how to check if a user has the permission to broadcast message to a channel?

[Yxue-1906]

if find although the user is the creator of the channel, chatPermission in chat object returned by getChat indicates the user has no right to send message.

part of the log

[ 3][t 1][1678353734.471293687][Td.cpp:2923][!Td][&td_requests] Receive request 17: getChat {
  chat_id = ***4402
}
[ 3][t 1][1678353734.471417903][MessagesManager.cpp:35006][!GetChatRequest] Search for server message 146 in chat ***4402 found 0xaaaaf2c19c30
[ 3][t 1][1678353734.471545219][Td.cpp:3980][!Td][&td_requests] Sending result for request 17: chat {
  id = ***4402
  type = chatTypeSupergroup {
    supergroup_id = ***4402
    is_channel = true
  }
  title = "test"
  photo = null
  permissions = chatPermissions {
    can_send_messages = false
    can_send_media_messages = false
    can_send_polls = false
    can_send_other_messages = false
    can_add_web_page_previews = false
    can_change_info = false
    can_invite_users = false
    can_pin_messages = false
    can_manage_topics = false
  }
  ...
[ 3][t 1][1678353819.953547954][Td.cpp:2923][!Td][&td_requests] Receive request 18: getSupergroup {
  supergroup_id = ***4402
}
[ 3][t 1][1678353819.953650951][Td.cpp:3980][!Td][&td_requests] Sending result for request 18: supergroup {
  id = ***4402
  usernames = null
  date = 1642844800
  status = chatMemberStatusCreator {
    custom_title = ""
    is_anonymous = false
    is_member = true
  }
  member_count = 2
  has_linked_chat = true
  has_location = false
  sign_messages = false
  join_to_send_messages = true
  join_by_request = false
  is_slow_mode_enabled = false
  is_channel = true
  is_broadcast_group = false
  is_forum = false
  is_verified = false
  restriction_reason = ""
  is_scam = false
  is_fake = false
}

[AYMENJD]

The permissions in chat.permissions is for non-administrator members. If you want to check permissions for a single user you must use getChatMember.

chat.permissions: https://github.com/tdlib/td/blob/1543c41f3411bd6aa74713c8aba4e93fa8d952c7/td/generate/scheme/td_api.tl#L1318

[Yxue-1906]

The permissions in chat.permissions is for non-administrator members. If you want to check permissions for a single user you must use getChatMember.

chat.permissions:

https://github.com/tdlib/td/blob/1543c41f3411bd6aa74713c8aba4e93fa8d952c7/td/generate/scheme/td_api.tl#L1318

okay, got it. thx for your reply.

[levlam]

For self you can also check that supergroup.status is chatMemberStatusCreator, or it is chatMemberStatusAdministrator and status.rights.can_post_messages == true.