feat: Added support for getting fiat currency from DuckDuckGo search engine

services/duckduckgo.js

@@ -0,0 +1,48 @@
+const axios = require('axios');
+const config = require('../utils/load_config.js')();
+const { truncate_number } = require('../utils/truncate_number.js');
+
+module.exports = {
+    info: {
+        name: 'DuckDuckGo',
+    },
+    parseCurrencies: async () => {
+        const promises = config['currency']['fiat'].map(fromCurrency => {
+            return config['currency']['fiat'].map(convCurrency => {
+                if (fromCurrency === convCurrency) return Promise.resolve(null);
+
+                const serviceName = module.exports.info.name;
+
+                return axios.get(
+                    `${config['currency']['services']['duckduckgo']['base_url']}${fromCurrency}/${convCurrency}`,
+                )
+                .then((res) => {
+                    const regExp = new RegExp('\\(\\s*(.*)\\s*\\);$', 'mg');
+                    const data = JSON.parse(
+                        Array.from(res.data.matchAll(regExp))[0][1],
+                    );
+                    const truncatedPriceStr = truncate_number(data['to'][0]['mid'], 3);
+                    const rate = parseFloat(truncatedPriceStr);
+
+                    console.log(`Data fetched from ${serviceName}: ${fromCurrency} -> ${convCurrency}, Rate: ${rate}`);
+
+                    return {
+                        from_currency: fromCurrency,
+                        conv_currency: convCurrency,
+                        rate: rate,
+                        date: new Date(data['timestamp']).toISOString().substring(0, 10),
+                    };
+                })
+                .catch((err) => {
+                    console.error(err);
+                    return null;
+                });
+            });
+        });
+
+        const flattenedPromises = promises.flat();
+        const results = await Promise.all(flattenedPromises);
+
+        return results.filter(result => result !== null);
+    }
+};