Prefer opening PDF downloads in the browser.

chrome/browser/download/chrome_download_manager_delegate.cc

 // 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 "chrome/browser/download/chrome_download_manager_delegate.h"
 
 #include <string>
 
+#include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/prefs/pref_member.h"
 #include "base/prefs/pref_service.h"
 #include "base/rand_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/download/download_completion_blocker.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_file_picker.h"
 #include "chrome/browser/download/download_history.h"
+#include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_path_reservation_tracker.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/download/download_service_factory.h"
 #include "chrome/browser/download/download_target_determiner.h"
 #include "chrome/browser/download/save_package_file_picker.h"
 #include "chrome/browser/extensions/api/downloads/downloads_api.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/scoped_tabbed_browser_displayer.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/pref_names.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_manager.h"
 #include "content/public/browser/notification_source.h"
+#include "content/public/browser/page_navigator.h"
 #include "extensions/common/constants.h"
+#include "net/base/mime_util.h"
+#include "net/base/net_util.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/drive/download_handler.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #endif
 
 using content::BrowserThread;
 using content::DownloadItem;
 using content::DownloadManager;
 using safe_browsing::DownloadProtectionService;
@@ skipping 101 matching lines @@
   } else {
     // If the URL is malicious, we'll use that as the danger type. The results
     // of the content check, if one is performed, will be ignored.
     danger_type = content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL;
   }
   callback.Run(danger_type);
 }
 
 #endif  // FULL_SAFE_BROWSING
 
+// Called on the blocking pool to determine the MIME type for |path|.
+void GetMimeTypeAndReplyOnUIThread(
+    const base::FilePath& path,
+    const base::Callback<void(const std::string&)>& callback) {
+  std::string mime_type;
+  net::GetMimeTypeFromFile(path, &mime_type);
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE, base::Bind(callback, mime_type));
+}
+
+bool IsOpenInBrowserPreferreredForFile(const base::FilePath& path,
+                                       const std::string& mime_type) {
+  // On Android, always prefer opening with an external app.
+#if !defined(OS_ANDROID)
+  if (net::IsSupportedImageMimeType(mime_type))
+    return true;
+
+#if defined(ENABLE_PLUGINS)
+  if (path.MatchesExtension(FILE_PATH_LITERAL(".pdf")))
+    return true;
+#endif // ENABLE_PLUGINS
+#endif // !OS_ANDROID
+  return false;
+}
+
 }  // namespace
 
 ChromeDownloadManagerDelegate::ChromeDownloadManagerDelegate(Profile* profile)
     : profile_(profile),
       next_download_id_(content::DownloadItem::kInvalidId),
       download_prefs_(new DownloadPrefs(profile)) {
 }
 
 ChromeDownloadManagerDelegate::~ChromeDownloadManagerDelegate() {
 }
@@ skipping 39 matching lines @@
     const content::DownloadIdCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!profile_->IsOffTheRecord());
   DCHECK_NE(content::DownloadItem::kInvalidId, next_download_id_);
   callback.Run(next_download_id_++);
 }
 
 bool ChromeDownloadManagerDelegate::DetermineDownloadTarget(
     DownloadItem* download,
     const content::DownloadTargetCallback& callback) {
+  DownloadTargetDeterminer::CompletionCallback target_determined_callback =
+      base::Bind(&ChromeDownloadManagerDelegate::OnDownloadTargetDetermined,
+                 this,
+                 download->GetId(),
+                 callback);
   DownloadTargetDeterminer::Start(
       download,
-      GetPlatformDownloadPath(
-          profile_, download, PLATFORM_TARGET_PATH),
+      GetPlatformDownloadPath(profile_, download, PLATFORM_TARGET_PATH),
       download_prefs_.get(),
       this,
-      callback);
+      target_determined_callback);
   return true;
 }
 
 bool ChromeDownloadManagerDelegate::ShouldOpenFileBasedOnExtension(
     const base::FilePath& path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (path.Extension().empty())
     return false;
   // TODO(asanka): This determination is done based on |path|, while
   // ShouldOpenDownload() detects extension downloads based on the
@@ skipping 124 matching lines @@
   // Deletes itself.
   new SavePackageFilePicker(
       web_contents,
       suggested_path,
       default_extension,
       can_save_as_complete,
       download_prefs_.get(),
       callback);
 }
 
-void ChromeDownloadManagerDelegate::OpenDownload(DownloadItem* download) {
-  DCHECK_EQ(DownloadItem::COMPLETE, download->GetState());
-  if (!download->CanOpenDownload())
-    return;
+void ChromeDownloadManagerDelegate::OpenDownloadUsingPlatformHandler(
+    DownloadItem* download) {
   base::FilePath platform_path(
       GetPlatformDownloadPath(profile_, download, PLATFORM_TARGET_PATH));
   DCHECK(!platform_path.empty());
   platform_util::OpenItem(platform_path);
 }
 
+void ChromeDownloadManagerDelegate::OpenDownload(DownloadItem* download) {
+  DCHECK_EQ(DownloadItem::COMPLETE, download->GetState());
+  DCHECK(!download->GetTargetFilePath().empty());
+  if (!download->CanOpenDownload())
+    return;
+
+  if (!DownloadItemModel(download).ShouldPreferOpeningInBrowser()) {
+    OpenDownloadUsingPlatformHandler(download);
+    return;
+  }
+
+  content::WebContents* web_contents = download->GetWebContents();
+  Browser* browser =
+      web_contents ? chrome::FindBrowserWithWebContents(web_contents) : NULL;
+  scoped_ptr<chrome::ScopedTabbedBrowserDisplayer> browser_displayer;
+  if (!browser ||
+      !browser->CanSupportWindowFeature(Browser::FEATURE_TABSTRIP)) {
+    browser_displayer.reset(new chrome::ScopedTabbedBrowserDisplayer(
+        profile_, chrome::GetActiveDesktop()));
+    browser = browser_displayer->browser();
+  }
+  content::OpenURLParams params(
+      net::FilePathToFileURL(download->GetTargetFilePath()),
+      content::Referrer(),
+      NEW_FOREGROUND_TAB,
+      content::PAGE_TRANSITION_LINK,
+      false);
+  browser->OpenURL(params);
+}
+
 void ChromeDownloadManagerDelegate::ShowDownloadInShell(
     DownloadItem* download) {
   if (!download->CanShowInFolder())
     return;
   base::FilePath platform_path(
       GetPlatformDownloadPath(profile_, download, PLATFORM_CURRENT_PATH));
   DCHECK(!platform_path.empty());
   platform_util::ShowItemInFolder(platform_path);
 }
 
@@ skipping 122 matching lines @@
     service->CheckDownloadUrl(*download,
                               base::Bind(&CheckDownloadUrlDone,
                                          callback,
                                          is_content_check_supported));
     return;
   }
 #endif
   callback.Run(content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS);
 }
 
+void ChromeDownloadManagerDelegate::GetFileMimeType(
+    const base::FilePath& path,
+    const GetFileMimeTypeCallback& callback) {
+  BrowserThread::PostBlockingPoolTask(
+      FROM_HERE,
+      base::Bind(&GetMimeTypeAndReplyOnUIThread, path, callback));
+}
+
 #if defined(FULL_SAFE_BROWSING)
 void ChromeDownloadManagerDelegate::CheckClientDownloadDone(
     uint32 download_id,
     DownloadProtectionService::DownloadCheckResult result) {
   DownloadItem* item = download_manager_->GetDownload(download_id);
   if (!item || (item->GetState() != DownloadItem::IN_PROGRESS))
     return;
 
   VLOG(2) << __FUNCTION__ << "() download = " << item->DebugString(false)
           << " verdict = " << result;
@@ skipping 43 matching lines @@
                     chrome::NOTIFICATION_CRX_INSTALLER_DONE,
                     source);
 
   scoped_refptr<extensions::CrxInstaller> installer =
       content::Source<extensions::CrxInstaller>(source).ptr();
   content::DownloadOpenDelayedCallback callback =
       crx_installers_[installer.get()];
   crx_installers_.erase(installer.get());
   callback.Run(installer->did_handle_successfully());
 }
+
+void ChromeDownloadManagerDelegate::OnDownloadTargetDetermined(
+    int32 download_id,
+    const content::DownloadTargetCallback& callback,
+    scoped_ptr<DownloadTargetInfo> target_info) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DownloadItem* item = download_manager_->GetDownload(download_id);
+  if (!target_info->target_path.empty() && item &&
+      IsOpenInBrowserPreferreredForFile(target_info->target_path,
+                                        target_info->mime_type) &&
+      target_info->is_filetype_handled_securely)
+    DownloadItemModel(item).SetShouldPreferOpeningInBrowser(true);
+  callback.Run(target_info->target_path,
+               target_info->target_disposition,
+               target_info->danger_type,
+               target_info->intermediate_path);
+}