feat: e-mail templates (#1158)

* View definition added

* Get templates and texts from the database.

* Fill in texts in templates

* Fill in texts in templates

* Client API added

* Weekly backup

* Weekly backup

* Daily backup

* Weekly backup

* Tests added

* Corrections from merge branch

* Fixes from pull request review

internal/iam/repository/view/model/mail_template.go

@@ -0,0 +1,80 @@
+package model
+
+import (
+	"encoding/json"
+	"time"
+
+	org_es_model "github.com/caos/zitadel/internal/org/repository/eventsourcing/model"
+
+	es_model "github.com/caos/zitadel/internal/iam/repository/eventsourcing/model"
+
+	"github.com/caos/logging"
+	caos_errs "github.com/caos/zitadel/internal/errors"
+	"github.com/caos/zitadel/internal/eventstore/models"
+	"github.com/caos/zitadel/internal/iam/model"
+)
+
+const (
+	MailTemplateKeyAggregateID = "aggregate_id"
+)
+
+type MailTemplateView struct {
+	AggregateID  string    `json:"-" gorm:"column:aggregate_id;primary_key"`
+	CreationDate time.Time `json:"-" gorm:"column:creation_date"`
+	ChangeDate   time.Time `json:"-" gorm:"column:change_date"`
+	State        int32     `json:"-" gorm:"column:mail_template_state"`
+
+	Template []byte `json:"template" gorm:"column:template"`
+	Default  bool   `json:"-" gorm:"-"`
+
+	Sequence uint64 `json:"-" gorm:"column:sequence"`
+}
+
+func MailTemplateViewFromModel(template *model.MailTemplateView) *MailTemplateView {
+	return &MailTemplateView{
+		AggregateID:  template.AggregateID,
+		Sequence:     template.Sequence,
+		CreationDate: template.CreationDate,
+		ChangeDate:   template.ChangeDate,
+		Template:     template.Template,
+		Default:      template.Default,
+	}
+}
+
+func MailTemplateViewToModel(template *MailTemplateView) *model.MailTemplateView {
+	return &model.MailTemplateView{
+		AggregateID:  template.AggregateID,
+		Sequence:     template.Sequence,
+		CreationDate: template.CreationDate,
+		ChangeDate:   template.ChangeDate,
+		Template:     template.Template,
+		Default:      template.Default,
+	}
+}
+
+func (i *MailTemplateView) AppendEvent(event *models.Event) (err error) {
+	i.Sequence = event.Sequence
+	i.ChangeDate = event.CreationDate
+	switch event.Type {
+	case es_model.MailTemplateAdded, org_es_model.MailTemplateAdded:
+		i.setRootData(event)
+		i.CreationDate = event.CreationDate
+		err = i.SetData(event)
+	case es_model.MailTemplateChanged, org_es_model.MailTemplateChanged:
+		i.ChangeDate = event.CreationDate
+		err = i.SetData(event)
+	}
+	return err
+}
+
+func (r *MailTemplateView) setRootData(event *models.Event) {
+	r.AggregateID = event.AggregateID
+}
+
+func (r *MailTemplateView) SetData(event *models.Event) error {
+	if err := json.Unmarshal(event.Data, r); err != nil {
+		logging.Log("MODEL-YDZmZ").WithError(err).Error("could not unmarshal event data")
+		return caos_errs.ThrowInternal(err, "MODEL-sKWwO", "Could not unmarshal data")
+	}
+	return nil
+}