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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 "cef/libcef/browser/download_manager_delegate_impl.h"
#include <tuple>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "cef/include/cef_download_handler.h"
#include "cef/libcef/browser/browser_host_base.h"
#include "cef/libcef/browser/context.h"
#include "cef/libcef/browser/download_item_impl.h"
#include "cef/libcef/browser/thread_util.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/download_item_utils.h"
#include "content/public/browser/web_contents.h"
#include "net/base/filename_util.h"
#include "third_party/blink/public/mojom/choosers/file_chooser.mojom.h"
using content::DownloadManager;
using content::WebContents;
using download::DownloadItem;
namespace {
// Helper function to retrieve the CefDownloadHandler.
CefRefPtr<CefDownloadHandler> GetDownloadHandler(
CefRefPtr<CefBrowserHostBase> browser) {
CefRefPtr<CefClient> client = browser->GetClient();
if (client.get()) {
return client->GetDownloadHandler();
}
return nullptr;
}
void RunDownloadTargetCallback(download::DownloadTargetCallback callback,
const base::FilePath& path) {
download::DownloadTargetInfo target_info;
target_info.target_path = path;
target_info.intermediate_path = path;
std::move(callback).Run(std::move(target_info));
}
// CefBeforeDownloadCallback implementation.
class CefBeforeDownloadCallbackImpl : public CefBeforeDownloadCallback {
public:
CefBeforeDownloadCallbackImpl(const base::WeakPtr<DownloadManager>& manager,
uint32_t download_id,
const base::FilePath& suggested_name,
download::DownloadTargetCallback callback)
: manager_(manager),
download_id_(download_id),
suggested_name_(suggested_name),
callback_(std::move(callback)) {}
CefBeforeDownloadCallbackImpl(const CefBeforeDownloadCallbackImpl&) = delete;
CefBeforeDownloadCallbackImpl& operator=(
const CefBeforeDownloadCallbackImpl&) = delete;
void Continue(const CefString& download_path, bool show_dialog) override {
if (CEF_CURRENTLY_ON_UIT()) {
if (download_id_ <= 0) {
return;
}
if (manager_) {
base::FilePath path = base::FilePath(download_path);
CEF_POST_USER_VISIBLE_TASK(
base::BindOnce(&CefBeforeDownloadCallbackImpl::GenerateFilename,
manager_, download_id_, suggested_name_, path,
show_dialog, std::move(callback_)));
}
download_id_ = 0;
} else {
CEF_POST_TASK(CEF_UIT,
base::BindOnce(&CefBeforeDownloadCallbackImpl::Continue,
this, download_path, show_dialog));
}
}
bool IsDetached() const { return callback_.is_null(); }
[[nodiscard]] download::DownloadTargetCallback Detach() {
return std::move(callback_);
}
private:
static void GenerateFilename(base::WeakPtr<DownloadManager> manager,
uint32_t download_id,
const base::FilePath& suggested_name,
const base::FilePath& download_path,
bool show_dialog,
download::DownloadTargetCallback callback) {
CEF_REQUIRE_BLOCKING();
base::FilePath suggested_path = download_path;
if (!suggested_path.empty()) {
// Create the directory if necessary.
base::FilePath dir_path = suggested_path.DirName();
if (!base::DirectoryExists(dir_path) &&
!base::CreateDirectory(dir_path)) {
DCHECK(false) << "failed to create the download directory";
suggested_path.clear();
}
}
if (suggested_path.empty()) {
if (base::PathService::Get(base::DIR_TEMP, &suggested_path)) {
// Use the temp directory.
suggested_path = suggested_path.Append(suggested_name);
} else {
// Use the current working directory.
suggested_path = suggested_name;
}
}
CEF_POST_TASK(
CEF_UIT,
base::BindOnce(&CefBeforeDownloadCallbackImpl::ChooseDownloadPath,
manager, download_id, suggested_path, show_dialog,
std::move(callback)));
}
static void ChooseDownloadPath(base::WeakPtr<DownloadManager> manager,
uint32_t download_id,
const base::FilePath& suggested_path,
bool show_dialog,
download::DownloadTargetCallback callback) {
if (!manager) {
return;
}
DownloadItem* item = manager->GetDownload(download_id);
if (!item || item->GetState() != DownloadItem::IN_PROGRESS) {
return;
}
bool handled = false;
if (show_dialog) {
WebContents* web_contents =
content::DownloadItemUtils::GetWebContents(item);
CefRefPtr<CefBrowserHostBase> browser =
CefBrowserHostBase::GetBrowserForContents(web_contents);
if (browser.get()) {
handled = true;
blink::mojom::FileChooserParams params;
params.mode = blink::mojom::FileChooserParams::Mode::kSave;
if (!suggested_path.empty()) {
params.default_file_name = suggested_path;
if (!suggested_path.Extension().empty()) {
params.accept_types.push_back(
CefString(suggested_path.Extension()));
}
}
browser->RunFileChooserForBrowser(
params,
base::BindOnce(
&CefBeforeDownloadCallbackImpl::ChooseDownloadPathCallback,
std::move(callback)));
}
}
if (!handled) {
RunDownloadTargetCallback(std::move(callback), suggested_path);
}
}
static void ChooseDownloadPathCallback(
download::DownloadTargetCallback callback,
const std::vector<base::FilePath>& file_paths) {
DCHECK_LE(file_paths.size(), (size_t)1);
base::FilePath path;
if (file_paths.size() > 0) {
path = file_paths.front();
}
// The download will be cancelled if |path| is empty.
RunDownloadTargetCallback(std::move(callback), path);
}
base::WeakPtr<DownloadManager> manager_;
uint32_t download_id_;
base::FilePath suggested_name_;
download::DownloadTargetCallback callback_;
IMPLEMENT_REFCOUNTING(CefBeforeDownloadCallbackImpl);
};
// CefDownloadItemCallback implementation.
class CefDownloadItemCallbackImpl : public CefDownloadItemCallback {
public:
explicit CefDownloadItemCallbackImpl(
const base::WeakPtr<DownloadManager>& manager,
uint32_t download_id)
: manager_(manager), download_id_(download_id) {}
CefDownloadItemCallbackImpl(const CefDownloadItemCallbackImpl&) = delete;
CefDownloadItemCallbackImpl& operator=(const CefDownloadItemCallbackImpl&) =
delete;
void Cancel() override {
CEF_POST_TASK(CEF_UIT,
base::BindOnce(&CefDownloadItemCallbackImpl::DoCancel, this));
}
void Pause() override {
CEF_POST_TASK(CEF_UIT,
base::BindOnce(&CefDownloadItemCallbackImpl::DoPause, this));
}
void Resume() override {
CEF_POST_TASK(CEF_UIT,
base::BindOnce(&CefDownloadItemCallbackImpl::DoResume, this));
}
private:
void DoCancel() {
if (download_id_ <= 0) {
return;
}
if (manager_) {
DownloadItem* item = manager_->GetDownload(download_id_);
if (item && item->GetState() == DownloadItem::IN_PROGRESS) {
item->Cancel(true);
}
}
download_id_ = 0;
}
void DoPause() {
if (download_id_ <= 0) {
return;
}
if (manager_) {
DownloadItem* item = manager_->GetDownload(download_id_);
if (item && item->GetState() == DownloadItem::IN_PROGRESS) {
item->Pause();
}
}
}
void DoResume() {
if (download_id_ <= 0) {
return;
}
if (manager_) {
DownloadItem* item = manager_->GetDownload(download_id_);
if (item && item->CanResume()) {
item->Resume(true);
}
}
}
base::WeakPtr<DownloadManager> manager_;
uint32_t download_id_;
IMPLEMENT_REFCOUNTING(CefDownloadItemCallbackImpl);
};
} // namespace
CefDownloadManagerDelegateImpl::CefDownloadManagerDelegateImpl(
DownloadManager* manager,
bool alloy_bootstrap)
: manager_(manager),
manager_ptr_factory_(manager),
alloy_bootstrap_(alloy_bootstrap) {
DCHECK(manager);
manager->AddObserver(this);
DownloadManager::DownloadVector items;
manager->GetAllDownloads(&items);
DownloadManager::DownloadVector::const_iterator it = items.begin();
for (; it != items.end(); ++it) {
OnDownloadCreated(manager, *it);
}
}
CefDownloadManagerDelegateImpl::~CefDownloadManagerDelegateImpl() {
ResetManager();
}
void CefDownloadManagerDelegateImpl::OnDownloadUpdated(DownloadItem* download) {
CefRefPtr<CefBrowserHostBase> browser = GetBrowser(download);
CefRefPtr<CefDownloadHandler> handler;
if (browser.get()) {
handler = GetDownloadHandler(browser);
}
if (handler.get()) {
CefRefPtr<CefDownloadItemImpl> download_item(
new CefDownloadItemImpl(download));
CefRefPtr<CefDownloadItemCallback> callback(new CefDownloadItemCallbackImpl(
manager_ptr_factory_.GetWeakPtr(), download->GetId()));
handler->OnDownloadUpdated(browser.get(), download_item.get(), callback);
std::ignore = download_item->Detach(nullptr);
}
}
void CefDownloadManagerDelegateImpl::OnDownloadDestroyed(DownloadItem* item) {
item->RemoveObserver(this);
CefBrowserHostBase* browser = nullptr;
ItemBrowserMap::iterator it = item_browser_map_.find(item);
DCHECK(it != item_browser_map_.end());
if (it != item_browser_map_.end()) {
browser = it->second;
item_browser_map_.erase(it);
}
if (browser) {
// Determine if any remaining DownloadItems are associated with the same
// browser. If not, then unregister as an observer.
bool has_remaining = false;
ItemBrowserMap::const_iterator it2 = item_browser_map_.begin();
for (; it2 != item_browser_map_.end(); ++it2) {
if (it2->second == browser) {
has_remaining = true;
break;
}
}
if (!has_remaining) {
browser->RemoveObserver(this);
}
}
}
void CefDownloadManagerDelegateImpl::OnDownloadCreated(DownloadManager* manager,
DownloadItem* item) {
// This callback may arrive after DetermineDownloadTarget, so we allow
// association from either method.
CefRefPtr<CefBrowserHostBase> browser = GetOrAssociateBrowser(item);
if (!browser) {
// If the download is rejected (e.g. ALT+click on an invalid protocol link)
// then an "interrupted" download will be started via DownloadManagerImpl::
// StartDownloadWithId (originating from CreateInterruptedDownload) with no
// associated WebContents and consequently no associated CEF browser. In
// that case DetermineDownloadTarget will be called before this method.
// TODO(cef): Figure out how to expose this via a client callback.
const std::vector<GURL>& url_chain = item->GetUrlChain();
if (!url_chain.empty()) {
LOG(INFO) << "Rejected download of " << url_chain.back().spec();
}
item->Cancel(true);
}
}
void CefDownloadManagerDelegateImpl::ManagerGoingDown(
DownloadManager* manager) {
DCHECK_EQ(manager, manager_);
ResetManager();
}
bool CefDownloadManagerDelegateImpl::DetermineDownloadTarget(
DownloadItem* item,
download::DownloadTargetCallback* callback) {
if (alloy_bootstrap_) {
const auto& forced_path = item->GetForcedFilePath();
if (!forced_path.empty()) {
RunDownloadTargetCallback(std::move(*callback), forced_path);
return true;
}
}
// This callback may arrive before OnDownloadCreated, so we allow association
// from either method.
CefRefPtr<CefBrowserHostBase> browser = GetOrAssociateBrowser(item);
if (!browser) {
// Cancel by default with Alloy bootstrap.
return alloy_bootstrap_;
}
bool handled = false;
CefRefPtr<CefDownloadHandler> handler = GetDownloadHandler(browser);
if (handler) {
base::FilePath suggested_name = net::GenerateFileName(
item->GetURL(), item->GetContentDisposition(), std::string(),
item->GetSuggestedFilename(), item->GetMimeType(), "download");
CefRefPtr<CefDownloadItemImpl> download_item(new CefDownloadItemImpl(item));
CefRefPtr<CefBeforeDownloadCallbackImpl> callbackObj(
new CefBeforeDownloadCallbackImpl(manager_ptr_factory_.GetWeakPtr(),
item->GetId(), suggested_name,
std::move(*callback)));
handled =
handler->OnBeforeDownload(browser.get(), download_item.get(),
suggested_name.value(), callbackObj.get());
if (!handled && callbackObj->IsDetached()) {
LOG(ERROR) << "Should return true from OnBeforeDownload when executing "
"the callback";
handled = true;
}
if (!handled) {
*callback = callbackObj->Detach();
}
std::ignore = download_item->Detach(nullptr);
}
// Cancel by default with Alloy style.
return handled ? true : alloy_bootstrap_;
}
void CefDownloadManagerDelegateImpl::OnBrowserDestroyed(
CefBrowserHostBase* browser) {
ItemBrowserMap::iterator it = item_browser_map_.begin();
for (; it != item_browser_map_.end(); ++it) {
if (it->second == browser) {
// Don't call back into browsers that have been destroyed. We're not
// canceling the download so it will continue silently until it completes
// or until the associated browser context is destroyed.
it->second = nullptr;
}
}
}
CefRefPtr<CefBrowserHostBase>
CefDownloadManagerDelegateImpl::GetOrAssociateBrowser(
download::DownloadItem* item) {
ItemBrowserMap::const_iterator it = item_browser_map_.find(item);
if (it != item_browser_map_.end()) {
return it->second.get();
}
CefRefPtr<CefBrowserHostBase> browser;
content::WebContents* contents =
content::DownloadItemUtils::GetWebContents(item);
if (contents) {
browser = CefBrowserHostBase::GetBrowserForContents(contents);
LOG_IF(WARNING, !browser) << "No CefBrowser for download item";
}
if (!browser) {
return nullptr;
}
item->AddObserver(this);
item_browser_map_.insert(std::make_pair(item, browser.get()));
// Register as an observer so that we can cancel associated DownloadItems when
// the browser is destroyed.
if (!browser->HasObserver(this)) {
browser->AddObserver(this);
}
return browser;
}
CefRefPtr<CefBrowserHostBase> CefDownloadManagerDelegateImpl::GetBrowser(
DownloadItem* item) {
ItemBrowserMap::const_iterator it = item_browser_map_.find(item);
if (it != item_browser_map_.end()) {
return it->second.get();
}
// If the download is rejected (e.g. ALT+click on an invalid protocol link)
// then an "interrupted" download will be started via DownloadManagerImpl::
// StartDownloadWithId (originating from CreateInterruptedDownload) with no
// associated WebContents and consequently no associated CEF browser. In that
// case DetermineDownloadTarget will be called before OnDownloadCreated.
DCHECK(!content::DownloadItemUtils::GetWebContents(item));
return nullptr;
}
void CefDownloadManagerDelegateImpl::ResetManager() {
if (manager_) {
if (alloy_bootstrap_) {
manager_->SetDelegate(nullptr);
}
manager_->RemoveObserver(this);
manager_ptr_factory_.InvalidateWeakPtrs();
manager_ = nullptr;
}
while (!item_browser_map_.empty()) {
OnDownloadDestroyed(item_browser_map_.begin()->first);
}
}