Index: content/browser/geolocation/location_arbitrator_impl.cc |
diff --git a/content/browser/geolocation/location_arbitrator_impl.cc b/content/browser/geolocation/location_arbitrator_impl.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..44d911f7aeadfb6078f4623bd193583096a9ab68 |
--- /dev/null |
+++ b/content/browser/geolocation/location_arbitrator_impl.cc |
@@ -0,0 +1,213 @@ |
+// Copyright (c) 2012 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "content/browser/geolocation/location_arbitrator_impl.h" |
+ |
+#include <map> |
+ |
+#include "base/bind.h" |
+#include "base/bind_helpers.h" |
+#include "base/memory/ptr_util.h" |
+#include "build/build_config.h" |
+#include "content/browser/geolocation/network_location_provider.h" |
+#include "content/public/browser/access_token_store.h" |
+#include "content/public/browser/geolocation_delegate.h" |
+#include "content/public/common/content_client.h" |
+#include "url/gurl.h" |
+ |
+namespace content { |
+namespace { |
+ |
+const char* kDefaultNetworkProviderUrl = |
+ "https://www.googleapis.com/geolocation/v1/geolocate"; |
+} // namespace |
+ |
+// To avoid oscillations, set this to twice the expected update interval of a |
+// a GPS-type location provider (in case it misses a beat) plus a little. |
+const int64_t LocationArbitratorImpl::kFixStaleTimeoutMilliseconds = |
+ 11 * base::Time::kMillisecondsPerSecond; |
+ |
+LocationArbitratorImpl::LocationArbitratorImpl( |
+ const LocationUpdateCallback& callback, |
+ GeolocationDelegate* delegate) |
+ : delegate_(delegate), |
+ arbitrator_update_callback_(callback), |
+ provider_update_callback_( |
+ base::Bind(&LocationArbitratorImpl::OnLocationUpdate, |
+ base::Unretained(this))), |
+ position_provider_(nullptr), |
+ is_permission_granted_(false), |
+ is_running_(false) {} |
+ |
+LocationArbitratorImpl::~LocationArbitratorImpl() { |
+} |
+ |
+GURL LocationArbitratorImpl::DefaultNetworkProviderURL() { |
+ return GURL(kDefaultNetworkProviderUrl); |
+} |
+ |
+void LocationArbitratorImpl::OnPermissionGranted() { |
+ is_permission_granted_ = true; |
+ for (const auto& provider : providers_) |
+ provider->OnPermissionGranted(); |
+} |
+ |
+void LocationArbitratorImpl::StartProviders(bool enable_high_accuracy) { |
+ // Stash options as OnAccessTokenStoresLoaded has not yet been called. |
+ is_running_ = true; |
+ enable_high_accuracy_ = enable_high_accuracy; |
+ |
+ if (providers_.empty()) { |
+ RegisterSystemProvider(); |
+ |
+ const scoped_refptr<AccessTokenStore> access_token_store = |
+ GetAccessTokenStore(); |
+ if (access_token_store && delegate_->UseNetworkLocationProviders()) { |
+ DCHECK(DefaultNetworkProviderURL().is_valid()); |
+ token_store_callback_.Reset( |
+ base::Bind(&LocationArbitratorImpl::OnAccessTokenStoresLoaded, |
+ base::Unretained(this))); |
+ access_token_store->LoadAccessTokens(token_store_callback_.callback()); |
+ return; |
+ } |
+ } |
+ DoStartProviders(); |
+} |
+ |
+void LocationArbitratorImpl::DoStartProviders() { |
+ if (providers_.empty()) { |
+ // If no providers are available, we report an error to avoid |
+ // callers waiting indefinitely for a reply. |
+ Geoposition position; |
+ position.error_code = Geoposition::ERROR_CODE_PERMISSION_DENIED; |
+ arbitrator_update_callback_.Run(position); |
+ return; |
+ } |
+ for (const auto& provider : providers_) |
+ provider->StartProvider(enable_high_accuracy_); |
+} |
+ |
+void LocationArbitratorImpl::StopProviders() { |
+ // Reset the reference location state (provider+position) |
+ // so that future starts use fresh locations from |
+ // the newly constructed providers. |
+ position_provider_ = nullptr; |
+ position_ = Geoposition(); |
+ |
+ providers_.clear(); |
+ is_running_ = false; |
+} |
+ |
+void LocationArbitratorImpl::OnAccessTokenStoresLoaded( |
+ AccessTokenStore::AccessTokenMap access_token_map, |
+ const scoped_refptr<net::URLRequestContextGetter>& context_getter) { |
+ // If there are no access tokens, boot strap it with the default server URL. |
+ if (access_token_map.empty()) |
+ access_token_map[DefaultNetworkProviderURL()]; |
+ for (const auto& entry : access_token_map) { |
+ RegisterProvider(NewNetworkLocationProvider( |
+ GetAccessTokenStore(), context_getter, entry.first, entry.second)); |
+ } |
+ DoStartProviders(); |
+} |
+ |
+void LocationArbitratorImpl::RegisterProvider( |
+ std::unique_ptr<LocationProvider> provider) { |
+ if (!provider) |
+ return; |
+ provider->SetUpdateCallback(provider_update_callback_); |
+ if (is_permission_granted_) |
+ provider->OnPermissionGranted(); |
+ providers_.push_back(std::move(provider)); |
+} |
+ |
+void LocationArbitratorImpl::RegisterSystemProvider() { |
+ std::unique_ptr<LocationProvider> provider = |
+ delegate_->OverrideSystemLocationProvider(); |
+ if (!provider) |
+ provider = NewSystemLocationProvider(); |
+ RegisterProvider(std::move(provider)); |
+} |
+ |
+void LocationArbitratorImpl::OnLocationUpdate(const LocationProvider* provider, |
+ const Geoposition& new_position) { |
+ DCHECK(new_position.Validate() || |
+ new_position.error_code != Geoposition::ERROR_CODE_NONE); |
+ if (!IsNewPositionBetter(position_, new_position, |
+ provider == position_provider_)) |
+ return; |
+ position_provider_ = provider; |
+ position_ = new_position; |
+ arbitrator_update_callback_.Run(position_); |
+} |
+ |
+scoped_refptr<AccessTokenStore> LocationArbitratorImpl::NewAccessTokenStore() { |
+ return delegate_->CreateAccessTokenStore(); |
+} |
+ |
+scoped_refptr<AccessTokenStore> LocationArbitratorImpl::GetAccessTokenStore() { |
+ if (!access_token_store_) |
+ access_token_store_ = NewAccessTokenStore(); |
+ return access_token_store_; |
+} |
+ |
+std::unique_ptr<LocationProvider> |
+LocationArbitratorImpl::NewNetworkLocationProvider( |
+ const scoped_refptr<AccessTokenStore>& access_token_store, |
+ const scoped_refptr<net::URLRequestContextGetter>& context, |
+ const GURL& url, |
+ const base::string16& access_token) { |
+#if defined(OS_ANDROID) |
+ // Android uses its own SystemLocationProvider. |
+ return nullptr; |
+#else |
+ return base::WrapUnique(new NetworkLocationProvider( |
+ access_token_store, context, url, access_token)); |
+#endif |
+} |
+ |
+std::unique_ptr<LocationProvider> |
+LocationArbitratorImpl::NewSystemLocationProvider() { |
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX) |
+ return nullptr; |
+#else |
+ return content::NewSystemLocationProvider(); |
+#endif |
+} |
+ |
+base::Time LocationArbitratorImpl::GetTimeNow() const { |
+ return base::Time::Now(); |
+} |
+ |
+bool LocationArbitratorImpl::IsNewPositionBetter( |
+ const Geoposition& old_position, const Geoposition& new_position, |
+ bool from_same_provider) const { |
+ // Updates location_info if it's better than what we currently have, |
+ // or if it's a newer update from the same provider. |
+ if (!old_position.Validate()) { |
+ // Older location wasn't locked. |
+ return true; |
+ } |
+ if (new_position.Validate()) { |
+ // New location is locked, let's check if it's any better. |
+ if (old_position.accuracy >= new_position.accuracy) { |
+ // Accuracy is better. |
+ return true; |
+ } else if (from_same_provider) { |
+ // Same provider, fresher location. |
+ return true; |
+ } else if ((GetTimeNow() - old_position.timestamp).InMilliseconds() > |
+ kFixStaleTimeoutMilliseconds) { |
+ // Existing fix is stale. |
+ return true; |
+ } |
+ } |
+ return false; |
+} |
+ |
+bool LocationArbitratorImpl::HasPermissionBeenGranted() const { |
+ return is_permission_granted_; |
+} |
+ |
+} // namespace content |