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package in.shop2020.serving.interceptors;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.Map;
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import in.shop2020.serving.services.UserSessionInfo;
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import in.shop2020.serving.utils.DesEncrypter;
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import javax.servlet.http.Cookie;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpSession;
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import org.apache.juli.logging.Log;
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import org.apache.juli.logging.LogFactory;
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import org.apache.struts2.ServletActionContext;
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import com.opensymphony.xwork2.ActionContext;
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import com.opensymphony.xwork2.ActionInvocation;
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import com.opensymphony.xwork2.ValidationAwareSupport;
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import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
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public class UserInterceptor extends AbstractInterceptor {
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/**
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*
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*/
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private static final long serialVersionUID = -4125815700236506235L;
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private static Log log = LogFactory.getLog(UserInterceptor.class);
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public static final String USER_INFO = "userinfo";
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private Map<String, Cookie> cookiesMap = null;
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private Cookie userCookie = null;
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private DesEncrypter desEncrypter = new DesEncrypter("shop2020");
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@Override
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public String intercept(ActionInvocation invocation) throws Exception {
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final Object action = invocation.getAction();
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HttpServletRequest request = ServletActionContext.getRequest();
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HttpSession session = request.getSession(); // Get the existing session or create a new one
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//getCookiesMap(request);
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String requestedSessionId = request.getRequestedSessionId();
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UserSessionInfo userInfo = null;
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createCookiesMap(request);
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// Check if this is a brand new request with no prior cookies set; OR
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// If the request is for an active session.
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if(requestedSessionId == null || request.isRequestedSessionIdValid()){
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log.info("Request received for valid session: " + requestedSessionId);
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// Set the userinfo and the uid cookie if they're not already set.
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userInfo = (UserSessionInfo) session.getAttribute(USER_INFO);
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if(userInfo == null || userInfo.getUserId() == -1) {
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userInfo = new UserSessionInfo(session.getId());
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session.setAttribute(USER_INFO, userInfo);
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}
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createUserCookie(userInfo.getUserId(), false);
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} else {
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log.info("Request received for invalid session: " + requestedSessionId);
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// If the requested session is inactive, do the following:
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// 1. Retrieve the user for the requested session from the user cookie
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// 2. Add the retrieved user to the newly created session above.
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// 3. Update the uid cookie to ensure that a valid user is set in the session
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userInfo = createAndGetSessionFromUIDCookie(session);
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session.setAttribute(USER_INFO, userInfo);
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createUserCookie(userInfo.getUserId(), true);
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}
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if (action instanceof UserAware) {
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UserAware sessionAction = (UserAware) action;
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sessionAction.setSession(session);
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sessionAction.setUserSessionInfo(userInfo);
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sessionAction.setCookiesMap(cookiesMap);
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sessionAction.setUserCookie(userCookie);
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}
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return invocation.invoke();
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}
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private void createCookiesMap(HttpServletRequest request) {
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cookiesMap = new HashMap<String, Cookie>();
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Cookie[] cookies = request.getCookies();
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// This check is necessary for the first request when no cookies are
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// sent.
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if(cookies==null)
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return;
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for (Cookie cookie : cookies)
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cookiesMap.put(cookie.getName(), cookie);
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}
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private void createUserCookie(long userId, boolean force) {
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userCookie = (Cookie) cookiesMap.get("uid");
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String encryptedUserId = desEncrypter.encrypt(userId + "");
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if(force || userCookie == null || !(encryptedUserId + "").equals(userCookie.getValue())){
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userCookie = new Cookie("uid", encryptedUserId);
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}
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}
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private UserSessionInfo createAndGetSessionFromUIDCookie(HttpSession session) {
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userCookie = (Cookie) cookiesMap.get("uid");
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UserSessionInfo userInfo = null;
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if(userCookie != null){
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String uidString = userCookie.getValue();
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if(uidString != null){
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try {
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Long receivedUID = Long.parseLong(desEncrypter.decrypt(uidString));
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userInfo = new UserSessionInfo(receivedUID, session.getId());
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session.setAttribute(USER_INFO, userInfo);
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} catch (NumberFormatException nfe) {
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log.error("The UID cookie contains an unparseable userID");
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}
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}
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}
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return userInfo;
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}
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}
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