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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_PAGE_H_
#define COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_PAGE_H_
#include <memory>
#include <string>
#include "base/functional/callback.h"
#include "base/values.h"
#include "third_party/dom_distiller_js/dom_distiller.pb.h"
#include "ui/gfx/geometry/size.h"
#include "url/gurl.h"
namespace dom_distiller {
class SourcePageHandle {
public:
virtual ~SourcePageHandle() = default;
};
// Injects JavaScript into a page, and uses it to extract and return long-form
// content. The class can be reused to load and distill multiple pages,
// following the state transitions described along with the class's states.
// Constructing a DistillerPage should be cheap, as some of the instances can be
// thrown away without ever being used.
class DistillerPage {
public:
using DistillerPageCallback = base::OnceCallback<void(
std::unique_ptr<proto::DomDistillerResult> distilled_page,
bool distillation_successful)>;
DistillerPage();
virtual ~DistillerPage();
// Loads a URL. |OnDistillationDone| is called when the load completes or
// fails. May be called when the distiller is idle. Callers can assume that,
// for a given |url| and |options|, any DistillerPage implementation will
// extract the same content.
void DistillPage(const GURL& url,
const proto::DomDistillerOptions options,
DistillerPageCallback callback);
// Called when the JavaScript execution completes. |page_url| is the url of
// the distilled page. |value| contains data returned by the script.
virtual void OnDistillationDone(const GURL& page_url,
const base::Value* value);
// Returns true if the distiller page should fetch distillation data for
// offline consumption.
virtual bool ShouldFetchOfflineData() = 0;
DistillerPage(const DistillerPage&) = delete;
DistillerPage& operator=(const DistillerPage&) = delete;
protected:
// Called by |DistillPage| to carry out platform-specific instructions to load
// and distill the |url| using the provided |script|. The extracted content
// should be the same regardless of the DistillerPage implementation.
virtual void DistillPageImpl(const GURL& url, const std::string& script) = 0;
private:
bool ready_;
DistillerPageCallback distiller_page_callback_;
};
// Factory for generating a |DistillerPage|.
class DistillerPageFactory {
public:
virtual ~DistillerPageFactory();
// Constructs and returns a new DistillerPage. The implementation of this
// should be very cheap, since the pages can be thrown away without being
// used.
virtual std::unique_ptr<DistillerPage> CreateDistillerPage(
const gfx::Size& render_view_size) const = 0;
virtual std::unique_ptr<DistillerPage> CreateDistillerPageWithHandle(
std::unique_ptr<SourcePageHandle> handle) const = 0;
};
} // namespace dom_distiller
#endif // COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_PAGE_H_
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