+package org.argeo.cms.auth;
+
+import java.security.AccessControlContext;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.function.Supplier;
+
+import javax.security.auth.Subject;
+import javax.servlet.http.HttpServletRequest;
+
+import org.osgi.service.http.HttpContext;
+
+/** Authentications utilities when using servlets. */
+public class ServletAuthUtils {
+ public final static <T> T doAs(Supplier<T> supplier, HttpServletRequest req) {
+ return Subject.doAs(
+ Subject.getSubject((AccessControlContext) req.getAttribute(AccessControlContext.class.getName())),
+ new PrivilegedAction<T>() {
+
+ @Override
+ public T run() {
+ return supplier.get();
+ }
+
+ });
+ }
+
+ public final static void configureRequestSecurity(HttpServletRequest req) {
+ if (req.getAttribute(AccessControlContext.class.getName()) != null)
+ throw new IllegalStateException("Request already authenticated.");
+ AccessControlContext acc = AccessController.getContext();
+ req.setAttribute(HttpContext.REMOTE_USER, CurrentUser.getUsername());
+ req.setAttribute(AccessControlContext.class.getName(), acc);
+ }
+
+ public final static void clearRequestSecurity(HttpServletRequest req) {
+ if (req.getAttribute(AccessControlContext.class.getName()) == null)
+ throw new IllegalStateException("Cannot clear non-authenticated request.");
+ req.setAttribute(HttpContext.REMOTE_USER, null);
+ req.setAttribute(AccessControlContext.class.getName(), null);
+ }
+}