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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/renderer/variations_render_thread_observer.h"
#include "base/no_destructor.h"
#include "base/synchronization/lock.h"
#include "components/variations/net/variations_url_loader_throttle.h"
#include "content/public/renderer/render_thread.h"
#include "third_party/blink/public/common/associated_interfaces/associated_interface_registry.h"
namespace content {
namespace {
// VariationsRenderThreadObserver is mostly used on the main thread but
// GetVariationsHeader can be called from worker threads (e.g. for service
// workers) necessitating locking.
class VariationsData {
public:
void SetVariationsHeaders(
variations::mojom::VariationsHeadersPtr variations_headers) {
base::AutoLock lock(lock_);
variations_headers_ = std::move(variations_headers);
}
// Deliberately returns a copy.
variations::mojom::VariationsHeadersPtr GetVariationsHeaders() const {
base::AutoLock lock(lock_);
return variations_headers_.Clone();
}
private:
mutable base::Lock lock_;
// Stores variations headers that may be appended to eligible requests to
// Google web properties. For more details, see GetClientDataHeaders() in
// variations_ids_provider.h.
variations::mojom::VariationsHeadersPtr variations_headers_ GUARDED_BY(lock_);
};
VariationsData* GetVariationsData() {
static base::NoDestructor<VariationsData> variations_data;
return variations_data.get();
}
} // namespace
VariationsRenderThreadObserver::VariationsRenderThreadObserver() = default;
VariationsRenderThreadObserver::~VariationsRenderThreadObserver() = default;
// static
void VariationsRenderThreadObserver::AppendThrottleIfNeeded(
const url::Origin& top_frame_origin,
std::vector<std::unique_ptr<blink::URLLoaderThrottle>>* throttles) {
variations::mojom::VariationsHeadersPtr variations_headers =
GetVariationsData()->GetVariationsHeaders();
if (!variations_headers.is_null()) {
throttles->push_back(
std::make_unique<variations::VariationsURLLoaderThrottle>(
std::move(variations_headers), top_frame_origin));
}
}
void VariationsRenderThreadObserver::RegisterMojoInterfaces(
blink::AssociatedInterfaceRegistry* associated_interfaces) {
associated_interfaces->AddInterface<
mojom::RendererVariationsConfiguration>(base::BindRepeating(
&VariationsRenderThreadObserver::OnRendererConfigurationAssociatedRequest,
base::Unretained(this)));
}
void VariationsRenderThreadObserver::UnregisterMojoInterfaces(
blink::AssociatedInterfaceRegistry* associated_interfaces) {
associated_interfaces->RemoveInterface(
mojom::RendererVariationsConfiguration::Name_);
}
void VariationsRenderThreadObserver::SetVariationsHeaders(
variations::mojom::VariationsHeadersPtr variations_headers) {
GetVariationsData()->SetVariationsHeaders(std::move(variations_headers));
}
void VariationsRenderThreadObserver::SetFieldTrialGroup(
const std::string& trial_name,
const std::string& group_name) {
content::RenderThread::Get()->SetFieldTrialGroup(trial_name, group_name);
}
void VariationsRenderThreadObserver::OnRendererConfigurationAssociatedRequest(
mojo::PendingAssociatedReceiver<mojom::RendererVariationsConfiguration>
receiver) {
renderer_configuration_receiver_.reset();
renderer_configuration_receiver_.Bind(std::move(receiver));
}
} // namespace content
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