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/api/grpc/management/mail_text.go

@@ -0,0 +1,45 @@
+package management
+
+import (
+	"context"
+
+	"github.com/caos/zitadel/pkg/grpc/management"
+	"github.com/golang/protobuf/ptypes/empty"
+)
+
+func (s *Server) GetMailTexts(ctx context.Context, _ *empty.Empty) (*management.MailTextsView, error) {
+	result, err := s.org.GetMailTexts(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return mailTextsViewFromModel(result.Texts), nil
+}
+
+func (s *Server) GetDefaultMailTexts(ctx context.Context, _ *empty.Empty) (*management.MailTextsView, error) {
+	result, err := s.org.GetDefaultMailTexts(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return mailTextsViewFromModel(result.Texts), nil
+}
+
+func (s *Server) CreateMailText(ctx context.Context, mailText *management.MailTextUpdate) (*management.MailText, error) {
+	result, err := s.org.AddMailText(ctx, mailTextRequestToModel(mailText))
+	if err != nil {
+		return nil, err
+	}
+	return mailTextFromModel(result), nil
+}
+
+func (s *Server) UpdateMailText(ctx context.Context, mailText *management.MailTextUpdate) (*management.MailText, error) {
+	result, err := s.org.ChangeMailText(ctx, mailTextRequestToModel(mailText))
+	if err != nil {
+		return nil, err
+	}
+	return mailTextFromModel(result), nil
+}
+
+func (s *Server) RemoveMailText(ctx context.Context, mailText *management.MailTextRemove) (*empty.Empty, error) {
+	err := s.org.RemoveMailText(ctx, mailTextRemoveToModel(mailText))
+	return &empty.Empty{}, err
+}