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

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import { IncomingMessage } from 'http';

import { parse } from 'url';

interface ParsedRequest {

type: ScreenshotType;

text: string;

fontWeight: FontWeight;

fontSize: string;

images: string[];

};

export function parseRequest(req: IncomingMessage) {

console.log('HTTP ' + req.url);

const { pathname = '/', query = {} } = parse(req.url || '', true);

const { fontWeight, fontSize, images } = query;

if (Array.isArray(fontWeight)) {

throw new Error('Expected a single fontWeight');

}

if (Array.isArray(fontSize)) {

throw new Error('Expected a single fontSize');

}

const arr = pathname.slice(1).split('.');

const type = arr.pop();

const text = arr.join('.');

const parsedRequest: ParsedRequest = {

type: type as ScreenshotType,

text: decodeURIComponent(text),

fontWeight: fontWeight as FontWeight,

fontSize: fontSize || '75px',

images: Array.isArray(images) && images.length > 0

? images

: ['https://assets.zeit.co/image/upload/front/assets/design/now-black.svg'],

};

return parsedRequest;

}