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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <algorithm>
#include "components/unified_consent/consent_throttle.h"
#include "base/functional/bind.h"
#include "base/time/time.h"
#include "components/unified_consent/url_keyed_data_collection_consent_helper.h"
namespace unified_consent {
namespace {
void FulfillRequestCallback(
UrlKeyedDataCollectionConsentHelper::State consent_state,
ConsentThrottle::RequestCallback callback) {
DCHECK_NE(consent_state,
UrlKeyedDataCollectionConsentHelper::State::kInitializing);
std::move(callback).Run(consent_state ==
UrlKeyedDataCollectionConsentHelper::State::kEnabled);
}
} // namespace
ConsentThrottle::ConsentThrottle(
std::unique_ptr<unified_consent::UrlKeyedDataCollectionConsentHelper>
consent_helper,
base::TimeDelta timeout)
: consent_helper_(std::move(consent_helper)), timeout_(timeout) {
DCHECK(consent_helper_);
handle_observation_.Observe(consent_helper_.get());
}
ConsentThrottle::~ConsentThrottle() = default;
void ConsentThrottle::OnUrlKeyedDataCollectionConsentStateChanged(
UrlKeyedDataCollectionConsentHelper* consent_helper) {
DCHECK_EQ(consent_helper, consent_helper_.get());
auto consent_state = consent_helper->GetConsentState();
if (consent_state ==
UrlKeyedDataCollectionConsentHelper::State::kInitializing) {
return;
}
request_processing_timer_.Stop();
// The request callbacks can modify the vector while running. Swap the vector
// onto the stack to prevent crashing. https://crbug.com/1483454.
std::vector<RequestCallback> callbacks;
std::swap(callbacks, enqueued_request_callbacks_);
for (auto& request_callback : callbacks) {
FulfillRequestCallback(consent_state, std::move(request_callback));
}
}
void ConsentThrottle::EnqueueRequest(RequestCallback callback) {
auto consent_state = consent_helper_->GetConsentState();
if (consent_state !=
UrlKeyedDataCollectionConsentHelper::State::kInitializing) {
FulfillRequestCallback(consent_state, std::move(callback));
return;
}
enqueued_request_callbacks_.emplace_back(std::move(callback));
if (!request_processing_timer_.IsRunning()) {
request_processing_timer_.Start(
FROM_HERE, timeout_,
base::BindOnce(
&ConsentThrottle::OnTimeoutExpired,
// Unretained usage here okay, because this object owns the timer.
base::Unretained(this)));
}
}
void ConsentThrottle::OnTimeoutExpired() {
CHECK_EQ(consent_helper_->GetConsentState(),
UrlKeyedDataCollectionConsentHelper::State::kInitializing);
// The request callbacks can modify the vector while running. Swap the vector
// onto the stack to prevent crashing. https://crbug.com/1483454.
std::vector<RequestCallback> callbacks;
std::swap(callbacks, enqueued_request_callbacks_);
for (auto& request_callback : callbacks) {
std::move(request_callback).Run(false);
}
}
} // namespace unified_consent
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