[EZAF-2078] MultimechsAuthFilter init error (apache#1094)

Co-authored-by: Egor Krivokon <>

Author: ekrivokonmapr

core/src/main/java/org/apache/spark/ui/filters/FilterConfigWrapper.java

@@ -0,0 +1,48 @@
+package org.apache.spark.ui.filters;
+
+import org.apache.commons.collections.iterators.IteratorEnumeration;
+
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletContext;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
+
+public class FilterConfigWrapper implements FilterConfig {
+
+  private Map<String, String> conf = new HashMap<>();
+  private ServletContext servletContext;
+  private String filterName;
+
+  @Override
+  public String getFilterName() {
+    return filterName;
+  }
+
+  public void setFilterName(String filterName) {
+    this.filterName = filterName;
+  }
+
+  @Override
+  public ServletContext getServletContext() {
+    return servletContext;
+  }
+
+  public void setServletContext(ServletContext servletContext) {
+    this.servletContext = servletContext;
+  }
+
+  @Override
+  public String getInitParameter(String s) {
+    return conf.get(s);
+  }
+
+  public void setInitParameter(String key, String value) {
+    conf.put(key, value);
+  }
+
+  @Override
+  public Enumeration<String> getInitParameterNames() {
+    return new IteratorEnumeration(conf.keySet().iterator());
+  }
+}

core/src/main/java/org/apache/spark/ui/filters/MultiauthWebUiFilter.java

@@ -0,0 +1,28 @@
+package org.apache.spark.ui.filters;
+
+import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
+
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import java.util.Enumeration;
+
+public class MultiauthWebUiFilter extends AuthenticationFilter {
+
+  @Override
+  public void init(FilterConfig filterConfig) throws ServletException {
+    FilterConfigWrapper filterConfigWrapper = new FilterConfigWrapper();
+    Enumeration<String> parameterNames = filterConfig.getInitParameterNames();
+    filterConfigWrapper.setFilterName(filterConfig.getFilterName());
+    filterConfigWrapper.setServletContext(filterConfig.getServletContext());
+    while (parameterNames.hasMoreElements()) {
+      String key = parameterNames.nextElement();
+      String value = filterConfig.getInitParameter(key);
+      filterConfigWrapper.setInitParameter(key, value);
+    }
+
+    filterConfigWrapper.setInitParameter(AuthenticationFilter.AUTH_TYPE,
+      "org.apache.hadoop.security.authentication.server.MultiMechsAuthenticationHandler");
+
+    super.init(filterConfigWrapper);
+  }
+}