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97d8a4ea86
Summary: resolves T13332 Reviewers: ivica Reviewed By: ivica Subscribers: miljen, iljazovic Maniphest Tasks: T13332 Differential Revision: https://repo.mireo.local/D27000
108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
#ifndef ASYNC_MQTT5_TOPIC_VALIDATION_HPP
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#define ASYNC_MQTT5_TOPIC_VALIDATION_HPP
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#include <string>
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#include <async_mqtt5/detail/utf8_mqtt.hpp>
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namespace async_mqtt5::detail {
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static constexpr uint32_t min_subscription_identifier = 1;
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static constexpr uint32_t max_subscription_identifier = 268'435'455;
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static constexpr std::string_view shared_sub_id = "$share/";
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inline bool is_utf8_no_wildcard(validation_result result) {
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return result == validation_result::valid;
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}
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inline bool is_not_empty(size_t sz) {
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return sz != 0;
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}
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inline bool is_valid_topic_size(size_t sz) {
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return is_not_empty(sz) && is_valid_string_size(sz);
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}
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inline validation_result validate_topic_name(std::string_view str) {
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return validate_impl(str, is_valid_topic_size, is_utf8_no_wildcard);
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}
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inline validation_result validate_share_name(std::string_view str) {
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return validate_impl(str, is_not_empty, is_utf8_no_wildcard);
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}
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inline validation_result validate_topic_filter(std::string_view str) {
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if (!is_valid_topic_size(str.size()))
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return validation_result::invalid;
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constexpr int multi_lvl_wildcard = '#';
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constexpr int single_lvl_wildcard = '+';
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// must be the last character preceded by '/' or stand alone
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// #, .../#
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if (str.back() == multi_lvl_wildcard) {
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str.remove_suffix(1);
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if (!str.empty() && str.back() != '/')
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return validation_result::invalid;
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}
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int last_c = -1;
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validation_result result;
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while (!str.empty()) {
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int c = pop_front_unichar(str);
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// can be used at any level, but must occupy an entire level
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// +, +/..., .../+/..., .../+
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bool is_valid_single_lvl = (c == single_lvl_wildcard) &&
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(str.empty() || str.front() == '/') &&
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(last_c == -1 || last_c == '/');
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result = validate_mqtt_utf8_char(c);
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if (
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result == validation_result::valid ||
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is_valid_single_lvl
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) {
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last_c = c;
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continue;
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}
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return validation_result::invalid;
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}
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return validation_result::valid;
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}
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inline validation_result validate_shared_topic_filter(
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std::string_view str, bool wildcard_allowed = true
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) {
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if (!is_valid_topic_size(str.size()))
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return validation_result::invalid;
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if (str.compare(0, shared_sub_id.size(), shared_sub_id) != 0)
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return validation_result::invalid;
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str.remove_prefix(shared_sub_id.size());
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size_t share_name_end = str.find_first_of('/');
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if (share_name_end == std::string::npos)
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return validation_result::invalid;
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validation_result result;
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result = validate_share_name(str.substr(0, share_name_end));
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if (result != validation_result::valid)
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return validation_result::invalid;
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auto topic_filter = str.substr(share_name_end + 1);
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return wildcard_allowed ?
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validate_topic_filter(topic_filter) :
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validate_topic_name(topic_filter)
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;
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}
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} // end namespace async_mqtt5::detail
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#endif //ASYNC_MQTT5_TOPIC_VALIDATION_HPP
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