mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
100 lines
3.6 KiB
C++
100 lines
3.6 KiB
C++
// 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
|
|
//
|
|
// https://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 THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_
|
|
#define THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_
|
|
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include "absl/container/flat_hash_map.h"
|
|
#include "absl/container/flat_hash_set.h"
|
|
#include "absl/status/status.h"
|
|
#include "absl/status/statusor.h"
|
|
#include "internal/platform/implementation/credential_callbacks.h"
|
|
#include "internal/proto/credential.pb.h"
|
|
#include "presence/data_element.h"
|
|
#include "presence/scan_request.h"
|
|
|
|
namespace nearby {
|
|
namespace presence {
|
|
|
|
struct Advertisement {
|
|
uint8_t version = 0;
|
|
std::vector<DataElement> data_elements;
|
|
absl::StatusOr<internal::SharedCredential> public_credential =
|
|
absl::NotFoundError("");
|
|
internal::IdentityType identity_type = internal::IDENTITY_TYPE_UNSPECIFIED;
|
|
std::string metadata_key;
|
|
};
|
|
|
|
// Decodes BLE NP advertisements
|
|
class AdvertisementDecoder {
|
|
public:
|
|
using IdentityType = ::nearby::internal::IdentityType;
|
|
|
|
AdvertisementDecoder(
|
|
ScanRequest scan_request,
|
|
absl::flat_hash_map<IdentityType,
|
|
std::vector<internal::SharedCredential>>* credentials)
|
|
: scan_request_(scan_request), credentials_(credentials) {
|
|
AddBannedDataTypes();
|
|
}
|
|
|
|
explicit AdvertisementDecoder(ScanRequest scan_request)
|
|
: scan_request_(scan_request) {
|
|
AddBannedDataTypes();
|
|
}
|
|
|
|
static std::vector<CredentialSelector> GetCredentialSelectors(
|
|
const ScanRequest& scan_request);
|
|
|
|
// Returns a list of Data Elements decoded from the advertisement.
|
|
// Returns an error if the advertisement is misformatted or if it couldn't be
|
|
// decrypted.
|
|
absl::StatusOr<Advertisement> DecodeAdvertisement(
|
|
absl::string_view advertisement);
|
|
|
|
// Returns true if the decoded advertisement in `data_elements` matches the
|
|
// filters in `scan_request`.
|
|
bool MatchesScanFilter(const std::vector<DataElement>& data_elements);
|
|
|
|
private:
|
|
// Decrypts data elements stored inside encrypted `elem` and appends them to
|
|
// `decoded_advertisement_`.
|
|
absl::Status DecryptDataElements(const DataElement& elem);
|
|
absl::StatusOr<std::string> Decrypt(absl::string_view salt,
|
|
absl::string_view encrypted);
|
|
void DecodeBaseTxAndAction(absl::string_view serialized_action);
|
|
absl::StatusOr<std::string> DecryptLdt(
|
|
const std::vector<internal::SharedCredential>& credentials,
|
|
absl::string_view salt, absl::string_view data_elements);
|
|
void AddBannedDataTypes();
|
|
bool MatchesScanFilter(const std::vector<DataElement>& data_elements,
|
|
const PresenceScanFilter& filter);
|
|
bool MatchesScanFilter(const std::vector<DataElement>& data_elements,
|
|
const LegacyPresenceScanFilter& filter);
|
|
|
|
ScanRequest scan_request_;
|
|
absl::flat_hash_map<IdentityType, std::vector<internal::SharedCredential>>*
|
|
credentials_ = nullptr;
|
|
absl::flat_hash_set<int> banned_data_types_;
|
|
Advertisement decoded_advertisement_;
|
|
};
|
|
|
|
} // namespace presence
|
|
} // namespace nearby
|
|
|
|
#endif // THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_
|