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test/org/apache/tomcat/websocket/TestPerMessageDeflate.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.tomcat.websocket;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import javax.websocket.Extension;
+import javax.websocket.Extension.Parameter;
+
+import org.junit.Test;
+
+public class TestPerMessageDeflate {
+
+    /*
+     * https://bz.apache.org/bugzilla/show_bug.cgi?id=61491
+     */
+    @Test
+    public void testSendEmptyMessagePartWithContextTakeover() throws IOException {
+
+        // Set up the extension using defaults
+        List<Parameter> parameters = Collections.emptyList();
+        List<List<Parameter>> preferences = new ArrayList<>();
+        preferences.add(parameters);
+
+        PerMessageDeflate perMessageDeflate = PerMessageDeflate.negotiate(preferences, true);
+        perMessageDeflate.setNext(new TesterTransformation());
+
+        ByteBuffer bb1 = ByteBuffer.wrap("A".getBytes(StandardCharsets.UTF_8));
+        MessagePart mp1 = new MessagePart(true, 0, Constants.OPCODE_TEXT, bb1, null, null, -1);
+
+        List<MessagePart> uncompressedParts1 = new ArrayList<>();
+        uncompressedParts1.add(mp1);
+        perMessageDeflate.sendMessagePart(uncompressedParts1);
+
+        ByteBuffer bb2 = ByteBuffer.wrap("".getBytes(StandardCharsets.UTF_8));
+        MessagePart mp2 = new MessagePart(true, 0, Constants.OPCODE_TEXT, bb2, null, null, -1);
+
+        List<MessagePart> uncompressedParts2 = new ArrayList<>();
+        uncompressedParts2.add(mp2);
+        perMessageDeflate.sendMessagePart(uncompressedParts2);
+    }
+
+
+    /*
+     * Minimal implementation to enable other transformations to be tested.
+     */
+    private static class TesterTransformation implements Transformation {
+        @Override
+        public boolean validateRsvBits(int i) {
+            return false;
+        }
+        @Override
+        public boolean validateRsv(int rsv, byte opCode) {
+            return false;
+        }
+        @Override
+        public void setNext(Transformation t) {
+        }
+        @Override
+        public List<MessagePart> sendMessagePart(List<MessagePart> messageParts) {
+            return messageParts;
+        }
+        @Override
+        public TransformationResult getMoreData(byte opCode, boolean fin, int rsv, ByteBuffer dest)
+                throws IOException {
+            return null;
+        }
+        @Override
+        public Extension getExtensionResponse() {
+            return null;
+        }
+        @Override
+        public void close() {
+        }
+    }
+}