Initial commit

Add .gitignore to exclude VSCode workspace files and build artifacts

handler.cpp

@@ -0,0 +1,27 @@
+#include "handler.hpp"
+
+std::string process(const std::string &username){
+    try{
+        // Check for directory traversal patterns
+        if (username.find("../") != std::string::npos ||
+            username.find("..\\") != std::string::npos ||
+            username.find("%2e%2e%2f") != std::string::npos ||
+            username.find("%2e%2e%5c") != std::string::npos ||
+            username.find("%2E%2E%2F") != std::string::npos ||
+            username.find("%2E%2E%5C") != std::string::npos ||
+            username.find("..%2f") != std::string::npos ||
+            username.find("..%5c") != std::string::npos ||
+            username.find("..%2F") != std::string::npos ||
+            username.find("..%5C") != std::string::npos) {
+            throw InvalidInput("Directory traversal detected in username");
+        }
+
+        if (username.find("/") != std::string::npos){
+            throw InvalidInput("Path detected in username");
+        }
+    }
+    catch(InvalidInput&e){
+        return std::string("InvalidInput: ") + e.what() + std::string("\r\n");
+    }
+    return username;
+}