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downloadfilehandler.cpp

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #include "backends/networking/sdl_net/handlers/downloadfilehandler.h"
00024 #include "backends/fs/fs-factory.h"
00025 #include "backends/networking/sdl_net/getclienthandler.h"
00026 #include "backends/networking/sdl_net/handlerutils.h"
00027 #include "backends/networking/sdl_net/localwebserver.h"
00028 #include "common/translation.h"
00029 
00030 namespace Networking {
00031 
00032 DownloadFileHandler::DownloadFileHandler() {}
00033 
00034 DownloadFileHandler::~DownloadFileHandler() {}
00035 
00037 
00038 void DownloadFileHandler::handle(Client &client) {
00039     Common::String path = client.queryParameter("path");
00040 
00041     // check that <path> is not an absolute root
00042     if (path == "" || path == "/") {
00043         HandlerUtils::setFilesManagerErrorMessageHandler(client, _("Invalid path!"));
00044         return;
00045     }
00046 
00047     // check that <path> contains no '../'
00048     if (HandlerUtils::hasForbiddenCombinations(path)) {
00049         HandlerUtils::setFilesManagerErrorMessageHandler(client, _("Invalid path!"));
00050         return;
00051     }
00052 
00053     // transform virtual path to actual file system one
00054     Common::String prefixToRemove = "", prefixToAdd = "";
00055     if (!transformPath(path, prefixToRemove, prefixToAdd, false) || path.empty()) {
00056         HandlerUtils::setFilesManagerErrorMessageHandler(client, _("Invalid path!"));
00057         return;
00058     }
00059 
00060     // check that <path> exists, is directory and isn't forbidden
00061     AbstractFSNode *node = g_system->getFilesystemFactory()->makeFileNodePath(path);
00062     if (!HandlerUtils::permittedPath(node->getPath())) {
00063         HandlerUtils::setFilesManagerErrorMessageHandler(client, _("Invalid path!"));
00064         return;
00065     }
00066     if (!node->exists()) {
00067         HandlerUtils::setFilesManagerErrorMessageHandler(client, _("The file doesn't exist!"));
00068         return;
00069     }
00070     if (node->isDirectory()) {
00071         HandlerUtils::setFilesManagerErrorMessageHandler(client, _("Can't download a directory!"));
00072         return;
00073     }
00074     Common::SeekableReadStream *stream = node->createReadStream();
00075     if (stream == nullptr) {
00076         HandlerUtils::setFilesManagerErrorMessageHandler(client, _("Failed to read the file!"));
00077         return;
00078     }
00079 
00080     GetClientHandler *handler = new GetClientHandler(stream);
00081     handler->setResponseCode(200);
00082     handler->setHeader("Content-Type", "application/force-download");
00083     handler->setHeader("Content-Disposition", "attachment; filename=\"" + node->getDisplayName() + "\"");
00084     handler->setHeader("Content-Transfer-Encoding", "binary");
00085     client.setHandler(handler);
00086 }
00087 
00088 } // End of namespace Networking


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