Textractor/extensions/deepltranslate.cpp

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#include "qtcommon.h"
#include "extension.h"
#include "network.h"
#include <random>
extern const wchar_t* TRANSLATION_ERROR;
extern const char* USE_PREV_SENTENCE_CONTEXT;
extern QSettings settings;
extern QFormLayout* display;
extern Synchronized<std::wstring> translateTo;
const char* TRANSLATION_PROVIDER = "DeepL Translate";
QStringList languages
{
"Chinese: ZH",
"Dutch: NL",
"English: EN",
"French: FR",
"German: DE",
"Italian: IT",
"Japanese: JA",
"Polish: PL",
"Portuguese: PT",
"Russian: RU",
"Spanish: ES",
};
const wchar_t* accept[] = { L"*/*", nullptr };
Synchronized<std::wstring> LMTBID;
bool useContext = true;
Synchronized<std::unordered_map<int64_t, std::wstring>> context;
BOOL WINAPI DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
auto checkbox = new QCheckBox;
checkbox->setChecked(useContext);
display->addRow(USE_PREV_SENTENCE_CONTEXT, checkbox);
QObject::connect(checkbox, &QCheckBox::clicked, [](bool checked) { settings.setValue(USE_PREV_SENTENCE_CONTEXT, useContext = checked); });
}
break;
case DLL_PROCESS_DETACH:
{
}
break;
}
return TRUE;
}
std::pair<bool, std::wstring> Translate(const std::wstring& text, SentenceInfo sentenceInfo)
{
// the following code was reverse engineered from the DeepL website; it's as close as I could make it but I'm not sure what parts of this could be removed and still have it work
int64_t r = _time64(nullptr), n = std::count(text.begin(), text.end(), L'i') + 1LL;
static std::atomic<int> id = 10000 * std::uniform_int_distribution(0, 9999)(std::mt19937(std::random_device()()));
std::string jsonText;
for (auto ch : WideStringToString(text))
if (ch == '"') jsonText += "\\\"";
else jsonText += ch;
// user_preferred_langs? what should preferred_num_beans and priority be? does timestamp do anything? other translation quality options?
auto body = FormatString(R"(
{
"id": %d,
"jsonrpc": "2.0",
"method": "LMT_handle_jobs",
"params": {
"priority": -1,
"timestamp": %lld,
"lang": {
"source_lang_user_selected": "auto",
"target_lang": "%s"
},
"jobs": [{
"kind": "default",
"preferred_num_beams": 4,
"quality": "fast",
"raw_en_context_after": [],
"raw_en_sentence": "%s",
"raw_en_context_before": [%s]
}]
}
}
)", ++id, r + (n - r % n), WideStringToString(translateTo->c_str()), jsonText, useContext ? WideStringToString(context->operator[](sentenceInfo["text number"])) : "");
context->insert_or_assign(sentenceInfo["text number"], L'"' + text + L'"');
std::wstring headers = L"Host: www2.deepl.com\r\nAccept-Language: en-US,en;q=0.5\r\nContent-type: text/plain\r\nOrigin: https://www.deepl.com\r\nTE: Trailers"
+ LMTBID.Acquire().contents;
if (HttpRequest httpRequest{
L"Mozilla/5.0 Textractor",
L"www2.deepl.com",
L"POST",
L"/jsonrpc",
WINHTTP_FLAG_SECURE,
NULL,
L"https://www.deepl.com/translator",
accept,
headers.c_str(),
body.data(),
body.size()
})
{
auto LMTBID = httpRequest.headers.find(L"LMTBID="), end = httpRequest.headers.find(L';', LMTBID); // not sure if this cookie does anything
if (LMTBID != std::wstring::npos && end != std::wstring::npos) ::LMTBID->assign(L"\r\nCookie: " + httpRequest.headers.substr(LMTBID, end - LMTBID));
// Response formatted as JSON: translation starts with preprocessed_sentence":" and ends with ","
if (std::wsmatch results; std::regex_search(httpRequest.response, results, std::wregex(L"postprocessed_sentence\":\"(.+?)\",\""))) return { true, results[1] };
else return { false, FormatString(L"%s: %s", TRANSLATION_ERROR, httpRequest.response) };
}
else return { false, FormatString(L"%s (code=%u)", TRANSLATION_ERROR, httpRequest.errorCode) };
}