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Jailed File System
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/*
 * Copyright (c) 2007 through 2024 David Berkman
 *
 * This file is part of the SmallMind Code Project.
 *
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 *
 * 1) The terms of 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.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * The SmallMind Code Project 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
 * General Public License or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.file.jailed;

import java.nio.file.Path;

public abstract class AbstractJailedPathTranslator implements JailedPathTranslator {

  public Path wrapPath (Path rootPath, JailedFileSystem jailedFileSystem, Path nativePath) {

    if (nativePath.isAbsolute()) {
      if (!nativePath.startsWith(rootPath)) {
        throw new SecurityException("No authorization for path");
      } else {

        StringBuilder pathBuilder = new StringBuilder();

        for (int index = rootPath.getNameCount(); index < nativePath.getNameCount(); index++) {
          pathBuilder.append(jailedFileSystem.getSeparator()).append(nativePath.getName(index));
        }

        return new JailedPath(jailedFileSystem, pathBuilder.toString());
      }
    } else {

      StringBuilder pathBuilder = new StringBuilder();

      for (int index = 0; index < nativePath.getNameCount(); index++) {
        pathBuilder.append('/').append(nativePath.getName(index));
      }

      return new JailedPath(jailedFileSystem, pathBuilder.toString());
    }
  }

  public Path unwrapPath (Path rootPath, Path jailedPath) {

    StringBuilder pathBuilder = new StringBuilder();

    for (int index = 0; index < jailedPath.getNameCount(); index++) {
      if (index > 0) {
        pathBuilder.append(getNativeFileSystem().getSeparator());
      }
      pathBuilder.append(jailedPath.getName(index));
    }

    return rootPath.resolve(pathBuilder.toString());
  }
}