fix: Fix error in Lambda@Edge by replacing return with callback (#116)

plugins/aws/lambda/index.ts

@@ -2,7 +2,7 @@ import type { Bundle } from "@hot-updater/core";
 import { filterCompatibleAppVersions, getUpdateInfo } from "@hot-updater/js";
 import type { CloudFrontRequestHandler } from "aws-lambda";
 
-export const handler: CloudFrontRequestHandler = async (event) => {
+export const handler: CloudFrontRequestHandler = async (event, context, callback) => {
   const request = event.Records[0].cf.request;
   const headers = request.headers;
 
@@ -12,17 +12,18 @@ export const handler: CloudFrontRequestHandler = async (event) => {
 
   const distributionDomain = headers["host"][0]?.value;
 
-  const bundleId = headers["x-bundle-id"][0]?.value as string;
-  const appPlatform = headers["x-app-platform"][0]?.value as "ios" | "android";
-  const appVersion = headers["x-app-version"][0]?.value as string;
+  const bundleId = headers["x-bundle-id"]?.[0]?.value as string;
+  const appPlatform = headers["x-app-platform"]?.[0]?.value as "ios" | "android";
+  const appVersion = headers["x-app-version"]?.[0]?.value as string;
 
   if (!bundleId || !appPlatform || !appVersion) {
-    return {
+    callback(null, {
       status: "400",
       body: JSON.stringify({
         error: "Missing bundleId, appPlatform, or appVersion",
       }),
-    };
+    });
+    return;
   }
 
   const targetAppVersionListUrl = `https://${distributionDomain}/${appPlatform}/target-app-versions.json`;
@@ -31,12 +32,13 @@ export const handler: CloudFrontRequestHandler = async (event) => {
     method: "GET",
   });
   if (!targetAppVersionListResponse.ok) {
-    return {
+    callback(null, {
       status: "404",
       body: JSON.stringify({
         error: `Failed to fetch ${appPlatform}/target-app-versions.json`,
       }),
-    };
+    });
+    return;
   }
 
   const targetAppVersionList =
@@ -48,13 +50,14 @@ export const handler: CloudFrontRequestHandler = async (event) => {
   );
 
   if (!matchingVersionList) {
-    return {
+    callback(null, {
       status: "200",
       headers: {
         "Content-Type": [{ key: "Content-Type", value: "application/json" }],
       },
       body: JSON.stringify(null),
-    };
+    });
+    return;
   }
 
   const results = await Promise.allSettled(
@@ -75,11 +78,11 @@ export const handler: CloudFrontRequestHandler = async (event) => {
     appVersion,
   });
 
-  return {
+  callback(null, {
     status: "200",
     headers: {
       "Content-Type": [{ key: "Content-Type", value: "application/json" }],
     },
     body: JSON.stringify(updateInfo),
-  };
+  });
 };