Рефакторинг

server/core/FileDownloader.js

@@ -0,0 +1,34 @@
+const got = require('got');
+
+class FileDownloader {
+    constructor() {
+    }
+
+    async load(url, callback) {
+        const maxDownloadSize = 10*1024*1024;
+
+        let estSize = 100000;
+        const request = got(url).on('downloadProgress', progress => {
+            if (progress.transferred > maxDownloadSize) {
+                request.cancel();
+            }
+            const prog = Math.round(progress.transferred/estSize*100);
+            if (callback)
+                callback(prog);
+            if (prog > 100)
+                estSize *= 1.5;
+        });
+
+
+        try {
+            return (await request).body;
+        } catch (error) {
+            if (request.isCanceled) {
+                throw new Error('file too big')
+            }
+            throw error;
+        }
+    }
+}
+
+module.exports = FileDownloader;