mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
// Copyright 2023 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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#include "sharing/nearby_sharing_util.h"
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#include <cstdint>
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#include <optional>
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#include <string>
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#include <vector>
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#include "absl/hash/hash.h"
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#include "absl/strings/escaping.h"
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#include "absl/strings/str_cat.h"
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#include "absl/strings/string_view.h"
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#include "proto/sharing_enums.pb.h"
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#include "sharing/advertisement.h"
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#include "sharing/certificates/nearby_share_decrypted_public_certificate.h"
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#include "sharing/common/nearby_share_enums.h"
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#include "sharing/internal/base/encode.h"
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#include "sharing/internal/public/logging.h"
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namespace nearby::sharing {
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std::string PowerLevelToString(PowerLevel level) {
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switch (level) {
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case PowerLevel::kLowPower:
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return "LOW_POWER";
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case PowerLevel::kMediumPower:
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return "MEDIUM_POWER";
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case PowerLevel::kHighPower:
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return "HIGH_POWER";
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case PowerLevel::kUnknown:
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return "UNKNOWN";
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}
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}
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std::optional<std::vector<uint8_t>> GetBluetoothMacAddressFromCertificate(
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const NearbyShareDecryptedPublicCertificate& certificate) {
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if (!certificate.unencrypted_metadata().has_bluetooth_mac_address()) {
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LOG(WARNING) << __func__ << ": Public certificate "
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<< nearby::utils::HexEncode(certificate.id())
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<< " did not contain a Bluetooth mac address.";
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return std::nullopt;
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}
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std::string mac_address =
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certificate.unencrypted_metadata().bluetooth_mac_address();
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if (mac_address.size() != 6) {
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LOG(ERROR) << __func__ << ": Invalid bluetooth mac address: '"
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<< mac_address << "'";
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return std::nullopt;
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}
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return std::vector<uint8_t>(mac_address.begin(), mac_address.end());
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}
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std::optional<std::string> GetDeviceName(
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const Advertisement& advertisement,
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const std::optional<NearbyShareDecryptedPublicCertificate>& certificate) {
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// Device name is always included when visible to everyone.
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if (advertisement.device_name().has_value()) {
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return advertisement.device_name();
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}
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// For contacts only advertisements, we can't do anything without the
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// certificate.
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if (!certificate.has_value() ||
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!certificate->unencrypted_metadata().has_device_name()) {
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return std::nullopt;
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}
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return certificate->unencrypted_metadata().device_name();
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}
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// Return the most stable device identifier with the following priority:
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// 1. Hash of Bluetooth MAC address.
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// 2. Certificate ID.
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// 3. Endpoint ID.
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std::string GetDeviceId(
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absl::string_view endpoint_id,
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const std::optional<NearbyShareDecryptedPublicCertificate>& certificate) {
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if (!certificate.has_value()) {
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return std::string(endpoint_id);
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}
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std::optional<std::vector<uint8_t>> mac_address =
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GetBluetoothMacAddressFromCertificate(*certificate);
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if (mac_address.has_value()) {
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return absl::StrCat(absl::Hash<std::vector<uint8_t>>{}(*mac_address));
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}
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if (!certificate->id().empty()) {
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return absl::BytesToHexString(absl::string_view(
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reinterpret_cast<const char*>(certificate->id().data()),
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certificate->id().size()));
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}
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return std::string(endpoint_id);
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}
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} // namespace nearby::sharing
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