class TransactionFactory(object):
def __init__(self,
config,
mongo,
block_height,
bulletin_secret='',
username='',
value=0,
fee=0.0,
requester_rid='',
requested_rid='',
public_key='',
dh_public_key='',
private_key='',
dh_private_key='',
to='',
inputs='',
outputs='',
coinbase=False,
chattext=None,
signin=None):
self.config = config
self.mongo = mongo
self.block_height = block_height
self.bulletin_secret = bulletin_secret
self.username = username
self.requester_rid = requester_rid
self.requested_rid = requested_rid
self.public_key = public_key
self.dh_public_key = dh_public_key
self.private_key = private_key
self.value = value
self.fee = float(fee)
self.dh_private_key = dh_private_key
self.to = to
self.time = str(int(time.time()))
self.outputs = []
for x in outputs:
self.outputs.append(Output.from_dict(x))
self.inputs = []
for x in inputs:
if 'signature' in x:
self.inputs.append(
ExternalInput.from_dict(self.config, self.mongo, x))
else:
self.inputs.append(Input.from_dict(x))
self.coinbase = coinbase
self.chattext = chattext
self.signin = signin
self.do_money()
inputs_concat = self.get_input_hashes()
outputs_concat = self.get_output_hashes()
if bulletin_secret:
self.rid = self.generate_rid()
if self.chattext:
self.relationship = json.dumps({"chatText": self.chattext})
self.cipher = Crypt(self.config.wif)
self.encrypted_relationship = self.cipher.encrypt(
self.relationship)
elif self.signin:
for shared_secret in TU.get_shared_secrets_by_rid(
self.config, self.mongo, self.rid):
self.relationship = SignIn(self.signin)
self.cipher = Crypt(shared_secret.encode('hex'),
shared=True)
self.encrypted_relationship = self.cipher.shared_encrypt(
self.relationship.to_json())
else:
if not self.dh_public_key or not self.dh_private_key:
a = os.urandom(32)
self.dh_public_key = scalarmult_base(a).encode('hex')
self.dh_private_key = a.encode('hex')
self.relationship = self.generate_relationship()
if not private_key:
raise BaseException('missing private key')
self.cipher = Crypt(self.config.wif)
self.encrypted_relationship = self.cipher.encrypt(
self.relationship.to_json())
else:
self.rid = ''
self.encrypted_relationship = ''
self.header = (self.public_key + self.time + self.dh_public_key +
self.rid + self.encrypted_relationship +
"{0:.8f}".format(self.fee) + self.requester_rid +
self.requested_rid + inputs_concat + outputs_concat)
self.hash = hashlib.sha256(self.header).digest().encode('hex')
if self.private_key:
self.transaction_signature = TU.generate_signature_with_private_key(
private_key, self.hash)
else:
self.transaction_signature = ''
self.transaction = self.generate_transaction()
def do_money(self):
my_address = str(
P2PKHBitcoinAddress.from_pubkey(self.public_key.decode('hex')))
input_txns = BU.get_wallet_unspent_transactions(
self.config, self.mongo, my_address)
miner_transactions = self.mongo.db.miner_transactions.find()
mtxn_ids = []
for mtxn in miner_transactions:
for mtxninput in mtxn['inputs']:
mtxn_ids.append(mtxninput['id'])
if self.inputs:
inputs = self.inputs
else:
inputs = []
for input_txn in input_txns:
if input_txn['id'] not in mtxn_ids:
if 'signature' in input_txn:
inputs.append(
ExternalInput.from_dict(self.config, self.mongo,
input_txn))
else:
inputs.append(Input.from_dict(input_txn))
input_sum = 0
if self.coinbase:
self.inputs = []
else:
if inputs:
needed_inputs = []
done = False
for y in inputs:
print y.id
txn = BU.get_transaction_by_id(self.config,
self.mongo,
y.id,
instance=True)
if isinstance(y, ExternalInput):
y.verify()
address = str(
P2PKHBitcoinAddress.from_pubkey(
txn.public_key.decode('hex')))
else:
address = my_address
for txn_output in txn.outputs:
if txn_output.to == address:
input_sum += txn_output.value
needed_inputs.append(y)
if input_sum >= (
sum([x.value
for x in self.outputs]) + self.fee):
done = True
break
if done == True:
break
if not done:
raise NotEnoughMoneyException('not enough money')
self.inputs = needed_inputs
else:
self.inputs = []
remainder = input_sum - (sum([x.value
for x in self.outputs]) + self.fee)
found = False
for x in self.outputs:
if my_address == x.to:
found = True
x.value += remainder
if not found:
return_change_output = Output(to=my_address, value=remainder)
self.outputs.append(return_change_output)
def get_input_hashes(self):
from fastgraph import FastGraph
input_hashes = []
for x in self.inputs:
txn = BU.get_transaction_by_id(self.config,
self.mongo,
x.id,
instance=True,
include_fastgraph=isinstance(
self, FastGraph))
input_hashes.append(str(txn.transaction_signature))
return ''.join(sorted(input_hashes, key=str.lower))
def get_output_hashes(self):
outputs_sorted = sorted([x.to_dict() for x in self.outputs],
key=lambda x: x['to'].lower())
return ''.join(
[x['to'] + "{0:.8f}".format(x['value']) for x in outputs_sorted])
def generate_rid(self):
my_bulletin_secret = self.config.get_bulletin_secret()
if my_bulletin_secret == self.bulletin_secret:
raise BaseException(
'bulletin secrets are identical. do you love yourself so much that you want a relationship on the blockchain?'
)
bulletin_secrets = sorted(
[str(my_bulletin_secret),
str(self.bulletin_secret)],
key=str.lower)
return hashlib.sha256(
str(bulletin_secrets[0]) +
str(bulletin_secrets[1])).digest().encode('hex')
def generate_relationship(self):
return Relationship(
dh_private_key=self.dh_private_key,
their_bulletin_secret=self.bulletin_secret,
their_username=self.username,
my_bulletin_secret=self.config.get_bulletin_secret(),
my_username=self.config.username)
def generate_transaction(self):
return Transaction(self.config,
self.mongo,
self.block_height,
self.time,
self.rid,
self.transaction_signature,
self.encrypted_relationship,
self.public_key,
self.dh_public_key,
float(self.fee),
self.requester_rid,
self.requested_rid,
self.hash,
inputs=[x.to_dict() for x in self.inputs],
outputs=[x.to_dict() for x in self.outputs],
coinbase=self.coinbase)
def generate_transaction_signature(self):
return TU.generate_signature(self.hash, self.private_key)
class TransactionFactory(object):
def __init__(self,
bulletin_secret='',
username='',
value=0,
fee=0.0,
requester_rid='',
requested_rid='',
public_key='',
dh_public_key='',
private_key='',
dh_private_key='',
to='',
inputs='',
outputs='',
coinbase=False,
chattext=None,
signin=None):
self.bulletin_secret = bulletin_secret
self.username = username
self.requester_rid = requester_rid
self.requested_rid = requested_rid
self.public_key = public_key
self.dh_public_key = dh_public_key
self.private_key = private_key
self.value = value
self.fee = float(fee)
self.dh_private_key = dh_private_key
self.to = to
self.outputs = outputs or []
self.inputs = inputs
self.coinbase = coinbase
self.chattext = chattext
self.signin = signin
self.do_money()
inputs_concat = self.get_input_hashes()
outputs_concat = self.get_output_hashes()
if bulletin_secret:
self.rid = self.generate_rid()
if self.chattext:
self.relationship = json.dumps({"chatText": self.chattext})
elif self.signin:
for shared_secret in TU.get_shared_secrets_by_rid(self.rid):
self.relationship = SignIn(self.signin)
self.cipher = Crypt(shared_secret.encode('hex'),
shared=True)
self.encrypted_relationship = self.cipher.shared_encrypt(
self.relationship.to_json())
else:
self.relationship = self.generate_relationship()
if not private_key:
raise BaseException('missing private key')
self.cipher = Crypt(Config.wif)
self.encrypted_relationship = self.cipher.encrypt(
self.relationship.to_json())
else:
self.rid = ''
self.encrypted_relationship = ''
self.hash = hashlib.sha256(self.dh_public_key + self.rid +
self.encrypted_relationship +
"{0:.8f}".format(self.fee) +
self.requester_rid + self.requested_rid +
inputs_concat +
outputs_concat).digest().encode('hex')
self.transaction_signature = self.generate_transaction_signature()
self.transaction = self.generate_transaction()
def do_money(self):
Mongo.init()
my_address = str(
P2PKHBitcoinAddress.from_pubkey(self.public_key.decode('hex')))
input_txns = BU.get_wallet_unspent_transactions(my_address)
miner_transactions = Mongo.db.miner_transactions.find()
mtxn_ids = []
for mtxn in miner_transactions:
for mtxninput in mtxn['inputs']:
mtxn_ids.append(mtxninput['id'])
inputs = [
Input.from_dict(input_txn) for input_txn in input_txns
if input_txn['id'] not in mtxn_ids
]
input_sum = 0
if self.coinbase:
self.inputs = []
else:
needed_inputs = []
done = False
for y in inputs:
print y.id
txn = BU.get_transaction_by_id(y.id, instance=True)
for txn_output in txn.outputs:
if txn_output.to == my_address:
input_sum += txn_output.value
needed_inputs.append(y)
if input_sum >= (sum([x.value for x in self.outputs]) +
self.fee):
done = True
break
if done == True:
break
if not done:
raise NotEnoughMoneyException('not enough money')
self.inputs = needed_inputs
return_change_output = Output(
to=my_address,
value=input_sum - (sum([x.value
for x in self.outputs]) + self.fee))
self.outputs.append(return_change_output)
def get_input_hashes(self):
input_hashes = []
for x in self.inputs:
txn = BU.get_transaction_by_id(x.id, instance=True)
input_hashes.append(str(txn.transaction_signature))
return ''.join(sorted(input_hashes, key=str.lower))
def get_output_hashes(self):
outputs_sorted = sorted([x.to_dict() for x in self.outputs],
key=lambda x: x['to'].lower())
return ''.join(
[x['to'] + "{0:.8f}".format(x['value']) for x in outputs_sorted])
def generate_rid(self):
my_bulletin_secret = Config.get_bulletin_secret()
if my_bulletin_secret == self.bulletin_secret:
raise BaseException(
'bulletin secrets are identical. do you love yourself so much that you want a relationship on the blockchain?'
)
bulletin_secrets = sorted(
[str(my_bulletin_secret),
str(self.bulletin_secret)],
key=str.lower)
return hashlib.sha256(
str(bulletin_secrets[0]) +
str(bulletin_secrets[1])).digest().encode('hex')
def generate_relationship(self):
return Relationship(dh_private_key=self.dh_private_key,
their_bulletin_secret=self.bulletin_secret,
their_username=self.username,
my_bulletin_secret=Config.get_bulletin_secret(),
my_username=Config.username)
def generate_transaction(self):
return Transaction(self.rid,
self.transaction_signature,
self.encrypted_relationship,
self.public_key,
self.dh_public_key,
float(self.fee),
self.requester_rid,
self.requested_rid,
self.hash,
inputs=self.inputs,
outputs=self.outputs,
coinbase=self.coinbase)
def generate_transaction_signature(self):
return TU.generate_signature(self.hash)
