147 lines
4.6 KiB
Python
147 lines
4.6 KiB
Python
import asyncio
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import datetime
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import didkit
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import json
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import jinja2
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from django.template.backends.django import Template
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from django.template.loader import get_template
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from trustchain_idhub import settings
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def generate_did_controller_key():
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return didkit.generate_ed25519_key()
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def keydid_from_controller_key(key):
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return didkit.key_to_did("key", key)
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async def resolve_keydid(keydid):
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return await didkit.resolve_did(keydid, "{}")
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def webdid_from_controller_key(key):
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"""
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Se siguen los pasos para generar un webdid a partir de un keydid.
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Documentado en la docu de spruceid.
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"""
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keydid = keydid_from_controller_key(key) # "did:key:<...>"
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pubkeyid = keydid.rsplit(":")[-1] # <...>
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document = json.loads(asyncio.run(resolve_keydid(keydid))) # Documento DID en terminos "key"
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webdid_url = f"did:web:{settings.DOMAIN}:did-registry:{pubkeyid}" # nueva URL: "did:web:idhub.pangea.org:<...>"
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webdid_url_owner = webdid_url + "#owner"
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# Reemplazamos los campos del documento DID necesarios:
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document["id"] = webdid_url
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document["verificationMethod"][0]["id"] = webdid_url_owner
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document["verificationMethod"][0]["controller"] = webdid_url
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document["authentication"][0] = webdid_url_owner
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document["assertionMethod"][0] = webdid_url_owner
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document_fixed_serialized = json.dumps(document)
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return webdid_url, document_fixed_serialized
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def generate_generic_vc_id():
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# TODO agree on a system for Verifiable Credential IDs
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return "https://pangea.org/credentials/42"
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def render_and_sign_credential(vc_template: jinja2.Template, jwk_issuer, vc_data: dict[str, str]):
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"""
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Populates a VC template with data for issuance, and signs the result with the provided key.
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The `vc_data` parameter must at a minimum include:
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* issuer_did
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* subject_did
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* vc_id
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and must include whatever other fields are relevant for the vc_template to be instantiated.
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The following field(s) will be auto-generated if not passed in `vc_data`:
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* issuance_date (to `datetime.datetime.now()`)
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"""
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async def inner():
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unsigned_vc = vc_template.render(vc_data)
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signed_vc = await didkit.issue_credential(
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unsigned_vc,
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'{"proofFormat": "ldp"}',
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jwk_issuer
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)
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return signed_vc
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if vc_data.get("issuance_date") is None:
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vc_data["issuance_date"] = datetime.datetime.now().replace(microsecond=0).isoformat()
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return asyncio.run(inner())
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def sign_credential(unsigned_vc: str, jwk_issuer):
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"""
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Signs the unsigned credential with the provided key.
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The credential template must be rendered with all user data.
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"""
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async def inner():
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signed_vc = await didkit.issue_credential(
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unsigned_vc,
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'{"proofFormat": "ldp"}',
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jwk_issuer
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)
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return signed_vc
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return asyncio.run(inner())
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def verify_credential(vc):
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"""
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Returns a (bool, str) tuple indicating whether the credential is valid.
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If the boolean is true, the credential is valid and the second argument can be ignored.
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If it is false, the VC is invalid and the second argument contains a JSON object with further information.
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"""
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async def inner():
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return await didkit.verify_credential(vc, '{"proofFormat": "ldp"}')
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return asyncio.run(inner())
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def issue_verifiable_presentation(vp_template: Template, vc_list: list[str], jwk_holder: str, holder_did: str) -> str:
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async def inner():
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unsigned_vp = vp_template.render(data)
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signed_vp = await didkit.issue_presentation(
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unsigned_vp,
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'{"proofFormat": "ldp"}',
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jwk_holder
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)
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return signed_vp
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data = {
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"holder_did": holder_did,
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"verifiable_credential_list": "[" + ",".join(vc_list) + "]"
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}
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return asyncio.run(inner())
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def create_verifiable_presentation(jwk_holder: str, unsigned_vp: str) -> str:
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async def inner():
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signed_vp = await didkit.issue_presentation(
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unsigned_vp,
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'{"proofFormat": "ldp"}',
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jwk_holder
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)
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return signed_vp
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return asyncio.run(inner())
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def verify_presentation(vp):
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"""
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Returns a (bool, str) tuple indicating whether the credential is valid.
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If the boolean is true, the credential is valid and the second argument can be ignored.
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If it is false, the VC is invalid and the second argument contains a JSON object with further information.
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"""
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async def inner():
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proof_options = '{"proofFormat": "ldp"}'
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return await didkit.verify_presentation(vp, proof_options)
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return asyncio.run(inner())
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