93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
package validation
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import (
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"errors"
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"net"
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"strings"
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"unicode"
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"unicode/utf8"
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)
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const (
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MaxAccountBytes = 20
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MaxNameRunes = 10
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MaxDomainCount = 100
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)
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func NormalizeAccount(value string) (string, error) {
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value = strings.TrimSpace(value)
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if len(value) == 0 || len(value) > MaxAccountBytes {
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return "", errors.New("invalid account length")
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}
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for index, char := range []byte(value) {
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isLetter := char >= 'a' && char <= 'z' || char >= 'A' && char <= 'Z'
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isDigit := char >= '0' && char <= '9'
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if !isLetter && !isDigit && char != '.' && char != '_' && char != '-' {
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return "", errors.New("invalid account character")
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}
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if (index == 0 || index == len(value)-1) && !isLetter && !isDigit {
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return "", errors.New("invalid account boundary")
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}
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}
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return value, nil
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}
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func NormalizeDisplayName(value string) (string, error) {
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value = strings.TrimSpace(value)
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if value == "" || !utf8.ValidString(value) || utf8.RuneCountInString(value) > MaxNameRunes {
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return "", errors.New("invalid display name length")
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}
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for _, char := range value {
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if unicode.IsControl(char) {
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return "", errors.New("invalid display name character")
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}
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}
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return value, nil
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}
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func NormalizeDomain(value string) (string, error) {
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value = strings.ToLower(strings.TrimSpace(value))
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value = strings.TrimSuffix(value, ".")
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if value == "" || len(value) > 253 || net.ParseIP(value) != nil || strings.ContainsAny(value, ":/@\\?#") {
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return "", errors.New("invalid domain")
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}
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labels := strings.Split(value, ".")
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for _, label := range labels {
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if len(label) == 0 || len(label) > 63 || label[0] == '-' || label[len(label)-1] == '-' {
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return "", errors.New("invalid domain label")
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}
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for _, char := range []byte(label) {
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isLetter := char >= 'a' && char <= 'z'
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isDigit := char >= '0' && char <= '9'
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if !isLetter && !isDigit && char != '-' {
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return "", errors.New("invalid domain character")
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}
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}
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}
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return value, nil
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}
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func NormalizeDomainList(value string) ([]string, error) {
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if strings.TrimSpace(value) == "" {
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return nil, nil
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}
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parts := strings.Split(value, ",")
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if len(parts) > MaxDomainCount {
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return nil, errors.New("too many domains")
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}
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seen := make(map[string]struct{}, len(parts))
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result := make([]string, 0, len(parts))
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for _, part := range parts {
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domain, err := NormalizeDomain(part)
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if err != nil {
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return nil, err
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}
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if _, exists := seen[domain]; exists {
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continue
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}
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seen[domain] = struct{}{}
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result = append(result, domain)
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}
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return result, nil
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}
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