Feature: Support role-based authentication for AWS (#2470)

* Storage, DynamoDBChatMemory - Make AWS credentials optional to support role-based authentication

* Lint fix

packages/components/src/storageUtils.ts

@@ -1,6 +1,13 @@
 import path from 'path'
 import fs from 'fs'
-import { DeleteObjectsCommand, GetObjectCommand, ListObjectsV2Command, PutObjectCommand, S3Client } from '@aws-sdk/client-s3'
+import {
+    DeleteObjectsCommand,
+    GetObjectCommand,
+    ListObjectsV2Command,
+    PutObjectCommand,
+    S3Client,
+    S3ClientConfig
+} from '@aws-sdk/client-s3'
 import { Readable } from 'node:stream'
 import { getUserHome } from './utils'
 
@@ -311,14 +318,20 @@ export const getS3Config = () => {
     const secretAccessKey = process.env.S3_STORAGE_SECRET_ACCESS_KEY
     const region = process.env.S3_STORAGE_REGION
     const Bucket = process.env.S3_STORAGE_BUCKET_NAME
-    if (!accessKeyId || !secretAccessKey || !region || !Bucket) {
+    if (!region || !Bucket) {
         throw new Error('S3 storage configuration is missing')
     }
-    const s3Client = new S3Client({
-        credentials: {
+
+    let credentials: S3ClientConfig['credentials'] | undefined
+    if (accessKeyId && secretAccessKey) {
+        credentials = {
             accessKeyId,
             secretAccessKey
-        },
+        }
+    }
+
+    const s3Client = new S3Client({
+        credentials,
         region
     })
     return { s3Client, Bucket }