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// Copyright 2025 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/bookmarkbar_preload/bookmarkbar_preload_pipeline.h"
#include "base/metrics/histogram_functions.h"
#include "chrome/browser/preloading/chrome_preloading.h"
#include "chrome/browser/preloading/preloading_features.h"
#include "chrome/browser/preloading/prerender/prerender_utils.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/search_engines/template_url_service_factory.h"
#include "components/page_load_metrics/browser/navigation_handle_user_data.h"
#include "components/search_engines/template_url.h"
#include "components/search_engines/template_url_service.h"
#include "content/public/browser/preloading_data.h"
#include "content/public/browser/preloading_trigger_type.h"
#include "content/public/browser/web_contents.h"
namespace {
const char kHistogramPrerenderBookmarkBarIsPrerenderingSrpUrl[] =
"Prerender.IsPrerenderingSRPUrl.Embedder_BookmarkBar";
void AttachBookmarkBarNavigationHandleUserData(
content::NavigationHandle& navigation_handle) {
page_load_metrics::NavigationHandleUserData::CreateForNavigationHandle(
navigation_handle, page_load_metrics::NavigationHandleUserData::
InitiatorLocation::kBookmarkBar);
}
bool IsSearchUrl(content::WebContents& web_contents, const GURL& url) {
auto* profile = Profile::FromBrowserContext(web_contents.GetBrowserContext());
TemplateURLService* template_url_service =
TemplateURLServiceFactory::GetForProfile(profile);
return template_url_service &&
template_url_service->IsSearchResultsPageFromDefaultSearchProvider(
url);
}
} // namespace
BookmarkBarPreloadPipeline::BookmarkBarPreloadPipeline(GURL url)
: pipeline_info_(content::PreloadPipelineInfo::Create(
/*planned_max_preloading_type=*/content::PreloadingType::kPrerender)),
url_(std::move(url)) {}
BookmarkBarPreloadPipeline::~BookmarkBarPreloadPipeline() = default;
bool BookmarkBarPreloadPipeline::StartPrerender(
content::WebContents& web_contents,
content::PreloadingPredictor predictor) {
// Helpers to create content::PreloadingAttempt.
auto* preloading_data =
content::PreloadingData::GetOrCreateForWebContents(&web_contents);
content::PreloadingURLMatchCallback same_url_matcher =
content::PreloadingData::GetSameURLMatcher(url_);
if (prerender_handle_ && prerender_handle_->IsValid()) {
return true;
}
bool is_search_url = IsSearchUrl(web_contents, url_);
base::UmaHistogramBoolean(kHistogramPrerenderBookmarkBarIsPrerenderingSrpUrl,
is_search_url);
// Create new PreloadingAttempt and pass all the values corresponding to
// this prerendering attempt for Prerender.
content::PreloadingAttempt* preloading_attempt =
preloading_data->AddPreloadingAttempt(
predictor, content::PreloadingType::kPrerender,
std::move(same_url_matcher),
web_contents.GetPrimaryMainFrame()->GetPageUkmSourceId());
if (is_search_url) {
preloading_attempt->SetEligibility(ToPreloadingEligibility(
ChromePreloadingEligibility::KDisallowSearchUrl));
return false;
}
// BookmarkBar only allows https protocol.
if (!url_.SchemeIs("https")) {
preloading_attempt->SetEligibility(
content::PreloadingEligibility::kHttpsOnly);
return false;
}
base::RepeatingCallback<void(content::NavigationHandle&)>
prerender_navigation_handle_callback =
base::BindRepeating(&AttachBookmarkBarNavigationHandleUserData);
prerender_handle_ = web_contents.StartPrerendering(
url_, content::PreloadingTriggerType::kEmbedder,
prerender_utils::kBookmarkBarMetricSuffix,
/*additional_headers=*/net::HttpRequestHeaders(),
/*no_vary_search_hint=*/std::nullopt,
ui::PageTransitionFromInt(ui::PAGE_TRANSITION_AUTO_BOOKMARK),
/*should_warm_up_compositor=*/
base::FeatureList::IsEnabled(
features::kPrerender2WarmUpCompositorForBookmarkBar),
/*should_prepare_paint_tree=*/false,
content::PreloadingHoldbackStatus::kUnspecified, pipeline_info_,
preloading_attempt,
/*url_match_predicate=*/{},
std::move(prerender_navigation_handle_callback));
return prerender_handle_ != nullptr;
}
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