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      1 // Copyright (c) 2011 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/platform_util.h"
      6 
      7 #include <commdlg.h>
      8 #include <dwmapi.h>
      9 #include <shellapi.h>
     10 #include <shlobj.h>
     11 
     12 #include "base/bind.h"
     13 #include "base/bind_helpers.h"
     14 #include "base/files/file_path.h"
     15 #include "base/logging.h"
     16 #include "base/strings/string_util.h"
     17 #include "base/strings/utf_string_conversions.h"
     18 #include "base/win/registry.h"
     19 #include "base/win/scoped_co_mem.h"
     20 #include "base/win/scoped_comptr.h"
     21 #include "base/win/windows_version.h"
     22 #include "content/public/browser/browser_thread.h"
     23 #include "ui/base/win/shell.h"
     24 #include "ui/gfx/native_widget_types.h"
     25 #include "url/gurl.h"
     26 
     27 using content::BrowserThread;
     28 
     29 namespace {
     30 
     31 void ShowItemInFolderOnFileThread(const base::FilePath& full_path) {
     32   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
     33   base::FilePath dir = full_path.DirName().AsEndingWithSeparator();
     34   // ParseDisplayName will fail if the directory is "C:", it must be "C:\\".
     35   if (dir.empty())
     36     return;
     37 
     38   typedef HRESULT (WINAPI *SHOpenFolderAndSelectItemsFuncPtr)(
     39       PCIDLIST_ABSOLUTE pidl_Folder,
     40       UINT cidl,
     41       PCUITEMID_CHILD_ARRAY pidls,
     42       DWORD flags);
     43 
     44   static SHOpenFolderAndSelectItemsFuncPtr open_folder_and_select_itemsPtr =
     45     NULL;
     46   static bool initialize_open_folder_proc = true;
     47   if (initialize_open_folder_proc) {
     48     initialize_open_folder_proc = false;
     49     // The SHOpenFolderAndSelectItems API is exposed by shell32 version 6
     50     // and does not exist in Win2K. We attempt to retrieve this function export
     51     // from shell32 and if it does not exist, we just invoke ShellExecute to
     52     // open the folder thus losing the functionality to select the item in
     53     // the process.
     54     HMODULE shell32_base = GetModuleHandle(L"shell32.dll");
     55     if (!shell32_base) {
     56       NOTREACHED() << " " << __FUNCTION__ << "(): Can't open shell32.dll";
     57       return;
     58     }
     59     open_folder_and_select_itemsPtr =
     60         reinterpret_cast<SHOpenFolderAndSelectItemsFuncPtr>
     61             (GetProcAddress(shell32_base, "SHOpenFolderAndSelectItems"));
     62   }
     63   if (!open_folder_and_select_itemsPtr) {
     64     ShellExecute(NULL, L"open", dir.value().c_str(), NULL, NULL, SW_SHOW);
     65     return;
     66   }
     67 
     68   base::win::ScopedComPtr<IShellFolder> desktop;
     69   HRESULT hr = SHGetDesktopFolder(desktop.Receive());
     70   if (FAILED(hr))
     71     return;
     72 
     73   base::win::ScopedCoMem<ITEMIDLIST> dir_item;
     74   hr = desktop->ParseDisplayName(NULL, NULL,
     75                                  const_cast<wchar_t *>(dir.value().c_str()),
     76                                  NULL, &dir_item, NULL);
     77   if (FAILED(hr))
     78     return;
     79 
     80   base::win::ScopedCoMem<ITEMIDLIST> file_item;
     81   hr = desktop->ParseDisplayName(NULL, NULL,
     82       const_cast<wchar_t *>(full_path.value().c_str()),
     83       NULL, &file_item, NULL);
     84   if (FAILED(hr))
     85     return;
     86 
     87   const ITEMIDLIST* highlight[] = { file_item };
     88 
     89   hr = (*open_folder_and_select_itemsPtr)(dir_item, arraysize(highlight),
     90                                           highlight, NULL);
     91 
     92   if (FAILED(hr)) {
     93     // On some systems, the above call mysteriously fails with "file not
     94     // found" even though the file is there.  In these cases, ShellExecute()
     95     // seems to work as a fallback (although it won't select the file).
     96     if (hr == ERROR_FILE_NOT_FOUND) {
     97       ShellExecute(NULL, L"open", dir.value().c_str(), NULL, NULL, SW_SHOW);
     98     } else {
     99       LPTSTR message = NULL;
    100       DWORD message_length = FormatMessage(
    101           FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
    102           0, hr, 0, reinterpret_cast<LPTSTR>(&message), 0, NULL);
    103       LOG(WARNING) << " " << __FUNCTION__
    104                    << "(): Can't open full_path = \""
    105                    << full_path.value() << "\""
    106                    << " hr = " << hr
    107                    << " " << reinterpret_cast<LPTSTR>(&message);
    108       if (message)
    109         LocalFree(message);
    110     }
    111   }
    112 }
    113 
    114 // Old ShellExecute crashes the process when the command for a given scheme
    115 // is empty. This function tells if it is.
    116 bool ValidateShellCommandForScheme(const std::string& scheme) {
    117   base::win::RegKey key;
    118   std::wstring registry_path = ASCIIToWide(scheme) +
    119                                L"\\shell\\open\\command";
    120   key.Open(HKEY_CLASSES_ROOT, registry_path.c_str(), KEY_READ);
    121   if (!key.Valid())
    122     return false;
    123   DWORD size = 0;
    124   key.ReadValue(NULL, NULL, &size, NULL);
    125   if (size <= 2)
    126     return false;
    127   return true;
    128 }
    129 
    130 }  // namespace
    131 
    132 namespace platform_util {
    133 
    134 void ShowItemInFolder(const base::FilePath& full_path) {
    135   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    136   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
    137       base::Bind(&ShowItemInFolderOnFileThread, full_path));
    138 }
    139 
    140 void OpenItem(const base::FilePath& full_path) {
    141   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    142   BrowserThread::PostTask(
    143       BrowserThread::FILE, FROM_HERE,
    144       base::Bind(base::IgnoreResult(&ui::win::OpenItemViaShell), full_path));
    145 }
    146 
    147 void OpenExternal(const GURL& url) {
    148   // Quote the input scheme to be sure that the command does not have
    149   // parameters unexpected by the external program. This url should already
    150   // have been escaped.
    151   std::string escaped_url = url.spec();
    152   escaped_url.insert(0, "\"");
    153   escaped_url += "\"";
    154 
    155   // According to Mozilla in uriloader/exthandler/win/nsOSHelperAppService.cpp:
    156   // "Some versions of windows (Win2k before SP3, Win XP before SP1) crash in
    157   // ShellExecute on long URLs (bug 161357 on bugzilla.mozilla.org). IE 5 and 6
    158   // support URLS of 2083 chars in length, 2K is safe."
    159   const size_t kMaxUrlLength = 2048;
    160   if (escaped_url.length() > kMaxUrlLength) {
    161     NOTREACHED();
    162     return;
    163   }
    164 
    165   if (base::win::GetVersion() < base::win::VERSION_WIN7) {
    166     if (!ValidateShellCommandForScheme(url.scheme()))
    167       return;
    168   }
    169 
    170   if (reinterpret_cast<ULONG_PTR>(ShellExecuteA(NULL, "open",
    171                                                 escaped_url.c_str(), NULL, NULL,
    172                                                 SW_SHOWNORMAL)) <= 32) {
    173     // We fail to execute the call. We could display a message to the user.
    174     // TODO(nsylvain): we should also add a dialog to warn on errors. See
    175     // bug 1136923.
    176     return;
    177   }
    178 }
    179 
    180 #if !defined(USE_AURA)
    181 gfx::NativeWindow GetTopLevel(gfx::NativeView view) {
    182   return ::GetAncestor(view, GA_ROOT);
    183 }
    184 
    185 gfx::NativeView GetParent(gfx::NativeView view) {
    186   return ::GetParent(view);
    187 }
    188 
    189 bool IsWindowActive(gfx::NativeWindow window) {
    190   return ::GetForegroundWindow() == window;
    191 }
    192 
    193 void ActivateWindow(gfx::NativeWindow window) {
    194   ::SetForegroundWindow(window);
    195 }
    196 
    197 bool IsVisible(gfx::NativeView view) {
    198   // MSVC complains if we don't include != 0.
    199   return ::IsWindowVisible(view) != 0;
    200 }
    201 #endif
    202 
    203 }  // namespace platform_util
    204