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/**
* Copyright (C) 2013 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/>.
*/
#include "mongo/db/ops/field_checker.h"
#include "mongo/base/error_codes.h"
#include "mongo/db/field_ref.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using mongoutils::str::stream;
namespace fieldchecker {
namespace {
Status isUpdatable(const FieldRef& field, bool legacy) {
const size_t numParts = field.numParts();
if (numParts == 0) {
return Status(ErrorCodes::BadValue, "cannot update an empty field name");
}
for (size_t i = 0; i != numParts; ++i) {
const StringData part = field.getPart(i);
if ((i == 0) && part.compare("_id") == 0) {
return Status(ErrorCodes::BadValue,
"update cannot affect the _id");
}
if (part.empty()) {
return Status(ErrorCodes::BadValue,
mongoutils::str::stream() << field.dottedField()
<< " contains empty fields");
}
if (!legacy && (part[0] == '$')) {
// A 'bare' dollar sign not in the first position is a positional
// update token, so it is not an error.
//
// TODO: In 'isPositional' below, we redo a very similar walk and check.
// Perhaps we should fuse these operations, and have isUpdatable take a
// 'PositionalContext' object to be populated with information about any
// discovered positional ops.
const bool positional = ((i != 0) && (part.size() == 1));
if (!positional) {
// We ignore the '$'-prefixed names that are part of a DBRef, because
// we don't have enough context here to validate that we have a proper
// DB ref. Errors with the DBRef will be caught upstream when
// okForStorage is invoked.
//
// TODO: We need to find a way to consolidate this checking with that
// done in okForStorage. There is too much duplication between this
// code and that code.
const bool mightBePartOfDbRef =
part.startsWith("$db") ||
part.startsWith("$id") ||
part.startsWith("$ref");
if (!mightBePartOfDbRef)
return Status(ErrorCodes::BadValue,
mongoutils::str::stream() << field.dottedField()
<< " contains field names with leading '$' character");
}
}
}
return Status::OK();
}
} // namespace
Status isUpdatable(const FieldRef& field) {
return isUpdatable(field, false);
}
Status isUpdatableLegacy(const FieldRef& field) {
return isUpdatable(field, true);
}
bool isPositional(const FieldRef& fieldRef, size_t* pos, size_t* count) {
// 'count' is optional.
size_t dummy;
if (count == NULL) {
count = &dummy;
}
*count = 0;
size_t size = fieldRef.numParts();
for (size_t i=0; i<size; i++) {
StringData fieldPart = fieldRef.getPart(i);
if ((fieldPart.size() == 1) && (fieldPart[0] == '$')) {
if (*count == 0) *pos = i;
(*count)++;
}
}
return *count > 0;
}
} // namespace fieldchecker
} // namespace mongo
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