1
2
3
4
5
6
7
8
9
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
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/pipeline/field_path.h"
#include "mongo/base/string_data.h"
#include "mongo/bson/bson_depth.h"
#include "mongo/util/str.h"
#include "mongo/util/string_map.h"
namespace mongo {
namespace {
const StringDataSet kAllowedDollarPrefixedFields = {
// For DBRef
"$id"_sd,
"$ref"_sd,
"$db"_sd,
// Metadata fields.
// TODO SERVER-42560: It may be possible to eliminate some of these, if they're only used for
// creating the "dependency" projection. Some of them ($dis and $sortKey) may be used in
// sharded queries and are necessary.
"$sortKey",
"$pt",
"$dis",
"$textScore",
"$recordId",
// Used internally for forcing projections to be of a certain type.
"$__INTERNAL_QUERY_PROJECTION_RESERVED"};
} // namespace
using std::string;
using std::vector;
string FieldPath::getFullyQualifiedPath(StringData prefix, StringData suffix) {
if (prefix.empty()) {
return suffix.toString();
}
return str::stream() << prefix << "." << suffix;
}
FieldPath::FieldPath(std::string inputPath)
: _fieldPath(std::move(inputPath)), _fieldPathDotPosition{string::npos} {
uassert(40352, "FieldPath cannot be constructed with empty string", !_fieldPath.empty());
uassert(40353, "FieldPath must not end with a '.'.", _fieldPath[_fieldPath.size() - 1] != '.');
// Store index delimiter position for use in field lookup.
size_t dotPos;
size_t startPos = 0;
while (string::npos != (dotPos = _fieldPath.find('.', startPos))) {
_fieldPathDotPosition.push_back(dotPos);
startPos = dotPos + 1;
}
_fieldPathDotPosition.push_back(_fieldPath.size());
// Validate the path length and the fields.
const auto pathLength = getPathLength();
uassert(ErrorCodes::Overflow,
"FieldPath is too long",
pathLength <= BSONDepth::getMaxAllowableDepth());
for (size_t i = 0; i < pathLength; ++i) {
uassertValidFieldName(getFieldName(i));
}
}
void FieldPath::uassertValidFieldName(StringData fieldName) {
uassert(15998, "FieldPath field names may not be empty strings.", !fieldName.empty());
if (fieldName[0] == '$' && !kAllowedDollarPrefixedFields.count(fieldName)) {
uasserted(16410, "FieldPath field names may not start with '$'.");
}
uassert(
16411, "FieldPath field names may not contain '\0'.", fieldName.find('\0') == string::npos);
uassert(
16412, "FieldPath field names may not contain '.'.", fieldName.find('.') == string::npos);
}
} // namespace mongo
|
