# FastAPI SSO
FastAPI plugin to enable SSO to most common providers (such as Facebook login, Google login and login via Microsoft Office 365 account).
This allows you to implement the famous `Login with Google/Facebook/Microsoft` buttons functionality on your backend very easily.
## Support this project
If you'd like to support this project, consider [buying me a coffee ☕](https://www.buymeacoffee.com/tomas.votava).
I tend to process Pull Requests faster when properly caffeinated 😉.
<a href="https://www.buymeacoffee.com/tomas.votava" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" style="height: 60px !important;width: 217px !important;" ></a>
## Supported login providers
### Official
- Google
- Microsoft
- Facebook
- Spotify
- Fitbit
- Github (credits to [Brandl](https://github.com/Brandl) for hint using `accept` header)
- generic (see [docs](https://tomasvotava.github.io/fastapi-sso/sso/generic.html))
### Contributed
- Kakao (by Jae-Baek Song - [thdwoqor](https://github.com/thdwoqor))
See [Contributing](#contributing) for a guide on how to contribute your own login provider.
## Installation
### Install using `pip`
```console
pip install fastapi-sso
```
### Install using `poetry`
```console
poetry add fastapi-sso
```
## Example
For more examples, see [`examples`](/examples/) directory.
### `example.py`
```python
"""This is an example usage of fastapi-sso.
"""
from fastapi import FastAPI
from starlette.requests import Request
from fastapi_sso.sso.google import GoogleSSO
app = FastAPI()
google_sso = GoogleSSO("my-client-id", "my-client-secret", "https://my.awesome-web.com/google/callback")
@app.get("/google/login")
async def google_login():
"""Generate login url and redirect"""
return await google_sso.get_login_redirect()
@app.get("/google/callback")
async def google_callback(request: Request):
"""Process login response from Google and return user info"""
user = await google_sso.verify_and_process(request)
return {
"id": user.id,
"picture": user.picture,
"display_name": user.display_name,
"email": user.email,
"provider": user.provider,
}
```
Run using `uvicorn example:app`.
### Specify `redirect_uri` on request time
In scenarios you cannot provide the `redirect_uri` upon the SSO class initialization, you may simply omit
the parameter and provide it when calling `get_login_redirect` method.
```python
...
google_sso = GoogleSSO("my-client-id", "my-client-secret")
@app.get("/google/login")
async def google_login(request: Request):
"""Generate login url and redirect"""
return await google_sso.get_login_redirect(redirect_uri=request.url_for("google_callback"))
@app.get("/google/callback")
async def google_callback(request: Request):
...
```
### Specify scope
Since `0.4.0` you may specify `scope` when initializing the SSO class.
```python
from fastapi_sso.sso.microsoft import MicrosoftSSO
sso = MicrosoftSSO(client_id="client-id", client_secret="client-secret", scope=["openid", "email"])
```
### Additional query parameters
Since `0.4.0` you may provide additional query parameters to be
sent to the login screen.
E.g. sometimes you want to specify `access_type=offline` or `prompt=consent` in order for
Google to return `refresh_token`.
```python
async def google_login(request: Request):
return await google_sso.get_login_redirect(
redirect_uri=request.url_for("google_callback"),
params={"prompt": "consent", "access_type": "offline"}
)
```
## HTTP and development
**You should always use `https` in production**. But in case you need to test on `localhost` and do not want to
use self-signed certificate, make sure you set up redirect uri within your SSO provider to `http://localhost:{port}`
and then add this to your environment:
```bash
OAUTHLIB_INSECURE_TRANSPORT=1
```
And make sure you pass `allow_insecure_http = True` to SSO class' constructor, such as:
```python
google_sso = GoogleSSO("client-id", "client-secret", allow_insecure_http=True)
```
See [this issue](https://github.com/tomasvotava/fastapi-sso/issues/2) for more information.
## State
State is useful if you want the server to return something back to you to help you understand in what
context the authentication was initiated. It is mostly used to store the url you want your user to be redirected
to after successful login. You may use `.state` property to get the state returned from the server.
Example:
```python
from fastapi import Request
from fastapi.responses import RedirectResponse
# E.g. https://example.com/auth/login?return_url=https://example.com/welcome
async def google_login(return_url: str):
google_sso = GoogleSOO("client-id", "client-secret")
# Send return_url to Google as a state so that Google knows to return it back to us
return await google_sso.get_login_redirect(redirect_uri=request.url_for("google_callback"), state=return_url)
async def google_callback(request: Request):
google_sso = GoogleSOO("client-id", "client-secret")
user = await google_sso.verify_and_process(request)
# google_sso.state now holds your return_url (https://example.com/welcome)
return RedirectResponse(google_sso.state)
```
**Deprecation Warning**: legacy `use_state` argument in `SSOBase` constructor is deprecated and will be removed.
## Contributing
If you'd like to contribute and add your specific login provider, please see [CONTRIBUTING.md](CONTRIBUTING.md) file.