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#include "token.hpp"
#include <chrono>
#include <cstdint>
#include <curl/curl.h>
#include <format>
#include <fstream>
#include <iostream>
#include <nlohmann/json.hpp>
#include <utility>
using json = nlohmann::json;
Token::Token(const std::string &iTokenFilePath)
: mFilePath{iTokenFilePath}, mToken{generateToken()} {}
std::string Token::text() const { return mToken; }
const bool Token::hasExpired() const {
std::ifstream aTokenFile{mFilePath};
json aCredentialsFile = json::parse(aTokenFile);
if (not aCredentialsFile.contains("Token") or
not aCredentialsFile["Token"].contains("ExpirationTime") or
not aCredentialsFile["Token"].contains("Content")) {
return true;
}
if (aCredentialsFile["Token"]["Content"].dump().length() <
kTokenContentMinLength) {
return true;
}
const std::uint64_t kExpirationTime{
aCredentialsFile["Token"]["ExpirationTime"]};
const std::uint64_t kCurrentTime{static_cast<std::uint64_t>(
std::chrono::duration_cast<std::chrono::seconds>(
std::chrono::high_resolution_clock::now().time_since_epoch())
.count())};
if (kCurrentTime >= kExpirationTime) {
return true;
}
return false;
}
std::string Token::getTokenFromLocalFile() const {
std::ifstream aTokenFile{mFilePath};
return json::parse(aTokenFile)["Token"]["Content"];
}
std::string Token::generateToken() {
if (hasExpired()) {
const std::pair<std::string, std::uint64_t> kTokenContent{
getTokenWithApi()};
writeTokenToLocalFile(kTokenContent);
}
return getTokenFromLocalFile();
}
void Token::writeTokenToLocalFile(
const std::pair<std::string, std::uint64_t> &iToken) const {
std::ifstream aTokenFileInput{mFilePath};
json aCredentialsFile = json::parse(aTokenFileInput);
aCredentialsFile["Token"]["Content"] = iToken.first;
aCredentialsFile["Token"]["ExpirationTime"] =
std::chrono::duration_cast<std::chrono::seconds>(
getCurrentTime() + std::chrono::seconds(iToken.second))
.count();
std::ofstream aTokenFileOutput{mFilePath};
aTokenFileOutput << std::setw(4) << aCredentialsFile;
}
std::pair<std::string, std::uint64_t> Token::getTokenWithApi() const {
std::ifstream aCredentialsFile{mFilePath};
json aCredentials = json::parse(aCredentialsFile);
if (not aCredentials.contains("Agent") or
not aCredentials["Agent"].contains("Username") or
not aCredentials["Agent"].contains("Password")) {
std::cerr << "Please define Agent/Username and Agent/Password in the "
"JSON credentials file\n";
std::exit(EXIT_FAILURE);
}
const std::string kAgentUsername{aCredentials["Agent"]["Username"]};
const std::string kAgentPassword{aCredentials["Agent"]["Password"]};
CURL *aCurl{curl_easy_init()};
std::string aTokenInfo;
if (aCurl and not kAgentUsername.empty() and not kAgentPassword.empty()) {
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("{}:{}", kAgentUsername, kAgentPassword).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);
}
}
json aTokenJson = json::parse(aTokenInfo);
return std::make_pair(aTokenJson["access_token"], aTokenJson["expires_in"]);
}
std::chrono::seconds Token::getCurrentTime() const {
return std::chrono::duration_cast<std::chrono::seconds>(
std::chrono::utc_clock::now().time_since_epoch());
}
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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