Fix edge-function

posts/2023-10-16-the-stack-part-3.md

@@ -1601,7 +1601,7 @@ export class Stack extends cdk.Stack {
             ? [
                 {
                   functionVersion: rewriteUrl.currentVersion,
-                  eventType: cloudfront.LambdaEdgeEventType.VIEWER_REQUEST,
+                  eventType: cloudfront.LambdaEdgeEventType.ORIGIN_REQUEST,
                 },
               ]
             : undefined,
@@ -1661,20 +1661,19 @@ export class Stack extends cdk.Stack {
 And our Lambda@Edge function to rewrite urls is defined in `edge-functions/rewrite-urls.ts`:
 
 ```typescript
-function handler(event) {
-  var request = event.request;
-  var uri = request.uri;
+exports.handler = (event, _, callback) => {
+  let request = event.Records[0].cf.request;
 
   // Check whether the URI is missing a file name.
-  if (uri.endsWith("/")) {
+  if (request.uri.endsWith("/")) {
     request.uri += "index.html";
-  } else if (!uri.includes(".")) {
+  } else if (!request.uri.includes(".")) {
     // Check whether the URI is missing a file extension.
     request.uri += "/index.html";
   }
 
-  return request;
-}
+  return callback(null, request);
+};
 ```