115 lines
3.2 KiB
TypeScript
115 lines
3.2 KiB
TypeScript
import { polyfill } from '@astrojs/webapi';
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import type { Handler } from '@netlify/functions';
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import { SSRManifest } from 'astro';
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import { App } from 'astro/app';
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polyfill(globalThis, {
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exclude: 'window document',
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});
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export interface Args {
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binaryMediaTypes?: string[];
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}
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function parseContentType(header?: string) {
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return header?.split(';')[0] ?? '';
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}
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export const createExports = (manifest: SSRManifest, args: Args) => {
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const app = new App(manifest);
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const binaryMediaTypes = args.binaryMediaTypes ?? [];
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const knownBinaryMediaTypes = new Set([
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'audio/3gpp',
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'audio/3gpp2',
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'audio/aac',
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'audio/midi',
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'audio/mpeg',
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'audio/ogg',
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'audio/opus',
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'audio/wav',
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'audio/webm',
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'audio/x-midi',
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'image/avif',
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'image/bmp',
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'image/gif',
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'image/vnd.microsoft.icon',
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'image/jpeg',
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'image/png',
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'image/svg+xml',
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'image/tiff',
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'image/webp',
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'video/3gpp',
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'video/3gpp2',
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'video/mp2t',
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'video/mp4',
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'video/mpeg',
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'video/ogg',
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'video/x-msvideo',
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'video/webm',
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...binaryMediaTypes,
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]);
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const handler: Handler = async (event) => {
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const { httpMethod, headers, rawUrl, body: requestBody, isBase64Encoded } = event;
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const init: RequestInit = {
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method: httpMethod,
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headers: new Headers(headers as any),
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};
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// Attach the event body the the request, with proper encoding.
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if (httpMethod !== 'GET' && httpMethod !== 'HEAD') {
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const encoding = isBase64Encoded ? 'base64' : 'utf-8';
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init.body =
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typeof requestBody === 'string' ? Buffer.from(requestBody, encoding) : requestBody;
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}
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const request = new Request(rawUrl, init);
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if (!app.match(request)) {
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return {
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statusCode: 404,
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body: 'Not found',
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};
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}
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const response: Response = await app.render(request);
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const responseHeaders = Object.fromEntries(response.headers.entries());
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const responseContentType = parseContentType(responseHeaders['content-type']);
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const responseIsBase64Encoded = knownBinaryMediaTypes.has(responseContentType);
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const responseBody = responseIsBase64Encoded
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? Buffer.from(await response.text(), 'binary').toString('base64')
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: await response.text();
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const fnResponse: any = {
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statusCode: response.status,
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headers: responseHeaders,
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body: responseBody,
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isBase64Encoded: responseIsBase64Encoded,
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};
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// Special-case set-cookie which has to be set an different way :/
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// The fetch API does not have a way to get multiples of a single header, but instead concatenates
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// them. There are non-standard ways to do it, and node-fetch gives us headers.raw()
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// See https://github.com/whatwg/fetch/issues/973 for discussion
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if (response.headers.has('set-cookie') && 'raw' in response.headers) {
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// Node fetch allows you to get the raw headers, which includes multiples of the same type.
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// This is needed because Set-Cookie *must* be called for each cookie, and can't be
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// concatenated together.
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type HeadersWithRaw = Headers & {
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raw: () => Record<string, string[]>;
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};
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const rawPacked = (response.headers as HeadersWithRaw).raw();
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if ('set-cookie' in rawPacked) {
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fnResponse.multiValueHeaders = {
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'set-cookie': rawPacked['set-cookie'],
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};
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}
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}
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return fnResponse;
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};
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return { handler };
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};
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