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/*
* Copyright © 2018 European Support Limited
*
* 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.
*/
package org.onap.sdc.workflow.server.resolvers;
import static org.onap.sdc.workflow.api.RestParams.USER_ID_HEADER;
import java.util.Objects;
import javax.servlet.http.HttpServletRequest;
import org.onap.sdc.workflow.services.annotations.UserId;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
/**
* Resolves a user ID from an HTTP header and injects it into a parameter of type {@link String} annotated with {@link
* UserId}. The header is considered mandatory, therefore an error is returned to the client if no user ID was sent.
*
* @author evitaliy
* @since 21 Aug 2018
*/
public class UserIdResolver implements HandlerMethodArgumentResolver {
private static final String ERROR_MESSAGE = "Missing mandatory request header '" + USER_ID_HEADER + "'";
@Override
public boolean supportsParameter(MethodParameter methodParameter) {
if (!methodParameter.hasParameterAnnotation(UserId.class)) {
return false;
}
Class<?> parameterType = methodParameter.getParameterType();
if (!parameterType.equals(String.class)) {
throw new IllegalStateException("Cannot inject user ID into a parameter of type "
+ parameterType.getTypeName());
}
return true;
}
@Override
public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer,
NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory)
throws ServletRequestBindingException {
HttpServletRequest httpServletRequest = nativeWebRequest.getNativeRequest(HttpServletRequest.class);
String userHeader = Objects.requireNonNull(httpServletRequest).getHeader(USER_ID_HEADER);
if (userHeader == null) {
throw new ServletRequestBindingException(ERROR_MESSAGE);
}
return userHeader;
}
}
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