Add knob to control the file expiration timeout.

This allows tweaking the value (from the default 1h timeout) so that
loaded servers do not run out of disk by setting it to a smaller value.

docker-entrypoint.sh

@@ -56,7 +56,10 @@ if [ -n "$TELEGRAM_RELATIVE" ]; then
   CUSTOM_ARGS="${CUSTOM_ARGS} --relative"
 fi
 if [ -n "$TELEGRAM_MAX_BATCH" ]; then
-  CUSTOM_ARGS="${CUSTOM_ARGS} ---max-batch-operations=$TELEGRAM_MAX_BATCH"
+  CUSTOM_ARGS="${CUSTOM_ARGS} --max-batch-operations=$TELEGRAM_MAX_BATCH"
+fi
+if [ -n "$TELEGRAM_FILE_EXPIRATION_TIME" ]; then
+  CUSTOM_ARGS="${CUSTOM_ARGS} --file-expiration-time=$TELEGRAM_FILE_EXPIRATION_TIME"
 fi
 if [ -n "$TELEGRAM_LOGS" ]; then
   CUSTOM_ARGS="$CUSTOM_ARGS --log=${TELEGRAM_LOGS}"

telegram-bot-api/Client.cpp

@@ -4581,7 +4581,8 @@ void Client::on_update_authorization_state() {
                                                   make_object<td_api::optionValueInteger>(3600)),
                    std::make_unique<TdOnOkCallback>());
       send_request(make_object<td_api::setOption>("delete_file_reference_after_seconds",
-                                                  make_object<td_api::optionValueInteger>(3600)),
+                                                  make_object<td_api::optionValueInteger>(
+                                                          parameters_->file_expiration_timeout_seconds_)),
                    std::make_unique<TdOnOkCallback>());
 
       auto parameters = make_object<td_api::tdlibParameters>();

telegram-bot-api/ClientParameters.h

@@ -76,6 +76,7 @@ struct ClientParameters {
 
   td::uint32 max_batch_operations = 10000;
   double start_time_ = 0;
+  td::int32 file_expiration_timeout_seconds_ = 3600;
 
   td::ActorId<td::GetHostByNameActor> get_host_by_name_actor_id_;
 

telegram-bot-api/telegram-bot-api.cpp

@@ -314,6 +314,9 @@ int main(int argc, char *argv[]) {
 
   options.add_checked_option('\0', "max-batch-operations", PSLICE() << "maximum number of batch operations (default: " << parameters->max_batch_operations << ")",
                              td::OptionParser::parse_integer(parameters->max_batch_operations));
+  options.add_checked_option('\0', "file-expiration-time",
+                             PSLICE() << "downloaded files expire after this amount of seconds of not being used (defaults to " << parameters->file_expiration_timeout_seconds_ << ")",
+                             td::OptionParser::parse_integer(parameters->file_expiration_timeout_seconds_));
 
   options.add_checked_option(
       '\0', "proxy", PSLICE() << "HTTP proxy server for outgoing webhook requests in the format http://host:port",