Unable to receive connectionless out-of-band invitation

[TimoGlastra]

When receiving an out-of-band invitation containing a proof-request without any handshake_protocols I get an error No existing connection exists and handshake_protocol is missing. This leads me to believe connectionless out of band invitations are not supported in ACA-Py.

Also looking at the code it seems to only process the attached message if there is a connection record:

        # Request Attach
        if len(invitation.requests_attach) >= 1 and conn_rec is not None

Are connectionless exchanges initiated through out of band not supported yet? Am I using it incorectly?

Here is the full error:

2022-02-21 13:40:13,192 aries_cloudagent.admin.server DEBUG Body: {
    "@type": "did:sov:BzCbsNYhMrjHiqZDTUASHg;spec/out-of-band/1.0/invitation",
    "@id": "dc81a186-908a-449a-a2b5-d8ed1a0c6a88",
    "label": "Aries Cloud Agent",
    "services": [
      {
        "id": "#inline",
        "type": "did-communication",
        "recipientKeys": [
          "did:key:z6MkrBLdrjur8fgA9TGSCXaKNoU8zi3hiu1hozfbgLALfXty"
        ],
        "serviceEndpoint": "ws://localhost:4000"
      }
    ],
    "requests~attach": [
      {
        "@id": "request-0",
        "mime-type": "application/json",
        "data": {
          "json": {
            "@type": "did:sov:BzCbsNYhMrjHiqZDTUASHg;spec/present-proof/2.0/request-presentation",
            "@id": "9203ebcc-e54c-4a61-9a4a-6ede677a3b6d",
            "request_presentations~attach": [
              {
                "@id": "indy",
                "mime-type": "application/json",
                "data": {
                  "base64": "eyJuYW1lIjogIlByb29mIHJlcXVlc3QiLCAicmVxdWVzdGVkX2F0dHJpYnV0ZXMiOiB7ImFkZGl0aW9uYWxQcm9wMSI6IHsibmFtZSI6ICJmYXZvdXJpdGVEcmluayIsICJyZXN0cmljdGlvbnMiOiBbXX19LCAicmVxdWVzdGVkX3ByZWRpY2F0ZXMiOiB7fSwgInZlcnNpb24iOiAiMS4wIiwgIm5vbmNlIjogIjEwNzI2NDI0ODkxMTI2OTA4OTAyMTk0NyJ9"
                }
              }
            ],
            "will_confirm": true,
            "formats": [
              {
                "attach_id": "indy",
                "format": "hlindy/[email protected]"
              }
            ]
          }
        }
      }
    ]
  }
2022-02-21 13:40:13,199 aries_cloudagent.core.dispatcher ERROR Handler error: invitation_receive
Traceback (most recent call last):
  File "/Users/timo/Developer/Work/Projects/AFJ/aries-cloudagent-python/aries_cloudagent/protocols/out_of_band/v1_0/routes.py", line 221, in invitation_receive
    result = await oob_mgr.receive_invitation(
  File "/Users/timo/Developer/Work/Projects/AFJ/aries-cloudagent-python/aries_cloudagent/protocols/out_of_band/v1_0/manager.py", line 563, in receive_invitation
    raise OutOfBandManagerError(
aries_cloudagent.protocols.out_of_band.v1_0.manager.OutOfBandManagerError: No existing connection exists and handshake_protocol is missing
2022-02-21 13:40:13,203 aries_cloudagent.admin.server ERROR Handler error with exception: No existing connection exists and handshake_protocol is missing

=================

Here's the endpoints I'm calling (doesn't need any setup):

POST /present-proof-2.0/create-request

{
  "presentation_request": {
    "indy": {
      "name": "Proof request",
      "requested_attributes": {
        "additionalProp1": {
          "name": "favouriteDrink",
          "restrictions": []
        }
      },
      "requested_predicates": {},
      "version": "1.0"
    }
  }
}

POST /out-of-band/create-invitation

Replace id with the pres_ex_id from previous step

{
  "attachments": [
    {
      "id": "8aa67942-7d92-444b-984b-215782cbc3aa",
      "type": "present-proof"
    }
  ]
}

POST /out-of-band/receive-invitation

Replace body with invitation from previous step

{
    "@type": "did:sov:BzCbsNYhMrjHiqZDTUASHg;spec/out-of-band/1.0/invitation",
    "@id": "dc81a186-908a-449a-a2b5-d8ed1a0c6a88",
    "label": "Aries Cloud Agent",
    "services": [
      {
        "id": "#inline",
        "type": "did-communication",
        "recipientKeys": [
          "did:key:z6MkrBLdrjur8fgA9TGSCXaKNoU8zi3hiu1hozfbgLALfXty"
        ],
        "serviceEndpoint": "ws://localhost:4000"
      }
    ],
    "requests~attach": [
      {
        "@id": "request-0",
        "mime-type": "application/json",
        "data": {
          "json": {
            "@type": "did:sov:BzCbsNYhMrjHiqZDTUASHg;spec/present-proof/2.0/request-presentation",
            "@id": "9203ebcc-e54c-4a61-9a4a-6ede677a3b6d",
            "request_presentations~attach": [
              {
                "@id": "indy",
                "mime-type": "application/json",
                "data": {
                  "base64": "eyJuYW1lIjogIlByb29mIHJlcXVlc3QiLCAicmVxdWVzdGVkX2F0dHJpYnV0ZXMiOiB7ImFkZGl0aW9uYWxQcm9wMSI6IHsibmFtZSI6ICJmYXZvdXJpdGVEcmluayIsICJyZXN0cmljdGlvbnMiOiBbXX19LCAicmVxdWVzdGVkX3ByZWRpY2F0ZXMiOiB7fSwgInZlcnNpb24iOiAiMS4wIiwgIm5vbmNlIjogIjEwNzI2NDI0ODkxMTI2OTA4OTAyMTk0NyJ9"
                }
              }
            ],
            "will_confirm": true,
            "formats": [
              {
                "attach_id": "indy",
                "format": "hlindy/[email protected]"
              }
            ]
          }
        }
      }
    ]
  }

[swcurran]

@shaangill025, @andrewwhitehead -- we need to get this going. Anything related to OOB support and DID Exchange needs to be ready in ACA-Py as soon as possible, as we do the Community Transition from Connections.

[TimoGlastra]

@shaangill025 or @andrewwhitehead is one of you already working on this? If not, I can take a look at this.

[swcurran]

@TimoGlastra -- I would say go ahead. I don't think this is high on the list.

[swcurran]

But as I read my previous statement and think about it -- it needs to be higher. :-(

[shaangill025]

@TimoGlastra I can take this on today if you haven't already started working on this?

[TimoGlastra]

I already started the work. It's more work than I initially thought, so I may hand it off if I run out of time :)

But I'll try to finish it first. Thanks!

[shaangill025]

With #1676 , I have fixed an issue where unused connections were not deleted when OOB invitation contains request attachments. This might relate to your current work.