AWS API Gateway as an S3 proxy: IAM role and path parameters

Guides I followed:

• Tutorial: Create a REST API as an Amazon S3 proxy in API Gateway - Amazon API Gateway
• Using REST API to upload files to the S3 bucket - BlueGrid

IAM role

Edit the trust relationship

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "s3.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    },
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "apigateway.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

API Gateway

Next, go to API Gateway and create a REST API. Create the {folder} and {item} resources, then create a GET method:

Here tanldttestingapigateway is the S3 bucket name.

On /{folder}/{item} → GET → Method Execution, add the URL path parameters.

Test

Create the folder Test1 and upload a text file for testing.