248 lines
8.6 KiB
Python
248 lines
8.6 KiB
Python
"""FastAPI routes wrapping idpyoidc endpoint processing."""
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from __future__ import annotations
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import json
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from types import SimpleNamespace
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from urllib.parse import urlencode
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from fastapi import APIRouter, Request, Response
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from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse
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from idpyoidc.time_util import utc_time_sans_frac
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from fastapi_oidc_op.oidc.claims import PorchlightUserInfo, user_to_claims
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router = APIRouter(tags=["oidc"])
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@router.get("/.well-known/openid-configuration")
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async def provider_configuration(request: Request) -> JSONResponse:
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"""OIDC Discovery endpoint."""
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oidc_server = request.app.state.oidc_server
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endpoint = oidc_server.get_endpoint("provider_config")
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parsed = endpoint.parse_request({})
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result = endpoint.process_request(parsed)
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response_info = endpoint.do_response(response_args=result.get("response_args"), request=parsed)
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response_data = response_info["response"]
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if isinstance(response_data, str):
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response_data = json.loads(response_data)
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elif hasattr(response_data, "to_dict"):
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response_data = response_data.to_dict()
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return JSONResponse(content=response_data)
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@router.get("/jwks")
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async def jwks(request: Request) -> JSONResponse:
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"""Public signing keys (JWK Set)."""
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oidc_server = request.app.state.oidc_server
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keys = oidc_server.keyjar.export_jwks()
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return JSONResponse(content=keys)
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@router.get("/authorization")
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async def authorization(request: Request) -> Response:
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"""OIDC Authorization endpoint."""
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oidc_server = request.app.state.oidc_server
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endpoint = oidc_server.get_endpoint("authorization")
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query_params = dict(request.query_params)
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try:
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parsed = endpoint.parse_request(query_params)
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except Exception as exc:
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return HTMLResponse(f"<h1>Invalid Request</h1><p>{exc}</p>", status_code=400)
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if "error" in parsed:
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error_desc = parsed.get("error_description", parsed["error"])
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return HTMLResponse(f"<h1>Error</h1><p>{error_desc}</p>", status_code=400)
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# Check if user is authenticated
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userid = request.session.get("userid")
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username = request.session.get("username")
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if userid and username:
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return await _complete_authorization(request, oidc_server, endpoint, parsed, userid, username)
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# Not authenticated — store and redirect to login
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request.session["oidc_auth_request"] = query_params
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return RedirectResponse("/login", status_code=303)
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@router.get("/authorization/complete")
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async def authorization_complete(request: Request) -> Response:
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"""Resume OIDC authorization after login."""
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oidc_server = request.app.state.oidc_server
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endpoint = oidc_server.get_endpoint("authorization")
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auth_request_params = request.session.pop("oidc_auth_request", None)
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if auth_request_params is None:
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return HTMLResponse("<h1>Error</h1><p>No pending authorization request</p>", status_code=400)
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userid = request.session.get("userid")
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username = request.session.get("username")
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if not userid or not username:
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return RedirectResponse("/login", status_code=303)
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try:
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parsed = endpoint.parse_request(auth_request_params)
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except Exception as exc:
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return HTMLResponse(f"<h1>Error</h1><p>{exc}</p>", status_code=400)
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if "error" in parsed:
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error_desc = parsed.get("error_description", parsed["error"])
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return HTMLResponse(f"<h1>Error</h1><p>{error_desc}</p>", status_code=400)
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return await _complete_authorization(request, oidc_server, endpoint, parsed, userid, username)
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async def _complete_authorization(
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request: Request,
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oidc_server: object,
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endpoint: object,
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parsed: object,
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userid: str,
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username: str,
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) -> Response:
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"""Complete OIDC authorization after user authentication."""
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# Populate userinfo cache
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user_repo = request.app.state.user_repo
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user = await user_repo.get_by_userid(userid)
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if user is None:
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return HTMLResponse("<h1>Error</h1><p>User not found</p>", status_code=400)
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userinfo: PorchlightUserInfo = oidc_server.context.userinfo # type: ignore[union-attr]
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claims = user_to_claims(user)
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userinfo.set_user_claims(username, claims)
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# Create idpyoidc session — authn_method needs a kwargs dict
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authn_method = SimpleNamespace(kwargs={})
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session_id = endpoint.create_session( # type: ignore[union-attr]
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request=parsed,
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user_id=username,
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acr="urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport",
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time_stamp=utc_time_sans_frac(),
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authn_method=authn_method,
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)
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# Complete authorization (mints code, builds redirect)
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result = endpoint.authz_part2(request=parsed, session_id=session_id) # type: ignore[union-attr]
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if "error" in result.get("response_args", {}):
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response_args = result["response_args"]
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error_desc = response_args.get("error_description", response_args["error"])
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return HTMLResponse(f"<h1>Error</h1><p>{error_desc}</p>", status_code=400)
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# Build redirect URL
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response_args = result.get("response_args", {})
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return_uri = result.get("return_uri", "")
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if hasattr(response_args, "to_dict"):
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params = response_args.to_dict()
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elif isinstance(response_args, dict):
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params = response_args
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else:
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params = dict(response_args)
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redirect_url = f"{return_uri}?{urlencode(params)}"
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return RedirectResponse(redirect_url, status_code=303)
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@router.post("/token")
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async def token_endpoint(request: Request) -> JSONResponse:
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"""OIDC Token endpoint."""
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oidc_server = request.app.state.oidc_server
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endpoint = oidc_server.get_endpoint("token")
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body = await request.body()
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body_str = body.decode("utf-8")
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http_info = {
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"headers": dict(request.headers),
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"url": str(request.url),
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}
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try:
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parsed = endpoint.parse_request(body_str, http_info=http_info)
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except Exception as exc:
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return JSONResponse({"error": "invalid_request", "error_description": str(exc)}, status_code=400)
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if isinstance(parsed, dict) and "error" in parsed:
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return JSONResponse(parsed, status_code=400)
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elif hasattr(parsed, "to_dict") and "error" in parsed:
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return JSONResponse(parsed.to_dict(), status_code=400)
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result = endpoint.process_request(parsed)
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if hasattr(result, "to_dict") and "error" in result:
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return JSONResponse(result.to_dict(), status_code=400)
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elif isinstance(result, dict) and "error" in result:
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return JSONResponse(result, status_code=400)
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resp_info = endpoint.do_response(response_args=result.get("response_args"), request=parsed)
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response_data = resp_info["response"]
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if isinstance(response_data, str):
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response_data = json.loads(response_data)
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elif hasattr(response_data, "to_dict"):
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response_data = response_data.to_dict()
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return JSONResponse(response_data)
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@router.api_route("/userinfo", methods=["GET", "POST"])
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async def userinfo_endpoint(request: Request) -> JSONResponse:
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"""OIDC UserInfo endpoint."""
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oidc_server = request.app.state.oidc_server
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endpoint = oidc_server.get_endpoint("userinfo")
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http_info = {
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"headers": dict(request.headers),
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"url": str(request.url),
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}
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if request.method == "POST":
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body = await request.body()
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request_data = body.decode("utf-8")
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else:
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request_data = {}
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try:
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parsed = endpoint.parse_request(request_data, http_info=http_info)
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except Exception as exc:
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return JSONResponse(
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{"error": "invalid_token", "error_description": str(exc)},
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status_code=401,
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)
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if isinstance(parsed, dict) and "error" in parsed:
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error_data = parsed
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elif hasattr(parsed, "to_dict") and "error" in parsed:
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error_data = parsed.to_dict()
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else:
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error_data = None
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if error_data is not None:
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return JSONResponse(error_data, status_code=401)
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result = endpoint.process_request(parsed)
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if hasattr(result, "to_dict") and "error" in result:
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return JSONResponse(result.to_dict(), status_code=401)
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elif isinstance(result, dict) and "error" in result:
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return JSONResponse(result, status_code=401)
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resp_info = endpoint.do_response(
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response_args=result.get("response_args"),
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request=parsed,
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client_id=result.get("client_id", ""),
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)
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response_data = resp_info["response"]
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if isinstance(response_data, str):
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response_data = json.loads(response_data)
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elif hasattr(response_data, "to_dict"):
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response_data = response_data.to_dict()
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return JSONResponse(response_data)
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