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JSONPRequestFilter.java
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JSONPRequestFilter.java
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package fr.astek.gex.server.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
/**
* @author sdaclin
* Adapted from http://solutionsfit.com/blog/2010/04/18/serving-up-jsonp-from-your-jax-rs-web-services/
*/
public class JSONPRequestFilter implements Filter {
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
if (!(request instanceof HttpServletRequest)) {
throw new ServletException("This filter can only process HttpServletRequest requests");
}
HttpServletRequest httpRequest = (HttpServletRequest) request;
if (isJSONPRequest(httpRequest)) {
ServletOutputStream out = response.getOutputStream();
out.println(getCallbackMethod(httpRequest) + "(");
chain.doFilter(request, response);
out.println(");");
response.setContentType("text/javascript");
} else {
chain.doFilter(request, response);
}
}
private String getCallbackMethod(HttpServletRequest httpRequest) {
return httpRequest.getParameter("jsonp");
}
private boolean isJSONPRequest(HttpServletRequest httpRequest) {
String callbackMethod = getCallbackMethod(httpRequest);
return (callbackMethod != null && callbackMethod.length() > 0);
}
public void init(FilterConfig fc) throws ServletException {
//throw new UnsupportedOperationException("Not supported yet.");
}
public void destroy() {
//throw new UnsupportedOperationException("Not supported yet.");
}
}