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| 1 // Copyright (c) 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 "chrome/browser/media/router/discovery/discovery_network_monitor.h" |
| 6 |
| 7 #include <unordered_set> |
| 8 |
| 9 #include "base/lazy_instance.h" |
| 10 #include "base/logging.h" |
| 11 #include "base/sha1.h" |
| 12 #include "base/strings/string_number_conversions.h" |
| 13 #include "base/strings/string_util.h" |
| 14 #include "chrome/browser/media/router/discovery/discovery_network_list.h" |
| 15 #include "net/base/network_interfaces.h" |
| 16 |
| 17 namespace { |
| 18 |
| 19 using content::BrowserThread; |
| 20 |
| 21 std::string ComputeNetworkId( |
| 22 const std::vector<DiscoveryNetworkInfo>& network_info_list) { |
| 23 DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| 24 |
| 25 if (network_info_list.size() == 0) { |
| 26 return DiscoveryNetworkMonitor::kNetworkIdDisconnected; |
| 27 } |
| 28 if (std::find_if(network_info_list.begin(), network_info_list.end(), |
| 29 [](const DiscoveryNetworkInfo& network_info) { |
| 30 return network_info.network_id.size() > 0; |
| 31 }) == network_info_list.end()) { |
| 32 return DiscoveryNetworkMonitor::kNetworkIdUnknown; |
| 33 } |
| 34 |
| 35 std::string combined_ids; |
| 36 for (const auto& network_info : network_info_list) { |
| 37 combined_ids = combined_ids + "!" + network_info.network_id; |
| 38 } |
| 39 |
| 40 std::string hash = base::SHA1HashString(combined_ids); |
| 41 return base::ToLowerASCII(base::HexEncode(hash.data(), hash.length())); |
| 42 } |
| 43 |
| 44 std::vector<DiscoveryNetworkInfo> GetNetworkInfo() { |
| 45 DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| 46 return GetDiscoveryNetworkInfoList(); |
| 47 } |
| 48 |
| 49 base::LazyInstance<DiscoveryNetworkMonitor>::Leaky g_discovery_monitor; |
| 50 |
| 51 } // namespace |
| 52 |
| 53 // static |
| 54 constexpr char const DiscoveryNetworkMonitor::kNetworkIdDisconnected[]; |
| 55 // static |
| 56 constexpr char const DiscoveryNetworkMonitor::kNetworkIdUnknown[]; |
| 57 |
| 58 // static |
| 59 DiscoveryNetworkMonitor* DiscoveryNetworkMonitor::GetInstance() { |
| 60 return g_discovery_monitor.Pointer(); |
| 61 } |
| 62 |
| 63 void DiscoveryNetworkMonitor::RebindNetworkChangeObserverForTest() { |
| 64 net::NetworkChangeNotifier::AddNetworkChangeObserver(this); |
| 65 } |
| 66 |
| 67 void DiscoveryNetworkMonitor::SetNetworkInfoFunctionForTest( |
| 68 NetworkInfoFunction strategy) { |
| 69 network_info_function_ = strategy; |
| 70 } |
| 71 |
| 72 void DiscoveryNetworkMonitor::AddObserver(Observer* const observer) { |
| 73 observers_->AddObserver(observer); |
| 74 } |
| 75 |
| 76 void DiscoveryNetworkMonitor::RemoveObserver(Observer* const observer) { |
| 77 observers_->RemoveObserver(observer); |
| 78 } |
| 79 |
| 80 void DiscoveryNetworkMonitor::Refresh(NetworkRefreshCompleteCallback callback) { |
| 81 BrowserThread::PostTaskAndReply( |
| 82 BrowserThread::IO, FROM_HERE, |
| 83 base::BindOnce(&DiscoveryNetworkMonitor::UpdateNetworkInfo, |
| 84 base::Unretained(this)), |
| 85 std::move(callback)); |
| 86 } |
| 87 |
| 88 const std::string& DiscoveryNetworkMonitor::GetNetworkId() const { |
| 89 DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| 90 return network_id_; |
| 91 } |
| 92 |
| 93 DiscoveryNetworkMonitor::DiscoveryNetworkMonitor() |
| 94 : network_id_(kNetworkIdDisconnected), |
| 95 observers_(new base::ObserverListThreadSafe<Observer>( |
| 96 base::ObserverListThreadSafe< |
| 97 Observer>::NotificationType::NOTIFY_EXISTING_ONLY)), |
| 98 network_info_function_(&GetNetworkInfo) { |
| 99 net::NetworkChangeNotifier::AddNetworkChangeObserver(this); |
| 100 } |
| 101 |
| 102 DiscoveryNetworkMonitor::~DiscoveryNetworkMonitor() { |
| 103 net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this); |
| 104 } |
| 105 |
| 106 void DiscoveryNetworkMonitor::OnNetworkChanged( |
| 107 net::NetworkChangeNotifier::ConnectionType) { |
| 108 BrowserThread::PostTask( |
| 109 BrowserThread::IO, FROM_HERE, |
| 110 base::Bind(&DiscoveryNetworkMonitor::UpdateNetworkInfo, |
| 111 base::Unretained(this))); |
| 112 } |
| 113 |
| 114 void DiscoveryNetworkMonitor::UpdateNetworkInfo() { |
| 115 DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| 116 |
| 117 auto network_info_list = network_info_function_(); |
| 118 auto network_id = ComputeNetworkId(network_info_list); |
| 119 |
| 120 network_id_.swap(network_id); |
| 121 |
| 122 if (network_id_ != network_id) { |
| 123 observers_->Notify(FROM_HERE, &Observer::OnNetworksChanged, |
| 124 base::ConstRef(*this)); |
| 125 } |
| 126 } |
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