applied platformio structure

lib/spotify/cspot/include/AccessKeyFetcher.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <atomic>      // or std::atomic
+#include <functional>  // for function
+#include <memory>      // for shared_ptr
+#include <string>      // for string
+
+namespace cspot {
+struct Context;
+
+class AccessKeyFetcher {
+ public:
+  AccessKeyFetcher(std::shared_ptr<cspot::Context> ctx);
+
+  /**
+  * @brief Checks if key is expired
+  * @returns true when currently held access key is not valid
+  */
+  bool isExpired();
+
+  /**
+  * @brief Fetches a new access key
+  * @remark In case the key is expired, this function blocks until a refresh is done.
+  * @returns access key
+  */
+  std::string getAccessKey();
+
+  /**
+  * @brief Forces a refresh of the access key
+  */
+  void updateAccessKey();
+
+ private:
+  std::shared_ptr<cspot::Context> ctx;
+
+  std::atomic<bool> keyPending = false;
+  std::string accessKey;
+  long long int expiresAt;
+};
+}  // namespace cspot