1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/ui/webui/ntp/thumbnail_source.h"
6
7#include "base/callback.h"
8#include "base/memory/ref_counted_memory.h"
9#include "base/message_loop/message_loop.h"
10#include "chrome/browser/profiles/profile.h"
11#include "chrome/browser/search/instant_io_context.h"
12#include "chrome/browser/thumbnails/thumbnail_service.h"
13#include "chrome/browser/thumbnails/thumbnail_service_factory.h"
14#include "chrome/common/url_constants.h"
15#include "net/url_request/url_request.h"
16#include "url/gurl.h"
17
18using content::BrowserThread;
19
20// Set ThumbnailService now as Profile isn't thread safe.
21ThumbnailSource::ThumbnailSource(Profile* profile, bool capture_thumbnails)
22    : thumbnail_service_(ThumbnailServiceFactory::GetForProfile(profile)),
23      profile_(profile),
24      capture_thumbnails_(capture_thumbnails) {
25}
26
27ThumbnailSource::~ThumbnailSource() {
28}
29
30std::string ThumbnailSource::GetSource() const {
31  return capture_thumbnails_ ?
32      chrome::kChromeUIThumbnailHost2 : chrome::kChromeUIThumbnailHost;
33}
34
35void ThumbnailSource::StartDataRequest(
36    const std::string& path,
37    int render_process_id,
38    int render_frame_id,
39    const content::URLDataSource::GotDataCallback& callback) {
40  scoped_refptr<base::RefCountedMemory> data;
41  if (thumbnail_service_->GetPageThumbnail(GURL(path), capture_thumbnails_,
42                                           &data)) {
43    // We have the thumbnail.
44    callback.Run(data.get());
45  } else {
46    callback.Run(default_thumbnail_.get());
47  }
48  if (capture_thumbnails_)
49    thumbnail_service_->AddForcedURL(GURL(path));
50}
51
52std::string ThumbnailSource::GetMimeType(const std::string&) const {
53  // We need to explicitly return a mime type, otherwise if the user tries to
54  // drag the image they get no extension.
55  return "image/png";
56}
57
58base::MessageLoop* ThumbnailSource::MessageLoopForRequestPath(
59    const std::string& path) const {
60  // TopSites can be accessed from the IO thread.
61  return thumbnail_service_.get() ?
62      NULL : content::URLDataSource::MessageLoopForRequestPath(path);
63}
64
65bool ThumbnailSource::ShouldServiceRequest(
66    const net::URLRequest* request) const {
67  if (request->url().SchemeIs(chrome::kChromeSearchScheme))
68    return InstantIOContext::ShouldServiceRequest(request);
69  return URLDataSource::ShouldServiceRequest(request);
70}
71