124 lines
3.8 KiB
Python
124 lines
3.8 KiB
Python
import asyncio
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import datetime
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from typing import Any
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import didkit
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import json
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import jinja2
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from jinja2 import Environment, FileSystemLoader, select_autoescape
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from ast import literal_eval
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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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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(unsigned_vc: dict, jwk_issuer):
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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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signed_vc = await didkit.issue_credential(
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json.dumps(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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"""
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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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Checks performed:
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* The credential is valid in signature and form, and
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* The credential validates itself against its declared schema.
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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 string (which is a valid JSON object) with further information.
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"""
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async def inner():
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str_res = await didkit.verify_credential(vc, '{"proofFormat": "ldp"}')
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res = literal_eval(str_res)
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ok = res["warnings"] == [] and res["errors"] == []
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return ok, str_res
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(ok, res) = asyncio.run(inner())
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if not ok:
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# The credential doesn't pass signature checks, so early return
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return ok, res
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return ok, res
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def issue_verifiable_presentation(vc_list: list[str], jwk_holder: str, holder_did: str) -> str:
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async def inner():
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unsigned_vp = unsigned_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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env = Environment(
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loader=FileSystemLoader("vc_templates"),
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autoescape=select_autoescape()
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)
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unsigned_vp_template = env.get_template("verifiable_presentation.json")
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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 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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