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java/org/apache/catalina/util/StandardSessionIdGenerator.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.catalina.util;
+
+public class StandardSessionIdGenerator extends SessionIdGeneratorBase {
+
+    @Override
+    public String generateSessionId(String route) {
+
+        byte random[] = new byte[16];
+        int sessionIdLength = getSessionIdLength();
+
+        // Render the result as a String of hexadecimal digits
+        // Start with enough space for sessionIdLength and medium route size
+        StringBuilder buffer = new StringBuilder(2 * sessionIdLength + 20);
+
+        int resultLenBytes = 0;
+
+        while (resultLenBytes < sessionIdLength) {
+            getRandomBytes(random);
+            for (int j = 0;
+            j < random.length && resultLenBytes < sessionIdLength;
+            j++) {
+                byte b1 = (byte) ((random[j] & 0xf0) >> 4);
+                byte b2 = (byte) (random[j] & 0x0f);
+                if (b1 < 10)
+                    buffer.append((char) ('0' + b1));
+                else
+                    buffer.append((char) ('A' + (b1 - 10)));
+                if (b2 < 10)
+                    buffer.append((char) ('0' + b2));
+                else
+                    buffer.append((char) ('A' + (b2 - 10)));
+                resultLenBytes++;
+            }
+        }
+
+        if (route != null && route.length() > 0) {
+            buffer.append('.').append(route);
+        } else {
+            String jvmRoute = getJvmRoute();
+            if (jvmRoute != null && jvmRoute.length() > 0) {
+                buffer.append('.').append(jvmRoute);
+            }
+        }
+
+        return buffer.toString();
+    }
+}