/*
* Copyright 2016 the original author or authors.
*
* 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 org.springframework.cloud.stream.module.transform;
import java.util.regex.Matcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Processor;
import org.springframework.cloud.stream.module.common.ScriptVariableGeneratorConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.Resource;
import org.springframework.integration.annotation.Transformer;
import org.springframework.integration.dsl.scripting.Scripts;
import org.springframework.integration.handler.MessageProcessor;
import org.springframework.integration.scripting.ScriptVariableGenerator;
/**
* A Processor module that transforms messages using a supplied script. The script
* code is passed in directly via property. For more information on Spring script
* processing, see
* <a href=
* "https://spring.io/blog/2011/12/08/spring-integration-scripting-support-part-1">
* this blog article</a>.
*
* @author Andy Clement
*/
@EnableBinding(Processor.class)
@Import(ScriptVariableGeneratorConfiguration.class)
@EnableConfigurationProperties(ScriptableTransformProcessorProperties.class)
public class ScriptableTransformProcessor {
private static final String NEWLINE_ESCAPE = Matcher.quoteReplacement("\\n");
private static final String DOUBLE_DOUBLE_QUOTE = Matcher.quoteReplacement("\"\"");
private static Logger logger = LoggerFactory.getLogger(ScriptableTransformProcessor.class);
@Autowired
private ScriptVariableGenerator scriptVariableGenerator;
@Autowired
private ScriptableTransformProcessorProperties properties;
@Bean
@Transformer(inputChannel = Processor.INPUT, outputChannel = Processor.OUTPUT)
public MessageProcessor<?> transformer() {
String language = this.properties.getLanguage();
String script = this.properties.getScript();
logger.info("Input script is '{}', language is '{}'", script, language);
Resource scriptResource = new ByteArrayResource(decodeScript(script).getBytes()) {
// TODO until INT-3976
@Override
public String getFilename() {
// Only the groovy script processor enforces this requirement for a name
return "StaticScript";
}
};
return Scripts.script(scriptResource)
.lang(language)
.variableGenerator(this.scriptVariableGenerator)
.get();
}
private static String decodeScript(String script) {
String toProcess = script;
// If it has both a leading and trailing double quote, remove them
if (toProcess.startsWith("\"") && toProcess.endsWith("\"")) {
toProcess = script.substring(1, script.length() - 1);
}
return toProcess.replaceAll(NEWLINE_ESCAPE, "\n").replaceAll(DOUBLE_DOUBLE_QUOTE, "\"");
}
}