add template node

add tempalte node implementation

Change-Id: Ifd3e6e7f2a7b9ff7029b523eab50274e440652cc
Issue-ID: CCSDK-440
Signed-off-by: Smokowski, Kevin (ks6305) <ks6305@att.com>

2 files changed, 116 insertions, 0 deletions

diff --git a/template-node/provider/src/main/java/org/onap/ccsdk/sli/plugins/template/TemplateNode.java b/template-node/provider/src/main/java/org/onap/ccsdk/sli/plugins/template/TemplateNode.java
new file mode 100644
index 000000000..8a9676817
--- /dev/null
+++ b/template-node/provider/src/main/java/org/onap/ccsdk/sli/plugins/template/TemplateNode.java
@@ -0,0 +1,108 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * openECOMP : SDN-C
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights
+ * 			reserved.
+ * ================================================================================
+ * 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.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 final static String TEMPLATE_PATH = "templatePath";
+    public final static String OUTPUT_PATH_KEY = "output";
+    public final static String PREFIX_KEY = "prefix";
+    public final static 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.error("Caught exception loading properties!", e);
+        }
+
+        // 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);
+                StringWriter sw = new StringWriter();
+                template.merge(context, sw);
+                ctx.setAttribute(outputPath, sw.toString());
+            } catch (Exception e) {
+                throw new SvcLogicException(e.getMessage());
+            }
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/template-node/provider/src/main/resources/OSGI-INF/blueprint/blueprint.xml b/template-node/provider/src/main/resources/OSGI-INF/blueprint/blueprint.xml
new file mode 100644
index 000000000..a8006b9b0
--- /dev/null
+++ b/template-node/provider/src/main/resources/OSGI-INF/blueprint/blueprint.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">
+
+	<bean id="templateNode" class="org.onap.ccsdk.sli.plugins.template.TemplateNode" />
+
+	<service id="templateNodeService" ref="templateNode" interface="org.onap.ccsdk.sli.plugins.template.TemplateNode" />
+
+</blueprint>
\ No newline at end of file