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import { polyfill } from '@astrojs/webapi';
import { builder, type Handler } from '@netlify/functions';
import type { SSRManifest } from 'astro';
import { App } from 'astro/app';
import { ASTRO_LOCALS_HEADER } from './integration-functions.js';
polyfill(globalThis, {
exclude: 'window document',
});
export interface Args {
builders?: boolean;
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 builders = args.builders ?? false;
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 myHandler: 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 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);
let locals = {};
if (request.headers.has(ASTRO_LOCALS_HEADER)) {
let localsAsString = request.headers.get(ASTRO_LOCALS_HEADER);
if (localsAsString) {
locals = JSON.parse(localsAsString);
}
}
const response: Response = await app.render(request, routeData, locals);
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,
};
const cookies = response.headers.get('set-cookie');
if (cookies) {
fnResponse.multiValueHeaders = {
'set-cookie': Array.isArray(cookies) ? cookies : splitCookiesString(cookies),
};
}
// Apply cookies set via Astro.cookies.set/delete
if (app.setCookieHeaders) {
const setCookieHeaders = Array.from(app.setCookieHeaders(response));
fnResponse.multiValueHeaders = fnResponse.multiValueHeaders || {};
if (!fnResponse.multiValueHeaders['set-cookie']) {
fnResponse.multiValueHeaders['set-cookie'] = [];
}
fnResponse.multiValueHeaders['set-cookie'].push(...setCookieHeaders);
}
return fnResponse;
};
const handler = builders ? builder(myHandler) : myHandler;
return { handler };
};
/*
From: https://github.com/nfriedly/set-cookie-parser/blob/5cae030d8ef0f80eec58459e3583d43a07b984cb/lib/set-cookie.js#L144
Set-Cookie header field-values are sometimes comma joined in one string. This splits them without choking on commas
that are within a single set-cookie field-value, such as in the Expires portion.
This is uncommon, but explicitly allowed - see https://tools.ietf.org/html/rfc2616#section-4.2
Node.js does this for every header *except* set-cookie - see https://github.com/nodejs/node/blob/d5e363b77ebaf1caf67cd7528224b651c86815c1/lib/_http_incoming.js#L128
React Native's fetch does this for *every* header, including set-cookie.
Based on: https://github.com/google/j2objc/commit/16820fdbc8f76ca0c33472810ce0cb03d20efe25
Credits to: https://github.com/tomball for original and https://github.com/chrusart for JavaScript implementation
*/
function splitCookiesString(cookiesString: string): string[] {
if (Array.isArray(cookiesString)) {
return cookiesString;
}
if (typeof cookiesString !== 'string') {
return [];
}
let cookiesStrings = [];
let pos = 0;
let start;
let ch;
let lastComma;
let nextStart;
let cookiesSeparatorFound;
function skipWhitespace() {
while (pos < cookiesString.length && /\s/.test(cookiesString.charAt(pos))) {
pos += 1;
}
return pos < cookiesString.length;
}
function notSpecialChar() {
ch = cookiesString.charAt(pos);
return ch !== '=' && ch !== ';' && ch !== ',';
}
while (pos < cookiesString.length) {
start = pos;
cookiesSeparatorFound = false;
while (skipWhitespace()) {
ch = cookiesString.charAt(pos);
if (ch === ',') {
// ',' is a cookie separator if we have later first '=', not ';' or ','
lastComma = pos;
pos += 1;
skipWhitespace();
nextStart = pos;
while (pos < cookiesString.length && notSpecialChar()) {
pos += 1;
}
// currently special character
if (pos < cookiesString.length && cookiesString.charAt(pos) === '=') {
// we found cookies separator
cookiesSeparatorFound = true;
// pos is inside the next cookie, so back up and return it.
pos = nextStart;
cookiesStrings.push(cookiesString.substring(start, lastComma));
start = pos;
} else {
// in param ',' or param separator ';',
// we continue from that comma
pos = lastComma + 1;
}
} else {
pos += 1;
}
}
if (!cookiesSeparatorFound || pos >= cookiesString.length) {
cookiesStrings.push(cookiesString.substring(start, cookiesString.length));
}
}
return cookiesStrings;
}
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