1 files changed, 66 insertions, 0 deletions
diff --git a/cps-rest/src/main/java/org/onap/cps/rest/utils/MultipartFileUtil.java b/cps-rest/src/main/java/org/onap/cps/rest/utils/MultipartFileUtil.java
new file mode 100644
index 000000000..0c527a556
--- /dev/null
+++ b/cps-rest/src/main/java/org/onap/cps/rest/utils/MultipartFileUtil.java
@@ -0,0 +1,66 @@
+/*
+ *  ============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 org.opendaylight.yangtools.yang.common.YangConstants.RFC6020_YANG_FILE_EXTENSION;
+
+import com.google.common.collect.ImmutableMap;
+import java.io.IOException;
+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 = multipartFile.getOriginalFilename();
+        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());
+        } catch (final IOException e) {
+            throw new CpsException("Cannot read the resource file.", e.getMessage(), e);
+        }
+    }
+
+}