Add property to configure path separator in URLs for a gitweb service

In URLs to a gitweb service, Gerrit by default will escape slashes in
project and branch names replacing them with the corresponding hexa-
decimal encoding. Some web servers, such as Tomcat, reject hexadecimal
encoded slashes in the URL.

The gitweb service GitBlit, allows to configure an alternative path
separator character (e.g. '*'). This change introduces the property
"gitweb.pathSeparator", which allows to configure a path separator in
Gerrit matching the path separator used by the gitweb service.

Change-Id: I0c67e6264abfa156e4c513e1fad17dac141fa7d3
Signed-off-by: Adrian Goerler <adrian.goerler@sap.com>

gerrit-httpd/src/test/java/com/google/gerrit/httpd/GitWebConfigTest.java

@@ -0,0 +1,35 @@
+// Copyright (C) 2011 The Android Open Source Project
+//
+// Licensed 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 com.google.gerrit.httpd;
+
+import junit.framework.TestCase;
+
+public class GitWebConfigTest extends TestCase {
+
+  private static final String VALID_CHARACTERS = "*()";
+  private static final String SOME_INVALID_CHARACTERS = "09AZaz$-_.+!',";
+
+  public void testValidPathSeparator() {
+    for(char c : VALID_CHARACTERS.toCharArray()) {
+      assertTrue("valid character rejected: " + c, GitWebConfig.isValidPathSeparator(c));
+    }
+  }
+
+  public void testInalidPathSeparator() {
+    for(char c : SOME_INVALID_CHARACTERS.toCharArray()) {
+      assertFalse("invalid character accepted: " + c, GitWebConfig.isValidPathSeparator(c));
+    }
+  }
+}