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package org.onap.vid.controller.filter;
import com.google.common.collect.ImmutableList;
import org.apache.commons.lang3.StringUtils;
import org.openecomp.portalsdk.core.logging.logic.EELFLoggerDelegate;
import org.springframework.web.filter.GenericFilterBean;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.UUID;
import static org.openecomp.portalsdk.core.util.SystemProperties.ECOMP_REQUEST_ID;
@WebFilter(urlPatterns = "/*")
public class PromiseEcompRequestIdFilter extends GenericFilterBean {
private final static EELFLoggerDelegate LOGGER = EELFLoggerDelegate.getLogger(PromiseEcompRequestIdFilter.class);
private final static String REQUEST_ID_RESPONSE_HEADER = ECOMP_REQUEST_ID + "-echo";
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
if (request instanceof HttpServletRequest) {
request = wrapIfNeeded(request);
if (response instanceof HttpServletResponse) {
final String actualRequestId = ((HttpServletRequest) request).getHeader(ECOMP_REQUEST_ID);
((HttpServletResponse) response).addHeader(REQUEST_ID_RESPONSE_HEADER, actualRequestId);
}
}
chain.doFilter(request, response);
}
public static ServletRequest wrapIfNeeded(ServletRequest request) {
final HttpServletRequest httpRequest = (HttpServletRequest) request;
final String originalRequestId = httpRequest.getHeader(ECOMP_REQUEST_ID);
if (StringUtils.isEmpty(originalRequestId)) {
request = new PromiseEcompRequestIdRequestWrapper(httpRequest);
}
return request;
}
private static class PromiseEcompRequestIdRequestWrapper extends HttpServletRequestWrapper {
private final UUID requestId;
PromiseEcompRequestIdRequestWrapper(HttpServletRequest request) {
super(request);
requestId = UUID.randomUUID();
}
@Override
public String getHeader(String name) {
return isRequestIdHeaderName(name) ?
requestId.toString() : super.getHeader(name);
}
@Override
public Enumeration<String> getHeaders(String name) {
if (isRequestIdHeaderName(name)) {
return Collections.enumeration(Collections.singleton(requestId.toString()));
} else {
return super.getHeaders(name);
}
}
@Override
public Enumeration<String> getHeaderNames() {
return Collections.enumeration(ImmutableList.<String>builder()
.add(ECOMP_REQUEST_ID)
.addAll(Collections.list(super.getHeaderNames()))
.build());
}
private boolean isRequestIdHeaderName(String name) {
return ECOMP_REQUEST_ID.equalsIgnoreCase(name);
}
}
}
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