Modularized Sub-Store

backend/src/utils/download.js

@@ -0,0 +1,29 @@
+const { HTTP } = require('./open-api');
+
+const cache = new Map();
+
+async function download(url, userAgent = 'Quantumult%20X') {
+	const id = userAgent + url;
+	if (cache.has(id)) {
+		return cache.get(id);
+	}
+
+	const $http = HTTP({
+		headers: {
+			'User-Agent': userAgent
+		}
+	});
+
+	const result = new Promise((resolve, reject) => {
+		$http.get(url).then((resp) => {
+			const body = resp.body;
+			if (body.replace(/\s/g, '').length === 0) reject(new Error('订阅内容为空！'));
+			else resolve(body);
+		});
+	});
+
+	cache[id] = result;
+	return result;
+}
+
+module.exports = download;