Add vcdm 2.0 model and context

[PatStLouis]

Needs issuanceDate validation for vcdm 1.0 (add a current timestamp if absent)
Needs hooking up with didcomm

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[ff137]

Just some early review comments

[ff137]

This can maybe be made more legible with:

    def __eq__(self, o: object) -> bool:
        """Check equality."""
        if not isinstance(o, VerifiableCredential):
            return False

        return all(
            getattr(self, attr) == getattr(o, attr)
            for attr in vars(self)
        )

or, if vars(self) returns extra properties that should be ignored, then define the relevant attributes in a list:

    def __eq__(self, o: object) -> bool:
        """Check equality."""
        if not isinstance(o, VerifiableCredential):
            return False

        attributes = [
            "context", "id", "type", "issuer", "issuance_date",
            "expiration_date", "valid_from", "valid_until",
            "credential_subject", "credential_status", "proof", "extra"
        ]

        return all(
            getattr(self, attr) == getattr(o, attr)
            for attr in attributes
        )

[ff137]

If value is None, there would be a TypeError.

Probably worth asserting that value is of expected type before calling len or [0].
(because a dev could try call with a string, and get unclear error message).

Something like:

    def __call__(self, value: List[str]) -> List[str]:
        """Validate input value."""
        if not isinstance(value, list):
            raise ValidationError("Value must be a non-empty list.")

        if not value or value[0] not in CredentialContext.FIRST_CONTEXT:
            raise ValidationError(
                f"First context must be one of {CredentialContext.FIRST_CONTEXT}"
            )

        return value

[ff137]

Perhaps rename to a VALID_CONTEXTS?

[ff137]

Perhaps better to have options.proof_type != Ed25519Signature2020.signature_type