FastAPI Cloud Auth
fastapi-cloudauth standardizes and simplifies the integration between FastAPI and cloud authentication services (AWS Cognito, Auth0, Firebase Authentication).
Features
- Verify access/id token: standard JWT validation (signature, expiration), token audience claims and etc.
- Verify permissions based on scope (or groups) within access token and Extract user info
- Get the detail of login user info (name, email, etc.) within ID token
- Dependency injection for verification/getting user, powered by FastAPI
- Support for:
- AWS Cognito
- Auth0
- Firebase Auth (Only ID token)
Requirements
Python 3.6+
Install
$ pip install fastapi-cloudauth
Example (AWS Cognito)
Pre-requirement
- Check
region,userPoolIDandAppClientIDof AWS Cognito that you manage to - Create a user assigned
read:userspermission in AWS Cognito - Get Access/ID token for the created user
NOTE: access token is valid for verification, scope-based authentication and getting user info (optional). ID token is valid for verification and getting full user info from claims.
Create it
Create a file main.py with:
import os
from pydantic import BaseModel
from fastapi import FastAPI, Depends
from fastapi_cloudauth.cognito import Cognito, CognitoCurrentUser, CognitoClaims
app = FastAPI()
auth = Cognito(
region=os.environ["REGION"],
userPoolId=os.environ["USERPOOLID"],
client_id=os.environ["APPCLIENTID"]
)
@app.get("/", dependencies=[Depends(auth.scope(["read:users"]))])
def secure():
# access token is valid
return "Hello"
class AccessUser(BaseModel):
sub: str
@app.get("/access/")
def secure_access(current_user: AccessUser = Depends(auth.claim(AccessUser))):
# access token is valid and getting user info from access token
return f"Hello", {current_user.sub}
get_current_user = CognitoCurrentUser(
region=os.environ["REGION"],
userPoolId=os.environ["USERPOOLID"],
client_id=os.environ["APPCLIENTID"]
)
@app.get("/user/")
def secure_user(current_user: CognitoClaims = Depends(get_current_user)):
# ID token is valid and getting user info from ID token
return f"Hello, {current_user.username}"
Run the server with:
$ uvicorn main:app
INFO: Started server process [15332]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
Interactive API Doc
Go to http://127.0.0.1:8000/docs.
You will see the automatic interactive API documentation (provided by Swagger UI).
Authorize
You can supply a token and try the endpoint interactively.
Example (Auth0)
Pre-requirement
- Check
domain,customAPI(Audience) andClientIDof Auth0 that you manage to - Create a user assigned
read:userspermission in Auth0 - Get Access/ID token for the created user
Create it
Create a file main.py with:
import os
from pydantic import BaseModel
from fastapi import FastAPI, Depends
from fastapi_cloudauth.auth0 import Auth0, Auth0CurrentUser, Auth0Claims
app = FastAPI()
auth = Auth0(domain=os.environ["DOMAIN"], customAPI=os.environ["CUSTOMAPI"])
@app.get("/", dependencies=[Depends(auth.scope(["read:users"]))])
def secure():
# access token is valid
return "Hello"
class AccessUser(BaseModel):
sub: str
@app.get("/access/")
def secure_access(current_user: AccessUser = Depends(auth.claim(AccessUser))):
# access token is valid and getting user info from access token
return f"Hello", {current_user.sub}
get_current_user = Auth0CurrentUser(
domain=os.environ["DOMAIN"],
client_id=os.environ["CLIENTID"]
)
@app.get("/user/")
def secure_user(current_user: Auth0Claims = Depends(get_current_user)):
# ID token is valid and getting user info from ID token
return f"Hello, {current_user.username}"
Try to run the server and see interactive UI in the same way.
Example (Firebase Authentication)
Pre-requirement
- Create a user in Firebase Authentication and get
project ID - Get ID token for the created user
Create it
Create a file main.py with:
from fastapi import FastAPI, Depends
from fastapi_cloudauth.firebase import FirebaseCurrentUser, FirebaseClaims
app = FastAPI()
get_current_user = FirebaseCurrentUser(
project_id=os.environ["PROJECT_ID"]
)
@app.get("/user/")
def secure_user(current_user: FirebaseClaims = Depends(get_current_user)):
# ID token is valid and getting user info from ID token
return f"Hello, {current_user.user_id}"
Try to run the server and see interactive UI in the same way.
Additional User Information
We can get values for the current user from access/ID token by writing a few lines.
Custom Claims
For Auth0, the ID token contains extra values as follows (Ref at Auth0 official doc):
{
"iss": "http://YOUR_DOMAIN/",
"sub": "auth0|123456",
"aud": "YOUR_CLIENT_ID",
"exp": 1311281970,
"iat": 1311280970,
"name": "Jane Doe",
"given_name": "Jane",
"family_name": "Doe",
"gender": "female",
"birthdate": "0000-10-31",
"email": "[email protected]",
"picture": "http://example.com/janedoe/me.jpg"
}
By default, Auth0CurrentUser gives pydantic.BaseModel object, which has username (name) and email fields.
Here is sample code for extracting extra user information (adding user_id) from ID token:
from pydantic import Field
from fastapi_cloudauth.auth0 import Auth0Claims # base current user info model (inheriting `pydantic`).
# extend current user info model by `pydantic`.
class CustomAuth0Claims(Auth0Claims):
user_id: str = Field(alias="sub")
get_current_user = Auth0CurrentUser(domain=DOMAIN, client_id=CLIENTID)
get_current_user.user_info = CustomAuth0Claims # override user info model with a custom one.
Or, we can also set new custom claims as follows:
get_user_detail = get_current_user.claim(CustomAuth0Claims)
@app.get("/new/")
async def detail(user: CustomAuth0Claims = Depends(get_user_detail)):
return f"Hello, {user.user_id}"
Raw payload
If you doesn't require pydantic data serialization (validation), FastAPI-CloudAuth has a option to extract raw payload.
All you need is:
get_raw_info = get_current_user.claim(None)
@app.get("/new/")
async def raw_detail(user = Depends(get_raw_info)):
# user has all items (ex. iss, sub, aud, exp, ... it depends on passed token)
return f"Hello, {user.get('sub')}"
Additional scopes
Advanced user-SCOPE verification to protect your API.
Supports:
- all (default): required all scopes you set
- any: At least one of the configured scopes is required
Use as (auth is this instanse and app is fastapi.FastAPI instanse):
from fastapi import Depends
from fastapi_cloudauth import Operator
@app.get("/", dependencies=[Depends(auth.scope(["allowned", "scopes"]))])
def api_all_scope():
return "user has 'allowned' and 'scopes' scopes"
@app.get("/", dependencies=[Depends(auth.scope(["allowned", "scopes"], op=Operator._any))])
def api_any_scope():
return "user has at least one of scopes (allowned, scopes)"
Development - Contributing
Please read the CONTRIBUTING how to setup development environment and testing.
![[Auth0] user_id from current user](https://avatars.githubusercontent.com/u/4096709?v=4)
![[Cognito] App client_id is not validated for Cognito JWT (access_token)](https://avatars.githubusercontent.com/u/12431595?v=4)
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