kopia lustrzana https://github.com/jointakahe/takahe
244 wiersze
8.3 KiB
Python
244 wiersze
8.3 KiB
Python
import base64
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import secrets
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from urllib.parse import urlparse, urlunparse
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from django.contrib.auth.mixins import LoginRequiredMixin
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from django.http import (
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HttpResponse,
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HttpResponseForbidden,
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HttpResponseRedirect,
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JsonResponse,
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)
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from django.shortcuts import render
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from django.utils import timezone
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from django.utils.decorators import method_decorator
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from django.views.decorators.csrf import csrf_exempt
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from django.views.generic import View
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from api.models import Application, Authorization, Token
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from api.parser import FormOrJsonParser
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class OauthRedirect(HttpResponseRedirect):
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def __init__(self, redirect_uri, **kwargs):
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url_parts = urlparse(redirect_uri)
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self.allowed_schemes = [url_parts.scheme]
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# Either add or join the query section
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url_parts = list(url_parts)
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query_string = url_parts[4]
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for key, value in kwargs.items():
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if value is None:
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continue
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if not query_string:
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query_string = f"{key}={value}"
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else:
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query_string += f"&{key}={value}"
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url_parts[4] = query_string
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super().__init__(urlunparse(url_parts))
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class AuthorizationView(LoginRequiredMixin, View):
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"""
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Asks the user to authorize access.
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Could maybe be a FormView, but things are weird enough we just handle the
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POST manually.
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"""
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def get(self, request):
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redirect_uri = self.request.GET["redirect_uri"]
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scope = self.request.GET.get("scope", "read")
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state = self.request.GET.get("state")
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response_type = self.request.GET.get("response_type")
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if response_type != "code":
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return render(
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request,
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"api/oauth_error.html",
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{"error": f"Invalid response type '{response_type}'"},
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)
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application = Application.objects.filter(
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client_id=self.request.GET.get("client_id"),
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).first()
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if application is None:
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return render(
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request, "api/oauth_error.html", {"error": "Invalid client_id"}
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)
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if application.redirect_uris and redirect_uri not in application.redirect_uris:
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return render(
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request,
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"api/oauth_error.html",
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{"error": "Invalid application redirect URI"},
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)
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context = {
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"application": application,
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"state": state,
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"redirect_uri": redirect_uri,
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"scope": scope,
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"identities": self.request.user.identities.all(),
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}
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return render(request, "api/oauth_authorize.html", context)
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def post(self, request):
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post_data = FormOrJsonParser().parse_body(request)
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# Grab the application and other details again
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redirect_uri = post_data["redirect_uri"]
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scope = post_data["scope"]
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application = Application.objects.get(client_id=post_data["client_id"])
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# Get the identity
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identity = self.request.user.identities.get(pk=post_data["identity"])
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extra_args = {}
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if post_data.get("state"):
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extra_args["state"] = post_data["state"]
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# Make a token
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token = Authorization.objects.create(
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application=application,
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user=self.request.user,
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identity=identity,
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code=secrets.token_urlsafe(43),
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redirect_uri=redirect_uri,
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scopes=scope.split(),
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)
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# If it's an out of band request, show the code
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if redirect_uri == "urn:ietf:wg:oauth:2.0:oob":
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return render(request, "api/oauth_code.html", {"code": token.code})
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# Redirect with the token's code
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return OauthRedirect(redirect_uri, code=token.code, **extra_args)
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def extract_client_info_from_basic_auth(request):
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if "authorization" in request.headers:
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auth = request.headers["authorization"].split()
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if len(auth) == 2:
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if auth[0].lower() == "basic":
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client_id, client_secret = (
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base64.b64decode(auth[1]).decode("utf8").split(":", 1)
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)
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return client_id, client_secret
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return None, None
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@method_decorator(csrf_exempt, name="dispatch")
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class TokenView(View):
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def verify_code(
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self, authorization: Authorization, client_id, client_secret, redirect_uri
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):
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application = authorization.application
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return (
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application.client_id == client_id
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and application.client_secret == client_secret
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and authorization.redirect_uri == redirect_uri
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)
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def post(self, request):
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post_data = FormOrJsonParser().parse_body(request)
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auth_client_id, auth_client_secret = extract_client_info_from_basic_auth(
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request
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)
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post_data.setdefault("client_id", auth_client_id)
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post_data.setdefault("client_secret", auth_client_secret)
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grant_type = post_data.get("grant_type")
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if grant_type not in (
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"authorization_code",
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"client_credentials",
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):
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return JsonResponse({"error": "invalid_grant_type"}, status=400)
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if grant_type == "client_credentials":
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# TODO: Implement client credentials flow
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return JsonResponse(
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{
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"error": "invalid_grant_type",
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"error_description": "client credential flow not implemented",
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},
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status=400,
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)
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elif grant_type == "authorization_code":
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code = post_data.get("code")
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if not code:
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return JsonResponse(
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{
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"error": "invalid_request",
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"error_description": "Required param : code",
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},
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status=400,
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)
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authorization = Authorization.objects.get(code=code)
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if (
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not authorization
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or timezone.now() - authorization.created
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> timezone.timedelta(seconds=authorization.valid_for_seconds)
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):
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return JsonResponse({"error": "access_denied"}, status=401)
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application = Application.objects.filter(
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client_id=post_data["client_id"],
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client_secret=post_data["client_secret"],
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).first()
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code_verified = self.verify_code(
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authorization,
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client_id=post_data.get("client_id"),
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client_secret=post_data.get("client_secret"),
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redirect_uri=post_data.get("redirect_uri"),
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)
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if not application or authorization.token or not code_verified:
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# this authorization code has already been used
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return JsonResponse({"error": "access_denied"}, status=401)
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token = Token.objects.create(
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application=application,
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user=authorization.user,
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identity=authorization.identity,
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token=secrets.token_urlsafe(43),
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scopes=authorization.scopes,
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)
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token.save()
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# Return them the token
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return JsonResponse(
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{
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"access_token": token.token,
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"token_type": "Bearer",
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"scope": " ".join(token.scopes),
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"created_at": int(token.created.timestamp()),
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}
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)
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@method_decorator(csrf_exempt, name="dispatch")
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class RevokeTokenView(View):
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def post(self, request):
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post_data = FormOrJsonParser().parse_body(request)
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auth_client_id, auth_client_secret = extract_client_info_from_basic_auth(
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request
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)
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post_data.setdefault("client_id", auth_client_id)
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post_data.setdefault("client_secret", auth_client_secret)
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token_str = post_data["token"]
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application = Application.objects.filter(
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client_id=post_data["client_id"],
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client_secret=post_data["client_secret"],
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).first()
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token = Token.objects.filter(application=application, token=token_str).first()
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if token is None:
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return HttpResponseForbidden()
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token.revoked = timezone.now()
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token.save()
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return HttpResponse("")
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