cef/libcef/external_protocol_handler_w...

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// Copyright (c) 2011 The Chromium Embedded Framework 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 "libcef/external_protocol_handler.h"
#include <windows.h>
#include <shellapi.h>
#include "base/utf_string_conversions.h"
#include "base/win/registry.h"
#include "googleurl/src/gurl.h"
namespace ExternalProtocolHandler {
// 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 int kMaxAddressLengthChars = 2048;
bool HasExternalHandler(const std::string& scheme) {
base::win::RegKey key;
const std::wstring registry_path =
ASCIIToWide(scheme + "\\shell\\open\\command");
key.Open(HKEY_CLASSES_ROOT, registry_path.c_str(), KEY_READ);
if (key.Valid()) {
DWORD size = 0;
key.ReadValue(NULL, NULL, &size, NULL);
if (size > 2) {
// ShellExecute crashes the process when the command is empty.
// We check for "2" because it always returns the trailing NULL.
return true;
}
}
return false;
}
bool HandleExternalProtocol(const GURL& gurl) {
if (!HasExternalHandler(gurl.scheme()))
return false;
const std::string& address = gurl.spec();
if (address.length() > kMaxAddressLengthChars)
return false;
ShellExecuteA(NULL, "open", address.c_str(), NULL, NULL, SW_SHOWNORMAL);
return true;
}
} // namespace ExternalProtocolHandler