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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* 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.openecomp.sdc.common.util;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import fj.data.Either;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
public class HttpUtil {
public static Either<String, IOException> readJsonStringFromRequest(HttpServletRequest request) {
Either<String, IOException> eitherResult;
try (ByteArrayOutputStream stream = new ByteArrayOutputStream()) {
ServletInputStream reader = request.getInputStream();
int value;
while ((value = reader.read()) != -1) {
stream.write(value);
}
eitherResult = Either.left(new String(stream.toByteArray()));
} catch (IOException e) {
eitherResult = Either.right(e);
}
return eitherResult;
}
/**
* Builds an object from a JSON in the POST Body of the request.
*/
public static <T> Either<T, Exception> getObjectFromJson(HttpServletRequest request, Class<T> classOfT) {
Either<T, Exception> eitherResult;
try {
Either<String, IOException> eitherReadJson = readJsonStringFromRequest(request);
if (eitherReadJson.isLeft()) {
eitherResult = convertJsonStringToObject(eitherReadJson.left().value(), classOfT);
} else {
eitherResult = Either.right((Exception) eitherReadJson.right().value());
}
} catch (Exception e) {
eitherResult = Either.right(e);
}
return eitherResult;
}
public static <T> Either<T, Exception> convertJsonStringToObject(String sentJson, Class<T> classOfT) {
Either<T, Exception> eitherResult;
try {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
T object = gson.fromJson(sentJson, classOfT);
eitherResult = Either.left(object);
} catch (Exception e) {
eitherResult = Either.right(e);
}
return eitherResult;
}
}
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