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/eventsourcing/model/mail_text.go

@@ -0,0 +1,157 @@
+package model
+
+import (
+	"encoding/json"
+
+	"github.com/caos/zitadel/internal/errors"
+	"github.com/caos/zitadel/internal/eventstore/models"
+	es_models "github.com/caos/zitadel/internal/eventstore/models"
+	iam_model "github.com/caos/zitadel/internal/iam/model"
+)
+
+type MailText struct {
+	models.ObjectRoot
+	State        int32 `json:"-"`
+	MailTextType string
+	Language     string
+	Title        string
+	PreHeader    string
+	Subject      string
+	Greeting     string
+	Text         string
+	ButtonText   string
+}
+
+func GetMailText(mailTexts []*MailText, mailTextType string, language string) (int, *MailText) {
+	for i, m := range mailTexts {
+		if m.MailTextType == mailTextType && m.Language == language {
+			return i, m
+		}
+	}
+	return -1, nil
+}
+
+func MailTextsToModel(mailTexts []*MailText) []*iam_model.MailText {
+	convertedMailTexts := make([]*iam_model.MailText, len(mailTexts))
+	for i, m := range mailTexts {
+		convertedMailTexts[i] = MailTextToModel(m)
+	}
+	return convertedMailTexts
+}
+
+func MailTextToModel(mailText *MailText) *iam_model.MailText {
+	return &iam_model.MailText{
+		ObjectRoot:   mailText.ObjectRoot,
+		State:        iam_model.PolicyState(mailText.State),
+		MailTextType: mailText.MailTextType,
+		Language:     mailText.Language,
+		Title:        mailText.Title,
+		PreHeader:    mailText.PreHeader,
+		Subject:      mailText.Subject,
+		Greeting:     mailText.Greeting,
+		Text:         mailText.Text,
+		ButtonText:   mailText.ButtonText,
+	}
+}
+
+func MailTextsFromModel(mailTexts []*iam_model.MailText) []*MailText {
+	convertedMailTexts := make([]*MailText, len(mailTexts))
+	for i, m := range mailTexts {
+		convertedMailTexts[i] = MailTextFromModel(m)
+	}
+	return convertedMailTexts
+}
+
+func MailTextFromModel(mailText *iam_model.MailText) *MailText {
+	return &MailText{
+		ObjectRoot:   mailText.ObjectRoot,
+		State:        int32(mailText.State),
+		MailTextType: mailText.MailTextType,
+		Language:     mailText.Language,
+		Title:        mailText.Title,
+		PreHeader:    mailText.PreHeader,
+		Subject:      mailText.Subject,
+		Greeting:     mailText.Greeting,
+		Text:         mailText.Text,
+		ButtonText:   mailText.ButtonText,
+	}
+}
+
+func (p *MailText) Changes(changed *MailText) map[string]interface{} {
+	changes := make(map[string]interface{}, 8)
+
+	changes["mailTextType"] = changed.MailTextType
+
+	changes["language"] = changed.Language
+
+	if changed.Title != p.Title {
+		changes["title"] = changed.Title
+	}
+
+	if changed.PreHeader != p.PreHeader {
+		changes["preHeader"] = changed.PreHeader
+	}
+
+	if changed.Subject != p.Subject {
+		changes["subject"] = changed.Subject
+	}
+
+	if changed.Greeting != p.Greeting {
+		changes["greeting"] = changed.Greeting
+	}
+
+	if changed.Text != p.Text {
+		changes["text"] = changed.Text
+	}
+
+	if changed.ButtonText != p.ButtonText {
+		changes["buttonText"] = changed.ButtonText
+	}
+
+	return changes
+}
+
+func (i *IAM) appendAddMailTextEvent(event *es_models.Event) error {
+	mailText := &MailText{}
+	err := mailText.SetDataLabel(event)
+	if err != nil {
+		return err
+	}
+	mailText.ObjectRoot.CreationDate = event.CreationDate
+	i.DefaultMailTexts = append(i.DefaultMailTexts, mailText)
+	return nil
+}
+
+func (i *IAM) appendChangeMailTextEvent(event *es_models.Event) error {
+	mailText := &MailText{}
+	err := mailText.SetDataLabel(event)
+	if err != nil {
+		return err
+	}
+	if n, m := GetMailText(i.DefaultMailTexts, mailText.MailTextType, mailText.Language); m != nil {
+		i.DefaultMailTexts[n] = mailText
+	}
+	return nil
+}
+
+func (i *IAM) appendRemoveMailTextEvent(event *es_models.Event) error {
+	mailText := &MailText{}
+	err := mailText.SetDataLabel(event)
+	if err != nil {
+		return err
+	}
+	if n, m := GetMailText(i.DefaultMailTexts, mailText.MailTextType, mailText.Language); m != nil {
+		i.DefaultMailTexts[n] = i.DefaultMailTexts[len(i.DefaultMailTexts)-1]
+		i.DefaultMailTexts[len(i.DefaultMailTexts)-1] = nil
+		i.DefaultMailTexts = i.DefaultMailTexts[:len(i.DefaultMailTexts)-1]
+	}
+	return nil
+}
+
+func (p *MailText) SetDataLabel(event *es_models.Event) error {
+	err := json.Unmarshal(event.Data, p)
+	if err != nil {
+		return errors.ThrowInternal(err, "MODEL-3FUV5", "unable to unmarshal data")
+	}
+	return nil
+}