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#include <Common/StringUtils/StringUtils.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionStringToString.h>
#include <Functions/StringHelpers.h>
namespace DB
{
/// NOTE: Implementation is not RFC3986 compatible
struct ExtractNetloc
{
/// We use the same as domain function
static size_t getReserveLengthForElement() { return 15; }
static std::string_view getNetworkLocation(const char * data, size_t size)
{
Pos pos = data;
Pos end = data + size;
/// Skip scheme.
if (pos + 2 < end && pos[0] == '/' && pos[1] == '/')
{
pos += 2;
}
else
{
Pos scheme_end = data + std::min(size, 16UL);
for (++pos; pos < scheme_end; ++pos)
{
if (!isAlphaNumericASCII(*pos))
{
switch (*pos)
{
case '.':
case '-':
case '+':
break;
case ' ': /// restricted symbols
case '\t':
case '<':
case '>':
case '%':
case '{':
case '}':
case '|':
case '\\':
case '^':
case '~':
case '[':
case ']':
case ';':
case '=':
case '&':
return std::string_view();
default:
goto exloop;
}
}
}
exloop:
if (pos + 2 < scheme_end && pos[0] == ':' && pos[1] == '/' && pos[2] == '/')
pos += 3;
else
pos = data;
}
/// Now pos points to the first byte after scheme (if there is).
bool has_identification = false;
Pos hostname_end = end;
Pos question_mark_pos = end;
Pos slash_pos = end;
Pos start_of_host = pos;
for (; pos < end; ++pos)
{
switch (*pos)
{
case '/':
if (has_identification)
return std::string_view(start_of_host, pos - start_of_host);
else
slash_pos = pos;
break;
case '?':
if (has_identification)
return std::string_view(start_of_host, pos - start_of_host);
else
question_mark_pos = pos;
break;
case '#':
return std::string_view(start_of_host, pos - start_of_host);
case '@': /// foo:bar@example.ru
has_identification = true;
hostname_end = end;
break;
case ';':
case '=':
case '&':
case '~':
case '%':
/// Symbols above are sub-delims in RFC3986 and should be
/// allowed for userinfo (named identification here).
///
/// NOTE: that those symbols is allowed for reg-name (host)
/// too, but right now host parsing looks more like in
/// RFC1034 (in other words domains that are allowed to be
/// registered).
if (!has_identification)
{
hostname_end = pos;
break;
}
[[fallthrough]];
case ' ': /// restricted symbols in whole URL
case '\t':
case '<':
case '>':
case '{':
case '}':
case '|':
case '\\':
case '^':
case '[':
case ']':
return pos > start_of_host
? std::string_view(start_of_host, std::min(std::min(pos, question_mark_pos), slash_pos) - start_of_host)
: std::string_view();
}
}
if (has_identification)
return std::string_view(start_of_host, pos - start_of_host);
else
return std::string_view(start_of_host, std::min(std::min(std::min(pos, question_mark_pos), slash_pos), hostname_end) - start_of_host);
}
static void execute(Pos data, size_t size, Pos & res_data, size_t & res_size)
{
std::string_view host = getNetworkLocation(data, size);
res_data = host.data();
res_size = host.size();
}
};
struct NameNetloc { static constexpr auto name = "netloc"; };
using FunctionNetloc = FunctionStringToString<ExtractSubstringImpl<ExtractNetloc>, NameNetloc>;
REGISTER_FUNCTION(Netloc)
{
factory.registerFunction<FunctionNetloc>();
}
}
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