szaszm commented on a change in pull request #1138: URL: https://github.com/apache/nifi-minifi-cpp/pull/1138#discussion_r680918382
########## File path: libminifi/src/utils/file/FileMatcher.cpp ########## @@ -0,0 +1,294 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF 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. + */ + +#include "utils/file/FileMatcher.h" +#include "utils/file/FileUtils.h" +#include "utils/StringUtils.h" + +namespace org { +namespace apache { +namespace nifi { +namespace minifi { +namespace utils { +namespace file { + +std::shared_ptr<core::logging::Logger> FileMatcher::FilePattern::logger_ = logging::LoggerFactory<FileMatcher::FilePattern>::getLogger(); +std::shared_ptr<core::logging::Logger> FileMatcher::logger_ = logging::LoggerFactory<FileMatcher>::getLogger(); + +static bool isGlobPattern(const std::string& pattern) { + return pattern.find_first_of("?*") != std::string::npos; +} + +static std::vector<std::string> split(const std::string& str, const std::vector<std::string>& delimiters) { + std::vector<std::string> result; + + size_t prev_delim_end = 0; + size_t next_delim_begin = std::string::npos; + do { + for (const auto& delim : delimiters) { + next_delim_begin = str.find(delim, prev_delim_end); + if (next_delim_begin != std::string::npos) { + result.push_back(str.substr(prev_delim_end, next_delim_begin - prev_delim_end)); + prev_delim_end = next_delim_begin + delim.length(); + break; + } + } + } while (next_delim_begin != std::string::npos); + result.push_back(str.substr(prev_delim_end)); + return result; +} + +#ifdef WIN32 +static const std::vector<std::string> path_separators{"/", "\\"}; +#else +static const std::vector<std::string> path_separators{"/"}; +#endif + +optional<FileMatcher::FilePattern> FileMatcher::FilePattern::fromPattern(std::string pattern) { + pattern = utils::StringUtils::trim(pattern); + bool excluding = false; + if (!pattern.empty() && pattern[0] == '!') { + excluding = true; + pattern = utils::StringUtils::trim(pattern.substr(1)); + } + if (pattern.empty()) { + logger_->log_error("Empty pattern"); + return nullopt; + } + std::string exe_dir = get_executable_dir(); + if (exe_dir.empty() && !isAbsolutePath(pattern.c_str())) { + logger_->log_error("Couldn't determine executable dir, relative pattern '%s' not supported", pattern); + return nullopt; + } + pattern = resolve(exe_dir, pattern); + auto segments = split(pattern, path_separators); + gsl_Expects(!segments.empty()); + auto file_pattern = segments.back(); + if (file_pattern == "**") { + file_pattern = "*"; + } else { + segments.pop_back(); + } + if (file_pattern == "." || file_pattern == "..") { + logger_->log_error("Invalid file pattern '%s'", file_pattern); + return nullopt; + } + bool after_wildcard = false; + for (const auto& segment : segments) { + if (after_wildcard && segment == "..") { + logger_->log_error("Parent accessor is not supported after wildcards"); + return nullopt; + } + if (isGlobPattern(segment)) { + after_wildcard = true; + } + } + return FilePattern(segments, file_pattern, excluding); +} + +std::string FileMatcher::FilePattern::getBaseDirectory() const { + std::string base_dir; + for (const auto& segment : directory_segments_) { + // ignore segments at or after wildcards + if (isGlobPattern(segment)) { + break; + } + base_dir += segment + get_separator(); + } + return base_dir; +} + +FileMatcher::FileMatcher(const std::string &patterns) { + for (auto&& pattern : split(patterns, {","})) { + if (auto&& p = FilePattern::fromPattern(pattern)) { + patterns_.push_back(std::move(p.value())); + } + } +} + +template<typename It> +static bool advance_if_not_equal(It& it, const It& end) { + if (it == end) { + return false; + } + ++it; + return true; +} + +static bool is_this_dir(const std::string& dir) { + return dir.empty() || dir == "."; +} + +template<typename It, typename Fn> +static void skip_if(It& it, const It& end, const Fn& fn) { + while (it != end && fn(*it)) { + ++it; + } +} + +static bool matchGlob(std::string::const_iterator pattern_it, std::string::const_iterator pattern_end, std::string::const_iterator value_it, std::string::const_iterator value_end) { Review comment: #1142 seems to be quite close to merge -- This is an automated message from the Apache Git Service. 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