[MediaGalleries] Introduce an AV-checking base class for copy-move validation

chrome/browser/media_galleries/fileapi/av_scanning_file_validator.cc

+// Copyright 2013 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/media_galleries/fileapi/av_scanning_file_validator.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#include <shlobj.h>
+#endif
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/common/chrome_constants.h"
+#include "content/public/browser/browser_thread.h"
+
+#if defined(OS_WIN)
+#include "base/win/scoped_comptr.h"
+#endif
+
+using content::BrowserThread;
+
+namespace chrome {
+
+namespace {
+
+#if defined(OS_WIN)
+base::PlatformFileError ScanFile(
+    const base::FilePath& dest_platform_path) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+
+  base::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);
+    return base::PLATFORM_FILE_ERROR_SECURITY;
+  }
+
+  hr = attachment_services->SetLocalPath(dest_platform_path.value().c_str());
+  if (FAILED(hr))
+    return base::PLATFORM_FILE_ERROR_SECURITY;
+
+  // A failure in the Save() call below could result in the downloaded file
+  // being deleted.
+  HRESULT scan_result = attachment_services->Save();
+  if (scan_result == S_OK)
+    return base::PLATFORM_FILE_OK;
+
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+#endif
+
+}  // namespace
+
+AVScanningFileValidator::~AVScanningFileValidator() {}
+
+void AVScanningFileValidator::StartPostWriteValidation(
+    const base::FilePath& dest_platform_path,
+    const ResultCallback& result_callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+#if defined(OS_WIN)
+  BrowserThread::PostTaskAndReplyWithResult(
+      BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(&ScanFile, dest_platform_path),
+      result_callback);
+#else
+  result_callback.Run(base::PLATFORM_FILE_OK);
+#endif
+}
+
+AVScanningFileValidator::AVScanningFileValidator() {
+}
+
+}  // namespace chrome