1 files changed, 42 insertions, 0 deletions
diff --git a/gerrit-openid/src/main/java/com/google/gerrit/httpd/auth/openid/XrdsFilter.java b/gerrit-openid/src/main/java/com/google/gerrit/httpd/auth/openid/XrdsFilter.java
new file mode 100644
index 0000000000..92230f687d
--- /dev/null
+++ b/gerrit-openid/src/main/java/com/google/gerrit/httpd/auth/openid/XrdsFilter.java
@@ -0,0 +1,42 @@
+package com.google.gerrit.httpd.auth.openid;
+
+import com.google.gerrit.server.config.CanonicalWebUrl;
+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.HttpServletResponse;
+
+@Singleton
+class XrdsFilter implements Filter {
+  private final Provider<String> url;
+
+  @Inject
+  XrdsFilter(@CanonicalWebUrl final Provider<String> url) {
+    this.url = url;
+  }
+
+  @Override
+  public void doFilter(ServletRequest request, ServletResponse response,
+      FilterChain chain) throws IOException, ServletException {
+    HttpServletResponse rsp = (HttpServletResponse) response;
+    rsp.setHeader("X-XRDS-Location", url.get() + XrdsServlet.LOCATION);
+    chain.doFilter(request, response);
+  }
+
+  @Override
+  public void init(FilterConfig config) {
+  }
+
+  @Override
+  public void destroy() {
+  }
+}