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// Copyright (c) 2011 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/platform_util.h"
#include <commdlg.h>
#include <dwmapi.h>
#include <shellapi.h>
#include <shlobj.h>
#include <stddef.h>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/registry.h"
#include "base/win/scoped_co_mem.h"
#include "base/win/scoped_comptr.h"
#include "base/win/windows_version.h"
#include "chrome/browser/lifetime/application_lifetime.h"
#include "chrome/browser/platform_util_internal.h"
#include "content/public/browser/browser_thread.h"
#include "ui/base/win/shell.h"
#include "ui/gfx/native_widget_types.h"
#include "url/gurl.h"
using content::BrowserThread;
namespace platform_util {
namespace {
void ShowItemInFolderOnFileThread(const base::FilePath& full_path) {
DCHECK_CURRENTLY_ON(BrowserThread::FILE);
base::FilePath dir = full_path.DirName().AsEndingWithSeparator();
// ParseDisplayName will fail if the directory is "C:", it must be "C:\\".
if (dir.empty())
return;
typedef HRESULT (WINAPI *SHOpenFolderAndSelectItemsFuncPtr)(
PCIDLIST_ABSOLUTE pidl_Folder,
UINT cidl,
PCUITEMID_CHILD_ARRAY pidls,
DWORD flags);
static SHOpenFolderAndSelectItemsFuncPtr open_folder_and_select_itemsPtr =
nullptr;
static bool initialize_open_folder_proc = true;
if (initialize_open_folder_proc) {
initialize_open_folder_proc = false;
// The SHOpenFolderAndSelectItems API is exposed by shell32 version 6
// and does not exist in Win2K. We attempt to retrieve this function export
// from shell32 and if it does not exist, we just invoke ShellExecute to
// open the folder thus losing the functionality to select the item in
// the process.
HMODULE shell32_base = GetModuleHandle(L"shell32.dll");
if (!shell32_base) {
NOTREACHED() << " " << __func__ << "(): Can't open shell32.dll";
return;
}
open_folder_and_select_itemsPtr =
reinterpret_cast<SHOpenFolderAndSelectItemsFuncPtr>
(GetProcAddress(shell32_base, "SHOpenFolderAndSelectItems"));
}
if (!open_folder_and_select_itemsPtr) {
ShellExecute(NULL, L"open", dir.value().c_str(), NULL, NULL, SW_SHOW);
return;
}
base::win::ScopedComPtr<IShellFolder> desktop;
HRESULT hr = SHGetDesktopFolder(desktop.Receive());
if (FAILED(hr))
return;
base::win::ScopedCoMem<ITEMIDLIST> dir_item;
hr = desktop->ParseDisplayName(NULL, NULL,
const_cast<wchar_t *>(dir.value().c_str()),
NULL, &dir_item, NULL);
if (FAILED(hr))
return;
base::win::ScopedCoMem<ITEMIDLIST> file_item;
hr = desktop->ParseDisplayName(NULL, NULL,
const_cast<wchar_t *>(full_path.value().c_str()),
NULL, &file_item, NULL);
if (FAILED(hr))
return;
const ITEMIDLIST* highlight[] = { file_item };
hr = (*open_folder_and_select_itemsPtr)(dir_item, arraysize(highlight),
highlight, NULL);
if (FAILED(hr)) {
// On some systems, the above call mysteriously fails with "file not
// found" even though the file is there. In these cases, ShellExecute()
// seems to work as a fallback (although it won't select the file).
if (hr == ERROR_FILE_NOT_FOUND) {
ShellExecute(NULL, L"open", dir.value().c_str(), NULL, NULL, SW_SHOW);
} else {
LOG(WARNING) << " " << __func__ << "(): Can't open full_path = \""
<< full_path.value() << "\""
<< " hr = " << logging::SystemErrorCodeToString(hr);
}
}
}
// Old ShellExecute crashes the process when the command for a given scheme
// is empty. This function tells if it is.
bool ValidateShellCommandForScheme(const std::string& scheme) {
base::win::RegKey key;
base::string16 registry_path = base::ASCIIToUTF16(scheme) +
L"\\shell\\open\\command";
key.Open(HKEY_CLASSES_ROOT, registry_path.c_str(), KEY_READ);
if (!key.Valid())
return false;
DWORD size = 0;
key.ReadValue(NULL, NULL, &size, NULL);
if (size <= 2)
return false;
return true;
}
void OpenExternalOnFileThread(const GURL& url) {
// Quote the input scheme to be sure that the command does not have
// parameters unexpected by the external program. This url should already
// have been escaped.
std::string escaped_url = url.spec();
escaped_url.insert(0, "\"");
escaped_url += "\"";
// According to Mozilla in uriloader/exthandler/win/nsOSHelperAppService.cpp:
// "Some versions of windows (Win2k before SP3, Win XP before SP1) crash in
// ShellExecute on long URLs (bug 161357 on bugzilla.mozilla.org). IE 5 and 6
// support URLS of 2083 chars in length, 2K is safe."
const size_t kMaxUrlLength = 2048;
if (escaped_url.length() > kMaxUrlLength) {
NOTREACHED();
return;
}
if (base::win::GetVersion() < base::win::VERSION_WIN7) {
if (!ValidateShellCommandForScheme(url.scheme()))
return;
}
if (reinterpret_cast<ULONG_PTR>(ShellExecuteA(NULL, "open",
escaped_url.c_str(), NULL, NULL,
SW_SHOWNORMAL)) <= 32) {
// We fail to execute the call. We could display a message to the user.
// TODO(nsylvain): we should also add a dialog to warn on errors. See
// bug 1136923.
return;
}
}
} // namespace
void ShowItemInFolder(Profile* profile, const base::FilePath& full_path) {
BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
base::Bind(&ShowItemInFolderOnFileThread, full_path));
}
namespace internal {
void PlatformOpenVerifiedItem(const base::FilePath& path, OpenItemType type) {
switch (type) {
case OPEN_FILE:
ui::win::OpenFileViaShell(path);
break;
case OPEN_FOLDER:
ui::win::OpenFolderViaShell(path);
break;
}
}
} // namespace internal
void OpenExternal(Profile* profile, const GURL& url) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
base::Bind(&OpenExternalOnFileThread, url));
}
} // namespace platform_util
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