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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "chromeos/components/tether/host_scan_device_prioritizer.h" |
| 6 |
| 7 #include "base/memory/ptr_util.h" |
| 8 #include "base/values.h" |
| 9 #include "chromeos/components/tether/pref_names.h" |
| 10 #include "components/prefs/pref_registry_simple.h" |
| 11 #include "components/prefs/pref_service.h" |
| 12 |
| 13 namespace chromeos { |
| 14 |
| 15 namespace tether { |
| 16 |
| 17 // static |
| 18 void HostScanDevicePrioritizer::RegisterPrefs(PrefRegistrySimple* registry) { |
| 19 registry->RegisterListPref(prefs::kMostRecentTetherAvailablilityResponderIds); |
| 20 registry->RegisterStringPref(prefs::kMostRecentConnectTetheringResponderId, |
| 21 ""); |
| 22 } |
| 23 |
| 24 HostScanDevicePrioritizer::HostScanDevicePrioritizer(PrefService* pref_service) |
| 25 : pref_service_(pref_service) {} |
| 26 |
| 27 HostScanDevicePrioritizer::~HostScanDevicePrioritizer() {} |
| 28 |
| 29 void HostScanDevicePrioritizer::RecordSuccessfulTetherAvailabilityResponse( |
| 30 const cryptauth::RemoteDevice& remote_device) { |
| 31 std::string device_id = remote_device.GetDeviceId(); |
| 32 |
| 33 const base::ListValue* ids = |
| 34 pref_service_->GetList(prefs::kMostRecentTetherAvailablilityResponderIds); |
| 35 |
| 36 // Create a mutable copy of the stored IDs, or create one if it has yet to be |
| 37 // stored. |
| 38 std::unique_ptr<base::ListValue> updated_ids = |
| 39 ids ? ids->CreateDeepCopy() : base::MakeUnique<base::ListValue>(); |
| 40 |
| 41 // Remove the device ID if it was already present in the list. |
| 42 std::unique_ptr<base::Value> device_id_value = |
| 43 base::MakeUnique<base::Value>(device_id); |
| 44 updated_ids->Remove(*device_id_value, nullptr); |
| 45 |
| 46 // Add the device ID to the front of the queue. |
| 47 updated_ids->Insert(0, std::move(device_id_value)); |
| 48 |
| 49 // Store the updated list back in |pref_service_|. |
| 50 pref_service_->Set(prefs::kMostRecentTetherAvailablilityResponderIds, |
| 51 *updated_ids); |
| 52 } |
| 53 |
| 54 void HostScanDevicePrioritizer::RecordSuccessfulConnectTetheringResponse( |
| 55 const cryptauth::RemoteDevice& remote_device) { |
| 56 pref_service_->Set(prefs::kMostRecentConnectTetheringResponderId, |
| 57 base::Value(remote_device.GetDeviceId())); |
| 58 } |
| 59 |
| 60 void HostScanDevicePrioritizer::SortByHostScanOrder( |
| 61 std::vector<cryptauth::RemoteDevice>* remote_devices) const { |
| 62 // Fetch the stored IDs associated with the devices which most recently sent |
| 63 // TetherAvailabilityResponses. |
| 64 const base::ListValue* tether_availability_ids = |
| 65 pref_service_->GetList(prefs::kMostRecentTetherAvailablilityResponderIds); |
| 66 |
| 67 // Create a mutable copy of the stored IDs, or create one if it has yet to be |
| 68 // stored. |
| 69 std::unique_ptr<base::ListValue> prioritized_ids = |
| 70 tether_availability_ids ? tether_availability_ids->CreateDeepCopy() |
| 71 : base::MakeUnique<base::ListValue>(); |
| 72 |
| 73 // Now, fetch the ID associated with the device which most recently sent a |
| 74 // ConnectTetheringRequest. |
| 75 std::string connect_tethering_id = |
| 76 pref_service_->GetString(prefs::kMostRecentConnectTetheringResponderId); |
| 77 |
| 78 // If an ID exists, insert it at the front of |prioritized_ids|. |
| 79 if (!connect_tethering_id.empty()) { |
| 80 prioritized_ids->Insert( |
| 81 0, base::MakeUnique<base::Value>(connect_tethering_id)); |
| 82 } |
| 83 |
| 84 // Iterate from the last stored ID to the first stored ID. This ensures that |
| 85 // the items at the front of the list end up in the front of the prioritized |
| 86 // |remote_devices| vector. |
| 87 for (size_t i = prioritized_ids->GetSize(); i-- > 0;) { |
| 88 base::Value* stored_id_value; |
| 89 if (!prioritized_ids->Get(i, &stored_id_value)) { |
| 90 continue; |
| 91 } |
| 92 |
| 93 std::string stored_id; |
| 94 if (!stored_id_value->GetAsString(&stored_id)) { |
| 95 continue; |
| 96 } |
| 97 |
| 98 // Iterate through |remote_devices| to see if a device exists with a |
| 99 // device ID of |stored_id|. If one exists, remove it from its previous |
| 100 // position in the list and add it at the front instead. |
| 101 for (auto it = remote_devices->begin(); it != remote_devices->end(); ++it) { |
| 102 if (it->GetDeviceId() != stored_id) { |
| 103 continue; |
| 104 } |
| 105 |
| 106 cryptauth::RemoteDevice device_to_move = *it; |
| 107 remote_devices->erase(it); |
| 108 remote_devices->insert(remote_devices->begin(), device_to_move); |
| 109 break; |
| 110 } |
| 111 } |
| 112 } |
| 113 |
| 114 } // namespace tether |
| 115 |
| 116 } // namespace chromeos |
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