def create_stellar_deposit(transaction_id):
transaction = Transaction.objects.get(id=transaction_id)
# Assume transaction has valid stellar_account, amount_in, asset.name
stellar_account = transaction.stellar_account
payment_amount = transaction.amount_in - transaction.amount_fee
asset = transaction.asset.name
# If the given Stellar account does not exist, create
# the account with at least enough XLM for the minimum
# reserve and a trust line (recommended 2.01 XLM), update
# the transaction in our internal database, and return.
address = Address(stellar_account)
try:
address.get()
except HorizonError as e:
# 404 code corresponds to Resource Missing.
if e.status_code == 404:
starting_balance = settings.ACCOUNT_STARTING_BALANCE
builder = Builder(secret=settings.STELLAR_ACCOUNT_SEED)
builder.append_create_account_op(
destination=stellar_account,
starting_balance=starting_balance,
source=settings.STELLAR_ACCOUNT_ADDRESS,
)
builder.sign()
try:
builder.submit()
except HorizonError as exception:
raise exception
transaction.status = Transaction.STATUS.pending_trust
transaction.save()
return
# If the account does exist, deposit the desired amount of the given
# asset via a Stellar payment. If that payment succeeds, we update the
# transaction to completed at the current time. If it fails due to a
# trustline error, we update the database accordingly. Else, we do not update.
builder = Builder(secret=settings.STELLAR_ACCOUNT_SEED)
builder.append_payment_op(
destination=stellar_account,
asset_code=asset,
asset_issuer=settings.STELLAR_ACCOUNT_ADDRESS,
amount=str(payment_amount),
)
builder.sign()
try:
builder.submit()
except HorizonError as exception:
if TRUSTLINE_FAILURE_XDR in exception.message:
transaction.status = Transaction.STATUS.pending_trust
transaction.save()
return
# If we reach here, the Stellar payment succeeded, so we
# can mark the transaction as completed.
transaction.status = Transaction.STATUS.completed
transaction.completed_at = now()
transaction.amount_out = payment_amount
transaction.save()
def build_generate_trust_wallet_transaction(
transaction_source_address: str,
source_address: str,
destination_address: str,
xlm_amount: Decimal,
hot_amount: Decimal = Decimal(0),
sequence=None,
) -> Tuple[bytes, bytes]:
""""Build transaction return unsigned XDR and transaction hash.
Args:
transaction_source_address: Owner of a transaction.
source_address: Owner of creator address and payment operations.
destination_address: wallet id of new wallet.
xlm_amount: starting xlm_balance of new wallet.
hot_amount: starting hot balance of new wallet.
"""
builder = Builder(
address=transaction_source_address,
horizon=settings['HORIZON_URL'],
network=settings['PASSPHRASE'],
sequence=sequence,
)
builder.append_create_account_op(source=source_address,
destination=destination_address,
starting_balance=xlm_amount)
try:
builder.append_trust_op(
source=destination_address,
destination=settings['ISSUER'],
code=settings['ASSET_CODE'],
limit=settings['LIMIT_ASSET'],
)
except DecodeError:
raise web.HTTPBadRequest(reason='Parameter values are not valid.')
except Exception as e:
msg = str(e)
raise web.HTTPInternalServerError(reason=msg)
if hot_amount > 0:
builder.append_payment_op(
source=source_address,
destination=destination_address,
asset_code=settings['ASSET_CODE'],
asset_issuer=settings['ISSUER'],
amount=hot_amount,
)
try:
unsigned_xdr = builder.gen_xdr()
except Exception as e:
raise web.HTTPBadRequest(
reason='Bad request, Please ensure parameters are valid.')
tx_hash = builder.te.hash_meta()
return unsigned_xdr, tx_hash
def build_generate_wallet_transaction(transaction_source_address: str,
source_address: str,
destination_address: str,
amount: Decimal,
sequence=None) -> Tuple[bytes, bytes]:
""""Build transaction return unsigned XDR and transaction hash.
Args:
transaction_source_address: Owner of the transactoin
source_address: Owner of creator wallet
destination_address: wallet id of new wallet
amount: starting balance of new wallet
"""
builder = Builder(
address=transaction_source_address,
horizon=settings['HORIZON_URL'],
network=settings['PASSPHRASE'],
sequence=sequence,
)
try:
builder.append_create_account_op(source=source_address,
destination=destination_address,
starting_balance=amount)
except DecodeError:
raise web.HTTPBadRequest(reason='Parameter values are not valid.')
except Exception as e:
msg = str(e)
raise web.HTTPInternalServerError(reason=msg)
try:
unsigned_xdr = builder.gen_xdr()
except Exception as e:
raise web.HTTPBadRequest(
reason='Bad request, Please ensure parameters are valid.')
tx_hash = builder.te.hash_meta()
return unsigned_xdr, tx_hash
def test_builder(self):
cold_account = self.cold.address().decode()
hot_account = self.hot.address().decode()
fund(cold_account)
cold = Builder(self.cold.seed().decode())
cold.append_create_account_op(hot_account, 200)
cold.append_set_options_op(
inflation_dest=cold_account,
set_flags=1,
home_domain='256kw.com',
master_weight=10,
low_threshold=5,
)
cold.append_trust_op(cold_account, 'BEER', 1000, source=hot_account)
cold.append_allow_trust_op(hot_account, 'BEER', True)
# append twice for test
cold.append_payment_op(hot_account, 50.123, 'BEER', cold_account)
cold.append_payment_op(hot_account, 50.123, 'BEER', cold_account)
cold.sign(self.hot.seed().decode())
try: # sign twice
cold.sign(self.hot.seed().decode())
except SignatureExistError:
assert True
except:
assert False
cold.sign()
assert len(cold.te.signatures) == 2
assert len(cold.ops) == 5
try:
response = cold.submit()
print(response)
except:
assert False
def test_builder(self):
cold_account = self.cold.address().decode()
hot_account = self.hot.address().decode()
fund(cold_account)
cold = Builder(self.cold.seed().decode())
cold.append_create_account_op(hot_account, 200)
cold.append_set_options_op(inflation_dest=cold_account, set_flags=1,
home_domain='256kw.com',master_weight=10,
low_threshold=5,)
cold.append_trust_op(cold_account, 'BEER', 1000, source=hot_account)
cold.append_allow_trust_op(hot_account,'BEER', True)
# append twice for test
cold.append_payment_op(hot_account, 50.123, 'BEER', cold_account)
cold.append_payment_op(hot_account, 50.123, 'BEER', cold_account)
cold.sign(self.hot.seed().decode())
try: # sign twice
cold.sign(self.hot.seed().decode())
except SignatureExistError:
assert True
except:
assert False
cold.sign()
assert len(cold.te.signatures) == 2
assert len(cold.ops) == 5
try:
response = cold.submit()
print(response)
except:
assert False
def create_stellar_deposit(transaction_id):
"""Create and submit the Stellar transaction for the deposit."""
transaction = Transaction.objects.get(id=transaction_id)
# We check the Transaction status to avoid double submission of a Stellar
# transaction. The Transaction can be either `pending_anchor` if the task
# is called from `GET deposit/confirm_transaction` or `pending_trust` if called
# from the `check_trustlines()`.
if transaction.status not in [
Transaction.STATUS.pending_anchor,
Transaction.STATUS.pending_trust,
]:
return
transaction.status = Transaction.STATUS.pending_stellar
transaction.save()
# We can assume transaction has valid stellar_account, amount_in, and asset
# because this task is only called after those parameters are validated.
stellar_account = transaction.stellar_account
payment_amount = round(transaction.amount_in - transaction.amount_fee, 7)
asset = transaction.asset.name
# If the given Stellar account does not exist, create
# the account with at least enough XLM for the minimum
# reserve and a trust line (recommended 2.01 XLM), update
# the transaction in our internal database, and return.
address = Address(
stellar_account,
network=settings.STELLAR_NETWORK,
horizon_uri=settings.HORIZON_URI,
)
try:
address.get()
except HorizonError as address_exc:
# 404 code corresponds to Resource Missing.
if address_exc.status_code != 404:
return
starting_balance = settings.ACCOUNT_STARTING_BALANCE
builder = Builder(
secret=settings.STELLAR_ACCOUNT_SEED,
horizon_uri=settings.HORIZON_URI,
network=settings.STELLAR_NETWORK,
)
builder.append_create_account_op(
destination=stellar_account,
starting_balance=starting_balance,
source=settings.STELLAR_ACCOUNT_ADDRESS,
)
builder.sign()
try:
builder.submit()
except HorizonError:
return
transaction.status = Transaction.STATUS.pending_trust
transaction.save()
return
# If the account does exist, deposit the desired amount of the given
# asset via a Stellar payment. If that payment succeeds, we update the
# transaction to completed at the current time. If it fails due to a
# trustline error, we update the database accordingly. Else, we do not update.
builder = Builder(
secret=settings.STELLAR_ACCOUNT_SEED,
horizon_uri=settings.HORIZON_URI,
network=settings.STELLAR_NETWORK,
)
builder.append_payment_op(
destination=stellar_account,
asset_code=asset,
asset_issuer=settings.STELLAR_ACCOUNT_ADDRESS,
amount=str(payment_amount),
)
builder.sign()
try:
response = builder.submit()
# Functional errors at this stage are Horizon errors.
except HorizonError as exception:
if TRUSTLINE_FAILURE_XDR not in exception.message:
return
transaction.status = Transaction.STATUS.pending_trust
transaction.save()
return
# If this condition is met, the Stellar payment succeeded, so we
# can mark the transaction as completed.
if response["result_xdr"] != SUCCESS_XDR:
return
transaction.stellar_transaction_id = response["hash"]
transaction.status = Transaction.STATUS.completed
transaction.completed_at = now()
transaction.status_eta = 0 # No more status change.
transaction.amount_out = payment_amount
transaction.save()
async def build_generate_escrow_wallet_transaction(
escrow_address: str,
transaction_source_address: str,
creator_address: str,
destination_address: str,
provider_address: str,
cost_per_transaction: Decimal,
starting_native_asset: Decimal,
starting_custom_asset: Decimal,
expiration_date: str = None,
sequence: str = None,
) -> Tuple[Any, str]:
'''Building transaction for generating escrow wallet with minimum balance of lumens
and return unsigned XDR and transaction hash.
Args:
* escrow_address: an address of new wallet
* destination_address: an address of wallet which is target
* transaction_source_address an address from wallet pool
* provider_address: an address which provides custom_asset to new wallet
* creator_address: an address of source wallet which is owner of the transaction.
* cost_per_transaction: cost for each promotion deals.
* starting_native_asset: starting amount of XLM.
* starting_custom_asset: starting amount of custom asset(HOT).
* expiration_date: a date when escrow address is terminated.
'''
builder = Builder(
address=transaction_source_address,
horizon=settings['HORIZON_URL'],
network=settings['PASSPHRASE'],
sequence=sequence,
)
builder.append_create_account_op(source=creator_address,
destination=escrow_address,
starting_balance=starting_native_asset)
try:
builder.append_trust_op(
source=escrow_address,
destination=settings['ISSUER'],
code=settings['ASSET_CODE'],
limit=settings['LIMIT_ASSET'],
)
except DecodeError:
raise web.HTTPBadRequest(
reason='Parameter escrow_address or issuer address are not valid.')
except Exception as e:
msg = str(e)
raise web.HTTPInternalServerError(reason=msg)
builder.append_manage_data_op(source=escrow_address,
data_name='creator_address',
data_value=creator_address)
builder.append_manage_data_op(source=escrow_address,
data_name='destination_address',
data_value=destination_address)
builder.append_manage_data_op(source=escrow_address,
data_name='provider_address',
data_value=provider_address)
if expiration_date:
builder.append_manage_data_op(source=escrow_address,
data_name='expiration_date',
data_value=expiration_date)
builder.append_manage_data_op(source=escrow_address,
data_name='cost_per_transaction',
data_value=str(cost_per_transaction))
builder.append_set_options_op(source=escrow_address,
signer_address=creator_address,
signer_type='ed25519PublicKey',
signer_weight=1)
builder.append_set_options_op(source=escrow_address,
signer_address=provider_address,
signer_type='ed25519PublicKey',
signer_weight=1)
builder.append_set_options_op(source=escrow_address,
master_weight=0,
low_threshold=2,
med_threshold=2,
high_threshold=2)
builder.append_payment_op(
source=provider_address,
destination=escrow_address,
asset_code=settings['ASSET_CODE'],
asset_issuer=settings['ISSUER'],
amount=starting_custom_asset,
)
try:
xdr = builder.gen_xdr()
except Exception as e:
raise web.HTTPBadRequest(
reason='Bad request, Please ensure parameters are valid.')
tx_hash = builder.te.hash_meta()
return xdr.decode(), binascii.hexlify(tx_hash).decode()
horizon = horizon_testnet()
print('Initializing keypairs')
kp_alice = initialize_keypair()
kp_bob = initialize_keypair()
kp_carol = initialize_keypair()
print('Carol creates accounts a_1 and a_2')
kp_a_1 = initialize_keypair(add_funds=False)
kp_a_2 = initialize_keypair(add_funds=False)
kp_a_1_address = kp_a_1.address().decode()
kp_a_2_address = kp_a_2.address().decode()
kp_a_1_seed = kp_a_1.seed().decode()
kp_a_2_seed = kp_a_2.seed().decode()
accounts_builder = Builder(secret=kp_carol.seed().decode())
accounts_builder.append_create_account_op(
kp_a_1_address, '202.50009')
accounts_builder.append_create_account_op(
kp_a_2_address, '202.50009')
accounts_builder.sign()
response = accounts_builder.submit()
assert 'hash' in response
print('Initializing transactions')
address_a_1 = Address(address=kp_a_1_address)
address_a_2 = Address(address=kp_a_2_address)
address_a_1.get()
address_a_2.get()
starting_sequence_a_1 = int(address_a_1.sequence)
starting_sequence_a_2 = int(address_a_2.sequence)
class Interface:
"""
Interface to handle all API calls to third-party account.
"""
def __init__(self, account):
self.account = account
if account.secret:
self.builder = Builder(secret=account.secret,
network=account.network)
self.address = Address(address=account.account_id,
network=account.network)
def _get_new_receives(self):
# Get all stored transactions for account
transactions = ReceiveTransaction.filter(admin_account=self.account)
# Set the cursor according to latest stored transaction:
if not transactions:
cursor = None
else:
cursor = int(transactions.latest().data['paging_token']) + 1
# Get new transactions from the stellar network:
new_transactions = self._get_receives(cursor=cursor)
return new_transactions
def _get_receives(self, cursor=None):
# If cursor was specified, get all transactions after the cursor:
if cursor:
transactions = self.address.payments(cursor=cursor)['_embedded']['records']
print(transactions)
for i, tx in enumerate(transactions):
if tx.get('to') != self.account.account_id:
transactions.pop(i) # remove sends
# else just get all the transactions:
else:
transactions = self.address.payments()['_embedded']['records']
for i, tx in enumerate(transactions):
if tx.get('from') == self.account.account_id:
transactions.pop(i) # remove sends
return transactions
def _process_receive(self, tx):
# Get memo:
details = requests.get(url=tx['_links']['transaction']['href']).json()
memo = details.get('memo')
print('memo: ' + str(memo))
if memo:
account_id = memo + '*rehive.com'
user_account = UserAccount.objects.get(account_id=account_id)
user_email = user_account.user_id # for this implementation, user_id is the user's email
amount = to_cents(Decimal(tx['amount']), 7)
if tx['asset_type'] == 'native':
currency = 'XLM'
issuer = ''
else:
currency = tx['asset_code']
issuer_address = tx['asset_issuer']
issuer = Asset.objects.get(account_id=issuer_address, code=currency).issuer
# Create Transaction:
tx = ReceiveTransaction.objects.create(user_account=user_account,
external_id=tx['hash'],
recipient=user_email,
amount=amount,
currency=currency,
issuer=issuer,
status='Waiting',
data=tx,
metadata={'type': 'stellar'}
)
# TODO: Move tx.upload_to_rehive() to a signal to auto-run after Transaction creation.
tx.upload_to_rehive()
return True
@staticmethod
def _is_valid_address(address: str) -> bool:
# TODO: Replace with real address check.
if len(address) == 56 and '*' not in address:
return True
else:
return False
# This function should always be included if transactions are received to admin account and not added via webhooks:
def process_receives(self):
# Get new receive transactions
new_transactions = self._get_new_receives()
# Add each transaction to Rehive and log in transaction table:
for tx in new_transactions:
self._process_receive(tx)
# This function should always be included.
def process_send(self, tx):
if self._is_valid_address(tx.recipient):
address = tx.recipient
else:
federation = get_federation_details(tx.recipient)
if federation['memo_type'] == 'text':
self.builder.add_text_memo(federation['memo'])
elif federation['memo_type'] == 'id':
self.builder.add_id_memo(federation['memo'])
elif federation['memo_type'] == 'hash':
self.builder.add_hash_memo(federation['memo'])
else:
raise NotImplementedAPIError('Invalid memo type specified.')
address = federation['account_id']
# Create account or create payment:
if tx.currency == 'XLM':
try:
address_obj = self.address
address_obj.get()
self.builder.append_payment_op(address, tx.amount, 'XLM')
except APIException as exc:
if exc.status_code == 404:
self.builder.append_create_account_op(address, tx.amount)
else:
# Get issuer address details:
issuer_address = get_issuer_address(tx.issuer, tx.currency)
address_obj = self.address
address_obj.get()
self.builder.append_payment_op(address, tx.amount, tx.currency, issuer_address)
try:
self.builder.sign()
self.builder.submit()
except Exception as exc:
print(exc.payload)
def get_balance(self):
address = self.address
address.get()
for balance in address.balances:
if balance['asset_type'] == 'native':
return to_cents(Decimal(balance['balance']), 7)
def get_issuer_address(self, issuer, asset_code):
if self._is_valid_address(issuer):
address = issuer
else:
if '*' in issuer:
address = get_federation_details(issuer)['account_id']
else: # assume it is an anchor domain
address = address_from_domain(issuer, asset_code)
return address
def trust_issuer(self, asset_code, issuer):
logger.info('Trusting issuer: %s %s' % (issuer, asset_code))
address = self.get_issuer_address(issuer, asset_code)
self.builder.append_trust_op(address, asset_code)
try:
self.builder.sign()
self.builder.submit()
except Exception as exc:
print(exc.payload)
# Generate new crypto address/ account id
@staticmethod
def new_account_id(**kwargs):
metadata = kwargs.get('metadata')
account_id = metadata['username'] + '*' + getattr(settings, 'STELLAR_WALLET_DOMAIN')
return account_id
def get_account_details(self):
address = self.account.account_id
qr_code = create_qr_code_url('stellar:' + str(address))
return {'account_id': address, 'metadata': {'qr_code': qr_code}}
async def build_joint_wallet(
transaction_source_address: str,
deal_address: str,
parties: List,
creator: str,
starting_xlm: Decimal,
meta: str = None,
sequence: str = None,
):
"""Build transaction for create joint wallet, trust HOT and set option signer."""
def _add_signer(builder: Builder, deal_address: str, party: str,
amount: Decimal):
"""Set permission of parties can signed transaction that generate from joint account"""
builder.append_set_options_op(source=deal_address,
signer_address=party,
signer_type='ed25519PublicKey',
signer_weight=1)
builder.append_payment_op(
source=party,
destination=deal_address,
asset_code=settings['ASSET_CODE'],
asset_issuer=settings['ISSUER'],
amount=amount,
)
builder = Builder(
address=transaction_source_address,
horizon=settings['HORIZON_URL'],
network=settings['PASSPHRASE'],
sequence=sequence,
)
builder.append_create_account_op(source=creator,
destination=deal_address,
starting_balance=starting_xlm)
builder.append_trust_op(source=deal_address,
destination=settings['ISSUER'],
code=settings['ASSET_CODE'],
limit=settings['LIMIT_ASSET'])
builder.append_set_options_op(source=deal_address,
signer_address=creator,
signer_type='ed25519PublicKey',
signer_weight=1)
for party in parties:
_add_signer(builder, deal_address, party['address'], party['amount'])
if meta and isinstance(meta, dict):
for key, value in meta.items():
builder.append_manage_data_op(source=deal_address,
data_name=key,
data_value=value)
builder.append_manage_data_op(source=deal_address,
data_name='creator_address',
data_value=creator)
weight = len(parties) + 1
builder.append_set_options_op(source=deal_address,
master_weight=0,
low_threshold=weight,
med_threshold=weight,
high_threshold=weight)
xdr = builder.gen_xdr()
tx_hash = builder.te.hash_meta()
return xdr.decode(), binascii.hexlify(tx_hash).decode()