def validate(self):
"""
Ensure the condition is valid according the local rules.
Checks the condition against the local bitmask (supported condition types)
and the local maximum fulfillment size.
Returns:
bool: Whether the condition is valid according to local rules.
"""
# Get class for type ID, throws on error
TypeRegistry.get_class_from_type_id(self.type_id)
# Bitmask can have at most 32 bits with current implementation
if self.bitmask > Condition.MAX_SAFE_BITMASK:
raise ValueError('Bitmask too large to be safely represented')
# Assert all requested features are supported by this implementation
if self.bitmask & ~Condition.SUPPORTED_BITMASK:
raise ValueError('Condition requested unsupported feature suites')
# Assert the requested fulfillment size is supported by this implementation
if self.max_fulfillment_length > Condition.MAX_FULFILLMENT_LENGTH:
raise ValueError(
'Condition requested too large of a max fulfillment size')
return True
def validate(self):
"""
Ensure the condition is valid according the local rules.
Checks the condition against the local bitmask (supported condition types)
and the local maximum fulfillment size.
Returns:
bool: Whether the condition is valid according to local rules.
"""
# Get class for type ID, throws on error
TypeRegistry.get_class_from_type_id(self.type_id)
# Bitmask can have at most 32 bits with current implementation
if self.bitmask > Condition.MAX_SAFE_BITMASK:
raise ValueError('Bitmask too large to be safely represented')
# Assert all requested features are supported by this implementation
if self.bitmask & ~Condition.SUPPORTED_BITMASK:
raise ValueError('Condition requested unsupported feature suites')
# Assert the requested fulfillment size is supported by this implementation
if self.max_fulfillment_length > Condition.MAX_FULFILLMENT_LENGTH:
raise ValueError('Condition requested too large of a max fulfillment size')
return True
def from_uri(serialized_fulfillment):
"""
Create a Fulfillment object from a URI.
This method will parse a fulfillment URI and construct a corresponding Fulfillment object.
Args:
serialized_fulfillment (str): URI representing the fulfillment
Return:
Fulfillment: Resulting object
"""
if isinstance(serialized_fulfillment, Fulfillment):
return serialized_fulfillment
elif not isinstance(serialized_fulfillment, str):
raise TypeError('Serialized fulfillment must be a string')
pieces = serialized_fulfillment.split(':')
if not pieces[0] == 'cf':
raise ValueError('Serialized fulfillment must start with "cf:"')
if not re.match(Fulfillment.REGEX, serialized_fulfillment):
raise ValueError('Invalid fulfillment format')
# try:
type_id = int(pieces[1], 16)
payload = base64.urlsafe_b64decode(base64_add_padding(pieces[2]))
cls = TypeRegistry.get_class_from_type_id(type_id)
fulfillment = cls()
fulfillment.parse_payload(Reader.from_source(payload), len(payload))
# except Exception as e:
# raise ParsingError(str(e))
return fulfillment
def from_dict(data):
cls_type = data['type_id']
cls = TypeRegistry.get_class_from_type_id(cls_type)
fulfillment = cls()
fulfillment.parse_dict(data)
return fulfillment
def from_binary(reader):
"""
Create a Fulfillment object from a binary blob.
This method will parse a stream of binary data and construct a
corresponding Fulfillment object.
Args:
reader (Reader): Binary stream implementing the Reader interface
Returns:
Fulfillment: Resulting object
"""
reader = Reader.from_source(reader)
cls_type = reader.read_uint16()
cls = TypeRegistry.get_class_from_type_id(cls_type)
fulfillment = cls()
payload_length = reader.read_length_prefix()
fulfillment.parse_payload(reader, payload_length)
return fulfillment
