1 files changed, 96 insertions, 0 deletions
diff --git a/subprojects/battleNetApi/src/token.cpp b/subprojects/battleNetApi/src/token.cpp
new file mode 100644
index 0000000..7d2e20e
--- /dev/null
+++ b/subprojects/battleNetApi/src/token.cpp
@@ -0,0 +1,96 @@
+#include "token.hpp"
+#include <chrono>
+#include <curl/curl.h>
+#include <format>
+#include <fstream>
+#include <iostream>
+#include <regex>
+
+Token::Token(const std::string &iTokenFilePath) : mFilePath{iTokenFilePath} {}
+
+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::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()) {
+        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()};
+    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,
+                         "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);
+        }
+    }
+
+    return extractFirstMatchRegex(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::extractFirstMatchRegex(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;
+}