OAuthlib-Based Access Token Exchange Function

This function uses the OAuthlib library to exchange an authorization code for an access token. It first parses the authorization response to extract the authorization code, then creates a BackendApplicationClient and a TokenRequest. Finally, it parses the token request and exchanges the authorization code for an access token.

Technology Stack : OAuthlib, urllib.parse

Code Type : OAuth 2.0 Token Exchange

Code Difficulty : Intermediate

                
                    
def get_access_token(client_id, client_secret, token_url, authorization_response):
    from oauthlib.oauth2 import BackendApplicationClient, TokenRequest
    from oauthlib.oauth2 import TokenResponse
    from urllib.parse import urlparse, parse_qs

    # Parse the authorization response to extract the authorization code
    parsed_url = urlparse(authorization_response)
    query_components = parse_qs(parsed_url.query)
    authorization_code = query_components.get('code', [None])[0]

    # Create a client
    client = BackendApplicationClient(client_id=client_id)
    token_request = TokenRequest(client=client,
                                 token_url=token_url,
                                 authorization_response=authorization_response,
                                 code=authorization_code)

    # Create a token response object
    token_response = TokenResponse()

    # Exchange the authorization code for a token
    token_response = token_response.parse(token_request, state=None)

    return token_response.token