Minio

Read only

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "*"
                ]
            },
            "Action": [
                "s3:GetBucketLocation",
                "s3:ListBucket"
            ],
            "Resource": [
                "arn:aws:s3:::memo"
            ]
        },
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": [
                    "*"
                ]
            },
            "Action": [
                "s3:GetObject"
            ],
            "Resource": [
                "arn:aws:s3:::memo/*"
            ]
        }
    ]
}

Note: you can reproduce it through web-ui, first set the bucket as public, then go to Access Rules, remove readwrite, and add readonly on prefix /.

• source 1
• source 2