Fixed Issue 141 - Request Parameter with empty value being stripped

Fixed an issue that caused request parameters with no value (e.g. ?wsdl
or ?wsdl=) to not be included in the result of getQueryParams()

zuul-core/src/main/java/com/netflix/zuul/util/HTTPRequestUtils.java

@@ -15,8 +15,10 @@
  */
 package com.netflix.zuul.util;
 
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.when;
 
 import java.net.URLDecoder;
 import java.util.ArrayList;
@@ -30,7 +32,10 @@
 
 import javax.servlet.http.HttpServletRequest;
 
+import org.junit.Before;
 import org.junit.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
 
 import com.netflix.zuul.context.RequestContext;
 
@@ -163,7 +168,7 @@ public Map<String, List<String>> getQueryParams() {
         while (st.hasMoreTokens()) {
             String s = st.nextToken();
             i = s.indexOf("=");
-            if (i > 0 && s.length() > i + 1) {
+            if (i > 0 && s.length() >= i + 1) {
                 String name = s.substring(0, i);
                 String value = s.substring(i + 1);
 
@@ -184,6 +189,24 @@ public Map<String, List<String>> getQueryParams() {
 
                 valueList.add(value);
             }
+            else if (i == -1)
+            {
+                String name=s;
+                String value="";
+                try {
+                    name = URLDecoder.decode(name, "UTF-8");
+                } catch (Exception e) {
+                }
+
+                List<String> valueList = qp.get(name);
+                if (valueList == null) {
+                    valueList = new LinkedList<String>();
+                    qp.put(name, valueList);
+                }
+
+                valueList.add(value);
+
+            }
         }
 
         RequestContext.getCurrentContext().setRequestQueryParams(qp);
@@ -222,6 +245,16 @@ public boolean isGzipped(String contentEncoding) {
 
     public static class UnitTest {
 
+        @Mock
+        private RequestContext mockContext;
+        @Mock
+        private HttpServletRequest request;
+
+        @Before
+        public void before() {
+            MockitoAnnotations.initMocks(this);
+        }
+
         @Test
         public void detectsGzip() {
             assertTrue(HTTPRequestUtils.getInstance().isGzipped("gzip"));
@@ -236,6 +269,36 @@ public void detectsNonGzip() {
         public void detectsGzipAmongOtherEncodings() {
             assertTrue(HTTPRequestUtils.getInstance().isGzipped("gzip, deflate"));
         }
+
+        @Test
+        public void testGetQueryParams() {
+            Map<String, List<String>> qp;
+            LinkedList<String> blankValue = new LinkedList<String>();
+            blankValue.add("");
+
+            RequestContext.testSetCurrentContext(mockContext);
+            when(mockContext.getRequestQueryParams()).thenReturn(null);
+            when(mockContext.getRequest()).thenReturn(request);
+            when(request.getQueryString()).thenReturn("wsdl");
+
+            qp = HTTPRequestUtils.getInstance().getQueryParams();
+            assertEquals(blankValue, qp.get("wsdl"));
+
+            when(request.getQueryString()).thenReturn("wsdl=");
+
+            qp = HTTPRequestUtils.getInstance().getQueryParams();
+            assertEquals(blankValue, qp.get("wsdl"));
+
+            when(request.getQueryString()).thenReturn("a=123&b=234&b=345&c&d=");
+
+            qp = HTTPRequestUtils.getInstance().getQueryParams();
+            assertEquals("123", qp.get("a").get(0));
+            // Not sure that order is supposed to be guaranteed here
+            assertEquals("234", qp.get("b").get(0)); 
+            assertEquals("345", qp.get("b").get(1));
+            assertEquals(blankValue, qp.get("c"));
+            assertEquals(blankValue, qp.get("d"));
+        }
     }
 
 }