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// 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 "content/browser/geolocation/network_location_provider.h"
#include "content/public/browser/access_token_store.h"
#include "content/public/browser/content_browser_client.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 LocationArbitratorImpl::kFixStaleTimeoutMilliseconds =
11 * base::Time::kMillisecondsPerSecond;
LocationArbitratorImpl::LocationArbitratorImpl(
const LocationUpdateCallback& callback)
: callback_(callback),
provider_callback_(
base::Bind(&LocationArbitratorImpl::LocationUpdateAvailable,
base::Unretained(this))),
position_provider_(NULL),
is_permission_granted_(false),
is_running_(false) {
}
LocationArbitratorImpl::~LocationArbitratorImpl() {
}
GURL LocationArbitratorImpl::DefaultNetworkProviderURL() {
return GURL(kDefaultNetworkProviderUrl);
}
void LocationArbitratorImpl::OnPermissionGranted() {
is_permission_granted_ = true;
for (ScopedVector<LocationProvider>::iterator i = providers_.begin();
i != providers_.end(); ++i) {
(*i)->OnPermissionGranted();
}
}
void LocationArbitratorImpl::StartProviders(bool use_high_accuracy) {
// Stash options as OnAccessTokenStoresLoaded has not yet been called.
is_running_ = true;
use_high_accuracy_ = use_high_accuracy;
if (providers_.empty()) {
DCHECK(DefaultNetworkProviderURL().is_valid());
GetAccessTokenStore()->LoadAccessTokens(
base::Bind(&LocationArbitratorImpl::OnAccessTokenStoresLoaded,
base::Unretained(this)));
} else {
DoStartProviders();
}
}
void LocationArbitratorImpl::DoStartProviders() {
for (ScopedVector<LocationProvider>::iterator i = providers_.begin();
i != providers_.end(); ++i) {
(*i)->StartProvider(use_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_ = NULL;
position_ = Geoposition();
providers_.clear();
is_running_ = false;
}
void LocationArbitratorImpl::OnAccessTokenStoresLoaded(
AccessTokenStore::AccessTokenSet access_token_set,
net::URLRequestContextGetter* context_getter) {
if (!is_running_ || !providers_.empty()) {
// A second StartProviders() call may have arrived before the first
// completed.
return;
}
// If there are no access tokens, boot strap it with the default server URL.
if (access_token_set.empty())
access_token_set[DefaultNetworkProviderURL()];
for (AccessTokenStore::AccessTokenSet::iterator i =
access_token_set.begin();
i != access_token_set.end(); ++i) {
RegisterProvider(
NewNetworkLocationProvider(
GetAccessTokenStore(), context_getter,
i->first, i->second));
}
LocationProvider* provider =
GetContentClient()->browser()->OverrideSystemLocationProvider();
if (!provider)
provider = NewSystemLocationProvider();
RegisterProvider(provider);
DoStartProviders();
}
void LocationArbitratorImpl::RegisterProvider(
LocationProvider* provider) {
if (!provider)
return;
provider->SetUpdateCallback(provider_callback_);
if (is_permission_granted_)
provider->OnPermissionGranted();
providers_.push_back(provider);
}
void LocationArbitratorImpl::LocationUpdateAvailable(
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;
callback_.Run(position_);
}
AccessTokenStore* LocationArbitratorImpl::NewAccessTokenStore() {
return GetContentClient()->browser()->CreateAccessTokenStore();
}
AccessTokenStore* LocationArbitratorImpl::GetAccessTokenStore() {
if (!access_token_store_.get())
access_token_store_ = NewAccessTokenStore();
return access_token_store_.get();
}
LocationProvider* LocationArbitratorImpl::NewNetworkLocationProvider(
AccessTokenStore* access_token_store,
net::URLRequestContextGetter* context,
const GURL& url,
const string16& access_token) {
#if defined(OS_ANDROID)
// Android uses its own SystemLocationProvider.
return NULL;
#else
return new NetworkLocationProvider(access_token_store, context, url,
access_token);
#endif
}
LocationProvider* LocationArbitratorImpl::NewSystemLocationProvider() {
#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
return NULL;
#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
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