Code/net/minecraft/world/level/validation/PathAllowList.java

package net.minecraft.world.level.validation;

import com.mojang.logging.LogUtils;
import java.io.BufferedReader;
import java.nio.file.FileSystem;
import java.nio.file.Path;
import java.nio.file.PathMatcher;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import org.slf4j.Logger;

public class PathAllowList implements PathMatcher {
    private static final Logger LOGGER = LogUtils.getLogger();
    private static final String COMMENT_PREFIX = "#";
    private final List<PathAllowList.ConfigEntry> entries;
    private final Map<String, PathMatcher> compiledPaths = new ConcurrentHashMap<>();

    public PathAllowList(List<PathAllowList.ConfigEntry> p_289956_) {
        this.entries = p_289956_;
    }

    public PathMatcher getForFileSystem(FileSystem p_289975_) {
        return this.compiledPaths.computeIfAbsent(p_289975_.provider().getScheme(), p_289958_ -> {
            List<PathMatcher> list;
            try {
                list = this.entries.stream().map(p_289937_ -> p_289937_.compile(p_289975_)).toList();
            } catch (Exception exception) {
                LOGGER.error("Failed to compile file pattern list", (Throwable)exception);
                return p_289987_ -> false;
            }
            return switch (list.size()) {
                case 0 -> p_289982_ -> false;
                case 1 -> (PathMatcher)list.get(0);
                default -> p_289927_ -> {
                    for (PathMatcher pathmatcher : list) {
                        if (pathmatcher.matches(p_289927_)) {
                            return true;
                        }
                    }

                    return false;
                };
            };
        });
    }

    @Override
    public boolean matches(Path p_289964_) {
        return this.getForFileSystem(p_289964_.getFileSystem()).matches(p_289964_);
    }

    public static PathAllowList readPlain(BufferedReader p_289921_) {
        return new PathAllowList(p_289921_.lines().flatMap(p_289962_ -> PathAllowList.ConfigEntry.parse(p_289962_).stream()).toList());
    }

    public record ConfigEntry(PathAllowList.EntryType type, String pattern) {
        public PathMatcher compile(FileSystem p_289936_) {
            return this.type().compile(p_289936_, this.pattern);
        }

        static Optional<PathAllowList.ConfigEntry> parse(String p_289947_) {
            if (p_289947_.isBlank() || p_289947_.startsWith("#")) {
                return Optional.empty();
            } else if (!p_289947_.startsWith("[")) {
                return Optional.of(new PathAllowList.ConfigEntry(PathAllowList.EntryType.PREFIX, p_289947_));
            } else {
                int i = p_289947_.indexOf(93, 1);
                if (i == -1) {
                    throw new IllegalArgumentException("Unterminated type in line '" + p_289947_ + "'");
                } else {
                    String s = p_289947_.substring(1, i);
                    String s1 = p_289947_.substring(i + 1);

                    return switch (s) {
                        case "glob", "regex" -> Optional.of(new PathAllowList.ConfigEntry(PathAllowList.EntryType.FILESYSTEM, s + ":" + s1));
                        case "prefix" -> Optional.of(new PathAllowList.ConfigEntry(PathAllowList.EntryType.PREFIX, s1));
                        default -> throw new IllegalArgumentException("Unsupported definition type in line '" + p_289947_ + "'");
                    };
                }
            }
        }

        static PathAllowList.ConfigEntry glob(String p_289983_) {
            return new PathAllowList.ConfigEntry(PathAllowList.EntryType.FILESYSTEM, "glob:" + p_289983_);
        }

        static PathAllowList.ConfigEntry regex(String p_289944_) {
            return new PathAllowList.ConfigEntry(PathAllowList.EntryType.FILESYSTEM, "regex:" + p_289944_);
        }

        static PathAllowList.ConfigEntry prefix(String p_289918_) {
            return new PathAllowList.ConfigEntry(PathAllowList.EntryType.PREFIX, p_289918_);
        }
    }

    @FunctionalInterface
    public interface EntryType {
        PathAllowList.EntryType FILESYSTEM = FileSystem::getPathMatcher;
        PathAllowList.EntryType PREFIX = (p_289949_, p_289938_) -> p_289955_ -> p_289955_.toString().startsWith(p_289938_);

        PathMatcher compile(FileSystem p_289924_, String p_289948_);
    }
}