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