mirror of
https://github.com/google/sandboxed-api.git
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104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "sandboxed_api/util/path.h"
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#include <deque>
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#include "absl/strings/match.h"
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#include "absl/strings/str_cat.h"
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#include "absl/strings/str_join.h"
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#include "absl/strings/str_split.h"
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#include "absl/strings/strip.h"
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namespace sapi::file {
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namespace internal {
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constexpr char kPathSeparator[] = "/";
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std::string JoinPathImpl(std::initializer_list<absl::string_view> paths) {
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std::string result;
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for (const auto& path : paths) {
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if (path.empty()) {
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continue;
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}
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if (result.empty()) {
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absl::StrAppend(&result, path);
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continue;
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}
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const auto comp = absl::StripPrefix(path, kPathSeparator);
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if (absl::EndsWith(result, kPathSeparator)) {
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absl::StrAppend(&result, comp);
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} else {
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absl::StrAppend(&result, kPathSeparator, comp);
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}
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}
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return result;
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}
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} // namespace internal
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bool IsAbsolutePath(absl::string_view path) {
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return !path.empty() && path[0] == '/';
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}
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std::pair<absl::string_view, absl::string_view> SplitPath(
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absl::string_view path) {
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const auto pos = path.find_last_of('/');
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// Handle the case with no '/' in 'path'.
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if (pos == absl::string_view::npos) {
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return {path.substr(0, 0), path};
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}
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// Handle the case with a single leading '/' in 'path'.
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if (pos == 0) {
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return {path.substr(0, 1), absl::ClippedSubstr(path, 1)};
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}
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return {path.substr(0, pos), absl::ClippedSubstr(path, pos + 1)};
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}
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std::string CleanPath(const absl::string_view unclean_path) {
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int dotdot_num = 0;
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std::deque<absl::string_view> parts;
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for (absl::string_view part :
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absl::StrSplit(unclean_path, '/', absl::SkipEmpty())) {
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if (part == "..") {
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if (parts.empty()) {
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++dotdot_num;
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} else {
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parts.pop_back();
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}
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} else if (part != ".") {
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parts.push_back(part);
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}
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}
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if (absl::StartsWith(unclean_path, "/")) {
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if (parts.empty()) {
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return "/";
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}
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parts.push_front("");
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} else {
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for (; dotdot_num; --dotdot_num) {
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parts.push_front("..");
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}
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if (parts.empty()) {
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return ".";
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}
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}
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return absl::StrJoin(parts, "/");
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}
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} // namespace sapi::file
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