import asyncio import datetime from typing import Any import didkit import json import jinja2 from jinja2 import Environment, FileSystemLoader, select_autoescape from ast import literal_eval 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" async def resolve_keydid(keydid): return await didkit.resolve_did(keydid, "{}") def webdid_from_controller_key(key): """ Se siguen los pasos para generar un webdid a partir de un keydid. Documentado en la docu de spruceid. """ keydid = keydid_from_controller_key(key) # "did:key:<...>" pubkeyid = keydid.rsplit(":")[-1] # <...> document = json.loads(asyncio.run(resolve_keydid(keydid))) # Documento DID en terminos "key" webdid_url = f"did:web:idhub.pangea.org:{pubkeyid}" # nueva URL: "did:web:idhub.pangea.org:<...>" webdid_url_owner = webdid_url + "#owner" # Reemplazamos los campos del documento DID necesarios: document["id"] = webdid_url document["verificationMethod"][0]["id"] = webdid_url_owner document["verificationMethod"][0]["controller"] = webdid_url document["authentication"][0] = webdid_url_owner document["assertionMethod"][0] = webdid_url_owner document_fixed_serialized = json.dumps(document) return webdid_url, document_fixed_serialized def render_and_sign_credential(unsigned_vc: dict, jwk_issuer): """ 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(): signed_vc = await didkit.issue_credential( json.dumps(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 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): """ Returns a (bool, str) tuple indicating whether the credential is valid. Checks performed: * The credential is valid in signature and form, and * The credential validates itself against its declared schema. 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 string (which is a valid JSON object) with further information. """ async def inner(): str_res = await didkit.verify_credential(vc, '{"proofFormat": "ldp"}') res = literal_eval(str_res) ok = res["warnings"] == [] and res["errors"] == [] return ok, str_res (ok, res) = asyncio.run(inner()) if not ok: # The credential doesn't pass signature checks, so early return return ok, res return ok, res 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 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 await didkit.verify_presentation(vp, proof_options) return asyncio.run(inner())