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ai_chat_tab_helper.cc
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ai_chat_tab_helper.cc
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/* Copyright (c) 2023 The Brave Authors. All rights reserved.
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at https://mozilla.org/MPL/2.0/. */
#include "brave/components/ai_chat/content/browser/ai_chat_tab_helper.h"
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
#include "base/containers/contains.h"
#include "base/containers/fixed_flat_set.h"
#include "base/functional/bind.h"
#include "base/memory/weak_ptr.h"
#include "base/notreached.h"
#include "base/ranges/algorithm.h"
#include "base/strings/string_util.h"
#include "brave/components/ai_chat/content/browser/page_content_fetcher.h"
#include "brave/components/ai_chat/core/browser/ai_chat_metrics.h"
#include "brave/components/ai_chat/core/common/features.h"
#include "brave/components/ai_chat/core/common/mojom/page_content_extractor.mojom.h"
#include "brave/components/ai_chat/core/common/pref_names.h"
#include "components/favicon/content/content_favicon_driver.h"
#include "components/grit/brave_components_strings.h"
#include "components/prefs/pref_service.h"
#include "components/strings/grit/components_strings.h"
#include "components/user_prefs/user_prefs.h"
#include "content/public/browser/ax_event_notification_details.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/scoped_accessibility_mode.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/browser/web_contents.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "pdf/buildflags.h"
#include "ui/accessibility/ax_mode.h"
#include "ui/base/l10n/l10n_util.h"
namespace ai_chat {
AIChatTabHelper::PDFA11yInfoLoadObserver::PDFA11yInfoLoadObserver(
content::WebContents* web_contents,
AIChatTabHelper* helper)
: content::WebContentsObserver(web_contents), helper_(helper) {}
void AIChatTabHelper::PDFA11yInfoLoadObserver::AccessibilityEventReceived(
const content::AXEventNotificationDetails& details) {
#if BUILDFLAG(ENABLE_PDF)
for (const auto& update : details.updates) {
for (const auto& node : update.nodes) {
if (node.GetStringAttribute(ax::mojom::StringAttribute::kName) ==
l10n_util::GetStringUTF8(IDS_PDF_LOADED_TO_A11Y_TREE)) {
helper_->OnPDFA11yInfoLoaded();
break;
}
}
}
#endif
}
AIChatTabHelper::PDFA11yInfoLoadObserver::~PDFA11yInfoLoadObserver() = default;
// static
void AIChatTabHelper::BindPageContentExtractorHost(
content::RenderFrameHost* rfh,
mojo::PendingAssociatedReceiver<mojom::PageContentExtractorHost> receiver) {
CHECK(rfh);
if (!rfh->IsInPrimaryMainFrame()) {
DVLOG(4) << "Not binding extractor host to non-main frame";
return;
}
auto* sender = content::WebContents::FromRenderFrameHost(rfh);
if (!sender) {
DVLOG(1) << "Cannot bind extractor host, no valid WebContents";
return;
}
auto* tab_helper = AIChatTabHelper::FromWebContents(sender);
if (!tab_helper) {
DVLOG(1) << "Cannot bind extractor host, no AIChatTabHelper - "
<< sender->GetVisibleURL();
return;
}
DVLOG(4) << "Binding extractor host to AIChatTabHelper";
tab_helper->BindPageContentExtractorReceiver(std::move(receiver));
}
AIChatTabHelper::AIChatTabHelper(
content::WebContents* web_contents,
AIChatMetrics* ai_chat_metrics,
base::RepeatingCallback<mojo::PendingRemote<skus::mojom::SkusService>()>
skus_service_getter,
PrefService* local_state_prefs,
const std::string& channel_name)
: content::WebContentsObserver(web_contents),
content::WebContentsUserData<AIChatTabHelper>(*web_contents),
ConversationDriver(
user_prefs::UserPrefs::Get(web_contents->GetBrowserContext()),
local_state_prefs,
ai_chat_metrics,
skus_service_getter,
web_contents->GetBrowserContext()
->GetDefaultStoragePartition()
->GetURLLoaderFactoryForBrowserProcess(),
channel_name),
pdf_load_observer_(
std::make_unique<PDFA11yInfoLoadObserver>(nullptr, this)) {
favicon::ContentFaviconDriver::FromWebContents(web_contents)
->AddObserver(this);
}
AIChatTabHelper::~AIChatTabHelper() = default;
void AIChatTabHelper::SetOnPDFA11yInfoLoadedCallbackForTesting(
base::OnceClosure cb) {
on_pdf_a11y_info_loaded_cb_ = std::move(cb);
}
void AIChatTabHelper::OnPDFA11yInfoLoaded() {
DVLOG(3) << "PDF Loaded";
is_pdf_a11y_info_loaded_ = true;
if (pending_get_page_content_callback_) {
FetchPageContent(web_contents(), "",
std::move(pending_get_page_content_callback_));
}
pdf_load_observer_.reset();
if (on_pdf_a11y_info_loaded_cb_) {
std::move(on_pdf_a11y_info_loaded_cb_).Run();
}
}
// content::WebContentsObserver
void AIChatTabHelper::WebContentsDestroyed() {
favicon::ContentFaviconDriver::FromWebContents(web_contents())
->RemoveObserver(this);
}
void AIChatTabHelper::DidFinishNavigation(
content::NavigationHandle* navigation_handle) {
if (!navigation_handle->IsInMainFrame()) {
return;
}
DVLOG(2) << __func__ << navigation_handle->GetNavigationId()
<< " url: " << navigation_handle->GetURL().spec()
<< " same document? " << navigation_handle->IsSameDocument();
// Allow same-document navigation, as content often changes as a result
// of framgment / pushState / replaceState navigations.
// Content won't be retrieved immediately and we don't have a similar
// "DOM Content Loaded" event, so let's wait for something else such as
// page title changing before committing to starting a new conversation
// and treating it as a "fresh page".
is_same_document_navigation_ = navigation_handle->IsSameDocument();
pending_navigation_id_ = navigation_handle->GetNavigationId();
// Experimentally only call |OnNewPage| for same-page navigations _if_
// it results in a page title change (see |TtileWasSet|).
if (!is_same_document_navigation_) {
OnNewPage(pending_navigation_id_);
}
}
void AIChatTabHelper::TitleWasSet(content::NavigationEntry* entry) {
DVLOG(3) << __func__ << entry->GetTitle();
if (is_same_document_navigation_) {
DVLOG(2) << "Same document navigation detected new \"page\" - calling "
"OnNewPage()";
// Page title modification after same-document navigation seems as good a
// time as any to assume meaningful changes occured to the content.
OnNewPage(pending_navigation_id_);
// Don't respond to further TitleWasSet
is_same_document_navigation_ = false;
}
}
void AIChatTabHelper::InnerWebContentsAttached(
content::WebContents* inner_web_contents,
content::RenderFrameHost* render_frame_host,
bool is_full_page) {
// Setting a11y mode for PDF process which is dedicated for each
// PDF so we don't have to unset it.
if (content::WebContents::FromRenderFrameHost(render_frame_host)
->GetContentsMimeType() == "application/pdf") {
// We need `AXMode::kNativeAPIs` for accessing pdf a11y info and
// `AXMode::kWebContents` for observing a11y events from WebContents.
bool mode_change_needed = false;
auto current_mode = inner_web_contents->GetAccessibilityMode();
if (!current_mode.has_mode(ui::AXMode::kNativeAPIs)) {
current_mode |= ui::AXMode::kNativeAPIs;
mode_change_needed = true;
}
if (!current_mode.has_mode(ui::AXMode::kWebContents)) {
current_mode |= ui::AXMode::kWebContents;
mode_change_needed = true;
}
if (mode_change_needed) {
scoped_accessibility_mode_ =
content::BrowserAccessibilityState::GetInstance()
->CreateScopedModeForWebContents(inner_web_contents,
current_mode);
}
pdf_load_observer_ =
std::make_unique<PDFA11yInfoLoadObserver>(inner_web_contents, this);
is_pdf_a11y_info_loaded_ = false;
}
}
// favicon::FaviconDriverObserver
void AIChatTabHelper::OnFaviconUpdated(
favicon::FaviconDriver* favicon_driver,
NotificationIconType notification_icon_type,
const GURL& icon_url,
bool icon_url_changed,
const gfx::Image& image) {
OnFaviconImageDataChanged();
}
// mojom::PageContentExtractorHost
void AIChatTabHelper::OnInterceptedPageContentChanged() {
// Maybe mark that the page changed, if we didn't detect it already via title
// change after a same-page navigation. This is the main benefit of this
// function.
if (is_same_document_navigation_) {
DVLOG(2) << "Same document navigation detected new \"page\" - calling "
"OnNewPage()";
// Page title modification after same-document navigation seems as good a
// time as any to assume meaningful changes occured to the content.
OnNewPage(pending_navigation_id_);
// Don't respond to further TitleWasSet
is_same_document_navigation_ = false;
}
}
// ai_chat::ConversationDriver
GURL AIChatTabHelper::GetPageURL() const {
return web_contents()->GetLastCommittedURL();
}
void AIChatTabHelper::GetPageContent(GetPageContentCallback callback,
std::string_view invalidation_token) {
if (web_contents()->GetContentsMimeType() == "application/pdf" &&
!is_pdf_a11y_info_loaded_) {
if (pending_get_page_content_callback_) {
std::move(pending_get_page_content_callback_).Run("", false, "");
}
// invalidation_token doesn't matter for PDF extraction.
pending_get_page_content_callback_ = std::move(callback);
} else {
FetchPageContent(web_contents(), invalidation_token, std::move(callback));
}
}
std::u16string AIChatTabHelper::GetPageTitle() const {
return web_contents()->GetTitle();
}
void AIChatTabHelper::BindPageContentExtractorReceiver(
mojo::PendingAssociatedReceiver<mojom::PageContentExtractorHost> receiver) {
page_content_extractor_receiver_.reset();
page_content_extractor_receiver_.Bind(std::move(receiver));
}
WEB_CONTENTS_USER_DATA_KEY_IMPL(AIChatTabHelper);
} // namespace ai_chat