feat: base go mkiso

internal/middleware/auth.go

@@ -0,0 +1,21 @@
+package middleware
+
+import (
+	"net/http"
+)
+
+// APIKey returns middleware that validates the X-API-Key header
+// against the expected key. Returns 401 if missing or invalid.
+func APIKey(expectedKey string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			if r.Header.Get("X-API-Key") != expectedKey {
+				w.Header().Set("Content-Type", "application/json")
+				w.WriteHeader(http.StatusUnauthorized)
+				w.Write([]byte(`{"error":"unauthorized"}`))
+				return
+			}
+			next.ServeHTTP(w, r)
+		})
+	}
+}