adds namespace strategies for current year, repository type, username and custom

scm-webapp/src/main/java/sonia/scm/repository/CustomNamespaceStrategy.java

@@ -0,0 +1,20 @@
+package sonia.scm.repository;
+
+import sonia.scm.plugin.Extension;
+import sonia.scm.util.ValidationUtil;
+
+import static sonia.scm.ScmConstraintViolationException.Builder.doThrow;
+
+@Extension
+public class CustomNamespaceStrategy implements NamespaceStrategy {
+  @Override
+  public String createNamespace(Repository repository) {
+    String namespace = repository.getNamespace();
+
+    doThrow()
+      .violation("invalid namespace", "namespace")
+      .when(!ValidationUtil.isRepositoryNameValid(namespace));
+
+    return namespace;
+  }
+}