content: /*
   * LibertyBans
   * Copyright © 2022 Anand Beh
   *
   * LibertyBans 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.
   *
   * LibertyBans 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 LibertyBans. If not, see <https://www.gnu.org/licenses/>
   * and navigate to version 3 of the GNU Affero General Public License.
   */
  
  package space.arim.libertybans.core.alts;
  
  import jakarta.inject.Inject;
  import net.kyori.adventure.text.Component;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.jooq.DSLContext;
  import space.arim.libertybans.api.NetworkAddress;
  import space.arim.libertybans.core.config.Configs;
  
  import java.time.Instant;
  
  import static space.arim.libertybans.core.schema.tables.Addresses.ADDRESSES;
  
  public final class ConnectionLimiter {
  
  	private final Configs configs;
  
  	@Inject
  	public ConnectionLimiter(Configs configs) {
  		this.configs = configs;
  	}
  
  	public @Nullable Component hasExceededLimit(DSLContext context, NetworkAddress address,
  												Instant currentTime) {
  		var config = configs.getMainConfig().enforcement().connectionLimiter();
  		if (config.enable()) {
  			Instant timeBeforeDuration = currentTime.minusSeconds(config.durationSeconds());
  			int count = context
  					.selectCount()
  					.from(ADDRESSES)
  					.where(ADDRESSES.ADDRESS.eq(address))
  					.and(ADDRESSES.UPDATED.greaterOrEqual(timeBeforeDuration))
  					.fetchSingle()
  					.value1();
  			if (count > config.limit()) {
  				return config.message();
  			}
  		}
  		return null;
  	}
  }
  