def from_dict(cls, block_body):
"""Transform a Python dictionary to a Block object.
Args:
block_body (dict): A block dictionary to be transformed.
Returns:
:class:`~Block`
Raises:
InvalidHash: If the block's id is not corresponding to its
data.
"""
# Validate block id
block = block_body['block']
block_serialized = serialize(block)
block_id = hash_data(block_serialized)
if block_id != block_body['id']:
raise InvalidHash()
transactions = [
Transaction.from_dict(tx) for tx in block['transactions']
]
signature = block_body.get('signature')
return cls(transactions, block['node_pubkey'], block['timestamp'],
block['voters'], signature)
def from_dict(cls, block_body):
block = block_body['block']
block_serialized = serialize(block)
block_id = hash_data(block_serialized)
verifying_key = VerifyingKey(block['node_pubkey'])
try:
signature = block_body['signature']
except KeyError:
signature = None
if block_id != block_body['id']:
raise InvalidHash()
if signature is not None:
# NOTE: CC throws a `ValueError` on some wrong signatures
# https://github.com/bigchaindb/cryptoconditions/issues/27
try:
signature_valid = verifying_key\
.verify(block_serialized.encode(), signature)
except ValueError:
signature_valid = False
if signature_valid is False:
raise InvalidSignature('Invalid block signature')
transactions = [
Transaction.from_dict(tx) for tx in block['transactions']
]
return cls(transactions, block['node_pubkey'], block['timestamp'],
block['voters'], signature)
def validate_structure(tx_body):
"""Validate the transaction ID of a transaction
Args:
tx_body (dict): The Transaction to be transformed.
"""
# NOTE: Remove reference to avoid side effects
tx_body = deepcopy(tx_body)
try:
proposed_tx_id = tx_body.pop('id')
except KeyError:
raise InvalidHash()
tx_body_no_signatures = Transaction._remove_signatures(tx_body)
tx_body_serialized = Transaction._to_str(tx_body_no_signatures)
valid_tx_id = Transaction._to_hash(tx_body_serialized)
if proposed_tx_id != valid_tx_id:
raise InvalidHash()
def validate_id(tx_body):
"""Validate the transaction ID of a transaction
Args:
tx_body (dict): The Transaction to be transformed.
"""
# NOTE: Remove reference to avoid side effects
tx_body = deepcopy(tx_body)
try:
proposed_tx_id = tx_body.pop('id')
except KeyError:
raise InvalidHash('No transaction id found!')
tx_body_no_signatures = Transaction._remove_signatures(tx_body)
tx_body_serialized = Transaction._to_str(tx_body_no_signatures)
valid_tx_id = Transaction._to_hash(tx_body_serialized)
if proposed_tx_id != valid_tx_id:
err_msg = ("The transaction's id '{}' isn't equal to "
"the hash of its body, i.e. it's not valid.")
raise InvalidHash(err_msg.format(proposed_tx_id))
def from_dict(cls, tx_body):
"""Transforms a Python dictionary to a Transaction object.
Args:
tx_body (dict): The Transaction to be transformed.
Returns:
:class:`~bigchaindb.common.transaction.Transaction`
"""
# NOTE: Remove reference to avoid side effects
tx_body = deepcopy(tx_body)
try:
proposed_tx_id = tx_body.pop('id')
except KeyError:
raise InvalidHash()
tx_body_no_signatures = Transaction._remove_signatures(tx_body)
tx_body_serialized = Transaction._to_str(tx_body_no_signatures)
valid_tx_id = Transaction._to_hash(tx_body_serialized)
if proposed_tx_id != valid_tx_id:
raise InvalidHash()
else:
tx = tx_body['transaction']
fulfillments = [
Fulfillment.from_dict(fulfillment)
for fulfillment in tx['fulfillments']
]
conditions = [
Condition.from_dict(condition)
for condition in tx['conditions']
]
metadata = Metadata.from_dict(tx['metadata'])
asset = Asset.from_dict(tx['asset'])
return cls(tx['operation'], asset, fulfillments, conditions,
metadata, tx['timestamp'], tx_body['version'])
def from_dict(cls, block_body):
"""Transform a Python dictionary to a Block object.
Args:
block_body (dict): A block dictionary to be transformed.
Returns:
:class:`~Block`
Raises:
InvalidHash: If the block's id is not corresponding to its
data.
InvalidSignature: If the block's signature is not corresponding
to it's data or `node_pubkey`.
"""
# TODO: Reuse `is_signature_valid` method here.
block = block_body['block']
block_serialized = serialize(block)
block_id = hash_data(block_serialized)
public_key = PublicKey(block['node_pubkey'])
try:
signature = block_body['signature']
except KeyError:
signature = None
if block_id != block_body['id']:
raise InvalidHash()
if signature is not None:
# NOTE: CC throws a `ValueError` on some wrong signatures
# https://github.com/bigchaindb/cryptoconditions/issues/27
try:
signature_valid = public_key\
.verify(block_serialized.encode(), signature)
except ValueError:
signature_valid = False
if signature_valid is False:
raise InvalidSignature('Invalid block signature')
transactions = [
Transaction.from_dict(tx) for tx in block['transactions']
]
return cls(transactions, block['node_pubkey'], block['timestamp'],
block['voters'], signature)
