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#include "token.hpp"
#include <charconv>
#include <chrono>
#include <curl/curl.h>
#include <format>
#include <fstream>
#include <iostream>
#include <regex>
#include <system_error>
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; }
const bool Token::hasTokenExpired() const {
std::ifstream aTokenFile{mFilePath};
std::string aLine;
std::getline(aTokenFile, aLine);
if (aLine.empty()) {
return true;
}
const std::string kTimeLimitText{aLine.substr(aLine.find(" ") + 1)};
long int aTimeLimit;
const auto kConversionStatus{
std::from_chars(kTimeLimitText.data(), kTimeLimitText.data() + kTimeLimitText.size(), aTimeLimit)};
if (kConversionStatus.ec != std::errc{}) {
std::cerr << "Conversion of token timestamp failed.\n";
return true;
}
const bool kTokenExpired{
std::chrono::duration_cast<std::chrono::seconds>(std::chrono::utc_clock::now().time_since_epoch()).count() >=
aTimeLimit};
if (kTokenExpired) {
return true;
}
return false;
}
std::string Token::getTokenFromLocalFile() const {
std::ifstream aTokenFile{mFilePath};
std::string aLine;
std::getline(aTokenFile, aLine);
return aLine.substr(0, aLine.find(" "));
}
std::string Token::getValidToken() {
if (hasTokenExpired()) {
return writeNewTokenToLocalFile();
}
return getTokenFromLocalFile();
}
std::string Token::writeNewTokenToLocalFile() const {
std::fstream aTokenFile{mFilePath};
std::string aLine;
std::getline(aTokenFile, aLine);
const std::string kToken{getTokenWithApi()};
if (not kToken.empty()) {
std::chrono::seconds aExpiresAt{getCurrentTime() + std::chrono::hours(24)};
aTokenFile << kToken << " " << aExpiresAt.count() << '\n';
return kToken;
}
std::cerr << "Error: no valid token can be generated.\n";
return "";
}
std::string Token::getTokenWithApi() const {
CURL *aCurl{curl_easy_init()};
std::string aTokenInfo;
if (aCurl) {
curl_easy_setopt(aCurl, CURLOPT_URL, "https://oauth.battle.net/token");
curl_easy_setopt(aCurl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(aCurl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_setopt(aCurl, CURLOPT_WRITEFUNCTION, curlCallbackStringOutput);
curl_easy_setopt(aCurl, CURLOPT_WRITEDATA, &aTokenInfo);
curl_easy_setopt(aCurl, CURLOPT_USERPWD, std::format("{}:{}", mUsername, mPassword).data());
curl_easy_setopt(aCurl, CURLOPT_POSTFIELDS, "grant_type=client_credentials");
CURLcode result_code{curl_easy_perform(aCurl)};
curl_easy_cleanup(aCurl);
if (result_code != CURLE_OK) {
std::cerr << "ERROR: token request failed" << std::endl;
std::exit(EXIT_FAILURE);
}
}
return extractTokenWithRegex(aTokenInfo, "\"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 {
const std::regex kRegex{iRegex};
std::smatch aMatches;
if (std::regex_search(iText, aMatches, kRegex)) {
return aMatches[1].str();
}
std::cerr << std::format("Unable to retrieve token with regex '{}'", iRegex);
return "";
}
size_t Token::curlCallbackStringOutput(void *iPtr, size_t iSize, size_t iNmemb, std::string *iUserData) {
size_t newLength{iSize * iNmemb};
try {
iUserData->append(static_cast<char *>(iPtr), newLength);
} catch (std::bad_alloc &e) {
// handle memory problem
return 0;
}
return newLength;
}
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