1 files changed, 81 insertions, 0 deletions
diff --git a/java/com/google/gerrit/httpd/XsrfCookieFilter.java b/java/com/google/gerrit/httpd/XsrfCookieFilter.java
new file mode 100644
index 0000000000..ff64c84298
--- /dev/null
+++ b/java/com/google/gerrit/httpd/XsrfCookieFilter.java
@@ -0,0 +1,81 @@
+// Copyright (C) 2015 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 static com.google.common.base.Strings.nullToEmpty;
+
+import com.google.gerrit.common.data.HostPageData;
+import com.google.gerrit.extensions.registration.DynamicItem;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.config.AuthConfig;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.Cookie;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@Singleton
+public class XsrfCookieFilter implements Filter {
+  private final Provider<CurrentUser> user;
+  private final DynamicItem<WebSession> session;
+  private final AuthConfig authConfig;
+
+  @Inject
+  XsrfCookieFilter(
+      Provider<CurrentUser> user, DynamicItem<WebSession> session, AuthConfig authConfig) {
+    this.user = user;
+    this.session = session;
+    this.authConfig = authConfig;
+  }
+
+  @Override
+  public void doFilter(ServletRequest req, ServletResponse rsp, FilterChain chain)
+      throws IOException, ServletException {
+    WebSession s = user.get().isIdentifiedUser() ? session.get() : null;
+    setXsrfTokenCookie((HttpServletRequest) req, (HttpServletResponse) rsp, s);
+    chain.doFilter(req, rsp);
+  }
+
+  private void setXsrfTokenCookie(
+      HttpServletRequest req, HttpServletResponse rsp, WebSession session) {
+    String v = session != null ? session.getXGerritAuth() : null;
+    Cookie c = new Cookie(HostPageData.XSRF_COOKIE_NAME, nullToEmpty(v));
+    c.setPath("/");
+    c.setSecure(authConfig.getCookieSecure() && isSecure(req));
+    c.setMaxAge(
+        v != null
+            ? -1 // Set the cookie for this browser session.
+            : 0); // Remove the cookie (expire immediately).
+    rsp.addCookie(c);
+  }
+
+  private boolean isSecure(HttpServletRequest req) {
+    return req.isSecure() || "https".equals(req.getScheme());
+  }
+
+  @Override
+  public void init(FilterConfig config) {}
+
+  @Override
+  public void destroy() {}
+}