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/**
* Copyright (C) 2017 MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/namespace_string.h"
#include <ostream>
#include "mongo/base/parse_number.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::string;
namespace {
/**
* A map of characters to escape. Instead of printing certain characters we output
* based on the following table.
*/
const string escapeTable[256] = {
".00", ".01", ".02", ".03", ".04", ".05", ".06", ".07", ".08", ".09", ".10", ".11",
".12", ".13", ".14", ".15", ".16", ".17", ".18", ".19", ".20", ".21", ".22", ".23",
".24", ".25", ".26", ".27", ".28", ".29", ".30", ".31", ".32", ".33", ".34", ".35",
".36", ".37", ".38", ".39", ".40", ".41", ".42", ".43", ".44", ".45", ".", ".47",
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ".58", ".59",
".60", ".61", ".62", ".63", ".64", "A", "B", "C", "D", "E", "F", "G",
"H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S",
"T", "U", "V", "W", "X", "Y", "Z", ".91", ".92", ".93", ".94", "_",
".96", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
"x", "y", "z", ".123", ".124", ".125", ".126", ".127", ".128", ".129", ".130", ".131",
".132", ".133", ".134", ".135", ".136", ".137", ".138", ".139", ".140", ".141", ".142", ".143",
".144", ".145", ".146", ".147", ".148", ".149", ".150", ".151", ".152", ".153", ".154", ".155",
".156", ".157", ".158", ".159", ".160", ".161", ".162", ".163", ".164", ".165", ".166", ".167",
".168", ".169", ".170", ".171", ".172", ".173", ".174", ".175", ".176", ".177", ".178", ".179",
".180", ".181", ".182", ".183", ".184", ".185", ".186", ".187", ".188", ".189", ".190", ".191",
".192", ".193", ".194", ".195", ".196", ".197", ".198", ".199", ".200", ".201", ".202", ".203",
".204", ".205", ".206", ".207", ".208", ".209", ".210", ".211", ".212", ".213", ".214", ".215",
".216", ".217", ".218", ".219", ".220", ".221", ".222", ".223", ".224", ".225", ".226", ".227",
".228", ".229", ".230", ".231", ".232", ".233", ".234", ".235", ".236", ".237", ".238", ".239",
".240", ".241", ".242", ".243", ".244", ".245", ".246", ".247", ".248", ".249", ".250", ".251",
".252", ".253", ".254", ".255"};
const char kServerConfiguration[] = "admin.system.version";
constexpr auto listCollectionsCursorCol = "$cmd.listCollections"_sd;
constexpr auto listIndexesCursorNSPrefix = "$cmd.listIndexes."_sd;
constexpr auto collectionlessAggregateCursorCol = "$cmd.aggregate"_sd;
constexpr auto dropPendingNSPrefix = "system.drop."_sd;
} // namespace
constexpr StringData NamespaceString::kAdminDb;
constexpr StringData NamespaceString::kLocalDb;
constexpr StringData NamespaceString::kConfigDb;
constexpr StringData NamespaceString::kSystemDotViewsCollectionName;
constexpr StringData NamespaceString::kShardConfigCollectionsCollectionName;
constexpr StringData NamespaceString::kSystemKeysCollectionName;
const NamespaceString NamespaceString::kServerConfigurationNamespace(kServerConfiguration);
const NamespaceString NamespaceString::kSessionTransactionsTableNamespace(
NamespaceString::kConfigDb, "transactions");
const NamespaceString NamespaceString::kRsOplogNamespace(NamespaceString::kLocalDb, "oplog.rs");
bool NamespaceString::isListCollectionsCursorNS() const {
return coll() == listCollectionsCursorCol;
}
bool NamespaceString::isListIndexesCursorNS() const {
return coll().size() > listIndexesCursorNSPrefix.size() &&
coll().startsWith(listIndexesCursorNSPrefix);
}
bool NamespaceString::isCollectionlessAggregateNS() const {
return coll() == collectionlessAggregateCursorCol;
}
bool NamespaceString::isLegalClientSystemNS() const {
if (db() == "admin") {
if (ns() == "admin.system.roles")
return true;
if (ns() == kServerConfiguration)
return true;
if (ns() == kSystemKeysCollectionName)
return true;
if (ns() == "admin.system.new_users")
return true;
if (ns() == "admin.system.backup_users")
return true;
} else if (db() == "config") {
if (ns() == "config.system.sessions")
return true;
}
if (ns() == "local.system.replset")
return true;
if (coll() == "system.users")
return true;
if (coll() == "system.js")
return true;
if (coll() == kSystemDotViewsCollectionName)
return true;
return false;
}
NamespaceString NamespaceString::makeListCollectionsNSS(StringData dbName) {
NamespaceString nss(dbName, listCollectionsCursorCol);
dassert(nss.isValid());
dassert(nss.isListCollectionsCursorNS());
return nss;
}
NamespaceString NamespaceString::makeListIndexesNSS(StringData dbName, StringData collectionName) {
NamespaceString nss(dbName, str::stream() << listIndexesCursorNSPrefix << collectionName);
dassert(nss.isValid());
dassert(nss.isListIndexesCursorNS());
return nss;
}
NamespaceString NamespaceString::makeCollectionlessAggregateNSS(StringData dbname) {
NamespaceString nss(dbname, collectionlessAggregateCursorCol);
dassert(nss.isValid());
dassert(nss.isCollectionlessAggregateNS());
return nss;
}
NamespaceString NamespaceString::getTargetNSForListIndexes() const {
dassert(isListIndexesCursorNS());
return NamespaceString(db(), coll().substr(listIndexesCursorNSPrefix.size()));
}
boost::optional<NamespaceString> NamespaceString::getTargetNSForGloballyManagedNamespace() const {
// Globally managed namespaces are of the form '$cmd.commandName.<targetNs>' or simply
// '$cmd.commandName'.
dassert(isGloballyManagedNamespace());
const size_t indexOfNextDot = coll().find('.', 5);
if (indexOfNextDot == std::string::npos) {
return boost::none;
}
return NamespaceString{db(), coll().substr(indexOfNextDot + 1)};
}
bool NamespaceString::isDropPendingNamespace() const {
return coll().startsWith(dropPendingNSPrefix);
}
NamespaceString NamespaceString::makeDropPendingNamespace(const repl::OpTime& opTime) const {
mongo::StringBuilder ss;
ss << db() << "." << dropPendingNSPrefix;
ss << opTime.getSecs() << "i" << opTime.getTimestamp().getInc() << "t" << opTime.getTerm();
ss << "." << coll();
return NamespaceString(ss.stringData().substr(0, MaxNsCollectionLen));
}
StatusWith<repl::OpTime> NamespaceString::getDropPendingNamespaceOpTime() const {
if (!isDropPendingNamespace()) {
return Status(ErrorCodes::BadValue,
str::stream() << "Not a drop-pending namespace: " << _ns);
}
auto collectionName = coll();
auto opTimeBeginIndex = dropPendingNSPrefix.size();
auto opTimeEndIndex = collectionName.find('.', opTimeBeginIndex);
auto opTimeStr = std::string::npos == opTimeEndIndex
? collectionName.substr(opTimeBeginIndex)
: collectionName.substr(opTimeBeginIndex, opTimeEndIndex - opTimeBeginIndex);
auto incrementSeparatorIndex = opTimeStr.find('i');
if (std::string::npos == incrementSeparatorIndex) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Missing 'i' separator in drop-pending namespace: " << _ns);
}
auto termSeparatorIndex = opTimeStr.find('t', incrementSeparatorIndex);
if (std::string::npos == termSeparatorIndex) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Missing 't' separator in drop-pending namespace: " << _ns);
}
long long seconds;
auto status = parseNumberFromString(opTimeStr.substr(0, incrementSeparatorIndex), &seconds);
if (!status.isOK()) {
return Status(
status.code(),
str::stream() << "Invalid timestamp seconds in drop-pending namespace: " << _ns << ": "
<< status.reason());
}
unsigned int increment;
status =
parseNumberFromString(opTimeStr.substr(incrementSeparatorIndex + 1,
termSeparatorIndex - (incrementSeparatorIndex + 1)),
&increment);
if (!status.isOK()) {
return Status(status.code(),
str::stream() << "Invalid timestamp increment in drop-pending namespace: "
<< _ns
<< ": "
<< status.reason());
}
long long term;
status = mongo::parseNumberFromString(opTimeStr.substr(termSeparatorIndex + 1), &term);
if (!status.isOK()) {
return Status(status.code(),
str::stream() << "Invalid term in drop-pending namespace: " << _ns << ": "
<< status.reason());
}
return repl::OpTime(Timestamp(Seconds(seconds), increment), term);
}
Status NamespaceString::checkLengthForRename(
const std::string::size_type longestIndexNameLength) const {
auto longestAllowed =
std::min(std::string::size_type(NamespaceString::MaxNsCollectionLen),
std::string::size_type(NamespaceString::MaxNsLen - 2U /*strlen(".$")*/ -
longestIndexNameLength));
if (size() > longestAllowed) {
StringBuilder sb;
sb << "collection name length of " << size() << " exceeds maximum length of "
<< longestAllowed << ", allowing for index names";
return Status(ErrorCodes::InvalidLength, sb.str());
}
return Status::OK();
}
string NamespaceString::escapeDbName(const StringData dbname) {
std::string escapedDbName;
// pre-alloc the return string as it will always be the same as dbname at a minimum.
escapedDbName.reserve(dbname.size());
for (unsigned char c : dbname) {
escapedDbName += escapeTable[c];
}
return escapedDbName;
}
std::ostream& operator<<(std::ostream& stream, const NamespaceString& nss) {
return stream << nss.toString();
}
} // namespace mongo
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