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#pragma once
#include <base/find_symbols.h>
#include "domain.h"
#include "tldLookup.h"
#include <Common/TLDListsHolder.h> /// TLDType
namespace DB
{
struct FirstSignificantSubdomainDefaultLookup
{
bool operator()(StringRef host) const
{
return tldLookup::isValid(host.data, host.size);
}
};
template <bool without_www, bool conform_rfc>
struct ExtractFirstSignificantSubdomain
{
static size_t getReserveLengthForElement() { return 10; }
static void execute(const Pos data, const size_t size, Pos & res_data, size_t & res_size, Pos * out_domain_end = nullptr)
{
FirstSignificantSubdomainDefaultLookup loookup;
return execute(loookup, data, size, res_data, res_size, out_domain_end);
}
template <class Lookup>
static void execute(const Lookup & lookup, const Pos data, const size_t size, Pos & res_data, size_t & res_size, Pos * out_domain_end = nullptr)
{
res_data = data;
res_size = 0;
Pos tmp;
size_t domain_length;
ExtractDomain<without_www, conform_rfc>::execute(data, size, tmp, domain_length);
if (domain_length == 0)
return;
if (out_domain_end)
*out_domain_end = tmp + domain_length;
/// cut useless dot
if (tmp[domain_length - 1] == '.')
--domain_length;
res_data = tmp;
res_size = domain_length;
const auto * begin = tmp;
const auto * end = begin + domain_length;
std::array<const char *, 3> last_periods{};
const auto * pos = find_first_symbols<'.'>(begin, end);
while (pos < end)
{
last_periods[2] = last_periods[1];
last_periods[1] = last_periods[0];
last_periods[0] = pos;
pos = find_first_symbols<'.'>(pos + 1, end);
}
if (!last_periods[0])
return;
if (!last_periods[1])
{
res_size = last_periods[0] - begin;
return;
}
if (!last_periods[2])
last_periods[2] = begin - 1;
const auto * end_of_level_domain = find_first_symbols<'/'>(last_periods[0], end);
if (!end_of_level_domain)
{
end_of_level_domain = end;
}
size_t host_len = static_cast<size_t>(end_of_level_domain - last_periods[1] - 1);
StringRef host{last_periods[1] + 1, host_len};
if (lookup(host))
{
res_data += last_periods[2] + 1 - begin;
res_size = last_periods[1] - last_periods[2] - 1;
}
else
{
res_data += last_periods[1] + 1 - begin;
res_size = last_periods[0] - last_periods[1] - 1;
}
}
/// The difference with execute() is due to custom TLD list can have records of any level,
/// not only 2-nd level (like non-custom variant), so it requires more lookups.
template <class Lookup>
static void executeCustom(const Lookup & lookup, const Pos data, const size_t size, Pos & res_data, size_t & res_size, Pos * out_domain_end = nullptr)
{
res_data = data;
res_size = 0;
Pos tmp;
size_t domain_length;
ExtractDomain<without_www, conform_rfc>::execute(data, size, tmp, domain_length);
if (domain_length == 0)
return;
if (out_domain_end)
*out_domain_end = tmp + domain_length;
/// cut useless dot
if (tmp[domain_length - 1] == '.')
--domain_length;
res_data = tmp;
res_size = domain_length;
const auto * begin = tmp;
const auto * end = begin + domain_length;
std::array<const char *, 2> last_periods{};
last_periods[0] = begin - 1;
StringRef excluded_host{};
const auto * pos = find_first_symbols<'.'>(begin, end);
while (pos < end)
{
size_t host_len = static_cast<size_t>(end - pos - 1);
StringRef host{pos + 1, host_len};
TLDType tld_type = lookup(host);
switch (tld_type)
{
case TLDType::TLD_NONE:
break;
case TLDType::TLD_REGULAR:
res_data += last_periods[0] + 1 - begin;
res_size = end - 1 - last_periods[0];
return;
case TLDType::TLD_ANY:
{
StringRef regular_host{last_periods[0] + 1, static_cast<size_t>(end - 1 - last_periods[0])};
if (last_periods[1] && excluded_host != regular_host)
{
/// Return TLD_REGULAR + 1
res_data += last_periods[1] + 1 - begin;
res_size = end - 1 - last_periods[1];
}
else
{
/// Same as TLD_REGULAR
res_data += last_periods[0] + 1 - begin;
res_size = end - 1 - last_periods[0];
}
return;
}
case TLDType::TLD_EXCLUDE:
excluded_host = host;
break;
}
last_periods[1] = last_periods[0];
last_periods[0] = pos;
pos = find_first_symbols<'.'>(pos + 1, end);
}
/// - if there is domain of the first level (i.e. no dots in the hostname) ->
/// return nothing
if (last_periods[0] == begin - 1)
return;
/// - if there is domain of the second level ->
/// always return itself
///
/// - if there is domain of the 3+ level, and zero records in TLD list ->
/// fallback to domain of the second level
res_data += last_periods[1] + 1 - begin;
res_size = last_periods[0] - last_periods[1] - 1;
}
};
}
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