"""Credential offer message handler."""
from .....wallet.util import default_did_from_verkey
from .....core.oob_processor import OobMessageProcessor
from .....indy.holder import IndyHolderError
from .....ledger.error import LedgerError
from .....messaging.base_handler import BaseHandler, HandlerException
from .....messaging.models.base import BaseModelError
from .....messaging.request_context import RequestContext
from .....messaging.responder import BaseResponder
from .....storage.error import StorageError
from .....utils.tracing import trace_event, get_timer
from .. import problem_report_for_record
from ..manager import V20CredManager, V20CredManagerError
from ..messages.cred_offer import V20CredOffer
from ..messages.cred_problem_report import ProblemReportReason
[docs]class V20CredOfferHandler(BaseHandler):
"""Message handler class for credential offers."""
[docs] async def handle(self, context: RequestContext, responder: BaseResponder):
"""
Message handler logic for credential offers.
Args:
context: request context
responder: responder callback
"""
r_time = get_timer()
self._logger.debug("V20CredOfferHandler called with context %s", context)
assert isinstance(context.message, V20CredOffer)
self._logger.info(
"Received v2.0 credential offer message: %s",
context.message.serialize(as_string=True),
)
# If connection is present it must be ready for use
if context.connection_record and not context.connection_ready:
raise HandlerException("Connection used for credential offer not ready")
# Find associated oob record
oob_processor = context.inject(OobMessageProcessor)
oob_record = await oob_processor.find_oob_record_for_inbound_message(context)
# Either connection or oob context must be present
if not context.connection_record and not oob_record:
raise HandlerException(
"No connection or associated connectionless exchange found for credential"
" offer"
)
connection_id = (
context.connection_record.connection_id
if context.connection_record
else None
)
profile = context.profile
cred_manager = V20CredManager(profile)
cred_ex_record = await cred_manager.receive_offer(
context.message, connection_id
) # mgr only finds, saves record: on exception, saving state null is hopeless
r_time = trace_event(
context.settings,
context.message,
outcome="V20CredOfferHandler.handle.END",
perf_counter=r_time,
)
if context.connection_record:
holder_did = context.connection_record.my_did
else:
# Transform recipient key into did
holder_did = default_did_from_verkey(oob_record.our_recipient_key)
# If auto respond is turned on, automatically reply with credential request
if context.settings.get("debug.auto_respond_credential_offer"):
cred_request_message = None
try:
(_, cred_request_message) = await cred_manager.create_request(
cred_ex_record=cred_ex_record,
holder_did=holder_did,
)
await responder.send_reply(cred_request_message)
except (
BaseModelError,
IndyHolderError,
LedgerError,
StorageError,
V20CredManagerError,
) as err:
self._logger.exception("Error responding to credential offer")
if cred_ex_record:
async with profile.session() as session:
await cred_ex_record.save_error_state(
session,
reason=err.roll_up, # us: be specific
)
await responder.send_reply(
problem_report_for_record(
cred_ex_record,
ProblemReportReason.ISSUANCE_ABANDONED.value, # them: vague
)
)
trace_event(
context.settings,
cred_request_message,
outcome="V20CredOfferHandler.handle.REQUEST",
perf_counter=r_time,
)