is it possible to translate ServerHttpRequest and HttpServletRequest each other

Question

I am now using spring cloud gateway, from the spring could gateway filter I could get the ServerHttpRequest which come from org.springframework.http.server like this:

ServerHttpRequest request = (ServerHttpRequest) exchange.getRequest();

but the public library function just only accept HttpServletRequest which was in the package javax.servlet.http, is it possible to translate the two type of object? or must I write a overload function with different type of parameter? should I implement twice with the same function? BTW, this is my public function:

public static void handleLoginCheck(HttpServletRequest httpServletRequest) {
    AutoHeaderInfoRequest autoHeaderInfoRequest = AuthUtil.getAutoHeaderInfoRequest(httpServletRequest);
    if (autoHeaderInfoRequest.getAccessToken() == null) {
        throw ServiceException.NOT_LOGGED_IN_EXCEPTION;
    }
    if (!AuthUtil.verifyAccessToken(autoHeaderInfoRequest.getAccessToken())) {
        throw GlobalException.ACCESS_TOKEN_INVALID_EXCEPTION;
    }
    setRequestGlobalHeader(autoHeaderInfoRequest);
}

this function and all invoked function use HttpServletRequest.

Answer 1

According to Spring Docs:

ServerHttpRequest interface implementation is based on HttpServletRequest interface.

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Two points to be noted before you proceed:

1. The ServerWebExchange.getRequest() returns org.springframework.http.server.reactive.ServerHttpRequest and not org.springframework.http.server.ServerHttpRequest. Otherwise, you will get java.lang.ClassCastException. So, modify your code.

2. It is rather impossible to return HttpServletRequest from org.springframework.http.server.reactive.ServerHttpRequest and also org.springframework.http.server.reactive.ServletServerHttpServlet is a private class and can't be helpful in this case. Previously, considering the approach with org.springframework.http.server.ServletServerHttpServlet was my bad. Spring team also doesn't recommend the use of servlets in webflux application.

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You have to overload the public method and also modify the method calls associated with this :

public static void handleLoginCheck(ServerHttpRequest request) {
    HttpHeaders headers = request.getHeaders();
    if (headers.get("access_token") == null) {
        throw ServiceException.NOT_LOGGED_IN_EXCEPTION;
    }
    if (!AuthUtil.verifyAccessToken(headers.get("access_token"))) {
        throw GlobalException.ACCESS_TOKEN_INVALID_EXCEPTION;
    }
    setRequestGlobalHeader(headers);
}

Refer docs for more.