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/*-
* ============LICENSE_START=======================================================
* openECOMP : SDN-C
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights
* reserved.
* Modifications Copyright © 2018 IBM.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.ccsdk.sli.plugins.template;
import java.io.FileInputStream;
import java.io.StringWriter;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;
import org.onap.ccsdk.sli.core.sli.SvcLogicContext;
import org.onap.ccsdk.sli.core.sli.SvcLogicException;
import org.onap.ccsdk.sli.core.sli.SvcLogicJavaPlugin;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TemplateNode implements SvcLogicJavaPlugin {
private static final Logger logger = LoggerFactory.getLogger(TemplateNode.class);
public static final String TEMPLATE_PATH = "templatePath";
public static final String OUTPUT_PATH_KEY = "output";
public static final String PREFIX_KEY = "prefix";
public static final String REQUIRED_PARAMETERS_ERROR_MESSAGE = "templateName & outputPath are required fields";
protected static final String TEMPLATE_PROPERTIES_FILE_NAME = "template-node.properties";
protected static final String DEFAULT_PROPERTIES_DIR = "/opt/onap/ccsdk/data/properties";
protected static final String PROPERTIES_DIR_KEY = "SDNC_CONFIG_DIR";
protected VelocityEngine ve;
public TemplateNode() {
ve = new VelocityEngine();
setProperties();
ve.init();
}
protected void setProperties() {
String configDir = System.getProperty(PROPERTIES_DIR_KEY, DEFAULT_PROPERTIES_DIR);
Properties props = new Properties();
try (FileInputStream in = new FileInputStream(configDir + "/" + TEMPLATE_PROPERTIES_FILE_NAME)) {
props.load(in);
} catch (Exception e) {
logger.warn("Properties not loaded for template node, using sensible defaults. " + e.getMessage());
}
// give sensible defaults for required properties
ve.setProperty(RuntimeConstants.RESOURCE_LOADER, props.getProperty("velocity.resource.loader", "file"));
ve.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH,
props.getProperty("velocity.file.resource.loader.path", "/opt/onap/sdnc/restapi/templates"));
ve.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_CACHE,
props.getProperty("velocity.file.resource.loader.cache", "false"));
// allow flexible reading of additional velocity properties
for (String propertyName : props.stringPropertyNames()) {
if (propertyName.startsWith("velocity")) {
logger.error("set " + propertyName.substring(9) + "=" + props.get(propertyName));
ve.setProperty(propertyName.substring(9), props.get(propertyName));
}
}
}
public void evaluateTemplate(Map<String, String> params, SvcLogicContext ctx) throws SvcLogicException {
String templateName = params.get(TEMPLATE_PATH);
String outputPath = params.get(OUTPUT_PATH_KEY);
String prefix = params.get(PREFIX_KEY);
if (prefix != null && prefix.length() > 0) {
outputPath = prefix + "." + outputPath;
}
if (templateName == null || outputPath == null) {
throw new SvcLogicException(REQUIRED_PARAMETERS_ERROR_MESSAGE);
} else {
try {
Template template = ve.getTemplate(templateName);
VelocityContext context = new VelocityContext();
context.put("ctx", ctx);
context.put("params", params);
//Adding these values directly to context makes working with the values cleaner
for (Entry<String, String> entry : params.entrySet()) {
context.put(entry.getKey(), entry.getValue());
}
StringWriter sw = new StringWriter();
template.merge(context, sw);
ctx.setAttribute(outputPath, sw.toString());
} catch (Exception e) {
throw new SvcLogicException(e.getMessage());
}
}
}
}
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