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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed 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.
#ifndef INCLUDED_SRC_UTILS_CPP_PATH_HPP
#define INCLUDED_SRC_UTILS_CPP_PATH_HPP
#include <filesystem>
#include <sstream>
[[nodiscard]] static inline auto ToNormalPath(
std::filesystem::path const& p) noexcept -> std::filesystem::path {
auto n = p.lexically_normal();
if (not n.has_filename()) {
n = n.parent_path();
}
if (n.empty()) {
return std::filesystem::path{"."};
}
return n;
}
/// \brief Perform a non-upwards condition check on the given path.
/// A path is non-upwards if it is relative and it never references any other
/// path on a higher level in the directory tree than itself.
[[nodiscard]] static inline auto PathIsNonUpwards(
std::filesystem::path const& path) noexcept -> bool {
if (path.is_absolute()) {
return false;
}
// check non-upwards condition
return *path.lexically_normal().begin() != "..";
}
/// \brief Perform a confined condition check on a path with respect to
/// another path. A path is confined wrt another if it is relative and results
/// in a non-upwards path when applied from the directory of the other path.
/// This models the situation when a symlink is being resolved inside a tree.
/// NOTE: No explicit check is done whether applied_to is actually a relative
/// path, as this is implicit by the non-upwardness condition.
[[nodiscard]] static inline auto PathIsConfined(
std::filesystem::path const& path,
std::filesystem::path const& applied_to) noexcept -> bool {
if (path.is_absolute()) {
return false;
}
// check confined upwards condition; this call also handles the case when
// applied_to is an absolute path
return PathIsNonUpwards(applied_to.parent_path() / path);
}
#endif // INCLUDED_SRC_UTILS_CPP_PATH_HPP
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