如何在不添加特定代码的情况下处理auth0 403错误(Retrofit / okhttp / RxAndroid)

为了测试,我编写了一个小的Web服务器来检查TestHeader是否失败或成功,如果失败则返回403.

public class AuthenticationInterceptor implements Interceptor {

    @Override
    public Response intercept(Chain chain) throws IOException {
        Request originalRequest = chain.request();
        Request authenticationRequest = originalRequest.newBuilder()
                .header("TestHeader","fail")
                .build();

        Response origResponse = chain.proceed(authenticationRequest);

        // server should give us a 403,since the header contains 'fail'
        if (origResponse.code() == 403) {
            String refreshToken = "abcd"; // you got this from Auth0 when logging in

            // start a new synchronous network call to Auth0
            String newIdToken = fetchNewIdTokenFromAuth0(refreshToken);

            // make a new request with the new id token
            Request newAuthenticationRequest = originalRequest.newBuilder()
                    .header("TestHeader","succeed")
                    .build();

            // try again
            Response newResponse = chain.proceed(newAuthenticationRequest);

            // hopefully we Now have a status of 200
            return newResponse;
        } else {
            return origResponse;
        }
    }
}

然后我将这个Interceptor附加到一个OkHttpClient,我将其插入Retrofit适配器：

// add the interceptor to an OkHttpClient

public static OkHttpClient getAuthenticatingHttpClient() {
    if (sAuthenticatingHttpClient == null) {
        sAuthenticatingHttpClient = new OkHttpClient();
        sAuthenticatingHttpClient.interceptors().add(new AuthenticationInterceptor());
    }
    return sAuthenticatingHttpClient;
}

// use the OkHttpClient in a Retrofit adapter

mTestRestAdapter = new RestAdapter.Builder()
    .setClient(new OkClient(Network.getAuthenticatingHttpClient()))
    .setEndpoint("http://ip_of_server:port")
    .setLogLevel(RestAdapter.LogLevel.FULL)
    .build();

// call the Retrofit method on buttonclick

ViewObservable.clicks(testNetworkButton)
    .map(new Func1<OnClickEvent,Object>() {
             @Override
             public Object call(OnClickEvent onClickEvent) {
                 return mTestRestAdapter.fetchTestResponse();
             }
         }
    )