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// Amazon's application extension to TLVs for NLB VPC endpoint services
// https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-target-groups.html#proxy-protocol
package tlvparse
import (
"regexp"
"github.com/pires/go-proxyproto"
)
const (
// Amazon's extension
PP2_TYPE_AWS = 0xEA
PP2_SUBTYPE_AWS_VPCE_ID = 0x01
)
var vpceRe = regexp.MustCompile("^[A-Za-z0-9-]*$")
func IsAWSVPCEndpointID(tlv proxyproto.TLV) bool {
return tlv.Type == PP2_TYPE_AWS && len(tlv.Value) > 0 && tlv.Value[0] == PP2_SUBTYPE_AWS_VPCE_ID
}
func AWSVPCEndpointID(tlv proxyproto.TLV) (string, error) {
if !IsAWSVPCEndpointID(tlv) {
return "", proxyproto.ErrIncompatibleTLV
}
vpce := string(tlv.Value[1:])
if !vpceRe.MatchString(vpce) {
return "", proxyproto.ErrMalformedTLV
}
return vpce, nil
}
// FindAWSVPCEndpointID returns the first AWS VPC ID in the TLV if it exists and is well-formed.
func FindAWSVPCEndpointID(tlvs []proxyproto.TLV) string {
for _, tlv := range tlvs {
if vpc, err := AWSVPCEndpointID(tlv); err == nil && vpc != "" {
return vpc
}
}
return ""
}
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