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// Copyright 2014 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/dom_distiller/tab_utils.h"
#include <utility>
#include "base/location.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/single_thread_task_runner.h"
#include "build/build_config.h"
#include "chrome/browser/android/tab_android.h"
#include "chrome/browser/dom_distiller/dom_distiller_service_factory.h"
#include "chrome/browser/ui/tab_contents/core_tab_helper.h"
#include "components/back_forward_cache/back_forward_cache_disable.h"
#include "components/dom_distiller/content/browser/distiller_page_web_contents.h"
#include "components/dom_distiller/core/distiller_page.h"
#include "components/dom_distiller/core/dom_distiller_service.h"
#include "components/dom_distiller/core/task_tracker.h"
#include "components/dom_distiller/core/url_constants.h"
#include "components/dom_distiller/core/url_utils.h"
#include "content/public/browser/back_forward_cache.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
namespace {
using dom_distiller::ArticleDistillationUpdate;
using dom_distiller::DistilledArticleProto;
using dom_distiller::DistillerPage;
using dom_distiller::DomDistillerService;
using dom_distiller::DomDistillerServiceFactory;
using dom_distiller::SourcePageHandle;
using dom_distiller::SourcePageHandleWebContents;
using dom_distiller::ViewerHandle;
using dom_distiller::ViewRequestDelegate;
// An no-op ViewRequestDelegate which holds a ViewerHandle and deletes itself
// after the WebContents navigates or goes away. This class is a band-aid to
// keep a TaskTracker around until the distillation starts from the viewer.
class SelfDeletingRequestDelegate : public ViewRequestDelegate,
public content::WebContentsObserver {
public:
explicit SelfDeletingRequestDelegate(content::WebContents* web_contents);
~SelfDeletingRequestDelegate() override;
// ViewRequestDelegate implementation.
void OnArticleReady(const DistilledArticleProto* article_proto) override;
void OnArticleUpdated(ArticleDistillationUpdate article_update) override;
// content::WebContentsObserver implementation.
void PrimaryPageChanged(content::Page& page) override;
void PrimaryMainFrameRenderProcessGone(
base::TerminationStatus status) override;
void WebContentsDestroyed() override;
// Takes ownership of the ViewerHandle to keep distillation alive until |this|
// is deleted.
void TakeViewerHandle(std::unique_ptr<ViewerHandle> viewer_handle);
private:
// The handle to the view request towards the DomDistillerService. It
// needs to be kept around to ensure the distillation request finishes.
std::unique_ptr<ViewerHandle> viewer_handle_;
};
void SelfDeletingRequestDelegate::PrimaryPageChanged(content::Page& page) {
Observe(nullptr);
base::SingleThreadTaskRunner::GetCurrentDefault()->DeleteSoon(FROM_HERE,
this);
}
void SelfDeletingRequestDelegate::PrimaryMainFrameRenderProcessGone(
base::TerminationStatus status) {
Observe(nullptr);
base::SingleThreadTaskRunner::GetCurrentDefault()->DeleteSoon(FROM_HERE,
this);
}
void SelfDeletingRequestDelegate::WebContentsDestroyed() {
Observe(nullptr);
base::SingleThreadTaskRunner::GetCurrentDefault()->DeleteSoon(FROM_HERE,
this);
}
SelfDeletingRequestDelegate::SelfDeletingRequestDelegate(
content::WebContents* web_contents)
: WebContentsObserver(web_contents) {}
SelfDeletingRequestDelegate::~SelfDeletingRequestDelegate() = default;
void SelfDeletingRequestDelegate::OnArticleReady(
const DistilledArticleProto* article_proto) {}
void SelfDeletingRequestDelegate::OnArticleUpdated(
ArticleDistillationUpdate article_update) {}
void SelfDeletingRequestDelegate::TakeViewerHandle(
std::unique_ptr<ViewerHandle> viewer_handle) {
viewer_handle_ = std::move(viewer_handle);
}
// Start loading the viewer URL of the current page in |web_contents|.
void StartNavigationToDistillerViewer(content::WebContents* web_contents,
const GURL& url) {
GURL viewer_url = dom_distiller::url_utils::GetDistillerViewUrlFromUrl(
dom_distiller::kDomDistillerScheme, url,
base::UTF16ToUTF8(web_contents->GetTitle()),
(base::TimeTicks::Now() - base::TimeTicks()).InMilliseconds());
content::NavigationController::LoadURLParams params(viewer_url);
params.transition_type = ui::PAGE_TRANSITION_AUTO_BOOKMARK;
web_contents->GetController().LoadURLWithParams(params);
}
void MaybeStartDistillation(
std::unique_ptr<SourcePageHandleWebContents> source_page_handle,
SelfDeletingRequestDelegate* view_request_delegate) {
const GURL& last_committed_url =
source_page_handle->web_contents()->GetLastCommittedURL();
if (!dom_distiller::url_utils::IsUrlDistillable(last_committed_url))
return;
// Disable back-forward cache when the distillation is in progress as it would
// be cancelled and would not be restarted when the page is restored from the
// cache.
content::BackForwardCache::DisableForRenderFrameHost(
source_page_handle->web_contents()->GetPrimaryMainFrame(),
back_forward_cache::DisabledReason(
back_forward_cache::DisabledReasonId::
kDomDistiller_SelfDeletingRequestDelegate));
// Start distillation using |source_page_handle|, and ensure ViewerHandle
// stays around until the viewer requests distillation.
DomDistillerService* dom_distiller_service =
DomDistillerServiceFactory::GetForBrowserContext(
source_page_handle->web_contents()->GetBrowserContext());
std::unique_ptr<DistillerPage> distiller_page =
dom_distiller_service->CreateDefaultDistillerPageWithHandle(
std::move(source_page_handle));
std::unique_ptr<ViewerHandle> viewer_handle = dom_distiller_service->ViewUrl(
view_request_delegate, std::move(distiller_page), last_committed_url);
view_request_delegate->TakeViewerHandle(std::move(viewer_handle));
}
} // namespace
void DistillCurrentPageAndView(content::WebContents* old_web_contents) {
DCHECK(old_web_contents);
// Create new WebContents.
content::WebContents::CreateParams create_params(
old_web_contents->GetBrowserContext());
std::unique_ptr<content::WebContents> new_web_contents =
content::WebContents::Create(create_params);
DCHECK(new_web_contents);
// Copy all navigation state from the old WebContents to the new one.
new_web_contents->GetController().CopyStateFrom(
&old_web_contents->GetController(), /* needs_reload */ true);
// StartNavigationToDistillerViewer must come before swapping the tab contents
// to avoid triggering a reload of the page. This reloadmakes it very
// difficult to distinguish between the intermediate reload and a user hitting
// the back button.
StartNavigationToDistillerViewer(new_web_contents.get(),
old_web_contents->GetLastCommittedURL());
// This is used to start distillation and keep task_tracker alive till
// main viewer is created.
// Observes |new_web_contents| and is self deleted in the following cases
// (whichever happens first).
// 1. After navigation to distiller viewer is completed
// 2. When |new_web_contents| is destroyed
// 3. When render process attached to |new_web_contents| is gone
// Observing new_web_contents instead of |old_web_contents| will make sure
// that the destruction of |old_web_contents| will happen along with other
// web_contents else we might end up caching it till browser close which will
// lead to improper shutdown.
// For more details refer - https://crbug.com/1221168
SelfDeletingRequestDelegate* view_request_delegate =
new SelfDeletingRequestDelegate(new_web_contents.get());
TabAndroid* tab = TabAndroid::FromWebContents(old_web_contents);
std::unique_ptr<content::WebContents> old_web_contents_owned =
tab->SwapWebContents(std::move(new_web_contents),
/*did_start_load=*/false,
/*did_finish_load=*/false);
std::unique_ptr<SourcePageHandleWebContents> source_page_handle(
new SourcePageHandleWebContents(old_web_contents_owned.release(), true));
MaybeStartDistillation(std::move(source_page_handle), view_request_delegate);
}
void DistillCurrentPage(content::WebContents* source_web_contents) {
DCHECK(source_web_contents);
std::unique_ptr<SourcePageHandleWebContents> source_page_handle(
new SourcePageHandleWebContents(source_web_contents, false));
SelfDeletingRequestDelegate* view_request_delegate =
new SelfDeletingRequestDelegate(source_web_contents);
MaybeStartDistillation(std::move(source_page_handle), view_request_delegate);
}
void DistillAndView(content::WebContents* source_web_contents,
content::WebContents* destination_web_contents) {
DCHECK(destination_web_contents);
DistillCurrentPage(source_web_contents);
StartNavigationToDistillerViewer(destination_web_contents,
source_web_contents->GetLastCommittedURL());
}
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