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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.
#include "content/browser/download/drag_download_file.h"
#include <utility>
#include "base/bind.h"
#include "base/files/file.h"
#include "base/location.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "build/build_config.h"
#include "components/download/public/common/download_item.h"
#include "components/download/public/common/download_stats.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/download_request_utils.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
namespace content {
namespace {
typedef base::Callback<void(bool)> OnCompleted;
} // namespace
// On windows, DragDownloadFile runs on a thread other than the UI thread.
// download::DownloadItem and DownloadManager may not be accessed on any thread
// other than the UI thread. DragDownloadFile may run on either the "drag"
// thread or the UI thread depending on the platform, but DragDownloadFileUI
// strictly always runs on the UI thread. On platforms where DragDownloadFile
// runs on the UI thread, none of the PostTasks are necessary, but it simplifies
// the code to do them anyway.
class DragDownloadFile::DragDownloadFileUI
: public download::DownloadItem::Observer {
public:
DragDownloadFileUI(
const GURL& url,
const Referrer& referrer,
const std::string& referrer_encoding,
WebContents* web_contents,
scoped_refptr<base::SingleThreadTaskRunner> on_completed_task_runner,
const OnCompleted& on_completed)
: on_completed_task_runner_(on_completed_task_runner),
on_completed_(on_completed),
url_(url),
referrer_(referrer),
referrer_encoding_(referrer_encoding),
web_contents_(web_contents),
download_item_(nullptr),
weak_ptr_factory_(this) {
DCHECK(on_completed_task_runner_);
DCHECK(!on_completed_.is_null());
DCHECK(web_contents_);
// May be called on any thread.
// Do not call weak_ptr_factory_.GetWeakPtr() outside the UI thread.
}
void InitiateDownload(base::File file,
const base::FilePath& file_path) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// TODO(https://crbug.com/614134) This should use the frame actually
// containing the link being dragged rather than the main frame of the tab.
net::NetworkTrafficAnnotationTag traffic_annotation =
net::DefineNetworkTrafficAnnotation("drag_download_file", R"(
semantics {
sender: "Drag To Download"
description:
"Users can download files by dragging them out of browser and into "
"a disk related area."
trigger: "When user drags a file from the browser."
data: "None."
destination: WEBSITE
}
policy {
cookies_allowed: YES
cookies_store: "user"
setting:
"This feature cannot be disabled in settings, but it is only "
"activated by direct user action."
chrome_policy {
DownloadRestrictions {
DownloadRestrictions: 3
}
}
})");
std::unique_ptr<download::DownloadUrlParameters> params(
DownloadRequestUtils::CreateDownloadForWebContentsMainFrame(
web_contents_, url_, traffic_annotation));
params->set_referrer(referrer_.url);
params->set_referrer_policy(
Referrer::ReferrerPolicyForUrlRequest(referrer_.policy));
params->set_referrer_encoding(referrer_encoding_);
params->set_callback(base::Bind(&DragDownloadFileUI::OnDownloadStarted,
weak_ptr_factory_.GetWeakPtr()));
params->set_file_path(file_path);
params->set_file(std::move(file)); // Nulls file.
params->set_download_source(download::DownloadSource::DRAG_AND_DROP);
BrowserContext::GetDownloadManager(web_contents_->GetBrowserContext())
->DownloadUrl(std::move(params));
}
void Cancel() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (download_item_)
download_item_->Cancel(true);
}
void Delete() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
delete this;
}
private:
~DragDownloadFileUI() override {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (download_item_)
download_item_->RemoveObserver(this);
}
void OnDownloadStarted(download::DownloadItem* item,
download::DownloadInterruptReason interrupt_reason) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!item || item->GetState() != download::DownloadItem::IN_PROGRESS) {
DCHECK(!item ||
item->GetLastReason() != download::DOWNLOAD_INTERRUPT_REASON_NONE);
on_completed_task_runner_->PostTask(FROM_HERE,
base::BindOnce(on_completed_, false));
return;
}
DCHECK_EQ(download::DOWNLOAD_INTERRUPT_REASON_NONE, interrupt_reason);
download_item_ = item;
download_item_->AddObserver(this);
}
// download::DownloadItem::Observer:
void OnDownloadUpdated(download::DownloadItem* item) override {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK_EQ(download_item_, item);
download::DownloadItem::DownloadState state = download_item_->GetState();
if (state == download::DownloadItem::COMPLETE ||
state == download::DownloadItem::CANCELLED ||
state == download::DownloadItem::INTERRUPTED) {
if (!on_completed_.is_null()) {
on_completed_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(on_completed_,
state == download::DownloadItem::COMPLETE));
on_completed_.Reset();
}
download_item_->RemoveObserver(this);
download_item_ = nullptr;
}
// Ignore other states.
}
void OnDownloadDestroyed(download::DownloadItem* item) override {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK_EQ(download_item_, item);
if (!on_completed_.is_null()) {
const bool is_complete =
download_item_->GetState() == download::DownloadItem::COMPLETE;
on_completed_task_runner_->PostTask(
FROM_HERE, base::BindOnce(on_completed_, is_complete));
on_completed_.Reset();
}
download_item_->RemoveObserver(this);
download_item_ = nullptr;
}
scoped_refptr<base::SingleThreadTaskRunner> const on_completed_task_runner_;
OnCompleted on_completed_;
GURL url_;
Referrer referrer_;
std::string referrer_encoding_;
WebContents* web_contents_;
download::DownloadItem* download_item_;
// Only used in the callback from DownloadManager::DownloadUrl().
base::WeakPtrFactory<DragDownloadFileUI> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(DragDownloadFileUI);
};
DragDownloadFile::DragDownloadFile(const base::FilePath& file_path,
base::File file,
const GURL& url,
const Referrer& referrer,
const std::string& referrer_encoding,
WebContents* web_contents)
: file_path_(file_path),
file_(std::move(file)),
drag_task_runner_(base::ThreadTaskRunnerHandle::Get()),
state_(INITIALIZED),
drag_ui_(nullptr),
weak_ptr_factory_(this) {
drag_ui_ = new DragDownloadFileUI(
url, referrer, referrer_encoding, web_contents, drag_task_runner_,
base::Bind(&DragDownloadFile::DownloadCompleted,
weak_ptr_factory_.GetWeakPtr()));
DCHECK(!file_path_.empty());
}
DragDownloadFile::~DragDownloadFile() {
CheckThread();
// This is the only place that drag_ui_ can be deleted from. Post a message to
// the UI thread so that it calls RemoveObserver on the right thread, and so
// that this task will run after the InitiateDownload task runs on the UI
// thread.
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::BindOnce(&DragDownloadFileUI::Delete, base::Unretained(drag_ui_)));
drag_ui_ = nullptr;
}
void DragDownloadFile::Start(ui::DownloadFileObserver* observer) {
CheckThread();
if (state_ != INITIALIZED)
return;
state_ = STARTED;
DCHECK(!observer_.get());
observer_ = observer;
DCHECK(observer_.get());
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::BindOnce(&DragDownloadFileUI::InitiateDownload,
base::Unretained(drag_ui_), std::move(file_), file_path_));
}
bool DragDownloadFile::Wait() {
CheckThread();
if (state_ == STARTED)
nested_loop_.Run();
return state_ == SUCCESS;
}
void DragDownloadFile::Stop() {
CheckThread();
if (drag_ui_) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::BindOnce(&DragDownloadFileUI::Cancel,
base::Unretained(drag_ui_)));
}
}
void DragDownloadFile::DownloadCompleted(bool is_successful) {
CheckThread();
state_ = is_successful ? SUCCESS : FAILURE;
if (is_successful)
observer_->OnDownloadCompleted(file_path_);
else
observer_->OnDownloadAborted();
// Release the observer since we do not need it any more.
observer_ = nullptr;
if (nested_loop_.running())
nested_loop_.Quit();
}
void DragDownloadFile::CheckThread() {
#if defined(OS_WIN)
DCHECK(drag_task_runner_->BelongsToCurrentThread());
#else
DCHECK_CURRENTLY_ON(BrowserThread::UI);
#endif
}
} // namespace content
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