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CorsFilter.java
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CorsFilter.java
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package ${package};
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.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebFilter(filterName = "CorsFilter", urlPatterns = "/*", asyncSupported = true)
public class CorsFilter implements Filter {
private static final String ACCESS_CONTROL_ALLOW_ORIGIN = "Access-Control-Allow-Origin";
private static final String ACCESS_CONTROL_ALLOW_CREDENTIALS = "Access-Control-Allow-Credentials";
private static final String ACCESS_CONTROL_ALLOW_METHODS = "Access-Control-Allow-Methods";
private static final String ACCESS_CONTROL_ALLOW_HEADERS = "Access-Control-Allow-Headers";
private static final String ORIGIN = "Origin";
private static final String ACCESS_CONTROL_REQUEST_METHOD = "Access-Control-Request-Method";
private static final String ACCESS_CONTROL_EXPOSE_HEADERS = "Access-Control-Expose-Headers";
private static final String ACCESS_CONTROL_REQUEST_HEADERS = "Access-Control-Request-Headers";
@Override
public void init(FilterConfig filterConfig) {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse) servletResponse;
String origin = request.getHeader(ORIGIN);
if (origin == null) {
chain.doFilter(servletRequest, servletResponse);
} else {
String requestMethods = request.getHeader(ACCESS_CONTROL_REQUEST_METHOD);
if (requestMethods != null) {
response.setHeader(ACCESS_CONTROL_ALLOW_METHODS, requestMethods);
}
String allowHeaders = request.getHeader(ACCESS_CONTROL_REQUEST_HEADERS);
if (allowHeaders != null) {
response.setHeader(ACCESS_CONTROL_ALLOW_HEADERS, allowHeaders);
}
response.setHeader(ACCESS_CONTROL_ALLOW_ORIGIN, origin);
response.setHeader(ACCESS_CONTROL_ALLOW_CREDENTIALS, "true");
response.setHeader(ACCESS_CONTROL_EXPOSE_HEADERS, "Content-Disposition");
if (!"OPTIONS".equalsIgnoreCase(request.getMethod())) {
chain.doFilter(servletRequest, servletResponse);
} else {
response.flushBuffer();
}
}
}
@Override
public void destroy() {
}
}