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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2020 Pantheon.tech
* ================================================================================
* 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.cps.rest.utils;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.opendaylight.yangtools.yang.common.YangConstants.RFC6020_YANG_FILE_EXTENSION;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import org.onap.cps.spi.exceptions.CpsException;
import org.onap.cps.spi.exceptions.ModelValidationException;
import org.springframework.web.multipart.MultipartFile;
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class MultipartFileUtil {
/**
* Extracts yang resources from multipart file instance.
*
* @param multipartFile the yang file uploaded
* @return yang resources as {map} where the key is original file name, and the value is file content
* @throws ModelValidationException if the file name extension is not '.yang'
* @throws CpsException if the file content cannot be read
*/
public static Map<String, String> extractYangResourcesMap(final MultipartFile multipartFile) {
return ImmutableMap.of(extractYangResourceName(multipartFile), extractYangResourceContent(multipartFile));
}
private static String extractYangResourceName(final MultipartFile multipartFile) {
final String fileName = checkNotNull(multipartFile.getOriginalFilename(), "Missing filename.");
if (!fileName.endsWith(RFC6020_YANG_FILE_EXTENSION)) {
throw new ModelValidationException("Unsupported file type.",
String.format("Filename %s does not end with '%s'", fileName, RFC6020_YANG_FILE_EXTENSION));
}
return fileName;
}
private static String extractYangResourceContent(final MultipartFile multipartFile) {
try {
return new String(multipartFile.getBytes(), StandardCharsets.UTF_8);
} catch (final IOException e) {
throw new CpsException("Cannot read the resource file.", e.getMessage(), e);
}
}
}
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