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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/metrics/field_trial.h"
     17 #include "base/strings/string_util.h"
     18 #include "base/strings/utf_string_conversions.h"
     19 #include "base/win/registry.h"
     20 #include "base/win/scoped_co_mem.h"
     21 #include "base/win/scoped_comptr.h"
     22 #include "base/win/windows_version.h"
     23 #include "chrome/browser/lifetime/application_lifetime.h"
     24 #include "chrome/browser/ui/host_desktop.h"
     25 #include "chrome/common/chrome_utility_messages.h"
     26 #include "content/public/browser/browser_thread.h"
     27 #include "content/public/browser/utility_process_host.h"
     28 #include "content/public/browser/utility_process_host_client.h"
     29 #include "ui/base/win/shell.h"
     30 #include "ui/gfx/native_widget_types.h"
     31 #include "url/gurl.h"
     32 
     33 using content::BrowserThread;
     34 
     35 namespace {
     36 
     37 void ShowItemInFolderOnFileThread(const base::FilePath& full_path) {
     38   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
     39   base::FilePath dir = full_path.DirName().AsEndingWithSeparator();
     40   // ParseDisplayName will fail if the directory is "C:", it must be "C:\\".
     41   if (dir.empty())
     42     return;
     43 
     44   typedef HRESULT (WINAPI *SHOpenFolderAndSelectItemsFuncPtr)(
     45       PCIDLIST_ABSOLUTE pidl_Folder,
     46       UINT cidl,
     47       PCUITEMID_CHILD_ARRAY pidls,
     48       DWORD flags);
     49 
     50   static SHOpenFolderAndSelectItemsFuncPtr open_folder_and_select_itemsPtr =
     51     NULL;
     52   static bool initialize_open_folder_proc = true;
     53   if (initialize_open_folder_proc) {
     54     initialize_open_folder_proc = false;
     55     // The SHOpenFolderAndSelectItems API is exposed by shell32 version 6
     56     // and does not exist in Win2K. We attempt to retrieve this function export
     57     // from shell32 and if it does not exist, we just invoke ShellExecute to
     58     // open the folder thus losing the functionality to select the item in
     59     // the process.
     60     HMODULE shell32_base = GetModuleHandle(L"shell32.dll");
     61     if (!shell32_base) {
     62       NOTREACHED() << " " << __FUNCTION__ << "(): Can't open shell32.dll";
     63       return;
     64     }
     65     open_folder_and_select_itemsPtr =
     66         reinterpret_cast<SHOpenFolderAndSelectItemsFuncPtr>
     67             (GetProcAddress(shell32_base, "SHOpenFolderAndSelectItems"));
     68   }
     69   if (!open_folder_and_select_itemsPtr) {
     70     ShellExecute(NULL, L"open", dir.value().c_str(), NULL, NULL, SW_SHOW);
     71     return;
     72   }
     73 
     74   base::win::ScopedComPtr<IShellFolder> desktop;
     75   HRESULT hr = SHGetDesktopFolder(desktop.Receive());
     76   if (FAILED(hr))
     77     return;
     78 
     79   base::win::ScopedCoMem<ITEMIDLIST> dir_item;
     80   hr = desktop->ParseDisplayName(NULL, NULL,
     81                                  const_cast<wchar_t *>(dir.value().c_str()),
     82                                  NULL, &dir_item, NULL);
     83   if (FAILED(hr))
     84     return;
     85 
     86   base::win::ScopedCoMem<ITEMIDLIST> file_item;
     87   hr = desktop->ParseDisplayName(NULL, NULL,
     88       const_cast<wchar_t *>(full_path.value().c_str()),
     89       NULL, &file_item, NULL);
     90   if (FAILED(hr))
     91     return;
     92 
     93   const ITEMIDLIST* highlight[] = { file_item };
     94 
     95   hr = (*open_folder_and_select_itemsPtr)(dir_item, arraysize(highlight),
     96                                           highlight, NULL);
     97 
     98   if (FAILED(hr)) {
     99     // On some systems, the above call mysteriously fails with "file not
    100     // found" even though the file is there.  In these cases, ShellExecute()
    101     // seems to work as a fallback (although it won't select the file).
    102     if (hr == ERROR_FILE_NOT_FOUND) {
    103       ShellExecute(NULL, L"open", dir.value().c_str(), NULL, NULL, SW_SHOW);
    104     } else {
    105       LOG(WARNING) << " " << __FUNCTION__
    106                    << "(): Can't open full_path = \""
    107                    << full_path.value() << "\""
    108                   << " hr = " << logging::SystemErrorCodeToString(hr);
    109     }
    110   }
    111 }
    112 
    113 // Old ShellExecute crashes the process when the command for a given scheme
    114 // is empty. This function tells if it is.
    115 bool ValidateShellCommandForScheme(const std::string& scheme) {
    116   base::win::RegKey key;
    117   std::wstring registry_path = base::ASCIIToWide(scheme) +
    118                                L"\\shell\\open\\command";
    119   key.Open(HKEY_CLASSES_ROOT, registry_path.c_str(), KEY_READ);
    120   if (!key.Valid())
    121     return false;
    122   DWORD size = 0;
    123   key.ReadValue(NULL, NULL, &size, NULL);
    124   if (size <= 2)
    125     return false;
    126   return true;
    127 }
    128 
    129 void OpenExternalOnFileThread(const GURL& url) {
    130   // Quote the input scheme to be sure that the command does not have
    131   // parameters unexpected by the external program. This url should already
    132   // have been escaped.
    133   std::string escaped_url = url.spec();
    134   escaped_url.insert(0, "\"");
    135   escaped_url += "\"";
    136 
    137   // According to Mozilla in uriloader/exthandler/win/nsOSHelperAppService.cpp:
    138   // "Some versions of windows (Win2k before SP3, Win XP before SP1) crash in
    139   // ShellExecute on long URLs (bug 161357 on bugzilla.mozilla.org). IE 5 and 6
    140   // support URLS of 2083 chars in length, 2K is safe."
    141   const size_t kMaxUrlLength = 2048;
    142   if (escaped_url.length() > kMaxUrlLength) {
    143     NOTREACHED();
    144     return;
    145   }
    146 
    147   if (base::win::GetVersion() < base::win::VERSION_WIN7) {
    148     if (!ValidateShellCommandForScheme(url.scheme()))
    149       return;
    150   }
    151 
    152   if (reinterpret_cast<ULONG_PTR>(ShellExecuteA(NULL, "open",
    153                                                 escaped_url.c_str(), NULL, NULL,
    154                                                 SW_SHOWNORMAL)) <= 32) {
    155     // We fail to execute the call. We could display a message to the user.
    156     // TODO(nsylvain): we should also add a dialog to warn on errors. See
    157     // bug 1136923.
    158     return;
    159   }
    160 }
    161 
    162 void OpenItemViaShellInUtilityProcess(const base::FilePath& full_path) {
    163   base::WeakPtr<content::UtilityProcessHost> utility_process_host(
    164       content::UtilityProcessHost::Create(NULL, NULL)->AsWeakPtr());
    165   utility_process_host->DisableSandbox();
    166   utility_process_host->Send(new ChromeUtilityMsg_OpenItemViaShell(full_path));
    167 }
    168 
    169 }  // namespace
    170 
    171 namespace platform_util {
    172 
    173 void ShowItemInFolder(Profile* profile, const base::FilePath& full_path) {
    174   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    175 
    176   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH)
    177     chrome::ActivateDesktopHelper(chrome::ASH_KEEP_RUNNING);
    178 
    179   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
    180       base::Bind(&ShowItemInFolderOnFileThread, full_path));
    181 }
    182 
    183 void OpenItem(Profile* profile, const base::FilePath& full_path) {
    184   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    185 
    186   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH)
    187     chrome::ActivateDesktopHelper(chrome::ASH_KEEP_RUNNING);
    188 
    189   if (base::FieldTrialList::FindFullName("IsolateShellOperations") ==
    190       "Enabled") {
    191     BrowserThread::PostTask(
    192         BrowserThread::IO,
    193         FROM_HERE,
    194         base::Bind(&OpenItemViaShellInUtilityProcess, full_path));
    195   } else {
    196     BrowserThread::PostTask(
    197         BrowserThread::FILE,
    198         FROM_HERE,
    199         base::Bind(base::IgnoreResult(&ui::win::OpenItemViaShell), full_path));
    200   }
    201 }
    202 
    203 void OpenExternal(Profile* profile, const GURL& url) {
    204   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    205 
    206   if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH &&
    207       !url.SchemeIsHTTPOrHTTPS())
    208     chrome::ActivateDesktopHelper(chrome::ASH_KEEP_RUNNING);
    209 
    210   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
    211                           base::Bind(&OpenExternalOnFileThread, url));
    212 }
    213 
    214 #if !defined(USE_AURA)
    215 gfx::NativeWindow GetTopLevel(gfx::NativeView view) {
    216   return ::GetAncestor(view, GA_ROOT);
    217 }
    218 
    219 gfx::NativeView GetParent(gfx::NativeView view) {
    220   return ::GetParent(view);
    221 }
    222 
    223 bool IsWindowActive(gfx::NativeWindow window) {
    224   return ::GetForegroundWindow() == window;
    225 }
    226 
    227 void ActivateWindow(gfx::NativeWindow window) {
    228   ::SetForegroundWindow(window);
    229 }
    230 
    231 bool IsVisible(gfx::NativeView view) {
    232   // MSVC complains if we don't include != 0.
    233   return ::IsWindowVisible(view) != 0;
    234 }
    235 #endif
    236 
    237 }  // namespace platform_util
    238