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package cloudprovider
import (
"errors"
"fmt"
"strings"
)
const ProviderIDPrefix = "socialweb://"
var ErrBadProviderID = errors.New(
"cloudprovider: a provider ID is socialweb://<cluster>/<nodeName> -- one cluster name, one " +
"node name, separated by a slash -- and this is not one. The parser is strict because the " +
"string it rejects is what the apiserver records as a Node's identity: a malformed one " +
"that parsed would stamp every Node with a name no reader can take apart again")
func ProviderID(cluster, nodeName string) string {
return ProviderIDPrefix + cluster + "/" + nodeName
}
func ParseProviderID(s string) (cluster, nodeName string, err error) {
if !strings.HasPrefix(s, ProviderIDPrefix) {
return "", "", fmt.Errorf("%w: %q does not begin with %q", ErrBadProviderID, s, ProviderIDPrefix)
}
rest := strings.TrimPrefix(s, ProviderIDPrefix)
var ok bool
cluster, nodeName, ok = strings.Cut(rest, "/")
if !ok {
return "", "", fmt.Errorf(
"%w: %q names no node, because the cluster and the node are separated by exactly one "+
"slash", ErrBadProviderID, s)
}
if cluster == "" {
return "", "", fmt.Errorf("%w: %q has an empty cluster name", ErrBadProviderID, s)
}
if nodeName == "" {
return "", "", fmt.Errorf("%w: %q has an empty node name", ErrBadProviderID, s)
}
if !isASCII(cluster) || !isASCII(nodeName) {
return "", "", fmt.Errorf(
"%w: %q carries a byte above 0x7F; a provider ID is a wire identity and only ASCII "+
"round-trips through every reader", ErrBadProviderID, s)
}
if strings.Contains(nodeName, "/") {
return "", "", fmt.Errorf(
"%w: %q names the node %q, which itself holds a slash. A node name is a single "+
"DNS-1123 label, and accepting a second slash would let two different inputs "+
"produce one provider ID", ErrBadProviderID, s, nodeName)
}
return cluster, nodeName, nil
}
func isASCII(s string) bool {
for i := 0; i < len(s); i++ {
if s[i] > 0x7F {
return false
}
}
return true
}
