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// insert.cpp
/**
* Copyright (C) 2008 10gen 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/db/ops/insert.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/logical_time.h"
#include "mongo/db/views/durable_view_catalog.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::string;
using namespace mongoutils;
StatusWith<BSONObj> fixDocumentForInsert(ServiceContext* service, const BSONObj& doc) {
if (doc.objsize() > BSONObjMaxUserSize)
return StatusWith<BSONObj>(ErrorCodes::BadValue,
str::stream() << "object to insert too large"
<< ". size in bytes: "
<< doc.objsize()
<< ", max size: "
<< BSONObjMaxUserSize);
bool firstElementIsId = false;
bool hasTimestampToFix = false;
bool hadId = false;
{
BSONObjIterator i(doc);
for (bool isFirstElement = true; i.more(); isFirstElement = false) {
BSONElement e = i.next();
if (e.type() == bsonTimestamp && e.timestampValue() == 0) {
// we replace Timestamp(0,0) at the top level with a correct value
// in the fast pass, we just mark that we want to swap
hasTimestampToFix = true;
}
auto fieldName = e.fieldNameStringData();
if (fieldName[0] == '$') {
return StatusWith<BSONObj>(
ErrorCodes::BadValue,
str::stream() << "Document can't have $ prefixed field names: " << fieldName);
}
// check no regexp for _id (SERVER-9502)
// also, disallow undefined and arrays
// Make sure _id isn't duplicated (SERVER-19361).
if (fieldName == "_id") {
if (e.type() == RegEx) {
return StatusWith<BSONObj>(ErrorCodes::BadValue, "can't use a regex for _id");
}
if (e.type() == Undefined) {
return StatusWith<BSONObj>(ErrorCodes::BadValue,
"can't use a undefined for _id");
}
if (e.type() == Array) {
return StatusWith<BSONObj>(ErrorCodes::BadValue, "can't use an array for _id");
}
if (e.type() == Object) {
BSONObj o = e.Obj();
Status s = o.storageValidEmbedded();
if (!s.isOK())
return StatusWith<BSONObj>(s);
}
if (hadId) {
return StatusWith<BSONObj>(ErrorCodes::BadValue,
"can't have multiple _id fields in one document");
} else {
hadId = true;
firstElementIsId = isFirstElement;
}
}
}
}
if (firstElementIsId && !hasTimestampToFix)
return StatusWith<BSONObj>(BSONObj());
BSONObjIterator i(doc);
BSONObjBuilder b(doc.objsize() + 16);
if (firstElementIsId) {
b.append(doc.firstElement());
i.next();
} else {
BSONElement e = doc["_id"];
if (e.type()) {
b.append(e);
} else {
b.appendOID("_id", NULL, true);
}
}
while (i.more()) {
BSONElement e = i.next();
if (hadId && e.fieldNameStringData() == "_id") {
// no-op
} else if (e.type() == bsonTimestamp && e.timestampValue() == 0) {
auto nextTime = LogicalClock::get(service)->reserveTicks(1);
b.append(e.fieldName(), nextTime.asTimestamp());
} else {
b.append(e);
}
}
return StatusWith<BSONObj>(b.obj());
}
Status userAllowedWriteNS(StringData ns) {
return userAllowedWriteNS(nsToDatabaseSubstring(ns), nsToCollectionSubstring(ns));
}
Status userAllowedWriteNS(const NamespaceString& ns) {
return userAllowedWriteNS(ns.db(), ns.coll());
}
Status userAllowedWriteNS(StringData db, StringData coll) {
if (coll == "system.profile") {
return Status(ErrorCodes::InvalidNamespace,
str::stream() << "cannot write to '" << db << ".system.profile'");
}
return userAllowedCreateNS(db, coll);
}
Status userAllowedCreateNS(StringData db, StringData coll) {
// validity checking
if (db.size() == 0)
return Status(ErrorCodes::InvalidNamespace, "db cannot be blank");
if (!NamespaceString::validDBName(db, NamespaceString::DollarInDbNameBehavior::Allow))
return Status(ErrorCodes::InvalidNamespace, "invalid db name");
if (coll.size() == 0)
return Status(ErrorCodes::InvalidNamespace, "collection cannot be blank");
if (!NamespaceString::validCollectionName(coll))
return Status(ErrorCodes::InvalidNamespace, "invalid collection name");
if (db.size() + 1 /* dot */ + coll.size() > NamespaceString::MaxNsCollectionLen)
return Status(ErrorCodes::InvalidNamespace,
str::stream() << "fully qualified namespace " << db << '.' << coll
<< " is too long "
<< "(max is "
<< NamespaceString::MaxNsCollectionLen
<< " bytes)");
// check spceial areas
if (db == "system")
return Status(ErrorCodes::InvalidNamespace, "cannot use 'system' database");
if (coll.startsWith("system.")) {
if (coll == "system.indexes")
return Status::OK();
if (coll == "system.js")
return Status::OK();
if (coll == "system.profile")
return Status::OK();
if (coll == "system.users")
return Status::OK();
if (coll == DurableViewCatalog::viewsCollectionName())
return Status::OK();
if (db == "admin") {
if (coll == "system.version")
return Status::OK();
if (coll == "system.roles")
return Status::OK();
if (coll == "system.new_users")
return Status::OK();
if (coll == "system.backup_users")
return Status::OK();
}
if (db == "local") {
if (coll == "system.replset")
return Status::OK();
}
return Status(ErrorCodes::InvalidNamespace,
str::stream() << "cannot write to '" << db << "." << coll << "'");
}
// some special rules
if (coll.find(".system.") != string::npos) {
// this matches old (2.4 and older) behavior, but I'm not sure its a good idea
return Status(ErrorCodes::BadValue,
str::stream() << "cannot write to '" << db << "." << coll << "'");
}
return Status::OK();
}
}
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