IdHub/oidc4vp/models.py

221 lines
6.3 KiB
Python

import requests
import secrets
from django.conf import settings
from django.http import QueryDict
from django.utils.translation import gettext_lazy as _
from django.shortcuts import get_object_or_404
from idhub_auth.models import User
from django.db import models
from utils.idhub_ssikit import verify_presentation
SALT_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
def gen_salt(length: int) -> str:
"""Generate a random string of SALT_CHARS with specified ``length``."""
if length <= 0:
raise ValueError("Salt length must be positive")
return "".join(secrets.choice(SALT_CHARS) for _ in range(length))
def set_client_id():
return gen_salt(24)
def set_client_secret():
return gen_salt(48)
def set_code():
return gen_salt(24)
class Organization(models.Model):
"""
This class represent a member of one net trust or federated host.
Client_id and client_secret are the credentials of this organization
get a connection to my. (receive a request)
My_client_id and my_client_secret are my credentials than to use if I
want to connect to this organization. (send a request)
For use the packages requests we need use my_client_id
For use in the get or post method of a View, then we need use client_id
and secret_id
"""
name = models.CharField(max_length=250)
client_id = models.CharField(
max_length=24,
default=set_client_id,
unique=True
)
client_secret = models.CharField(
max_length=48,
default=set_client_secret
)
my_client_id = models.CharField(
max_length=24,
)
my_client_secret = models.CharField(
max_length=48,
)
response_uri = models.URLField(
help_text=_("Url where to send the verificable presentation"),
max_length=250
)
def send(self, vp, code):
"""
Send the verificable presentation to Verifier
"""
url = "{url}/verify".format(
url=self.response_uri.strip("/"),
)
auth = (self.my_client_id, self.my_client_secret)
data = {"vp_token": vp}
if code:
data["code"] = code
return requests.post(url, data=data, auth=auth)
def demand_authorization(self):
"""
Send the a request for start a process of Verifier
"""
url = "{url}/verify?demand_uri={redirect_uri}".format(
url=self.response_uri.strip("/"),
redirect_uri=settings.RESPONSE_URI
)
auth = (self.my_client_id, self.my_client_secret)
return requests.get(url, auth=auth)
def __str__(self):
return self.name
###################
# Verifier clases #
###################
class Authorization(models.Model):
"""
This class represent a query through browser the client to the wallet.
The Verifier need to do a redirection to the user to Wallet.
The code we use as a soft foreing key between Authorization and OAuth2VPToken.
"""
code = models.CharField(max_length=24, default=set_code)
code_used = models.BooleanField()
created = models.DateTimeField(auto_now=True)
presentation_definition = models.CharField(max_length=250)
organization = models.ForeignKey(
Organization,
on_delete=models.CASCADE,
related_name='authorizations',
null=True,
)
user = models.ForeignKey(
User,
on_delete=models.CASCADE,
null=True,
)
def authorize(self, path=None):
data = {
"response_type": "vp_token",
"response_mode": "direct_post",
"client_id": self.organization.my_client_id,
"presentation_definition": self.presentation_definition,
"code": self.code,
"nonce": gen_salt(5),
}
query_dict = QueryDict('', mutable=True)
query_dict.update(data)
response_uri = self.organization.response_uri.strip("/")
if path:
response_uri = "{}/{}".format(response_uri, path.strip("/"))
url = '{response_uri}/authorize?{params}'.format(
response_uri=response_uri,
params=query_dict.urlencode()
)
return url
class OAuth2VPToken(models.Model):
"""
This class represent the response of Wallet to Verifier
and the result of verify.
"""
created = models.DateTimeField(auto_now=True)
result_verify = models.CharField(max_length=255)
vp_token = models.TextField()
organization = models.ForeignKey(
Organization,
on_delete=models.CASCADE,
related_name='vp_tokens',
null=True,
)
user = models.ForeignKey(
User,
on_delete=models.CASCADE,
related_name='vp_tokens',
null=True,
)
authorization = models.ForeignKey(
Authorization,
on_delete=models.SET_NULL,
related_name='oauth2vptoken',
null=True,
)
def __init__(self, *args, **kwargs):
code = kwargs.pop("code", None)
super().__init__(*args, **kwargs)
self.authorization = get_object_or_404(
Authorization,
code=code
)
def verifing(self):
self.result_verify = verify_presentation(self.vp_token)
def get_response_verify(self):
response = {
"verify": ',',
"redirect_uri": "",
"response": "",
}
verification = json.loads(self.result_verify)
if verification.get('errors') or verification.get('warnings'):
response["verify"] = "Error, Verification Failed"
return response
response["verify"] = "Ok, Verification correct"
response["redirect_uri"] = self.get_redirect_url()
return response
def get_redirect_url(self):
data = {
"code": self.authorization.code,
}
query_dict = QueryDict('', mutable=True)
query_dict.update(data)
response_uri = settings.ALLOW_CODE_URI
url = '{response_uri}?{params}'.format(
response_uri=response_uri,
params=query_dict.urlencode()
)
return url
def get_user_info(self):
tk = json.loads(self.vp_token)
self.user_info = tk.get(
"verifiableCredential", [{}]
)[-1].get("credentialSubject")