/* * Copyright 2018 Netflix, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.netflix.zuul.scriptManager; import com.google.common.annotations.VisibleForTesting; import com.netflix.zuul.ZuulApplicationInfo; import com.netflix.zuul.filters.BaseFilter; import groovy.lang.GroovyClassLoader; import org.codehaus.groovy.control.CompilationFailedException; /** * verifies that the given source code is compilable in Groovy, can be instantiated, and is a ZuulFilter type * * @author Mikey Cohen * Date: 6/12/12 * Time: 7:12 PM */ public class FilterVerifier { @VisibleForTesting static final FilterVerifier INSTANCE = new FilterVerifier(); /** * @return Singleton */ public static FilterVerifier getInstance() { return INSTANCE; } /** * verifies compilation, instanciation and that it is a ZuulFilter * * @return a FilterInfo object representing that code */ public FilterInfo verifyFilter(String sFilterCode) throws CompilationFailedException, IllegalAccessException, InstantiationException { Class<?> groovyClass = compileGroovy(sFilterCode); Object instance = instantiateClass(groovyClass); checkZuulFilterInstance(instance); BaseFilter filter = (BaseFilter) instance; String filter_id = FilterInfo.buildFilterID(ZuulApplicationInfo.getApplicationName(), filter.filterType(), groovyClass.getSimpleName()); return new FilterInfo(filter_id, sFilterCode, filter.filterType(), groovyClass.getSimpleName(), filter.disablePropertyName(), "" + filter.filterOrder(), ZuulApplicationInfo.getApplicationName()); } Object instantiateClass(Class<?> groovyClass) throws InstantiationException, IllegalAccessException { return groovyClass.newInstance(); } void checkZuulFilterInstance(Object zuulFilter) throws InstantiationException { if (!(zuulFilter instanceof BaseFilter)) { throw new InstantiationException("Code is not a ZuulFilter Class "); } } /** * compiles the Groovy source code * */ public Class<?> compileGroovy(String sFilterCode) throws CompilationFailedException { GroovyClassLoader loader = new GroovyClassLoader(); return loader.parseClass(sFilterCode); } }