Support media timestamp in message links.

td/generate/scheme/td_api.tl

@@ -3119,9 +3119,10 @@ messageLink link:string is_public:Bool = MessageLink;
 //@is_public True, if the link is a public link for a message in a chat
 //@chat_id If found, identifier of the chat to which the message belongs, 0 otherwise
 //@message If found, the linked message; may be null
+//@media_timestamp Timestamp from which the video/audio/video note/voice note playing should start, in seconds; 0 if not specified
 //@for_album True, if the whole media album to which the message belongs is linked
 //@for_comment True, if the message is linked as a channel post comment or from a message thread
-messageLinkInfo is_public:Bool chat_id:int53 message:message for_album:Bool for_comment:Bool = MessageLinkInfo;
+messageLinkInfo is_public:Bool chat_id:int53 message:message media_timestamp:int32 for_album:Bool for_comment:Bool = MessageLinkInfo;
 
 
 //@description Contains a part of a file @data File bytes

td/telegram/LinkManager.cpp

@@ -1125,6 +1125,7 @@ Result<MessageLinkInfo> LinkManager::get_message_link_info(Slice url) {
   Slice channel_id_slice;
   Slice message_id_slice;
   Slice comment_message_id_slice = "0";
+  Slice media_timestamp_slice;
   bool is_single = false;
   bool for_comment = false;
   if (link_info.is_tg_) {
@@ -1167,6 +1168,9 @@ Result<MessageLinkInfo> LinkManager::get_message_link_info(Slice url) {
           message_id_slice = key_value.second;
         }
       }
+      if (key_value.first == "t") {
+        media_timestamp_slice = key_value.second;
+      }
       if (key_value.first == "single") {
         is_single = true;
       }
@@ -1206,6 +1210,9 @@ Result<MessageLinkInfo> LinkManager::get_message_link_info(Slice url) {
       auto args = full_split(url.substr(query_pos + 1), '&');
       for (auto arg : args) {
         auto key_value = split(arg, '=');
+        if (key_value.first == "t") {
+          media_timestamp_slice = key_value.second;
+        }
         if (key_value.first == "single") {
           is_single = true;
         }
@@ -1239,11 +1246,49 @@ Result<MessageLinkInfo> LinkManager::get_message_link_info(Slice url) {
     return Status::Error("Wrong comment message ID");
   }
 
+  bool is_media_timestamp_invalid = false;
+  int32 media_timestamp = 0;
+  const int32 MAX_MEDIA_TIMESTAMP = 10000000;
+  if (!media_timestamp_slice.empty()) {
+    int32 current_value = 0;
+    for (size_t i = 0; i <= media_timestamp_slice.size(); i++) {
+      auto c = i < media_timestamp_slice.size() ? media_timestamp_slice[i] : 's';
+      if ('0' <= c && c <= '9') {
+        current_value = current_value * 10 + c - '0';
+        if (current_value > MAX_MEDIA_TIMESTAMP) {
+          is_media_timestamp_invalid = true;
+          break;
+        }
+      } else {
+        auto mul = 0;
+        switch (to_lower(c)) {
+          case 'h':
+            mul = 3600;
+            break;
+          case 'm':
+            mul = 60;
+            break;
+          case 's':
+            mul = 1;
+            break;
+        }
+        if (mul == 0 || current_value > MAX_MEDIA_TIMESTAMP / mul ||
+            media_timestamp + current_value * mul > MAX_MEDIA_TIMESTAMP) {
+          is_media_timestamp_invalid = true;
+          break;
+        }
+        media_timestamp += current_value * mul;
+        current_value = 0;
+      }
+    }
+  }
+
   MessageLinkInfo info;
   info.username = username.str();
   info.channel_id = channel_id;
   info.message_id = MessageId(ServerMessageId(r_message_id.ok()));
   info.comment_message_id = MessageId(ServerMessageId(r_comment_message_id.ok()));
+  info.media_timestamp = is_media_timestamp_invalid ? 0 : media_timestamp;
   info.is_single = is_single;
   info.for_comment = for_comment;
   LOG(INFO) << "Have link to " << info.message_id << " in chat @" << info.username << "/" << channel_id.get();

td/telegram/MessageContentType.cpp

@@ -335,4 +335,9 @@ bool can_have_message_content_caption(MessageContentType content_type) {
   }
 }
 
+bool can_have_media_timestamp(MessageContentType content_type) {
+  return content_type == MessageContentType::Audio || content_type == MessageContentType::Video ||
+         content_type == MessageContentType::VideoNote || content_type == MessageContentType::VoiceNote;
+}
+
 }  // namespace td

td/telegram/MessageContentType.h

@@ -75,6 +75,8 @@ bool is_service_message_content(MessageContentType content_type);
 
 bool can_have_message_content_caption(MessageContentType content_type);
 
+bool can_have_media_timestamp(MessageContentType content_type);
+
 struct MessageContentTypeHash {
   std::size_t operator()(MessageContentType content_type) const {
     return std::hash<int32>()(static_cast<int32>(content_type));

td/telegram/MessageLinkInfo.h

@@ -21,6 +21,7 @@ struct MessageLinkInfo {
 
   MessageId message_id;
   bool is_single = false;
+  int32 media_timestamp = 0;
 
   DialogId comment_dialog_id;
   MessageId comment_message_id;

td/telegram/MessagesManager.cpp

@@ -17545,6 +17545,7 @@ td_api::object_ptr<td_api::messageLinkInfo> MessagesManager::get_message_link_in
                            : (is_public ? resolve_dialog_username(info.username) : DialogId(info.channel_id));
   MessageId message_id = info.comment_dialog_id.is_valid() ? info.comment_message_id : info.message_id;
   td_api::object_ptr<td_api::message> message;
+  int32 media_timestamp = 0;
   bool for_album = false;
   bool for_comment = false;
 
@@ -17557,11 +17558,17 @@ td_api::object_ptr<td_api::messageLinkInfo> MessagesManager::get_message_link_in
       message = get_message_object(dialog_id, m);
       for_album = !info.is_single && m->media_album_id != 0;
       for_comment = (info.comment_dialog_id.is_valid() || info.for_comment) && m->top_thread_message_id.is_valid();
+      if (can_have_media_timestamp(m->content->get_type())) {
+        auto duration = get_message_content_duration(m->content.get(), td_);
+        if (duration == 0 || info.media_timestamp <= duration) {
+          media_timestamp = info.media_timestamp;
+        }
+      }
     }
   }
 
-  return td_api::make_object<td_api::messageLinkInfo>(is_public, dialog_id.get(), std::move(message), for_album,
-                                                      for_comment);
+  return td_api::make_object<td_api::messageLinkInfo>(is_public, dialog_id.get(), std::move(message), media_timestamp,
+                                                      for_album, for_comment);
 }
 
 InputDialogId MessagesManager::get_input_dialog_id(DialogId dialog_id) const {