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------------------------------------------------------------
revno: 20525
committer: Lars Helge Overland <larshelge@xxxxxxxxx>
branch nick: dhis2
timestamp: Tue 2015-10-06 16:43:34 +0200
message:
  Added ExludableShallowEtagHeaderFilter
added:
  dhis-2/dhis-web/dhis-web-commons/src/main/java/org/hisp/dhis/servlet/filter/ExludableShallowEtagHeaderFilter.java


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=== added file 'dhis-2/dhis-web/dhis-web-commons/src/main/java/org/hisp/dhis/servlet/filter/ExludableShallowEtagHeaderFilter.java'
--- dhis-2/dhis-web/dhis-web-commons/src/main/java/org/hisp/dhis/servlet/filter/ExludableShallowEtagHeaderFilter.java	1970-01-01 00:00:00 +0000
+++ dhis-2/dhis-web/dhis-web-commons/src/main/java/org/hisp/dhis/servlet/filter/ExludableShallowEtagHeaderFilter.java	2015-10-06 14:43:34 +0000
@@ -0,0 +1,70 @@
+package org.hisp.dhis.servlet.filter;
+
+/*
+ * Copyright (c) 2004-2015, University of Oslo
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * Neither the name of the HISP project nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import java.io.IOException;
+import java.util.regex.Pattern;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.springframework.web.filter.ShallowEtagHeaderFilter;
+
+/**
+ * Subclass of Spring ShallowEtagHeaderFilter which ignores specific URL patterns.
+ * 
+ * @author Lars Helge Overland
+ */
+public class ExludableShallowEtagHeaderFilter
+    extends ShallowEtagHeaderFilter
+{
+    private static final String EXLUDE_REGEX = "/api/dataValueSets|/api/dataValues|/api/fileResources";
+    
+    @Override
+    protected void doFilterInternal( HttpServletRequest request, HttpServletResponse response, FilterChain filterChain )
+        throws ServletException, IOException
+    {
+        String uri = request.getRequestURI();
+        
+        if ( Pattern.matches( EXLUDE_REGEX, uri ) )
+        {
+            // Proceed without invoking this filter
+            
+            filterChain.doFilter( request, response ); 
+        }
+        else
+        {
+            // Do invoke this filter
+            
+            super.doFilterInternal( request, response, filterChain );
+        }
+    }
+}