// Copyright (c) 2006-2009 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 "chrome/browser/download/download_manager.h"
#include "app/l10n_util.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/path_service.h"
#include "base/rand_util.h"
#include "base/stl_util-inl.h"
#include "base/string_util.h"
#include "base/sys_string_conversions.h"
#include "base/task.h"
#include "base/thread.h"
#include "base/timer.h"
#include "chrome/browser/browser_list.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/download/download_file.h"
#include "chrome/browser/extensions/extensions_service.h"
#include "chrome/browser/profile.h"
#include "chrome/browser/renderer_host/render_process_host.h"
#include "chrome/browser/renderer_host/render_view_host.h"
#include "chrome/browser/renderer_host/resource_dispatcher_host.h"
#include "chrome/browser/tab_contents/tab_util.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/platform_util.h"
#include "chrome/common/pref_names.h"
#include "chrome/common/pref_service.h"
#include "googleurl/src/gurl.h"
#include "grit/chromium_strings.h"
#include "grit/generated_resources.h"
#include "net/base/mime_util.h"
#include "net/base/net_util.h"
#include "net/url_request/url_request_context.h"
#if defined(OS_WIN)
#include "app/win_util.h"
#include "base/registry.h"
#include "base/win_util.h"
#endif
#if !defined(OS_MACOSX)
// Used for initializing the list of dangerous extensions. We don't support it
// yet on mac.
#include "chrome/browser/download/download_util.h"
#endif
#if defined(OS_LINUX)
#include <gtk/gtk.h>
#endif
// Periodically update our observers.
class DownloadItemUpdateTask : public Task {
public:
explicit DownloadItemUpdateTask(DownloadItem* item) : item_(item) {}
void Run() { if (item_) item_->UpdateObservers(); }
private:
DownloadItem* item_;
};
// Update frequency (milliseconds).
static const int kUpdateTimeMs = 1000;
// Our download table ID starts at 1, so we use 0 to represent a download that
// has started, but has not yet had its data persisted in the table. We use fake
// database handles in incognito mode starting at -1 and progressively getting
// more negative.
static const int kUninitializedHandle = 0;
// Appends the passed the number between parenthesis the path before the
// extension.
static void AppendNumberToPath(FilePath* path, int number) {
file_util::InsertBeforeExtension(path,
StringPrintf(FILE_PATH_LITERAL(" (%d)"), number));
}
// Attempts to find a number that can be appended to that path to make it
// unique. If |path| does not exist, 0 is returned. If it fails to find such
// a number, -1 is returned.
static int GetUniquePathNumber(const FilePath& path) {
const int kMaxAttempts = 100;
if (!file_util::PathExists(path))
return 0;
FilePath new_path;
for (int count = 1; count <= kMaxAttempts; ++count) {
new_path = FilePath(path);
AppendNumberToPath(&new_path, count);
if (!file_util::PathExists(new_path))
return count;
}
return -1;
}
static bool DownloadPathIsDangerous(const FilePath& download_path) {
FilePath desktop_dir;
if (!PathService::Get(chrome::DIR_USER_DESKTOP, &desktop_dir)) {
NOTREACHED();
return false;
}
return (download_path == desktop_dir);
}
// Helper to determine if a download is a Chrome extension. We should be able to
// just use the mime type, but even our own servers are not setup to serve the
// right headers yet, so we have a short-term file extension heuristic, too.
static bool IsChromeExtension(const FilePath& path,
const std::string& mime_type) {
// If the server says it is an extension, it is definitely an extension.
if (mime_type == Extension::kMimeType)
return true;
// Otherwise, it is an extension if it has the right, err, extension.
return path.Extension().size() > 1 &&
path.Extension().substr(1) == chrome::kExtensionFileExtension;
}
// DownloadItem implementation -------------------------------------------------
// Constructor for reading from the history service.
DownloadItem::DownloadItem(const DownloadCreateInfo& info)
: id_(-1),
full_path_(info.path),
url_(info.url),
referrer_url_(info.referrer_url),
mime_type_(info.mime_type),
total_bytes_(info.total_bytes),
received_bytes_(info.received_bytes),
start_tick_(base::TimeTicks()),
state_(static_cast<DownloadState>(info.state)),
start_time_(info.start_time),
db_handle_(info.db_handle),
manager_(NULL),
is_paused_(false),
open_when_complete_(false),
safety_state_(SAFE),
auto_opened_(false),
original_name_(info.original_name),
render_process_id_(-1),
request_id_(-1) {
if (state_ == IN_PROGRESS)
state_ = CANCELLED;
Init(false /* don't start progress timer */);
}
// Constructor for DownloadItem created via user action in the main thread.
DownloadItem::DownloadItem(int32 download_id,
const FilePath& path,
int path_uniquifier,
const GURL& url,
const GURL& referrer_url,
const std::string& mime_type,
const FilePath& original_name,
const base::Time start_time,
int64 download_size,
int render_process_id,
int request_id,
bool is_dangerous)
: id_(download_id),
full_path_(path),
path_uniquifier_(path_uniquifier),
url_(url),
referrer_url_(referrer_url),
mime_type_(mime_type),
total_bytes_(download_size),
received_bytes_(0),
start_tick_(base::TimeTicks::Now()),
state_(IN_PROGRESS),
start_time_(start_time),
db_handle_(kUninitializedHandle),
manager_(NULL),
is_paused_(false),
open_when_complete_(false),
safety_state_(is_dangerous ? DANGEROUS : SAFE),
auto_opened_(false),
original_name_(original_name),
render_process_id_(render_process_id),
request_id_(request_id) {
Init(true /* start progress timer */);
}
void DownloadItem::Init(bool start_timer) {
file_name_ = full_path_.BaseName();
if (start_timer)
StartProgressTimer();
}
DownloadItem::~DownloadItem() {
state_ = REMOVING;
UpdateObservers();
}
void DownloadItem::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void DownloadItem::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
void DownloadItem::UpdateObservers() {
FOR_EACH_OBSERVER(Observer, observers_, OnDownloadUpdated(this));
}
void DownloadItem::NotifyObserversDownloadOpened() {
FOR_EACH_OBSERVER(Observer, observers_, OnDownloadOpened(this));
}
// If we've received more data than we were expecting (bad server info?), revert
// to 'unknown size mode'.
void DownloadItem::UpdateSize(int64 bytes_so_far) {
received_bytes_ = bytes_so_far;
if (received_bytes_ > total_bytes_)
total_bytes_ = 0;
}
// Updates from the download thread may have been posted while this download
// was being cancelled in the UI thread, so we'll accept them unless we're
// complete.
void DownloadItem::Update(int64 bytes_so_far) {
if (state_ == COMPLETE) {
NOTREACHED();
return;
}
UpdateSize(bytes_so_far);
UpdateObservers();
}
// Triggered by a user action.
void DownloadItem::Cancel(bool update_history) {
if (state_ != IN_PROGRESS) {
// Small downloads might be complete before this method has a chance to run.
return;
}
state_ = CANCELLED;
UpdateObservers();
StopProgressTimer();
if (update_history)
manager_->DownloadCancelled(id_);
}
void DownloadItem::Finished(int64 size) {
state_ = COMPLETE;
UpdateSize(size);
UpdateObservers();
StopProgressTimer();
}
void DownloadItem::Remove(bool delete_on_disk) {
Cancel(true);
state_ = REMOVING;
if (delete_on_disk)
manager_->DeleteDownload(full_path_);
manager_->RemoveDownload(db_handle_);
// We have now been deleted.
}
void DownloadItem::StartProgressTimer() {
update_timer_.Start(base::TimeDelta::FromMilliseconds(kUpdateTimeMs), this,
&DownloadItem::UpdateObservers);
}
void DownloadItem::StopProgressTimer() {
update_timer_.Stop();
}
bool DownloadItem::TimeRemaining(base::TimeDelta* remaining) const {
if (total_bytes_ <= 0)
return false; // We never received the content_length for this download.
int64 speed = CurrentSpeed();
if (speed == 0)
return false;
*remaining =
base::TimeDelta::FromSeconds((total_bytes_ - received_bytes_) / speed);
return true;
}
int64 DownloadItem::CurrentSpeed() const {
base::TimeDelta diff = base::TimeTicks::Now() - start_tick_;
int64 diff_ms = diff.InMilliseconds();
return diff_ms == 0 ? 0 : received_bytes_ * 1000 / diff_ms;
}
int DownloadItem::PercentComplete() const {
int percent = -1;
if (total_bytes_ > 0)
percent = static_cast<int>(received_bytes_ * 100.0 / total_bytes_);
return percent;
}
void DownloadItem::Rename(const FilePath& full_path) {
DCHECK(!full_path.empty());
full_path_ = full_path;
file_name_ = full_path_.BaseName();
}
void DownloadItem::TogglePause() {
DCHECK(state_ == IN_PROGRESS);
manager_->PauseDownload(id_, !is_paused_);
is_paused_ = !is_paused_;
UpdateObservers();
}
FilePath DownloadItem::GetFileName() const {
if (safety_state_ == DownloadItem::SAFE)
return file_name_;
if (path_uniquifier_ > 0) {
FilePath name(original_name_);
AppendNumberToPath(&name, path_uniquifier_);
return name;
}
return original_name_;
}
// DownloadManager implementation ----------------------------------------------
// static
void DownloadManager::RegisterUserPrefs(PrefService* prefs) {
prefs->RegisterBooleanPref(prefs::kPromptForDownload, false);
prefs->RegisterStringPref(prefs::kDownloadExtensionsToOpen, L"");
prefs->RegisterBooleanPref(prefs::kDownloadDirUpgraded, false);
// The default download path is userprofile\download.
FilePath default_download_path;
if (!PathService::Get(chrome::DIR_DEFAULT_DOWNLOADS,
&default_download_path)) {
NOTREACHED();
}
prefs->RegisterFilePathPref(prefs::kDownloadDefaultDirectory,
default_download_path);
// If the download path is dangerous we forcefully reset it. But if we do
// so we set a flag to make sure we only do it once, to avoid fighting
// the user if he really wants it on an unsafe place such as the desktop.
if (!prefs->GetBoolean(prefs::kDownloadDirUpgraded)) {
FilePath current_download_dir = FilePath::FromWStringHack(
prefs->GetString(prefs::kDownloadDefaultDirectory));
if (DownloadPathIsDangerous(current_download_dir)) {
prefs->SetString(prefs::kDownloadDefaultDirectory,
default_download_path.ToWStringHack());
}
prefs->SetBoolean(prefs::kDownloadDirUpgraded, true);
}
}
DownloadManager::DownloadManager()
: shutdown_needed_(false),
profile_(NULL),
file_manager_(NULL),
ui_loop_(MessageLoop::current()),
file_loop_(NULL) {
}
DownloadManager::~DownloadManager() {
if (shutdown_needed_)
Shutdown();
}
void DownloadManager::Shutdown() {
DCHECK(shutdown_needed_) << "Shutdown called when not needed.";
// Stop receiving download updates
file_manager_->RemoveDownloadManager(this);
// Stop making history service requests
cancelable_consumer_.CancelAllRequests();
// 'in_progress_' may contain DownloadItems that have not finished the start
// complete (from the history service) and thus aren't in downloads_.
DownloadMap::iterator it = in_progress_.begin();
std::set<DownloadItem*> to_remove;
for (; it != in_progress_.end(); ++it) {
DownloadItem* download = it->second;
if (download->safety_state() == DownloadItem::DANGEROUS) {
// Forget about any download that the user did not approve.
// Note that we cannot call download->Remove() this would invalidate our
// iterator.
to_remove.insert(download);
continue;
}
DCHECK_EQ(DownloadItem::IN_PROGRESS, download->state());
download->Cancel(false);
UpdateHistoryForDownload(download);
if (download->db_handle() == kUninitializedHandle) {
// An invalid handle means that 'download' does not yet exist in
// 'downloads_', so we have to delete it here.
delete download;
}
}
// 'dangerous_finished_' contains all complete downloads that have not been
// approved. They should be removed.
it = dangerous_finished_.begin();
for (; it != dangerous_finished_.end(); ++it)
to_remove.insert(it->second);
// Remove the dangerous download that are not approved.
for (std::set<DownloadItem*>::const_iterator rm_it = to_remove.begin();
rm_it != to_remove.end(); ++rm_it) {
DownloadItem* download = *rm_it;
int64 handle = download->db_handle();
download->Remove(true);
// Same as above, delete the download if it is not in 'downloads_' (as the
// Remove() call above won't have deleted it).
if (handle == kUninitializedHandle)
delete download;
}
to_remove.clear();
in_progress_.clear();
dangerous_finished_.clear();
STLDeleteValues(&downloads_);
file_manager_ = NULL;
// Save our file extensions to auto open.
SaveAutoOpens();
// Make sure the save as dialog doesn't notify us back if we're gone before
// it returns.
if (select_file_dialog_.get())
select_file_dialog_->ListenerDestroyed();
shutdown_needed_ = false;
}
// Issue a history query for downloads matching 'search_text'. If 'search_text'
// is empty, return all downloads that we know about.
void DownloadManager::GetDownloads(Observer* observer,
const std::wstring& search_text) {
DCHECK(observer);
// Return a empty list if we've not yet received the set of downloads from the
// history system (we'll update all observers once we get that list in
// OnQueryDownloadEntriesComplete), or if there are no downloads at all.
std::vector<DownloadItem*> download_copy;
if (downloads_.empty()) {
observer->SetDownloads(download_copy);
return;
}
// We already know all the downloads and there is no filter, so just return a
// copy to the observer.
if (search_text.empty()) {
download_copy.reserve(downloads_.size());
for (DownloadMap::iterator it = downloads_.begin();
it != downloads_.end(); ++it) {
download_copy.push_back(it->second);
}
// We retain ownership of the DownloadItems.
observer->SetDownloads(download_copy);
return;
}
// Issue a request to the history service for a list of downloads matching
// our search text.
HistoryService* hs =
profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (hs) {
HistoryService::Handle h =
hs->SearchDownloads(search_text,
&cancelable_consumer_,
NewCallback(this,
&DownloadManager::OnSearchComplete));
cancelable_consumer_.SetClientData(hs, h, observer);
}
}
// Query the history service for information about all persisted downloads.
bool DownloadManager::Init(Profile* profile) {
DCHECK(profile);
DCHECK(!shutdown_needed_) << "DownloadManager already initialized.";
shutdown_needed_ = true;
profile_ = profile;
request_context_ = profile_->GetRequestContext();
// 'incognito mode' will have access to past downloads, but we won't store
// information about new downloads while in that mode.
QueryHistoryForDownloads();
ResourceDispatcherHost* rdh = g_browser_process->resource_dispatcher_host();
if (!rdh) {
NOTREACHED();
return false;
}
file_manager_ = rdh->download_file_manager();
if (!file_manager_) {
NOTREACHED();
return false;
}
file_loop_ = g_browser_process->file_thread()->message_loop();
if (!file_loop_) {
NOTREACHED();
return false;
}
// Get our user preference state.
PrefService* prefs = profile_->GetPrefs();
DCHECK(prefs);
prompt_for_download_.Init(prefs::kPromptForDownload, prefs, NULL);
download_path_.Init(prefs::kDownloadDefaultDirectory, prefs, NULL);
// This variable is needed to resolve which CreateDirectory we want to point
// to. Without it, the NewRunnableFunction cannot resolve the ambiguity.
// TODO(estade): when file_util::CreateDirectory(wstring) is removed,
// get rid of |CreateDirectoryPtr|.
bool (*CreateDirectoryPtr)(const FilePath&) = &file_util::CreateDirectory;
// Ensure that the download directory specified in the preferences exists.
file_loop_->PostTask(FROM_HERE, NewRunnableFunction(
CreateDirectoryPtr, download_path()));
#if defined(OS_WIN) || defined(OS_LINUX)
// We use this to determine possibly dangerous downloads.
download_util::InitializeExeTypes(&exe_types_);
#endif
// We store any file extension that should be opened automatically at
// download completion in this pref.
std::wstring extensions_to_open =
prefs->GetString(prefs::kDownloadExtensionsToOpen);
std::vector<std::wstring> extensions;
SplitString(extensions_to_open, L':', &extensions);
for (size_t i = 0; i < extensions.size(); ++i) {
if (!extensions[i].empty() && !IsExecutable(
FilePath::FromWStringHack(extensions[i]).value()))
auto_open_.insert(FilePath::FromWStringHack(extensions[i]).value());
}
return true;
}
void DownloadManager::QueryHistoryForDownloads() {
HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (hs) {
hs->QueryDownloads(
&cancelable_consumer_,
NewCallback(this, &DownloadManager::OnQueryDownloadEntriesComplete));
}
}
// We have received a message from DownloadFileManager about a new download. We
// create a download item and store it in our download map, and inform the
// history system of a new download. Since this method can be called while the
// history service thread is still reading the persistent state, we do not
// insert the new DownloadItem into 'downloads_' or inform our observers at this
// point. OnCreateDatabaseEntryComplete() handles that finalization of the the
// download creation as a callback from the history thread.
void DownloadManager::StartDownload(DownloadCreateInfo* info) {
DCHECK(MessageLoop::current() == ui_loop_);
DCHECK(info);
// Freeze the user's preference for showing a Save As dialog. We're going to
// bounce around a bunch of threads and we don't want to worry about race
// conditions where the user changes this pref out from under us.
if (*prompt_for_download_)
info->save_as = true;
// Determine the proper path for a download, by choosing either the default
// download directory, or prompting the user.
FilePath generated_name;
GenerateFilename(info, &generated_name);
if (info->save_as && !last_download_path_.empty())
info->suggested_path = last_download_path_;
else
info->suggested_path = download_path();
info->suggested_path = info->suggested_path.Append(generated_name);
if (!info->save_as) {
// Downloads can be marked as dangerous for two reasons:
// a) They have a dangerous-looking filename
// b) They are an extension that is not from the gallery
if (IsDangerous(info->suggested_path.BaseName()))
info->is_dangerous = true;
else if (IsChromeExtension(info->path, info->mime_type) &&
!ExtensionsService::IsDownloadFromGallery(info->url,
info->referrer_url)) {
info->is_dangerous = true;
}
}
// We need to move over to the download thread because we don't want to stat
// the suggested path on the UI thread.
file_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this,
&DownloadManager::CheckIfSuggestedPathExists,
info));
}
void DownloadManager::CheckIfSuggestedPathExists(DownloadCreateInfo* info) {
DCHECK(info);
// Check writability of the suggested path. If we can't write to it, default
// to the user's "My Documents" directory. We'll prompt them in this case.
FilePath dir = info->suggested_path.DirName();
FilePath filename = info->suggested_path.BaseName();
if (!file_util::PathIsWritable(dir)) {
info->save_as = true;
PathService::Get(chrome::DIR_USER_DOCUMENTS, &info->suggested_path);
info->suggested_path = info->suggested_path.Append(filename);
}
info->path_uniquifier = GetUniquePathNumber(info->suggested_path);
// If the download is deemed dangerous, we'll use a temporary name for it.
if (info->is_dangerous) {
info->original_name = FilePath(info->suggested_path).BaseName();
// Create a temporary file to hold the file until the user approves its
// download.
FilePath::StringType file_name;
FilePath path;
while (path.empty()) {
SStringPrintf(&file_name, FILE_PATH_LITERAL("unconfirmed %d.download"),
base::RandInt(0, 100000));
path = dir.Append(file_name);
if (file_util::PathExists(path))
path = FilePath();
}
info->suggested_path = path;
} else {
// We know the final path, build it if necessary.
if (info->path_uniquifier > 0) {
AppendNumberToPath(&(info->suggested_path), info->path_uniquifier);
// Setting path_uniquifier to 0 to make sure we don't try to unique it
// later on.
info->path_uniquifier = 0;
} else if (info->path_uniquifier == -1) {
// We failed to find a unique path. We have to prompt the user.
info->save_as = true;
}
}
if (!info->save_as) {
// Create an empty file at the suggested path so that we don't allocate the
// same "non-existant" path to multiple downloads.
// See: http://code.google.com/p/chromium/issues/detail?id=3662
file_util::WriteFile(info->suggested_path.ToWStringHack(), "", 0);
}
// Now we return to the UI thread.
ui_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this,
&DownloadManager::OnPathExistenceAvailable,
info));
}
void DownloadManager::OnPathExistenceAvailable(DownloadCreateInfo* info) {
DCHECK(MessageLoop::current() == ui_loop_);
DCHECK(info);
if (info->save_as) {
// We must ask the user for the place to put the download.
if (!select_file_dialog_.get())
select_file_dialog_ = SelectFileDialog::Create(this);
TabContents* contents = tab_util::GetTabContentsByID(
info->render_process_id, info->render_view_id);
SelectFileDialog::FileTypeInfo file_type_info;
file_type_info.extensions.resize(1);
file_type_info.extensions[0].push_back(info->suggested_path.Extension());
if (!file_type_info.extensions[0][0].empty())
file_type_info.extensions[0][0].erase(0, 1); // drop the .
file_type_info.include_all_files = true;
gfx::NativeWindow owning_window =
contents ? platform_util::GetTopLevel(contents->GetNativeView()) : NULL;
select_file_dialog_->SelectFile(SelectFileDialog::SELECT_SAVEAS_FILE,
string16(),
info->suggested_path,
&file_type_info, 0, FILE_PATH_LITERAL(""),
owning_window, info);
} else {
// No prompting for download, just continue with the suggested name.
ContinueStartDownload(info, info->suggested_path);
}
}
void DownloadManager::ContinueStartDownload(DownloadCreateInfo* info,
const FilePath& target_path) {
scoped_ptr<DownloadCreateInfo> infop(info);
info->path = target_path;
DownloadItem* download = NULL;
DownloadMap::iterator it = in_progress_.find(info->download_id);
if (it == in_progress_.end()) {
download = new DownloadItem(info->download_id,
info->path,
info->path_uniquifier,
info->url,
info->referrer_url,
info->mime_type,
info->original_name,
info->start_time,
info->total_bytes,
info->render_process_id,
info->request_id,
info->is_dangerous);
download->set_manager(this);
in_progress_[info->download_id] = download;
} else {
NOTREACHED(); // Should not exist!
return;
}
// Called before DownloadFinished in order to avoid a race condition where we
// attempt to open a completed download before it has been renamed.
file_loop_->PostTask(FROM_HERE,
NewRunnableMethod(file_manager_,
&DownloadFileManager::OnFinalDownloadName,
download->id(),
target_path,
this));
// If the download already completed by the time we reached this point, then
// notify observers that it did.
PendingFinishedMap::iterator pending_it =
pending_finished_downloads_.find(info->download_id);
if (pending_it != pending_finished_downloads_.end())
DownloadFinished(pending_it->first, pending_it->second);
download->Rename(target_path);
if (profile_->IsOffTheRecord()) {
// Fake a db handle for incognito mode, since nothing is actually stored in
// the database in this mode. We have to make sure that these handles don't
// collide with normal db handles, so we use a negative value. Eventually,
// they could overlap, but you'd have to do enough downloading that your ISP
// would likely stab you in the neck first. YMMV.
static int64 fake_db_handle = kUninitializedHandle - 1;
OnCreateDownloadEntryComplete(*info, fake_db_handle--);
} else {
// Update the history system with the new download.
// FIXME(paulg) see bug 958058. EXPLICIT_ACCESS below is wrong.
HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (hs) {
hs->CreateDownload(
*info, &cancelable_consumer_,
NewCallback(this, &DownloadManager::OnCreateDownloadEntryComplete));
}
}
}
// Convenience function for updating the history service for a download.
void DownloadManager::UpdateHistoryForDownload(DownloadItem* download) {
DCHECK(download);
// Don't store info in the database if the download was initiated while in
// incognito mode or if it hasn't been initialized in our database table.
if (download->db_handle() <= kUninitializedHandle)
return;
// FIXME(paulg) see bug 958058. EXPLICIT_ACCESS below is wrong.
HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (hs) {
hs->UpdateDownload(download->received_bytes(),
download->state(),
download->db_handle());
}
}
void DownloadManager::RemoveDownloadFromHistory(DownloadItem* download) {
DCHECK(download);
// FIXME(paulg) see bug 958058. EXPLICIT_ACCESS below is wrong.
HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (download->db_handle() > kUninitializedHandle && hs)
hs->RemoveDownload(download->db_handle());
}
void DownloadManager::RemoveDownloadsFromHistoryBetween(
const base::Time remove_begin,
const base::Time remove_end) {
// FIXME(paulg) see bug 958058. EXPLICIT_ACCESS below is wrong.
HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (hs)
hs->RemoveDownloadsBetween(remove_begin, remove_end);
}
void DownloadManager::UpdateDownload(int32 download_id, int64 size) {
DownloadMap::iterator it = in_progress_.find(download_id);
if (it != in_progress_.end()) {
DownloadItem* download = it->second;
download->Update(size);
UpdateHistoryForDownload(download);
}
}
void DownloadManager::DownloadFinished(int32 download_id, int64 size) {
DownloadMap::iterator it = in_progress_.find(download_id);
if (it == in_progress_.end()) {
// The download is done, but the user hasn't selected a final location for
// it yet (the Save As dialog box is probably still showing), so just keep
// track of the fact that this download id is complete, when the
// DownloadItem is constructed later we'll notify its completion then.
PendingFinishedMap::iterator erase_it =
pending_finished_downloads_.find(download_id);
DCHECK(erase_it == pending_finished_downloads_.end());
pending_finished_downloads_[download_id] = size;
return;
}
// Remove the id from the list of pending ids.
PendingFinishedMap::iterator erase_it =
pending_finished_downloads_.find(download_id);
if (erase_it != pending_finished_downloads_.end())
pending_finished_downloads_.erase(erase_it);
DownloadItem* download = it->second;
download->Finished(size);
// Clean up will happen when the history system create callback runs if we
// don't have a valid db_handle yet.
if (download->db_handle() != kUninitializedHandle) {
in_progress_.erase(it);
UpdateHistoryForDownload(download);
}
// If this a dangerous download not yet validated by the user, don't do
// anything. When the user notifies us, it will trigger a call to
// ProceedWithFinishedDangerousDownload.
if (download->safety_state() == DownloadItem::DANGEROUS) {
dangerous_finished_[download_id] = download;
return;
}
if (download->safety_state() == DownloadItem::DANGEROUS_BUT_VALIDATED) {
// We first need to rename the downloaded file from its temporary name to
// its final name before we can continue.
file_loop_->PostTask(FROM_HERE,
NewRunnableMethod(
this, &DownloadManager::ProceedWithFinishedDangerousDownload,
download->db_handle(),
download->full_path(), download->original_name()));
return;
}
ContinueDownloadFinished(download);
}
void DownloadManager::DownloadRenamedToFinalName(int download_id,
const FilePath& full_path) {
}
void DownloadManager::ContinueDownloadFinished(DownloadItem* download) {
// If this was a dangerous download, it has now been approved and must be
// removed from dangerous_finished_ so it does not get deleted on shutdown.
DownloadMap::iterator it = dangerous_finished_.find(download->id());
if (it != dangerous_finished_.end())
dangerous_finished_.erase(it);
// Open the download if the user or user prefs indicate it should be.
FilePath::StringType extension = download->full_path().Extension();
// Drop the leading period. (The auto-open list is period-less.)
if (extension.size() > 0)
extension = extension.substr(1);
// Handle chrome extensions explicitly and skip the shell execute.
if (IsChromeExtension(download->full_path(), download->mime_type())) {
OpenChromeExtension(download->full_path(), download->url(),
download->referrer_url());
download->set_auto_opened(true);
} else if (download->open_when_complete() ||
ShouldOpenFileExtension(extension)) {
OpenDownloadInShell(download, NULL);
download->set_auto_opened(true);
}
// Notify our observers that we are complete (the call to Finished() set the
// state to complete but did not notify).
download->UpdateObservers();
}
// Called on the file thread. Renames the downloaded file to its original name.
void DownloadManager::ProceedWithFinishedDangerousDownload(
int64 download_handle,
const FilePath& path,
const FilePath& original_name) {
bool success = false;
FilePath new_path;
int uniquifier = 0;
if (file_util::PathExists(path)) {
new_path = path.DirName().Append(original_name);
// Make our name unique at this point, as if a dangerous file is downloading
// and a 2nd download is started for a file with the same name, they would
// have the same path. This is because we uniquify the name on download
// start, and at that time the first file does not exists yet, so the second
// file gets the same name.
uniquifier = GetUniquePathNumber(new_path);
if (uniquifier > 0)
AppendNumberToPath(&new_path, uniquifier);
success = file_util::Move(path, new_path);
} else {
NOTREACHED();
}
ui_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this, &DownloadManager::DangerousDownloadRenamed,
download_handle, success, new_path, uniquifier));
}
// Call from the file thread when the finished dangerous download was renamed.
void DownloadManager::DangerousDownloadRenamed(int64 download_handle,
bool success,
const FilePath& new_path,
int new_path_uniquifier) {
DownloadMap::iterator it = downloads_.find(download_handle);
if (it == downloads_.end()) {
NOTREACHED();
return;
}
DownloadItem* download = it->second;
// If we failed to rename the file, we'll just keep the name as is.
if (success) {
// We need to update the path uniquifier so that the UI shows the right
// name when calling GetFileName().
download->set_path_uniquifier(new_path_uniquifier);
RenameDownload(download, new_path);
}
// Continue the download finished sequence.
ContinueDownloadFinished(download);
}
// static
// We have to tell the ResourceDispatcherHost to cancel the download from this
// thread, since we can't forward tasks from the file thread to the IO thread
// reliably (crash on shutdown race condition).
void DownloadManager::CancelDownloadRequest(int render_process_id,
int request_id) {
ResourceDispatcherHost* rdh = g_browser_process->resource_dispatcher_host();
base::Thread* io_thread = g_browser_process->io_thread();
if (!io_thread || !rdh)
return;
io_thread->message_loop()->PostTask(FROM_HERE,
NewRunnableFunction(&DownloadManager::OnCancelDownloadRequest,
rdh,
render_process_id,
request_id));
}
// static
void DownloadManager::OnCancelDownloadRequest(ResourceDispatcherHost* rdh,
int render_process_id,
int request_id) {
rdh->CancelRequest(render_process_id, request_id, false);
}
void DownloadManager::DownloadCancelled(int32 download_id) {
DownloadMap::iterator it = in_progress_.find(download_id);
if (it == in_progress_.end())
return;
DownloadItem* download = it->second;
CancelDownloadRequest(download->render_process_id(), download->request_id());
// Clean up will happen when the history system create callback runs if we
// don't have a valid db_handle yet.
if (download->db_handle() != kUninitializedHandle) {
in_progress_.erase(it);
UpdateHistoryForDownload(download);
}
// Tell the file manager to cancel the download.
file_manager_->RemoveDownload(download->id(), this); // On the UI thread
file_loop_->PostTask(FROM_HERE,
NewRunnableMethod(file_manager_,
&DownloadFileManager::CancelDownload,
download->id()));
}
void DownloadManager::PauseDownload(int32 download_id, bool pause) {
DownloadMap::iterator it = in_progress_.find(download_id);
if (it != in_progress_.end()) {
DownloadItem* download = it->second;
if (pause == download->is_paused())
return;
// Inform the ResourceDispatcherHost of the new pause state.
base::Thread* io_thread = g_browser_process->io_thread();
ResourceDispatcherHost* rdh = g_browser_process->resource_dispatcher_host();
if (!io_thread || !rdh)
return;
io_thread->message_loop()->PostTask(FROM_HERE,
NewRunnableFunction(&DownloadManager::OnPauseDownloadRequest,
rdh,
download->render_process_id(),
download->request_id(),
pause));
}
}
// static
void DownloadManager::OnPauseDownloadRequest(ResourceDispatcherHost* rdh,
int render_process_id,
int request_id,
bool pause) {
rdh->PauseRequest(render_process_id, request_id, pause);
}
bool DownloadManager::IsDangerous(const FilePath& file_name) {
// TODO(jcampan): Improve me.
FilePath::StringType extension = file_name.Extension();
// Drop the leading period.
if (extension.size() > 0)
extension = extension.substr(1);
return IsExecutable(extension);
}
void DownloadManager::RenameDownload(DownloadItem* download,
const FilePath& new_path) {
download->Rename(new_path);
// Update the history.
// No update necessary if the download was initiated while in incognito mode.
if (download->db_handle() <= kUninitializedHandle)
return;
// FIXME(paulg) see bug 958058. EXPLICIT_ACCESS below is wrong.
HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
if (hs)
hs->UpdateDownloadPath(new_path.ToWStringHack(), download->db_handle());
}
void DownloadManager::RemoveDownload(int64 download_handle) {
DownloadMap::iterator it = downloads_.find(download_handle);
if (it == downloads_.end())
return;
// Make history update.
DownloadItem* download = it->second;
RemoveDownloadFromHistory(download);
// Remove from our tables and delete.
downloads_.erase(it);
it = dangerous_finished_.find(download->id());
if (it != dangerous_finished_.end())
dangerous_finished_.erase(it);
// Tell observers to refresh their views.
FOR_EACH_OBSERVER(Observer, observers_, ModelChanged());
delete download;
}
int DownloadManager::RemoveDownloadsBetween(const base::Time remove_begin,
const base::Time remove_end) {
RemoveDownloadsFromHistoryBetween(remove_begin, remove_end);
DownloadMap::iterator it = downloads_.begin();
std::vector<DownloadItem*> pending_deletes;
while (it != downloads_.end()) {
DownloadItem* download = it->second;
DownloadItem::DownloadState state = download->state();
if (download->start_time() >= remove_begin &&
(remove_end.is_null() || download->start_time() < remove_end) &&
(state == DownloadItem::COMPLETE ||
state == DownloadItem::CANCELLED)) {
// Remove from the map and move to the next in the list.
downloads_.erase(it++);
// Also remove it from any completed dangerous downloads.
DownloadMap::iterator dit = dangerous_finished_.find(download->id());
if (dit != dangerous_finished_.end())
dangerous_finished_.erase(dit);
pending_deletes.push_back(download);
continue;
}
++it;
}
// Tell observers to refresh their views.
int num_deleted = static_cast<int>(pending_deletes.size());
if (num_deleted > 0)
FOR_EACH_OBSERVER(Observer, observers_, ModelChanged());
// Delete the download items after updating the observers.
STLDeleteContainerPointers(pending_deletes.begin(), pending_deletes.end());
pending_deletes.clear();
return num_deleted;
}
int DownloadManager::RemoveDownloads(const base::Time remove_begin) {
return RemoveDownloadsBetween(remove_begin, base::Time());
}
int DownloadManager::RemoveAllDownloads() {
// The null times make the date range unbounded.
return RemoveDownloadsBetween(base::Time(), base::Time());
}
// Initiate a download of a specific URL. We send the request to the
// ResourceDispatcherHost, and let it send us responses like a regular
// download.
void DownloadManager::DownloadUrl(const GURL& url,
const GURL& referrer,
const std::string& referrer_charset,
TabContents* tab_contents) {
DCHECK(tab_contents);
request_context_->set_referrer_charset(referrer_charset);
file_manager_->DownloadUrl(url,
referrer,
tab_contents->process()->pid(),
tab_contents->render_view_host()->routing_id(),
request_context_.get());
}
void DownloadManager::GenerateExtension(
const FilePath& file_name,
const std::string& mime_type,
FilePath::StringType* generated_extension) {
// We're worried about three things here:
//
// 1) Security. Many sites let users upload content, such as buddy icons, to
// their web sites. We want to mitigate the case where an attacker
// supplies a malicious executable with an executable file extension but an
// honest site serves the content with a benign content type, such as
// image/jpeg.
//
// 2) Usability. If the site fails to provide a file extension, we want to
// guess a reasonable file extension based on the content type.
//
// 3) Shell integration. Some file extensions automatically integrate with
// the shell. We block these extensions to prevent a malicious web site
// from integrating with the user's shell.
static const FilePath::CharType default_extension[] =
FILE_PATH_LITERAL("download");
// See if our file name already contains an extension.
FilePath::StringType extension(
file_util::GetFileExtensionFromPath(file_name));
#if defined(OS_WIN)
// Rename shell-integrated extensions.
if (win_util::IsShellIntegratedExtension(extension))
extension.assign(default_extension);
#endif
std::string mime_type_from_extension;
net::GetMimeTypeFromFile(file_name,
&mime_type_from_extension);
if (mime_type == mime_type_from_extension) {
// The hinted extension matches the mime type. It looks like a winner.
generated_extension->swap(extension);
return;
}
if (IsExecutable(extension) && !IsExecutableMimeType(mime_type)) {
// We want to be careful about executable extensions. The worry here is
// that a trusted web site could be tricked into dropping an executable file
// on the user's filesystem.
if (!net::GetPreferredExtensionForMimeType(mime_type, &extension)) {
// We couldn't find a good extension for this content type. Use a dummy
// extension instead.
extension.assign(default_extension);
}
}
if (extension.empty()) {
net::GetPreferredExtensionForMimeType(mime_type, &extension);
} else {
// Append extension generated from the mime type if:
// 1. New extension is not ".txt"
// 2. New extension is not the same as the already existing extension.
// 3. New extension is not executable. This action mitigates the case when
// an executable is hidden in a benign file extension;
// E.g. my-cat.jpg becomes my-cat.jpg.js if content type is
// application/x-javascript.
// 4. New extension is not ".tar" for .gz files. For misconfigured web
// servers, i.e. bug 5772.
FilePath::StringType append_extension;
if (net::GetPreferredExtensionForMimeType(mime_type, &append_extension)) {
if (append_extension != FILE_PATH_LITERAL("txt") &&
append_extension != extension &&
!IsExecutable(append_extension) &&
(append_extension != FILE_PATH_LITERAL("tar") ||
extension != FILE_PATH_LITERAL("gz"))) {
extension += FILE_PATH_LITERAL(".");
extension += append_extension;
}
}
}
generated_extension->swap(extension);
}
void DownloadManager::GenerateFilename(DownloadCreateInfo* info,
FilePath* generated_name) {
*generated_name = FilePath::FromWStringHack(
net::GetSuggestedFilename(GURL(info->url),
info->content_disposition,
info->referrer_charset,
L"download"));
DCHECK(!generated_name->empty());
GenerateSafeFilename(info->mime_type, generated_name);
}
void DownloadManager::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
observer->ModelChanged();
}
void DownloadManager::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
// Post Windows Shell operations to the Download thread, to avoid blocking the
// user interface.
void DownloadManager::ShowDownloadInShell(const DownloadItem* download) {
DCHECK(file_manager_);
file_loop_->PostTask(FROM_HERE,
NewRunnableMethod(file_manager_,
&DownloadFileManager::OnShowDownloadInShell,
FilePath(download->full_path())));
}
void DownloadManager::OpenDownload(const DownloadItem* download,
gfx::NativeView parent_window) {
// Open Chrome extensions with ExtensionsService. For everything else do shell
// execute.
if (IsChromeExtension(download->full_path(), download->mime_type())) {
OpenChromeExtension(download->full_path(), download->url(),
download->referrer_url());
} else {
OpenDownloadInShell(download, parent_window);
}
}
void DownloadManager::OpenChromeExtension(const FilePath& full_path,
const GURL& download_url,
const GURL& referrer_url) {
// We don't support extensions in OTR mode.
if (profile_->GetExtensionsService())
profile_->GetExtensionsService()->InstallExtension(full_path, download_url,
referrer_url);
}
void DownloadManager::OpenDownloadInShell(const DownloadItem* download,
gfx::NativeView parent_window) {
DCHECK(file_manager_);
file_loop_->PostTask(FROM_HERE,
NewRunnableMethod(file_manager_,
&DownloadFileManager::OnOpenDownloadInShell,
download->full_path(), download->url(), parent_window));
}
void DownloadManager::OpenFilesOfExtension(
const FilePath::StringType& extension, bool open) {
if (open && !IsExecutable(extension))
auto_open_.insert(extension);
else
auto_open_.erase(extension);
SaveAutoOpens();
}
bool DownloadManager::ShouldOpenFileExtension(
const FilePath::StringType& extension) {
// Special-case Chrome extensions as always-open.
if (!IsExecutable(extension) &&
(auto_open_.find(extension) != auto_open_.end() ||
Extension::IsExtension(FilePath(extension))))
return true;
return false;
}
static const char* kExecutableWhiteList[] = {
// JavaScript is just as powerful as EXE.
"text/javascript",
"text/javascript;version=*",
// Registry files can cause critical changes to the MS OS behavior.
// Addition of this mimetype also addresses bug 7337.
"text/x-registry",
// Some sites use binary/octet-stream to mean application/octet-stream.
// See http://code.google.com/p/chromium/issues/detail?id=1573
"binary/octet-stream"
};
static const char* kExecutableBlackList[] = {
// These application types are not executable.
"application/*+xml",
"application/xml"
};
// static
bool DownloadManager::IsExecutableMimeType(const std::string& mime_type) {
for (size_t i = 0; i < arraysize(kExecutableWhiteList); ++i) {
if (net::MatchesMimeType(kExecutableWhiteList[i], mime_type))
return true;
}
for (size_t i = 0; i < arraysize(kExecutableBlackList); ++i) {
if (net::MatchesMimeType(kExecutableBlackList[i], mime_type))
return false;
}
// We consider only other application types to be executable.
return net::MatchesMimeType("application/*", mime_type);
}
bool DownloadManager::IsExecutable(const FilePath::StringType& extension) {
#if defined(OS_MACOSX)
// We don't have dangerous download support on mac yet.
return false;
#else
if (!IsStringASCII(extension))
return false;
#if defined(OS_WIN)
std::string ascii_extension = WideToASCII(extension);
#elif defined(OS_LINUX)
std::string ascii_extension = extension;
#endif
StringToLowerASCII(&ascii_extension);
return exe_types_.find(ascii_extension) != exe_types_.end();
#endif // !defined(OS_MACOSX)
}
void DownloadManager::ResetAutoOpenFiles() {
auto_open_.clear();
SaveAutoOpens();
}
bool DownloadManager::HasAutoOpenFileTypesRegistered() const {
return !auto_open_.empty();
}
void DownloadManager::SaveAutoOpens() {
PrefService* prefs = profile_->GetPrefs();
if (prefs) {
FilePath::StringType extensions;
for (std::set<FilePath::StringType>::iterator it = auto_open_.begin();
it != auto_open_.end(); ++it) {
extensions += *it + FILE_PATH_LITERAL(":");
}
if (!extensions.empty())
extensions.erase(extensions.size() - 1);
std::wstring extensions_w;
#if defined(OS_WIN)
extensions_w = extensions;
#elif defined(OS_POSIX)
extensions_w = base::SysNativeMBToWide(extensions);
#endif
prefs->SetString(prefs::kDownloadExtensionsToOpen, extensions_w);
}
}
void DownloadManager::FileSelected(const FilePath& path,
int index, void* params) {
DownloadCreateInfo* info = reinterpret_cast<DownloadCreateInfo*>(params);
if (info->save_as)
last_download_path_ = path.DirName();
ContinueStartDownload(info, path);
}
void DownloadManager::FileSelectionCanceled(void* params) {
// The user didn't pick a place to save the file, so need to cancel the
// download that's already in progress to the temporary location.
DownloadCreateInfo* info = reinterpret_cast<DownloadCreateInfo*>(params);
file_loop_->PostTask(FROM_HERE,
NewRunnableMethod(file_manager_, &DownloadFileManager::CancelDownload,
info->download_id));
}
void DownloadManager::DeleteDownload(const FilePath& path) {
file_loop_->PostTask(FROM_HERE, NewRunnableFunction(
&DownloadFileManager::DeleteFile, FilePath(path)));
}
void DownloadManager::DangerousDownloadValidated(DownloadItem* download) {
DCHECK_EQ(DownloadItem::DANGEROUS, download->safety_state());
download->set_safety_state(DownloadItem::DANGEROUS_BUT_VALIDATED);
download->UpdateObservers();
// If the download is not complete, nothing to do. The required
// post-processing will be performed when it does complete.
if (download->state() != DownloadItem::COMPLETE)
return;
file_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this,
&DownloadManager::ProceedWithFinishedDangerousDownload,
download->db_handle(), download->full_path(),
download->original_name()));
}
void DownloadManager::GenerateSafeFilename(const std::string& mime_type,
FilePath* file_name) {
// Make sure we get the right file extension
FilePath::StringType extension;
GenerateExtension(*file_name, mime_type, &extension);
file_util::ReplaceExtension(file_name, extension);
#if defined(OS_WIN)
// Prepend "_" to the file name if it's a reserved name
FilePath::StringType leaf_name = file_name->BaseName().value();
DCHECK(!leaf_name.empty());
if (win_util::IsReservedName(leaf_name)) {
leaf_name = FilePath::StringType(FILE_PATH_LITERAL("_")) + leaf_name;
*file_name = file_name->DirName();
if (file_name->value() == FilePath::kCurrentDirectory) {
*file_name = FilePath(leaf_name);
} else {
*file_name = file_name->Append(leaf_name);
}
}
#elif defined(OS_POSIX)
NOTIMPLEMENTED();
#endif
}
// Operations posted to us from the history service ----------------------------
// The history service has retrieved all download entries. 'entries' contains
// 'DownloadCreateInfo's in sorted order (by ascending start_time).
void DownloadManager::OnQueryDownloadEntriesComplete(
std::vector<DownloadCreateInfo>* entries) {
for (size_t i = 0; i < entries->size(); ++i) {
DownloadItem* download = new DownloadItem(entries->at(i));
DCHECK(downloads_.find(download->db_handle()) == downloads_.end());
downloads_[download->db_handle()] = download;
download->set_manager(this);
}
FOR_EACH_OBSERVER(Observer, observers_, ModelChanged());
}
// Once the new DownloadItem's creation info has been committed to the history
// service, we associate the DownloadItem with the db handle, update our
// 'downloads_' map and inform observers.
void DownloadManager::OnCreateDownloadEntryComplete(DownloadCreateInfo info,
int64 db_handle) {
DownloadMap::iterator it = in_progress_.find(info.download_id);
DCHECK(it != in_progress_.end());
DownloadItem* download = it->second;
DCHECK(download->db_handle() == kUninitializedHandle);
download->set_db_handle(db_handle);
// Insert into our full map.
DCHECK(downloads_.find(download->db_handle()) == downloads_.end());
downloads_[download->db_handle()] = download;
// Show in the appropropriate browser UI.
ShowDownloadInBrowser(info, download);
// Inform interested objects about the new download.
FOR_EACH_OBSERVER(Observer, observers_, ModelChanged());
// If this download has been completed before we've received the db handle,
// post one final message to the history service so that it can be properly
// in sync with the DownloadItem's completion status, and also inform any
// observers so that they get more than just the start notification.
if (download->state() != DownloadItem::IN_PROGRESS) {
in_progress_.erase(it);
UpdateHistoryForDownload(download);
download->UpdateObservers();
}
}
// Called when the history service has retrieved the list of downloads that
// match the search text.
void DownloadManager::OnSearchComplete(HistoryService::Handle handle,
std::vector<int64>* results) {
HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
Observer* requestor = cancelable_consumer_.GetClientData(hs, handle);
if (!requestor)
return;
std::vector<DownloadItem*> searched_downloads;
for (std::vector<int64>::iterator it = results->begin();
it != results->end(); ++it) {
DownloadMap::iterator dit = downloads_.find(*it);
if (dit != downloads_.end())
searched_downloads.push_back(dit->second);
}
requestor->SetDownloads(searched_downloads);
}
void DownloadManager::ShowDownloadInBrowser(const DownloadCreateInfo& info,
DownloadItem* download) {
// The 'contents' may no longer exist if the user closed the tab before we get
// this start completion event. If it does, tell the origin TabContents to
// display its download shelf.
TabContents* contents =
tab_util::GetTabContentsByID(info.render_process_id, info.render_view_id);
// If the contents no longer exists, we start the download in the last active
// browser. This is not ideal but better than fully hiding the download from
// the user.
if (!contents) {
Browser* last_active = BrowserList::GetLastActive();
if (last_active)
contents = last_active->GetSelectedTabContents();
}
if (contents)
contents->OnStartDownload(download);
}
// Clears the last download path, used to initialize "save as" dialogs.
void DownloadManager::ClearLastDownloadPath() {
last_download_path_ = FilePath();
}