feat: site languages, setup and site URL settings

internal/infrastructure/persistence/database/driver.go

@@ -23,6 +23,7 @@ type Config struct {
 type Driver interface {
 	Open(source string) (*gorm.DB, error)
 	NewBackup(db *gorm.DB, directory string, now func() time.Time) domainUpdate.DatabaseBackup
+	IsLockContention(err error) bool
 }
 
 var drivers = map[string]Driver{
@@ -31,6 +32,15 @@ var drivers = map[string]Driver{
 	DriverPostgres: postgresDriver{},
 }
 
+func IsLockContentionFor(driverName string, err error) bool {
+	driver, ok := drivers[driverName]
+	return ok && err != nil && driver.IsLockContention(err)
+}
+
+func IsLockContention(db *gorm.DB, err error) bool {
+	return IsLockContentionFor(db.Name(), err)
+}
+
 type Connection struct {
 	DB     *gorm.DB
 	driver Driver

internal/infrastructure/persistence/database/mysql.go

@@ -2,6 +2,7 @@ package database
 
 import (
 	domainUpdate "RenewCMS/internal/domain/update"
+	"errors"
 	"fmt"
 	"net"
 	"strings"
@@ -22,6 +23,8 @@ const (
 	mysqlSessionSQLMode  = "'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'"
 	mysqlTableOptionsKey = "gorm:table_options"
 	redactedPassword     = "***"
+	mysqlLockNowait      = 3572
+	mysqlLockWaitTimeout = 1205
 )
 
 type mysqlDriver struct{}
@@ -84,3 +87,8 @@ func tableOptionsFor(db *gorm.DB) *gorm.DB {
 	}
 	return db
 }
+
+func (mysqlDriver) IsLockContention(err error) bool {
+	var failure *mysqldriver.MySQLError
+	return errors.As(err, &failure) && (failure.Number == mysqlLockNowait || failure.Number == mysqlLockWaitTimeout)
+}

internal/infrastructure/persistence/database/postgres.go

@@ -2,6 +2,7 @@ package database
 
 import (
 	domainUpdate "RenewCMS/internal/domain/update"
+	"errors"
 	"fmt"
 	"net"
 	"net/url"
@@ -21,6 +22,7 @@ const (
 	postgresScheme                = "postgres"
 	postgresUTCCallback           = "renewcms:postgres_utc"
 	gormQueryCallback             = "gorm:query"
+	postgresLockNotAvailable      = "55P03"
 )
 
 var timeType = reflect.TypeOf(time.Time{})
@@ -106,3 +108,8 @@ func convertStructTimesToUTC(value reflect.Value) {
 func (postgresDriver) NewBackup(db *gorm.DB, directory string, now func() time.Time) domainUpdate.DatabaseBackup {
 	return NewPostgresBackup(db, directory, now)
 }
+
+func (postgresDriver) IsLockContention(err error) bool {
+	var failure *pgconn.PgError
+	return errors.As(err, &failure) && failure.Code == postgresLockNotAvailable
+}

internal/infrastructure/persistence/database/sqlite.go

@@ -2,6 +2,7 @@ package database
 
 import (
 	domainUpdate "RenewCMS/internal/domain/update"
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -13,7 +14,12 @@ import (
 
 const DriverSQLite = "sqlite"
 
-const sqliteBusyTimeoutMs = 5000
+const (
+	sqliteBusyTimeoutMs = 5000
+	sqliteResultBusy    = 5
+	sqliteResultLocked  = 6
+	sqlitePrimaryMask   = 0xff
+)
 
 type sqliteDriver struct{}
 
@@ -31,3 +37,12 @@ func (sqliteDriver) Open(file string) (*gorm.DB, error) {
 func (sqliteDriver) NewBackup(db *gorm.DB, directory string, now func() time.Time) domainUpdate.DatabaseBackup {
 	return NewSQLiteBackup(db, directory, now)
 }
+
+func (sqliteDriver) IsLockContention(err error) bool {
+	var coded interface{ Code() int }
+	if !errors.As(err, &coded) {
+		return false
+	}
+	primary := coded.Code() & sqlitePrimaryMask
+	return primary == sqliteResultBusy || primary == sqliteResultLocked
+}

internal/infrastructure/persistence/mappers/localizationMapper.go

@@ -0,0 +1,27 @@
+package mappers
+
+import (
+	"RenewCMS/internal/domain/localization"
+	"RenewCMS/internal/infrastructure/persistence/models"
+)
+
+func LocalizationRowToDomain(m models.SiteLanguage) localization.Row {
+	return localization.Row{
+		Tag:          m.Lang,
+		IsDefault:    m.IsDefault,
+		Enabled:      m.Enabled,
+		Confirmed:    m.Confirmed,
+		SocialLocale: m.SocialLocale,
+	}
+}
+
+func LocalizationRowToModel(siteID uint32, row localization.Row) models.SiteLanguage {
+	return models.SiteLanguage{
+		SiteID:       siteID,
+		Lang:         row.Tag,
+		IsDefault:    row.IsDefault,
+		Enabled:      row.Enabled,
+		Confirmed:    row.Confirmed,
+		SocialLocale: row.SocialLocale,
+	}
+}

internal/infrastructure/persistence/mappers/siteMapper.go

@@ -23,6 +23,7 @@ func SiteToDomain(m models.Site, articleCount int) site.Site {
 		SiteName:             m.SiteName,
 		TitleTemplate:        titleTemplate,
 		DefaultDescription:   m.DefaultDescription,
+		PublicURLPattern:     m.PublicURLPattern,
 	}
 }
 
@@ -39,5 +40,6 @@ func SiteToModel(s site.Site) models.Site {
 		SiteName:             s.SiteName,
 		TitleTemplate:        s.TitleTemplate,
 		DefaultDescription:   s.DefaultDescription,
+		PublicURLPattern:     s.PublicURLPattern,
 	}
 }

internal/infrastructure/persistence/models/siteLanguageModel.go

@@ -3,11 +3,12 @@ package models
 import "time"
 
 type SiteLanguage struct {
-	SiteID    uint32    `gorm:"primaryKey;autoIncrement:false"`
-	Lang      string    `gorm:"primaryKey;size:35;not null"`
-	IsDefault bool      `gorm:"not null;default:false"`
-	Enabled   bool      `gorm:"not null;default:true"`
-	Confirmed bool      `gorm:"not null;default:false"`
-	CreatedAt time.Time `gorm:"autoCreateTime"`
-	UpdatedAt time.Time `gorm:"autoUpdateTime"`
+	SiteID       uint32    `gorm:"primaryKey;autoIncrement:false"`
+	Lang         string    `gorm:"primaryKey;size:35;not null"`
+	IsDefault    bool      `gorm:"not null;default:false"`
+	Enabled      bool      `gorm:"not null;default:true"`
+	Confirmed    bool      `gorm:"not null;default:false"`
+	SocialLocale *string   `gorm:"size:35"`
+	CreatedAt    time.Time `gorm:"autoCreateTime"`
+	UpdatedAt    time.Time `gorm:"autoUpdateTime"`
 }

internal/infrastructure/persistence/models/siteModel.go

@@ -14,6 +14,7 @@ type Site struct {
 	SiteName             string    `gorm:"size:100;not null;default:''"`
 	TitleTemplate        string    `gorm:"size:200"`
 	DefaultDescription   string    `gorm:"size:320;not null;default:''"`
+	PublicURLPattern     *string   `gorm:"size:512"`
 	CreatedAt            time.Time `gorm:"autoCreateTime"`
 	UpdatedAt            time.Time `gorm:"autoUpdateTime"`
 }

internal/infrastructure/persistence/repositories/articleRepository.go

@@ -3,6 +3,7 @@ package persistence
 import (
 	domain "RenewCMS/internal/domain/article"
 	authordomain "RenewCMS/internal/domain/author"
+	"RenewCMS/internal/domain/language"
 	"RenewCMS/internal/infrastructure/persistence/mappers"
 	entity "RenewCMS/internal/infrastructure/persistence/models"
 	"errors"
@@ -605,6 +606,11 @@ func (a *ArticleRepository) RepointImage(fromImageIDs []uint32, toImageID uint32
 
 var _ domain.Repository = &ArticleRepository{}
 
+func (a *ArticleRepository) AssignUnassignedLanguage(siteID uint32, lang string) (int, error) {
+	result := a.db.Unscoped().Model(&entity.Article{}).Where("site_id = ? AND lang = ?", siteID, language.Unassigned).UpdateColumn("lang", lang)
+	return int(result.RowsAffected), result.Error
+}
+
 func (a *ArticleRepository) ListForAccount(creatorID uint32, authorID *uint32) ([]domain.Article, error) {
 	query := a.db.Model(&entity.Article{})
 	if authorID == nil {

internal/infrastructure/persistence/repositories/localizationRepository.go

@@ -0,0 +1,149 @@
+package persistence
+
+import (
+	domain "RenewCMS/internal/domain/localization"
+	"RenewCMS/internal/infrastructure/persistence/mappers"
+	entity "RenewCMS/internal/infrastructure/persistence/models"
+	"slices"
+
+	"gorm.io/gorm"
+)
+
+type LocalizationRepository struct {
+	db *gorm.DB
+}
+
+func NewLocalizationRepository(db *gorm.DB) *LocalizationRepository {
+	return &LocalizationRepository{db}
+}
+
+type languageTotal struct {
+	Lang  string
+	Total int
+}
+
+func (l *LocalizationRepository) Rows(siteID uint32) ([]domain.Row, error) {
+	var found []entity.SiteLanguage
+	if err := l.db.Where("site_id = ?", siteID).Order("lang ASC").Find(&found).Error; err != nil {
+		return nil, err
+	}
+	rows := make([]domain.Row, 0, len(found))
+	for _, row := range found {
+		rows = append(rows, mappers.LocalizationRowToDomain(row))
+	}
+	return rows, nil
+}
+
+func (l *LocalizationRepository) ConfirmedSites() (map[uint32]bool, error) {
+	var ids []uint32
+	err := l.db.Model(&entity.SiteLanguage{}).Where("is_default = ? AND confirmed = ?", true, true).Distinct().Pluck("site_id", &ids).Error
+	if err != nil {
+		return nil, err
+	}
+	confirmed := make(map[uint32]bool, len(ids))
+	for _, id := range ids {
+		confirmed[id] = true
+	}
+	return confirmed, nil
+}
+
+func (l *LocalizationRepository) VersionCounts(siteID uint32) (map[string]domain.VersionCount, error) {
+	totals, err := l.countByLanguage(l.db.Where("site_id = ?", siteID))
+	if err != nil {
+		return nil, err
+	}
+	published, err := l.countByLanguage(l.db.Where("site_id = ? AND is_online = ?", siteID, true))
+	if err != nil {
+		return nil, err
+	}
+	trashed, err := l.countByLanguage(l.db.Unscoped().Where("site_id = ? AND deleted_at IS NOT NULL", siteID))
+	if err != nil {
+		return nil, err
+	}
+	counts := make(map[string]domain.VersionCount, len(totals))
+	for lang, total := range totals {
+		counts[lang] = domain.VersionCount{Total: total, Published: published[lang]}
+	}
+	for lang, count := range trashed {
+		kept := counts[lang]
+		kept.Trashed = count
+		counts[lang] = kept
+	}
+	return counts, nil
+}
+
+func (l *LocalizationRepository) countByLanguage(scope *gorm.DB) (map[string]int, error) {
+	var totals []languageTotal
+	err := scope.Model(&entity.Article{}).Select("lang, COUNT(*) AS total").Group("lang").Scan(&totals).Error
+	if err != nil {
+		return nil, err
+	}
+	counted := make(map[string]int, len(totals))
+	for _, total := range totals {
+		counted[total.Lang] = total.Total
+	}
+	return counted, nil
+}
+
+func (l *LocalizationRepository) Replace(siteID uint32, rows []domain.Row) error {
+	existing, err := l.Rows(siteID)
+	if err != nil {
+		return err
+	}
+	known := make(map[string]domain.Row, len(existing))
+	for _, row := range existing {
+		known[row.Tag] = row
+	}
+	wanted := make([]string, 0, len(rows))
+	for _, row := range rows {
+		wanted = append(wanted, row.Tag)
+	}
+	for _, row := range existing {
+		if !slices.Contains(wanted, row.Tag) {
+			if err := l.db.Where("site_id = ? AND lang = ?", siteID, row.Tag).Delete(&entity.SiteLanguage{}).Error; err != nil {
+				return err
+			}
+		}
+	}
+	if err := l.clearOtherDefaults(siteID, rows); err != nil {
+		return err
+	}
+	for _, row := range rows {
+		if err := l.save(siteID, row, known); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (l *LocalizationRepository) clearOtherDefaults(siteID uint32, rows []domain.Row) error {
+	for _, row := range rows {
+		if row.IsDefault {
+			return l.db.Model(&entity.SiteLanguage{}).Where("site_id = ? AND is_default = ? AND lang <> ?", siteID, true, row.Tag).UpdateColumn("is_default", false).Error
+		}
+	}
+	return nil
+}
+
+func (l *LocalizationRepository) save(siteID uint32, row domain.Row, known map[string]domain.Row) error {
+	before, exists := known[row.Tag]
+	if !exists {
+		model := mappers.LocalizationRowToModel(siteID, row)
+		return l.db.Create(&model).Error
+	}
+	if before.Equal(row) {
+		return nil
+	}
+	changes := map[string]any{"is_default": row.IsDefault, "enabled": row.Enabled, "confirmed": row.Confirmed, "social_locale": row.SocialLocale}
+	return l.db.Model(&entity.SiteLanguage{}).Where("site_id = ? AND lang = ?", siteID, row.Tag).Updates(changes).Error
+}
+
+func (l *LocalizationRepository) ConfirmSetup(siteID uint32, tag string) error {
+	if err := l.db.Where("site_id = ? AND confirmed = ?", siteID, false).Delete(&entity.SiteLanguage{}).Error; err != nil {
+		return err
+	}
+	confirmed := entity.SiteLanguage{SiteID: siteID, Lang: tag, IsDefault: true, Enabled: true, Confirmed: true}
+	return l.db.Create(&confirmed).Error
+}
+
+var _ domain.Repository = &LocalizationRepository{}

internal/infrastructure/persistence/repositories/siteRepository.go

@@ -4,6 +4,7 @@ import (
 	domain "RenewCMS/internal/domain/site"
 	"RenewCMS/internal/infrastructure/persistence/mappers"
 	entity "RenewCMS/internal/infrastructure/persistence/models"
+	"slices"
 	"strings"
 
 	"gorm.io/gorm"
@@ -166,6 +167,24 @@ func lockSite(tx *gorm.DB, id uint32) (entity.Site, error) {
 	return locked, nil
 }
 
+func (s *SiteRepository) LockSite(id uint32) error {
+	_, err := lockSite(s.db, id)
+	return err
+}
+
+func (s *SiteRepository) TryLockSites(ids []uint32) error {
+	ordered := slices.Clone(ids)
+	slices.Sort(ordered)
+	for _, id := range ordered {
+		var locked entity.Site
+		err := s.db.Clauses(clause.Locking{Strength: "UPDATE", Options: "NOWAIT"}).First(&locked, id).Error
+		if err != nil {
+			return mapNotFoundErr(err, domain.ErrSiteNotFound)
+		}
+	}
+	return nil
+}
+
 func unflagDefaults(tx *gorm.DB, exceptID uint32) error {
 	return tx.Model(&entity.Site{}).Where("is_default = ? AND id <> ?", true, exceptID).UpdateColumn("is_default", false).Error
 }
@@ -180,6 +199,7 @@ func (s *SiteRepository) Update(site domain.Site) (domain.Site, error) {
 		"site_name":               site.SiteName,
 		"title_template":          site.TitleTemplate,
 		"default_description":     site.DefaultDescription,
+		"public_url_pattern":      site.PublicURLPattern,
 	}
 	if _, err := s.Get(site.ID); err != nil {
 		return domain.Site{}, err

internal/infrastructure/persistence/repositories/transactor.go

@@ -2,7 +2,9 @@ package persistence
 
 import (
 	domain "RenewCMS/internal/domain/transaction"
+	"RenewCMS/internal/infrastructure/persistence/database"
 	"context"
+	"fmt"
 
 	"gorm.io/gorm"
 )
@@ -18,14 +20,19 @@ func NewTransactor(db *gorm.DB) *Transactor {
 }
 
 func (t *Transactor) Run(ctx context.Context, work func(domain.Repositories) error) error {
-	return t.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+	err := t.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
 		return work(domain.Repositories{
-			Articles:  NewArticleRepository(tx),
-			Sites:     NewSiteRepository(tx),
-			Authors:   NewAuthorRepository(tx),
-			Entries:   NewEntryRepository(tx),
-			Images:    NewImageRepository(tx),
-			Languages: NewSiteLanguageRepository(tx),
+			Articles:     NewArticleRepository(tx),
+			Sites:        NewSiteRepository(tx),
+			Authors:      NewAuthorRepository(tx),
+			Entries:      NewEntryRepository(tx),
+			Images:       NewImageRepository(tx),
+			Languages:    NewSiteLanguageRepository(tx),
+			Localization: NewLocalizationRepository(tx),
 		})
 	})
+	if database.IsLockContention(t.db, err) {
+		return fmt.Errorf("%w: %w", domain.ErrLockContention, err)
+	}
+	return err
 }

internal/infrastructure/useCases/ApplyLanguageSetup.go

@@ -0,0 +1,162 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/language"
+	"RenewCMS/internal/domain/localization"
+	"RenewCMS/internal/domain/site"
+	"RenewCMS/internal/domain/transaction"
+	"context"
+	"errors"
+	"fmt"
+	"slices"
+)
+
+type ApplyLanguageSetupUseCase struct {
+	transactor transaction.Transactor
+	recorder   audit.Recorder
+}
+
+func NewApplyLanguageSetupUseCase(transactor transaction.Transactor, recorder audit.Recorder) *ApplyLanguageSetupUseCase {
+	return &ApplyLanguageSetupUseCase{transactor, recorder}
+}
+
+func (a *ApplyLanguageSetupUseCase) Apply(ctx context.Context, choices []localization.SetupChoice) (localization.SetupResult, error) {
+	event := audit.NewEvent(audit.ActionSiteLanguageSetup, audit.CategorySites)
+	result, confirmed, err := a.confirm(ctx, choices)
+	if errors.Is(err, transaction.ErrLockContention) {
+		err = fmt.Errorf("%w: %w", localization.ErrSetupInProgress, err)
+	}
+	if err != nil {
+		recordFailure(ctx, a.recorder, event, err)
+		return localization.SetupResult{}, err
+	}
+	for _, found := range confirmed {
+		a.recordConfirmed(ctx, found, result)
+	}
+	return result, nil
+}
+
+func (a *ApplyLanguageSetupUseCase) confirm(ctx context.Context, choices []localization.SetupChoice) (localization.SetupResult, []site.Site, error) {
+	chosen, err := normalizeSetupChoices(choices)
+	if err != nil {
+		return localization.SetupResult{}, nil, err
+	}
+	var result localization.SetupResult
+	var confirmed []site.Site
+	err = a.transactor.Run(ctx, func(tx transaction.Repositories) error {
+		result = localization.SetupResult{Sites: []localization.SetupAssignment{}, Skipped: []string{}}
+		confirmed = nil
+		for key := range chosen {
+			if _, err := tx.Sites.GetByKey(key); err != nil {
+				return err
+			}
+		}
+		pending, err := lockPendingSites(tx)
+		if err != nil {
+			return err
+		}
+		for _, found := range pending {
+			if _, ok := chosen[found.Key]; !ok {
+				return localization.ErrSetupIncomplete
+			}
+		}
+		for _, found := range pending {
+			assignment, err := confirmSite(tx, found, chosen[found.Key])
+			if err != nil {
+				return err
+			}
+			result.Assigned += assignment.Assigned
+			result.Sites = append(result.Sites, assignment)
+			confirmed = append(confirmed, found)
+		}
+		result.Skipped = skippedChoices(chosen, pending)
+		return nil
+	})
+	if err != nil {
+		return localization.SetupResult{}, nil, err
+	}
+	return result, confirmed, nil
+}
+
+func (a *ApplyLanguageSetupUseCase) recordConfirmed(ctx context.Context, found site.Site, result localization.SetupResult) {
+	event := audit.NewEvent(audit.ActionSiteLanguageSetup, audit.CategorySites)
+	event.Target = siteTarget(found)
+	for _, assignment := range result.Sites {
+		if assignment.Key == found.Key {
+			event.Changes = []audit.Change{audit.TextChange(audit.FieldDefaultLanguage, "", assignment.Lang)}
+			event.Params[audit.ParamAssigned] = assignment.Assigned
+		}
+	}
+	a.recorder.Record(ctx, event)
+}
+
+func lockPendingSites(tx transaction.Repositories) ([]site.Site, error) {
+	locked := map[uint32]bool{}
+	for {
+		pending, err := pendingSites(tx.Sites, tx.Localization)
+		if err != nil {
+			return nil, err
+		}
+		missing := []uint32{}
+		for _, id := range siteIDs(pending) {
+			if !locked[id] {
+				missing = append(missing, id)
+			}
+		}
+		if len(missing) == 0 {
+			return pending, nil
+		}
+		if err := tx.Sites.TryLockSites(missing); err != nil {
+			return nil, err
+		}
+		for _, id := range missing {
+			locked[id] = true
+		}
+	}
+}
+
+func confirmSite(tx transaction.Repositories, found site.Site, tag string) (localization.SetupAssignment, error) {
+	if err := tx.Localization.ConfirmSetup(found.ID, tag); err != nil {
+		return localization.SetupAssignment{}, err
+	}
+	assigned, err := tx.Articles.AssignUnassignedLanguage(found.ID, tag)
+	if err != nil {
+		return localization.SetupAssignment{}, err
+	}
+	return localization.SetupAssignment{Key: found.Key, Lang: tag, Assigned: assigned}, nil
+}
+
+func skippedChoices(chosen map[string]string, pending []site.Site) []string {
+	skipped := []string{}
+	for key := range chosen {
+		if !slices.ContainsFunc(pending, func(found site.Site) bool { return found.Key == key }) {
+			skipped = append(skipped, key)
+		}
+	}
+	slices.Sort(skipped)
+	return skipped
+}
+
+func normalizeSetupChoices(choices []localization.SetupChoice) (map[string]string, error) {
+	chosen := make(map[string]string, len(choices))
+	for _, choice := range choices {
+		tag, err := language.Normalize(choice.Lang)
+		if err != nil {
+			return nil, err
+		}
+		if _, repeated := chosen[choice.Key]; repeated {
+			return nil, localization.ErrDuplicateSite
+		}
+		chosen[choice.Key] = tag
+	}
+	return chosen, nil
+}
+
+func siteIDs(sites []site.Site) []uint32 {
+	ids := make([]uint32, 0, len(sites))
+	for _, found := range sites {
+		ids = append(ids, found.ID)
+	}
+	return ids
+}

internal/infrastructure/useCases/GetLanguageSetup.go

@@ -0,0 +1,48 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/localization"
+	"RenewCMS/internal/domain/site"
+	"cmp"
+	"slices"
+)
+
+type GetLanguageSetupUseCase struct {
+	sites        site.Repository
+	localization localization.Repository
+}
+
+func NewGetLanguageSetupUseCase(sites site.Repository, localization localization.Repository) *GetLanguageSetupUseCase {
+	return &GetLanguageSetupUseCase{sites, localization}
+}
+
+func (g *GetLanguageSetupUseCase) Get() (localization.SetupView, error) {
+	pending, err := pendingSites(g.sites, g.localization)
+	if err != nil {
+		return localization.SetupView{}, err
+	}
+	view := localization.SetupView{Sites: []localization.PendingSite{}, Available: localization.Available()}
+	for _, found := range pending {
+		view.Sites = append(view.Sites, localization.NewPendingSite(found))
+	}
+	return view, nil
+}
+
+func pendingSites(sites site.Repository, repository localization.Repository) ([]site.Site, error) {
+	all, err := sites.List()
+	if err != nil {
+		return nil, err
+	}
+	confirmed, err := repository.ConfirmedSites()
+	if err != nil {
+		return nil, err
+	}
+	pending := []site.Site{}
+	for _, candidate := range all {
+		if !confirmed[candidate.ID] {
+			pending = append(pending, candidate)
+		}
+	}
+	slices.SortFunc(pending, func(left site.Site, right site.Site) int { return cmp.Compare(left.ID, right.ID) })
+	return pending, nil
+}

internal/infrastructure/useCases/GetSiteLanguages.go

@@ -0,0 +1,35 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/localization"
+	"RenewCMS/internal/domain/site"
+)
+
+type GetSiteLanguagesUseCase struct {
+	sites        site.Repository
+	localization localization.Repository
+}
+
+func NewGetSiteLanguagesUseCase(sites site.Repository, localization localization.Repository) *GetSiteLanguagesUseCase {
+	return &GetSiteLanguagesUseCase{sites, localization}
+}
+
+func (g *GetSiteLanguagesUseCase) Get(key string) (localization.View, error) {
+	found, err := g.sites.GetByKey(key)
+	if err != nil {
+		return localization.View{}, err
+	}
+	return readSiteLanguages(g.localization, found.ID)
+}
+
+func readSiteLanguages(repository localization.Repository, siteID uint32) (localization.View, error) {
+	rows, err := repository.Rows(siteID)
+	if err != nil {
+		return localization.View{}, err
+	}
+	counts, err := repository.VersionCounts(siteID)
+	if err != nil {
+		return localization.View{}, err
+	}
+	return localization.BuildView(rows, counts), nil
+}

internal/infrastructure/useCases/UpdateSite.go

@@ -92,6 +92,13 @@ func (u *UpdateSiteUseCase) apply(before site.Site, patch site.Patch) (site.Site
 	if patch.DefaultDescription != nil {
 		after.DefaultDescription = *patch.DefaultDescription
 	}
+	if patch.PublicURLPattern.Set {
+		pattern, err := site.NormalizePublicURLPattern(patch.PublicURLPattern.Value)
+		if err != nil {
+			return site.Site{}, err
+		}
+		after.PublicURLPattern = pattern
+	}
 	return after, nil
 }
 
@@ -107,6 +114,7 @@ func (u *UpdateSiteUseCase) changes(before site.Site, after site.Site) []audit.C
 	changes = audit.AppendTextChange(changes, audit.FieldSiteName, before.SiteName, after.SiteName)
 	changes = audit.AppendTextChange(changes, audit.FieldTitleTemplate, before.TitleTemplate, after.TitleTemplate)
 	changes = audit.AppendTextChange(changes, audit.FieldDefaultDescription, before.DefaultDescription, after.DefaultDescription)
+	changes = audit.AppendTextChange(changes, audit.FieldPublicURLPattern, optionalText(before.PublicURLPattern), optionalText(after.PublicURLPattern))
 	return changes
 }
 

internal/infrastructure/useCases/UpdateSiteLanguages.go

@@ -0,0 +1,128 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/audit"
+	"RenewCMS/internal/domain/localization"
+	"RenewCMS/internal/domain/transaction"
+	"context"
+	"errors"
+	"fmt"
+	"slices"
+	"strings"
+)
+
+type UpdateSiteLanguagesUseCase struct {
+	transactor transaction.Transactor
+	recorder   audit.Recorder
+}
+
+type SiteLanguageEntry struct {
+	Lang         string
+	Enabled      bool
+	SocialLocale *string
+}
+
+type UpdateSiteLanguagesCommand struct {
+	Key       string
+	Revision  string
+	Default   string
+	Languages []SiteLanguageEntry
+}
+
+func NewUpdateSiteLanguagesUseCase(transactor transaction.Transactor, recorder audit.Recorder) *UpdateSiteLanguagesUseCase {
+	return &UpdateSiteLanguagesUseCase{transactor, recorder}
+}
+
+func (u *UpdateSiteLanguagesUseCase) Update(ctx context.Context, command UpdateSiteLanguagesCommand) (localization.View, error) {
+	event := audit.NewEvent(audit.ActionSiteLanguagesEdit, audit.CategorySites)
+	var view localization.View
+	var before []localization.Row
+	var after []localization.Row
+	err := u.transactor.Run(ctx, func(tx transaction.Repositories) error {
+		found, err := tx.Sites.GetByKey(command.Key)
+		if err != nil {
+			return err
+		}
+		event.Target = siteTarget(found)
+		if err := tx.Sites.LockSite(found.ID); err != nil {
+			return err
+		}
+		before, err = tx.Localization.Rows(found.ID)
+		if err != nil {
+			return err
+		}
+		if localization.NeedsSetup(before) {
+			return localization.ErrSetupRequired
+		}
+		if localization.Revision(before) != command.Revision {
+			return localization.ErrLanguagesChanged
+		}
+		counts, err := tx.Localization.VersionCounts(found.ID)
+		if err != nil {
+			return err
+		}
+		after, err = localization.Plan(before, counts, command.change())
+		if err != nil {
+			return err
+		}
+		if !localization.SameRows(before, after) {
+			if err := tx.Localization.Replace(found.ID, after); err != nil {
+				return err
+			}
+		}
+		view, err = readSiteLanguages(tx.Localization, found.ID)
+		return err
+	})
+	if errors.Is(err, transaction.ErrLockContention) {
+		err = fmt.Errorf("%w: %w", localization.ErrLanguagesChanged, err)
+	}
+	if err != nil {
+		recordFailure(ctx, u.recorder, event, err)
+		return localization.View{}, err
+	}
+	if changes := languageChanges(before, after); len(changes) > 0 {
+		event.Changes = changes
+		u.recorder.Record(ctx, event)
+	}
+	return view, nil
+}
+
+func languageChanges(before []localization.Row, after []localization.Row) []audit.Change {
+	changes := []audit.Change{}
+	changes = audit.AppendTextChange(changes, audit.FieldDefaultLanguage, defaultTag(before), defaultTag(after))
+	return audit.AppendTextChange(changes, audit.FieldLanguages, languagesLabel(before), languagesLabel(after))
+}
+
+func defaultTag(rows []localization.Row) string {
+	for _, row := range rows {
+		if row.IsDefault {
+			return row.Tag
+		}
+	}
+	return ""
+}
+
+func languagesLabel(rows []localization.Row) string {
+	ordered := slices.Clone(rows)
+	slices.SortFunc(ordered, func(left localization.Row, right localization.Row) int { return strings.Compare(left.Tag, right.Tag) })
+	labels := make([]string, 0, len(ordered))
+	for _, row := range ordered {
+		label := row.Tag
+		if !row.Enabled {
+			label += " (off)"
+		}
+		if row.SocialLocale != nil {
+			label += " [" + *row.SocialLocale + "]"
+		}
+		labels = append(labels, label)
+	}
+	return strings.Join(labels, ", ")
+}
+
+func (c UpdateSiteLanguagesCommand) change() localization.Change {
+	entries := make([]localization.Entry, 0, len(c.Languages))
+	for _, entry := range c.Languages {
+		entries = append(entries, localization.Entry{Tag: entry.Lang, Enabled: entry.Enabled, SocialLocale: entry.SocialLocale})
+	}
+	return localization.Change{Default: c.Default, Languages: entries}
+}

internal/infrastructure/useCases/auditFailures.go

@@ -6,8 +6,11 @@ import (
 	"RenewCMS/internal/domain/author"
 	"RenewCMS/internal/domain/image"
 	"RenewCMS/internal/domain/invite"
+	"RenewCMS/internal/domain/language"
+	"RenewCMS/internal/domain/localization"
 	"RenewCMS/internal/domain/purge"
 	"RenewCMS/internal/domain/site"
+	"RenewCMS/internal/domain/transaction"
 	"RenewCMS/internal/domain/update"
 	"RenewCMS/internal/domain/user"
 	"context"
@@ -76,6 +79,18 @@ var failureReasons = []failureReason{
 	{site.ErrInvalidTitleTemplate, "The title template must contain %title%."},
 	{site.ErrUseSetDefault, "Use the default site action to change the default."},
 	{site.ErrInvalidReassign, "The destination site is not valid."},
+	{localization.ErrSetupRequired, "The site has no confirmed default language yet."},
+	{localization.ErrLanguagesChanged, "The languages changed since they were read."},
+	{localization.ErrLanguageInUse, "A language still used by a version cannot be removed."},
+	{localization.ErrDefaultNotEnabled, "The default language must be an enabled language."},
+	{localization.ErrNoEnabledLanguage, "At least one language must stay enabled."},
+	{localization.ErrDuplicateLanguage, "The same language is listed twice."},
+	{localization.ErrInvalidSocialLocale, "The social locale is not valid."},
+	{localization.ErrSetupIncomplete, "Every site that needs a language must be listed."},
+	{localization.ErrDuplicateSite, "The same site is listed twice."},
+	{language.ErrInvalidLanguage, "The language tag is not valid."},
+	{language.ErrUnsupportedLanguage, "That language is not supported."},
+	{transaction.ErrLockContention, "Another change is running on this site. Please try again."},
 	{author.ErrSlugTaken, "That slug is already used by another author."},
 	{author.ErrUserAlreadyLinked, "That user already has an author."},
 	{author.ErrAuthorAlreadyLinked, "That author is already linked to a user."},

internal/infrastructure/useCases/siteAudit.go

@@ -45,3 +45,10 @@ func localeLabel(locale *string) string {
 	}
 	return *locale
 }
+
+func optionalText(text *string) string {
+	if text == nil {
+		return ""
+	}
+	return *text
+}