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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/browsing_topics/browsing_topics_page_load_data_tracker.h"
#include "base/containers/contains.h"
#include "base/metrics/histogram_functions.h"
#include "components/browsing_topics/util.h"
#include "components/history/content/browser/history_context_helper.h"
#include "components/history/core/browser/history_service.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browsing_topics_site_data_manager.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/browser/web_contents.h"
#include "services/metrics/public/cpp/metrics_utils.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "services/metrics/public/cpp/ukm_recorder.h"
#include "services/network/public/mojom/permissions_policy/permissions_policy_feature.mojom.h"
#include "third_party/blink/public/common/features.h"
namespace browsing_topics {
// Max number of context domains to keep track of per page load to limit in-use
// memory. This should also be greater than
// `kBrowsingTopicsMaxNumberOfApiUsageContextDomainsToStorePerPageLoad`.
constexpr int kMaxNumberOfContextDomainsToMonitor = 1000;
BrowsingTopicsPageLoadDataTracker::~BrowsingTopicsPageLoadDataTracker() {
if (observed_hashed_context_domains_.empty())
return;
// TODO(yaoxia): consider also recording metrics when the Chrome app goes into
// background, in which case the destructor may never be called.
ukm::UkmRecorder* ukm_recorder = ukm::UkmRecorder::Get();
ukm::builders::BrowsingTopics_PageLoad builder(source_id_);
builder.SetTopicsRequestingContextDomainsCount(
ukm::GetExponentialBucketMinForCounts1000(
observed_hashed_context_domains_.size()));
builder.Record(ukm_recorder->Get());
}
BrowsingTopicsPageLoadDataTracker::BrowsingTopicsPageLoadDataTracker(
content::Page& page)
: BrowsingTopicsPageLoadDataTracker(
page,
/*redirect_hosts_with_topics_invoked=*/{},
/*source_id_before_redirects=*/
page.GetMainDocument().GetPageUkmSourceId()) {}
BrowsingTopicsPageLoadDataTracker::BrowsingTopicsPageLoadDataTracker(
content::Page& page,
std::set<HashedHost> redirect_hosts_with_topics_invoked,
ukm::SourceId source_id_before_redirects)
: content::PageUserData<BrowsingTopicsPageLoadDataTracker>(page),
hashed_main_frame_host_(HashMainFrameHostForStorage(
page.GetMainDocument().GetLastCommittedOrigin().host())),
redirect_hosts_with_topics_invoked_(
std::move(redirect_hosts_with_topics_invoked)),
source_id_before_redirects_(source_id_before_redirects) {
source_id_ = page.GetMainDocument().GetPageUkmSourceId();
// TODO(yaoxia): consider dropping the permissions policy checks. We require
// that the API is used in the page, and that already implies that the
// permissions policy is allowed.
if ((page.GetMainDocument().IsLastCommitIPAddressPubliclyRoutable() ||
base::FeatureList::IsEnabled(
blink::features::kBrowsingTopicsBypassIPIsPubliclyRoutableCheck)) &&
page.GetMainDocument().IsFeatureEnabled(
network::mojom::PermissionsPolicyFeature::kBrowsingTopics) &&
page.GetMainDocument().IsFeatureEnabled(
network::mojom::PermissionsPolicyFeature::
kBrowsingTopicsBackwardCompatible) &&
page.GetMainDocument().IsLastCrossDocumentNavigationStartedByUser()) {
eligible_to_observe_ = true;
}
}
void BrowsingTopicsPageLoadDataTracker::OnBrowsingTopicsApiUsed(
const HashedDomain& hashed_context_domain,
const std::string& context_domain,
history::HistoryService* history_service,
bool observe) {
CHECK(page().IsPrimary());
if (!topics_invoked_) {
if (redirect_hosts_with_topics_invoked_.size() < 5) {
bool host_inserted =
redirect_hosts_with_topics_invoked_.insert(hashed_main_frame_host_)
.second;
if (host_inserted) {
// If this is the first Topics call on the page, and this site wasn't
// part of a previous redirect chain that invoked Topics, record the
// number of distinct sites in the current redirect chain (including
// this page) that have called Topics, capped at 5. This ensures each
// count (from 1 to the maximum count) is emitted exactly once per
// redirect chain.
int kExclusiveMaxBucket = 6;
base::UmaHistogramExactLinear(
"BrowsingTopics.RedirectChain.OnTopicsFirstInvokedForSite."
"TopicsCallingSitesCount",
redirect_hosts_with_topics_invoked_.size(), kExclusiveMaxBucket);
}
}
topics_invoked_ = true;
}
if (!observe || !eligible_to_observe_) {
return;
}
// On the first Topics observation in the page, set the allowed bit in
// history.
if (observed_hashed_context_domains_.empty()) {
content::WebContents* web_contents =
content::WebContents::FromRenderFrameHost(&page().GetMainDocument());
history_service->SetBrowsingTopicsAllowed(
history::ContextIDForWebContents(web_contents),
web_contents->GetController().GetLastCommittedEntry()->GetUniqueID(),
web_contents->GetLastCommittedURL());
}
CHECK_LE(
blink::features::
kBrowsingTopicsMaxNumberOfApiUsageContextDomainsToStorePerPageLoad
.Get(),
kMaxNumberOfContextDomainsToMonitor);
// Cap the number of context domains to keep track of per page load to limit
// in-use memory.
if (observed_hashed_context_domains_.size() >=
kMaxNumberOfContextDomainsToMonitor) {
return;
}
bool is_new_domain =
observed_hashed_context_domains_.insert(hashed_context_domain).second;
// Ignore this context if we've already added it.
if (!is_new_domain)
return;
// Cap the number of context domains to store to disk per page load to limit
// disk memory usage.
if (observed_hashed_context_domains_.size() >
static_cast<size_t>(
blink::features::
kBrowsingTopicsMaxNumberOfApiUsageContextDomainsToStorePerPageLoad
.Get())) {
return;
}
// Persist the usage now rather than at the end of the page load, as when the
// app enters background, it may be killed without further notification.
page()
.GetMainDocument()
.GetBrowserContext()
->GetDefaultStoragePartition()
->GetBrowsingTopicsSiteDataManager()
->OnBrowsingTopicsApiUsed(hashed_main_frame_host_, hashed_context_domain,
context_domain, base::Time::Now());
}
PAGE_USER_DATA_KEY_IMPL(BrowsingTopicsPageLoadDataTracker);
} // namespace browsing_topics
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