131 lines
3.7 KiB
Python
131 lines
3.7 KiB
Python
"""Community Keycloak SSO user management."""
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import json
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from os import environ
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from uuid import uuid4
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import httpx
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from aioredis import create_redis_pool
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from authlib.integrations.starlette_client import OAuth, OAuthError
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from fastapi import Depends, FastAPI, HTTPException, Request
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from fastapi.responses import HTMLResponse, RedirectResponse
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from fastapi.templating import Jinja2Templates
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from starlette.exceptions import HTTPException
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from starlette.middleware.sessions import SessionMiddleware
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APP_SECRET_KEY = environ.get("APP_SECRET_KEY")
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KEYCLOAK_CLIENT_ID = environ.get("KEYCLOAK_CLIENT_ID")
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KEYCLOAK_CLIENT_SECRET = environ.get("KEYCLOAK_CLIENT_SECRET")
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KEYCLOAK_DOMAIN = environ.get("KEYCLOAK_DOMAIN")
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KEYCLOAK_REALM = environ.get("KEYCLOAK_REALM")
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BASE_URL = f"https://{KEYCLOAK_DOMAIN}/auth/realms/{KEYCLOAK_REALM}/protocol/openid-connect" # noqa
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REDIS_DB = environ.get("REDIS_DB")
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REDIS_HOST = environ.get("REDIS_HOST")
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REDIS_PORT = environ.get("REDIS_PORT")
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app = FastAPI(docs_url=None, redoc_url=None)
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app.add_middleware(SessionMiddleware, secret_key=APP_SECRET_KEY)
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templates = Jinja2Templates(directory="templates")
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oauth = OAuth()
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oauth.register(
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name="keycloak",
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client_kwargs={"scope": "openid profile email"},
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client_id=KEYCLOAK_CLIENT_ID,
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client_secret=KEYCLOAK_CLIENT_SECRET,
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authorize_url=f"{BASE_URL}/auth",
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access_token_url=f"{BASE_URL}/token",
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jwks_uri=f"{BASE_URL}/certs",
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)
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class RequiresLoginException(Exception):
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pass
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@app.exception_handler(RequiresLoginException)
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async def requires_login(request, exception):
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return RedirectResponse(request.url_for("login"))
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@app.exception_handler(HTTPException)
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async def http_exception_handler(request, exc):
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home = request.url_for("login")
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return HTMLResponse(f"<p>{exc.detail} (<a href='{home}'>home</a>)</p>")
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async def logged_in(request: Request):
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user = request.session.get("user")
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if not user:
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raise RequiresLoginException
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return user
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async def get_user(request: Request):
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return request.session.get("user")
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@app.on_event("startup")
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async def starup_event():
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app.state.redis = create_redis_pool(
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f"redis://{REDIS_HOST}:{REDIS_PORT}/{REDIS_DB}?encoding=utf-8"
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)
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@app.on_event("shutdown")
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async def shutdown_event():
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app.state.redis.close()
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await app.state.redis.wait_closed()
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@app.get("/", dependencies=[Depends(logged_in)])
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async def home(request: Request, user=Depends(get_user)):
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context = {"request": request, "user": user}
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return templates.TemplateResponse("admin.html", context=context)
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@app.get("/login")
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async def login(request: Request):
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return templates.TemplateResponse(
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"login.html", context={"request": request}
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)
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@app.get("/login/keycloak")
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async def login_keycloak(request: Request):
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redirect_uri = request.url_for("auth_keycloak")
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return await oauth.keycloak.authorize_redirect(request, redirect_uri)
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@app.get("/auth/keycloak")
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async def auth_keycloak(request: Request):
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try:
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token = await oauth.keycloak.authorize_access_token(request)
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except Exception as exc:
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return HTMLResponse(f"<p>{exc} (<a href='{home}'>home</a>)</p>")
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user = await oauth.keycloak.parse_id_token(request, token)
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request.session["user"] = dict(user)
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return RedirectResponse(request.url_for("home"))
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@app.get("/logout", dependencies=[Depends(logged_in)])
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async def logout(request: Request):
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try:
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httpx.get(f"{BASE_URL}/logout")
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except Exception as exc:
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return HTMLResponse(f"<p>{exc} (<a href='{home}'>home</a>)</p>")
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request.session.pop("user", None)
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return RedirectResponse(request.url_for("login"))
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@app.get("/invite/keycloak", dependencies=[Depends(logged_in)])
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async def invite_keycloak(request: Request):
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pass
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