feat: restrict languages (#6931)

* feat: return 404 or 409 if org reg disallowed

* fix: system limit permissions

* feat: add iam limits api

* feat: disallow public org registrations on default instance

* add integration test

* test: integration

* fix test

* docs: describe public org registrations

* avoid updating docs deps

* fix system limits integration test

* silence integration tests

* fix linting

* ignore strange linter complaints

* review

* improve reset properties naming

* redefine the api

* use restrictions aggregate

* test query

* simplify and test projection

* test commands

* fix unit tests

* move integration test

* support restrictions on default instance

* also test GetRestrictions

* self review

* lint

* abstract away resource owner

* fix tests

* configure supported languages

* fix allowed languages

* fix tests

* default lang must not be restricted

* preferred language must be allowed

* change preferred languages

* check languages everywhere

* lint

* test command side

* lint

* add integration test

* add integration test

* restrict supported ui locales

* lint

* lint

* cleanup

* lint

* allow undefined preferred language

* fix integration tests

* update main

* fix env var

* ignore linter

* ignore linter

* improve integration test config

* reduce cognitive complexity

* compile

* check for duplicates

* remove useless restriction checks

* review

* revert restriction renaming

* fix language restrictions

* lint

* generate

* allow custom texts for supported langs for now

* fix tests

* cleanup

* cleanup

* cleanup

* lint

* unsupported preferred lang is allowed

* fix integration test

* finish reverting to old property name

* finish reverting to old property name

* load languages

* refactor(i18n): centralize translators and fs

* lint

* amplify no validations on preferred languages

* fix integration test

* lint

* fix resetting allowed languages

* test unchanged restrictions

internal/command/restrictions_model.go

@@ -1,13 +1,17 @@
 package command
 
 import (
+	"golang.org/x/text/language"
+
+	"github.com/zitadel/zitadel/internal/domain"
 	"github.com/zitadel/zitadel/internal/eventstore"
 	"github.com/zitadel/zitadel/internal/repository/restrictions"
 )
 
 type restrictionsWriteModel struct {
 	eventstore.WriteModel
-	disallowPublicOrgRegistrations bool
+	disallowPublicOrgRegistration bool
+	allowedLanguages              []language.Tag
 }
 
 // newRestrictionsWriteModel aggregateId is filled by reducing unit matching events
@@ -34,8 +38,15 @@ func (wm *restrictionsWriteModel) Query() *eventstore.SearchQueryBuilder {
 func (wm *restrictionsWriteModel) Reduce() error {
 	for _, event := range wm.Events {
 		wm.ChangeDate = event.CreatedAt()
-		if e, ok := event.(*restrictions.SetEvent); ok && e.DisallowPublicOrgRegistrations != nil {
-			wm.disallowPublicOrgRegistrations = *e.DisallowPublicOrgRegistrations
+		e, ok := event.(*restrictions.SetEvent)
+		if !ok {
+			continue
+		}
+		if e.DisallowPublicOrgRegistration != nil {
+			wm.disallowPublicOrgRegistration = *e.DisallowPublicOrgRegistration
+		}
+		if e.AllowedLanguages != nil {
+			wm.allowedLanguages = *e.AllowedLanguages
 		}
 	}
 	return wm.WriteModel.Reduce()
@@ -48,8 +59,11 @@ func (wm *restrictionsWriteModel) NewChanges(setRestrictions *SetRestrictions) (
 		return nil
 	}
 	changes = make([]restrictions.RestrictionsChange, 0, 1)
-	if setRestrictions.DisallowPublicOrgRegistration != nil && (wm.disallowPublicOrgRegistrations != *setRestrictions.DisallowPublicOrgRegistration) {
-		changes = append(changes, restrictions.ChangePublicOrgRegistrations(*setRestrictions.DisallowPublicOrgRegistration))
+	if setRestrictions.DisallowPublicOrgRegistration != nil && (wm.disallowPublicOrgRegistration != *setRestrictions.DisallowPublicOrgRegistration) {
+		changes = append(changes, restrictions.ChangeDisallowPublicOrgRegistration(*setRestrictions.DisallowPublicOrgRegistration))
+	}
+	if setRestrictions.AllowedLanguages != nil && domain.LanguagesDiffer(wm.allowedLanguages, setRestrictions.AllowedLanguages) {
+		changes = append(changes, restrictions.ChangeAllowedLanguages(setRestrictions.AllowedLanguages))
 	}
 	return changes
 }