Fix multi-value cookies

Author: James Bray

README.md

@@ -26,7 +26,7 @@ const config = {
 
 export default config;
 ```
-Copy `serverless.yml` from the root of this repo to the root of your project
+Copy `serverless.yml` from the root of this repo to the root of your project, make sure to change the service name in `serverless.yml`.
 
 After building your app run `sls deploy` to deploy code to AWS using the build tool [serverless](https://www.serverless.com/).
 

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@yarbsemaj/adapter-lambda",
-  "version": "0.9.2",
+  "version": "0.9.3",
   "license": "MIT",
   "description": "An adapter for [SvelteKit](https://kit.svelte.dev/) for AWS Lambda via Lambda Proxy and API Gateway.  [Serverless](https://www.serverless.com/) deployment.",
   "repository": {
@@ -32,6 +32,7 @@
     "esbuild": "0.10.1",
     "fs-extra": "^10.0.0",
     "serverless": "^3.0.0",
-    "serverless-s3-deploy": "^0.10.1"
+    "serverless-s3-deploy": "^0.10.1",
+    "set-cookie-parser": "^2.5.0"
   }
 }

package.json

@@ -8,7 +8,7 @@ plugins:
 
 provider:
   name: aws
-  runtime: nodejs14.x
+  runtime: nodejs16.x
   lambdaHashingVersion: 20201221
   region: us-east-1 #Lambda@Edge must be deployed in us-east-1
   stage: ${opt:stage, 'dev'}

serverless.yml

@@ -1,5 +1,6 @@
 import { Server } from '../index.js';
 import { manifest } from '../manifest.js';
+import { splitCookiesString } from 'set-cookie-parser';
 
 export async function handler(event) {
   const app = new Server(manifest);
@@ -8,10 +9,10 @@ export async function handler(event) {
   const encoding = isBase64Encoded ? 'base64' : headers['content-encoding'] || 'utf-8';
   const rawBody = typeof body === 'string' ? Buffer.from(body, encoding) : body;
 
-  if(cookies){
+  if (cookies) {
     headers['cookie'] = cookies.join('; ')
   }
-  
+
   let rawURL = `https://${requestContext.domainName}${rawPath}${rawQueryString ? `?${rawQueryString}` : ''}`
 
   //Render the app
@@ -25,18 +26,23 @@ export async function handler(event) {
   if (rendered) {
     const resp = {
       headers: {},
-      multiValueHeaders: {},
+      cookies: [],
       body: await rendered.text(),
       statusCode: rendered.status
     }
+
     for (let k of rendered.headers.keys()) {
       let header = rendered.headers.get(k)
 
-      //For multivalue headers, join them
-      if (header instanceof Array) {
-        header = header.join(',')
+      if (k == 'set-cookie') {
+        resp.cookies = resp.cookies.concat(splitCookiesString(header));
+      } else {
+        //For multivalue headers, join them
+        if (header instanceof Array) {
+          header = header.join(',')
+        }
+        resp.headers[k] = header
       }
-      resp.headers[k] = header
     }
     return resp
   }