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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 COMPONENTS_DOWNLOAD_PUBLIC_COMMON_DOWNLOAD_ITEM_IMPL_DELEGATE_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_COMMON_DOWNLOAD_ITEM_IMPL_DELEGATE_H_
#include <stdint.h>
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/optional.h"
#include "components/download/public/common/download_export.h"
#include "components/download/public/common/download_item.h"
#include "components/download/public/common/download_url_parameters.h"
namespace download {
struct DownloadEntry;
class DownloadItemImpl;
// Delegate for operations that a DownloadItemImpl can't do for itself.
// The base implementation of this class does nothing (returning false
// on predicates) so interfaces not of interest to a derived class may
// be left unimplemented.
class COMPONENTS_DOWNLOAD_EXPORT DownloadItemImplDelegate {
public:
// The boolean argument indicates whether or not the download was
// actually opened.
typedef base::Callback<void(bool)> ShouldOpenDownloadCallback;
DownloadItemImplDelegate();
virtual ~DownloadItemImplDelegate();
// Used for catching use-after-free errors.
void Attach();
void Detach();
using DownloadTargetCallback =
base::Callback<void(const base::FilePath& target_path,
DownloadItem::TargetDisposition disposition,
DownloadDangerType danger_type,
const base::FilePath& intermediate_path,
DownloadInterruptReason interrupt_reason)>;
// Request determination of the download target from the delegate.
virtual void DetermineDownloadTarget(DownloadItemImpl* download,
const DownloadTargetCallback& callback);
// Allows the delegate to delay completion of the download. This function
// will either return true (if the download may complete now) or will return
// false and call the provided callback at some future point. This function
// may be called repeatedly.
virtual bool ShouldCompleteDownload(DownloadItemImpl* download,
const base::Closure& complete_callback);
// Allows the delegate to override the opening of a download. If it returns
// true then it's reponsible for opening the item.
virtual bool ShouldOpenDownload(DownloadItemImpl* download,
const ShouldOpenDownloadCallback& callback);
// Tests if a file type should be opened automatically.
virtual bool ShouldOpenFileBasedOnExtension(const base::FilePath& path);
// Checks whether a downloaded file still exists and updates the
// file's state if the file is already removed.
// The check may or may not result in a later asynchronous call
// to OnDownloadedFileRemoved().
virtual void CheckForFileRemoval(DownloadItemImpl* download_item);
// Return a GUID string used for identifying the application to the system AV
// function for scanning downloaded files. If no GUID is provided or if the
// provided GUID is invalid, then the appropriate quarantining will be
// performed manually without passing the download to the system AV function.
//
// This GUID is only used on Windows.
virtual std::string GetApplicationClientIdForFileScanning() const;
// Called when an interrupted download is resumed.
virtual void ResumeInterruptedDownload(
std::unique_ptr<DownloadUrlParameters> params,
const GURL& site_url);
// Update the persistent store with our information.
virtual void UpdatePersistence(DownloadItemImpl* download);
// Opens the file associated with this download.
virtual void OpenDownload(DownloadItemImpl* download);
// Returns whether this is the most recent download in the rare event where
// multiple downloads are associated with the same file path.
virtual bool IsMostRecentDownloadItemAtFilePath(DownloadItemImpl* download);
// Shows the download via the OS shell.
virtual void ShowDownloadInShell(DownloadItemImpl* download);
// Handle any delegate portions of a state change operation on the
// DownloadItem.
virtual void DownloadRemoved(DownloadItemImpl* download);
// Called when the download is interrupted.
virtual void DownloadInterrupted(DownloadItemImpl* download);
// Get the in progress entry for the download item.
virtual base::Optional<DownloadEntry> GetInProgressEntry(
DownloadItemImpl* download);
// Whether the download is off the record.
virtual bool IsOffTheRecord() const;
// Report extra bytes wasted during resumption.
virtual void ReportBytesWasted(DownloadItemImpl* download);
private:
// For "Outlives attached DownloadItemImpl" invariant assertion.
int count_;
DISALLOW_COPY_AND_ASSIGN(DownloadItemImplDelegate);
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_PUBLIC_COMMON_DOWNLOAD_ITEM_IMPL_DELEGATE_H_
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