Rename headers to .hpp (#1154)

Fixes #1153

src/rpc/common/HandlerProvider.hpp

@@ -0,0 +1,46 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2024, 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 "rpc/common/AnyHandler.hpp"
+
+#include <optional>
+#include <string>
+
+namespace rpc {
+
+/**
+ * @brief Interface for the provider of RPC handlers.
+ */
+class HandlerProvider {
+public:
+    virtual ~HandlerProvider() = default;
+
+    virtual bool
+    contains(std::string const& method) const = 0;
+
+    virtual std::optional<AnyHandler>
+    getHandler(std::string const& command) const = 0;
+
+    virtual bool
+    isClioOnly(std::string const& command) const = 0;
+};
+
+}  // namespace rpc