init

lib/data/session.hpp

@@ -0,0 +1,33 @@
+#pragma once
+#include <Arduino.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/semphr.h> // Required for mutex
+
+// Represents an active session.
+// An empty username (username[0] == '\0') indicates the slot is free.
+struct Session {
+    char username[33];
+    char token[17];           // 16 chars + null terminator
+    unsigned long expiry_time; // Expiration timestamp from millis()
+};
+
+class SessionManager {
+public:
+    SessionManager();
+    ~SessionManager(); // Destructor to clean up the mutex
+
+    const char* createSession(const char* username);
+    const char* validateSession(const char* token);
+    bool endSession(const char* token);
+    void cleanupExpiredSessions();
+
+private:
+    static constexpr size_t MAX_SESSIONS = 3;
+    Session sessions_[MAX_SESSIONS];
+    SemaphoreHandle_t session_mutex_; // Mutex to protect access to sessions_
+
+    void generateToken(char* buffer, size_t buffer_size);
+};
+
+// Central, global instance.
+extern SessionManager sessionManager;