improve GitCGIServlet

plugins/scm-git-plugin/src/main/java/sonia/scm/web/GitCGIServlet.java

@@ -14,6 +14,7 @@ import com.google.inject.Singleton;
 
 import sonia.scm.repository.GitConfig;
 import sonia.scm.repository.GitRepositoryHandler;
+import sonia.scm.util.IOUtil;
 import sonia.scm.web.cgi.AbstractCGIServlet;
 import sonia.scm.web.cgi.EnvList;
 
@@ -21,9 +22,12 @@ import sonia.scm.web.cgi.EnvList;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
 
 /**
  *
@@ -39,6 +43,16 @@ public class GitCGIServlet extends AbstractCGIServlet
   /** Field description */
   public static final String ENV_PROJECT_ROOT = "GIT_PROJECT_ROOT";
 
+  /** Field description */
+  public static final String MIMETYPE_HTML = "text/html";
+
+  /** Field description */
+  public static final String REGEX_GITHTTPBACKEND =
+    "(?x)^/git/(.*/(HEAD|info/refs|objects/(info/[^/]+|[0-9a-f]{2}/[0-9a-f]{38}|pack/pack-[0-9a-f]{40}\\.(pack|idx))|git-(upload|receive)-pack))$";
+
+  /** Field description */
+  public static final String RESOURCE_GITINDEX = "/sonia/scm/git.index.html";
+
   /** Field description */
   private static final long serialVersionUID = 9147517765161830847L;
 
@@ -90,13 +104,40 @@ public class GitCGIServlet extends AbstractCGIServlet
     return env;
   }
 
+  /**
+   * Method description
+   *
+   *
+   * @param request
+   * @param response
+   *
+   * @throws IOException
+   * @throws ServletException
+   */
+  @Override
+  protected void service(HttpServletRequest request,
+                         HttpServletResponse response)
+          throws ServletException, IOException
+  {
+    String uri = getRelativePath(request);
+
+    if (uri.matches(REGEX_GITHTTPBACKEND))
+    {
+      super.service(request, response);
+    }
+    else
+    {
+      printGitInformation(response);
+    }
+  }
+
   //~--- get methods ----------------------------------------------------------
 
   /**
    * Method description
    *
    *
-   * @param req
+   * @param request
    *
    * @return
    *
@@ -104,7 +145,7 @@ public class GitCGIServlet extends AbstractCGIServlet
    * @throws ServletException
    */
   @Override
-  protected File getCommand(HttpServletRequest req)
+  protected File getCommand(HttpServletRequest request)
           throws ServletException, IOException
   {
     GitConfig config = repositoryHandler.getConfig();
@@ -117,6 +158,53 @@ public class GitCGIServlet extends AbstractCGIServlet
     return new File(config.getGitHttpBackend());
   }
 
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param response
+   *
+   * @throws IOException
+   * @throws ServletException
+   */
+  private void printGitInformation(HttpServletResponse response)
+          throws ServletException, IOException
+  {
+    response.setContentType(MIMETYPE_HTML);
+
+    InputStream input = null;
+    OutputStream output = null;
+
+    try
+    {
+      input = GitCGIServlet.class.getResourceAsStream(RESOURCE_GITINDEX);
+      output = response.getOutputStream();
+      IOUtil.copy(input, output);
+    }
+    finally
+    {
+      IOUtil.close(input);
+      IOUtil.close(output);
+    }
+  }
+
+  //~--- get methods ----------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param request
+   *
+   * @return
+   */
+  private String getRelativePath(HttpServletRequest request)
+  {
+    return request.getRequestURI().substring(request.getContextPath().length());
+  }
+
   //~--- fields ---------------------------------------------------------------
 
   /** Field description */