Fix #4546 (#4548)

* Refactor download

* emoji type

src/server/proxy/proxy-media.ts

@@ -1,27 +1,19 @@
 import * as fs from 'fs';
-import * as URL from 'url';
-import * as tmp from 'tmp';
 import * as Koa from 'koa';
-import * as request from 'request';
-import fileType from 'file-type';
 import { serverLogger } from '..';
-import config from '../../config';
 import { IImage, ConvertToPng, ConvertToJpeg } from '../../services/drive/image-processor';
-import checkSvg from '../../misc/check-svg';
+import { createTemp } from '../../misc/create-temp';
+import { downloadUrl } from '../../misc/donwload-url';
+import { detectMine } from '../../misc/detect-mine';
 
 export async function proxyMedia(ctx: Koa.BaseContext) {
 	const url = 'url' in ctx.query ? ctx.query.url : 'https://' + ctx.params.url;
 
 	// Create temp file
-	const [path, cleanup] = await new Promise<[string, any]>((res, rej) => {
-		tmp.file((e, path, fd, cleanup) => {
-			if (e) return rej(e);
-			res([path, cleanup]);
-		});
-	});
+	const [path, cleanup] = await createTemp();
 
 	try {
-		await fetch(url, path);
+		await downloadUrl(url, path);
 
 		const [type, ext] = await detectMine(path);
 
@@ -54,70 +46,3 @@ export async function proxyMedia(ctx: Koa.BaseContext) {
 		cleanup();
 	}
 }
-
-async function fetch(url: string, path: string) {
-	await new Promise((res, rej) => {
-		const writable = fs.createWriteStream(path);
-
-		writable.on('finish', () => {
-			res();
-		});
-
-		writable.on('error', error => {
-			rej(error);
-		});
-
-		const requestUrl = URL.parse(url).pathname.match(/[^\u0021-\u00ff]/) ? encodeURI(url) : url;
-
-		const req = request({
-			url: requestUrl,
-			proxy: config.proxy,
-			timeout: 10 * 1000,
-			headers: {
-				'User-Agent': config.userAgent
-			}
-		});
-
-		req.pipe(writable);
-
-		req.on('response', response => {
-			if (response.statusCode !== 200) {
-				writable.close();
-				rej(response.statusCode);
-			}
-		});
-
-		req.on('error', error => {
-			writable.close();
-			rej(error);
-		});
-	});
-}
-
-async function detectMine(path: string) {
-	return new Promise<[string, string]>((res, rej) => {
-		const readable = fs.createReadStream(path);
-		readable
-			.on('error', rej)
-			.once('data', (buffer: Buffer) => {
-				readable.destroy();
-				const type = fileType(buffer);
-				if (type) {
-					if (type.mime == 'application/xml' && checkSvg(path)) {
-						res(['image/svg+xml', 'svg']);
-					} else {
-						res([type.mime, type.ext]);
-					}
-				} else if (checkSvg(path)) {
-					res(['image/svg+xml', 'svg']);
-				} else {
-					// 種類が同定できなかったら application/octet-stream にする
-					res(['application/octet-stream', null]);
-				}
-			})
-			.on('end', () => {
-				// maybe 0 bytes
-				res(['application/octet-stream', null]);
-			});
-	});
-}