Skip to main content

fastapi-cloudauth supports simple integration between FastAPI and cloud authentication services (AWS Cognito, Auth0, Firebase Authentication).

Project description

FastAPI Cloud Auth

Tests codecov PyPI version

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, 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:

Requirements

Python 3.6+

Install

$ pip install fastapi-cloudauth

Example (AWS Cognito)

Pre-requirements

  • Check region, userPoolID and AppClientID of AWS Cognito that you manage to
  • Create a user's assigned read:users permission 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 main.py file with the following content:

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 :unlock: button can be available at the endpoint's injected dependency.

You can supply a token and try the endpoint interactively.

Swagger UI

Example (Auth0)

Pre-requirement

  • Check domain, customAPI (Audience) and ClientID of Auth0 that you manage to
  • Create a user assigned read:users permission 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 the 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 the following extra values (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": "janedoe@example.com",
  "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 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 don't require pydantic data serialization (validation), FastAPI-CloudAuth has an option to extract the 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 CONTRIBUTING for how to set up the development environment and testing.

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

fastapi-cloudauth-0.4.3.tar.gz (14.0 kB view hashes)

Uploaded source

Built Distribution

fastapi_cloudauth-0.4.3-py3-none-any.whl (14.9 kB view hashes)

Uploaded py3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page