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Copy pathMultipartFormData.cpp
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433 lines (329 loc) · 9.83 KB
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#include "../../utils/Utils.h"
#include "MultipartFormData.h"
#include <fstream>
namespace DataVariant
{
MultipartFormData::MultipartFormData() noexcept {
this->data_variant_name = "multipart/form-data";
}
enum class ParsingState : uint8_t {
INITIALIZATION = 0,
FIND_DATA_BLOCK,
GET_DATA_BLOCK_TYPE,
COPY_DATA_BLOCK,
SAVE_DATA_BLOCK,
};
enum class BlockType : uint8_t {
UNKNOWN = 0,
DATA,
FILE,
};
struct StateMultipartFormData {
std::string block_name;
std::string block_value;
std::string file_tmp_name;
std::string file_name;
std::string file_type;
std::ofstream file;
std::string boundary;
ParsingState state;
BlockType block_type;
};
void *MultipartFormData::createStateStruct(
const Transfer::request_data *rd,
const std::unordered_map<std::string, std::string> &contentParams
) const {
std::string boundary;
auto const it = contentParams.find("boundary");
if (contentParams.cend() != it) {
boundary = it->second;
}
return new StateMultipartFormData {
std::string(), std::string(), std::string(), std::string(), std::string(), std::ofstream(),
std::move(boundary), ParsingState::INITIALIZATION, BlockType::UNKNOWN
};
}
void MultipartFormData::destroyStateStruct(void *st) const noexcept {
delete reinterpret_cast<StateMultipartFormData *>(st);
}
static std::unordered_map<std::string, std::string> parseHeader(const std::string &buf, size_t cur, const size_t end)
{
const std::string nl("\r\n");
std::unordered_map<std::string, std::string> headers;
for (
size_t line_end = buf.find(nl.data(), cur);
cur < end;
line_end = buf.find(nl.data(), cur)
) {
size_t delimiter = buf.find(':', cur);
if (std::string::npos == delimiter || delimiter > line_end)
{
std::string header_name = buf.substr(cur, line_end - cur);
Utils::trim(header_name);
Utils::toLower(header_name);
headers.emplace(
std::move(header_name),
std::string()
);
} else {
std::string header_name = buf.substr(cur, delimiter - cur);
Utils::trim(header_name);
Utils::toLower(header_name);
++delimiter;
std::string header_value = buf.substr(delimiter, line_end - delimiter);
Utils::trim(header_value);
headers.emplace(
std::move(header_name),
std::move(header_value)
);
}
// Перейти к следующему заголовку
cur = line_end + nl.length();
}
return headers;
}
static std::unordered_map<std::string, std::string> parseMainHeaderParams(const std::string &header)
{
// Разобрать значение заголовка данных на параметры
std::unordered_map<std::string, std::string> header_params;
size_t delimiter = header.find(';');
if (std::string::npos == delimiter) {
return header_params;
}
std::string content_disposition(header.substr(0, delimiter) );
Utils::trim(content_disposition);
// Проверить соответствие указанного формата
if ("form-data" != content_disposition) {
return header_params;
}
// Получить параметры блока данных
for (size_t cur = delimiter + 1, end; std::string::npos != cur; cur = end)
{
end = header.find(';', cur);
delimiter = header.find('=', cur);
if (std::string::npos == delimiter || delimiter > end)
{
std::string param_name = header.substr(
cur,
std::string::npos != end
? end - cur
: std::string::npos
);
Utils::trim(param_name);
Utils::toLower(param_name);
header_params.emplace(
std::move(param_name),
std::string()
);
} else {
std::string param_name = header.substr(cur, delimiter - cur);
Utils::trim(param_name);
Utils::toLower(param_name);
++delimiter;
delimiter = header.find('"', delimiter);
if (std::string::npos == delimiter)
{
end = header.find(';', cur);
std::string param_value = header.substr(
delimiter,
std::string::npos != end
? end - delimiter
: std::string::npos
);
Utils::trim(param_value);
header_params.emplace(
std::move(param_name),
std::move(param_value)
);
} else {
++delimiter;
cur = header.find('"', delimiter);
end = header.find(';', cur);
std::string param_value = header.substr(
delimiter,
std::string::npos != cur
? cur - delimiter
: std::string::npos
);
header_params.emplace(
std::move(param_name),
std::move(param_value)
);
}
}
if (std::string::npos != end) {
++end;
}
}
return header_params;
}
bool MultipartFormData::parse(
const std::string &buf,
Transfer::request_data *rd,
DataReceiver *dr
) const {
StateMultipartFormData *ss = reinterpret_cast<StateMultipartFormData *>(dr->ss);
size_t cur = 0;
while (cur < buf.size() )
{
switch (ss->state)
{
case ParsingState::INITIALIZATION:
{
if (ss->boundary.empty() ) {
return false;
}
const std::string data_end("--" + ss->boundary + "--\r\n");
if (buf.size() < data_end.length() ) {
dr->left = buf.size();
return dr->full_size != dr->recv_total;
}
if (0 == buf.find(data_end) ) {
return dr->full_size == data_end.length() && dr->full_size == dr->recv_total;
}
const std::string first_block("--" + ss->boundary);
cur = buf.find(first_block);
if (0 != cur) {
return false;
}
cur += first_block.length() + 2;
ss->state = ParsingState::GET_DATA_BLOCK_TYPE;
break;
}
case ParsingState::FIND_DATA_BLOCK:
{
dr->left = buf.size() - cur;
const std::string data_end("\r\n--" + ss->boundary + "--\r\n");
if (data_end.length() > dr->left) {
return dr->full_size != dr->recv_total;
}
const size_t end = buf.find(data_end, cur);
if (end == cur) {
dr->left -= data_end.length();
return dr->full_size == dr->recv_total;
}
const std::string block_delimiter("\r\n--" + ss->boundary);
cur = buf.find(block_delimiter, cur);
if (std::string::npos == cur) {
return dr->full_size != dr->recv_total;
}
cur += block_delimiter.length() + 2;
ss->state = ParsingState::GET_DATA_BLOCK_TYPE;
// break;
}
case ParsingState::GET_DATA_BLOCK_TYPE:
{
const size_t end = buf.find("\r\n\r\n", cur);
if (std::string::npos == end) {
dr->left = buf.size() - cur;
return dr->full_size != dr->recv_total;
}
// Разобрать заголовки блока данных
const std::unordered_map<std::string, std::string> headers = parseHeader(buf, cur, end);
// Определить параметры блока данных
auto const it = headers.find("content-disposition");
// Если заголовок не определён
if (headers.cend() == it) {
return false;
}
const std::unordered_map<std::string, std::string> header_params = parseMainHeaderParams(it->second);
// Поиск имени блока данных
auto const it_name = header_params.find("name");
if (header_params.cend() == it_name) {
return false;
}
ss->block_name = it_name->second;
auto const it_filename = header_params.find("filename");
ss->block_type = header_params.cend() == it_filename ? BlockType::DATA : BlockType::FILE;
if (BlockType::FILE == ss->block_type)
{
ss->file_name = it_filename->second;
// Найти тип файла
auto const it_filetype = headers.find("content-type");
if (headers.cend() != it_filetype) {
ss->file_type = it_filetype->second;
}
// Сгенерировать уникальное имя
ss->file_tmp_name = System::getTempDir() + Utils::getUniqueName();
// Создать файл
ss->file.open(ss->file_tmp_name, std::ofstream::trunc | std::ofstream::binary);
if (ss->file.is_open() == false) {
return false;
}
}
// Перейти к данным
cur = end + 4;
ss->state = ParsingState::COPY_DATA_BLOCK;
// break;
}
case ParsingState::COPY_DATA_BLOCK:
{
const std::string block_delimiter("\r\n--" + ss->boundary);
// Поиск конца блока данных (возможное начало следующего блока)
const size_t block_end = buf.find(block_delimiter, cur);
const size_t end = (std::string::npos == block_end) ? buf.size() - block_delimiter.length() : block_end;
switch (ss->block_type)
{
case BlockType::DATA: {
ss->block_value.append(
buf.cbegin() + long(cur),
buf.cbegin() + long(end)
);
break;
}
case BlockType::FILE: {
ss->file.write(
&buf[cur],
std::streamsize(end - cur)
);
break;
}
default:
return false;
}
if (std::string::npos == block_end) {
dr->left = buf.size() - end;
return dr->full_size != dr->recv_total;
}
cur = end;
ss->state = ParsingState::SAVE_DATA_BLOCK;
// break;
}
case ParsingState::SAVE_DATA_BLOCK:
{
switch (ss->block_type)
{
case BlockType::DATA: {
rd->incoming_data.emplace(
std::move(ss->block_name),
std::move(ss->block_value)
);
break;
}
case BlockType::FILE: {
rd->incoming_files.emplace(
std::move(ss->block_name),
Transfer::FileIncoming(
std::move(ss->file_tmp_name),
std::move(ss->file_name),
std::move(ss->file_type),
size_t(ss->file.tellp())
)
);
ss->file.close();
break;
}
default:
return false;
}
ss->state = ParsingState::FIND_DATA_BLOCK;
break;
}
default:
return false;
}
}
return dr->full_size != dr->recv_total;
}
}