Add get_individual_message_contents.

td/telegram/MessageContent.cpp

@@ -2759,6 +2759,14 @@ unique_ptr<MessageContent> create_text_message_content(string text, vector<Messa
                                       force_small_media, force_large_media, skip_confirmation, std::move(web_page_url));
 }
 
+unique_ptr<MessageContent> create_photo_message_content(Photo photo) {
+  return make_unique<MessagePhoto>(std::move(photo), FormattedText(), false);
+}
+
+unique_ptr<MessageContent> create_video_message_content(FileId file_id) {
+  return make_unique<MessageVideo>(file_id, FormattedText(), false);
+}
+
 unique_ptr<MessageContent> create_contact_registered_message_content() {
   return make_unique<MessageContactRegistered>();
 }
@@ -4333,6 +4341,12 @@ int32 get_message_content_index_mask(const MessageContent *content, const Td *td
   return get_message_content_text_index_mask(content) | get_message_content_media_index_mask(content, td, is_outgoing);
 }
 
+vector<unique_ptr<MessageContent>> get_individual_message_contents(const MessageContent *content) {
+  CHECK(content->get_type() == MessageContentType::PaidMedia);
+  const auto *m = static_cast<const MessagePaidMedia *>(content);
+  return transform(m->media, [](const MessageExtendedMedia &media) { return media.get_message_content(); });
+}
+
 StickerType get_message_content_sticker_type(const Td *td, const MessageContent *content) {
   CHECK(content->get_type() == MessageContentType::Sticker);
   return td->stickers_manager_->get_sticker_type(static_cast<const MessageSticker *>(content)->file_id);
@@ -6839,7 +6853,7 @@ unique_ptr<MessageContent> dup_message_content(Td *td, DialogId dialog_id, const
       }
       if (type != MessageContentDupType::Forward) {
         for (auto &media : result->media) {
-          media = media.dup_to_send(td, result->media.size() > 1u);
+          media = media.dup_to_send(td, true);
           CHECK(!media.is_empty());
         }
       }

td/telegram/MessageContent.h

@@ -105,6 +105,10 @@ unique_ptr<MessageContent> create_text_message_content(string text, vector<Messa
                                                        bool force_large_media, bool skip_confitmation,
                                                        string &&web_page_url);
 
+unique_ptr<MessageContent> create_photo_message_content(Photo photo);
+
+unique_ptr<MessageContent> create_video_message_content(FileId file_id);
+
 unique_ptr<MessageContent> create_contact_registered_message_content();
 
 unique_ptr<MessageContent> create_screenshot_taken_message_content();
@@ -157,6 +161,8 @@ bool update_opened_message_content(MessageContent *content);
 
 int32 get_message_content_index_mask(const MessageContent *content, const Td *td, bool is_outgoing);
 
+vector<unique_ptr<MessageContent>> get_individual_message_contents(const MessageContent *content);
+
 StickerType get_message_content_sticker_type(const Td *td, const MessageContent *content);
 
 MessageId get_message_content_pinned_message_id(const MessageContent *content);

td/telegram/MessageExtendedMedia.cpp

@@ -12,6 +12,7 @@
 #include "td/telegram/DocumentsManager.h"
 #include "td/telegram/files/FileManager.h"
 #include "td/telegram/files/FileType.h"
+#include "td/telegram/MessageContent.h"
 #include "td/telegram/Photo.h"
 #include "td/telegram/PhotoSize.h"
 #include "td/telegram/StickersManager.h"
@@ -258,6 +259,21 @@ void MessageExtendedMedia::delete_thumbnail(Td *td) {
   }
 }
 
+unique_ptr<MessageContent> MessageExtendedMedia::get_message_content() const {
+  switch (type_) {
+    case Type::Photo:
+      return create_photo_message_content(photo_);
+    case Type::Video:
+      return create_video_message_content(video_file_id_);
+    case Type::Empty:
+    case Type::Unsupported:
+    case Type::Preview:
+    default:
+      UNREACHABLE();
+      return nullptr;
+  }
+}
+
 int32 MessageExtendedMedia::get_duration(const Td *td) const {
   if (!has_media_timestamp()) {
     return -1;

td/telegram/MessageExtendedMedia.h

@@ -18,6 +18,8 @@
 
 namespace td {
 
+class MessageContent;
+
 class Td;
 
 class MessageExtendedMedia {
@@ -92,6 +94,8 @@ class MessageExtendedMedia {
 
   bool is_equal_but_different(const MessageExtendedMedia &other) const;
 
+  unique_ptr<MessageContent> get_message_content() const;
+
   int32 get_duration(const Td *td) const;
 
   FileId get_upload_file_id() const;