#0 enh - Gzipping main bundle on the fly

rsanchez

2017-06-08 d00705286218a5f501ab18bc8a50ec22f043b8b7

 securis/src/main/java/net/curisit/securis/GzipFilter.java
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@@ -10,13 +10,16 @@
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 import javax.servlet.ServletRequest;
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 import javax.servlet.ServletResponse;
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 import javax.servlet.annotation.WebFilter;
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+import javax.servlet.http.HttpServletRequest;
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 import javax.servlet.http.HttpServletResponse;
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 import org.apache.logging.log4j.LogManager;
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 import org.apache.logging.log4j.Logger;
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+import net.curisit.securis.utils.GZipServletResponseWrapper;
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+
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 @ApplicationScoped
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-@WebFilter(urlPatterns = "*.gz")
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+@WebFilter(urlPatterns = "*.js")
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 public class GzipFilter implements Filter {
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 	@SuppressWarnings("unused")
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@@ -27,12 +30,24 @@
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 	}
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 	@Override
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-	public void doFilter(ServletRequest sreq, ServletResponse sres, FilterChain fc) throws IOException, ServletException {
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-		//HttpServletRequest req = (HttpServletRequest) sreq;
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-		HttpServletResponse res = (HttpServletResponse) sres;
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-		res.addHeader("Content-Encoding", "gzip");
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-		// LOG.info("Content served as gzip: {}", req.getRequestURI());
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-		fc.doFilter(sreq, sres);
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+	public void doFilter(ServletRequest sreq, ServletResponse sres, FilterChain chain) throws IOException, ServletException {
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+		HttpServletRequest httpRequest = (HttpServletRequest) sreq;
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+		HttpServletResponse httpResponse = (HttpServletResponse) sres;
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+
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+		if (acceptsGZipEncoding(httpRequest)) {
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+			httpResponse.addHeader("Content-Encoding", "gzip");
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+			GZipServletResponseWrapper gzipResponse = new GZipServletResponseWrapper(httpResponse);
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+			chain.doFilter(sreq, gzipResponse);
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+			gzipResponse.close();
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+		} else {
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+			chain.doFilter(sreq, sres);
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+		}
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+	}
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+
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+	private boolean acceptsGZipEncoding(HttpServletRequest httpRequest) {
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+		String acceptEncoding = httpRequest.getHeader("Accept-Encoding");
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+
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+		return acceptEncoding != null && acceptEncoding.indexOf("gzip") != -1;
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 	}
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 	@Override