def sign_channel_config(self, config, to_string=True):
"""This method uses the client instance's current signing identity to
sign over the configuration bytes passed in.
Args:
config: The configuration update in bytes form.
to_string: Whether to convert the result to string
Returns:
config_signature (common_pb2.ConfigSignature):
The signature of the current user of the config bytes.
"""
sign_channel_context = self.tx_context
proto_signature_header = common_pb2.SignatureHeader()
proto_signature_header.creator = sign_channel_context.identity
proto_signature_header.nonce = sign_channel_context.nonce
proto_signature_header_bytes = \
proto_signature_header.SerializeToString()
signing_bytes = proto_signature_header_bytes + config
signature_bytes = sign_channel_context.sign(signing_bytes)
proto_config_signature = configtx_pb2.ConfigSignature()
proto_config_signature.signature_header = proto_signature_header_bytes
proto_config_signature.signature = signature_bytes
if to_string:
return proto_config_signature.SerializeToString()
else:
return proto_config_signature
def _get_latest_block(self, tx_context, orderer):
""" Get latest block from orderer.
Args:
tx_context (object): a tx_context instance
orderer (object): a orderer instance
"""
seek_info = ab_pb2.SeekInfo()
seek_info.start.newest = ab_pb2.SeekNewest()
seek_info.stop.newest = ab_pb2.SeekNewest()
seek_info.behavior = \
ab_pb2.SeekInfo.SeekBehavior.Value('BLOCK_UNTIL_READY')
seek_info_header = self._build_channel_header(
common_pb2.HeaderType.Value('DELIVER_SEEK_INFO'), tx_context.tx_id,
self._name, current_timestamp(), tx_context.epoch)
signature_header = common_pb2.SignatureHeader()
signature_header.creator = tx_context.identity
signature_header.nonce = tx_context.nonce
seek_payload = common_pb2.Payload()
seek_payload.header.signature_header = \
signature_header.SerializeToString()
seek_payload.header.channel_header = \
seek_info_header.SerializeToString()
seek_payload.data = seek_info.SerializeToString()
envelope = common_pb2.Envelope()
envelope.signature = tx_context.sign(seek_payload.SerializeToString())
envelope.payload = seek_payload.SerializeToString()
def decode_signature_header(signature_header_bytes):
"""Decode signature header
:param signature_header_bytes: signature header bytes
:return: deserialized signature_header
"""
signature_header = {}
proto_signature_header = common_pb2.SignatureHeader()
proto_signature_header.ParseFromString(signature_header_bytes)
signature_header['creator'] = \
decode_identity(proto_signature_header.creator)
signature_header['nonce'] = \
binascii.b2a_hex(proto_signature_header.nonce)
return signature_header
def build_header(creator,
nonce,
tran_prop_type,
chain,
prop_type,
epoch=0,
chaincode_id=None):
"""Build a header for transaction proposal.
Args:
prop_type: prop type
creator: user
nonce: nonce
tran_prop_type: transaction proposal type
chain: chain instance
epoch: epoch
chaincode_id: chaincode id
Returns: common_proto.Header instance
"""
header = common_pb2.Header()
signature_header = common_pb2.SignatureHeader()
signature_header.creator = creator.serialize()
signature_header.nonce = nonce
header.signature_header = signature_header.SerializeToString()
channel_header = common_pb2.ChannelHeader()
channel_header.type = tran_prop_type
channel_header.version = 1
if prop_type != CC_INSTALL:
channel_header.channel_id = proto_str(chain.name)
channel_header.tx_id = proto_str(chain.generate_tx_id(nonce, creator))
channel_header.epoch = epoch
if chaincode_id:
header_ext = proposal_pb2.ChaincodeHeaderExtension()
header_ext.chaincode_id.name = proto_str(chaincode_id)
channel_header.extension = header_ext.SerializeToString()
header.channel_header = channel_header.SerializeToString()
return header
def build_header(creator, channel_header, nonce):
"""This function will build the common header.
:param creator: Serialized identity of the creator.
:type creator: protobuf SerializedIdentity
:param channel_header: ChannelHeader
:type channel_header: protobuf ChannelHeader
:param nonce: Nonce that has been used for the tx_id.
:type nonce: str
:return: Returns created protobuf common header.
:rtype: header
"""
signature_header = common_pb2.SignatureHeader()
signature_header.creator = creator
signature_header.nonce = nonce
header = common_pb2.Header()
header.signature_header = signature_header.SerializeToString()
header.channel_header = channel_header.SerializeToString()
return header
def build_header(creator, channel_header, nonce):
"""This function will build the common header.
Args:
creator (protobuf SerializedIdentity):
Serialized identity of the creator.
channel_header (protobuf ChannelHeader): ChannelHeader
nonce (str): Nonce that has been used for the tx_id.
Returns:
header: Returns created protobuf common header.
"""
signature_header = common_pb2.SignatureHeader()
signature_header.creator = creator
signature_header.nonce = nonce
header = common_pb2.Header()
header.signature_header = signature_header.SerializeToString()
header.channel_header = channel_header.SerializeToString()
return header
