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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/dom_distiller/content/browser/distiller_page_web_contents.h"
#include <memory>
#include <utility>
#include "base/callback.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/utf_string_conversions.h"
#include "components/dom_distiller/content/browser/distiller_javascript_utils.h"
#include "components/dom_distiller/content/browser/web_contents_main_frame_observer.h"
#include "components/dom_distiller/core/distiller_page.h"
#include "components/dom_distiller/core/dom_distiller_constants.h"
#include "components/dom_distiller/core/dom_distiller_service.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
#include "ui/display/display.h"
#include "ui/display/screen.h"
#include "url/gurl.h"
namespace dom_distiller {
SourcePageHandleWebContents::SourcePageHandleWebContents(
content::WebContents* web_contents,
bool owned)
: web_contents_(web_contents), owned_(owned) {
}
SourcePageHandleWebContents::~SourcePageHandleWebContents() {
if (owned_) {
delete web_contents_;
}
}
std::unique_ptr<DistillerPage>
DistillerPageWebContentsFactory::CreateDistillerPage(
const gfx::Size& render_view_size) const {
DCHECK(browser_context_);
return std::unique_ptr<DistillerPage>(new DistillerPageWebContents(
browser_context_, render_view_size,
std::unique_ptr<SourcePageHandleWebContents>()));
}
std::unique_ptr<DistillerPage>
DistillerPageWebContentsFactory::CreateDistillerPageWithHandle(
std::unique_ptr<SourcePageHandle> handle) const {
DCHECK(browser_context_);
std::unique_ptr<SourcePageHandleWebContents> web_contents_handle =
std::unique_ptr<SourcePageHandleWebContents>(
static_cast<SourcePageHandleWebContents*>(handle.release()));
return std::unique_ptr<DistillerPage>(new DistillerPageWebContents(
browser_context_, gfx::Size(), std::move(web_contents_handle)));
}
DistillerPageWebContents::DistillerPageWebContents(
content::BrowserContext* browser_context,
const gfx::Size& render_view_size,
std::unique_ptr<SourcePageHandleWebContents> optional_web_contents_handle)
: state_(IDLE),
source_page_handle_(nullptr),
browser_context_(browser_context),
render_view_size_(render_view_size),
weak_factory_(this) {
if (optional_web_contents_handle) {
source_page_handle_ = std::move(optional_web_contents_handle);
if (render_view_size.IsEmpty())
render_view_size_ =
source_page_handle_->web_contents()->GetContainerBounds().size();
}
}
DistillerPageWebContents::~DistillerPageWebContents() {
}
bool DistillerPageWebContents::StringifyOutput() {
return false;
}
void DistillerPageWebContents::DistillPageImpl(const GURL& url,
const std::string& script) {
DCHECK(browser_context_);
DCHECK(state_ == IDLE);
state_ = LOADING_PAGE;
script_ = script;
if (source_page_handle_ && source_page_handle_->web_contents() &&
source_page_handle_->web_contents()->GetLastCommittedURL() == url) {
WebContentsMainFrameObserver* main_frame_observer =
WebContentsMainFrameObserver::FromWebContents(
source_page_handle_->web_contents());
if (main_frame_observer && main_frame_observer->is_initialized()) {
if (main_frame_observer->is_document_loaded_in_main_frame()) {
// Main frame has already loaded for the current WebContents, so execute
// JavaScript immediately.
ExecuteJavaScript();
} else {
// Main frame document has not loaded yet, so wait until it has before
// executing JavaScript. It will trigger after DocumentLoadedInFrame is
// called for the main frame.
content::WebContentsObserver::Observe(
source_page_handle_->web_contents());
}
} else {
// The WebContentsMainFrameObserver has not been correctly initialized,
// so fall back to creating a new WebContents.
CreateNewWebContents(url);
}
} else {
CreateNewWebContents(url);
}
}
void DistillerPageWebContents::CreateNewWebContents(const GURL& url) {
// Create new WebContents to use for distilling the content.
content::WebContents::CreateParams create_params(browser_context_);
create_params.initially_hidden = true;
content::WebContents* web_contents =
content::WebContents::Create(create_params);
DCHECK(web_contents);
web_contents->SetDelegate(this);
// Start observing WebContents and load the requested URL.
content::WebContentsObserver::Observe(web_contents);
content::NavigationController::LoadURLParams params(url);
web_contents->GetController().LoadURLWithParams(params);
source_page_handle_.reset(
new SourcePageHandleWebContents(web_contents, true));
}
gfx::Size DistillerPageWebContents::GetSizeForNewRenderView(
content::WebContents* web_contents) const {
gfx::Size size(render_view_size_);
if (size.IsEmpty())
size = web_contents->GetContainerBounds().size();
// If size is still empty, set it to fullscreen so that document.offsetWidth
// in the executed domdistiller.js won't be 0.
if (size.IsEmpty()) {
DVLOG(1) << "Using fullscreen as default RenderView size";
size = display::Screen::GetScreen()->GetPrimaryDisplay().size();
}
return size;
}
void DistillerPageWebContents::DocumentLoadedInFrame(
content::RenderFrameHost* render_frame_host) {
if (render_frame_host ==
source_page_handle_->web_contents()->GetMainFrame()) {
ExecuteJavaScript();
}
}
void DistillerPageWebContents::DidFailLoad(
content::RenderFrameHost* render_frame_host,
const GURL& validated_url,
int error_code,
const base::string16& error_description,
bool was_ignored_by_handler) {
if (!render_frame_host->GetParent()) {
content::WebContentsObserver::Observe(NULL);
DCHECK(state_ == LOADING_PAGE || state_ == EXECUTING_JAVASCRIPT);
state_ = PAGELOAD_FAILED;
auto empty = base::MakeUnique<base::Value>();
OnWebContentsDistillationDone(GURL(), base::TimeTicks(), empty.get());
}
}
void DistillerPageWebContents::ExecuteJavaScript() {
content::RenderFrameHost* frame =
source_page_handle_->web_contents()->GetMainFrame();
DCHECK(frame);
DCHECK_EQ(LOADING_PAGE, state_);
state_ = EXECUTING_JAVASCRIPT;
content::WebContentsObserver::Observe(NULL);
// Stop any pending navigation since the intent is to distill the current
// page.
source_page_handle_->web_contents()->Stop();
DVLOG(1) << "Beginning distillation";
RunIsolatedJavaScript(
frame, script_,
base::Bind(&DistillerPageWebContents::OnWebContentsDistillationDone,
weak_factory_.GetWeakPtr(),
source_page_handle_->web_contents()->GetLastCommittedURL(),
base::TimeTicks::Now()));
}
void DistillerPageWebContents::OnWebContentsDistillationDone(
const GURL& page_url,
const base::TimeTicks& javascript_start,
const base::Value* value) {
DCHECK(state_ == IDLE || state_ == LOADING_PAGE || // TODO(nyquist): 493795.
state_ == PAGELOAD_FAILED || state_ == EXECUTING_JAVASCRIPT);
state_ = IDLE;
if (!javascript_start.is_null()) {
base::TimeDelta javascript_time = base::TimeTicks::Now() - javascript_start;
UMA_HISTOGRAM_TIMES("DomDistiller.Time.RunJavaScript", javascript_time);
DVLOG(1) << "DomDistiller.Time.RunJavaScript = " << javascript_time;
}
DistillerPage::OnDistillationDone(page_url, value);
}
} // namespace dom_distiller
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