mirror of
https://github.com/kidfromjupiter/nearby.git
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99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_
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#define THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_
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#include <string>
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#include <vector>
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#include "absl/container/flat_hash_map.h"
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#include "absl/container/flat_hash_set.h"
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#include "absl/status/status.h"
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#include "absl/status/statusor.h"
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#include "internal/platform/implementation/credential_callbacks.h"
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#include "internal/proto/credential.pb.h"
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#include "presence/data_element.h"
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#include "presence/scan_request.h"
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namespace nearby {
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namespace presence {
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struct Advertisement {
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uint8_t version = 0;
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std::vector<DataElement> data_elements;
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absl::StatusOr<internal::SharedCredential> public_credential =
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absl::NotFoundError("");
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internal::IdentityType identity_type = internal::IDENTITY_TYPE_UNSPECIFIED;
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std::string metadata_key;
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};
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// Decodes BLE NP advertisements
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class AdvertisementDecoder {
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public:
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AdvertisementDecoder(
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ScanRequest scan_request,
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absl::flat_hash_map<internal::IdentityType,
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std::vector<internal::SharedCredential>>* credentials)
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: scan_request_(scan_request), credentials_(credentials) {
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AddBannedDataTypes();
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}
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explicit AdvertisementDecoder(ScanRequest scan_request)
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: scan_request_(scan_request) {
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AddBannedDataTypes();
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}
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static std::vector<CredentialSelector> GetCredentialSelectors(
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const ScanRequest& scan_request);
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// Returns a list of Data Elements decoded from the advertisement.
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// Returns an error if the advertisement is misformatted or if it couldn't be
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// decrypted.
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absl::StatusOr<Advertisement> DecodeAdvertisement(
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absl::string_view advertisement);
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// Returns true if the decoded advertisement in `data_elements` matches the
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// filters in `scan_request`.
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bool MatchesScanFilter(const std::vector<DataElement>& data_elements);
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private:
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// Decrypts data elements stored inside encrypted `elem` and appends them to
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// `decoded_advertisement_`.
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absl::Status DecryptDataElements(const DataElement& elem);
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absl::StatusOr<std::string> Decrypt(absl::string_view salt,
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absl::string_view encrypted);
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void DecodeBaseTxAndAction(absl::string_view serialized_action);
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absl::StatusOr<std::string> DecryptLdt(
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const std::vector<internal::SharedCredential>& credentials,
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absl::string_view salt, absl::string_view data_elements);
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void AddBannedDataTypes();
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bool MatchesScanFilter(const std::vector<DataElement>& data_elements,
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const PresenceScanFilter& filter);
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bool MatchesScanFilter(const std::vector<DataElement>& data_elements,
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const LegacyPresenceScanFilter& filter);
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ScanRequest scan_request_;
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absl::flat_hash_map<internal::IdentityType,
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std::vector<internal::SharedCredential>>* credentials_ =
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nullptr;
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absl::flat_hash_set<int> banned_data_types_;
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Advertisement decoded_advertisement_;
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};
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} // namespace presence
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_
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