AWS S3 user folder policy

s3-aws-policy

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": { "Federated": "cognito-identity.amazonaws.com" },
      "Action": ["s3:ListBucket"],
      "Resource": ["arn:aws:s3:::BUCKET_NAME"],
      "Condition": {"StringLike": {"s3:prefix": ["${cognito-identity.amazonaws.com:sub}/*"]}}
    },
    {
      "Effect": "Allow",
      "Principal": { "Federated": "cognito-identity.amazonaws.com" },
      "Action": [
        "s3:GetObject",
        "s3:PutObject",
        "s3:DeleteObject"
      ],
      "Resource": ["arn:aws:s3:::BUCKET_NAME/${cognito-identity.amazonaws.com:sub}/*"]
    }
  ]
}