Fix race condition and ub (#631)

src/rpc/common/Types.h

@@ -22,6 +22,8 @@
 #include <rpc/Errors.h>
 #include <util/Expected.h>
 
+#include <ripple/basics/base_uint.h>
+
 #include <boost/asio/spawn.hpp>
 #include <boost/json/value.hpp>
 
@@ -71,6 +73,26 @@ struct Context
     std::string clientIp;
 };
 
+using Result = std::variant<Status, boost::json::object>;
+
+struct AccountCursor
+{
+    ripple::uint256 index;
+    std::uint32_t hint;
+
+    std::string
+    toString() const
+    {
+        return ripple::strHex(index) + "," + std::to_string(hint);
+    }
+
+    bool
+    isNonZero() const
+    {
+        return index.isNonZero() || hint != 0;
+    }
+};
+
 class AnyHandler;
 
 class HandlerProvider

src/rpc/common/impl/AdminVerificationStrategy.h

@@ -0,0 +1,42 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2023, the clio developers.
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#pragma once
+
+#include <string_view>
+
+namespace RPC::detail {
+
+class IPAdminVerificationStrategy final
+{
+public:
+    /**
+     * @brief Checks whether request is from a host that is considered authorized as admin.
+     *
+     * @param ip The ip addr of the client
+     * @return true if authorized; false otherwise
+     */
+    bool
+    isAdmin(std::string_view ip) const
+    {
+        return ip == "127.0.0.1";
+    }
+};
+
+}  // namespace RPC::detail