class Signer:
def __init__(self, net_id):
self.net_id = net_id
self.lambda_client = boto3.client("lambda", region_name=REGION_NAME)
self.obj_utils = Utils()
self.obj_blockchain_utils = BlockChainUtil(
provider_type="HTTP_PROVIDER",
provider=NETWORKS[self.net_id]["http_provider"],
)
self.mpe_address = self.obj_blockchain_utils.read_contract_address(
net_id=self.net_id, path=MPE_ADDR_PATH, key="address")
self.current_block_no = self.obj_blockchain_utils.get_current_block_no(
)
def _get_free_calls_allowed(self, org_id, service_id, group_id):
lambda_payload = {
"httpMethod": "GET",
"pathParameters": {
"orgId": org_id,
"serviceId": service_id
},
}
response = self.lambda_client.invoke(
FunctionName=
GET_SERVICE_DETAILS_FOR_GIVEN_ORG_ID_AND_SERVICE_ID_ARN,
InvocationType="RequestResponse",
Payload=json.dumps(lambda_payload),
)
response_body_raw = json.loads(response.get("Payload").read())["body"]
get_service_response = json.loads(response_body_raw)
if get_service_response["status"] == "success":
groups_data = get_service_response["data"].get("groups", [])
for group_data in groups_data:
if group_data["group_id"] == group_id:
return group_data["free_calls"]
raise Exception(
"Unable to fetch free calls information for service %s under organization %s for %s group.",
service_id, org_id, group_id)
def _get_total_calls_made(self, username, org_id, service_id, group_id):
lambda_payload = {
"httpMethod": "GET",
"queryStringParameters": {
"organization_id": org_id,
"service_id": service_id,
"username": username,
"group_id": group_id,
},
}
response = self.lambda_client.invoke(
FunctionName=METERING_ARN,
InvocationType="RequestResponse",
Payload=json.dumps(lambda_payload),
)
if response["StatusCode"] == 200:
metering_data_raw = json.loads(
response.get("Payload").read())["body"]
total_calls_made = json.loads(metering_data_raw).get(
"total_calls_made", None)
if total_calls_made is not None:
return total_calls_made
raise Exception(
"Unable to fetch total calls made for service %s under organization %s for %s group.",
service_id, org_id, group_id)
def _get_no_of_free_call_available(self, username, org_id, service_id,
group_id):
token_to_get_free_call, expiry_date_block, signature, current_block_number, daemon_endpoint, free_calls_allowed = self.token_to_get_free_call(
username, org_id, service_id, group_id)
total_free_call_available = 0
try:
total_free_call_available = self._get_no_of_free_calls_from_daemon(
username, token_to_get_free_call, expiry_date_block, signature,
current_block_number, daemon_endpoint)
except Exception as e:
logger.info(
f"Free call from daemon not available switching to metering {org_id} {service_id} {group_id} {username}"
)
total_free_call_made = self._get_total_calls_made(
username, org_id, service_id, group_id)
total_free_call_available = free_calls_allowed - total_free_call_made
return total_free_call_available
def _free_calls_allowed(self, username, org_id, service_id, group_id):
"""
Method to check free calls exists for given user or not.
Call monitoring service to get the details
"""
free_calls_available = self._get_no_of_free_call_available(
username, org_id, service_id, group_id)
if free_calls_available > 0:
return True
return False
def signature_for_free_call(self, user_data, org_id, service_id, group_id):
"""
Method to generate signature for free call.
"""
try:
username = user_data["authorizer"]["claims"]["email"]
if self._free_calls_allowed(username=username,
org_id=org_id,
service_id=service_id,
group_id=group_id):
current_block_no = self.obj_utils.get_current_block_no(
ws_provider=NETWORKS[self.net_id]["ws_provider"])
provider = Web3.HTTPProvider(
NETWORKS[self.net_id]["http_provider"])
w3 = Web3(provider)
message = web3.Web3.soliditySha3(
["string", "string", "string", "string", "uint256"],
[
PREFIX_FREE_CALL, username, org_id, service_id,
current_block_no
],
)
signer_key = SIGNER_KEY
if not signer_key.startswith("0x"):
signer_key = "0x" + signer_key
signature = bytes(
w3.eth.account.signHash(defunct_hash_message(message),
signer_key).signature)
signature = signature.hex()
if not signature.startswith("0x"):
signature = "0x" + signature
return {
"snet-free-call-user-id": username,
"snet-payment-channel-signature-bin": signature,
"snet-current-block-number": current_block_no,
"snet-payment-type": "free-call",
"snet-free-call-auth-token-bin": "",
"snet-free-call-token-expiry-block": 0
}
else:
raise Exception("Free calls expired for username %s.",
username)
except Exception as e:
logger.error(repr(e))
raise e
def signature_for_regular_call(self, user_data, channel_id, nonce, amount):
"""
Method to generate signature for regular call.
"""
try:
username = user_data["authorizer"]["claims"]["email"]
data_types = ["string", "address", "uint256", "uint256", "uint256"]
values = [
"__MPE_claim_message",
self.mpe_address,
channel_id,
nonce,
amount,
]
signature = self.obj_blockchain_utils.generate_signature(
data_types=data_types, values=values, signer_key=SIGNER_KEY)
return {
"snet-payment-channel-signature-bin": signature,
"snet-payment-type": "escrow",
"snet-payment-channel-id": channel_id,
"snet-payment-channel-nonce": nonce,
"snet-payment-channel-amount": amount,
"snet-current-block-number": self.current_block_no,
}
except Exception as e:
logger.error(repr(e))
raise Exception(
"Unable to generate signature for daemon call for username %s",
username)
def signature_for_state_service(self, user_data, channel_id):
"""
Method to generate signature for state service.
"""
try:
username = user_data["authorizer"]["claims"]["email"]
data_types = ["string", "address", "uint256", "uint256"]
values = [
"__get_channel_state",
self.mpe_address,
channel_id,
self.current_block_no,
]
signature = self.obj_blockchain_utils.generate_signature(
data_types=data_types, values=values, signer_key=SIGNER_KEY)
return {
"signature": signature,
"snet-current-block-number": self.current_block_no,
}
except Exception as e:
logger.error(repr(e))
raise Exception(
"Unable to generate signature for daemon call for username %s",
username)
def signature_for_open_channel_for_third_party(self, recipient, group_id,
amount_in_cogs, expiration,
message_nonce,
sender_private_key,
executor_wallet_address):
data_types = [
"string", "address", "address", "address", "address", "bytes32",
"uint256", "uint256", "uint256"
]
values = [
"__openChannelByThirdParty", self.mpe_address,
executor_wallet_address, SIGNER_ADDRESS, recipient, group_id,
amount_in_cogs, expiration, message_nonce
]
signature = self.obj_blockchain_utils.generate_signature(
data_types=data_types,
values=values,
signer_key=sender_private_key)
v, r, s = Web3.toInt(
hexstr="0x" +
signature[-2:]), signature[:66], "0x" + signature[66:130]
return {"r": r, "s": s, "v": v, "signature": signature}
def _get_no_of_free_calls_from_daemon(self, email, token_to_get_free_call,
expiry_date_block, signature,
current_block_number,
daemon_endpoint):
request = state_service_pb2.FreeCallStateRequest()
request.user_id = email
request.token_for_free_call = token_to_get_free_call
request.token_expiry_date_block = expiry_date_block
request.signature = signature
request.current_block = current_block_number
endpoint_object = urlparse(daemon_endpoint)
if endpoint_object.port is not None:
channel_endpoint = endpoint_object.hostname + ":" + str(
endpoint_object.port)
else:
channel_endpoint = endpoint_object.hostname
if endpoint_object.scheme == "http":
channel = grpc.insecure_channel(channel_endpoint)
elif endpoint_object.scheme == "https":
channel = grpc.secure_channel(channel_endpoint,
grpc.ssl_channel_credentials())
else:
raise ValueError(
'Unsupported scheme in service metadata ("{}")'.format(
endpoint_object.scheme))
stub = state_service_pb2_grpc.FreeCallStateServiceStub(channel)
response = stub.GetFreeCallsAvailable(request)
return response.free_calls_available
def _is_free_call_available(self, email, token_for_free_call,
expiry_date_block, signature,
current_block_number, daemon_endpoint):
if self._get_no_of_free_calls_from_daemon(
email, token_for_free_call, expiry_date_block, signature,
current_block_number, daemon_endpoint) > 0:
return True
return False
def _get_daemon_endpoint_and_free_call_for_group(self, org_id, service_id,
group_id):
lambda_payload = {
"httpMethod": "GET",
"pathParameters": {
"orgId": org_id,
"serviceId": service_id
},
}
response = self.lambda_client.invoke(
FunctionName=
GET_SERVICE_DETAILS_FOR_GIVEN_ORG_ID_AND_SERVICE_ID_ARN,
InvocationType="RequestResponse",
Payload=json.dumps(lambda_payload),
)
response_body_raw = json.loads(response.get("Payload").read())["body"]
get_service_response = json.loads(response_body_raw)
if get_service_response["status"] == "success":
groups_data = get_service_response["data"].get("groups", [])
for group_data in groups_data:
if group_data["group_id"] == group_id:
return group_data["endpoints"][0][
"endpoint"], group_data.get("free_calls", 0)
raise Exception(
"Unable to fetch daemon Endpoint information for service %s under organization %s for %s group.",
service_id, org_id, group_id)
def token_to_get_free_call(self, email, org_id, service_id, group_id):
signer_public_key_checksum = Web3.toChecksumAddress(SIGNER_ADDRESS)
current_block_number = self.obj_blockchain_utils.get_current_block_no()
expiry_date_block = current_block_number + FREE_CALL_EXPIRY
token_to_get_free_call = self.obj_blockchain_utils.generate_signature_bytes(
["string", "address", "uint256"],
[email, signer_public_key_checksum, expiry_date_block], SIGNER_KEY)
signature = self.obj_blockchain_utils.generate_signature_bytes([
"string", "string", "string", "string", "string", "uint256",
"bytes32"
], [
"__prefix_free_trial", email, org_id, service_id, group_id,
current_block_number, token_to_get_free_call
], SIGNER_KEY)
daemon_endpoint, free_calls_allowed = self._get_daemon_endpoint_and_free_call_for_group(
org_id, service_id, group_id)
logger.info(
f"Got daemon endpoint {daemon_endpoint} for org {org_id} service {service_id} group {group_id}"
)
return token_to_get_free_call, expiry_date_block, signature, current_block_number, daemon_endpoint, free_calls_allowed
def token_to_make_free_call(self, email, org_id, service_id, group_id,
user_public_key):
token_to_get_free_call, expiry_date_block, signature, current_block_number, daemon_endpoint, free_calls_allowed = self.token_to_get_free_call(
email, org_id, service_id, group_id)
token_with_expiry_to_make_free_call = ""
if self._is_free_call_available(email, token_to_get_free_call,
expiry_date_block, signature,
current_block_number, daemon_endpoint):
token_with_expiry_to_make_free_call = self.obj_blockchain_utils.generate_signature_bytes(
["string", "address", "uint256"], [
email,
Web3.toChecksumAddress(user_public_key), expiry_date_block
], SIGNER_KEY)
return {
"token_to_make_free_call":
token_with_expiry_to_make_free_call.hex(),
"token_expiration_block": expiry_date_block
}
class Signer:
def __init__(self, obj_repo, net_id):
self.repo = obj_repo
self.net_id = net_id
self.lambda_client = boto3.client('lambda')
self.obj_utils = Utils()
def _free_calls_allowed(self, username, org_id, service_id):
"""
Method to check free calls exists for given user or not.
Call monitoring service to get the details
"""
try:
lambda_payload = {"httpMethod": "GET",
"queryStringParameters": {"organization_id": org_id, "service_id": service_id,
"username": username}}
response = self.lambda_client.invoke(FunctionName=GET_FREE_CALLS_METERING_ARN, InvocationType='RequestResponse',
Payload=json.dumps(lambda_payload))
response_body_raw = json.loads(
response.get('Payload').read())['body']
response_body = json.loads(response_body_raw)
free_calls_allowed = response_body["free_calls_allowed"]
total_calls_made = response_body["total_calls_made"]
is_free_calls_allowed = True if (
(free_calls_allowed - total_calls_made) > 0) else False
return is_free_calls_allowed
except Exception as e:
print(repr(e))
raise e
def signature_for_free_call(self, user_data, org_id, service_id):
"""
Method to generate signature for free call.
"""
try:
username = user_data['authorizer']['claims']['email']
if self._free_calls_allowed(username=username, org_id=org_id, service_id=service_id):
current_block_no = self.obj_utils.get_current_block_no(
ws_provider=NETWORKS[self.net_id]['ws_provider'])
provider = Web3.HTTPProvider(
NETWORKS[self.net_id]['http_provider'])
w3 = Web3(provider)
message = web3.Web3.soliditySha3(["string", "string", "string", "string", "uint256"],
[PREFIX_FREE_CALL, username, org_id, service_id, current_block_no])
if not config['private_key'].startswith("0x"):
config['private_key'] = "0x" + config['private_key']
signature = bytes(w3.eth.account.signHash(
defunct_hash_message(message), config['private_key']).signature)
signature = signature.hex()
if not signature.startswith("0x"):
signature = "0x" + signature
return {"snet-free-call-user-id": username, "snet-payment-channel-signature-bin": signature,
"snet-current-block-number": current_block_no, "snet-payment-type": "free-call"}
else:
raise Exception(
"Free calls expired for username %s.", username)
except Exception as e:
print(repr(e))
raise e
def _get_user_address(self, username):
try:
wallet_address_data = self.repo.execute("SELECT address FROM wallet WHERE username = %s AND status = 1 "
"LIMIT 1", [username])
if len(wallet_address_data) == 1:
return wallet_address_data[0]['address']
raise Exception(
"Unable to find wallet address for username %s", username)
except Exception as e:
print(repr(e))
raise e
def _get_service_metadata(self, org_id, service_id):
"""
Method to get group details for given org_id and service_id.
"""
try:
result = self.repo.execute(
"SELECT O.*, G.* FROM org_group O, service_group G WHERE O.org_id = G.org_id AND G.group_id = "
"O.group_id AND G.service_id = %s AND G.org_id = %s AND G.service_row_id IN (SELECT row_id FROM service "
"WHERE is_curated = 1 ) LIMIT 1", [org_id, service_id])
if len(result) == 1:
metadata = result[0]
payment = json.loads(metadata["payment"])
pricing = json.loads(metadata["pricing"])
metadata.update(payment)
metadata["pricing"] = pricing
return metadata
else:
raise Exception(
"Unable to find service for service_id %s", service_id)
except Exception as e:
print(repr(e))
raise e
def _get_channel_id(self, sender_address, recipient_address, group_id, signer_address):
"""
Method to fetch channel id from mpe_channel(RDS).
"""
try:
channel_data = self.repo.execute(
"SELECT channel_id FROM mpe_channel WHERE sender = %s AND recipient = %s AND "
" groupId = %s AND signer = %s LIMIT 1", [sender_address, recipient_address,
group_id, signer_address])
if len(channel_data) == 1:
return channel_data[0]["channel_id"]
raise Exception("Unable to find channels.")
except Exception as e:
print(repr(e))
raise e
def signature_for_regular_call(self, user_data, org_id, service_id):
"""
Method to generate signature for regular call.
"""
try:
username = user_data['authorizer']['claims']['email']
user_address = self._get_user_address(username=username)
metadata = self._get_service_metadata(
org_id=org_id, service_id=service_id)
recipient_address = metadata['payment']['payment_address']
channel_id = self._get_channel_id(sender_address=user_address, recipient_address=recipient_address,
group_id=metadata['group_id'], signer_address=config["signer_address"])
object_service_client = ServiceClient(
config=config, metadata=metadata, options=dict())
return object_service_client.get_service_call_metadata(channel_id=channel_id)
except Exception as e:
print(repr(e))
raise Exception(
"Unable to sign regular call for username %s", username)
