Better handle of File reading / Input Streams

src/main/java/io/kamax/mxisd/util/FileUtil.java

@@ -0,0 +1,57 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2019 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.util;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang3.StringUtils;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import java.util.Objects;
+
+public class FileUtil {
+
+    public static String load(String loc) throws IOException {
+        URI uri = URI.create(loc);
+
+        InputStream is;
+        if (StringUtils.equals("classpath", uri.getScheme())) {
+            String resource = uri.getSchemeSpecificPart();
+            is = FileUtil.class.getResourceAsStream(resource);
+            if (Objects.isNull(is)) {
+                throw new FileNotFoundException("No classpath resource: " + resource);
+            }
+        } else {
+            is = new FileInputStream(loc);
+        }
+
+        try {
+            return IOUtils.toString(is, StandardCharsets.UTF_8);
+        } finally {
+            is.close();
+        }
+    }
+
+}