84 lines
2.4 KiB
Go
84 lines
2.4 KiB
Go
package domain
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import (
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"errors"
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"fmt"
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"hash/fnv"
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"strings"
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"unicode/utf8"
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)
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const maxInstanceNameRunes = 80
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var errInvalidInstanceName = errors.New("invalid instance name")
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// NormalizeInstanceName validates the user-visible instance name before it is
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// stored or used to derive a Windows profile directory. The validation keeps
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// the display name readable instead of silently rewriting user input.
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func NormalizeInstanceName(value string) (string, error) {
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name := strings.TrimSpace(value)
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if name == "" {
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return "", fmt.Errorf("%w: name is required", errInvalidInstanceName)
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}
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if utf8.RuneCountInString(name) > maxInstanceNameRunes {
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return "", fmt.Errorf("%w: name is too long", errInvalidInstanceName)
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}
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if strings.HasSuffix(name, ".") {
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return "", fmt.Errorf("%w: name cannot end with a period", errInvalidInstanceName)
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}
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for _, value := range name {
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if value < 0x20 || strings.ContainsRune(`<>:"/\\|?*`, value) {
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return "", fmt.Errorf("%w: name contains a Windows-reserved character", errInvalidInstanceName)
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}
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}
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base := strings.ToUpper(strings.Split(name, ".")[0])
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if isReservedWindowsDeviceName(base) {
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return "", fmt.Errorf("%w: name is a reserved Windows device name", errInvalidInstanceName)
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}
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return name, nil
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}
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// InstanceProfileDirectoryName derives a compact, readable, and unique
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// profile directory component. The stable hash keeps paths distinct even
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// when display names share a truncated prefix.
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func InstanceProfileDirectoryName(name, instanceID string) (string, error) {
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name, err := NormalizeInstanceName(name)
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if err != nil {
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return "", err
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}
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instanceID = strings.TrimSpace(instanceID)
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if instanceID == "" {
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return "", fmt.Errorf("%w: instance ID is required", errInvalidInstanceName)
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}
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segment := truncateUTF8(name, 64)
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hash := fnv.New32a()
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_, _ = hash.Write([]byte(instanceID))
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return fmt.Sprintf("instance-%s-%08x", segment, hash.Sum32()), nil
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}
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func truncateUTF8(value string, limit int) string {
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if len(value) <= limit {
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return value
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}
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count := 0
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for index := range value {
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if index > limit {
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break
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}
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count = index
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}
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if count == 0 {
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return value
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}
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return value[:count]
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}
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func isReservedWindowsDeviceName(value string) bool {
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switch value {
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case "CON", "PRN", "AUX", "NUL", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9":
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return true
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default:
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return false
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}
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}
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