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package awsrulesfn
import (
"net"
"strings"
smithyhttp "github.com/aws/smithy-go/transport/http"
)
// IsVirtualHostableS3Bucket returns if the input is a DNS compatible bucket
// name and can be used with Amazon S3 virtual hosted style addressing. Similar
// to [rulesfn.IsValidHostLabel] with the added restriction that the length of label
// must be [3:63] characters long, all lowercase, and not formatted as an IP
// address.
func IsVirtualHostableS3Bucket(input string, allowSubDomains bool) bool {
// input should not be formatted as an IP address
// NOTE: this will technically trip up on IPv6 hosts with zone IDs, but
// validation further down will catch that anyway (it's guaranteed to have
// unfriendly characters % and : if that's the case)
if net.ParseIP(input) != nil {
return false
}
var labels []string
if allowSubDomains {
labels = strings.Split(input, ".")
} else {
labels = []string{input}
}
for _, label := range labels {
// validate special length constraints
if l := len(label); l < 3 || l > 63 {
return false
}
// Validate no capital letters
for _, r := range label {
if r >= 'A' && r <= 'Z' {
return false
}
}
// Validate valid host label
if !smithyhttp.ValidHostLabel(label) {
return false
}
}
return true
}
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