refactor: Refactor main (#1555)

For #442.

src/web/impl/ServerSslContext.cpp

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+/*
+    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.
+*/
+//==============================================================================
+
+#include "web/impl/ServerSslContext.hpp"
+
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/ssl/context.hpp>
+#include <fmt/compile.h>
+#include <fmt/core.h>
+
+#include <expected>
+#include <fstream>
+#include <ios>
+#include <optional>
+#include <sstream>
+#include <string>
+#include <utility>
+
+namespace web::impl {
+
+namespace {
+
+std::optional<std::string>
+readFile(std::string const& path)
+{
+    std::ifstream const file(path, std::ios::in | std::ios::binary);
+    if (!file)
+        return {};
+
+    std::stringstream contents;
+    contents << file.rdbuf();
+    return std::move(contents).str();
+}
+
+}  // namespace
+
+std::expected<boost::asio::ssl::context, std::string>
+makeServerSslContext(std::string const& certFilePath, std::string const& keyFilePath)
+{
+    auto const certContent = readFile(certFilePath);
+    if (!certContent)
+        return std::unexpected{"Can't read SSL certificate: " + certFilePath};
+
+    auto const keyContent = readFile(keyFilePath);
+    if (!keyContent)
+        return std::unexpected{"Can't read SSL key: " + keyFilePath};
+
+    using namespace boost::asio;
+
+    ssl::context ctx{ssl::context::tls_server};
+    ctx.set_options(ssl::context::default_workarounds | ssl::context::no_sslv2);
+
+    try {
+        ctx.use_certificate_chain(buffer(certContent->data(), certContent->size()));
+        ctx.use_private_key(buffer(keyContent->data(), keyContent->size()), ssl::context::file_format::pem);
+    } catch (...) {
+        return std::unexpected{
+            fmt::format("Error loading SSL certificate ({}) or SSL key ({}).", certFilePath, keyFilePath)
+        };
+    }
+
+    return ctx;
+}
+
+}  // namespace web::impl