256Fulfillment(threshold=threshold)
threshold_cond = reduce(cls._gen_condition, owners_after,
initial_cond)
return cls(threshold_cond, owners_after)
def test_generate_threshold_condition_with_hashlock(user_pub, user2_pub,
user3_pub):
from bigchaindb_common.transaction import Condition
from cryptoconditions import (PreimageSha256Fulfillment,
Ed25519Fulfillment,
ThresholdSha256Fulfillment)
secret = b'much secret, wow'
hashlock = PreimageSha256Fulfillment(preimage=secret)
expected_simple1 = Ed25519Fulfillment(public_key=user_pub)
expected_simple3 = Ed25519Fulfillment(public_key=user3_pub)
expected = ThresholdSha256Fulfillment(threshold=2)
expected_sub = ThresholdSha256Fulfillment(threshold=2)
expected_sub.add_subfulfillment(expected_simple1)
expected_sub.add_subfulfillment(hashlock)
expected.add_subfulfillment(expected_simple3)
cond = Condition.generate([[user_pub, hashlock], expected_simple3])
assert cond.fulfillment.to_dict() == expected.to_dict()
def test_serialize_condition_and_validate_fulfillment(
self, fulfillment_sha256, fulfillment_ed25519):
ilp_fulfillment_sha = Fulfillment.from_uri(
fulfillment_sha256['fulfillment_uri'])
ilp_fulfillment_ed = Fulfillment.from_uri(
fulfillment_ed25519['fulfillment_uri'])
fulfillment_escrow = ThresholdSha256Fulfillment(threshold=1)
fulfillment_timeout = TimeoutFulfillment(
expire_time=str(float(timestamp()) + 1000))
fulfillment_timeout_inverted = InvertedThresholdSha256Fulfillment(
threshold=1)
fulfillment_timeout_inverted.add_subfulfillment(fulfillment_timeout)
fulfillment_and_execute = ThresholdSha256Fulfillment(threshold=2)
fulfillment_and_execute.add_subfulfillment(ilp_fulfillment_ed)
fulfillment_and_execute.add_subfulfillment(fulfillment_timeout)
assert fulfillment_and_execute.validate(MESSAGE,
now=timestamp()) is True
fulfillment_and_abort = ThresholdSha256Fulfillment(threshold=2)
fulfillment_and_abort.add_subfulfillment(ilp_fulfillment_sha)
fulfillment_and_abort.add_subfulfillment(fulfillment_timeout_inverted)
# timeout has not occured (over about 1000 seconds)
assert fulfillment_and_abort.validate(MESSAGE,
now=timestamp()) is False
fulfillment_escrow.add_subfulfillment(fulfillment_and_execute)
fulfillment_escrow.add_subfulfillment(fulfillment_and_abort)
parsed_fulfillment = fulfillment_escrow.from_dict(
fulfillment_escrow.to_dict())
assert parsed_fulfillment.condition_uri == fulfillment_escrow.condition_uri
assert parsed_fulfillment.serialize_uri(
) == fulfillment_escrow.serialize_uri()
assert parsed_fulfillment.validate(MESSAGE, now=timestamp()) is True
def test_generate_conditions_flat_ownage(user_pub, user2_pub, user3_pub):
from bigchaindb_common.transaction import Condition
from cryptoconditions import Ed25519Fulfillment, ThresholdSha256Fulfillment
expected_simple1 = Ed25519Fulfillment(public_key=user_pub)
expected_simple2 = Ed25519Fulfillment(public_key=user2_pub)
expected_simple3 = Ed25519Fulfillment(public_key=user3_pub)
expected = ThresholdSha256Fulfillment(threshold=3)
expected.add_subfulfillment(expected_simple1)
expected.add_subfulfillment(expected_simple2)
expected.add_subfulfillment(expected_simple3)
cond = Condition.generate([user_pub, user2_pub, expected_simple3])
assert cond.fulfillment.to_dict() == expected.to_dict()
def _gen_condition(cls, initial, current):
"""Generates ThresholdSha256 conditions from a list of new owners.
Note:
This method is intended only to be used with a reduce function.
For a description on how to use this method, see
`Condition.generate`.
Args:
initial (:class:`cryptoconditions.ThresholdSha256Fulfillment`):
A Condition representing the overall root.
current (:obj:`list` of :obj:`str`|str): A list of new owners
or a single new owner.
Returns:
:class:`cryptoconditions.ThresholdSha256Fulfillment`:
"""
if isinstance(current, tuple):
owners_after, threshold = current
else:
owners_after = current
try:
threshold = len(owners_after)
except TypeError:
threshold = None
if isinstance(owners_after, list) and len(owners_after) > 1:
ffill = ThresholdSha256Fulfillment(threshold=threshold)
reduce(cls._gen_condition, owners_after, ffill)
elif isinstance(owners_after, list) and len(owners_after) <= 1:
raise ValueError('Sublist cannot contain single owner')
else:
try:
owners_after = owners_after.pop()
except AttributeError:
pass
try:
ffill = Ed25519Fulfillment(public_key=owners_after)
except TypeError:
# NOTE: Instead of submitting base58 encoded addresses, a user
# of this class can also submit fully instantiated
# Cryptoconditions. In the case of casting `owners_after`
# to a Ed25519Fulfillment with the result of a
# `TypeError`, we're assuming that `owners_after` is a
# Cryptocondition then.
ffill = owners_after
initial.add_subfulfillment(ffill)
return initial
def test_fulfillment_nested(
self,
fulfillment_sha256,
fulfillment_ed25519_2,
):
ilp_fulfillment_sha = Fulfillment.from_uri(
fulfillment_sha256['fulfillment_uri'])
ilp_fulfillment_ed1 = Fulfillment.from_uri(
fulfillment_ed25519_2['fulfillment_uri'])
# 2-of-2 (AND with 2 inputs)
fulfillment = ThresholdSha256Fulfillment(threshold=2)
fulfillment.add_subfulfillment(ilp_fulfillment_sha)
max_depth = 6
def add_nested_fulfillment(parent, current_depth=0):
current_depth += 1
child = ThresholdSha256Fulfillment(threshold=1)
if current_depth < max_depth:
add_nested_fulfillment(child, current_depth)
else:
child.add_subfulfillment(ilp_fulfillment_ed1)
parent.add_subfulfillment(child)
return parent
fulfillment = add_nested_fulfillment(fulfillment)
assert fulfillment.validate(MESSAGE) is True
assert len(fulfillment.subconditions) == 2
assert isinstance(fulfillment.subconditions[1]['body'],
ThresholdSha256Fulfillment)
assert isinstance(
fulfillment.subconditions[1]['body'].subconditions[0]['body'],
ThresholdSha256Fulfillment)
fulfillment_uri = fulfillment.serialize_uri()
deserialized_fulfillment = Fulfillment.from_uri(fulfillment_uri)
condition_uri = fulfillment.condition.serialize_uri()
deserialized_condition = Condition.from_uri(condition_uri)
assert deserialized_fulfillment.serialize_uri() == fulfillment_uri
assert deserialized_fulfillment.validate(MESSAGE) is True
assert deserialized_condition.serialize_uri() == condition_uri
def generate(cls, owners_after, amount):
"""Generates a Condition from a specifically formed tuple or list.
Note:
If a ThresholdCondition has to be generated where the threshold
is always the number of subconditions it is split between, a
list of the following structure is sufficient:
[(address|condition)*, [(address|condition)*, ...], ...]
Args:
owners_after (:obj:`list` of :obj:`str`): The public key of
the users that should be able to fulfill the Condition
that is being created.
amount (:obj:`int`): The amount locked by the condition.
Returns:
A Condition that can be used in a Transaction.
Raises:
TypeError: If `owners_after` is not an instance of `list`.
ValueError: If `owners_after` is an empty list.
"""
threshold = len(owners_after)
if not isinstance(amount, int):
raise TypeError('`amount` must be a int')
if amount < 1:
raise AmountError('`amount` needs to be greater than zero')
if not isinstance(owners_after, list):
raise TypeError('`owners_after` must be an instance of list')
if len(owners_after) == 0:
raise ValueError('`owners_after` needs to contain at least one'
'owner')
elif len(owners_after) == 1 and not isinstance(owners_after[0], list):
try:
ffill = Ed25519Fulfillment(public_key=owners_after[0])
except TypeError:
ffill = owners_after[0]
return cls(ffill, owners_after, amount=amount)
else:
initial_cond = ThresholdSha256Fulfillment(threshold=threshold)
threshold_cond = reduce(cls._gen_condition, owners_after,
initial_cond)
return cls(threshold_cond, owners_after, amount=amount)
def _gen_condition(cls, initial, new_public_keys):
"""Generates ThresholdSha256 conditions from a list of new owners.
Note:
This method is intended only to be used with a reduce function.
For a description on how to use this method, see
:meth:`~.Output.generate`.
Args:
initial (:class:`cryptoconditions.ThresholdSha256Fulfillment`):
A Condition representing the overall root.
new_public_keys (:obj:`list` of :obj:`str`|str): A list of new
owners or a single new owner.
Returns:
:class:`cryptoconditions.ThresholdSha256Fulfillment`:
"""
try:
threshold = len(new_public_keys)
except TypeError:
threshold = None
if isinstance(new_public_keys, list) and len(new_public_keys) > 1:
ffill = ThresholdSha256Fulfillment(threshold=threshold)
reduce(cls._gen_condition, new_public_keys, ffill)
elif isinstance(new_public_keys, list) and len(new_public_keys) <= 1:
raise ValueError('Sublist cannot contain single owner')
else:
try:
new_public_keys = new_public_keys.pop()
except AttributeError:
pass
try:
ffill = Ed25519Fulfillment(public_key=new_public_keys)
except TypeError:
# NOTE: Instead of submitting base58 encoded addresses, a user
# of this class can also submit fully instantiated
# Cryptoconditions. In the case of casting
# `new_public_keys` to a Ed25519Fulfillment with the
# result of a `TypeError`, we're assuming that
# `new_public_keys` is a Cryptocondition then.
ffill = new_public_keys
initial.add_subfulfillment(ffill)
return initial
def test_fulfillment_didnt_reach_threshold(self, vk_ilp,
fulfillment_ed25519):
ilp_fulfillment = Fulfillment.from_uri(
fulfillment_ed25519['fulfillment_uri'])
threshold = 10
# Create a threshold condition
fulfillment = ThresholdSha256Fulfillment(threshold=threshold)
for i in range(threshold - 1):
fulfillment.add_subfulfillment(ilp_fulfillment)
with pytest.raises(KeyError):
fulfillment.serialize_uri()
assert fulfillment.validate(MESSAGE) is False
fulfillment.add_subfulfillment(ilp_fulfillment)
fulfillment_uri = fulfillment.serialize_uri()
assert fulfillment.validate(MESSAGE)
deserialized_fulfillment = Fulfillment.from_uri(fulfillment_uri)
assert isinstance(deserialized_fulfillment, ThresholdSha256Fulfillment)
assert deserialized_fulfillment.threshold == threshold
assert len([
f for f in deserialized_fulfillment.subconditions
if f['type'] == 'fulfillment'
]) == threshold
assert len(deserialized_fulfillment.subconditions) == threshold
assert deserialized_fulfillment.serialize_uri() == fulfillment_uri
assert deserialized_fulfillment.validate(MESSAGE)
fulfillment.add_subfulfillment(
Ed25519Fulfillment(public_key=VerifyingKey(vk_ilp['b58'])))
assert fulfillment.validate(MESSAGE) == True
def test_serialize_unsigned_dict_to_fulfillment(self, vk_ilp):
fulfillment = ThresholdSha256Fulfillment(threshold=1)
fulfillment.add_subfulfillment(
Ed25519Fulfillment(public_key=VerifyingKey(vk_ilp['b58'])))
fulfillment.add_subfulfillment(
Ed25519Fulfillment(public_key=VerifyingKey(vk_ilp['b58'])))
assert fulfillment.to_dict() == \
{'bitmask': 41,
'subfulfillments': [{'bitmask': 32,
'public_key': 'Gtbi6WQDB6wUePiZm8aYs5XZ5pUqx9jMMLvRVHPESTjU',
'signature': None,
'type': 'fulfillment',
'type_id': 4,
'weight': 1},
{'bitmask': 32,
'public_key': 'Gtbi6WQDB6wUePiZm8aYs5XZ5pUqx9jMMLvRVHPESTjU',
'signature': None,
'type': 'fulfillment',
'type_id': 4,
'weight': 1}],
'threshold': 1,
'type': 'fulfillment',
'type_id': 2}
def create_transfer(prev_tx, vw_sk, vw_pk, vehicle_id, metadata, asset_id):
prev_tx = Transaction.from_dict(prev_tx)
# Create asset VW -> [VW, TEL]
# Custom crypto condition multisig 1-2
threshold_fulfillment = ThresholdSha256Fulfillment(threshold=1)
vw_fulfillment = Ed25519Fulfillment(public_key=vw_pk)
tel_fulfillment = Ed25519Fulfillment(public_key=vehicle_id)
threshold_fulfillment.add_subfulfillment(vw_fulfillment)
threshold_fulfillment.add_subfulfillment(tel_fulfillment)
output = {
'amount': 1,
'condition': {
'details': threshold_fulfillment.to_dict(),
'uri': threshold_fulfillment.condition.serialize_uri()
},
'public_keys': [vw_pk, vehicle_id],
}
# The yet to be fulfilled input:
input_ = {
'fulfillment': None,
'fulfills': {
'txid': prev_tx.id,
'output': 0,
},
'owners_before': [vw_pk, vehicle_id],
}
# Craft the payload:
transfer_tx = {
'operation': 'TRANSFER',
'asset': {
'id': asset_id
},
'metadata': metadata,
'outputs': [output],
'inputs': [input_],
'version': '0.9',
}
# Generate the id, by hashing the encoded json formatted string
# representation of the transaction:
json_str_tx = json.dumps(
transfer_tx,
sort_keys=True,
separators=(',', ':'),
ensure_ascii=False,
)
txid = sha3.sha3_256(json_str_tx.encode()).hexdigest()
transfer_tx['id'] = txid
# Sign the transaction:
message = json.dumps(
transfer_tx,
sort_keys=True,
separators=(',', ':'),
ensure_ascii=False,
)
threshold_fulfillment = ThresholdSha256Fulfillment(threshold=1)
vw_fulfillment.sign(message.encode(), private_key=Ed25519SigningKey(vw_sk))
threshold_fulfillment.add_subfulfillment(vw_fulfillment)
threshold_fulfillment.add_subcondition(tel_fulfillment.condition)
fulfillment_uri = threshold_fulfillment.serialize_uri()
transfer_tx['inputs'][0]['fulfillment'] = fulfillment_uri
return Transaction.from_dict(transfer_tx)
driver=bdb)
# instead of transfering to a simple public key we can craft
# custom cryptoconditions using thresholds, signatures, hashlocks, ...
# this example is a multisig between
#
# bob secret/hashlock
# carly \ /
# \ and
# \ /
# and
# |
# o
#
# the cryptocondition is added as an output
condition = ThresholdSha256Fulfillment(threshold=2)
condition.add_subfulfillment(
Ed25519Fulfillment(public_key=Ed25519VerifyingKey(carly.public_key)))
subfulfillment = ThresholdSha256Fulfillment(threshold=2)
subfulfillment.add_subcondition(
PreimageSha256Fulfillment(preimage=b'secret').condition)
subfulfillment.add_subfulfillment(
Ed25519Fulfillment(public_key=Ed25519VerifyingKey(bob.public_key)))
condition.add_subfulfillment(subfulfillment)
# create the transfer transaction with the custom condition
tx_transfer_custom_condition = prepare_transfer(
inputs=[{
'tx': tx_create_alice_divisible_signed,
'output': 0
}],
