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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 "chrome/browser/lifetime/application_lifetime.h"
     23 #include "chrome/browser/ui/host_desktop.h"
     24 #include "content/public/browser/browser_thread.h"
     25 #include "ui/base/win/shell.h"
     26 #include "ui/gfx/native_widget_types.h"
     27 #include "url/gurl.h"
     28 
     29 using content::BrowserThread;
     30 
     31 namespace {
     32 
     33 void ShowItemInFolderOnFileThread(const base::FilePath& full_path) {
     34   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
     35   base::FilePath dir = full_path.DirName().AsEndingWithSeparator();
     36   // ParseDisplayName will fail if the directory is "C:", it must be "C:\\".
     37   if (dir.empty())
     38     return;
     39 
     40   typedef HRESULT (WINAPI *SHOpenFolderAndSelectItemsFuncPtr)(
     41       PCIDLIST_ABSOLUTE pidl_Folder,
     42       UINT cidl,
     43       PCUITEMID_CHILD_ARRAY pidls,
     44       DWORD flags);
     45 
     46   static SHOpenFolderAndSelectItemsFuncPtr open_folder_and_select_itemsPtr =
     47     NULL;
     48   static bool initialize_open_folder_proc = true;
     49   if (initialize_open_folder_proc) {
     50     initialize_open_folder_proc = false;
     51     // The SHOpenFolderAndSelectItems API is exposed by shell32 version 6
     52     // and does not exist in Win2K. We attempt to retrieve this function export
     53     // from shell32 and if it does not exist, we just invoke ShellExecute to
     54     // open the folder thus losing the functionality to select the item in
     55     // the process.
     56     HMODULE shell32_base = GetModuleHandle(L"shell32.dll");
     57     if (!shell32_base) {
     58       NOTREACHED() << " " << __FUNCTION__ << "(): Can't open shell32.dll";
     59       return;
     60     }
     61     open_folder_and_select_itemsPtr =
     62         reinterpret_cast<SHOpenFolderAndSelectItemsFuncPtr>
     63             (GetProcAddress(shell32_base, "SHOpenFolderAndSelectItems"));
     64   }
     65   if (!open_folder_and_select_itemsPtr) {
     66     ShellExecute(NULL, L"open", dir.value().c_str(), NULL, NULL, SW_SHOW);
     67     return;
     68   }
     69 
     70   base::win::ScopedComPtr<IShellFolder> desktop;
     71   HRESULT hr = SHGetDesktopFolder(desktop.Receive());
     72   if (FAILED(hr))
     73     return;
     74 
     75   base::win::ScopedCoMem<ITEMIDLIST> dir_item;
     76   hr = desktop->ParseDisplayName(NULL, NULL,
     77                                  const_cast<wchar_t *>(dir.value().c_str()),
     78                                  NULL, &dir_item, NULL);
     79   if (FAILED(hr))
     80     return;
     81 
     82   base::win::ScopedCoMem<ITEMIDLIST> file_item;
     83   hr = desktop->ParseDisplayName(NULL, NULL,
     84       const_cast<wchar_t *>(full_path.value().c_str()),
     85       NULL, &file_item, NULL);
     86   if (FAILED(hr))
     87     return;
     88 
     89   const ITEMIDLIST* highlight[] = { file_item };
     90 
     91   hr = (*open_folder_and_select_itemsPtr)(dir_item, arraysize(highlight),
     92                                           highlight, NULL);
     93 
     94   if (FAILED(hr)) {
     95     // On some systems, the above call mysteriously fails with "file not
     96     // found" even though the file is there.  In these cases, ShellExecute()
     97     // seems to work as a fallback (although it won't select the file).
     98     if (hr == ERROR_FILE_NOT_FOUND) {
     99       ShellExecute(NULL, L"open", dir.value().c_str(), NULL, NULL, SW_SHOW);
    100     } else {
    101       LPTSTR message = NULL;
    102       DWORD message_length = FormatMessage(
    103           FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
    104           0, hr, 0, reinterpret_cast<LPTSTR>(&message), 0, NULL);
    105       LOG(WARNING) << " " << __FUNCTION__
    106                    << "(): Can't open full_path = \""
    107                    << full_path.value() << "\""
    108                    << " hr = " << hr
    109                    << " " << reinterpret_cast<LPTSTR>(&message);
    110       if (message)
    111         LocalFree(message);
    112     }
    113   }
    114 }
    115 
    116 // Old ShellExecute crashes the process when the command for a given scheme
    117 // is empty. This function tells if it is.
    118 bool ValidateShellCommandForScheme(const std::string& scheme) {
    119   base::win::RegKey key;
    120   std::wstring registry_path = ASCIIToWide(scheme) +
    121                                L"\\shell\\open\\command";
    122   key.Open(HKEY_CLASSES_ROOT, registry_path.c_str(), KEY_READ);
    123   if (!key.Valid())
    124     return false;
    125   DWORD size = 0;
    126   key.ReadValue(NULL, NULL, &size, NULL);
    127   if (size <= 2)
    128     return false;
    129   return true;
    130 }
    131 
    132 void OpenExternalOnFileThread(const GURL& url) {
    133   // Quote the input scheme to be sure that the command does not have
    134   // parameters unexpected by the external program. This url should already
    135   // have been escaped.
    136   std::string escaped_url = url.spec();
    137   escaped_url.insert(0, "\"");
    138   escaped_url += "\"";
    139 
    140   // According to Mozilla in uriloader/exthandler/win/nsOSHelperAppService.cpp:
    141   // "Some versions of windows (Win2k before SP3, Win XP before SP1) crash in
    142   // ShellExecute on long URLs (bug 161357 on bugzilla.mozilla.org). IE 5 and 6
    143   // support URLS of 2083 chars in length, 2K is safe."
    144   const size_t kMaxUrlLength = 2048;
    145   if (escaped_url.length() > kMaxUrlLength) {
    146     NOTREACHED();
    147     return;
    148   }
    149 
    150   if (base::win::GetVersion() < base::win::VERSION_WIN7) {
    151     if (!ValidateShellCommandForScheme(url.scheme()))
    152       return;
    153   }
    154 
    155   if (reinterpret_cast<ULONG_PTR>(ShellExecuteA(NULL, "open",
    156                                                 escaped_url.c_str(), NULL, NULL,
    157                                                 SW_SHOWNORMAL)) <= 32) {
    158     // We fail to execute the call. We could display a message to the user.
    159     // TODO(nsylvain): we should also add a dialog to warn on errors. See
    160     // bug 1136923.
    161     return;
    162   }
    163 }
    164 
    165 }  // namespace
    166 
    167 namespace platform_util {
    168 
    169 void ShowItemInFolder(Profile* profile, const base::FilePath& full_path) {
    170   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    171 
    172   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH)
    173     chrome::ActivateDesktopHelper(chrome::ASH_KEEP_RUNNING);
    174 
    175   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
    176       base::Bind(&ShowItemInFolderOnFileThread, full_path));
    177 }
    178 
    179 void OpenItem(Profile* profile, const base::FilePath& full_path) {
    180   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    181 
    182   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH)
    183     chrome::ActivateDesktopHelper(chrome::ASH_KEEP_RUNNING);
    184 
    185   BrowserThread::PostTask(
    186       BrowserThread::FILE, FROM_HERE,
    187       base::Bind(base::IgnoreResult(&ui::win::OpenItemViaShell), full_path));
    188 }
    189 
    190 void OpenExternal(Profile* profile, const GURL& url) {
    191   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    192 
    193   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH &&
    194       !url.SchemeIsHTTPOrHTTPS())
    195     chrome::ActivateDesktopHelper(chrome::ASH_KEEP_RUNNING);
    196 
    197   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
    198                           base::Bind(&OpenExternalOnFileThread, url));
    199 }
    200 
    201 #if !defined(USE_AURA)
    202 gfx::NativeWindow GetTopLevel(gfx::NativeView view) {
    203   return ::GetAncestor(view, GA_ROOT);
    204 }
    205 
    206 gfx::NativeView GetParent(gfx::NativeView view) {
    207   return ::GetParent(view);
    208 }
    209 
    210 bool IsWindowActive(gfx::NativeWindow window) {
    211   return ::GetForegroundWindow() == window;
    212 }
    213 
    214 void ActivateWindow(gfx::NativeWindow window) {
    215   ::SetForegroundWindow(window);
    216 }
    217 
    218 bool IsVisible(gfx::NativeView view) {
    219   // MSVC complains if we don't include != 0.
    220   return ::IsWindowVisible(view) != 0;
    221 }
    222 #endif
    223 
    224 }  // namespace platform_util
    225