https://docs.amazonaws.cn/en_us/AmazonS3/latest/dev/example-bucket-policies.html
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "s3:GetObject"
      ],
      "Effect": "Allow",
      "Principal": {
        "AWS": [
          "*"
        ]
      },
      "Resource": [
        "arn:aws:s3:::<BUCKET_NAME>/*"
      ],
      "Sid": ""
    }
  ]
}