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#include "token.hpp"
#include <chrono>
#include <curl/curl.h>
#include <format>
#include <fstream>
#include <iostream>
#include <regex>
Token::Token(const std::string &iTokenFilePath, const std::string &iUsername, const std::string &iPassword)
: mFilePath{iTokenFilePath}, mUsername{iUsername}, mPassword{iPassword}, mToken{getValidToken()} {}
std::string Token::toString() const { return mToken; }
std::string Token::getValidToken() const {
refreshToken();
std::ifstream token_file(mFilePath);
std::string line;
std::getline(token_file, line);
std::string token = line.substr(0, line.find(" "));
return token;
}
void Token::refreshToken() const {
std::ifstream token_file{mFilePath};
std::string line;
std::getline(token_file, line);
if (line.empty()) {
writeNewTokenToFile();
} else {
long expire_at = std::stoull(line.substr(line.find(" ") + 1));
if (std::chrono::duration_cast<std::chrono::seconds>(std::chrono::utc_clock::now().time_since_epoch())
.count() >= expire_at) {
writeNewTokenToFile();
}
}
}
void Token::writeNewTokenToFile() const {
std::string aToken{getValidTokenWithApi()};
if (not aToken.empty()) {
writeTokenToFile(aToken);
}
}
void Token::writeTokenToFile(const std::string &iToken) const {
std::ofstream token_file{mFilePath};
std::chrono::seconds expires_at = getCurrentTime() + std::chrono::hours(24);
token_file << iToken << " " << expires_at.count() << '\n';
}
std::string Token::getValidTokenWithApi() const {
CURL *curl = curl_easy_init();
std::string token_info;
if (curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://oauth.battle.net/token");
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curlCallbackStringOutput);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &token_info);
curl_easy_setopt(curl, CURLOPT_USERPWD, std::format("{}:{}", mUsername, mPassword).data());
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "grant_type=client_credentials");
CURLcode result_code;
result_code = curl_easy_perform(curl);
curl_easy_cleanup(curl);
if (result_code != CURLE_OK) {
std::cerr << "ERROR: token request failed" << std::endl;
std::exit(EXIT_FAILURE);
}
}
return extractTokenWithRegex(token_info, "\"access_token\":\"(\\w+)\"");
}
std::chrono::seconds Token::getCurrentTime() const {
return std::chrono::duration_cast<std::chrono::seconds>(std::chrono::utc_clock::now().time_since_epoch());
}
std::string Token::extractTokenWithRegex(const std::string &iText, const std::string &iRegex) const {
std::regex regex(iRegex);
auto aMatchBegin = std::sregex_iterator(iText.begin(), iText.end(), regex);
auto aMatchEnd = std::sregex_iterator();
if (std::distance(aMatchBegin, aMatchEnd) > 0) {
std::smatch match = *aMatchBegin;
return match[1].str();
}
return "";
}
size_t Token::curlCallbackStringOutput(void *t_contents, size_t t_size, size_t t_nmemb, std::string *t_s) {
size_t newLength = t_size * t_nmemb;
try {
t_s->append(static_cast<char *>(t_contents), newLength);
} catch (std::bad_alloc &e) {
// handle memory problem
return 0;
}
return newLength;
}
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