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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/feed/core/v2/user_actions_collector.h"
#include <algorithm>
#include <cmath>
#include <string>
#include "base/base64.h"
#include "base/json/values_util.h"
#include "base/logging.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "base/time/default_clock.h"
#include "base/time/time.h"
#include "components/feed/core/common/pref_names.h"
#include "components/feed/core/proto/v2/user_actions_store.pb.h"
#include "components/feed/core/v2/config.h"
#include "components/feed/core/v2/prefs.h"
#include "components/feed/core/v2/public/common_enums.h"
#include "components/feed/core/v2/public/feed_api.h"
#include "components/feed/feed_feature_list.h"
#include "components/prefs/pref_service.h"
#include "url/gurl.h"
#include "url/origin.h"
namespace feed {
namespace {
int64_t TimeToPrefValue(const base::Time& time) {
return time.ToDeltaSinceWindowsEpoch().InSeconds();
}
base::Time PrefValueToTime(int64_t value) {
return base::Time::FromDeltaSinceWindowsEpoch(base::Seconds(value));
}
} // namespace
// TODO: Hook up to browser clearing data delegate so we clear the pref when
// user clears data from Chrome settings.
UserActionsCollector::UserActionsCollector(PrefService* profile_prefs)
: profile_prefs_(profile_prefs) {
if (!base::FeatureList::IsEnabled(kPersonalizeFeedUnsignedUsers))
return;
InitStoreFromPrefs();
}
UserActionsCollector::~UserActionsCollector() = default;
void UserActionsCollector::UpdateUserProfileOnLinkClick(
const GURL& url,
const std::vector<int64_t>& entity_mids) {
if (!base::FeatureList::IsEnabled(kPersonalizeFeedUnsignedUsers))
return;
if (!url.is_valid() || !url.SchemeIsHTTPOrHTTPS() || entity_mids.empty())
return;
visit_metadata_string_list_pref_.Append(EntryToString(url, entity_mids));
profile_prefs_->SetList(prefs::kFeedOnDeviceUserActionsCollector,
visit_metadata_string_list_pref_.Clone());
profile_prefs_->SchedulePendingLossyWrites();
UMA_HISTOGRAM_COUNTS(
"ContentSuggestions.Feed.UnsignedUserPersonalization.LinkClicked", 1);
}
void UserActionsCollector::InitStoreFromPrefs() {
const base::Value::List& list_value_from_disk =
profile_prefs_->GetList(prefs::kFeedOnDeviceUserActionsCollector);
size_t count_values_during_store_initialization = 0;
const size_t entries_in_pref = list_value_from_disk.size();
// If the store size exceeds its capacity, then skip some of the earlier
// entries to reduce store size to its capacity.
int entries_to_skip =
entries_in_pref > GetFeedConfig().max_url_entries_in_cache
? entries_in_pref - GetFeedConfig().max_url_entries_in_cache
: 0;
DCHECK_GE(entries_to_skip, 0);
DCHECK_LE(static_cast<size_t>(entries_to_skip), entries_in_pref);
bool rewrite_prefs = entries_to_skip > 0;
// Skip first |entries_to_skip| number of entries to reduce the size of
// store.
for (auto iter = list_value_from_disk.begin() + entries_to_skip;
iter != list_value_from_disk.end(); ++iter) {
if (!iter->is_string()) {
rewrite_prefs = true;
continue;
}
const std::string& visit_metadata_serialized = iter->GetString();
if (!ShouldIncludeVisitMetadataEntry(visit_metadata_serialized)) {
rewrite_prefs = true;
continue;
}
++count_values_during_store_initialization;
visit_metadata_string_list_pref_.Append(visit_metadata_serialized);
}
UMA_HISTOGRAM_COUNTS(
"ContentSuggestions.Feed.UnsignedUserPersonalization."
"CountValuesDuringStoreInitialization",
count_values_during_store_initialization);
if (rewrite_prefs) {
profile_prefs_->SetList(prefs::kFeedOnDeviceUserActionsCollector,
visit_metadata_string_list_pref_.Clone());
profile_prefs_->SchedulePendingLossyWrites();
}
}
std::string UserActionsCollector::EntryToString(
const GURL& url,
const std::vector<int64_t>& entity_mids) const {
feedunsignedpersonalizationstore::VisitMetadata visit_metadata_proto;
url::Origin origin = url::Origin::Create(url);
visit_metadata_proto.set_timestamp_seconds_since_epoch(
TimeToPrefValue(base::Time::Now()));
visit_metadata_proto.set_origin(origin.Serialize());
DCHECK(!entity_mids.empty());
for (size_t i = 0; i < entity_mids.size() &&
i < GetFeedConfig().max_mid_entities_per_url_entry;
++i) {
visit_metadata_proto.add_entity_mids(entity_mids[i]);
}
std::string serialized_entry;
visit_metadata_proto.SerializeToString(&serialized_entry);
DCHECK(!serialized_entry.empty());
return base::Base64Encode(serialized_entry);
}
bool UserActionsCollector::ShouldIncludeVisitMetadataEntry(
const std::string& visit_metadata_serialized) const {
if (visit_metadata_serialized.empty())
return false;
std::string base64_decoded;
if (!base::Base64Decode(visit_metadata_serialized, &base64_decoded)) {
return false;
}
feedunsignedpersonalizationstore::VisitMetadata entry_proto;
if (!entry_proto.ParseFromString(base64_decoded)) {
return false;
}
// TODO(tbansal): Consider throwing out entries from the future.
base::Time timestamp =
PrefValueToTime(entry_proto.timestamp_seconds_since_epoch());
if (base::Time::Now() - timestamp >= base::Days(28)) {
return false;
}
return true;
}
} // namespace feed
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