#pragma once

#include "envoy/http/header_map.h"

#include "absl/strings/string_view.h"

namespace Envoy {

namespace Http {

/**

 * Path helper extracted from chromium project.

 */

class PathUtil {

public:

  // Returns true if the normalization succeeds.

  // If it is successful, the path header will be updated with the normalized path.

  // Requires the Path header be present.

  static bool canonicalPath(RequestHeaderMap& headers);

  // Merges two or more adjacent slashes in path part of URI into one.

  // Requires the Path header be present.

  static void mergeSlashes(RequestHeaderMap& headers);

  enum class UnescapeSlashesResult {

    // No escaped slash sequences were found and URL path has not been modified.

    NotFound = 0,

    // Escaped slash sequences were found and URL path has been modified.

    FoundAndUnescaped = 1,

  };

  // Unescape %2F, %2f, %5C and %5c sequences.

  // Requires the Path header be present.

  // Returns the result of unescaping slashes.

  static UnescapeSlashesResult unescapeSlashes(RequestHeaderMap& headers);

  // Removes the query and/or fragment string (if present) from the input path.

  // For example, this function returns "/data" for the input path "/data?param=value#fragment".

  static absl::string_view removeQueryAndFragment(const absl::string_view path);

};

} // namespace Http

} // namespace Envoy