issue_credential.py

import json
import uuid
from datetime import datetime, timedelta

from didkit import issue_credential, key_to_did, key_to_verification_method


async def req_issue_vc(request):
    """Issues a Verifiable VC using SpruceID DIDKit
    Args:
        request (flask.Request): Flask API request containing
        None (Issue via server) or
        QRcode url

    Returns:
        Dict: Generated VC from DIDKit issue_credential
    """
    with open("key.jwk", "r") as f:
        key = f.readline()
    f.close()

    did_key = request.form.get("subject_id", key_to_did("key", key))
    verification_method = await key_to_verification_method("key", key)
    issuance_date = datetime.utcnow().replace(microsecond=0)
    expiration_date = issuance_date + timedelta(weeks=24)

    credential = {
        "id": "urn:uuid:" + uuid.uuid4().__str__(),
        "@context": [
            "https://www.w3.org/2018/credentials/v1",
            "https://www.w3.org/2018/credentials/examples/v1",
        ],
        "type": ["VerifiableCredential"],
        "issuer": did_key,
        "issuanceDate": issuance_date.isoformat() + "Z",
        "expirationDate": expiration_date.isoformat() + "Z",
        "credentialSubject": {
            "@context": [{"username": "https://schema.org/Text"}],
            "id": "urn:uuid:" + uuid.uuid4().__str__(),
            "username": "Someone",
        },
    }

    didkit_options = {
        "proofPurpose": "assertionMethod",
        "verificationMethod": verification_method,
    }

    credential = await issue_credential(
        credential.__str__().replace("'", '"'),
        didkit_options.__str__().replace("'", '"'),
        key,
    )
    return json.loads(credential)