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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_tab_data.h"
#include <optional>
#include <utility>
#include "base/functional/overloaded.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/utf_string_conversions.h"
#include "components/favicon/content/content_favicon_driver.h"
#include "components/favicon/core/favicon_driver_observer.h"
#include "components/sessions/content/session_tab_helper.h"
#include "content/public/browser/web_contents.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
namespace glic {
namespace {
// Returns whether `a` and `b` both point to the same web contents.
// Note that if both `a` and `b` are invalidated, this returns true, even if the
// web contents they once pointed to is different. For our purposes, this is OK.
bool IsWeakWebContentsEqual(base::WeakPtr<content::WebContents> a,
base::WeakPtr<content::WebContents> b) {
return std::make_pair(a.get(), a.WasInvalidated()) ==
std::make_pair(b.get(), b.WasInvalidated());
}
} // namespace
TabDataObserver::TabDataObserver(
content::WebContents* web_contents,
bool observe_current_page_only,
base::RepeatingCallback<void(glic::mojom::TabDataPtr)> tab_data_changed)
: content::WebContentsObserver(web_contents),
observe_current_page_only_(observe_current_page_only),
tab_data_changed_(std::move(tab_data_changed)) {
if (web_contents) {
auto* favicon_driver =
favicon::ContentFaviconDriver::FromWebContents(web_contents);
if (favicon_driver) {
favicon_driver->AddObserver(this);
}
}
}
TabDataObserver::~TabDataObserver() {
ClearObservation();
}
void TabDataObserver::ClearObservation() {
// If the web contents is destroyed, web_contents() returns null. The favicon
// driver is owned by the web contents, so it's not necessary to remove our
// observer if the web contents is destroyed.
// Note, we do not used a scoped observation because there is no event
// notifying us when a web contents is destroyed.
if (web_contents()) {
auto* favicon_driver =
favicon::ContentFaviconDriver::FromWebContents(web_contents());
if (favicon_driver) {
favicon_driver->RemoveObserver(this);
}
}
Observe(nullptr);
}
void TabDataObserver::PrimaryPageChanged(content::Page& page) {
if (observe_current_page_only_) {
ClearObservation();
} else {
SendUpdate();
}
}
void TabDataObserver::TitleWasSetForMainFrame(
content::RenderFrameHost* render_frame_host) {
SendUpdate();
}
void TabDataObserver::SendUpdate() {
tab_data_changed_.Run(CreateTabData(web_contents()));
}
void TabDataObserver::OnFaviconUpdated(
favicon::FaviconDriver* favicon_driver,
NotificationIconType notification_icon_type,
const GURL& icon_url,
bool icon_url_changed,
const gfx::Image& image) {
SendUpdate();
}
NoFocusedTabData::NoFocusedTabData() = default;
NoFocusedTabData::NoFocusedTabData(std::string_view reason,
content::WebContents* tab)
: active_tab(tab ? tab->GetWeakPtr() : nullptr), no_focus_reason(reason) {}
NoFocusedTabData::~NoFocusedTabData() = default;
NoFocusedTabData::NoFocusedTabData(const NoFocusedTabData& other) = default;
NoFocusedTabData& NoFocusedTabData::operator=(const NoFocusedTabData& other) =
default;
base::expected<content::WebContents*, std::string_view>
FocusedTabData::GetFocus() const {
using ResultType = decltype(GetFocus());
return std::visit(
base::Overloaded{
[](const base::WeakPtr<content::WebContents>& focused_tab)
-> ResultType {
if (focused_tab) {
return focused_tab.get();
}
return base::unexpected(std::string_view("focused tab removed"));
},
[](const NoFocusedTabData& no_focus) -> ResultType {
return base::unexpected(std::string_view(no_focus.no_focus_reason));
},
},
*this);
}
int GetTabId(content::WebContents* web_contents) {
return sessions::SessionTabHelper::IdForTab(web_contents).id();
}
const GURL& GetTabUrl(content::WebContents* web_contents) {
return web_contents->GetLastCommittedURL();
}
// CreateTabData Implementation:
glic::mojom::TabDataPtr CreateTabData(content::WebContents* web_contents) {
if (!web_contents) {
return nullptr;
}
SkBitmap favicon;
auto* favicon_driver =
favicon::ContentFaviconDriver::FromWebContents(web_contents);
if (favicon_driver && favicon_driver->FaviconIsValid()) {
// Attempt to get a 32x32 favicon by default (16x16 DIP at 2x scale).
favicon = favicon_driver->GetFavicon()
.ToImageSkia()
->GetRepresentation(2.0f)
.GetBitmap();
}
return glic::mojom::TabData::New(
GetTabId(web_contents),
sessions::SessionTabHelper::IdForWindowContainingTab(web_contents).id(),
GetTabUrl(web_contents), base::UTF16ToUTF8(web_contents->GetTitle()),
favicon, web_contents->GetContentsMimeType());
}
// CreateFocusedTabData Implementation:
glic::mojom::FocusedTabDataPtr CreateFocusedTabData(
const FocusedTabData& focused_tab_data) {
return std::visit(
base::Overloaded{
[](const base::WeakPtr<content::WebContents>& focused_tab) {
return mojom::FocusedTabData::NewFocusedTab(
CreateTabData(focused_tab.get()));
},
[](const NoFocusedTabData& no_focus) {
return mojom::FocusedTabData::NewNoFocusedTabData(
mojom::NoFocusedTabData::New(
CreateTabData(no_focus.active_tab.get()),
std::string(no_focus.no_focus_reason)));
},
},
focused_tab_data);
}
bool FocusedTabData::IsSame(const FocusedTabData& new_data) const {
if (index() != new_data.index()) {
return false;
}
switch (index()) {
case 0:
return IsWeakWebContentsEqual(std::get<0>(*this), std::get<0>(new_data));
case 1:
return std::get<1>(*this).IsSame(std::get<1>(new_data));
}
NOTREACHED();
}
bool NoFocusedTabData::IsSame(const NoFocusedTabData& other) const {
return IsWeakWebContentsEqual(active_tab, other.active_tab) &&
no_focus_reason == other.no_focus_reason;
}
} // namespace glic
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