Allow lambda to access particular s3 bucket in serverless config

Question

How can I allow specific lambda to access to a particular s3 bucket in the serverless.yml?

For example, I am porting file upload functionality to lambda by using serverless. To upload a file to a particular s3 bucket, I need to allow lambda to access to that s3 bucket. How can I do this in the serverless.yml?

Answer 1

From Serverless Framework - AWS Lambda Guide - IAM:

To add specific rights to this service-wide Role, define statements in provider.iamRoleStatements which will be merged into the generated policy.

service: new-service

provider:
  name: aws
  iamRoleStatements:
    -  Effect: "Allow"
       Action:
         - "s3:PutObject"
       Resource:
         Fn::Join:
           - ""
           - - "arn:aws:s3:::"
             - Ref: ServerlessDeploymentBucket