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// Copyright (c) 2012 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.
#ifndef CHROME_BROWSER_SEARCH_THUMBNAIL_SOURCE_H_
#define CHROME_BROWSER_SEARCH_THUMBNAIL_SOURCE_H_
#include <string>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "content/public/browser/url_data_source.h"
#include "url/gurl.h"
class Profile;
class SkBitmap;
namespace base {
class RefCountedMemory;
}
namespace thumbnails {
class ThumbnailService;
}
namespace suggestions {
class ImageFetcher;
}
// ThumbnailSource is the gateway between network-level chrome: requests for
// thumbnails and the history/top-sites backend that serves these.
class ThumbnailSource : public content::URLDataSource {
public:
ThumbnailSource(Profile* profile, bool capture_thumbnails);
~ThumbnailSource() override;
// content::URLDataSource implementation.
std::string GetSource() const override;
void StartDataRequest(
const std::string& path,
int render_process_id,
int render_frame_id,
const content::URLDataSource::GotDataCallback& callback) override;
std::string GetMimeType(const std::string& path) const override;
base::MessageLoop* MessageLoopForRequestPath(
const std::string& path) const override;
bool ShouldServiceRequest(const net::URLRequest* request) const override;
// Extracts the |page_url| (e.g. cnn.com) and the |fallback_thumbnail_url|
// fetchable from the server, if present, from the |path|. Visible for
// testing.
void ExtractPageAndThumbnailUrls(const std::string& path,
GURL* page_url,
GURL* fallback_thumbnail_url);
private:
// Returns a JPEG-encoded |bitmap| to the |callback| if valid, or the default
// thumbnail.
void SendFetchedUrlImage(
const content::URLDataSource::GotDataCallback& callback,
const GURL& url,
const SkBitmap* bitmap);
// Raw PNG representation of the thumbnail to show when the thumbnail
// database doesn't have a thumbnail for a webpage.
scoped_refptr<base::RefCountedMemory> default_thumbnail_;
// ThumbnailService.
scoped_refptr<thumbnails::ThumbnailService> thumbnail_service_;
// ImageFetcher.
scoped_ptr<suggestions::ImageFetcher> image_fetcher_;
// Indicate that, when a URL for which we don't have a thumbnail is requested
// from this source, then Chrome should capture a thumbnail next time it
// navigates to this URL. This is useful when the thumbnail URLs are generated
// by an external service rather than TopSites, so Chrome can learn about the
// URLs for which it should get thumbnails. Sources that capture thumbnails
// are also be more lenient when matching thumbnail URLs by checking for
// existing thumbnails in the database that contain a URL matching the prefix
// of the requested URL.
const bool capture_thumbnails_;
base::WeakPtrFactory<ThumbnailSource> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ThumbnailSource);
};
#endif // CHROME_BROWSER_SEARCH_THUMBNAIL_SOURCE_H_
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