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#include "hearthstoneAPIHandler.h"
#include <chrono>
#include <curl/curl.h>
#include <format>
#include <fstream>
#include <iostream>
#include <regex>
HearthstoneAPIHandler::HearthstoneAPIHandler()
: m_access_token(get_valid_token()), m_header(generate_request_header()) {}
size_t HearthstoneAPIHandler::curl_callback_string_output(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((char *)t_contents, newLength);
} catch (std::bad_alloc &e) {
// handle memory problem
return 0;
}
return newLength;
}
std::chrono::seconds HearthstoneAPIHandler::get_current_time() {
return std::chrono::duration_cast<std::chrono::seconds>(
std::chrono::utc_clock::now().time_since_epoch());
}
std::string
HearthstoneAPIHandler::extract_string_with_regex(const std::string &t_str,
const std::string t_regex) {
std::regex regex(t_regex);
auto it = std::sregex_iterator(t_str.begin(), t_str.end(), regex);
std::smatch match = *it;
return match[1].str();
}
void HearthstoneAPIHandler::write_new_token_info_to_file(
const std::string &t_file_path) {
std::ofstream token_file(t_file_path);
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,
curl_callback_string_output);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &token_info);
curl_easy_setopt(curl, CURLOPT_USERPWD,
"2b50f1123b424d5e9c21971a110fdd04:"
"MrMkhVMNdOeqPL4Q4XVQAsRPR14J7Yq6");
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);
}
}
std::string token =
extract_string_with_regex(token_info, "\"access_token\":\"(\\w+)\"");
std::chrono::seconds expires_at =
get_current_time() + std::chrono::hours(24);
token_file << token << " " << expires_at.count();
}
void HearthstoneAPIHandler::refresh_token_if_needed() {
std::string file_path =
std::format("{}/resources/token_info.txt", SOURCE_DIR_PATH);
std::ifstream token_file(file_path);
std::string line;
std::getline(token_file, line);
if (line.empty()) {
write_new_token_info_to_file(file_path);
} else {
unsigned 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) {
write_new_token_info_to_file(file_path);
}
}
}
std::string HearthstoneAPIHandler::get_valid_token() {
refresh_token_if_needed();
std::string file_path =
std::format("{}/resources/token_info.txt", SOURCE_DIR_PATH);
std::ifstream token_file(file_path);
std::string line;
std::getline(token_file, line);
std::string token = line.substr(0, line.find(" "));
return token;
}
std::string HearthstoneAPIHandler::generate_request_header() {
return std::format("Authorization: Bearer {}", m_access_token);
}
const std::string
HearthstoneAPIHandler::get_url(const std::string &t_parameters) {
return std::format("https://eu.api.blizzard.com/hearthstone/{}",
t_parameters);
}
const std::string HearthstoneAPIHandler::get_set_of_cards_url(
const std::string &t_card_parameters) {
return get_url(std::format("cards{}", t_card_parameters));
}
std::string HearthstoneAPIHandler::make_api_request(const char *t_url,
const char *t_header) {
CURL *curl = curl_easy_init();
std::string request_output;
if (curl) {
curl_easy_setopt(curl, CURLOPT_URL, t_url);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,
curl_callback_string_output);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &request_output);
struct curl_slist *chunk = nullptr;
chunk = curl_slist_append(chunk, t_header);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
return request_output;
}
std::string
HearthstoneAPIHandler::make_api_request(const std::string &t_url,
const std::string &t_header) {
return make_api_request(t_url.c_str(), t_header.c_str());
}
std::string
HearthstoneAPIHandler::get_cards(const std::string &t_card_parameters) {
return make_api_request(get_set_of_cards_url(t_card_parameters), m_header);
}
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