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
113
114
|
// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////
#ifndef TINK_INTERNAL_PARAMETERS_PARSER_H_
#define TINK_INTERNAL_PARAMETERS_PARSER_H_
#include <functional>
#include <memory>
#include <string>
#include <typeindex>
#include <utility>
#include "absl/status/status.h"
#include "absl/strings/string_view.h"
#include "tink/internal/parser_index.h"
#include "tink/internal/serialization.h"
#include "tink/parameters.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace internal {
// Non-template base class that can be used with internal registry map.
class ParametersParser {
public:
// Parses `serialization` into a parameters object.
//
// This function is usually called on a `Serialization` subclass matching the
// value returned by `ObjectIdentifier()`. However, implementations should
// verify that this is the case.
virtual util::StatusOr<std::unique_ptr<Parameters>> ParseParameters(
const Serialization& serialization) const = 0;
// Returns the object identifier for `SerializationT`, which is only valid
// for the lifetime of this object.
//
// The object identifier is a unique identifier per registry for this object
// (in the standard proto serialization, it is the type URL). In other words,
// when registering a `ParametersParser`, the registry will invoke this to get
// the handled object identifier. In order to parse an object of
// `SerializationT`, the registry will then obtain the object identifier of
// this serialization object, and call the parser corresponding to this
// object.
virtual absl::string_view ObjectIdentifier() const = 0;
// Returns an index that can be used to look up the `ParametersParser`
// object registered for the `ParametersT` type in a registry.
virtual ParserIndex Index() const = 0;
virtual ~ParametersParser() = default;
};
// Parses `SerializationT` objects into `ParametersT` objects.
template <typename SerializationT, typename ParametersT>
class ParametersParserImpl : public ParametersParser {
public:
explicit ParametersParserImpl(
absl::string_view object_identifier,
const std::function<util::StatusOr<ParametersT>(SerializationT)>&
function)
: object_identifier_(object_identifier), function_(function) {}
util::StatusOr<std::unique_ptr<Parameters>> ParseParameters(
const Serialization& serialization) const override {
if (serialization.ObjectIdentifier() != object_identifier_) {
return util::Status(
absl::StatusCode::kInvalidArgument,
"Invalid object identifier for this parameters parser.");
}
const SerializationT* st =
dynamic_cast<const SerializationT*>(&serialization);
if (st == nullptr) {
return util::Status(
absl::StatusCode::kInvalidArgument,
"Invalid serialization type for this parameters parser.");
}
util::StatusOr<ParametersT> parameters = function_(*st);
if (!parameters.ok()) return parameters.status();
return {absl::make_unique<ParametersT>(std::move(*parameters))};
}
absl::string_view ObjectIdentifier() const override {
return object_identifier_;
}
ParserIndex Index() const override {
return ParserIndex::Create<SerializationT>(object_identifier_);
}
private:
std::string object_identifier_;
std::function<util::StatusOr<ParametersT>(SerializationT)> function_;
};
} // namespace internal
} // namespace tink
} // namespace crypto
#endif // TINK_INTERNAL_PARAMETERS_PARSER_H_
|
