func()

in internal/pkg/core/router/service.go [176:209]

• 22 lines of code
• 6 McCabe index (conditional complexity)

func (rs *RouterService) createQueryParamMiddleware(resource artifacts.Resource, next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// If there are no predefined query parameters, just call the next handler
		if len(resource.URITemplate.QueryParameters) == 0 {
			next(w, r)
			return
		}

		// Get query parameters from the request
		queryParams := r.URL.Query()

		// Check if query parameter keys match exactly with the predefined keys
		// First, ensure all request query params exist in predefined params
		for key := range queryParams {
			if _, exists := resource.URITemplate.QueryParameters[key]; !exists {
				// Query parameter not defined in the template, reject the request
				http.Error(w, fmt.Sprintf("Unsupported query parameter: %s", key), http.StatusBadRequest)
				return
			}
		}

		// Now ensure all predefined query params exist in the request
		for key := range resource.URITemplate.QueryParameters {
			if !queryParams.Has(key) {
				// Required query parameter is missing, reject the request
				http.Error(w, fmt.Sprintf("Missing required query parameter: %s", key), http.StatusBadRequest)
				return
			}
		}

		// All parameters in the request are valid and all required parameters are present
		next(w, r)
	}
}