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package org.onap.sdc.workflow.server.filters;

import static org.onap.sdc.workflow.api.RestConstants.USER_ID_HEADER_PARAM;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.onap.sdc.workflow.server.config.ZusammenConfig;
import org.openecomp.sdc.common.session.SessionContextProvider;
import org.openecomp.sdc.common.session.SessionContextProviderFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class SessionContextFilter implements Filter {

    private ZusammenConfig zusammenConfig;

    @Autowired
    public SessionContextFilter(ZusammenConfig zusammenConfig) {
        this.zusammenConfig = zusammenConfig;
    }

    @Override
    public void init(FilterConfig filterConfig) {
        // not implemented
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        SessionContextProvider contextProvider = SessionContextProviderFactory.getInstance().createInterface();

        try {
            if (servletRequest instanceof HttpServletRequest) {

                contextProvider.create(getUser(servletRequest), getTenant());
            }

            filterChain.doFilter(servletRequest, servletResponse);
        } finally {
            contextProvider.close();
        }
    }

    @Override
    public void destroy() {
        // not implemented
    }

    private String getUser(ServletRequest servletRequest) {
        return ((HttpServletRequest) servletRequest).getHeader(USER_ID_HEADER_PARAM);
    }

    private String getTenant() {
        return zusammenConfig.getTenant();
    }
}