okhttp加解密拦截器

public Response (Chain chain) throws IOException {
    Request request = chain.request();
    String url = request.url().toString();
    String method = request.method();
    Log.i(TAG, "url为:" + url + "nmethod为:" + method);
    request = encrypt(request);
    Response response = chain.proceed(request);
    response = decrypt(response);
    return response;
  }

private Request encrypt(Request request) throws IOException {
    RequestBody requestBody = request.body();
    if (requestBody != null) {
        okio.Buffer buffer = new okio.Buffer();
        requestBody.writeTo(buffer);
        Charset charset = Charset.forName("UTF-8");
        MediaType contentType = requestBody.contentType();
        if (contentType != null) {
            charset = contentType.charset(charset);
        }
        String string = buffer.readString(charset);
        Log.i(TAG, "请求的原数据为:" + string);
        
        String encryptStr = encrypt(string);
        RequestBody body = MultipartBody.create(contentType, encryptStr);
        Request.Builder builder = request
                        .newBuilder()
                        .post(body)
                        .build();
        return request;
}

private Response decrypt(Response response) throws IOException {
    if (response.isSuccessful()) {
        //the response data
        ResponseBody body = response.body();
        BufferedSource source = body.source();
        source.request(Long.MAX_VALUE);
        // Buffer the entire body
        Buffer buffer = source.buffer();
        Charset charset = Charset.defaultCharset();
        MediaType contentType = body.contentType();
        if (contentType != null) {
            charset = contentType.charset(charset);
        }
        String decryptStr = buffer.clone().readString(charset);
        // TODO: decrypt
        String string = decrypt(decryptStr);
        Log.i(TAG, "响应的数据解密后为:" + string );
        ResponseBody responseBody = ResponseBody.create(contentType, bodyString);
        response = response.newBuilder().body(responseBody).build();
    }
    return response;
}