/* * Copyright [2017] Wikimedia Foundation * * 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.o19s.es.template.mustache; import com.github.mustachejava.Mustache; import com.github.mustachejava.MustacheException; import org.apache.logging.log4j.Logger; import org.apache.logging.log4j.message.ParameterizedMessage; import org.apache.logging.log4j.util.Supplier; import org.elasticsearch.SpecialPermission; import org.apache.logging.log4j.LogManager; import java.io.StringReader; import java.io.StringWriter; import java.security.AccessController; import java.security.PrivilegedAction; import java.util.Map; public class MustacheUtils { public static final String TEMPLATE_LANGUAGE = "mustache"; private static final Logger logger = LogManager.getLogger(MustacheUtils.class); private static final SpecialPermission SPECIAL_PERMS = new SpecialPermission(); /** * We store templates internally always as json */ private static final CustomMustacheFactory FACTORY = new CustomMustacheFactory(); public static Mustache compile(String name, String template) { // Don't use compile(String name) to avoid caching in the factory try { return FACTORY.compile(new StringReader(template), name); } catch (MustacheException me) { throw new IllegalArgumentException(me.getMessage(), me); } } public static String execute(Mustache template, Map<String, Object> params) { final StringWriter writer = new StringWriter(); try { // crazy reflection here SecurityManager sm = System.getSecurityManager(); if (sm != null) { sm.checkPermission(SPECIAL_PERMS); } AccessController.doPrivileged((PrivilegedAction<Void>) () -> { template.execute(writer, params); return null; }); } catch (Exception e) { logger.error((Supplier<?>) () -> new ParameterizedMessage("Error running {}", template), e); throw new IllegalArgumentException("Error running " + template, e); } return writer.toString(); } }