Add addApplicationChangelog.

td/generate/scheme/td_api.tl

@@ -8111,8 +8111,6 @@ getPhoneNumberInfo phone_number_prefix:string = PhoneNumberInfo;
 //@phone_number_prefix The phone number prefix
 getPhoneNumberInfoSync language_code:string phone_number_prefix:string = PhoneNumberInfo;
 
-//@description Returns the link for downloading official Telegram application to be used when the current user invites friends to Telegram
-getApplicationDownloadLink = HttpUrl;
 
 //@description Returns information about a tg:// deep link. Use "tg://need_update_for_some_feature" or "tg:some_unsupported_feature" for testing. Returns a 404 error for unknown links. Can be called before authorization @link The link
 getDeepLinkInfo link:string = DeepLinkInfo;
@@ -8121,9 +8119,15 @@ getDeepLinkInfo link:string = DeepLinkInfo;
 //@description Returns application config, provided by the server. Can be called before authorization
 getApplicationConfig = JsonValue;
 
+//@description Adds server-provided application changelog as messages to the chat 777000 (Telegram); for official applications only @previous_application_version The previous application version
+addApplicationChangelog previous_application_version:string = Ok;
+
 //@description Saves application log event on the server. Can be called before authorization @type Event type @chat_id Optional chat identifier, associated with the event @data The log event data
 saveApplicationLogEvent type:string chat_id:int53 data:JsonValue = Ok;
 
+//@description Returns the link for downloading official Telegram application to be used when the current user invites friends to Telegram
+getApplicationDownloadLink = HttpUrl;
+
 
 //@description Adds a proxy server for network requests. Can be called before authorization
 //@server Proxy server IP address

td/telegram/Application.cpp

@@ -11,6 +11,7 @@
 #include "td/telegram/logevent/LogEventHelper.h"
 #include "td/telegram/Td.h"
 #include "td/telegram/TdDb.h"
+#include "td/telegram/UpdatesManager.h"
 
 #include "td/db/binlog/BinlogEvent.h"
 #include "td/db/binlog/BinlogHelper.h"
@@ -77,6 +78,31 @@ class SaveAppLogQuery final : public Td::ResultHandler {
   }
 };
 
+class GetAppChangelogQuery final : public Td::ResultHandler {
+  Promise<Unit> promise_;
+
+ public:
+  explicit GetAppChangelogQuery(Promise<Unit> &&promise) : promise_(std::move(promise)) {
+  }
+
+  void send(const string &prev_app_version) {
+    send_query(G()->net_query_creator().create(telegram_api::help_getAppChangelog(prev_app_version)));
+  }
+
+  void on_result(BufferSlice packet) final {
+    auto result_ptr = fetch_result<telegram_api::help_getAppChangelog>(packet);
+    if (result_ptr.is_error()) {
+      return on_error(result_ptr.move_as_error());
+    }
+
+    td_->updates_manager_->on_get_updates(result_ptr.move_as_ok(), std::move(promise_));
+  }
+
+  void on_error(Status status) final {
+    promise_.set_error(std::move(status));
+  }
+};
+
 void get_invite_text(Td *td, Promise<string> &&promise) {
   td->create_handler<GetInviteTextQuery>(std::move(promise))->send();
 }
@@ -132,4 +158,8 @@ void on_save_app_log_binlog_event(Td *td, BinlogEvent &&event) {
   save_app_log_impl(td, std::move(log_event.input_app_event_out_), event.id_, Promise<Unit>());
 }
 
+void add_app_changelog(Td *td, const string &previous_application_version, Promise<Unit> &&promise) {
+  td->create_handler<GetAppChangelogQuery>(std::move(promise))->send(previous_application_version);
+}
+
 }  // namespace td

td/telegram/Application.h

@@ -25,4 +25,6 @@ void save_app_log(Td *td, const string &type, DialogId dialog_id, tl_object_ptr<
 
 void on_save_app_log_binlog_event(Td *td, BinlogEvent &&event);
 
+void add_app_changelog(Td *td, const string &previous_application_version, Promise<Unit> &&promise);
+
 }  // namespace td

td/telegram/Td.cpp

@@ -8320,6 +8320,13 @@ void Td::on_request(uint64 id, const td_api::getApplicationConfig &request) {
   send_closure(G()->config_manager(), &ConfigManager::get_app_config, std::move(promise));
 }
 
+void Td::on_request(uint64 id, td_api::addApplicationChangelog &request) {
+  CHECK_IS_USER();
+  CLEAN_INPUT_STRING(request.previous_application_version_);
+  CREATE_OK_REQUEST_PROMISE();
+  add_app_changelog(this, request.previous_application_version_, std::move(promise));
+}
+
 void Td::on_request(uint64 id, td_api::saveApplicationLogEvent &request) {
   CHECK_IS_USER();
   CLEAN_INPUT_STRING(request.type_);

td/telegram/Td.h

@@ -1462,6 +1462,8 @@ class Td final : public Actor {
 
   void on_request(uint64 id, const td_api::getApplicationConfig &request);
 
+  void on_request(uint64 id, td_api::addApplicationChangelog &request);
+
   void on_request(uint64 id, td_api::saveApplicationLogEvent &request);
 
   void on_request(uint64 id, td_api::addProxy &request);

td/telegram/cli.cpp

@@ -3647,6 +3647,8 @@ class CliClient final : public Actor {
       execute(td_api::make_object<td_api::getThemeParametersJsonString>(as_theme_parameters()));
     } else if (op == "gac") {
       send_request(td_api::make_object<td_api::getApplicationConfig>());
+    } else if (op == "aac") {
+      send_request(td_api::make_object<td_api::addApplicationChangelog>(args));
     } else if (op == "sale") {
       string type;
       ChatId chat_id;