Android - Retrofit 2 - Authenticator Result

Question

I\'m trying to use Retrofit (2.0.0-beta3), but when using an Authenticator to add a token, I can\'t seem to get the data from the synchronous call. Our logging on the back-e

Answer 1

I managed to get a decent solution using the TokenAuthenticator and an Interceptor and thought I'd share the idea as it may help some others.

Adding the 'TokenInterceptor' class that handles adding the token to the header is the token exists, and the 'TokenAuthenticator' class handles the case when there is no token, and we need to generate one.

I'm sure there are some better ways to implement this, but it's a good starting point I think.

public static class TokenAuthenticator implements Authenticator {
    @Override
    public Request authenticate( Route route, Response response) throws IOException {
    ...
    Session body = call.execute().body();
    Logger.d("Session token: " + body.token);
    // Storing the token somewhere.
    session.token = body.token;
    ...
}


private static class TokenInterceptor implements Interceptor {
@Override
    public Response intercept( Chain chain ) throws IOException {
        Request originalRequest = chain.request();

        // Nothing to add to intercepted request if:
        // a) Authorization value is empty because user is not logged in yet
        // b) There is already a header with updated Authorization value
        if (authorizationTokenIsEmpty() || alreadyHasAuthorizationHeader(originalRequest)) {
            return chain.proceed(originalRequest);
        }

        // Add authorization header with updated authorization value to  intercepted request
        Request authorisedRequest = originalRequest.newBuilder()
                .header("Auth-Token", session.token )
                .build();
        return chain.proceed(authorisedRequest);
    }
}

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Source:

http://lgvalle.xyz/2015/07/27/okhttp-authentication/