[Downloads] Move client guid for AV scanning of downloaded files to chrome/

base/file_util_win.cc

Index: base/file_util_win.cc
diff --git a/base/file_util_win.cc b/base/file_util_win.cc
index 39317a3a932777a3a10f635ba9024f7a92a4746e..872fbeda21ea831dc572958fb06f539415f37c9f 100644
--- a/base/file_util_win.cc
+++ b/base/file_util_win.cc
@@ -24,6 +24,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
+#include "base/win/scoped_comptr.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/windows_version.h"
 
@@ -31,6 +32,12 @@ namespace base {
 
 namespace {
 
+// This GUID is associated with any 'don't ask me again' settings that the
+// user can select for different file types.
+// {2676A9A2-D919-4fee-9187-152100393AB2}
+const GUID kClientID = { 0x2676a9a2, 0xd919, 0x4fee,
+  { 0x91, 0x87, 0x15, 0x21, 0x0, 0x39, 0x3a, 0xb2 } };
+
 const DWORD kFileShareAll =
     FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
 
@@ -72,6 +79,36 @@ bool ShellCopy(const FilePath& from_path,
   return (SHFileOperation(&file_operation) == 0);
 }
 
+// Sets the Zone Identifier on the file to "Internet" (3). Returns true if the
+// function succeeds, false otherwise. A failure is expected on system where
+// the Zone Identifier is not supported, like a machine with a FAT32 filesystem.
+// This function does not invoke Windows Attachment Execution Services.
+//
+// |full_path| is the path to the downloaded file.
+bool SetInternetZoneIdentifierDirectly(const base::FilePath& full_path) {
+  const DWORD kShare = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
+  std::wstring path = full_path.value() + L":Zone.Identifier";
+  HANDLE file = CreateFile(path.c_str(), GENERIC_WRITE, kShare, NULL,
+                           OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+  if (INVALID_HANDLE_VALUE == file)
+    return false;
+
+  static const char kIdentifier[] = "[ZoneTransfer]\r\nZoneId=3\r\n";
+  // Don't include trailing null in data written.
+  static const DWORD kIdentifierSize = arraysize(kIdentifier) - 1;
+  DWORD written = 0;
+  BOOL result = WriteFile(file, kIdentifier, kIdentifierSize, &written, NULL);
+  BOOL flush_result = FlushFileBuffers(file);
+  CloseHandle(file);
+
+  if (!result || !flush_result || written != kIdentifierSize) {
+    NOTREACHED();
+    return false;
+  }
+
+  return true;
+}
+
 }  // namespace
 
 FilePath MakeAbsoluteFilePath(const FilePath& input) {
@@ -147,6 +184,40 @@ bool DeleteFileAfterReboot(const FilePath& path) {
                         MOVEFILE_REPLACE_EXISTING) != FALSE;
 }
 
+HRESULT AVScanFile(const FilePath& full_path, const std::string& source_url) {
+  win::ScopedComPtr<IAttachmentExecute> attachment_services;
+  HRESULT hr = attachment_services.CreateInstance(CLSID_AttachmentServices);
+
+  if (FAILED(hr)) {
+    // The thread must have COM initialized.
+    DCHECK_NE(CO_E_NOTINITIALIZED, hr);
+
+    // We don't have Attachment Execution Services, it must be a pre-XP.SP2
+    // Windows installation, or the thread does not have COM initialized. Try to
+    // set the zone information directly. Failure is not considered an error.
+    SetInternetZoneIdentifierDirectly(full_path);
+    return hr;
+  }
+
+  hr = attachment_services->SetClientGuid(kClientID);
+  if (FAILED(hr))
+    return hr;
+
+  hr = attachment_services->SetLocalPath(full_path.value().c_str());
+  if (FAILED(hr))
+    return hr;
+
+  if (!source_url.empty()) {
+    hr = attachment_services->SetSource(UTF8ToWide(source_url).c_str());
+    if (FAILED(hr))
+      return hr;
+  }
+
+  // A failure in the Save() call below could result in the downloaded file
+  // being deleted.
+  return attachment_services->Save();
+}
+
 bool ReplaceFile(const FilePath& from_path,
                  const FilePath& to_path,
                  PlatformFileError* error) {