LibreX-fork/engines/special/currency.php

<?php
    class CurrencyRequest extends EngineRequest {
        public function get_request_url() {
            return "https://cdn.moneyconvert.net/api/latest.json";
        }
        
        public function parse_results($response) {
            $split_query = explode(" ", $this->query);

            $base_currency = strtoupper($split_query[1]);
            $currency_to_convert = strtoupper($split_query[3]);
            $amount_to_convert = floatval($split_query[0]);   
            
            $json_response = json_decode($response, true);
                    
            $rates =  $json_response["rates"];

            if (!array_key_exists($base_currency, $rates) || !array_key_exists($currency_to_convert, $rates))
                return array();
            $base_currency_response = $rates[$base_currency];
            $currency_to_convert_response = $rates[$currency_to_convert];

            $conversion_result = ($currency_to_convert_response / $base_currency_response) * $amount_to_convert;

            $formatted_response = "$amount_to_convert $base_currency = $conversion_result $currency_to_convert";
            $source = "https://moneyconvert.net/";
            return array(
                "special_response" => array(
                    "response" => htmlspecialchars($formatted_response),
                    "source" => $source
                )
            );
        }
    }
?>