feat: Custom message files (#1992)

* feat: add get custom message text to admin api

* feat: read custom message texts from files

* feat: get languages in apis

* feat: get languages in apis

* feat: get languages in apis

* feat: pr feedback

* feat: docs

* feat: merge main

internal/notification/repository/eventsourcing/handler/custom_text.go

@@ -0,0 +1,125 @@
+package handler
+
+import (
+	"github.com/caos/logging"
+	caos_errs "github.com/caos/zitadel/internal/errors"
+	"github.com/caos/zitadel/internal/eventstore/v1"
+	es_models "github.com/caos/zitadel/internal/eventstore/v1/models"
+	"github.com/caos/zitadel/internal/eventstore/v1/query"
+	"github.com/caos/zitadel/internal/eventstore/v1/spooler"
+	iam_es_model "github.com/caos/zitadel/internal/iam/repository/eventsourcing/model"
+	iam_model "github.com/caos/zitadel/internal/iam/repository/view/model"
+	"github.com/caos/zitadel/internal/org/repository/eventsourcing/model"
+)
+
+type CustomText struct {
+	handler
+	subscription *v1.Subscription
+}
+
+func newCustomText(handler handler) *CustomText {
+	h := &CustomText{
+		handler: handler,
+	}
+
+	h.subscribe()
+
+	return h
+}
+
+func (m *CustomText) subscribe() {
+	m.subscription = m.es.Subscribe(m.AggregateTypes()...)
+	go func() {
+		for event := range m.subscription.Events {
+			query.ReduceEvent(m, event)
+		}
+	}()
+}
+
+const (
+	customTextTable = "notification.custom_texts"
+)
+
+func (m *CustomText) ViewModel() string {
+	return customTextTable
+}
+
+func (m *CustomText) Subscription() *v1.Subscription {
+	return m.subscription
+}
+
+func (_ *CustomText) AggregateTypes() []es_models.AggregateType {
+	return []es_models.AggregateType{model.OrgAggregate, iam_es_model.IAMAggregate}
+}
+
+func (p *CustomText) CurrentSequence() (uint64, error) {
+	sequence, err := p.view.GetLatestCustomTextSequence()
+	if err != nil {
+		return 0, err
+	}
+	return sequence.CurrentSequence, nil
+}
+
+func (m *CustomText) EventQuery() (*es_models.SearchQuery, error) {
+	sequence, err := m.view.GetLatestCustomTextSequence()
+	if err != nil {
+		return nil, err
+	}
+	return es_models.NewSearchQuery().
+		AggregateTypeFilter(m.AggregateTypes()...).
+		LatestSequenceFilter(sequence.CurrentSequence), nil
+}
+
+func (m *CustomText) Reduce(event *es_models.Event) (err error) {
+	switch event.AggregateType {
+	case model.OrgAggregate, iam_es_model.IAMAggregate:
+		err = m.processCustomText(event)
+	}
+	return err
+}
+
+func (m *CustomText) processCustomText(event *es_models.Event) (err error) {
+	customText := new(iam_model.CustomTextView)
+	switch event.Type {
+	case iam_es_model.CustomTextSet, model.CustomTextSet:
+		text := new(iam_model.CustomTextView)
+		err = text.SetData(event)
+		if err != nil {
+			return err
+		}
+		customText, err = m.view.CustomTextByIDs(event.AggregateID, text.Template, text.Key, text.Language)
+		if err != nil && !caos_errs.IsNotFound(err) {
+			return err
+		}
+		if caos_errs.IsNotFound(err) {
+			err = nil
+			customText = new(iam_model.CustomTextView)
+			customText.Language = text.Language
+			customText.Template = text.Template
+			customText.CreationDate = event.CreationDate
+		}
+		err = customText.AppendEvent(event)
+	case iam_es_model.CustomTextRemoved, model.CustomTextRemoved:
+		text := new(iam_model.CustomTextView)
+		err = text.SetData(event)
+		if err != nil {
+			return err
+		}
+		return m.view.DeleteCustomText(event.AggregateID, text.Template, text.Language, event)
+	default:
+		return m.view.ProcessedCustomTextSequence(event)
+	}
+	if err != nil {
+		return err
+	}
+	return m.view.PutCustomText(customText, event)
+}
+
+func (m *CustomText) OnError(event *es_models.Event, err error) error {
+	logging.LogWithFields("SPOOL-3m912", "id", event.AggregateID).WithError(err).Warn("something went wrong in custom text handler")
+	return spooler.HandleError(event, err, m.view.GetLatestCustomTextFailedEvent, m.view.ProcessedCustomTextFailedEvent, m.view.ProcessedCustomTextSequence, m.errorCountUntilSkip)
+}
+
+func (o *CustomText) OnSuccess() error {
+	return spooler.HandleSuccess(o.view.UpdateCustomTextSpoolerRunTimestamp)
+}