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

我通过为Okhttp编写一个Interceptor来解决这个问题.它检查网络呼叫的状态代码.如果是403,请调用Auth0服务器并请求新的id_token.然后在原始请求的新版本中使用此令牌.

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();
             }
         }
    )