crowsite/libs/crow/examples/example_file_upload.cpp

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2023-08-25 03:48:59 -04:00
#include "crow.h"
int main()
{
crow::SimpleApp app;
CROW_ROUTE(app, "/uploadfile")
.methods(crow::HTTPMethod::Post)([](const crow::request& req) {
crow::multipart::message file_message(req);
for (const auto& part : file_message.part_map)
{
const auto& part_name = part.first;
const auto& part_value = part.second;
CROW_LOG_DEBUG << "Part: " << part_name;
if ("InputFile" == part_name)
{
// Extract the file name
auto headers_it = part_value.headers.find("Content-Disposition");
if (headers_it == part_value.headers.end())
{
CROW_LOG_ERROR << "No Content-Disposition found";
return crow::response(400);
}
auto params_it = headers_it->second.params.find("filename");
if (params_it == headers_it->second.params.end())
{
CROW_LOG_ERROR << "Part with name \"InputFile\" should have a file";
return crow::response(400);
}
const std::string outfile_name = params_it->second;
for (const auto& part_header : part_value.headers)
{
const auto& part_header_name = part_header.first;
const auto& part_header_val = part_header.second;
CROW_LOG_DEBUG << "Header: " << part_header_name << '=' << part_header_val.value;
for (const auto& param : part_header_val.params)
{
const auto& param_key = param.first;
const auto& param_val = param.second;
CROW_LOG_DEBUG << " Param: " << param_key << ',' << param_val;
}
}
// Create a new file with the extracted file name and write file contents to it
std::ofstream out_file(outfile_name);
if (!out_file)
{
CROW_LOG_ERROR << " Write to file failed\n";
continue;
}
out_file << part_value.body;
out_file.close();
CROW_LOG_INFO << " Contents written to " << outfile_name << '\n';
}
else
{
CROW_LOG_DEBUG << " Value: " << part_value.body << '\n';
}
}
return crow::response(200);
});
// enables all log
app.loglevel(crow::LogLevel::Debug);
app.port(18080)
.multithreaded()
.run();
return 0;
}