OAuth2 Access Token Fetcher

This function uses the OAuth2 client and session from the OAuthlib library to obtain an access token. It takes client ID, client secret, token URL, authorization URL, redirect URI, and authorization code as parameters, and then returns the access token.

Technology Stack : OAuthlib

Code Type : Function

Code Difficulty : Intermediate

                
                    
def fetch_access_token(client_id, client_secret, token_url, auth_url, redirect_uri, code):
    from oauthlib.oauth2 import BackendApplicationClient, TokenRequest
    from oauthlib.oauth2 import BackendSession
    from requests import post

    # Create an OAuth2 client with the backend application client
    client = BackendApplicationClient(client_id=client_id)
    
    # Create a token request
    token_request = TokenRequest(
        client=client,
        token_url=token_url,
        authorization_url=auth_url,
        redirect_uri=redirect_uri,
        code=code,
        auth_method='client_secret_post'
    )
    
    # Create a session with the token request
    session = BackendSession(client=client)
    
    # Exchange the code for a token
    token_response = session.post(token_url, data=token_request.to_dict())
    
    # Return the access token
    return token_response.json().get('access_token')