Error in toEndpointV1 method

[Nefcanto]

I came here because of this bug:

 2026-07-22T14:17:59.244Z Command {
     "Bucket": "someProject",
     "Key": "post/205ef9cd-54ac-4cdf-b400-d985d6315a02.webp",
     "ContentType": "image/webp",
     "ACL": "public-read"
 }
 2026-07-22T14:17:59.269Z Upload failed: post/205ef9cd-54ac-4cdf-b400-d985d6315a02.webp
 2026-07-22T14:17:59.269Z TypeError: endpoint.headers[name].join is not a function
     at toEndpointV1 (/home/someUser/someProject/adminApi/node_modules/@smithy/core/dist-cjs/submodules/transport/index.js:164:85)
     at Object.endpoint (/home/someUser/someProject/adminApi/node_modules/@smithy/core/dist-cjs/submodules/schema/index.js:85:23)
     at S3RestXmlProtocol.serializeRequest (/home/someUser/someProject/adminApi/node_modules/@smithy/core/dist-cjs/submodules/protocols/index.js:189:40)
     at S3RestXmlProtocol.serializeRequest (/home/someUser/someProject/adminApi/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:1821:37)
     at S3RestXmlProtocol.serializeRequest (/home/someUser/someProject/adminApi/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:495:37)
     at /home/someUser/someProject/adminApi/node_modules/@smithy/core/dist-cjs/submodules/schema/index.js:87:43
     at /home/someUser/someProject/adminApi/node_modules/@aws-sdk/checksums/dist-cjs/submodules/flexible-checksums/index.js:293:12
     at async /home/someUser/someProject/adminApi/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:62:28
     at async /home/someUser/someProject/adminApi/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:89:20
     at async /home/someUser/someProject/adminApi/node_modules/@aws-sdk/core/dist-cjs/submodules/client/index.js:125:26
     at async Object.upload (file:///home/someUser/someProject/adminApi/node_modules/core/cloud/aws/storage.js:75:13)
     at async Object.uploadImage (file:///home/someUser/someProject/adminApi/node_modules/core/data/storage/storage.js:111:9)
     at async uploadImage (file:///home/someUser/someProject/adminApi/node_modules/media/business/image/upload.js:20:5)
     at async uploadDefaultOnPost (file:///home/someUser/someProject/adminApi/node_modules/media/business/image/upload.js:54:5)
     at async handleAction (file:///home/someUser/someProject/adminApi/node_modules/core/api/actionHandler.js:139:18)
     at async file:///home/someUser/someProject/adminApi/node_modules/core/api/typeRoute.js:27:26
 2026-07-22T14:17:59.271Z TypeError: endpoint.headers[name].join is not a function
     at toEndpointV1 (/home/someUser/someProject/adminApi/node_modules/@smithy/core/dist-cjs/submodules/transport/index.js:164:85)
     at Object.endpoint (/home/someUser/someProject/adminApi/node_modules/@smithy/core/dist-cjs/submodules/schema/index.js:85:23)
     at S3RestXmlProtocol.serializeRequest (/home/someUser/someProject/adminApi/node_modules/@smithy/core/dist-cjs/submodules/protocols/index.js:189:40)
     at S3RestXmlProtocol.serializeRequest (/home/someUser/someProject/adminApi/node_modules/@aws-sdk/core/dist-cjs/submodules/protocols/index.js:1821:37)
     at S3RestXmlProtocol.serializeRequest (/home/someUser/someProject/adminApi/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:495:37)
     at /home/someUser/someProject/adminApi/node_modules/@smithy/core/dist-cjs/submodules/schema/index.js:87:43
     at /home/someUser/someProject/adminApi/node_modules/@aws-sdk/checksums/dist-cjs/submodules/flexible-checksums/index.js:293:12
     at async /home/someUser/someProject/adminApi/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:62:28
     at async /home/someUser/someProject/adminApi/node_modules/@aws-sdk/middleware-sdk-s3/dist-cjs/submodules/s3/index.js:89:20
     at async /home/someUser/someProject/adminApi/node_modules/@aws-sdk/core/dist-cjs/submodules/client/index.js:125:26
     at async Object.upload (file:///home/someUser/someProject/adminApi/node_modules/core/cloud/aws/storage.js:75:13)
     at async Object.uploadImage (file:///home/someUser/someProject/adminApi/node_modules/core/data/storage/storage.js:111:9)
     at async uploadImage (file:///home/someUser/someProject/adminApi/node_modules/media/business/image/upload.js:20:5)
     at async uploadDefaultOnPost (file:///home/someUser/someProject/adminApi/node_modules/media/business/image/upload.js:54:5)
     at async handleAction (file:///home/someUser/someProject/adminApi/node_modules/core/api/actionHandler.js:139:18)
     at async file:///home/someUser/someProject/adminApi/node_modules/core/api/typeRoute.js:27:26

Here is the method that causes this bug:

const toEndpointV1 = (endpoint) => {
    console.log(endpoint)
    if (typeof endpoint === "object") {
        if ("url" in endpoint) {
            const v1Endpoint = parseUrl(endpoint.url);
            if (endpoint.headers) {
                v1Endpoint.headers = {};
                for (const name in endpoint.headers) {
                    console.log(name)
                    v1Endpoint.headers[name.toLowerCase()] = endpoint.headers[name].join(", ");
                }
            }
            return v1Endpoint;
        }
        return endpoint;
    }
    return parseUrl(endpoint);
};

Please note that console.log lines are mine. And here is the endpoint:

{
  url: URL {
    href: 'https://s3.ir-thr-at1.arvanstorage.ir/jzp',
    origin: 'https://s3.ir-thr-at1.arvanstorage.ir',
    protocol: 'https:',
    username: '',
    password: '',
    host: 's3.ir-thr-at1.arvanstorage.ir',
    hostname: 's3.ir-thr-at1.arvanstorage.ir',
    port: '',
    pathname: '/jzp',
    search: '',
    searchParams: URLSearchParams {},
    hash: ''
  },
  properties: { authSchemes: [ [Object] ] },
  headers: {}
}

And here is the name of the first property that causes this error:

sortByKeys

This is a custom property that we have added to all objects in our codebase:

Object.prototype.sortByKeys = function () {
    const sortedKeys = Object.keys(this).sort()

    const sortedObject = {}
    for (const key of sortedKeys) {
        sortedObject[key] = this[key]
    }
    return sortedObject
}

So, I think you should make your property-transferring logic limited to the object itself and not prototypically inherited properties:

for (const name in endpoint.headers) {
    if (!Object.hasOwn(endpoint.headers, name)) continue

    v1Endpoint.headers[name.toLowerCase()] = endpoint.headers[name].join(", ")
}