Add HttpServletRequestUtil

service/src/main/java/org/whispersystems/textsecuregcm/util/HttpServletRequestUtil.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm.util;
+
+import javax.servlet.http.HttpServletRequest;
+
+public class HttpServletRequestUtil {
+
+  /**
+   * Returns the remote address of the request, removing bracket ("[…]") host notation from IPv6 addresses present in
+   * some implementations, notably {@link org.eclipse.jetty.server.HttpChannel}.
+   */
+  public static String getRemoteAddress(final HttpServletRequest request) {
+    final String remoteAddr = request.getRemoteAddr();
+
+    if (remoteAddr.startsWith("[")) {
+      return remoteAddr.substring(1, remoteAddr.length() - 1);
+    }
+
+    return remoteAddr;
+  }
+}