End Point API, FastAPI and supabase, sign_in & sign_out user

Question

I'm facing a problem with my backend app, I want to create 3 endpoint API:

• /login user
• /logout
• /getuser I'm using python FastAPI and supabase, the question is how to create session from my backend app to get connected user information to handle th log_out and the log_in.

log_in function endpoint

@app.post('/login')
async def handel_login(user_mail: str):
    if check(user_mail):
        print(supabase.auth.sign_in(email=user_mail))
    else:
        print("incorrect form of email")

log_ou endpoint

@app.get('/logout')
async def handel_logout():
    error = supabase.auth.sign_out()
    return error

getuser endpoint

@app.get('/getuser')
async def get_user():
    user = supabase.auth.user()
    return user

in all of this I get None responses!

Answer 1

I was interested in this because I had a next.js app that used supabase cookies for auth. That proved too difficult to pass to the FastApi service. Instead, I extract the access_token via the session, and then just pass it in via authorization header per the fastapi security tutorial.

Answer 2

Supabase-py maintainer here - thanks for the query! FastAPI uses Starlet under the hood so your probably want to make use of the Session Middleware provided by Starlet.

Thereafter, you can do something similar of this format. This is for Django so you may need to make minor tweaks:

try:
    data = supabase.auth.sign_in(email="[email protected]", password="supersecurepassword")
        request.session['user'] = data.json()
except APIError:
    pass

Thereafter, you can check if the user is authenticated by reading from the session and validating the JWT.

Hope this helps and please let me know if there are any further issues.

Additional References

[0] - session object in Fastapi similar to flask