113 lines
2.5 KiB
TypeScript
113 lines
2.5 KiB
TypeScript
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import * as fs from 'fs';
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import * as URL from 'url';
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import * as tmp from 'tmp';
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import * as Koa from 'koa';
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import * as request from 'request';
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import * as fileType from 'file-type';
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import * as isSvg from 'is-svg';
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import { serverLogger } from '..';
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import config from '../../config';
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import { IImage, ConvertToPng } from '../../services/drive/image-processor';
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export async function proxyMedia(ctx: Koa.BaseContext) {
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const url = 'url' in ctx.query ? ctx.query.url : 'https://' + ctx.params.url;
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// Create temp file
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const [path, cleanup] = await new Promise<[string, any]>((res, rej) => {
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tmp.file((e, path, fd, cleanup) => {
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if (e) return rej(e);
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res([path, cleanup]);
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});
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});
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try {
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await fetch(url, path);
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const [type, ext] = await detectMine(path);
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let image: IImage;
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if ('static' in ctx.query && ['image/png', 'image/gif'].includes(type)) {
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image = await ConvertToPng(path, 498, 280);
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} else {
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image = {
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data: fs.readFileSync(path),
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ext,
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type,
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};
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}
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ctx.set('Content-Type', type);
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ctx.set('Cache-Control', 'max-age=31536000, immutable');
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ctx.body = image.data;
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} catch (e) {
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serverLogger.error(e);
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ctx.status = 500;
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} finally {
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cleanup();
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}
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}
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async function fetch(url: string, path: string) {
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await new Promise((res, rej) => {
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const writable = fs.createWriteStream(path);
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writable.on('finish', () => {
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res();
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});
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writable.on('error', error => {
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rej(error);
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});
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const requestUrl = URL.parse(url).pathname.match(/[^\u0021-\u00ff]/) ? encodeURI(url) : url;
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const req = request({
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url: requestUrl,
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proxy: config.proxy,
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timeout: 10 * 1000,
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headers: {
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'User-Agent': config.user_agent
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}
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});
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req.pipe(writable);
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req.on('response', response => {
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if (response.statusCode !== 200) {
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writable.close();
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rej(response.statusCode);
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}
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});
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req.on('error', error => {
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writable.close();
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rej(error);
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});
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});
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}
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async function detectMine(path: string) {
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return new Promise<[string, string]>((res, rej) => {
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const readable = fs.createReadStream(path);
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readable
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.on('error', rej)
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.once('data', (buffer: Buffer) => {
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readable.destroy();
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const type = fileType(buffer);
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if (type) {
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res([type.mime, type.ext]);
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} else if (isSvg(buffer)) {
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res(['image/svg+xml', 'svg']);
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} else {
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// 種類が同定できなかったら application/octet-stream にする
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res(['application/octet-stream', null]);
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}
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})
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.on('end', () => {
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// maybe 0 bytes
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res(['application/octet-stream', null]);
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});
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});
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}
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