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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_SHORTCUTS_DOCUMENT_ICON_FETCHER_TASK_H_
#define CHROME_BROWSER_SHORTCUTS_DOCUMENT_ICON_FETCHER_TASK_H_
#include <memory>
#include <vector>
#include "base/containers/flat_map.h"
#include "base/functional/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "base/types/expected.h"
#include "components/webapps/common/web_page_metadata.mojom-forward.h"
#include "components/webapps/common/web_page_metadata_agent.mojom-forward.h"
#include "content/public/browser/document_user_data.h"
#include "mojo/public/cpp/bindings/associated_remote.h"
namespace content {
class WebContents;
} // namespace content
class GURL;
class SkBitmap;
namespace gfx {
class Size;
}
namespace shortcuts {
enum class FetchIconsForDocumentError { kTaskDestroyed, kMetadataFetchFailed };
using FetchIconsFromDocumentResult =
base::expected<std::vector<SkBitmap>, FetchIconsForDocumentError>;
using FetchIconsFromDocumentCallback =
base::OnceCallback<void(FetchIconsFromDocumentResult)>;
// This object is responsible for fetching all available icons from a given
// document.
class DocumentIconFetcherTask {
public:
// Creates a task that fetches all icons for the top level primary frame of
// the given web contents. `callback` will always be called (even on document
// destruction), and always called asynchronously. If the callback is not
// called with an error, it is guaranteed to include at least one icon (i.e.
// it is not possible for fetching to succeed but not return any icons. If no
// icons were found, a fallback icon is generated).
DocumentIconFetcherTask(content::WebContents& web_contents,
FetchIconsFromDocumentCallback callback);
~DocumentIconFetcherTask();
void StartIconFetching();
private:
void OnMetadataFetchError();
void OnWebPageMetadataObtained(
mojo::AssociatedRemote<webapps::mojom::WebPageMetadataAgent>
metadata_agent,
webapps::mojom::WebPageMetadataPtr web_page_metadata);
void DidDownloadFavicon(int id,
int http_status_code,
const GURL& image_url,
const std::vector<SkBitmap>& bitmaps,
const std::vector<gfx::Size>& sizes);
void MaybeCompleteImageDownloadAndSelfDestruct();
void OnIconFetchingCompleteSelfDestruct(FetchIconsFromDocumentResult result);
base::WeakPtr<content::WebContents> web_contents_;
std::u16string fallback_letter_;
FetchIconsFromDocumentCallback final_callback_;
bool metadata_fetch_complete_ = false;
int num_pending_image_requests_ = 0;
std::vector<SkBitmap> icons_;
base::WeakPtrFactory<DocumentIconFetcherTask> weak_factory_{this};
};
} // namespace shortcuts
#endif // CHROME_BROWSER_SHORTCUTS_DOCUMENT_ICON_FETCHER_TASK_H_
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