Start structural port from Spring Boot to Undertow

src/main/java/io/kamax/mxisd/config/YamlConfigLoader.java

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+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.config;
+
+import io.kamax.matrix.json.GsonUtil;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.Constructor;
+import org.yaml.snakeyaml.representer.Representer;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+
+public class YamlConfigLoader {
+
+    public static MxisdConfig loadFromFile(String path) throws IOException {
+        Representer rep = new Representer();
+        rep.getPropertyUtils().setAllowReadOnlyProperties(true);
+        rep.getPropertyUtils().setSkipMissingProperties(true);
+        Yaml yaml = new Yaml(new Constructor(MxisdConfig.class), rep);
+        Object o = yaml.load(new FileInputStream(path));
+        return GsonUtil.get().fromJson(GsonUtil.get().toJson(o), MxisdConfig.class);
+    }
+
+}