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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/ui/pdf/infobar/pdf_infobar_controller.h"
#include <optional>
#include "base/feature_list.h"
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/cstring_view.h"
#include "base/task/thread_pool.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/shell_integration.h"
#include "chrome/browser/ui/browser_window/public/browser_window_features.h"
#include "chrome/browser/ui/browser_window/public/browser_window_interface.h"
#include "chrome/browser/ui/pdf/infobar/pdf_infobar_delegate.h"
#include "chrome/browser/ui/pdf/infobar/pdf_infobar_prefs.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/browser/ui/ui_features.h"
#include "chrome/common/buildflags.h"
#include "chrome/common/pref_names.h"
#include "components/infobars/content/content_infobar_manager.h"
#include "components/pdf/common/constants.h"
#include "components/prefs/pref_service.h"
#include "components/tabs/public/tab_interface.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/web_contents.h"
#if BUILDFLAG(IS_WIN)
#include "chrome/install_static/install_util.h"
#endif // BUILDFLAG(IS_WIN)
namespace pdf::infobar {
namespace {
// Returns true if `navigation_handle` is committed, not an error page, and
// contains a PDF.
bool IsLoadedPdf(content::NavigationHandle* navigation_handle) {
const bool has_committed = navigation_handle->HasCommitted();
const bool is_error_page = navigation_handle->IsErrorPage();
auto* web_contents = navigation_handle->GetWebContents();
const bool is_pdf =
web_contents && web_contents->GetContentsMimeType() == pdf::kPDFMimeType;
return has_committed && !is_error_page && is_pdf;
}
// Returns true if `browser` supports being set as default and is a normal,
// non-incognito, non-guest browser.
bool IsAppropriateForInfoBar(BrowserWindowInterface* browser) {
#if BUILDFLAG(IS_WIN)
// On Windows, some install modes don't support being set as default.
if (!install_static::SupportsSetAsDefaultBrowser()) {
return false;
}
#endif // BUILDFLAG(IS_WIN)
if (browser->GetType() != BrowserWindowInterface::TYPE_NORMAL) {
return false;
}
const auto* profile = browser->GetProfile();
if (profile->IsIncognitoProfile() || profile->IsGuestSession()) {
return false;
}
return true;
}
} // namespace
std::optional<bool> PdfInfoBarController::higher_priority_infobar_shown_;
PdfInfoBarController::PdfInfoBarController(BrowserWindowInterface* browser)
: browser_(browser) {
CHECK(base::FeatureList::IsEnabled(features::kPdfInfoBar));
if (!IsAppropriateForInfoBar(browser_)) {
return;
}
browser_subscriptions_.push_back(
browser_->RegisterBrowserDidClose(base::BindRepeating(
&PdfInfoBarController::OnBrowserClosed, base::Unretained(this))));
// This is the entry point to the PDF infobar if it shows when a PDF loads.
if (features::kPdfInfoBarTrigger.Get() ==
features::PdfInfoBarTrigger::kPdfLoad) {
// Register to find out when the active tab changes.
browser_subscriptions_.push_back(browser_->RegisterActiveTabDidChange(
base::BindRepeating(&PdfInfoBarController::OnActiveTabChanged,
base::Unretained(this))));
}
}
PdfInfoBarController::~PdfInfoBarController() = default;
// static
void PdfInfoBarController::MaybeShowInfoBarAtStartup(
base::WeakPtr<BrowserWindowInterface> startup_browser,
bool higher_priority_infobar_shown) {
higher_priority_infobar_shown_ = higher_priority_infobar_shown;
if (!startup_browser) {
return;
}
if (!IsAppropriateForInfoBar(startup_browser.get())) {
return;
}
// This is the entry point to the PDF infobar if it shows at startup.
if (features::kPdfInfoBarTrigger.Get() ==
features::PdfInfoBarTrigger::kStartup) {
startup_browser->GetFeatures().pdf_infobar_controller()->MaybeShowInfoBar();
}
}
void PdfInfoBarController::OnActiveTabChanged(BrowserWindowInterface* browser) {
// Observe web contents to see if it loads a PDF (see
// `DidFinishNavigation()`).
Observe(browser->GetActiveTabInterface()->GetContents());
}
void PdfInfoBarController::OnBrowserClosed(BrowserWindowInterface* browser) {
if (infobar_) {
infobar_manager_->RemoveInfoBar(infobar_);
}
}
void PdfInfoBarController::DidFinishNavigation(
content::NavigationHandle* navigation_handle) {
CHECK(features::kPdfInfoBarTrigger.Get() ==
features::PdfInfoBarTrigger::kPdfLoad);
if (IsLoadedPdf(navigation_handle)) {
MaybeShowInfoBar();
}
}
void PdfInfoBarController::OnInfoBarRemoved(infobars::InfoBar* infobar,
bool animate) {
if (infobar_ != infobar) {
return;
}
infobar_ = nullptr;
infobar_manager_->RemoveObserver(this);
infobar_manager_ = nullptr;
}
void PdfInfoBarController::MaybeShowInfoBar() {
#if BUILDFLAG(IS_MAC)
auto is_default_pdf_viewer_callback = base::BindOnce(
&shell_integration::IsDefaultHandlerForUTType, "com.adobe.pdf");
#elif BUILDFLAG(IS_WIN)
auto is_default_pdf_viewer_callback = base::BindOnce(
&shell_integration::IsDefaultHandlerForFileExtension, ".pdf");
#else
#error PdfInfoBarController should only be created on Windows or MacOS
#endif
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock()}, std::move(is_default_pdf_viewer_callback),
base::BindOnce(&PdfInfoBarController::MaybeShowInfoBarCallback,
weak_factory_.GetWeakPtr()));
}
void PdfInfoBarController::MaybeShowInfoBarCallback(
shell_integration::DefaultWebClientState default_state) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(base::FeatureList::IsEnabled(features::kPdfInfoBar));
// If Chrome is already the default PDF viewer, do nothing.
if (default_state == shell_integration::DefaultWebClientState::IS_DEFAULT ||
default_state ==
shell_integration::DefaultWebClientState::OTHER_MODE_IS_DEFAULT) {
return;
}
// Don't offer to be the default PDF viewer if Chrome is set not to view PDFs.
if (IsPdfViewerDisabled(browser_->GetProfile())) {
return;
}
// Don't offer to be the default PDF viewer if default apps are controlled by
// a policy.
if (IsDefaultBrowserPolicyControlled()) {
return;
}
// Don't show the infobar if it's already showing or was recently shown.
if (infobar_) {
return;
}
if (InfoBarShownRecentlyOrMaxTimes()) {
return;
}
// Don't show the infobar if a higher priority infobar has been shown or might
// be about to show, to avoid asking too many similar questions in a session.
if (!higher_priority_infobar_shown_.has_value() ||
higher_priority_infobar_shown_.value()) {
return;
}
content::WebContents* web_contents =
browser_->GetTabStripModel()->GetActiveWebContents();
if (!web_contents) {
return;
}
// Show the PDF infobar.
infobar_manager_ =
infobars::ContentInfoBarManager::FromWebContents(web_contents);
infobar_manager_->AddObserver(this);
infobar_ = PdfInfoBarDelegate::Create(infobar_manager_);
SetInfoBarShownRecently();
}
// static
void PdfInfoBarController::SetHigherPriorityInfoBarShownForTesting(
bool higher_priority_infobar_shown) {
higher_priority_infobar_shown_ = higher_priority_infobar_shown;
}
} // namespace pdf::infobar
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