Expand code for exchange rates

app/Support/Http/Api/ExchangeRateConverter.php

@@ -0,0 +1,59 @@
+<?php
+/*
+ * ExchangeRateConverter.php
+ * Copyright (c) 2023 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace FireflyIII\Support\Http\Api;
+
+use Carbon\Carbon;
+use FireflyIII\Exceptions\FireflyException;
+use FireflyIII\Models\TransactionCurrency;
+
+/**
+ * Class ExchangeRateConverter
+ */
+class ExchangeRateConverter
+{
+    use ConvertsExchangeRates;
+
+    /**
+     * @param TransactionCurrency $from
+     * @param TransactionCurrency $to
+     * @param Carbon              $date
+     *
+     * @return string
+     * @throws FireflyException
+     */
+    public function getCurrencyRate(TransactionCurrency $from, TransactionCurrency $to, Carbon $date): string
+    {
+        if (null === $this->enabled) {
+            $this->getPreference();
+        }
+
+        // if not enabled, return "1"
+        if (false === $this->enabled) {
+            return '1';
+        }
+
+        $rate = $this->getRate($from, $to, $date);
+        return '0' === $rate ? '1' : $rate;
+    }
+
+
+}