OIDC4VP : Verifier requests user to choose VCs among several types of VCs

[ThierryThevenet]

Example , the verifier request from the user an EmailPass OR a PhoneProof.
This behavior is different from the standard behavior which is that all input_descriptors MUST be fulfilled separatly.

In all those cases which are not standard, there is json object name "submission_requirements" which is added to the presentation_definition

the presentation definition of the request will look like that :

{
"id": "9920a04d-3d24-11ee-ae7e-0a1628958560",
"input_descriptors": [
{
"id": "emailpass_5",
"group": [
"A"
],
"name": "Input descriptor for credential 5",
"constraints": {
"fields": [
{
"path": [
"$.credentialSubject.type"
],
"filter": {
"type": "string",
"pattern": "EmailPass"
}
}
]
}
},
{
"id": "phoneproof_6",
"group": [
"A"
],
"name": "Input descriptor for credential 6",
"constraints": {
"fields": [
{
"path": [
"$.credentialSubject.type"
],
"filter": {
"type": "string",
"pattern": "PhoneProof"
}
}
]
}
}
],
"name": "Test #5 DEFAULT",
"purpose": "Altme presentation definition subset of PEX v2.0",
"submission_requirements": [
{
"name": "Group A",
"rule": "pick",
"count": 1,
"from": "A"
}
],
"format": ............................
}
}

The main difference is the
"submission_requirements": [
{
"name": "Group A",
"rule": "pick",
"count": 1,
"from": "A"
}
],

Which means that the verifier wants the user to pick 1 VC in Group A

and Groupe A is added to the description of each VC with 
  "group": [
            "A"
        ],
        
       In that case the wallet present the EmailPass and PhoneProof on teh same screen and user choose one OR the other one.

[ThierryThevenet]

Test #5

[ThierryThevenet]

So if the wallet must check if there is a "submission_requirement" attribute in the presentation definition.
If yes there are added rules between input_descriptor if not : it is the current behavior -> all input_descriptors must be satisfied separatly

[ThierryThevenet]

when the submission_requirement is present in a presentation_definition , all input_descriptors must be grouped.
if not the wallet can ignore it.

[ThierryThevenet]

Other submission possible

"submission_requirements": [
{
"name": "test with group A",
"rule": "pick",
"min": 2,
"from": "A"
}
]
Means that user must choose a minimum of 2 VCs in group A

[ThierryThevenet]

Other submission possible

"submission_requirements": [
{
"name": "test with group A",
"rule": "pick",
"min": 2,
"from": "A"
},
{
"name": "test with group B",
"rule": "pick",
"count": 1,
"from": "B"
}
]

Means that user must choose a minimum of 2 VCs in group A AND user must chose 1 VC from group B