og-image/card.ts at dot-dom · dominicchapman/og-image

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import { IncomingMessage, ServerResponse } from 'http';

import { parseRequest } from './parser';

import { getScreenshot } from './chromium';

import { getHtml } from './template';

import { writeTempFile, pathToFileURL } from './file';

async function handler(req: IncomingMessage, res: ServerResponse) {

try {

const { type, text, fontWeight, fontSize, images } = parseRequest(req);

const html = getHtml(text, fontWeight, fontSize, images);

const filePath = await writeTempFile(text, html);

const fileUrl = pathToFileURL(filePath);

const file = await getScreenshot(fileUrl, type);

res.statusCode = 200;

res.setHeader('Content-Type', `image/${type}`);

res.setHeader('Cache-Control', `public, immutable, no-transform, max-age=31536000`);

res.end(file);

} catch (e) {

res.statusCode = 500;

res.setHeader('Content-Type', 'text/html');

res.end('<h1>Server Error</h1><p>Sorry, there was a problem</p>');

console.error(e.message);

}

};

if (!process.env.NOW_REGION) {

const { createServer } = require('http');

const PORT = process.env.PORT || 3000;

const listen = () => console.log(`Listening on ${PORT}...`);

createServer(handler).listen(PORT, listen);

}

module.exports = handler;