Copy acceptsGzipEncoding method from gwtjsonrpc

This is a tiny utility that we don't need to bring in a whole external
dependency for.

Change-Id: I3d5d4e9f8d9272861c890ad59fca1662b05d608c

java/com/google/gerrit/httpd/auth/container/HttpAuthFilter.java

@@ -28,7 +28,7 @@ import com.google.gerrit.httpd.WebSession;
 import com.google.gerrit.server.account.externalids.ExternalId;
 import com.google.gerrit.server.config.AuthConfig;
 import com.google.gerrit.util.http.CacheHeaders;
-import com.google.gwtjsonrpc.server.RPCServletUtils;
+import com.google.gerrit.util.http.RequestUtil;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 import java.io.FileNotFoundException;
@@ -97,7 +97,7 @@ class HttpAuthFilter implements Filter {
       final HttpServletRequest req = (HttpServletRequest) request;
       final HttpServletResponse rsp = (HttpServletResponse) response;
       final byte[] tosend;
-      if (RPCServletUtils.acceptsGzipEncoding(req)) {
+      if (RequestUtil.acceptsGzipEncoding(req)) {
         rsp.setHeader("Content-Encoding", "gzip");
         tosend = signInGzip;
       } else {

java/com/google/gerrit/httpd/gitweb/GitwebCssServlet.java

@@ -21,7 +21,7 @@ import com.google.gerrit.httpd.HtmlDomUtil;
 import com.google.gerrit.server.config.GitwebCgiConfig;
 import com.google.gerrit.server.config.SitePaths;
 import com.google.gerrit.util.http.CacheHeaders;
-import com.google.gwtjsonrpc.server.RPCServletUtils;
+import com.google.gerrit.util.http.RequestUtil;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 import java.io.IOException;
@@ -86,7 +86,7 @@ abstract class GitwebCssServlet extends HttpServlet {
       rsp.setContentType("text/css");
       rsp.setCharacterEncoding(UTF_8.name());
       final byte[] toSend;
-      if (RPCServletUtils.acceptsGzipEncoding(req)) {
+      if (RequestUtil.acceptsGzipEncoding(req)) {
         rsp.setHeader("Content-Encoding", "gzip");
         toSend = gz_css;
       } else {

java/com/google/gerrit/httpd/raw/LegacyGerritServlet.java

@@ -16,7 +16,7 @@ package com.google.gerrit.httpd.raw;
 
 import com.google.gerrit.httpd.HtmlDomUtil;
 import com.google.gerrit.util.http.CacheHeaders;
-import com.google.gwtjsonrpc.server.RPCServletUtils;
+import com.google.gerrit.util.http.RequestUtil;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 import java.io.FileNotFoundException;
@@ -55,7 +55,7 @@ public class LegacyGerritServlet extends HttpServlet {
   @Override
   protected void doGet(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
     final byte[] tosend;
-    if (RPCServletUtils.acceptsGzipEncoding(req)) {
+    if (RequestUtil.acceptsGzipEncoding(req)) {
       rsp.setHeader("Content-Encoding", "gzip");
       tosend = compressed;
     } else {

java/com/google/gerrit/httpd/raw/ResourceServlet.java

@@ -36,7 +36,7 @@ import com.google.gerrit.common.Nullable;
 import com.google.gerrit.httpd.HtmlDomUtil;
 import com.google.gerrit.server.UsedAt;
 import com.google.gerrit.util.http.CacheHeaders;
-import com.google.gwtjsonrpc.server.RPCServletUtils;
+import com.google.gerrit.util.http.RequestUtil;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.nio.file.Files;
@@ -182,7 +182,7 @@ public abstract class ResourceServlet extends HttpServlet {
     }
 
     byte[] tosend = r.raw;
-    if (!r.contentType.equals(JS) && RPCServletUtils.acceptsGzipEncoding(req)) {
+    if (!r.contentType.equals(JS) && RequestUtil.acceptsGzipEncoding(req)) {
       byte[] gz = HtmlDomUtil.compress(tosend);
       if ((gz.length + 24) < tosend.length) {
         rsp.setHeader(CONTENT_ENCODING, "gzip");
@@ -267,7 +267,7 @@ public abstract class ResourceServlet extends HttpServlet {
 
     OutputStream out = rsp.getOutputStream();
     GZIPOutputStream gz = null;
-    if (RPCServletUtils.acceptsGzipEncoding(req)) {
+    if (RequestUtil.acceptsGzipEncoding(req)) {
       rsp.setHeader(CONTENT_ENCODING, "gzip");
       gz = new GZIPOutputStream(out);
       out = gz;

java/com/google/gerrit/httpd/raw/ToolServlet.java

@@ -26,7 +26,7 @@ import static org.eclipse.jgit.util.HttpSupport.HDR_PRAGMA;
 import com.google.gerrit.common.Version;
 import com.google.gerrit.server.tools.ToolsCatalog;
 import com.google.gerrit.server.tools.ToolsCatalog.Entry;
-import com.google.gwtjsonrpc.server.RPCServletUtils;
+import com.google.gerrit.util.http.RequestUtil;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 import java.io.IOException;
@@ -130,7 +130,7 @@ public class ToolServlet extends HttpServlet {
     body.appendChild(footer);
 
     byte[] tosend = toUTF8(page);
-    if (RPCServletUtils.acceptsGzipEncoding(req)) {
+    if (RequestUtil.acceptsGzipEncoding(req)) {
       rsp.setHeader("Content-Encoding", "gzip");
       tosend = compress(tosend);
     }

java/com/google/gerrit/util/http/RequestUtil.java

@@ -89,5 +89,10 @@ public class RequestUtil {
     return result.toString();
   }
 
+  public static boolean acceptsGzipEncoding(HttpServletRequest request) {
+    String accepts = request.getHeader("Accept-Encoding");
+    return accepts != null && accepts.indexOf("gzip") != -1;
+  }
+
   private RequestUtil() {}
 }