#961: Give each user its own schema for the lessons

This way we can reset a lesson using the database for each user and not for all users at once.
Also solves the issue that when someone solves the lesson it is solved for all users on the same WebGoat instance

webgoat-container/src/main/java/org/owasp/webgoat/LessonDataSource.java

@@ -0,0 +1,70 @@
+package org.owasp.webgoat;
+
+import org.owasp.webgoat.lessons.LessonConnectionInvocationHandler;
+import org.springframework.jdbc.datasource.ConnectionProxy;
+
+import javax.sql.DataSource;
+import java.io.PrintWriter;
+import java.lang.reflect.Proxy;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.util.logging.Logger;
+
+public class LessonDataSource implements DataSource {
+
+    private final DataSource originalDataSource;
+
+    public LessonDataSource(DataSource dataSource) {
+        this.originalDataSource = dataSource;
+    }
+
+    @Override
+    public Connection getConnection() throws SQLException {
+        var targetConnection = originalDataSource.getConnection();
+        return (Connection) Proxy.newProxyInstance(
+                ConnectionProxy.class.getClassLoader(),
+                new Class[]{ConnectionProxy.class},
+                new LessonConnectionInvocationHandler(targetConnection));
+    }
+
+    @Override
+    public Connection getConnection(String username, String password) throws SQLException {
+        return originalDataSource.getConnection(username, password);
+    }
+
+    @Override
+    public PrintWriter getLogWriter() throws SQLException {
+        return originalDataSource.getLogWriter();
+    }
+
+    @Override
+    public void setLogWriter(PrintWriter out) throws SQLException {
+        originalDataSource.setLogWriter(out);
+    }
+
+    @Override
+    public void setLoginTimeout(int seconds) throws SQLException {
+        originalDataSource.setLoginTimeout(seconds);
+    }
+
+    @Override
+    public int getLoginTimeout() throws SQLException {
+        return originalDataSource.getLoginTimeout();
+    }
+
+    @Override
+    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
+        return originalDataSource.getParentLogger();
+    }
+
+    @Override
+    public <T> T unwrap(Class<T> clazz) throws SQLException {
+        return originalDataSource.unwrap(clazz);
+    }
+
+    @Override
+    public boolean isWrapperFor(Class<?> clazz) throws SQLException {
+        return originalDataSource.isWrapperFor(clazz);
+    }
+}