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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/ui/webui/downloads_dom_handler.h"
      6 
      7 #include <algorithm>
      8 #include <functional>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/bind.h"
     12 #include "base/bind_helpers.h"
     13 #include "base/i18n/rtl.h"
     14 #include "base/i18n/time_formatting.h"
     15 #include "base/memory/singleton.h"
     16 #include "base/metrics/field_trial.h"
     17 #include "base/metrics/histogram.h"
     18 #include "base/prefs/pref_service.h"
     19 #include "base/strings/string_piece.h"
     20 #include "base/strings/utf_string_conversions.h"
     21 #include "base/threading/thread.h"
     22 #include "base/value_conversions.h"
     23 #include "base/values.h"
     24 #include "chrome/browser/browser_process.h"
     25 #include "chrome/browser/download/download_crx_util.h"
     26 #include "chrome/browser/download/download_danger_prompt.h"
     27 #include "chrome/browser/download/download_history.h"
     28 #include "chrome/browser/download/download_item_model.h"
     29 #include "chrome/browser/download/download_prefs.h"
     30 #include "chrome/browser/download/download_query.h"
     31 #include "chrome/browser/download/download_service.h"
     32 #include "chrome/browser/download/download_service_factory.h"
     33 #include "chrome/browser/download/drag_download_item.h"
     34 #include "chrome/browser/extensions/api/downloads/downloads_api.h"
     35 #include "chrome/browser/extensions/extension_service.h"
     36 #include "chrome/browser/extensions/extension_system.h"
     37 #include "chrome/browser/platform_util.h"
     38 #include "chrome/browser/profiles/profile.h"
     39 #include "chrome/browser/ui/webui/fileicon_source.h"
     40 #include "chrome/common/pref_names.h"
     41 #include "chrome/common/url_constants.h"
     42 #include "content/public/browser/browser_thread.h"
     43 #include "content/public/browser/download_item.h"
     44 #include "content/public/browser/url_data_source.h"
     45 #include "content/public/browser/user_metrics.h"
     46 #include "content/public/browser/web_contents.h"
     47 #include "content/public/browser/web_contents_view.h"
     48 #include "content/public/browser/web_ui.h"
     49 #include "grit/generated_resources.h"
     50 #include "net/base/net_util.h"
     51 #include "ui/base/l10n/time_format.h"
     52 #include "ui/gfx/image/image.h"
     53 
     54 using content::BrowserContext;
     55 using content::BrowserThread;
     56 using content::UserMetricsAction;
     57 
     58 namespace {
     59 
     60 // Maximum number of downloads to show. TODO(glen): Remove this and instead
     61 // stuff the downloads down the pipe slowly.
     62 static const size_t kMaxDownloads = 150;
     63 
     64 enum DownloadsDOMEvent {
     65   DOWNLOADS_DOM_EVENT_GET_DOWNLOADS = 0,
     66   DOWNLOADS_DOM_EVENT_OPEN_FILE = 1,
     67   DOWNLOADS_DOM_EVENT_DRAG = 2,
     68   DOWNLOADS_DOM_EVENT_SAVE_DANGEROUS = 3,
     69   DOWNLOADS_DOM_EVENT_DISCARD_DANGEROUS = 4,
     70   DOWNLOADS_DOM_EVENT_SHOW = 5,
     71   DOWNLOADS_DOM_EVENT_PAUSE = 6,
     72   DOWNLOADS_DOM_EVENT_REMOVE = 7,
     73   DOWNLOADS_DOM_EVENT_CANCEL = 8,
     74   DOWNLOADS_DOM_EVENT_CLEAR_ALL = 9,
     75   DOWNLOADS_DOM_EVENT_OPEN_FOLDER = 10,
     76   DOWNLOADS_DOM_EVENT_RESUME = 11,
     77   DOWNLOADS_DOM_EVENT_MAX
     78 };
     79 
     80 void CountDownloadsDOMEvents(DownloadsDOMEvent event) {
     81   UMA_HISTOGRAM_ENUMERATION("Download.DOMEvent",
     82                             event,
     83                             DOWNLOADS_DOM_EVENT_MAX);
     84 }
     85 
     86 // Returns a string constant to be used as the |danger_type| value in
     87 // CreateDownloadItemValue().  Only return strings for DANGEROUS_FILE,
     88 // DANGEROUS_URL, DANGEROUS_CONTENT, and UNCOMMON_CONTENT because the
     89 // |danger_type| value is only defined if the value of |state| is |DANGEROUS|.
     90 const char* GetDangerTypeString(content::DownloadDangerType danger_type) {
     91   switch (danger_type) {
     92     case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE:
     93       return "DANGEROUS_FILE";
     94     case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL:
     95       return "DANGEROUS_URL";
     96     case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT:
     97       return "DANGEROUS_CONTENT";
     98     case content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT:
     99       return "UNCOMMON_CONTENT";
    100     case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST:
    101       return "DANGEROUS_HOST";
    102     case content::DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED:
    103       return "POTENTIALLY_UNWANTED";
    104     default:
    105       // Don't return a danger type string if it is NOT_DANGEROUS or
    106       // MAYBE_DANGEROUS_CONTENT.
    107       NOTREACHED();
    108       return "";
    109   }
    110 }
    111 
    112 // Returns a JSON dictionary containing some of the attributes of |download|.
    113 // The JSON dictionary will also have a field "id" set to |id|, and a field
    114 // "otr" set to |incognito|.
    115 DictionaryValue* CreateDownloadItemValue(
    116     content::DownloadItem* download_item,
    117     bool incognito) {
    118   // TODO(asanka): Move towards using download_model here for getting status and
    119   // progress. The difference currently only matters to Drive downloads and
    120   // those don't show up on the downloads page, but should.
    121   DownloadItemModel download_model(download_item);
    122   DictionaryValue* file_value = new DictionaryValue();
    123 
    124   file_value->SetInteger(
    125       "started", static_cast<int>(download_item->GetStartTime().ToTimeT()));
    126   file_value->SetString(
    127       "since_string", ui::TimeFormat::RelativeDate(
    128           download_item->GetStartTime(), NULL));
    129   file_value->SetString(
    130       "date_string", base::TimeFormatShortDate(download_item->GetStartTime()));
    131   file_value->SetInteger("id", download_item->GetId());
    132 
    133   base::FilePath download_path(download_item->GetTargetFilePath());
    134   file_value->Set("file_path", base::CreateFilePathValue(download_path));
    135   file_value->SetString("file_url",
    136                         net::FilePathToFileURL(download_path).spec());
    137 
    138   DownloadedByExtension* by_ext = DownloadedByExtension::Get(download_item);
    139   if (by_ext) {
    140     file_value->SetString("by_ext_id", by_ext->id());
    141     file_value->SetString("by_ext_name", by_ext->name());
    142     // Lookup the extension's current name() in case the user changed their
    143     // language. This won't work if the extension was uninstalled, so the name
    144     // might be the wrong language.
    145     bool include_disabled = true;
    146     const extensions::Extension* extension = extensions::ExtensionSystem::Get(
    147         Profile::FromBrowserContext(download_item->GetBrowserContext()))->
    148       extension_service()->GetExtensionById(by_ext->id(), include_disabled);
    149     if (extension)
    150       file_value->SetString("by_ext_name", extension->name());
    151   }
    152 
    153   // Keep file names as LTR.
    154   base::string16 file_name =
    155     download_item->GetFileNameToReportUser().LossyDisplayName();
    156   file_name = base::i18n::GetDisplayStringInLTRDirectionality(file_name);
    157   file_value->SetString("file_name", file_name);
    158   file_value->SetString("url", download_item->GetURL().spec());
    159   file_value->SetBoolean("otr", incognito);
    160   file_value->SetInteger("total", static_cast<int>(
    161       download_item->GetTotalBytes()));
    162   file_value->SetBoolean("file_externally_removed",
    163                          download_item->GetFileExternallyRemoved());
    164   file_value->SetBoolean("retry", false); // Overridden below if needed.
    165   file_value->SetBoolean("resume", download_item->CanResume());
    166 
    167   switch (download_item->GetState()) {
    168     case content::DownloadItem::IN_PROGRESS:
    169       if (download_item->IsDangerous()) {
    170         file_value->SetString("state", "DANGEROUS");
    171         // These are the only danger states that the UI is equipped to handle.
    172         DCHECK(download_item->GetDangerType() ==
    173                    content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE ||
    174                download_item->GetDangerType() ==
    175                    content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL ||
    176                download_item->GetDangerType() ==
    177                    content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT ||
    178                download_item->GetDangerType() ==
    179                    content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT ||
    180                download_item->GetDangerType() ==
    181                    content::DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST ||
    182                download_item->GetDangerType() ==
    183                    content::DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED);
    184         const char* danger_type_value =
    185             GetDangerTypeString(download_item->GetDangerType());
    186         file_value->SetString("danger_type", danger_type_value);
    187       } else if (download_item->IsPaused()) {
    188         file_value->SetString("state", "PAUSED");
    189       } else {
    190         file_value->SetString("state", "IN_PROGRESS");
    191       }
    192       file_value->SetString("progress_status_text",
    193                             download_model.GetTabProgressStatusText());
    194 
    195       file_value->SetInteger("percent",
    196           static_cast<int>(download_item->PercentComplete()));
    197       file_value->SetInteger("received",
    198           static_cast<int>(download_item->GetReceivedBytes()));
    199       break;
    200 
    201     case content::DownloadItem::INTERRUPTED:
    202       file_value->SetString("state", "INTERRUPTED");
    203 
    204       file_value->SetString("progress_status_text",
    205                             download_model.GetTabProgressStatusText());
    206 
    207       file_value->SetInteger("percent",
    208           static_cast<int>(download_item->PercentComplete()));
    209       file_value->SetInteger("received",
    210           static_cast<int>(download_item->GetReceivedBytes()));
    211       file_value->SetString("last_reason_text",
    212                             download_model.GetInterruptReasonText());
    213       if (content::DOWNLOAD_INTERRUPT_REASON_CRASH ==
    214           download_item->GetLastReason() && !download_item->CanResume())
    215         file_value->SetBoolean("retry", true);
    216       break;
    217 
    218     case content::DownloadItem::CANCELLED:
    219       file_value->SetString("state", "CANCELLED");
    220       file_value->SetBoolean("retry", true);
    221       break;
    222 
    223     case content::DownloadItem::COMPLETE:
    224       DCHECK(!download_item->IsDangerous());
    225       file_value->SetString("state", "COMPLETE");
    226       break;
    227 
    228     case content::DownloadItem::MAX_DOWNLOAD_STATE:
    229       NOTREACHED() << "state undefined";
    230   }
    231 
    232   return file_value;
    233 }
    234 
    235 // Filters out extension downloads and downloads that don't have a filename yet.
    236 bool IsDownloadDisplayable(const content::DownloadItem& item) {
    237   return (!download_crx_util::IsExtensionDownload(item) &&
    238           !item.IsTemporary() &&
    239           !item.GetFileNameToReportUser().empty() &&
    240           !item.GetTargetFilePath().empty());
    241 }
    242 
    243 }  // namespace
    244 
    245 DownloadsDOMHandler::DownloadsDOMHandler(content::DownloadManager* dlm)
    246     : main_notifier_(dlm, this),
    247       update_scheduled_(false),
    248       weak_ptr_factory_(this) {
    249   // Create our fileicon data source.
    250   Profile* profile = Profile::FromBrowserContext(dlm->GetBrowserContext());
    251   content::URLDataSource::Add(profile, new FileIconSource());
    252 
    253   if (profile->IsOffTheRecord()) {
    254     original_notifier_.reset(new AllDownloadItemNotifier(
    255         BrowserContext::GetDownloadManager(profile->GetOriginalProfile()),
    256         this));
    257   }
    258 }
    259 
    260 DownloadsDOMHandler::~DownloadsDOMHandler() {
    261 }
    262 
    263 // DownloadsDOMHandler, public: -----------------------------------------------
    264 
    265 void DownloadsDOMHandler::OnPageLoaded(const base::ListValue* args) {
    266   SendCurrentDownloads();
    267 }
    268 
    269 void DownloadsDOMHandler::RegisterMessages() {
    270   web_ui()->RegisterMessageCallback("onPageLoaded",
    271       base::Bind(&DownloadsDOMHandler::OnPageLoaded,
    272                  weak_ptr_factory_.GetWeakPtr()));
    273   web_ui()->RegisterMessageCallback("getDownloads",
    274       base::Bind(&DownloadsDOMHandler::HandleGetDownloads,
    275                  weak_ptr_factory_.GetWeakPtr()));
    276   web_ui()->RegisterMessageCallback("openFile",
    277       base::Bind(&DownloadsDOMHandler::HandleOpenFile,
    278                  weak_ptr_factory_.GetWeakPtr()));
    279   web_ui()->RegisterMessageCallback("drag",
    280       base::Bind(&DownloadsDOMHandler::HandleDrag,
    281                  weak_ptr_factory_.GetWeakPtr()));
    282   web_ui()->RegisterMessageCallback("saveDangerous",
    283       base::Bind(&DownloadsDOMHandler::HandleSaveDangerous,
    284                  weak_ptr_factory_.GetWeakPtr()));
    285   web_ui()->RegisterMessageCallback("discardDangerous",
    286       base::Bind(&DownloadsDOMHandler::HandleDiscardDangerous,
    287                  weak_ptr_factory_.GetWeakPtr()));
    288   web_ui()->RegisterMessageCallback("show",
    289       base::Bind(&DownloadsDOMHandler::HandleShow,
    290                  weak_ptr_factory_.GetWeakPtr()));
    291   web_ui()->RegisterMessageCallback("pause",
    292       base::Bind(&DownloadsDOMHandler::HandlePause,
    293                  weak_ptr_factory_.GetWeakPtr()));
    294   web_ui()->RegisterMessageCallback("resume",
    295       base::Bind(&DownloadsDOMHandler::HandleResume,
    296                  weak_ptr_factory_.GetWeakPtr()));
    297   web_ui()->RegisterMessageCallback("remove",
    298       base::Bind(&DownloadsDOMHandler::HandleRemove,
    299                  weak_ptr_factory_.GetWeakPtr()));
    300   web_ui()->RegisterMessageCallback("cancel",
    301       base::Bind(&DownloadsDOMHandler::HandleCancel,
    302                  weak_ptr_factory_.GetWeakPtr()));
    303   web_ui()->RegisterMessageCallback("clearAll",
    304       base::Bind(&DownloadsDOMHandler::HandleClearAll,
    305                  weak_ptr_factory_.GetWeakPtr()));
    306   web_ui()->RegisterMessageCallback("openDownloadsFolder",
    307       base::Bind(&DownloadsDOMHandler::HandleOpenDownloadsFolder,
    308                  weak_ptr_factory_.GetWeakPtr()));
    309 }
    310 
    311 void DownloadsDOMHandler::OnDownloadCreated(
    312     content::DownloadManager* manager, content::DownloadItem* download_item) {
    313   if (IsDownloadDisplayable(*download_item))
    314     ScheduleSendCurrentDownloads();
    315 }
    316 
    317 void DownloadsDOMHandler::OnDownloadUpdated(
    318     content::DownloadManager* manager,
    319     content::DownloadItem* download_item) {
    320   if (IsDownloadDisplayable(*download_item)) {
    321     if (search_terms_ && !search_terms_->empty()) {
    322       // Don't CallDownloadUpdated() if download_item doesn't match
    323       // search_terms_.
    324       // TODO(benjhayden): Consider splitting MatchesQuery() out to a function.
    325       content::DownloadManager::DownloadVector all_items, filtered_items;
    326       all_items.push_back(download_item);
    327       DownloadQuery query;
    328       query.AddFilter(DownloadQuery::FILTER_QUERY, *search_terms_.get());
    329       query.Search(all_items.begin(), all_items.end(), &filtered_items);
    330       if (filtered_items.empty())
    331         return;
    332     }
    333     base::ListValue results_value;
    334     results_value.Append(CreateDownloadItemValue(
    335         download_item,
    336         (original_notifier_.get() &&
    337           (manager == main_notifier_.GetManager()))));
    338     CallDownloadUpdated(results_value);
    339   }
    340 }
    341 
    342 void DownloadsDOMHandler::OnDownloadRemoved(
    343     content::DownloadManager* manager,
    344     content::DownloadItem* download_item) {
    345   // This relies on |download_item| being removed from DownloadManager in this
    346   // MessageLoop iteration. |download_item| may not have been removed from
    347   // DownloadManager when OnDownloadRemoved() is fired, so bounce off the
    348   // MessageLoop to give it a chance to be removed. SendCurrentDownloads() looks
    349   // at all downloads, and we do not tell it that |download_item| is being
    350   // removed. If DownloadManager is ever changed to not immediately remove
    351   // |download_item| from its map when OnDownloadRemoved is sent, then
    352   // DownloadsDOMHandler::OnDownloadRemoved() will need to explicitly tell
    353   // SendCurrentDownloads() that |download_item| was removed. A
    354   // SupportsUserData::Data would be the correct way to do this.
    355   ScheduleSendCurrentDownloads();
    356 }
    357 
    358 void DownloadsDOMHandler::HandleGetDownloads(const base::ListValue* args) {
    359   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_GET_DOWNLOADS);
    360   search_terms_.reset((args && !args->empty()) ? args->DeepCopy() : NULL);
    361   SendCurrentDownloads();
    362 }
    363 
    364 void DownloadsDOMHandler::HandleOpenFile(const base::ListValue* args) {
    365   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_OPEN_FILE);
    366   content::DownloadItem* file = GetDownloadByValue(args);
    367   if (file)
    368     file->OpenDownload();
    369 }
    370 
    371 void DownloadsDOMHandler::HandleDrag(const base::ListValue* args) {
    372   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_DRAG);
    373   content::DownloadItem* file = GetDownloadByValue(args);
    374   if (!file)
    375     return;
    376 
    377   content::WebContents* web_contents = GetWebUIWebContents();
    378   // |web_contents| is only NULL in the test.
    379   if (!web_contents)
    380     return;
    381 
    382   if (file->GetState() != content::DownloadItem::COMPLETE)
    383     return;
    384 
    385   gfx::Image* icon = g_browser_process->icon_manager()->LookupIconFromFilepath(
    386       file->GetTargetFilePath(), IconLoader::NORMAL);
    387   gfx::NativeView view = web_contents->GetView()->GetNativeView();
    388   {
    389     // Enable nested tasks during DnD, while |DragDownload()| blocks.
    390     base::MessageLoop::ScopedNestableTaskAllower allow(
    391         base::MessageLoop::current());
    392     DragDownloadItem(file, icon, view);
    393   }
    394 }
    395 
    396 void DownloadsDOMHandler::HandleSaveDangerous(const base::ListValue* args) {
    397   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_SAVE_DANGEROUS);
    398   content::DownloadItem* file = GetDownloadByValue(args);
    399   if (file)
    400     ShowDangerPrompt(file);
    401 }
    402 
    403 void DownloadsDOMHandler::HandleDiscardDangerous(const base::ListValue* args) {
    404   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_DISCARD_DANGEROUS);
    405   content::DownloadItem* file = GetDownloadByValue(args);
    406   if (file)
    407     file->Remove();
    408 }
    409 
    410 void DownloadsDOMHandler::HandleShow(const base::ListValue* args) {
    411   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_SHOW);
    412   content::DownloadItem* file = GetDownloadByValue(args);
    413   if (file)
    414     file->ShowDownloadInShell();
    415 }
    416 
    417 void DownloadsDOMHandler::HandlePause(const base::ListValue* args) {
    418   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_PAUSE);
    419   content::DownloadItem* file = GetDownloadByValue(args);
    420   if (file)
    421     file->Pause();
    422 }
    423 
    424 void DownloadsDOMHandler::HandleResume(const base::ListValue* args) {
    425   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_RESUME);
    426   content::DownloadItem* file = GetDownloadByValue(args);
    427   if (file)
    428     file->Resume();
    429 }
    430 
    431 void DownloadsDOMHandler::HandleRemove(const base::ListValue* args) {
    432   if (!IsDeletingHistoryAllowed())
    433     return;
    434 
    435   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_REMOVE);
    436   content::DownloadItem* file = GetDownloadByValue(args);
    437   if (file)
    438     file->Remove();
    439 }
    440 
    441 void DownloadsDOMHandler::HandleCancel(const base::ListValue* args) {
    442   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_CANCEL);
    443   content::DownloadItem* file = GetDownloadByValue(args);
    444   if (file)
    445     file->Cancel(true);
    446 }
    447 
    448 void DownloadsDOMHandler::HandleClearAll(const base::ListValue* args) {
    449   if (IsDeletingHistoryAllowed()) {
    450     CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_CLEAR_ALL);
    451     // IsDeletingHistoryAllowed already checked for the existence of the
    452     // manager.
    453     main_notifier_.GetManager()->RemoveAllDownloads();
    454 
    455     // If this is an incognito downloads page, clear All should clear main
    456     // download manager as well.
    457     if (original_notifier_.get() && original_notifier_->GetManager())
    458       original_notifier_->GetManager()->RemoveAllDownloads();
    459   }
    460 
    461   // downloads.js always clears the display and relies on HandleClearAll to
    462   // ScheduleSendCurrentDownloads(). If any downloads are removed, then
    463   // OnDownloadRemoved() will call it, but if no downloads are actually removed,
    464   // then HandleClearAll needs to call it manually.
    465   ScheduleSendCurrentDownloads();
    466 }
    467 
    468 void DownloadsDOMHandler::HandleOpenDownloadsFolder(
    469     const base::ListValue* args) {
    470   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_OPEN_FOLDER);
    471   content::DownloadManager* manager = main_notifier_.GetManager();
    472   if (manager) {
    473     platform_util::OpenItem(
    474         Profile::FromBrowserContext(manager->GetBrowserContext()),
    475         DownloadPrefs::FromDownloadManager(manager)->DownloadPath());
    476   }
    477 }
    478 
    479 // DownloadsDOMHandler, private: ----------------------------------------------
    480 
    481 void DownloadsDOMHandler::ScheduleSendCurrentDownloads() {
    482   // Don't call SendCurrentDownloads() every time anything changes. Batch them
    483   // together instead. This may handle hundreds of OnDownloadDestroyed() calls
    484   // in a single UI message loop iteration when the user Clears All downloads.
    485   if (update_scheduled_)
    486     return;
    487   update_scheduled_ = true;
    488   BrowserThread::PostTask(
    489       BrowserThread::UI, FROM_HERE,
    490       base::Bind(&DownloadsDOMHandler::SendCurrentDownloads,
    491                  weak_ptr_factory_.GetWeakPtr()));
    492 }
    493 
    494 void DownloadsDOMHandler::SendCurrentDownloads() {
    495   update_scheduled_ = false;
    496   content::DownloadManager::DownloadVector all_items, filtered_items;
    497   if (main_notifier_.GetManager()) {
    498     main_notifier_.GetManager()->GetAllDownloads(&all_items);
    499     main_notifier_.GetManager()->CheckForHistoryFilesRemoval();
    500   }
    501   if (original_notifier_.get() && original_notifier_->GetManager()) {
    502     original_notifier_->GetManager()->GetAllDownloads(&all_items);
    503     original_notifier_->GetManager()->CheckForHistoryFilesRemoval();
    504   }
    505   DownloadQuery query;
    506   if (search_terms_ && !search_terms_->empty()) {
    507     query.AddFilter(DownloadQuery::FILTER_QUERY, *search_terms_.get());
    508   }
    509   query.AddFilter(base::Bind(&IsDownloadDisplayable));
    510   query.AddSorter(DownloadQuery::SORT_START_TIME, DownloadQuery::DESCENDING);
    511   query.Limit(kMaxDownloads);
    512   query.Search(all_items.begin(), all_items.end(), &filtered_items);
    513   base::ListValue results_value;
    514   for (content::DownloadManager::DownloadVector::const_iterator
    515        iter = filtered_items.begin(); iter != filtered_items.end(); ++iter) {
    516     results_value.Append(CreateDownloadItemValue(
    517         *iter,
    518         (original_notifier_.get() &&
    519           main_notifier_.GetManager() &&
    520           (main_notifier_.GetManager()->GetDownload((*iter)->GetId()) ==
    521           *iter))));
    522   }
    523   CallDownloadsList(results_value);
    524 }
    525 
    526 void DownloadsDOMHandler::ShowDangerPrompt(
    527     content::DownloadItem* dangerous_item) {
    528   DownloadDangerPrompt* danger_prompt = DownloadDangerPrompt::Create(
    529       dangerous_item,
    530       GetWebUIWebContents(),
    531       false,
    532       base::Bind(&DownloadsDOMHandler::DangerPromptDone,
    533                  weak_ptr_factory_.GetWeakPtr(), dangerous_item->GetId()));
    534   // danger_prompt will delete itself.
    535   DCHECK(danger_prompt);
    536 }
    537 
    538 void DownloadsDOMHandler::DangerPromptDone(
    539     int download_id, DownloadDangerPrompt::Action action) {
    540   if (action != DownloadDangerPrompt::ACCEPT)
    541     return;
    542   content::DownloadItem* item = NULL;
    543   if (main_notifier_.GetManager())
    544     item = main_notifier_.GetManager()->GetDownload(download_id);
    545   if (!item && original_notifier_.get() && original_notifier_->GetManager())
    546     item = original_notifier_->GetManager()->GetDownload(download_id);
    547   if (!item || item->IsDone())
    548     return;
    549   CountDownloadsDOMEvents(DOWNLOADS_DOM_EVENT_SAVE_DANGEROUS);
    550   item->ValidateDangerousDownload();
    551 }
    552 
    553 bool DownloadsDOMHandler::IsDeletingHistoryAllowed() {
    554   content::DownloadManager* manager = main_notifier_.GetManager();
    555   return (manager &&
    556           Profile::FromBrowserContext(manager->GetBrowserContext())->
    557               GetPrefs()->GetBoolean(prefs::kAllowDeletingBrowserHistory));
    558 }
    559 
    560 content::DownloadItem* DownloadsDOMHandler::GetDownloadByValue(
    561     const base::ListValue* args) {
    562   int download_id = -1;
    563   if (!ExtractIntegerValue(args, &download_id))
    564     return NULL;
    565   content::DownloadItem* item = NULL;
    566   if (main_notifier_.GetManager())
    567     item = main_notifier_.GetManager()->GetDownload(download_id);
    568   if (!item && original_notifier_.get() && original_notifier_->GetManager())
    569     item = original_notifier_->GetManager()->GetDownload(download_id);
    570   return item;
    571 }
    572 
    573 content::WebContents* DownloadsDOMHandler::GetWebUIWebContents() {
    574   return web_ui()->GetWebContents();
    575 }
    576 
    577 void DownloadsDOMHandler::CallDownloadsList(const base::ListValue& downloads) {
    578   web_ui()->CallJavascriptFunction("downloadsList", downloads);
    579 }
    580 
    581 void DownloadsDOMHandler::CallDownloadUpdated(
    582     const base::ListValue& download_item) {
    583   web_ui()->CallJavascriptFunction("downloadUpdated", download_item);
    584 }
    585