Greengrass V2 Custom Component having S3client | Java

Question

we have requirement to download/upload files in S3 using GreengrassV2 Custom component. Can anyone help how we can get the S3client Object with provided credential. We have created thing with role-alias which has S3 Get/Put access. As GreengrassV2 thing has already access policy, How can we create S3 Object? How the credential exchange in custom-component in java.

Chris Azer · Answer

Hi there! So one thing you will need to do is deploy the Token exchange service component. The token exchange service component ([aws.greengrass.TokenExchangeService](https://docs.aws.amazon.com/greengrass/v2/developerguide/token-exchange-service-component.html)) provides AWS credentials that you can use to interact with AWS services in your custom components.

With that being said, I would also considering using the [Greengrass Stream Manager component](https://docs.aws.amazon.com/greengrass/v2/developerguide/manage-data-streams.html)? It contains an S3 destination option and handles all that data transfer logic for you. Has a bunch of features, but you simply just add the file to the S3 stream and StreamManager will upload the object to S3 for you.

[Greengrass StreamManager Component](https://docs.aws.amazon.com/greengrass/v2/developerguide/stream-manager-component.html)

[Sample Code](https://docs.aws.amazon.com/greengrass/v2/developerguide/stream-export-configurations.html#export-to-s3) in Java to export objects to S3 using Stream Manager

Hope this helps!

Greengrass V2 Custom Component having S3client | Java

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