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/*-
* ============LICENSE_START=======================================================
* ONAP : APPC
* ================================================================================
* Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2017 Amdocs
* =============================================================================
* 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.appc.design.validator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.snakeyaml.Yaml;
import com.fasterxml.jackson.dataformat.yaml.snakeyaml.introspector.BeanAccess;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.resource.loader.StringResourceLoader;
import org.apache.velocity.runtime.resource.util.StringResourceRepository;
import org.onap.appc.design.services.util.DesignServiceConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class ValidatorService {
private static final Logger log = LoggerFactory.getLogger(ValidatorService.class);
public String execute(String action, String payload, String dataType) throws ValidatorException {
log.info("Received validation for action= " + action + "Data :" + payload + " dataType = " + dataType);
String validateResponse = null;
try{
switch (dataType) {
case DesignServiceConstants.DATA_TYPE_XML:
validateResponse = validateXML(payload);
break;
case DesignServiceConstants.DATA_TYPE_JSON:
validateResponse = validateJSON(payload);
break;
case DesignServiceConstants.DATA_TYPE_VELOCITY:
validateResponse = validateVelocity(payload);
break;
case DesignServiceConstants.DATA_TYPE_YAML:
validateResponse = validateYAML(payload);
break;
default:
break;
}
}
catch (ParserConfigurationException | SAXException | IOException e){
log.info("An error occurred while executing validator", e);
throw new ValidatorException("An error occurred while executing validator", e);
}
return validateResponse;
}
private String validateYAML(String payload) throws IOException {
try {
InputStream is = new ByteArrayInputStream(payload.getBytes());
Reader in = new InputStreamReader(is);
Yaml yaml = new Yaml();
yaml.setBeanAccess(BeanAccess.FIELD);
yaml.load(in);
return DesignServiceConstants.SUCCESS;
} catch (Exception e) {
log.error("Not a Valid YAML Format", e);
throw e;
}
}
private String validateVelocity(String payload) {
try {
VelocityEngine engine = new VelocityEngine();
engine.setProperty(Velocity.RESOURCE_LOADER, "string");
engine.addProperty("string.resource.loader.class", StringResourceLoader.class.getName());
engine.addProperty("string.resource.loader.repository.static", "false");
engine.init();
StringResourceRepository repo = (StringResourceRepository) engine
.getApplicationAttribute(StringResourceLoader.REPOSITORY_NAME_DEFAULT);
repo.putStringResource("TestTemplate", payload);
return DesignServiceConstants.SUCCESS;
} catch (ResourceNotFoundException | ParseErrorException | MethodInvocationException e) {
log.error("Not a Valid Velocity Template", e);
throw e;
}
}
private String validateJSON(String payload) throws IOException {
try {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.readTree(payload);
return DesignServiceConstants.SUCCESS;
} catch (JsonProcessingException e) {
log.error("Not a Valid JSON file", e);
throw e;
}
}
private String validateXML(String payload) throws IOException, SAXException, ParserConfigurationException {
try {
DocumentBuilderFactory dBF = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = dBF.newDocumentBuilder();
builder.parse(new InputSource(new ByteArrayInputStream(payload.getBytes("utf-8"))));
return DesignServiceConstants.SUCCESS;
} catch (ParserConfigurationException | SAXException | IOException e) {
log.info("Error While parsing Payload", e);
throw e;
}
}
}
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