create new key generator for shorter repository ids

scm-webapp/src/main/java/sonia/scm/security/DefaultKeyGenerator.java

@@ -0,0 +1,94 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. 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. 3. Neither the name of SCM-Manager;
+ * 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 REGENTS 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.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.security;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import com.google.inject.Singleton;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.util.Random;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+@Singleton
+public class DefaultKeyGenerator implements KeyGenerator
+{
+
+  /**
+   * the logger for DefaultKeyGenerator
+   */
+  private static final Logger logger =
+    LoggerFactory.getLogger(DefaultKeyGenerator.class);
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @return
+   */
+  @Override
+  public String createKey()
+  {
+    StringBuilder buffer = new StringBuilder();
+
+    buffer.append(Long.toHexString(System.currentTimeMillis()));
+    buffer.append(Long.toHexString(sessionKey.incrementAndGet()));
+    buffer.append(Integer.toHexString(random.nextInt(999)));
+
+    String key = buffer.toString();
+
+    if (logger.isTraceEnabled())
+    {
+      logger.trace("create new key {}", key);
+    }
+
+    return key;
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  private AtomicLong sessionKey = new AtomicLong();
+
+  /** Field description */
+  private Random random = new Random();
+}