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remove idhub_ssikit

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Cayo Puigdefabregas 2024-06-06 17:40:08 +02:00
parent 19ff253083
commit 95e2669b18
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73
utils/idhub_ssikit/README.md
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# Helper routines to manage DIDs/VC/VPs
This module is a wrapper around the functions exported by SpruceID's `DIDKit` framework.
## DID generation and storage
For now DIDs are of the kind `did:key`, with planned support for `did:web` in the near future.
Creation of a DID involves two steps:
* Generate a unique DID controller key
* Derive a `did:key` type from the key
Both must be stored in the IdHub database and linked to a `User` for later retrieval.
```python
# Use case: generate and link a new DID for an existing user
user = request.user # ...
controller_key = idhub_ssikit.generate_did_controller_key()
did_string = idhub_ssikit.keydid_from_controller_key(controller_key)
did = idhub.models.DID(
did = did_string,
user = user
)
did_controller_key = idhub.models.DIDControllerKey(
key_material = controller_key,
owner_did = did
)
did.save()
did_controller_key.save()
```
## Verifiable Credential issuance
Verifiable Credential templates are stored as Jinja2 (TBD) templates in `/schemas` folder. Please examine each template to see what data must be passed to it in order to render.
The data passed to the template must at a minimum include:
* issuer_did
* subject_did
* vc_id
For example, in order to render `/schemas/member-credential.json`:
```python
from jinja2 import Environment, FileSystemLoader, select_autoescape
import idhub_ssikit
env = Environment(
loader=FileSystemLoader("vc_templates"),
autoescape=select_autoescape()
)
unsigned_vc_template = env.get_template("member-credential.json")
issuer_user = request.user
issuer_did = user.dids[0] # TODO: Django ORM pseudocode
issuer_did_controller_key = did.keys[0] # TODO: Django ORM pseudocode
data = {
"vc_id": "http://pangea.org/credentials/3731",
"issuer_did": issuer_did,
"subject_did": "did:web:[...]",
"issuance_date": "2020-08-19T21:41:50Z",
"subject_is_member_of": "Pangea"
}
signed_credential = idhub_ssikit.render_and_sign_credential(
unsigned_vc_template,
issuer_did_controller_key,
data
)
```

15
utils/idhub_ssikit/TENANT_CFG_TEMPLATE
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{
"issuerApiUrl": "http://localhost:8080/issuer-api/default",
"issuerClientName": "PANGEA Issuer Portal",
"issuerDid": null,
"issuerUiUrl": "http://localhost:5000",
"wallets": {
"walt.id": {
"description": "walt.id web wallet",
"id": "walt.id",
"presentPath": "api/siop/initiatePresentation",
"receivePath": "api/siop/initiateIssuance",
"url": "http://localhost:3000"
}
}
}

184
utils/idhub_ssikit/__init__.py
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import asyncio
import base64
import datetime
import zlib
from ast import literal_eval
import didkit
import json
import urllib
import jinja2
from django.template.backends.django import Template
from django.template.loader import get_template
from pyroaring import BitMap
from trustchain_idhub import settings
def generate_did_controller_key():
return didkit.generate_ed25519_key()
def keydid_from_controller_key(key):
return didkit.key_to_did("key", key)
def resolve_did(keydid):
async def inner():
return await didkit.resolve_did(keydid, "{}")
return asyncio.run(inner())
def webdid_from_controller_key(key, domain):
"""
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(resolve_did(keydid)) # Documento DID en terminos "key"
# domain = urllib.parse.urlencode({"domain": settings.DOMAIN})[7:]
webdid_url = f"did:web:{domain}:did-registry:{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 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 unsigned credential with the provided key.
The credential template must be rendered with all user data.
"""
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.
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():
str_res = await didkit.verify_credential(vc, '{"proofFormat": "ldp"}')
res = literal_eval(str_res)
ok = res["warnings"] == [] and res["errors"] == []
return ok, str_res
valid, reason = asyncio.run(inner())
if not valid:
return valid, reason
# Credential passes basic signature verification. Now check it against its schema.
# TODO: check agasint schema
# pass
# Credential verifies against its schema. Now check revocation status.
vc = json.loads(vc)
if "credentialStatus" in vc:
revocation_index = int(vc["credentialStatus"]["revocationBitmapIndex"]) # NOTE: THIS FIELD SHOULD BE SERIALIZED AS AN INTEGER, BUT IOTA DOCUMENTAITON SERIALIZES IT AS A STRING. DEFENSIVE CAST ADDED JUST IN CASE.
vc_issuer = vc["issuer"]["id"] # This is a DID
if vc_issuer[:7] == "did:web": # Only DID:WEB can revoke
issuer_did_document = json.loads(resolve_did(vc_issuer)) # TODO: implement a caching layer so we don't have to fetch the DID (and thus the revocation list) every time a VC is validated.
issuer_revocation_list = issuer_did_document["service"][0]
assert issuer_revocation_list["type"] == "RevocationBitmap2022"
revocation_bitmap = BitMap.deserialize(
zlib.decompress(
base64.b64decode(
issuer_revocation_list["serviceEndpoint"].rsplit(",")[1].encode('utf-8')
)
)
)
if revocation_index in revocation_bitmap:
return False, "Credential has been revoked by the issuer"
# Fallthrough means all is good.
return True, "Credential passes all checks"
def issue_verifiable_presentation(vp_template: Template, vc_list: list[str], jwk_holder: str, holder_did: str) -> str:
async def inner():
unsigned_vp = vp_template.render(data)
signed_vp = await didkit.issue_presentation(
unsigned_vp,
'{"proofFormat": "ldp"}',
jwk_holder
)
return signed_vp
data = {
"holder_did": holder_did,
"verifiable_credential_list": "[" + ",".join(vc_list) + "]"
}
return asyncio.run(inner())
def create_verifiable_presentation(jwk_holder: str, unsigned_vp: str) -> str:
async def inner():
signed_vp = await didkit.issue_presentation(
unsigned_vp,
'{"proofFormat": "ldp"}',
jwk_holder
)
return signed_vp
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())