mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 15:16:12 -04:00
Janusz Sobczak
a92abac83a
1. Update the API to accept the credentials on input instead of credential manager. 2. Update the test with values using the LDT encryption. These changes allow us to have a more asynchronous implementaion. When broadcasting we can: 1. Fetch the private credentials asynchronously. 2. Create the advertisement and start broadcasting when the credentials have been fetched. When scanning we can: 1. Fetch public credentials asynchronously. 2. Start scanning for advertisements. 3. Update the decoder when new credentials are fetched. PiperOrigin-RevId: 493998041
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::PublicCredential> 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::PublicCredential>>* 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::PublicCredential>& 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::PublicCredential>>* 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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