Add td_api::checkChatUsername.

GitOrigin-RevId: 290255ad825b08484657e08bab5ffab70c61afde

td/generate/scheme/td_api.tl

@@ -1464,6 +1464,24 @@ wallpapers wallpapers:vector<wallpaper> = Wallpapers;
 hashtags hashtags:vector<string> = Hashtags;
 
 
+//@class CheckChatUsernameResult @description Represents result of checking whether a username can be set for a chat
+
+//@description The username can be set
+checkChatUsernameResultOk = CheckChatUsernameResult;
+
+//@description The username is invalid
+checkChatUsernameResultUsernameInvalid = CheckChatUsernameResult;
+
+//@description The username is occupied
+checkChatUsernameResultUsernameOccupied = CheckChatUsernameResult;
+
+//@description The user has too much public chats, one of them should be made private first
+checkChatUsernameResultPublicChatsTooMuch = CheckChatUsernameResult;
+
+//@description The user can't be a member of a public supergroup
+checkChatUsernameResultPublicGroupsUnavailable = CheckChatUsernameResult;
+
+
 //@class OptionValue @description Represents the value of an option
 
 //@description Boolean option @value The value of the option
@@ -2100,13 +2118,17 @@ removeRecentlyFoundChat chat_id:int53 = Ok;
 //@description Clears the list of recently found chats
 clearRecentlyFoundChats = Ok;
 
-//@description Returns a list of common chats with a given user. Chats are sorted by their type and creation date @user_id User identifier @offset_chat_id Chat identifier starting from which to return chats; use 0 for the first request @limit Maximum number of chats to be returned; up to 100
+//@description Checks whether a username can be set for a chat @chat_id Chat identifier; should be identifier of a supergroup chat, or a channel chat, or a private chat with self, or zero if chat is being created @username Username to be checked
-getGroupsInCommon user_id:int32 offset_chat_id:int53 limit:int32 = Chats;
+checkChatUsername chat_id:int64 username:string = CheckChatUsernameResult;
 
 //@description Returns a list of public chats created by the user
 getCreatedPublicChats = Chats;
 
 
+//@description Returns a list of common chats with a given user. Chats are sorted by their type and creation date @user_id User identifier @offset_chat_id Chat identifier starting from which to return chats; use 0 for the first request @limit Maximum number of chats to be returned; up to 100
+getGroupsInCommon user_id:int32 offset_chat_id:int53 limit:int32 = Chats;
+
+
 //@description Returns messages in a chat. The messages are returned in a reverse chronological order (i.e., in order of decreasing message_id).
 //-For optimal performance the number of returned messages is chosen by the library. This is an offline request if only_local is true
 //@chat_id Chat identifier
@@ -2621,7 +2643,7 @@ disconnectAllWebsites = Ok;
 toggleBasicGroupAdministrators basic_group_id:int32 everyone_is_administrator:Bool = Ok;
 
 
-//@description Changes the username of the supergroup or channel, requires creator privileges in the supergroup or channel @supergroup_id Identifier of the supergroup or channel @username New value of the username. Use an empty string to remove the username
+//@description Changes the username of a supergroup or channel, requires creator privileges in the supergroup or channel @supergroup_id Identifier of the supergroup or channel @username New value of the username. Use an empty string to remove the username
 setSupergroupUsername supergroup_id:int32 username:string = Ok;
 
 //@description Changes the sticker set of a supergroup; requires appropriate rights in the supergroup @supergroup_id Identifier of the supergroup @sticker_set_id New value of the supergroup sticker set identifier. Use 0 to remove the supergroup sticker set

td/telegram/ContactsManager.cpp

@@ -768,6 +768,31 @@ class UpdateProfileQuery : public Td::ResultHandler {
   }
 };
 
+class CheckUsernameQuery : public Td::ResultHandler {
+  Promise<bool> promise_;
+
+ public:
+  explicit CheckUsernameQuery(Promise<bool> &&promise) : promise_(std::move(promise)) {
+  }
+
+  void send(const string &username) {
+    send_query(G()->net_query_creator().create(create_storer(telegram_api::account_checkUsername(username))));
+  }
+
+  void on_result(uint64 id, BufferSlice packet) override {
+    auto result_ptr = fetch_result<telegram_api::account_checkUsername>(packet);
+    if (result_ptr.is_error()) {
+      return on_error(id, result_ptr.move_as_error());
+    }
+
+    promise_.set_value(result_ptr.move_as_ok());
+  }
+
+  void on_error(uint64 id, Status status) override {
+    promise_.set_error(std::move(status));
+  }
+};
+
 class UpdateUsernameQuery : public Td::ResultHandler {
   Promise<Unit> promise_;
 
@@ -833,6 +858,45 @@ class ToggleChatAdminsQuery : public Td::ResultHandler {
   }
 };
 
+class CheckChannelUsernameQuery : public Td::ResultHandler {
+  Promise<bool> promise_;
+  ChannelId channel_id_;
+  string username_;
+
+ public:
+  explicit CheckChannelUsernameQuery(Promise<bool> &&promise) : promise_(std::move(promise)) {
+  }
+
+  void send(ChannelId channel_id, const string &username) {
+    channel_id_ = channel_id;
+    tl_object_ptr<telegram_api::InputChannel> input_channel;
+    if (channel_id.is_valid()) {
+      input_channel = td->contacts_manager_->get_input_channel(channel_id);
+    } else {
+      input_channel = make_tl_object<telegram_api::inputChannelEmpty>();
+    }
+    CHECK(input_channel != nullptr);
+    send_query(G()->net_query_creator().create(
+        create_storer(telegram_api::channels_checkUsername(std::move(input_channel), username))));
+  }
+
+  void on_result(uint64 id, BufferSlice packet) override {
+    auto result_ptr = fetch_result<telegram_api::channels_checkUsername>(packet);
+    if (result_ptr.is_error()) {
+      return on_error(id, result_ptr.move_as_error());
+    }
+
+    promise_.set_value(result_ptr.move_as_ok());
+  }
+
+  void on_error(uint64 id, Status status) override {
+    if (channel_id_.is_valid()) {
+      td->contacts_manager_->on_get_channel_error(channel_id_, status, "CheckChannelUsernameQuery");
+    }
+    promise_.set_error(std::move(status));
+  }
+};
+
 class UpdateChannelUsernameQuery : public Td::ResultHandler {
   Promise<Unit> promise_;
   ChannelId channel_id_;
@@ -3026,6 +3090,105 @@ void ContactsManager::set_my_online_status(bool is_online, bool send_update) {
   }
 }
 
+void ContactsManager::check_dialog_username(DialogId dialog_id, const string &username,
+                                            Promise<CheckDialogUsernameResult> &&promise) {
+  if (dialog_id != DialogId() && !td_->messages_manager_->have_dialog_force(dialog_id)) {
+    return promise.set_error(Status::Error(3, "Chat not found"));
+  }
+
+  switch (dialog_id.get_type()) {
+    case DialogType::User: {
+      if (dialog_id.get_user_id() != get_my_id("check_dialog_username")) {
+        return promise.set_error(Status::Error(3, "Can't check username for private chat with other user"));
+      }
+      break;
+    }
+    case DialogType::Channel: {
+      auto c = get_channel(dialog_id.get_channel_id());
+      if (c == nullptr) {
+        return promise.set_error(Status::Error(6, "Chat not found"));
+      }
+      if (!get_channel_status(c).is_creator()) {
+        return promise.set_error(Status::Error(6, "Not enough rights to change username"));
+      }
+
+      if (username == c->username) {
+        return promise.set_value(CheckDialogUsernameResult::Ok);
+      }
+      break;
+    }
+    case DialogType::None:
+      break;
+    case DialogType::Chat:
+    case DialogType::SecretChat:
+      if (username.empty()) {
+        return promise.set_value(CheckDialogUsernameResult::Ok);
+      }
+      return promise.set_error(Status::Error(3, "Chat can't have username"));
+    default:
+      UNREACHABLE();
+      return;
+  }
+
+  if (username.empty()) {
+    return promise.set_value(CheckDialogUsernameResult::Ok);
+  }
+  if (!is_valid_username(username)) {
+    return promise.set_value(CheckDialogUsernameResult::Invalid);
+  }
+
+  auto request_promise = PromiseCreator::lambda([promise = std::move(promise)](Result<bool> result) mutable {
+    if (result.is_error()) {
+      auto error = result.move_as_error();
+      if (error.message() == "CHANNEL_PUBLIC_GROUP_NA") {
+        return promise.set_value(CheckDialogUsernameResult::PublicGroupsUnavailable);
+      }
+      if (error.message() == "CHANNELS_ADMIN_PUBLIC_TOO_MUCH") {
+        return promise.set_value(CheckDialogUsernameResult::PublicDialogsTooMuch);
+      }
+      if (error.message() == "USERNAME_INVALID") {
+        return promise.set_value(CheckDialogUsernameResult::Invalid);
+      }
+      promise.set_error(std::move(error));
+    }
+
+    promise.set_value(result.ok() ? CheckDialogUsernameResult::Ok : CheckDialogUsernameResult::Occupied);
+  });
+
+  switch (dialog_id.get_type()) {
+    case DialogType::User:
+      return td_->create_handler<CheckUsernameQuery>(std::move(request_promise))->send(username);
+    case DialogType::Channel:
+      return td_->create_handler<CheckChannelUsernameQuery>(std::move(request_promise))
+          ->send(dialog_id.get_channel_id(), username);
+    case DialogType::None:
+      return td_->create_handler<CheckChannelUsernameQuery>(std::move(request_promise))->send(ChannelId(), username);
+    case DialogType::Chat:
+    case DialogType::SecretChat:
+    default:
+      UNREACHABLE();
+  }
+}
+
+td_api::object_ptr<td_api::CheckChatUsernameResult> ContactsManager::get_check_chat_username_result_object(
+    CheckDialogUsernameResult result) {
+  switch (result) {
+    case CheckDialogUsernameResult::Ok:
+      return td_api::make_object<td_api::checkChatUsernameResultOk>();
+    case CheckDialogUsernameResult::Invalid:
+      return td_api::make_object<td_api::checkChatUsernameResultUsernameInvalid>();
+    case CheckDialogUsernameResult::Occupied:
+      return td_api::make_object<td_api::checkChatUsernameResultUsernameOccupied>();
+    case CheckDialogUsernameResult::PublicDialogsTooMuch:
+      return td_api::make_object<td_api::checkChatUsernameResultPublicChatsTooMuch>();
+    case CheckDialogUsernameResult::PublicGroupsUnavailable:
+      return td_api::make_object<td_api::checkChatUsernameResultPublicGroupsUnavailable>();
+    default:
+      UNREACHABLE();
+      return nullptr;
+  }
+}
+
 void ContactsManager::set_account_ttl(int32 account_ttl, Promise<Unit> &&promise) const {
   td_->create_handler<SetAccountTtlQuery>(std::move(promise))->send(account_ttl);
 }

td/telegram/ContactsManager.h

@@ -53,6 +53,8 @@ struct BotData {
 
 enum class ChannelType { Broadcast, Megagroup, Unknown };
 
+enum class CheckDialogUsernameResult { Ok, Invalid, Occupied, PublicDialogsTooMuch, PublicGroupsUnavailable };
+
 class ContactsManager : public Actor {
  public:
   ContactsManager(Td *td, ActorShared<> parent);
@@ -212,6 +214,11 @@ class ContactsManager : public Actor {
 
   void on_channel_unban_timeout(ChannelId channel_id);
 
+  void check_dialog_username(DialogId dialog_id, const string &username, Promise<CheckDialogUsernameResult> &&promise);
+
+  static td_api::object_ptr<td_api::CheckChatUsernameResult> get_check_chat_username_result_object(
+      CheckDialogUsernameResult result);
+
   void set_account_ttl(int32 account_ttl, Promise<Unit> &&promise) const;
   void get_account_ttl(Promise<int32> &&promise) const;
 

td/telegram/Td.cpp

@@ -1001,6 +1001,35 @@ class GetGroupsInCommonRequest : public RequestActor<> {
   }
 };
 
+class CheckChatUsernameRequest : public RequestActor<CheckDialogUsernameResult> {
+  DialogId dialog_id_;
+  string username_;
+
+  CheckDialogUsernameResult result_ = CheckDialogUsernameResult::Ok;
+
+  void do_run(Promise<CheckDialogUsernameResult> &&promise) override {
+    if (get_tries() < 2) {
+      promise.set_value(std::move(result_));
+      return;
+    }
+
+    td->contacts_manager_->check_dialog_username(dialog_id_, username_, std::move(promise));
+  }
+
+  void do_set_result(CheckDialogUsernameResult &&result) override {
+    result_ = std::move(result);
+  }
+
+  void do_send_result() override {
+    send_result(ContactsManager::get_check_chat_username_result_object(result_));
+  }
+
+ public:
+  CheckChatUsernameRequest(ActorShared<Td> td, uint64 request_id, int64 dialog_id, string username)
+      : RequestActor(std::move(td), request_id), dialog_id_(dialog_id), username_(std::move(username)) {
+  }
+};
+
 class GetCreatedPublicChatsRequest : public RequestActor<> {
   vector<DialogId> dialog_ids_;
 
@@ -5252,6 +5281,13 @@ void Td::on_request(uint64 id, const td_api::getGroupsInCommon &request) {
   CREATE_REQUEST(GetGroupsInCommonRequest, request.user_id_, request.offset_chat_id_, request.limit_);
 }
 
+void Td::on_request(uint64 id, td_api::checkChatUsername &request) {
+  CHECK_AUTH();
+  CHECK_IS_USER();
+  CLEAN_INPUT_STRING(request.username_);
+  CREATE_REQUEST(CheckChatUsernameRequest, request.chat_id_, std::move(request.username_));
+}
+
 void Td::on_request(uint64 id, const td_api::getCreatedPublicChats &request) {
   CHECK_AUTH();
   CHECK_IS_USER();

td/telegram/Td.h

@@ -429,6 +429,8 @@ class Td final : public NetQueryCallback {
 
   void on_request(uint64 id, const td_api::getGroupsInCommon &request);
 
+  void on_request(uint64 id, td_api::checkChatUsername &request);
+
   void on_request(uint64 id, const td_api::getCreatedPublicChats &request);
 
   void on_request(uint64 id, const td_api::openChat &request);

td/telegram/cli.cpp

@@ -2623,7 +2623,13 @@ class CliClient final : public Actor {
       std::tie(group_id, everyone_is_administrator) = split(args);
       send_request(make_tl_object<td_api::toggleBasicGroupAdministrators>(to_integer<int32>(group_id),
                                                                           as_bool(everyone_is_administrator)));
-    } else if (op == "csgun" || op == "cchun") {
+    } else if (op == "ccun") {
+      string chat_id;
+      string username;
+
+      std::tie(chat_id, username) = split(args);
+      send_request(make_tl_object<td_api::checkChatUsername>(as_chat_id(chat_id), username));
+    } else if (op == "ssgun" || op == "schun") {
       string supergroup_id;
       string username;