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1 // Copyright (c) 2012 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 "content/browser/geolocation/location_arbitrator_impl.h" | |
6 | |
7 #include <map> | |
8 | |
9 #include "base/bind.h" | |
10 #include "base/bind_helpers.h" | |
11 #include "base/memory/ptr_util.h" | |
12 #include "build/build_config.h" | |
13 #include "content/browser/geolocation/network_location_provider.h" | |
14 #include "content/public/browser/access_token_store.h" | |
15 #include "content/public/browser/geolocation_delegate.h" | |
16 #include "content/public/common/content_client.h" | |
17 #include "url/gurl.h" | |
18 | |
19 namespace content { | |
20 namespace { | |
21 | |
22 const char* kDefaultNetworkProviderUrl = | |
23 "https://www.googleapis.com/geolocation/v1/geolocate"; | |
24 } // namespace | |
25 | |
26 // To avoid oscillations, set this to twice the expected update interval of a | |
27 // a GPS-type location provider (in case it misses a beat) plus a little. | |
28 const int64_t LocationArbitratorImpl::kFixStaleTimeoutMilliseconds = | |
29 11 * base::Time::kMillisecondsPerSecond; | |
30 | |
31 LocationArbitratorImpl::LocationArbitratorImpl( | |
32 const LocationUpdateCallback& callback, | |
33 GeolocationDelegate* delegate) | |
34 : delegate_(delegate), | |
35 arbitrator_update_callback_(callback), | |
36 provider_update_callback_( | |
37 base::Bind(&LocationArbitratorImpl::OnLocationUpdate, | |
38 base::Unretained(this))), | |
39 position_provider_(nullptr), | |
40 is_permission_granted_(false), | |
41 is_running_(false) {} | |
42 | |
43 LocationArbitratorImpl::~LocationArbitratorImpl() { | |
44 } | |
45 | |
46 GURL LocationArbitratorImpl::DefaultNetworkProviderURL() { | |
47 return GURL(kDefaultNetworkProviderUrl); | |
48 } | |
49 | |
50 void LocationArbitratorImpl::OnPermissionGranted() { | |
51 is_permission_granted_ = true; | |
52 for (const auto& provider : providers_) | |
53 provider->OnPermissionGranted(); | |
54 } | |
55 | |
56 void LocationArbitratorImpl::StartProviders(bool enable_high_accuracy) { | |
57 // Stash options as OnAccessTokenStoresLoaded has not yet been called. | |
58 is_running_ = true; | |
59 enable_high_accuracy_ = enable_high_accuracy; | |
60 | |
61 if (providers_.empty()) { | |
62 RegisterSystemProvider(); | |
63 | |
64 const scoped_refptr<AccessTokenStore> access_token_store = | |
65 GetAccessTokenStore(); | |
66 if (access_token_store && delegate_->UseNetworkLocationProviders()) { | |
67 DCHECK(DefaultNetworkProviderURL().is_valid()); | |
68 token_store_callback_.Reset( | |
69 base::Bind(&LocationArbitratorImpl::OnAccessTokenStoresLoaded, | |
70 base::Unretained(this))); | |
71 access_token_store->LoadAccessTokens(token_store_callback_.callback()); | |
72 return; | |
73 } | |
74 } | |
75 DoStartProviders(); | |
76 } | |
77 | |
78 void LocationArbitratorImpl::DoStartProviders() { | |
79 if (providers_.empty()) { | |
80 // If no providers are available, we report an error to avoid | |
81 // callers waiting indefinitely for a reply. | |
82 Geoposition position; | |
83 position.error_code = Geoposition::ERROR_CODE_PERMISSION_DENIED; | |
84 arbitrator_update_callback_.Run(position); | |
85 return; | |
86 } | |
87 for (const auto& provider : providers_) | |
88 provider->StartProvider(enable_high_accuracy_); | |
89 } | |
90 | |
91 void LocationArbitratorImpl::StopProviders() { | |
92 // Reset the reference location state (provider+position) | |
93 // so that future starts use fresh locations from | |
94 // the newly constructed providers. | |
95 position_provider_ = nullptr; | |
96 position_ = Geoposition(); | |
97 | |
98 providers_.clear(); | |
99 is_running_ = false; | |
100 } | |
101 | |
102 void LocationArbitratorImpl::OnAccessTokenStoresLoaded( | |
103 AccessTokenStore::AccessTokenMap access_token_map, | |
104 const scoped_refptr<net::URLRequestContextGetter>& context_getter) { | |
105 // If there are no access tokens, boot strap it with the default server URL. | |
106 if (access_token_map.empty()) | |
107 access_token_map[DefaultNetworkProviderURL()]; | |
108 for (const auto& entry : access_token_map) { | |
109 RegisterProvider(NewNetworkLocationProvider( | |
110 GetAccessTokenStore(), context_getter, entry.first, entry.second)); | |
111 } | |
112 DoStartProviders(); | |
113 } | |
114 | |
115 void LocationArbitratorImpl::RegisterProvider( | |
116 std::unique_ptr<LocationProvider> provider) { | |
117 if (!provider) | |
118 return; | |
119 provider->SetUpdateCallback(provider_update_callback_); | |
120 if (is_permission_granted_) | |
121 provider->OnPermissionGranted(); | |
122 providers_.push_back(std::move(provider)); | |
123 } | |
124 | |
125 void LocationArbitratorImpl::RegisterSystemProvider() { | |
126 std::unique_ptr<LocationProvider> provider = | |
127 delegate_->OverrideSystemLocationProvider(); | |
128 if (!provider) | |
129 provider = NewSystemLocationProvider(); | |
130 RegisterProvider(std::move(provider)); | |
131 } | |
132 | |
133 void LocationArbitratorImpl::OnLocationUpdate(const LocationProvider* provider, | |
134 const Geoposition& new_position) { | |
135 DCHECK(new_position.Validate() || | |
136 new_position.error_code != Geoposition::ERROR_CODE_NONE); | |
137 if (!IsNewPositionBetter(position_, new_position, | |
138 provider == position_provider_)) | |
139 return; | |
140 position_provider_ = provider; | |
141 position_ = new_position; | |
142 arbitrator_update_callback_.Run(position_); | |
143 } | |
144 | |
145 scoped_refptr<AccessTokenStore> LocationArbitratorImpl::NewAccessTokenStore() { | |
146 return delegate_->CreateAccessTokenStore(); | |
147 } | |
148 | |
149 scoped_refptr<AccessTokenStore> LocationArbitratorImpl::GetAccessTokenStore() { | |
150 if (!access_token_store_) | |
151 access_token_store_ = NewAccessTokenStore(); | |
152 return access_token_store_; | |
153 } | |
154 | |
155 std::unique_ptr<LocationProvider> | |
156 LocationArbitratorImpl::NewNetworkLocationProvider( | |
157 const scoped_refptr<AccessTokenStore>& access_token_store, | |
158 const scoped_refptr<net::URLRequestContextGetter>& context, | |
159 const GURL& url, | |
160 const base::string16& access_token) { | |
161 #if defined(OS_ANDROID) | |
162 // Android uses its own SystemLocationProvider. | |
163 return nullptr; | |
164 #else | |
165 return base::WrapUnique(new NetworkLocationProvider( | |
166 access_token_store, context, url, access_token)); | |
167 #endif | |
168 } | |
169 | |
170 std::unique_ptr<LocationProvider> | |
171 LocationArbitratorImpl::NewSystemLocationProvider() { | |
172 #if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX) | |
173 return nullptr; | |
174 #else | |
175 return content::NewSystemLocationProvider(); | |
176 #endif | |
177 } | |
178 | |
179 base::Time LocationArbitratorImpl::GetTimeNow() const { | |
180 return base::Time::Now(); | |
181 } | |
182 | |
183 bool LocationArbitratorImpl::IsNewPositionBetter( | |
184 const Geoposition& old_position, const Geoposition& new_position, | |
185 bool from_same_provider) const { | |
186 // Updates location_info if it's better than what we currently have, | |
187 // or if it's a newer update from the same provider. | |
188 if (!old_position.Validate()) { | |
189 // Older location wasn't locked. | |
190 return true; | |
191 } | |
192 if (new_position.Validate()) { | |
193 // New location is locked, let's check if it's any better. | |
194 if (old_position.accuracy >= new_position.accuracy) { | |
195 // Accuracy is better. | |
196 return true; | |
197 } else if (from_same_provider) { | |
198 // Same provider, fresher location. | |
199 return true; | |
200 } else if ((GetTimeNow() - old_position.timestamp).InMilliseconds() > | |
201 kFixStaleTimeoutMilliseconds) { | |
202 // Existing fix is stale. | |
203 return true; | |
204 } | |
205 } | |
206 return false; | |
207 } | |
208 | |
209 bool LocationArbitratorImpl::HasPermissionBeenGranted() const { | |
210 return is_permission_granted_; | |
211 } | |
212 | |
213 } // namespace content | |
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