"""Basic message handler."""
import json
from ...base_handler import BaseHandler, BaseResponder, RequestContext
from ..manager import PresentationManager
from ..messages.presentation_request import PresentationRequest
from ....holder.base import BaseHolder
[docs]class PresentationRequestHandler(BaseHandler):
"""Message handler class for presentation requests."""
[docs] async def handle(self, context: RequestContext, responder: BaseResponder):
"""
Message handler logic for presentation requests.
Args:
context: request context
responder: responder callback
"""
self._logger.debug(f"PresentationRequestHandler called with context {context}")
assert isinstance(context.message, PresentationRequest)
self._logger.info("Received presentation request: %s", context.message.request)
presentation_manager = PresentationManager(context)
presentation_exchange_record = await presentation_manager.receive_request(
context.message, context.connection_record.connection_id
)
# If auto_respond_presentation_request is set, try to build a presentation
# This will fail and bail out if there isn't exactly one credential returned
# for each requested attribute and predicate. All credential data will be
# revealed.
if context.settings.get("debug.auto_respond_presentation_request"):
holder: BaseHolder = await context.inject(BaseHolder)
credentials_for_presentation = {
"self_attested_attributes": {},
"requested_attributes": {},
"requested_predicates": {},
}
presentation_request = json.loads(context.message.request)
for referent in presentation_request["requested_attributes"]:
(
credentials
) = await holder.get_credentials_for_presentation_request_by_referent(
presentation_request, (referent,), 0, 2, {}
)
if len(credentials) != 1:
self._logger.warning(
f"Could not automatically construct presentation for"
+ f" presentation request {presentation_request['name']}"
+ f":{presentation_request['version']} because referent "
+ f"{referent} did not produce exactly one credential result."
+ f" {len(credentials)} credentials were returned from the "
+ f"wallet."
)
return
credentials_for_presentation["requested_attributes"][referent] = {
"cred_id": credentials[0]["cred_info"]["referent"],
"revealed": True,
}
for referent in presentation_request["requested_predicates"]:
(
credentials
) = await holder.get_credentials_for_presentation_request_by_referent(
presentation_request, (referent,), 0, 2, {}
)
if len(credentials) != 1:
self._logger.warning(
f"Could not automatically construct presentation for"
+ f" presentation request {presentation_request['name']}"
+ f":{presentation_request['version']} because referent "
+ f"{referent} did not produce exactly one credential result."
+ f" {len(credentials)} credentials were returned from the "
+ f"wallet."
)
return
credentials_for_presentation["requested_predicates"][referent] = {
"cred_id": credentials[0]["cred_info"]["referent"],
"revealed": True,
}
(
presentation_exchange_record,
presentation_message,
) = await presentation_manager.create_presentation(
presentation_exchange_record, credentials_for_presentation
)
await responder.send_reply(presentation_message)