アニメーションを自動再生しないオプション (#4131)

* Refactor

* settings

* Media Proxy

* Replace API response

src/server/proxy/proxy-media.ts

@@ -0,0 +1,113 @@
+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 * as fileType from 'file-type';
+import * as isSvg from 'is-svg';
+import { serverLogger } from '..';
+import config from '../../config';
+import { IImage, ConvertToPng } from '../../services/drive/image-processor';
+
+export async function proxyMedia(ctx: Koa.BaseContext) {
+	const url = 'url' in ctx.query ? ctx.query.url : 'https://' + ctx.params.url;
+	console.log(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]);
+		});
+	});
+
+	try {
+		await fetch(url, path);
+
+		const [type, ext] = await detectMine(path);
+
+		let image: IImage;
+
+		if ('static' in ctx.query && ['image/png', 'image/gif'].includes(type)) {
+			image = await ConvertToPng(path, 498, 280);
+		} else {
+			image = {
+				data: fs.readFileSync(path),
+				ext,
+				type,
+			};
+		}
+
+		ctx.set('Content-Type', type);
+		ctx.set('Cache-Control', 'max-age=31536000, immutable');
+		ctx.body = image.data;
+	} catch (e) {
+		serverLogger.error(e);
+		ctx.status = 500;
+	} finally {
+		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.user_agent
+			}
+		});
+
+		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) {
+					res([type.mime, type.ext]);
+				} else if (isSvg(buffer)) {
+					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]);
+			});
+	});
+}