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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/preloading/prefetch/chrome_prefetch_manager.h"
#include "chrome/browser/preloading/chrome_preloading.h"
#include "content/public/browser/preload_pipeline_info.h"
#include "content/public/browser/preloading_data.h"
#include "content/public/common/content_features.h"
#include "net/http/http_no_vary_search_data.h"
#include "third_party/blink/public/mojom/loader/referrer.mojom.h"
#if BUILDFLAG(IS_ANDROID)
#include "chrome/browser/flags/android/chrome_feature_list.h"
#endif // BUILDFLAG(IS_ANDROID)
#if BUILDFLAG(IS_ANDROID)
constexpr size_t kMaxNumberOfCCTPrefetches = 50;
#endif // BUILDFLAG(IS_ANDROID)
ChromePrefetchManager::~ChromePrefetchManager() = default;
#if BUILDFLAG(IS_ANDROID)
void ChromePrefetchManager::StartPrefetchFromCCT(
const GURL& prefetch_url,
bool use_prefetch_proxy,
const std::optional<url::Origin>& referring_origin) {
if (!base::FeatureList::IsEnabled(
chrome::android::kCCTNavigationalPrefetch)) {
return;
}
auto* preloading_data =
content::PreloadingData::GetOrCreateForWebContents(&GetWebContents());
// Normally, prefetch uses `PrefetchServiceMatcher` for the NVS-aware matching
// for `is_accurate_triggering_` performed on
// `PreloadingDataImpl::DidStartNavigation`, but since CCT prefetch doesn't
// support NVS, `SameURLMatcher` is sufficient here.
content::PreloadingURLMatchCallback matcher =
content::PreloadingData::GetSameURLMatcher(prefetch_url);
// Regarding `triggering_primary_page_source_id`: Since the CCT prefetch's
// trigger is Android App, it should be `ukm::kInvalidSourceId` (And if so,
// `Preloading.Attempt.PreviousPrimaryPage` will not be recorded).
content::PreloadingAttempt* preloading_attempt =
preloading_data->AddPreloadingAttempt(
chrome_preloading_predictor::kChromeCustomTabs,
content::PreloadingType::kPrefetch, std::move(matcher),
/*triggering_primary_page_source_id=*/ukm::kInvalidSourceId);
content::PreloadingHoldbackStatus holdback_status_override =
content::PreloadingHoldbackStatus::kUnspecified;
if (chrome::android::kCCTNavigationalPrefetchHoldback.Get()) {
holdback_status_override = content::PreloadingHoldbackStatus::kHoldback;
}
// TODO(crbug.com/40288091): Specify appropriate referrer value that comes
// from CCT.
std::unique_ptr<content::PrefetchHandle> prefetch_handle =
GetWebContents().StartPrefetch(
prefetch_url, use_prefetch_proxy, kCCTMetricsSuffix,
blink::mojom::Referrer(), referring_origin,
/*no_vary_search_hint=*/std::nullopt,
/*priority=*/std::nullopt,
content::PreloadPipelineInfo::Create(
/*planned_max_preloading_type=*/content::PreloadingType::
kPrefetch),
preloading_attempt->GetWeakPtr(), holdback_status_override,
/*ttl=*/std::nullopt);
if (prefetch_handle) {
if (all_prefetches_.size() >= kMaxNumberOfCCTPrefetches) {
all_prefetches_.pop_front();
}
all_prefetches_.push_back(std::move(prefetch_handle));
}
}
#endif // BUILDFLAG(IS_ANDROID)
ChromePrefetchManager::ChromePrefetchManager(content::WebContents* web_contents)
: content::WebContentsUserData<ChromePrefetchManager>(*web_contents) {}
WEB_CONTENTS_USER_DATA_KEY_IMPL(ChromePrefetchManager);
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