Add UsernameLoggingFilter to work with new security code

zanata-war/src/main/java/org/zanata/security/UsernameLoggingFilter.java

@@ -0,0 +1,59 @@
+// Adapted from org.jboss.seam.web.LoggingFilter in Seam 2.3.1
+
+package org.zanata.security;
+
+import java.io.IOException;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpSession;
+
+import org.apache.log4j.MDC;
+import org.jboss.seam.ScopeType;
+import org.jboss.seam.annotations.Install;
+import org.jboss.seam.annotations.Name;
+import org.jboss.seam.annotations.Scope;
+import org.jboss.seam.annotations.intercept.BypassInterceptors;
+import org.jboss.seam.annotations.web.Filter;
+import org.jboss.seam.web.AbstractFilter;
+import org.zanata.servlet.MDCInsertingServletFilter;
+
+/**
+ * This filter adds the authenticated user name to the log4j
+ * mapped diagnostic context so that it can be included in
+ * formatted log output if desired, by adding %X{username}
+ * to the pattern.
+ *
+ * @author Eric Trautman
+ */
+@Scope(ScopeType.APPLICATION)
+@Name("org.jboss.seam.web.loggingFilter")
+@BypassInterceptors
+@Filter(within="org.jboss.seam.web.authenticationFilter")
+@Install(classDependencies="org.apache.log4j.Logger",
+        dependencies="org.jboss.seam.security.identity",
+        precedence=Install.APPLICATION)
+public class UsernameLoggingFilter extends AbstractFilter {
+
+    @Override
+    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
+            throws IOException, ServletException {
+        HttpSession session = ((HttpServletRequest) servletRequest).getSession(false);
+        if (session!=null) {
+            Object attribute = session.getAttribute("org.jboss.seam.security.identity");
+            if (attribute instanceof ZanataIdentity) {
+                ZanataIdentity identity = (ZanataIdentity) attribute;
+                ZanataCredentials credentials = identity.getCredentials();
+                String username = credentials != null ? credentials.getUsername() : null;
+                if (username != null) {
+                    MDC.put(MDCInsertingServletFilter.USERNAME, username);
+                }
+            }
+        }
+        filterChain.doFilter(servletRequest, servletResponse);
+        MDC.remove(MDCInsertingServletFilter.USERNAME);
+    }
+}