Implement tenant import and RP auto login policies

backend/internal/domain/hanmac_email.go

@@ -0,0 +1,196 @@
+package domain
+
+import (
+	"errors"
+	"strings"
+	"unicode"
+)
+
+var hanmacSurnameRomanization = map[rune]string{
+	'한': "han",
+	'김': "kim",
+	'이': "lee",
+	'박': "park",
+	'최': "choi",
+	'정': "jung",
+	'조': "cho",
+	'강': "kang",
+	'윤': "yoon",
+	'장': "jang",
+	'임': "lim",
+	'림': "lim",
+	'신': "shin",
+	'오': "oh",
+	'서': "seo",
+	'권': "kwon",
+	'황': "hwang",
+	'안': "ahn",
+	'송': "song",
+	'전': "jeon",
+	'홍': "hong",
+	'유': "yoo",
+	'고': "ko",
+	'문': "moon",
+	'양': "yang",
+	'손': "son",
+	'배': "bae",
+	'백': "baek",
+	'허': "heo",
+	'남': "nam",
+	'심': "sim",
+	'노': "noh",
+	'하': "ha",
+	'곽': "kwak",
+	'성': "sung",
+	'차': "cha",
+	'주': "joo",
+	'우': "woo",
+	'구': "koo",
+	'민': "min",
+	'류': "ryu",
+	'나': "na",
+	'진': "jin",
+	'지': "ji",
+	'엄': "um",
+	'채': "chae",
+	'원': "won",
+	'천': "cheon",
+	'방': "bang",
+	'공': "gong",
+	'현': "hyun",
+	'함': "ham",
+	'여': "yeo",
+	'추': "choo",
+	'도': "do",
+	'소': "so",
+	'석': "seok",
+	'선': "sun",
+	'설': "seol",
+	'마': "ma",
+	'길': "gil",
+	'연': "yeon",
+	'위': "wi",
+	'표': "pyo",
+	'명': "myung",
+	'기': "ki",
+	'반': "ban",
+	'라': "ra",
+	'왕': "wang",
+	'금': "geum",
+	'옥': "ok",
+	'육': "yook",
+	'인': "in",
+	'맹': "maeng",
+	'제': "je",
+	'모': "mo",
+	'탁': "tak",
+	'국': "guk",
+	'어': "eo",
+	'은': "eun",
+	'편': "pyeon",
+	'용': "yong",
+}
+
+var hanmacInitialRomanization = []string{
+	"g", "g", "n", "d", "d", "r", "m", "b", "b", "s",
+	"s", "y", "j", "j", "c", "k", "t", "p", "h",
+}
+
+func SplitEmailDomain(email string) (string, string, error) {
+	normalized := strings.ToLower(strings.TrimSpace(email))
+	at := strings.Index(normalized, "@")
+	if at < 0 {
+		return "", "", errors.New("email must contain @")
+	}
+	if strings.Count(normalized, "@") != 1 {
+		return "", "", errors.New("email must contain one @")
+	}
+	localPart := strings.TrimSpace(normalized[:at])
+	domainPart := strings.TrimSpace(normalized[at+1:])
+	if domainPart == "" || !strings.Contains(domainPart, ".") {
+		return "", "", errors.New("email domain is invalid")
+	}
+	return localPart, domainPart, nil
+}
+
+func ExtractNormalizedEmailLocalPart(email string) (string, error) {
+	localPart, _, err := SplitEmailDomain(email)
+	if err != nil {
+		return "", err
+	}
+	if localPart == "" {
+		return "", errors.New("email local-part is empty")
+	}
+	return localPart, nil
+}
+
+func BuildKoreanNameEmailBase(name string) (string, bool, error) {
+	runes := compactNameRunes(name)
+	if len(runes) < 2 {
+		return "", true, nil
+	}
+
+	surname, ok := hanmacSurnameRomanization[runes[0]]
+	if !ok {
+		return "", true, nil
+	}
+
+	var builder strings.Builder
+	for _, r := range runes[1:] {
+		initial, ok := romanizedHangulInitial(r)
+		if !ok {
+			return "", true, nil
+		}
+		builder.WriteString(initial)
+	}
+	builder.WriteString(surname)
+	return builder.String(), false, nil
+}
+
+func MatchesSuggestedNameRule(localPart string, base string) bool {
+	localPart = strings.ToLower(strings.TrimSpace(localPart))
+	base = strings.ToLower(strings.TrimSpace(base))
+	if localPart == "" || base == "" {
+		return false
+	}
+	if localPart == base {
+		return true
+	}
+	if !strings.HasPrefix(localPart, base) {
+		return false
+	}
+	suffix := localPart[len(base):]
+	if suffix == "" {
+		return false
+	}
+	for _, r := range suffix {
+		if r < '0' || r > '9' {
+			return false
+		}
+	}
+	return true
+}
+
+func compactNameRunes(name string) []rune {
+	var runes []rune
+	for _, r := range strings.TrimSpace(name) {
+		if unicode.IsSpace(r) {
+			continue
+		}
+		runes = append(runes, r)
+	}
+	return runes
+}
+
+func romanizedHangulInitial(r rune) (string, bool) {
+	const hangulBase = 0xAC00
+	const hangulEnd = 0xD7A3
+	if r < hangulBase || r > hangulEnd {
+		return "", false
+	}
+	index := int(r-hangulBase) / 588
+	if index < 0 || index >= len(hanmacInitialRomanization) {
+		return "", false
+	}
+	return hanmacInitialRomanization[index], true
+}