feat: custom s3 endpoint url for 'plugin-node'

[dtbuchholz]

Relates to

https://github.com/elizaOS/eliza/issues/2174

Risks

Low. This affects only the plugin-node, and it changes logic in a way that is backward compatible.

Background

What does this PR do?

This changes the plugin-node to, optionally, use a custom AWS_S3_ENDPOINT. If this value is not set, the existing behavior is used, which explicitly calls the official AWS S3 URL. If the value is set (e.g., http://localhost:8014), it instead uses this custom URL when reading/writing data. Closes https://github.com/elizaOS/eliza/issues/2174.

What kind of change is this?

Feature; improves the S3 plugin functionality.

Why are we doing this? Any context or related work?

Eliza should make it so that AWS isn't the only S3 provider. Right now, it's an enshrined plugin. If we merge this PR, anyone that builds an S3-compatible tool can use the plugin; it becomes more flexible.

For reference, I'm building a web3 native object storage layer, which has S3 compatability—called Basin: https://basin.textile.io. We have an S3 adapter that works with MinIO, boto3, etc. I tested this plugin against our adapter, and everything worked as expected (more on this below).

Documentation changes needed?

• Updated the plugin-node README to mention this variable
• Added to the .env.example file

Testing

Where should a reviewer start?

If you'd like to test this flow, you'll need to use some local S3 compatible server. A popular one is MinIO. Once you have the server running, it should log the local port. You can then set the .env variable AWS_S3_ENDPOINT to this value (e.g., http://localhost:8014), and then call uploadFile.

Detailed testing steps

I tested this against our S3 adapter with both raw and resigned URLs. For example:

const s3 = runtime?.getService(ServiceType.AWS_S3) as IAwsS3Service;
const tempFile = path.join(os.tmpdir(), "test.txt");
writeFileSync(tempFile, "test content");
const fileContent = readFileSync(tempFile, "utf8");
elizaLogger.log("File content:", fileContent);
const { success, url, error } = await s3.uploadFile(
    tempFile,
    "",
    true,
    3600
);
console.log(url);
// Default `url` value: `http://localhost:8014/eliza/images/1736652765063-test.txt`
// If presigned: `http://localhost:8014/eliza/images/1736652765063-test.txt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKEXAMPLES3S%2F20250112%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20250112T033246Z&X-Amz-Expires=3600&X-Amz-Signature=ebd5aaaf39c272ff22017289327851512597cdc5e9549156cd1adee3426135de&X-Amz-SignedHeaders=host&x-id=GetObject`

If AWS_S3_ENDPOINT is not set, then it uses the normal S3 format.

Discord username

dtb_