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[Feature Request] PKCE with Non Interactive Authentication #728

@tanios13

Description

@tanios13

MSAL client type

Public

Problem Statement

Hello,

I would like to create a flask webapp where the user authenticate with the PublicClientApplication and not the ConfidentialClientApplication. For this, I read in the documentation that I should use PKCE.

I did the following:

flow = msal_app.initiate_auth_code_flow(
        scopes=["User.Read"],
        redirect_uri=REDIRECT_URI
    )
    
session["flow"] = flow

and then.

result = msal_app.acquire_token_by_auth_code_flow(
                session.get("flow", {}), 
                request.args
            )

I saw that the flow dict contains the code verifier which should be enough for the PKCE. However, I get the following error:

invalid_client - AADSTS7000218: The request body must contain the following parameter: 'client_assertion' or 'client_secret'.

Proposed solution

I would like a way of authenticating without storing the Client_Secret or using Interactive Browser, i.e. using PKCE.

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