func ClusterScopedUniqueName()

in pkg/common/uniquename/uniquename.go [59:119]
47 lines of code
8 McCabe index (conditional complexity)

func ClusterScopedUniqueName(format Format, namespace, name string) (string, error) {
	reservedSlots := 2 + uuidLength // 2 dashes + 5 character UUID string

	switch format {
	case DNS1123Subdomain:
		availableSlots := validation.DNS1123SubdomainMaxLength // 253 characters
		slotsPerSeg := (availableSlots - reservedSlots) / 2
		uniqueName := fmt.Sprintf("%s-%s-%s",
			namespace[:minInt(slotsPerSeg, len(namespace))],
			name[:minInt(slotsPerSeg, len(name))],
			uuid.NewUUID()[:uuidLength],
		)

		if errs := validation.IsDNS1123Subdomain(uniqueName); len(errs) != 0 {
			return "", fmt.Errorf("failed to format a unique RFC 1123 DNS subdomain name with namespace %s, name %s: %v", namespace, name, errs)
		}
		return uniqueName, nil
	case DNS1123Label:
		availableSlots := validation.DNS1123LabelMaxLength // 63 characters
		slotsPerSeg := (availableSlots - reservedSlots) / 2

		// If the object name is a RFC 1123 DNS subdomain, it may include dot characters, which is not allowed in
		// RFC 1123 DNS labels.
		name = removeDots(name)

		uniqueName := fmt.Sprintf("%s-%s-%s",
			namespace[:minInt(slotsPerSeg, len(namespace))],
			name[:minInt(slotsPerSeg, len(name))],
			uuid.NewUUID()[:uuidLength],
		)

		if errs := validation.IsDNS1123Label(uniqueName); len(errs) != 0 {
			return "", fmt.Errorf("failed to format a unique RFC 1123 DNS label name with namespace %s, name %s: %v", namespace, name, errs)
		}
		return uniqueName, nil
	case DNS1035Label:
		availableSlots := validation.DNS1035LabelMaxLength // 63 characters
		slotsPerSeg := (availableSlots - reservedSlots) / 2

		// Namespace names are RFC 1123 DNS labels, which may start with an alphanumeric character; RFC 1035 DNS
		// labels, on the other hand, does not allow numeric characters at the beginning of the string.
		if startsWithNumericCharacter(namespace) {
			namespace = "ns" + namespace
		}
		// If the object name is a RFC 1123 DNS subdomain, it may include dot characters, which is not allowed in
		// RFC 1035 DNS labels.
		name = removeDots(name)

		uniqueName := fmt.Sprintf("%s-%s-%s",
			namespace[:minInt(slotsPerSeg, len(namespace))],
			name[:minInt(slotsPerSeg, len(name))],
			uuid.NewUUID()[:uuidLength],
		)

		if errs := validation.IsDNS1035Label(uniqueName); len(errs) != 0 {
			return "", fmt.Errorf("failed to format a unique RFC 1035 DNS label name with namespace %s, name %s: %v", namespace, name, errs)
		}
		return uniqueName, nil
	}
	return "", fmt.Errorf("not a valid name format: %d", format)
}