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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.openqa.selenium.grid.web;

import static com.google.common.collect.ImmutableSet.toImmutableSet;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Optional;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Stream;
import org.openqa.selenium.internal.Require;

public class PathResource implements Resource {

  private final Path base;
  private final Predicate allowedSubpaths;

  public PathResource(Path base) {
    this(Require.nonNull("Base path", base), str -> true);
  }

  private PathResource(Path base, Predicate allowedSubpaths) {
    this.base = Require.nonNull("Base path", base).normalize();
    this.allowedSubpaths = Require.nonNull("Sub-path predicate", allowedSubpaths);
  }

  public PathResource limit(String... subpaths) {
    return new PathResource(
        base,
        path -> Arrays.stream(subpaths).anyMatch(subpath -> Files.exists(base.resolve(subpath))));
  }

  @Override
  public String name() {
    return base.getFileName() == null ? "" : base.getFileName().toString();
  }

  @Override
  public Optional get(String path) {
    // Paths are expected to start with a leading slash. Strip it, if present
    if (path.startsWith("/")) {
      path = path.length() == 1 ? "" : path.substring(1);
    }

    Path normalized = base.resolve(path).normalize();
    if (!normalized.startsWith(base)) {
      throw new RuntimeException("Attempt to navigate away from the parent directory");
    }

    if (!allowedSubpaths.test(normalized)) {
      return Optional.empty();
    }

    if (Files.exists(normalized)) {
      return Optional.of(new PathResource(normalized));
    }

    return Optional.empty();
  }

  @Override
  public boolean isDirectory() {
    return Files.isDirectory(base);
  }

  @Override
  public Set list() {
    try (Stream files = Files.list(base)) {
      return files.filter(allowedSubpaths).map(PathResource::new).collect(toImmutableSet());
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }

  @Override
  public Optional read() {
    if (!Files.exists(base)) {
      return Optional.empty();
    }

    try {
      return Optional.of(Files.readAllBytes(base));
    } catch (IOException e) {
      throw new UncheckedIOException(e);
    }
  }
}




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