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#define CURL_STATICLIB

#include <curl/curl.h>
#include <string>
#include <fstream>
#include <vector>
#include <iostream>
#include <filesystem>
#include <random>
#include <thread>



std::vector<std::thread> threads;

std::string target_mail = "";
std::vector <std::string> mail_reqs;

int mail1 = 0, mail2 = 0;

std::string generate_verification_code() {
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<int> dist(100000, 999999);
    int sayi = dist(gen);
    return std::to_string(sayi);
}

static std::string st;

static const char* payload_text[] = {
     "Date: Mon, 29 Nov 2021 21:54:29 +0000\r\n",
     "Subject: Lifetopia Hesabını Doğrula\r\n",
     "\r\n", /* empty line to divide headers from body, see RFC5322 */
     // "Welcome to Lifetopia Private Server\r\n",
      "Doğrulama kodunuz: ",
      st.c_str(),
      "\r\n\n",
      "Sunucumuza hoşgeldin, doğru bir sunucu seçimi yaptığın için yaşayabileceğin en iyi oyun deneyimine hak kazandın!",
      "\r\n\n",
      "-XD3TR & Avare\r\n",
     NULL
};

struct upload_status {
    int lines_read;
};

static size_t payload_source(void* ptr, size_t size, size_t nmemb, void* userp)
{
    struct upload_status* upload_ctx = (struct upload_status*)userp;
    const char* data;

    if ((size == 0) || (nmemb == 0) || ((size * nmemb) < 1)) {
        return 0;
    }

    data = payload_text[upload_ctx->lines_read];

    if (data) {
        size_t len = strlen(data);
        memcpy(ptr, data, len);
        upload_ctx->lines_read++;
        return len;
    }

    return 0;
}

void send_mail(const char* target_mail2)
{
    std::string path = "codes/" + target_mail + ".txt";
    if (std::filesystem::exists(path))
    {
        std::ofstream cd(path);
        cd << "";
        cd.close();
        std::cout << "- Resent: " << target_mail2 << std::endl;
    }
    else std::cout << "- Sent: " << target_mail2 << std::endl;

    CURL* curl;
    CURLcode res = CURLE_OK;
    struct curl_slist* recipients = NULL;
    struct upload_status upload_ctx;

    upload_ctx.lines_read = 0;

    curl = curl_easy_init();
    if (curl) {
        if (mail1 < 100) {
            curl_easy_setopt(curl, CURLOPT_USERNAME, "ltps.lifetopia@gmail.com");
            curl_easy_setopt(curl, CURLOPT_PASSWORD, "ptvn oxbn tngw krdn");
            mail1++;
        }
        if (mail2 < 100 && mail1 >= 99) {
            curl_easy_setopt(curl, CURLOPT_USERNAME, "ltps.lifetopia@gmail.com");
            curl_easy_setopt(curl, CURLOPT_PASSWORD, "ptvn oxbn tngw krdn");
            mail2++;
        }
        curl_easy_setopt(curl, CURLOPT_URL, "smtp://smtp.gmail.com:587");

        curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
        curl_easy_setopt(curl, CURLOPT_MAIL_FROM, "<ltps.lifetopia@gmail.com>");
        recipients = curl_slist_append(recipients, target_mail2);
        curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
        curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
        curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
        curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

        res = curl_easy_perform(curl);

        if (res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));

        //if (remove(path.c_str()) == 0) std::cout << "- Verification resent to " << target_mail2 << std::endl;
        std::ofstream cd(path, std::ios::app);
        cd << st;
        cd.close();
        curl_slist_free_all(recipients);
        curl_easy_cleanup(curl);
    }
}

void check_req()
{
    while (true)
    {
        if (mail_reqs.size() > 0) {
            for (int i_ = 0; i_ < mail_reqs.size(); ++i_) {
                target_mail = mail_reqs[i_];
                std::string target_mail2 = "<" + target_mail + ">";
                st = generate_verification_code();
                send_mail(target_mail2.c_str());
                std::this_thread::sleep_for(std::chrono::seconds(1));
            }
            mail_reqs.clear();
            
            std::ofstream mail2("mail.txt");
            mail2.clear(), mail2.close();
           // if (remove("mail.txt") == 0) std::cout << "- All requests approved!" << std::endl;
        }
        else
        {
            std::ifstream mail("mail.txt");
            std::string mail_line;
            if (!mail.is_open()) break;

            while (std::getline(mail, mail_line)) mail_reqs.push_back(mail_line), std::cout << "- Received Request: " << mail_line << std::endl;

            std::this_thread::sleep_for(std::chrono::seconds(1));
        }

    }
}


int main()
{
    SetConsoleTitle(L"LTPS Mail Sender");

    threads.push_back(std::thread(check_req));

    for (auto& th : threads) th.join();

    return 0;
}
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