src/game/java/net/minecraft/server/Eula.java

package net.minecraft.server;

import com.mojang.logging.LogUtils;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Properties;
import net.minecraft.SharedConstants;
import net.minecraft.util.CommonLinks;
import org.slf4j.Logger;

public class Eula {
    private static final Logger LOGGER = LogUtils.getLogger();
    private final Path file;
    private final boolean agreed;

    public Eula(Path p_135943_) {
        this.file = p_135943_;
        this.agreed = SharedConstants.IS_RUNNING_IN_IDE || this.readFile();
    }

    private boolean readFile() {
        try {
            boolean flag;
            try (InputStream inputstream = Files.newInputStream(this.file)) {
                Properties properties = new Properties();
                properties.load(inputstream);
                flag = Boolean.parseBoolean(properties.getProperty("eula", "false"));
            }

            return flag;
        } catch (Exception exception) {
            LOGGER.warn("Failed to load {}", this.file);
            this.saveDefaults();
            return false;
        }
    }

    public boolean hasAgreedToEULA() {
        return this.agreed;
    }

    private void saveDefaults() {
        if (!SharedConstants.IS_RUNNING_IN_IDE) {
            try (OutputStream outputstream = Files.newOutputStream(this.file)) {
                Properties properties = new Properties();
                properties.setProperty("eula", "false");
                properties.store(
                    outputstream, "By changing the setting below to TRUE you are indicating your agreement to our EULA (" + CommonLinks.EULA + ")."
                );
            } catch (Exception exception) {
                LOGGER.warn("Failed to save {}", this.file, exception);
            }
        }
    }
}