Android Sign in for Python backend

[YDA93]

Quick python integration in READ.md will be really helpful!

Python Integration Example

from urllib.parse import unquote

def apple_login(request):
   """ Post request """
   redirect_data = unquote(request.body)
   redirect = f"intent://callback?{redirect_data}#Intent;package=YOUR.ANDROID.PACKAGE;scheme=signinwithapple;end"
   print(f"redirecting to {redirect}")
   response = HttpResponse("", status=307)
   response['Location'] = redirect
   return response

And DONT forget to add accessToken attribute to credential otherwise it won't work:

final credential = OAuthProvider("apple.com").credential(
        idToken: appleCredential.identityToken,
        accessToken: appleCredential.authorizationCode, <--------- HERE
        rawNonce: rawNonce,
      );

[HenriBeck]

Quick python integration in READ.md will be really helpful!

I don't think we should overload the README.md with this because not everyone will use Python.
We can think about having specific docs/python.md files for implementations of the backend in the respective languages.

Feel free to create a PR for this.

[MCYBA]

For Flask:

from urllib import parse
from flask import Flask, Response, request, redirect

ANDROID_PACKAGE_ID = "YOUR_PACKAGE"

@app.route('/callbacks/sign_in_with_apple', methods=['POST'])
def apple_login():

    if request.method == 'POST':
        try:
            return redirect(f'intent://callback?{parse.urlencode(request.form.to_dict(flat=True))}#Intent;package={ANDROID_PACKAGE_ID};scheme=signinwithapple;end', code=307)
        except Exception as e:
            return Response(status=405)
    else:
        return Response(status=405)
        # POST Error 405 Method Not Allowed

[Mowinski]

For FastAPI:

from urllib.parse import unquote
from starlette.requests import Request
from starlette.responses import RedirectResponse


@app.post(
    "/auth/token/apple/callback",
    summary="Create redirect url for android apple login",
    status_code=status.HTTP_307_TEMPORARY_REDIRECT,
)
async def apple_callback(request: Request):
    body = (await request.body()).decode("utf-8")
    url = f"intent://callback?{unquote(body)}#Intent;package={ANDROID_PACKAGE_ID};scheme=signinwithapple;end"
    return RedirectResponse(url, status_code=status.HTTP_307_TEMPORARY_REDIRECT)