1 files changed, 74 insertions, 0 deletions
diff --git a/java/com/google/gerrit/httpd/raw/LegacyGerritServlet.java b/java/com/google/gerrit/httpd/raw/LegacyGerritServlet.java
new file mode 100644
index 0000000000..7bc56a6fe3
--- /dev/null
+++ b/java/com/google/gerrit/httpd/raw/LegacyGerritServlet.java
@@ -0,0 +1,74 @@
+// Copyright (C) 2009 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.raw;
+
+import com.google.gerrit.httpd.HtmlDomUtil;
+import com.google.gerrit.util.http.CacheHeaders;
+import com.google.gwtjsonrpc.server.RPCServletUtils;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.OutputStream;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * Redirects from {@code /Gerrit#foo} to {@code /#foo} in JavaScript.
+ *
+ * <p>This redirect exists to convert the older /Gerrit URL into the more modern URL format which
+ * does not use a servlet name for the host page. We cannot do the redirect here in the server side,
+ * as it would lose any history token that appears in the URL. Instead we send an HTML page which
+ * instructs the browser to replace the URL, but preserve the history token.
+ */
+@Singleton
+public class LegacyGerritServlet extends HttpServlet {
+  private static final long serialVersionUID = 1L;
+
+  private final byte[] raw;
+  private final byte[] compressed;
+
+  @Inject
+  LegacyGerritServlet() throws IOException {
+    final String pageName = "LegacyGerrit.html";
+    final String doc = HtmlDomUtil.readFile(getClass(), pageName);
+    if (doc == null) {
+      throw new FileNotFoundException("No " + pageName + " in webapp");
+    }
+
+    raw = doc.getBytes(HtmlDomUtil.ENC);
+    compressed = HtmlDomUtil.compress(raw);
+  }
+
+  @Override
+  protected void doGet(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
+    final byte[] tosend;
+    if (RPCServletUtils.acceptsGzipEncoding(req)) {
+      rsp.setHeader("Content-Encoding", "gzip");
+      tosend = compressed;
+    } else {
+      tosend = raw;
+    }
+
+    CacheHeaders.setNotCacheable(rsp);
+    rsp.setContentType("text/html");
+    rsp.setCharacterEncoding(HtmlDomUtil.ENC.name());
+    rsp.setContentLength(tosend.length);
+    try (OutputStream out = rsp.getOutputStream()) {
+      out.write(tosend);
+    }
+  }
+}