fix_: add method to retrieve prepared message (#5102)

* Add Test_WHEN_MessageContainsImage_THEN_PreparedMessageByIDContainsLink
* Add Messenger.PreparedMessageByID call
fixes #13684

protocol/messenger.go

@@ -4197,7 +4197,17 @@ func (m *Messenger) storeSyncBookmarks(bookmarkMap map[string]*browsers.Bookmark
 }
 
 func (m *Messenger) MessageByID(id string) (*common.Message, error) {
-	return m.persistence.MessageByID(id)
+	msg, err := m.persistence.MessageByID(id)
+	if err != nil {
+		return nil, err
+	}
+	if m.httpServer != nil {
+		err = m.prepareMessage(msg, m.httpServer)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return msg, nil
 }
 
 func (m *Messenger) MessagesExist(ids []string) (map[string]bool, error) {

protocol/persistence_quoted_message_test.go

@@ -3,6 +3,7 @@ package protocol
 import (
 	"encoding/json"
 	"fmt"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/suite"
@@ -198,3 +199,30 @@ func (s *TestMessengerPrepareMessageSuite) Test_WHEN_QuotedMessageDoesNotContain
 
 	s.Require().Equal(json.RawMessage(nil), retrievedMessages[0].QuotedMessage.AlbumImages)
 }
+
+func (s *TestMessengerPrepareMessageSuite) Test_WHEN_MessageContainsImage_THEN_PreparedMessageByIDContainsLink() {
+	// GIVEN: message with image saved to DB
+	message := s.generateTextMessage("id-1", "1", 1, "")
+	message.ContentType = protobuf.ChatMessage_IMAGE
+	message.Payload = &protobuf.ChatMessage_Image{
+		Image: &protobuf.ImageMessage{
+			Format:  1,
+			Payload: RandomBytes(100),
+		},
+	}
+
+	err := s.m.SaveMessages([]*common.Message{message})
+	s.Require().NoError(err)
+
+	mediaServer, err := server.NewMediaServer(s.m.database, nil, nil, nil)
+	s.Require().NoError(err)
+	s.Require().NoError(mediaServer.Start())
+	s.m.httpServer = mediaServer
+
+	// WHEN: message is prepared
+	loadedMessage, err := s.m.MessageByID(message.ID)
+	s.Require().NoError(err)
+
+	// THEN: message contains image link
+	s.Require().True(strings.HasPrefix(loadedMessage.ImageLocalURL, "https://Localhost"))
+}