class Agent:
"""
An Aries CloudAgent object
This object has all the tools needed to interact with the ledger.
1. It sets-up a docker container,
2. It sets-up a webhook server to handle incoming communications
3. It has a build-in API handler to handle interaction with the ledger
"""
def __init__(
self,
identity: str,
start_port: int,
transport_protocol: str,
endpoint: str,
ledger_url: str,
local_ip: str,
wallet_name: str,
wallet_key: str,
seed: str = "random",
public_did: bool = True,
auto_response: bool = False,
):
# Construct docker container object to maintain a running container
self.docker_container = Container(
identity=identity,
endpoint=endpoint,
seed=seed,
indbound_transport_port=start_port,
outbound_transport_port=start_port + 1,
transport_protocol=transport_protocol,
wallet_name=wallet_name,
wallet_key=wallet_key,
webhook_url=
f"{transport_protocol}://{local_ip}:{start_port+2}/webhooks", #TODO:
genesis_url=f"{ledger_url}/genesis")
# Construct Api Handler object that handles all Api calls
self.api_handler = ApiHandler( # TODO: Ledger transport protocol toevoegen
api_url=local_ip,
port=start_port + 1)
# Construct a webhook server object that handles incoming messages
self.webhook_server = WebhookServer(
identity=identity,
webhook_ip=local_ip,
webhook_protocol=transport_protocol,
webhook_port=start_port + 2,
api_handler=self.api_handler
) # TODO: webhook IP is not per definitie gelijk aan ledger ip
self.identity = identity
self.start_port = start_port
self.ledger_url = ledger_url
self.local_ip = local_ip
self.seed = seed
self.public_did = public_did
self.auto_response = auto_response
# TODO: Register DID weghalen en verplaatsen naar api handler
self.client_session = ClientSession()
self.transport_protocol = transport_protocol
# TODO: random seed ja?
rand_name = str(random.randint(100_000, 999_999))
self.seed = (("my_seed_000000000000000000000000" +
rand_name)[-32:] if seed == "random" else seed)
async def initialize(self) -> None:
"""
Start a webhook server, register a DID and start a docker container process
"""
await self.webhook_server.start_process()
await self.register_did()
await self.docker_container.start_process()
# TODO: Timeout toevoegen, wanneer verkeerde key wordt gegeven, geeft hij alsog aan dat er een goeie connectie is
if self.api_handler.test_connection() is False:
return
self.admin_url = f"{self.transport_protocol}://{self.local_ip}:{self.start_port+1}"
self.endpoint = f"{self.transport_protocol}://{self.local_ip}:{self.start_port}"
log_msg(f"Admin URL is at: {self.admin_url}", color=LOG_COLOR)
log_msg(f"Endpoint URL is at: {self.endpoint}", color=LOG_COLOR)
async def connections(self,
*,
alias_query: str = None,
invitation_key_query: str = None,
my_did_query: str = None,
connection_state_query: str = None,
their_did_query: str = None,
their_role_query: str = None) -> dict:
"""
List and Query agent-to-agent connections
Function can be called with no KWARGS to list ALL conenctions
Function can also be called with KWARGS to query the list of connections
:param alias_query: Only list connections with this alias
:param invitation_key_query: Only list connections with this invitation key
:param my_did_query: Only list connections with this "my did" value
:param connection_state_query: Only list connections with this connection state
:param their_did_query: Only list connections with this "their did" value
:param their_role_query: Only list connections with this "their role" value
:return: Queried list of agent-to-agent connections with their states
"""
return self.api_handler.connections(
alias_query=alias_query,
invitation_key_query=invitation_key_query,
my_did_query=my_did_query,
connection_state_query=connection_state_query,
their_did_query=their_did_query,
their_role_query=their_did_query)
async def generate_invitation(self,
auto_accept: bool = True,
multi_use: bool = False,
display_qr: bool = False) -> tuple:
"""
Create a connection invitation
:param auto_accept: Auto accept connection handshake?
:param multi_use: Can this invite be used multiple times?
:param display_qr: Bool to indicate whether a QR code should be displayed in the terminal
:return: A tuple containing the connection id and base64 encoded invite url
"""
invitation_id, invitation = self.api_handler.create_invitation(
alias=self.identity, multi_use=multi_use, auto_accept=auto_accept)
if display_qr:
qr = QRCode(border=1)
qr.add_data(json.dumps(invitation))
log_msg(
f"Use the following JSON to accept the invite from another demo agent. Or use the QR code to connect from a mobile agent.",
color=LOG_COLOR)
log_msg(f"Invitation Data:",
json.dumps(invitation),
color=LOG_COLOR)
qr.print_ascii(invert=True)
return invitation_id, invitation
async def send_message(self, connection_id: str, message: str):
"""
Send a message to another connected agent
:param connection_id: The connection id of the connection between this agent and the connected agent
:param message: Message to send to the other agent
:return: Response of the operation
"""
connection_id = await prompt(
"Send message to <connection id> :"
) # TODO: Throw exception when invitation is invalid
message = await prompt("Message <message>:")
self.api_handler.send_message(connection_id, message)
async def create_schema(self, schema: dict = None) -> dict:
"""
Create a schema on the ACA-Py instance
:param schema: The schema to create
:return: The created schema as a dict
"""
schema = await prompt("Schema :"
) # TODO: Throw exception when schema is invalid
schema = json.loads(schema)
return self.api_handler.create_schema(schema)
async def create_credential_definition(
self,
schema_id: str = None,
schema_tag: str = None,
support_revocation: bool = False) -> str:
"""
Create a credentials definition on the Ledger
:param schema_id: The id of the schema that the credential definition needs to be created from
:param schema_tag: The tag of the schema
:param supports_revocation: Bool to indicate if the credential definition needs to support revocation or not
"""
schema_id = await prompt(
"Schema ID <id>:"
) # TODO: Throw exception when invitation is invalid
schema_tag = await prompt(
"Schema tag <tag>:"
) # TODO: Throw exception when invitation is invalid
return self.api_handler.create_credential_definition(
schema_id, schema_tag, support_revocation)
async def issue_credential(self) -> dict:
"""
Issue a credential to one of the agent. Promts the user for inputs.
:return: The result of the issue credential operation
"""
connection_id = await prompt("Connection ID <id>: ")
cred_def_id = await prompt("Connection definition ID <id>: ")
schema = json.loads(await prompt("Schema <schema>: "))
log_msg(schema)
attributes = json.loads(await prompt("Attributes <attributes>: "))
log_msg(attributes)
return self.api_handler.issue_credential(connection_id, cred_def_id,
attributes, schema)
async def get_credentials(self):
return self.api_handler.get_credentials()
async def register_did(self,
ledger_ip: str = None,
alias: str = None,
did: str = None,
verkey: str = None,
role: str = "TRUST_ANCHOR"):
"""
Function registers a DID on the ledger
:param ledger_url: The ledger_url of the ledger
:param alias: The alias to gerister on the ledger
:param did: Did to register
:param verkey: Verkey to register
:param role: role of the registered DID
:raises Exception: raises an exception when an invalid response is given by the ledger
"""
log_msg(f"Registering {self.identity} ...", color=LOG_COLOR)
data = {"alias": alias or self.identity, "role": role}
if did and verkey:
data["did"] = did
data["verkey"] = verkey
else:
data["seed"] = self.seed
async with self.client_session.post(f"{self.ledger_url}/register",
json=data) as resp:
if resp.status != 200:
raise Exception(
f"Error registering DID, response code {resp.status}")
nym_info = await resp.json()
self.did = nym_info["did"]
log_msg(f"nym_info: {nym_info}", color=LOG_COLOR)
log_msg(f"Registered DID: {self.did}", color=LOG_COLOR)
async def receive_invitation(self,
invitation,
alias=None,
auto_accept=False) -> str:
"""
Receive invitation url
:param invitation: The base64 encoded invite url str
:param alias: The alias to give to the connection as a str
:param auto_accept: Auto accept connection handshake?
:return: The connection id as a str
"""
# TODO: Throw exception when invitation is invalid
invitation = await prompt("Invite details: ")
auto_accept = await prompt("Auto accept invitation? n/y: ")
if auto_accept == "y":
auto_accept = True
else:
auto_accept = False
return self.api_handler.receive_invitation(invitation_url=invitation,
alias=self.identity,
auto_accept=True)
async def get_connection_state(self, connection_id) -> int:
"""
Get the connection state of a given connection id
:param connection_id: The connection id
:return: The state (see states dict)
"""
# TODO: Throw exception when connection_id is invalid
connection_id = await prompt("Connection state: ")
return self.api_handler.get_connection_state(connection_id)
async def terminate(self):
"""
Terminate the Agent by closing the admin API, webhook server and docker container.
:return: True if termination is complete
"""
log_msg(f"Shutting down {self.identity}", color=LOG_COLOR)
await self.client_session.close() # Close session to admin api
await self.webhook_server.terminate() # Shut down web hooks first
await self.docker_container.terminate() # now shut down the agent
return True
schema_id, schema_tag, False)
log_msg(f"credential def id: {cred_def_id}", color=LOG_COLOR)
elif int(option) == 8:
connection_id = input("Connection ID <id>: ")
cred_def_id = input("Connection definition ID <id>: ")
schema = json.loads(
input("Schema <schema>: ").replace("'", '"'))
log_msg(schema)
attributes = json.loads(input("Attributes <attributes>: "))
log_msg(attributes)
credential = api_handler.issue_credential(
connection_id, cred_def_id, attributes, schema)
log_msg(
f"Credential exchange id: {credential['credential_exchange_id']}",
color=LOG_COLOR)
elif int(option) == 9:
credentials = api_handler.get_credentials()
log_msg(
f"There is/are {len(credentials['results'])} credential(s)",
color=LOG_COLOR)
for i in range(len(credentials['results'])):
log_msg(
f"\tCredential: {credentials['results'][i]['attrs']}",
color=LOG_COLOR)
elif int(option) == 10:
break
except:
pass