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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019-2020 Nordix 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.dcaegen2.services.pmmapper.utils;
import java.nio.file.Files;
import java.util.HashMap;
import java.util.stream.Stream;
import lombok.NonNull;
import org.onap.dcaegen2.services.pmmapper.mapping.Mapper;
import org.onap.dcaegen2.services.pmmapper.model.Event;
import org.onap.logging.ref.slf4j.ONAPLogAdapter;
import org.slf4j.LoggerFactory;
import org.xml.sax.SAXException;
import javax.xml.XMLConstants;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import java.io.IOException;
import java.io.StringReader;
import java.nio.file.Path;
public class XMLValidator {
private static final ONAPLogAdapter logger = new ONAPLogAdapter(LoggerFactory.getLogger(Mapper.class));
private HashMap<String, Schema> schemas;
private SchemaFactory schemaFactory;
public XMLValidator(Path schemaDirectory) {
logger.unwrap().trace("Constructing schema from {}", schemaDirectory);
schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
schemas = new HashMap<>();
try (Stream<Path> paths = Files.walk(schemaDirectory)) {
paths.filter(Files::isRegularFile).forEach(this::addSchema);
} catch (IOException exception) {
logger.unwrap().error("Failed to walk schema directory {}", schemaDirectory, exception);
throw new IllegalArgumentException("Failed to walk template directory {}", exception);
}
}
private void addSchema(Path schema) {
logger.unwrap().debug("Loading schema from {}", schema.toString());
try {
schemas.put(schema.getFileName().toString(), schemaFactory.newSchema(schema.toFile()));
} catch(SAXException exception) {
logger.unwrap().error("Failed to discover a valid schema at {}", schema, exception);
throw new IllegalArgumentException("Failed to discover a valid schema from given path", exception);
}
}
public boolean validate(@NonNull Event event) {
try {
Validator validator = schemas.get(event.getMetadata().getFileFormatType()).newValidator();
validator.validate(new StreamSource(new StringReader(event.getBody())));
logger.unwrap().info("XML validation successful {}", event);
return true;
} catch (SAXException | IOException exception) {
logger.unwrap().info("XML validation failed {}", event, exception);
return false;
}
}
}
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