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/*
Copyright (©) 2003-2025 Teus Benschop.
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 3 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <sync/files.h>
#include <filter/url.h>
#include <filter/roles.h>
#include <filter/string.h>
#include <database/logs.h>
#include <client/logic.h>
#include <locale/translate.h>
#include <webserver/request.h>
#include <sync/logic.h>
#include <checksum/logic.h>
std::string sync_files_url ()
{
return "sync/files";
}
std::string sync_files (Webserver_Request& webserver_request)
{
Sync_Logic sync_logic (webserver_request);
if (!sync_logic.security_okay ()) {
// When the Cloud enforces https, inform the client to upgrade.
webserver_request.response_code = 426;
return std::string();
}
// If the client's IP address very recently made a prioritized server call,
// then delay the current call.
// This is the way to give priority to the other call:
// Not clogging the client's internet connection.
if (sync_logic.prioritized_ip_address_active ()) {
std::this_thread::sleep_for (std::chrono::seconds (5));
}
if (webserver_request.post.empty ()) {
for (auto& [key, value] : webserver_request.query) {
webserver_request.post.emplace_back(key, value);
}
}
const std::string user = filter::strings::hex2bin (webserver_request.post_get("u"));
const int action = filter::strings::convert_to_int (webserver_request.post_get("a"));
const int version = filter::strings::convert_to_int (webserver_request.post_get("v"));
const size_t d = static_cast<size_t>(filter::strings::convert_to_int (webserver_request.post_get("d")));
const std::string file = webserver_request.post_get("f");
// For security reasons a client does not specify the directory of the file to be downloaded.
// Rather it specifies the offset within the list of allowed directories for the version.
const std::vector <std::string> directories = Sync_Logic::files_get_directories (version, user);
if (d >= directories.size ()) {
webserver_request.response_code = 400;
return std::string();
}
const std::string directory = directories [d];
if (action == Sync_Logic::files_total_checksum) {
return std::to_string (Sync_Logic::files_get_total_checksum (version, user));
}
else if (action == Sync_Logic::files_directory_checksum) {
int checksum = Sync_Logic::files_get_directory_checksum (directory);
return std::to_string (checksum);
}
else if (action == Sync_Logic::files_directory_files) {
std::vector <std::string> paths = Sync_Logic::files_get_files (directory);
return filter::strings::implode (paths, "\n");
}
else if (action == Sync_Logic::files_file_checksum) {
int checksum = Sync_Logic::files_get_file_checksum (directory, file);
return std::to_string (checksum);
}
else if (action == Sync_Logic::files_file_download) {
// This triggers the correct mime type.
webserver_request.get = "file.download";
// Return the file's contents.
const std::string path = filter_url_create_root_path ({directory, file});
return filter_url_file_get_contents (path);
}
// Bad request. Delay flood of bad requests.
std::this_thread::sleep_for (std::chrono::seconds (1));
webserver_request.response_code = 400;
return std::string();
}
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