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/iam/model/message_text_view.go

@@ -8,10 +8,6 @@ import (
 	"github.com/caos/zitadel/internal/domain"
 )
 
-type MessageTextsView struct {
-	Texts   []*MessageTextView
-	Default bool
-}
 type MessageTextView struct {
 	AggregateID     string
 	MessageTextType string

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

@@ -110,6 +110,46 @@ func (r *CustomTextView) IsMessageTemplate() bool {
 		r.Template == domain.DomainClaimedMessageType
 }
 
+func CustomTextViewsToMessageDomain(aggregateID, lang string, texts []*CustomTextView) *domain.CustomMessageText {
+	langTag := language.Make(lang)
+	result := &domain.CustomMessageText{
+		ObjectRoot: models.ObjectRoot{
+			AggregateID: aggregateID,
+		},
+		Language: langTag,
+	}
+	for _, text := range texts {
+		if text.CreationDate.Before(result.CreationDate) {
+			result.CreationDate = text.CreationDate
+		}
+		if text.ChangeDate.After(result.ChangeDate) {
+			result.ChangeDate = text.ChangeDate
+		}
+		if text.Key == domain.MessageTitle {
+			result.Title = text.Text
+		}
+		if text.Key == domain.MessagePreHeader {
+			result.PreHeader = text.Text
+		}
+		if text.Key == domain.MessageSubject {
+			result.Subject = text.Text
+		}
+		if text.Key == domain.MessageGreeting {
+			result.Greeting = text.Text
+		}
+		if text.Key == domain.MessageText {
+			result.Text = text.Text
+		}
+		if text.Key == domain.MessageButtonText {
+			result.ButtonText = text.Text
+		}
+		if text.Key == domain.MessageFooterText {
+			result.FooterText = text.Text
+		}
+	}
+	return result
+}
+
 func CustomTextViewsToLoginDomain(aggregateID, lang string, texts []*CustomTextView) *domain.CustomLoginText {
 	langTag := language.Make(lang)
 	result := &domain.CustomLoginText{

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

@@ -59,12 +59,6 @@ func MessageTextViewFromModel(template *model.MessageTextView) *MessageTextView
 	}
 }
 
-func MessageTextsViewToModel(textsIn []*MessageTextView, defaultIn bool) *model.MessageTextsView {
-	return &model.MessageTextsView{
-		Texts: messageTextsViewToModelArr(textsIn, defaultIn),
-	}
-}
-
 func messageTextsViewToModelArr(texts []*MessageTextView, defaultIn bool) []*model.MessageTextView {
 	result := make([]*model.MessageTextView, len(texts))
 	for i, r := range texts {