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#include <Access/Common/AccessRightsElement.h>
#include <Common/quoteString.h>
#include <boost/range/algorithm_ext/erase.hpp>
namespace DB
{
namespace
{
void formatColumnNames(const Strings & columns, String & result)
{
result += "(";
bool need_comma = false;
for (const auto & column : columns)
{
if (need_comma)
result += ", ";
need_comma = true;
result += backQuoteIfNeed(column);
}
result += ")";
}
void formatONClause(const AccessRightsElement & element, String & result)
{
result += "ON ";
if (element.isGlobalWithParameter())
{
if (element.any_parameter)
result += "*";
else
result += backQuoteIfNeed(element.parameter);
}
else if (element.any_database)
{
result += "*.*";
}
else
{
if (!element.database.empty())
{
result += backQuoteIfNeed(element.database);
result += ".";
}
if (element.any_table)
result += "*";
else
result += backQuoteIfNeed(element.table);
}
}
void formatOptions(bool grant_option, bool is_partial_revoke, String & result)
{
if (is_partial_revoke)
{
if (grant_option)
result.insert(0, "REVOKE GRANT OPTION ");
else
result.insert(0, "REVOKE ");
}
else
{
if (grant_option)
result.insert(0, "GRANT ").append(" WITH GRANT OPTION");
else
result.insert(0, "GRANT ");
}
}
void formatAccessFlagsWithColumns(const AccessFlags & access_flags, const Strings & columns, bool any_column, String & result)
{
String columns_as_str;
if (!any_column)
{
if (columns.empty())
{
result += "USAGE";
return;
}
formatColumnNames(columns, columns_as_str);
}
auto keywords = access_flags.toKeywords();
if (keywords.empty())
{
result += "USAGE";
return;
}
bool need_comma = false;
for (std::string_view keyword : keywords)
{
if (need_comma)
result.append(", ");
need_comma = true;
result += keyword;
result += columns_as_str;
}
}
String toStringImpl(const AccessRightsElement & element, bool with_options)
{
String result;
formatAccessFlagsWithColumns(element.access_flags, element.columns, element.any_column, result);
result += " ";
formatONClause(element, result);
if (with_options)
formatOptions(element.grant_option, element.is_partial_revoke, result);
return result;
}
String toStringImpl(const AccessRightsElements & elements, bool with_options)
{
if (elements.empty())
return with_options ? "GRANT USAGE ON *.*" : "USAGE ON *.*";
String result;
String part;
for (size_t i = 0; i != elements.size(); ++i)
{
const auto & element = elements[i];
if (!part.empty())
part += ", ";
formatAccessFlagsWithColumns(element.access_flags, element.columns, element.any_column, part);
bool next_element_uses_same_table_and_options = false;
if (i != elements.size() - 1)
{
const auto & next_element = elements[i + 1];
if (element.sameDatabaseAndTableAndParameter(next_element) && element.sameOptions(next_element))
{
next_element_uses_same_table_and_options = true;
}
}
if (!next_element_uses_same_table_and_options)
{
part += " ";
formatONClause(element, part);
if (with_options)
formatOptions(element.grant_option, element.is_partial_revoke, part);
if (result.empty())
result = std::move(part);
else
result.append(", ").append(part);
part.clear();
}
}
return result;
}
}
AccessRightsElement::AccessRightsElement(AccessFlags access_flags_, std::string_view database_)
: access_flags(access_flags_), database(database_), parameter(database_), any_database(false), any_parameter(false)
{
}
AccessRightsElement::AccessRightsElement(AccessFlags access_flags_, std::string_view database_, std::string_view table_)
: access_flags(access_flags_), database(database_), table(table_), any_database(false), any_table(false)
{
}
AccessRightsElement::AccessRightsElement(
AccessFlags access_flags_, std::string_view database_, std::string_view table_, std::string_view column_)
: access_flags(access_flags_)
, database(database_)
, table(table_)
, columns({String{column_}})
, any_database(false)
, any_table(false)
, any_column(false)
, any_parameter(false)
{
}
AccessRightsElement::AccessRightsElement(
AccessFlags access_flags_,
std::string_view database_,
std::string_view table_,
const std::vector<std::string_view> & columns_)
: access_flags(access_flags_), database(database_), table(table_), any_database(false), any_table(false), any_column(false)
{
columns.resize(columns_.size());
for (size_t i = 0; i != columns_.size(); ++i)
columns[i] = String{columns_[i]};
}
AccessRightsElement::AccessRightsElement(
AccessFlags access_flags_, std::string_view database_, std::string_view table_, const Strings & columns_)
: access_flags(access_flags_)
, database(database_)
, table(table_)
, columns(columns_)
, any_database(false)
, any_table(false)
, any_column(false)
, any_parameter(false)
{
}
void AccessRightsElement::eraseNonGrantable()
{
if (isGlobalWithParameter() && !any_parameter)
access_flags &= AccessFlags::allFlagsGrantableOnGlobalWithParameterLevel();
else if (!any_column)
access_flags &= AccessFlags::allFlagsGrantableOnColumnLevel();
else if (!any_table)
access_flags &= AccessFlags::allFlagsGrantableOnTableLevel();
else if (!any_database)
access_flags &= AccessFlags::allFlagsGrantableOnDatabaseLevel();
else
access_flags &= AccessFlags::allFlagsGrantableOnGlobalLevel();
}
void AccessRightsElement::replaceEmptyDatabase(const String & current_database)
{
if (isEmptyDatabase())
database = current_database;
}
String AccessRightsElement::toString() const { return toStringImpl(*this, true); }
String AccessRightsElement::toStringWithoutOptions() const { return toStringImpl(*this, false); }
bool AccessRightsElements::empty() const { return std::all_of(begin(), end(), [](const AccessRightsElement & e) { return e.empty(); }); }
bool AccessRightsElements::sameDatabaseAndTableAndParameter() const
{
return (size() < 2) || std::all_of(std::next(begin()), end(), [this](const AccessRightsElement & e) { return e.sameDatabaseAndTableAndParameter(front()); });
}
bool AccessRightsElements::sameDatabaseAndTable() const
{
return (size() < 2) || std::all_of(std::next(begin()), end(), [this](const AccessRightsElement & e) { return e.sameDatabaseAndTable(front()); });
}
bool AccessRightsElements::sameOptions() const
{
return (size() < 2) || std::all_of(std::next(begin()), end(), [this](const AccessRightsElement & e) { return e.sameOptions(front()); });
}
void AccessRightsElements::eraseNonGrantable()
{
boost::range::remove_erase_if(*this, [](AccessRightsElement & element)
{
element.eraseNonGrantable();
return element.empty();
});
}
void AccessRightsElements::replaceEmptyDatabase(const String & current_database)
{
for (auto & element : *this)
element.replaceEmptyDatabase(current_database);
}
String AccessRightsElements::toString() const { return toStringImpl(*this, true); }
String AccessRightsElements::toStringWithoutOptions() const { return toStringImpl(*this, false); }
}
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