Develop Reference

Interceptor not working in Spring Boot GraphQL

Im using graphql-java-kickstart/graphql-spring-boot and I'd like to create an interceptor to add an HTTP header after processing the request.
When I'm sending a graphql request to the backend the the interceptor is not triggered. But some calls trigger the interceptor. For example when I'm opening /graphiql in my browser I see that the interceptor is triggered but when I send a graphql request from graphiql client it is not. Any idea why? Anybody got experience with this?
My config looks like this:
#Configuration
public class InterceptorConfig implements WebMvcConfigurer {
#Autowired
private TestInterceptor testInterceptor;
#Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(testInterceptor).addPathPatterns("/**");
}
}
Also my Interceptor:
#Slf4j
#Component
public class TestInterceptor extends HandlerInterceptorAdapter {
#Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)
throws Exception {
// post processing
log.info("hello there");
}
}

I have following interceptor that successfully works in my project:
My WebConfig:
#Configuration
public class WebConfig implements WebMvcConfigurer {
#Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(requestInterceptor);
}
#Autowired
private ControllerExecInterceptor requestInterceptor;
}
Where ControllerExecInterceptor defined as:
#Component
public class ControllerExecInterceptor extends HandlerInterceptorAdapter {
#Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws AccessDeniedException, Exception {
// ...
}
#Override
public boolean postHandle(HttpServletRequest request, HttpServletResponse
response, Object handler) throws {
// ...
}
}

find how many requests are on queue in thread safe spring controller

I am using a spring controller which returns a string from a threadsafe method.
so i have made the controller also thread safe.
I want to know how many request are there in queue simultaneously which are calling to the spring controller

Here is my suggestion how you can solve your issue.
Imagine you have this #Controller:
#Controller
public class MyController {
#Autowired
private IMyService service;
#RequestMapping(value = "/myPathName", method = RequestMethod.GET)
public String home(HttpServletRequest request, Model model) {
// you synchronized call
service.callSynchronized(request, model);
return "someJsp";
}
// +edit
#ResponseBody
#RequestMapping(value = "/queueStatus", method = RequestMethod.GET)
public String home(HttpServletRequest request) {
//
return "inQueue: " + request.getAttribute("inQueue");
}
}
Now you can define an interceptor and count the requests before and after execution:
public class RequestsInWorkInterceptor extends HandlerInterceptorAdapter {
private static final Logger _logger = LoggerFactory.getLogger(RequestsInWorkInterceptor.class);
private final AtomicLong counter = new AtomicLong();
#Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
String methodURI = request.getRequestURI();
long current;
if("myPathName".equals(methodURI){
current = counter.incrementAndGet();
_logger.debug("current {} clients in a queue", current);
} else {
current = counter.get(); // just get, no increment
}
// +edit: put the count in the request so you can get it in you controller
request.setAttribute("inQueue", current);
return super.preHandle(request, response, handler);
}
#Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
String methodURI = request.getRequestURI();
if("myPathName".equals(methodURI){
counter.decrementAndGet();
}
super.postHandle(request, response, handler, modelAndView);
}
}

You can get information about the number of active requests using Jetty's StatisticsHandler and JMX.
If you're using Jetty as an embedded container (the recommended approach), you can use an EmbeddedServletContainerCustomizer to set this up:
#Bean
public EmbeddedServletContainerCustomizer containerCustomizer() {
return new EmbeddedServletContainerCustomizer() {
#Override
public void customize(ConfigurableEmbeddedServletContainer container) {
((JettyEmbeddedServletContainerFactory) container)
.addServerCustomizers(new JettyServerCustomizer() {
#Override
public void customize(Server server) {
MBeanContainer mbContainer = new MBeanContainer(
ManagementFactory.getPlatformMBeanServer());
server.addEventListener(mbContainer);
server.addBean(mbContainer);
StatisticsHandler statisticsHandler = new StatisticsHandler();
statisticsHandler.setHandler(server.getHandler());
server.setHandler(statisticsHandler);
}
});
}
};
}
You'll need to add a dependency on org.eclipse.jetty:jetty-jmx to get access to MBeanContainer.
You can try with spring boot actuator. On endpoint /metrics you should have field "httpsessions.active"
public class RequesInterceptor extends HandlerInterceptorAdapter {
private static Object lock = new Object();
private static int count = 0
#Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException {
sinchronize(lock){
count++;
}
}
}

Unable to intercept and manipulate HttpServletResponse in Spring Boot

I have a requirement to Base64 decode every JSON request payload that my Spring Boot service receives. The JSON payload would have been Base64 encoded at the client before posting using the HTTP POST method. Further, I also need to Base64 encode the JSON response before presenting to the calling client application.
I am required to reduce boilerplate code by using handler interceptors.
I have already achieved the request/incoming leg of the operation by the use of interceptors but is yet to achieve this for the response leg.
I have posted the code snippets below. The code to intercept the response and base64 encode it is in the postHandle method of the interceptor class.
What am I doing wrong here?
Interceptor Class:
public class Base64ResponseEncodingInterceptor implements HandlerInterceptor {
private static final String DECODED_REQUEST_ATTRIB = "decodedRequest";
private static final String POST = "POST";
#Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView arg3) throws Exception {
try {
if (POST.equalsIgnoreCase(request.getMethod())) {
CharResponseWrapper res = new CharResponseWrapper(response);
res.getWriter();
byte[] encoded = Base64.encodeBase64(res.toString().getBytes());
byte[] encoded = Base64.encodeBase64(response.getHeader(ENCODED_RESPONSE_ATTRIB).getBytes());
response.getWriter().write(new String(encoded));
}
} catch (Exception e) {
throw new Exception(e.getMessage());
}
}
// preHandle and afterCompletion methods
// Omitted
}
The CharResponseWrapper Class used above:
public class CharResponseWrapper extends HttpServletResponseWrapper {
protected CharArrayWriter charWriter;
protected PrintWriter writer;
protected boolean getOutputStreamCalled;
protected boolean getWriterCalled;
public CharResponseWrapper(HttpServletResponse response) {
super(response);
charWriter = new CharArrayWriter();
}
#Override
public ServletOutputStream getOutputStream() throws IOException {
if (getWriterCalled) {
throw new IllegalStateException("getWriter already called");
}
getOutputStreamCalled = true;
return super.getOutputStream();
}
#Override
public PrintWriter getWriter() throws IOException {
if (writer != null) {
return writer;
}
if (getOutputStreamCalled) {
throw new IllegalStateException("getOutputStream already called");
}
getWriterCalled = true;
writer = new PrintWriter(charWriter);
return writer;
}
#Override
public String toString() {
String s = null;
if (writer != null) {
s = charWriter.toString();
}
return s;
}
}
JavaConfig Class where Interceptor is registered:
#Configuration
#EnableJpaRepositories(repositoryBaseClass = BaseRepositoryBean.class, basePackages = "")
#EntityScan(basePackages = { "com.companyname", "com.companyname.productname"})
public class RestConfig extends WebMvcConfigurerAdapter {
#Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new Base64ResponseEncodingInterceptor());
}
}
The Controller Class, where the Interceptor is used (Only the working request leg is shown here):
#Autowired
HttpServletRequest request;
String decodedRequest = null;
#ModelAttribute("decodedRequest")
public void getDecodedParam(){
decodedRequest = (String) request.getAttribute("decodedRequest");
}
The code in the postHandle method does not work. It is either the HttpServletResponse is null or I get an exception message:
getOutputStream already called
Update: Work around solution to reading the response directly in the ResponseBodyAdvice
In the Controller Class, I added the following:
#RestController
#RequestMapping("/api/ipmanager")
public class IPProfileRestController extends AbstractRestController {
#Autowired
HttpServletResponse response;
String encodedResponse = null;
#ModelAttribute("encodedResponse")
public void getEncodedResponse(){
response.setHeader("encodedResponse", StringUtils.EMPTY);
}
#RequestMapping(value = "/time", method = { RequestMethod.POST }, produces = { MediaType.APPLICATION_JSON_VALUE, MediaType.TEXT_PLAIN_VALUE }, consumes = {
MediaType.APPLICATION_JSON_VALUE })
public #ResponseBody String saveAccessClientTime(#RequestBody String ecodedRequest) {
// Some code here
String controllerResponse = prettyJson(iPProfileResponse);
response.setHeader("encodedResponse", controllerResponse);
return controllerResponse;
}
}
I have the following in the ResponseBodyAdvice
#ControllerAdvice
public class Base64EncodedResponseBodyAdvice implements ResponseBodyAdvice<Object> {
#Override
public boolean supports(MethodParameter returnType,
Class<? extends HttpMessageConverter<?>> converterType) {
return true;
}
#Override
public Object beforeBodyWrite(Object body,
MethodParameter returnType,
MediaType selectedContentType,
Class<? extends HttpMessageConverter<?>> converterType,
ServerHttpRequest request,
ServerHttpResponse response) {
String body1 = StringUtils.EMPTY;
// Encode the response and return
List<String> listOfHeaderValues = response.getHeaders().get("encodedResponse");
body1=new String(Base64.encodeBase64(listOfHeaderValues.get(0).getBytes()));
return body1;
}
}

As the Spring MVC documentation states:
the postHandle method of HandlerInterceptor is not always ideally
suited for use with #ResponseBody and ResponseEntity methods. In such
cases an HttpMessageConverter writes to and commits the response
before postHandle is called which makes it impossible to change the
response, for example to add a header. Instead an application can
implement ResponseBodyAdvice and either declare it as an
#ControllerAdvice bean or configure it directly on
RequestMappingHandlerAdapter.
With that being said:
What am I doing wrong here?
Since the response has been already committed, you can't change it. In order to change the response you should register a ResponseBodyAdvice<T> and put your response encoding logic there:
#ControllerAdvice
public class Base64EncodedResponseBodyAdvice implements ResponseBodyAdvice<Object> {
#Override
public boolean supports(MethodParameter returnType,
Class<? extends HttpMessageConverter<?>> converterType) {
return true;
}
#Override
public Object beforeBodyWrite(Object body,
MethodParameter returnType,
MediaType selectedContentType,
Class<? extends HttpMessageConverter<?>> converterType,
ServerHttpRequest request,
ServerHttpResponse response) {
// Encode the response and return
}
}

If your method is returning ResponseEntity<T> then write this code in postHandle() method of your HandlerInterceptor:
eg. response.addHeader("jwt_token", "kajdlakjd");
it will work!!

Spring Interceptor: how to populate model in preHandle method?

So basically question listed in title. Is there a way to populate org.springframework.ui.Model in preHandle method ?
public class SomeInterceptor extends HandlerInterceptorAdapter {
#Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// need to populate Model here
return true;
}
}

Why does FilterSecurityMetadataSource class to controller class take a longer time?

I have used Spring security oauth2 in our application. For some specific request, the time taken by FilterSecurityMetadataSource to controller is much higher.
FilterSecurityMetadataSource class:
public class FilterSecurityMetadataSource implements
FilterInvocationSecurityMetadataSource {
#Override
public List<ConfigAttribute> getAttributes(Object object) {
// ...
System.out.println("In FilterInvocation Class");
attributes = SecurityConfig.createListFromCommaDelimitedString(roles);
return attributes;
}
#Override
public Collection<ConfigAttribute> getAllConfigAttributes() {
return null;
}
#Override
public boolean supports(Class<?> clazz) {
return FilterInvocation.class.isAssignableFrom(clazz);
}
}
My controller class is like this:
#RestController
public class MobileController {
#RequestMapping(value = "/read/bills", method = RequestMethod.POST)
public Map method1(HttpServletRequest request, HttpServletResponse response) {
// ...
}
#RequestMapping(value = "/test/id", method = RequestMethod.GET)
public Map method2(HttpServletRequest request, HttpServletResponse response) {
// ...
}
#RequestMapping(value = "/test/item", method = RequestMethod.GET)
public Map method3(HttpServletRequest request, HttpServletResponse response) {
System.out.println("Test Method3");
// ...
}
}
On our server when I check, I found huge time difference in printing two SOUT .
What is be the reason?