import asyncio import datetime import didkit import json import jinja2 from django.template.backends.django import Template def generate_did_controller_key(): return didkit.generate_ed25519_key() def keydid_from_controller_key(key): return didkit.key_to_did("key", key) def generate_generic_vc_id(): # TODO agree on a system for Verifiable Credential IDs return "https://pangea.org/credentials/42" def render_and_sign_credential(vc_template: jinja2.Template, jwk_issuer, vc_data: dict[str, str]): """ Populates a VC template with data for issuance, and signs the result with the provided key. The `vc_data` parameter must at a minimum include: * issuer_did * subject_did * vc_id and must include whatever other fields are relevant for the vc_template to be instantiated. The following field(s) will be auto-generated if not passed in `vc_data`: * issuance_date (to `datetime.datetime.now()`) """ async def inner(): unsigned_vc = vc_template.render(vc_data) signed_vc = await didkit.issue_credential( unsigned_vc, '{"proofFormat": "ldp"}', jwk_issuer ) return signed_vc if vc_data.get("issuance_date") is None: vc_data["issuance_date"] = datetime.datetime.now().replace(microsecond=0).isoformat() return asyncio.run(inner()) def sign_credential(unsigned_vc: str, jwk_issuer): """ Signs the and unsigned credential with the provided key. """ async def inner(): signed_vc = await didkit.issue_credential( unsigned_vc, '{"proofFormat": "ldp"}', jwk_issuer ) return signed_vc return asyncio.run(inner()) def verify_credential(vc, proof_options): """ Returns a (bool, str) tuple indicating whether the credential is valid. If the boolean is true, the credential is valid and the second argument can be ignored. If it is false, the VC is invalid and the second argument contains a JSON object with further information. """ async def inner(): return didkit.verify_credential(vc, proof_options) return asyncio.run(inner()) def issue_verifiable_presentation(vc_list: list[str], jwk_holder: str, holder_did: str) -> str: async def inner(): unsigned_vp = unsigned_vp_template.render(data) signed_vp = await didkit.issue_presentation( unsigned_vp, '{"proofFormat": "ldp"}', jwk_holder ) return signed_vp # TODO: convert from Jinja2 -> django-templates env = Environment( loader=FileSystemLoader("vc_templates"), autoescape=select_autoescape() ) unsigned_vp_template = env.get_template("verifiable_presentation.json") data = { "holder_did": holder_did, "verifiable_credential_list": "[" + ",".join(vc_list) + "]" } return asyncio.run(inner()) def verify_presentation(vp): """ Returns a (bool, str) tuple indicating whether the credential is valid. If the boolean is true, the credential is valid and the second argument can be ignored. If it is false, the VC is invalid and the second argument contains a JSON object with further information. """ async def inner(): proof_options = '{"proofFormat": "ldp"}' return didkit.verify_presentation(vp, proof_options) return asyncio.run(inner())