feat: SEO backend data (1/4)

internal/domain/site/siteDomain.go

@@ -18,6 +18,8 @@ var (
 	ErrInvalidLocale   = errors.New("invalid locale")
 	ErrUseSetDefault   = errors.New("the default flag is changed through the default route")
 	ErrInvalidReassign = errors.New("invalid reassign destination")
+
+	ErrInvalidTitleTemplate = errors.New("the title template must contain %title%")
 )
 
 const (
@@ -30,8 +32,14 @@ const (
 	MinNameRunes = 1
 	MaxNameRunes = 100
 
+	MaxLocaleRunes  = 35
+	MaxBaseURLRunes = 255
+
 	MinKeyRunes = 2
 	MaxKeyRunes = 32
+
+	TitlePlaceholder     = "%title%"
+	DefaultTitleTemplate = "%title% | %site%"
 )
 
 var keyPattern = regexp.MustCompile(`^[a-z0-9]+(-[a-z0-9]+)*$`)
@@ -49,6 +57,9 @@ type Site struct {
 	Locale               *string `json:"locale"`
 	IsDefault            bool    `json:"is_default"`
 	ArticleCount         int     `json:"article_count"`
+	SiteName             string  `json:"site_name"`
+	TitleTemplate        string  `json:"title_template"`
+	DefaultDescription   string  `json:"default_description"`
 }
 
 type Nullable[T any] struct {
@@ -64,6 +75,9 @@ type Patch struct {
 	Locale               Nullable[string]
 	DefaultSocialImageID Nullable[uint32]
 	IsDefault            *bool
+	SiteName             *string
+	TitleTemplate        *string
+	DefaultDescription   *string
 }
 
 func IsValidKey(key string) bool {
@@ -76,11 +90,18 @@ func IsValidName(name string) bool {
 	return length >= MinNameRunes && length <= MaxNameRunes
 }
 
+func ValidateTitleTemplate(template string) error {
+	if !strings.Contains(template, TitlePlaceholder) {
+		return ErrInvalidTitleTemplate
+	}
+	return nil
+}
+
 func NormalizeLocale(locale *string) (*string, error) {
 	if locale == nil || *locale == "" {
 		return nil, nil
 	}
-	if !localePattern.MatchString(*locale) {
+	if utf8.RuneCountInString(*locale) > MaxLocaleRunes || !localePattern.MatchString(*locale) {
 		return nil, ErrInvalidLocale
 	}
 	return locale, nil
@@ -126,7 +147,11 @@ func NormalizeBaseURL(raw string) (string, error) {
 	if found.scheme == "http" && !isLoopback(found.hostname) {
 		return "", ErrInvalidSiteURL
 	}
-	return found.scheme + "://" + found.host, nil
+	normalized := found.scheme + "://" + found.host
+	if utf8.RuneCountInString(normalized) > MaxBaseURLRunes {
+		return "", ErrInvalidSiteURL
+	}
+	return normalized, nil
 }
 
 func SeedBaseURL(publicURL string) (string, error) {