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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/glic/host/context/glic_page_context_eligibility_observer.h"
#include "base/memory/ptr_util.h"
#include "base/task/single_thread_task_runner.h"
#include "chrome/browser/optimization_guide/optimization_guide_keyed_service.h"
#include "chrome/browser/optimization_guide/optimization_guide_keyed_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/tabs/public/tab_features.h"
#include "chrome/common/chrome_features.h"
#include "components/optimization_guide/core/optimization_guide_permissions_util.h"
#include "components/optimization_guide/core/optimization_metadata.h"
#include "components/optimization_guide/proto/glic_page_context_eligibility_metadata.pb.h"
#include "components/tabs/public/tab_interface.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/web_contents.h"
#include "mojo/public/cpp/bindings/callback_helpers.h"
namespace glic {
namespace {
bool GetIsEligible(const optimization_guide::OptimizationMetadata& metadata) {
auto eligibility_metadata = metadata.ParsedMetadata<
optimization_guide::proto::GlicPageContextEligibilityMetadata>();
if (!eligibility_metadata) {
return features::kGlicPageContextEligibilityAllowNoMetadata.Get();
}
// Otherwise, get the value from the specific metadata.
return eligibility_metadata->is_eligible();
}
} // namespace
// static
std::unique_ptr<GlicPageContextEligibilityObserver>
GlicPageContextEligibilityObserver::MaybeCreateForWebContents(
content::WebContents* web_contents) {
if (!base::FeatureList::IsEnabled(features::kGlicPageContextEligibility)) {
return nullptr;
}
Profile* profile =
Profile::FromBrowserContext(web_contents->GetBrowserContext());
OptimizationGuideKeyedService* optimization_guide_keyed_service =
OptimizationGuideKeyedServiceFactory::GetForProfile(profile);
if (!optimization_guide_keyed_service) {
return nullptr;
}
return base::WrapUnique(new GlicPageContextEligibilityObserver(
web_contents, optimization_guide_keyed_service));
}
GlicPageContextEligibilityObserver::GlicPageContextEligibilityObserver(
content::WebContents* web_contents,
OptimizationGuideKeyedService* optimization_guide_keyed_service)
: content::WebContentsObserver(web_contents),
optimization_guide_keyed_service_(optimization_guide_keyed_service) {
CHECK(optimization_guide_keyed_service_);
// Register to start fetching signals for page context eligibility.
// No-op if user is not permitted or already registered via another observer.
optimization_guide_keyed_service_->RegisterOptimizationTypes(
{optimization_guide::proto::GLIC_PAGE_CONTEXT_ELIGIBILITY});
}
// static
bool GlicPageContextEligibilityObserver::MaybeGetEligibilityForWebContents(
content::WebContents* web_contents,
base::OnceCallback<void(bool)> eligibility_callback) {
tabs::TabInterface* tab =
tabs::TabInterface::MaybeGetFromContents(web_contents);
if (!tab) {
return false;
}
tabs::TabFeatures* features = tab->GetTabFeatures();
if (!features) {
return false;
}
GlicPageContextEligibilityObserver* context_eligibility_observer =
features->glic_page_context_eligibility_observer();
if (!context_eligibility_observer) {
return false;
}
context_eligibility_observer->GetEligibility(
mojo::WrapCallbackWithDefaultInvokeIfNotRun(
std::move(eligibility_callback),
::features::kGlicPageContextEligibilityAllowNoMetadata.Get()));
return true;
}
GlicPageContextEligibilityObserver::~GlicPageContextEligibilityObserver() =
default;
void GlicPageContextEligibilityObserver::DidFinishNavigation(
content::NavigationHandle* navigation_handle) {
// Ignore sub-frame and uncommitted navigations.
if (!navigation_handle->IsInPrimaryMainFrame()) {
return;
}
if (!navigation_handle->HasCommitted()) {
return;
}
// Ignore fragment changes.
if (navigation_handle->GetPreviousPrimaryMainFrameURL().GetWithoutRef() ==
navigation_handle->GetURL().GetWithoutRef()) {
return;
}
// Reset state.
is_eligible_ = std::nullopt;
is_currently_waiting_ = false;
eligibility_callbacks_.clear();
// The answer from the page call is not correct for unpermitted users, so do
// not capture it.
Profile* profile =
Profile::FromBrowserContext(web_contents()->GetBrowserContext());
if (!optimization_guide::IsUserPermittedToFetchFromRemoteOptimizationGuide(
profile->IsOffTheRecord(), profile->GetPrefs())) {
return;
}
is_currently_waiting_ = true;
optimization_guide_keyed_service_->CanApplyOptimization(
navigation_handle->GetURL(),
optimization_guide::proto::GLIC_PAGE_CONTEXT_ELIGIBILITY,
base::BindOnce(&GlicPageContextEligibilityObserver::OnEligibilityResult,
weak_ptr_factory_.GetWeakPtr(),
navigation_handle->GetURL()));
}
void GlicPageContextEligibilityObserver::OnEligibilityResult(
const GURL& url,
optimization_guide::OptimizationGuideDecision decision,
const optimization_guide::OptimizationMetadata& metadata) {
if (url != web_contents()->GetLastCommittedURL()) {
return;
}
is_currently_waiting_ = false;
// Determine eligibility.
is_eligible_ = GetIsEligible(metadata);
NotifyCallbacks(*is_eligible_);
}
void GlicPageContextEligibilityObserver::GetEligibility(
base::OnceCallback<void(bool)> eligibility_callback) {
if (is_eligible_) {
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(std::move(eligibility_callback), *is_eligible_));
return;
}
eligibility_callbacks_.push_back(std::move(eligibility_callback));
if (is_currently_waiting_) {
return;
}
// Otherwise call opt guide on-demand.
is_currently_waiting_ = true;
optimization_guide_keyed_service_->CanApplyOptimizationOnDemand(
{web_contents()->GetLastCommittedURL()},
{optimization_guide::proto::GLIC_PAGE_CONTEXT_ELIGIBILITY},
optimization_guide::proto::CONTEXT_GLIC_PAGE_CONTEXT,
base::BindRepeating(
[&](base::WeakPtr<GlicPageContextEligibilityObserver> observer,
const GURL& url,
const base::flat_map<
optimization_guide::proto::OptimizationType,
optimization_guide::OptimizationGuideDecisionWithMetadata>&
decisions) {
auto it = decisions.find(
optimization_guide::proto::GLIC_PAGE_CONTEXT_ELIGIBILITY);
if (it != decisions.end()) {
observer->OnEligibilityResult(url, it->second.decision,
it->second.metadata);
} else {
// This shouldn't happen if this gets called, so just invoke
// result with false.
observer->OnEligibilityResult(
url, optimization_guide::OptimizationGuideDecision::kFalse,
{});
}
},
weak_ptr_factory_.GetWeakPtr()));
}
void GlicPageContextEligibilityObserver::NotifyCallbacks(bool is_eligible) {
for (auto& eligibility_callback : eligibility_callbacks_) {
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(std::move(eligibility_callback), is_eligible));
}
eligibility_callbacks_.clear();
}
} // namespace glic
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