jormungandr-bite/packages/backend/src/server/proxy/proxy-media.ts

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import * as fs from 'fs';
import * as Koa from 'koa';
import { serverLogger } from '../index';
import { IImage, convertToPng, convertToJpeg } from '@/services/drive/image-processor';
import { createTemp } from '@/misc/create-temp';
import { downloadUrl } from '@/misc/download-url';
import { detectType } from '@/misc/get-file-info';
import { StatusError } from '@/misc/fetch';
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export async function proxyMedia(ctx: Koa.Context) {
const url = 'url' in ctx.query ? ctx.query.url : 'https://' + ctx.params.url;
// Create temp file
const [path, cleanup] = await createTemp();
try {
await downloadUrl(url, path);
const { mime, ext } = await detectType(path);
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if (!mime.startsWith('image/')) throw 403;
let image: IImage;
if ('static' in ctx.query && ['image/png', 'image/gif', 'image/apng', 'image/vnd.mozilla.apng', 'image/webp'].includes(mime)) {
image = await convertToPng(path, 498, 280);
} else if ('preview' in ctx.query && ['image/jpeg', 'image/png', 'image/gif', 'image/apng', 'image/vnd.mozilla.apng'].includes(mime)) {
image = await convertToJpeg(path, 200, 200);
} else {
image = {
data: fs.readFileSync(path),
ext,
type: mime,
};
}
ctx.set('Content-Type', image.type);
ctx.set('Cache-Control', 'max-age=31536000, immutable');
ctx.body = image.data;
} catch (e) {
serverLogger.error(`${e}`);
if (e instanceof StatusError && e.isClientError) {
ctx.status = e.statusCode;
} else {
ctx.status = 500;
}
} finally {
cleanup();
}
}