"""Presentation request message handler."""
from .....indy.holder import IndyHolder, IndyHolderError
from .....indy.models.xform import indy_proof_req_preview2indy_requested_creds
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, StorageNotFoundError
from .....utils.tracing import trace_event, get_timer
from .....wallet.error import WalletNotFoundError
from .. import problem_report_for_record
from ..manager import PresentationManager
from ..messages.presentation_request import PresentationRequest
from ..messages.presentation_problem_report import ProblemReportReason
from ..models.presentation_exchange import V10PresentationExchange
[docs]class PresentationRequestHandler(BaseHandler):
"""Message handler class for Aries#0037 v1.0 presentation requests."""
[docs] async def handle(self, context: RequestContext, responder: BaseResponder):
"""
Message handler logic for Aries#0037 v1.0 presentation requests.
Args:
context: request context
responder: responder callback
"""
r_time = get_timer()
self._logger.debug("PresentationRequestHandler called with context %s", context)
assert isinstance(context.message, PresentationRequest)
self._logger.info(
"Received presentation request message: %s",
context.message.serialize(as_string=True),
)
if not context.connection_ready:
raise HandlerException("No connection established for presentation request")
presentation_manager = PresentationManager(context.profile)
indy_proof_request = context.message.indy_proof_request(0)
# Get presentation exchange record (holder initiated via proposal)
# or create it (verifier sent request first)
try:
async with context.session() as session:
(
presentation_exchange_record
) = await V10PresentationExchange.retrieve_by_tag_filter(
session,
{"thread_id": context.message._thread_id},
{"connection_id": context.connection_record.connection_id},
) # holder initiated via proposal
except StorageNotFoundError: # verifier sent this request free of any proposal
presentation_exchange_record = V10PresentationExchange(
connection_id=context.connection_record.connection_id,
thread_id=context.message._thread_id,
initiator=V10PresentationExchange.INITIATOR_EXTERNAL,
role=V10PresentationExchange.ROLE_PROVER,
presentation_request=indy_proof_request,
presentation_request_dict=context.message.serialize(),
auto_present=context.settings.get(
"debug.auto_respond_presentation_request"
),
trace=(context.message._trace is not None),
)
presentation_exchange_record.presentation_request = indy_proof_request
presentation_exchange_record = await presentation_manager.receive_request(
presentation_exchange_record
) # mgr only saves record: on exception, saving state null is hopeless
r_time = trace_event(
context.settings,
context.message,
outcome="PresentationRequestHandler.handle.END",
perf_counter=r_time,
)
# If auto_present is enabled, respond immediately with presentation
if presentation_exchange_record.auto_present:
presentation_preview = None
if presentation_exchange_record.presentation_proposal_dict:
exchange_pres_proposal = (
presentation_exchange_record.presentation_proposal_dict
)
presentation_preview = exchange_pres_proposal.presentation_proposal
try:
req_creds = await indy_proof_req_preview2indy_requested_creds(
indy_proof_request,
presentation_preview,
holder=context.inject(IndyHolder),
)
except ValueError as err:
self._logger.warning(f"{err}")
return # not a protocol error: prover could still build proof manually
presentation_message = None
try:
(
presentation_exchange_record,
presentation_message,
) = await presentation_manager.create_presentation(
presentation_exchange_record=presentation_exchange_record,
requested_credentials=req_creds,
comment="auto-presented for proof request nonce={}".format(
indy_proof_request["nonce"]
),
)
await responder.send_reply(presentation_message)
except (
BaseModelError,
IndyHolderError,
LedgerError,
StorageError,
WalletNotFoundError,
) as err:
self._logger.exception(err)
if presentation_exchange_record:
async with context.session() as session:
await presentation_exchange_record.save_error_state(
session,
reason=err.roll_up, # us: be specific
)
await responder.send_reply(
problem_report_for_record(
presentation_exchange_record,
ProblemReportReason.ABANDONED.value, # them: be vague
)
)
trace_event(
context.settings,
presentation_message,
outcome="PresentationRequestHandler.handle.PRESENT",
perf_counter=r_time,
)