Fix loading failures of JDBC drivers for SQL-based Identity stores

src/main/java/io/kamax/mxisd/backend/sql/BuiltInDriverLoader.java

@@ -0,0 +1,55 @@
+/*
+ * 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.backend.sql;
+
+import org.apache.commons.lang3.StringUtils;
+
+public class BuiltInDriverLoader implements DriverLoader {
+
+    @Override
+    public void accept(String s) {
+        String className = null;
+        if (StringUtils.equals("sqlite", s)) {
+            className = "org.sqlite.JDBC";
+        }
+
+        if (StringUtils.equals("postgresql", s)) {
+            className = "org.postgresql.Driver";
+        }
+
+        if (StringUtils.equals("mariadb", s)) {
+            className = "org.mariadb.jdbc.Driver";
+        }
+
+        if (StringUtils.equals("mysql", s)) {
+            className = "org.mariadb.jdbc.Driver";
+        }
+
+        if (StringUtils.isNotEmpty(className)) {
+            try {
+                Class.forName(className);
+            } catch (ClassNotFoundException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+}