browser-scheme.cpp

/******************************************************************************
 Copyright (C) 2014 by John R. Bradley <jrb@turrettech.com>
 Copyright (C) 2023 by Lain Bailey <lain@obsproject.com>

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/

#include "browser-scheme.hpp"
#include "ip-string.hpp"
#include "wide-string.hpp"
#include <include/wrapper/cef_stream_resource_handler.h>

CefRefPtr<CefResourceHandler> BrowserSchemeHandlerFactory::Create(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame>,
								  const CefString &, CefRefPtr<CefRequest> request)
{
	if (!browser || !request)
		return nullptr;

	CefURLParts parts;
	CefParseURL(request->GetURL(), parts);

	std::string path = CefString(&parts.path);

	path = CefURIDecode(path, true, cef_uri_unescape_rule_t::UU_SPACES);
	path = CefURIDecode(path, true, cef_uri_unescape_rule_t::UU_URL_SPECIAL_CHARS_EXCEPT_PATH_SEPARATORS);

	std::string fileExtension = path.substr(path.find_last_of(".") + 1);

	for (char &ch : fileExtension)
		ch = (char)tolower(ch);
	if (fileExtension.compare("woff2") == 0)
		fileExtension = "woff";

	std::string filePath = path.substr(1);

	std::string checkString = path.substr(path.find_first_not_of("/"));
	checkString = checkString.substr(0, checkString.find_first_of("/"));

	// An IP address should never be a valid path for CreateForFile normally, but in some cases an OS
	// can resolve one as such. As an extra safeguard, we prevent any IP addresses in the path.
	if (checkForIpv4String(checkString)) {
		return nullptr;
	}

	if (checkForIpv6String(checkString)) {
		return nullptr;
	}

	CefRefPtr<CefStreamReader> stream = CefStreamReader::CreateForFile(filePath);
	if (!stream) {
		return nullptr;
	}

	CefString mimeType = CefGetMimeType(fileExtension);
	if (mimeType.empty()) {
		mimeType = "application/octet-stream";
	}

	return new CefStreamResourceHandler(mimeType, stream);
}