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//! The RFC 959 File Structure (`STRU`) command
//
// The argument is a single Telnet character code specifying
// file structure described in the Section on Data
// Representation and Storage.
//
// The following codes are assigned for structure:
//
// F - File (no record structure)
// R - Record structure
// P - Page structure
//
// The default structure is File.
use crate::{
auth::UserDetail,
server::controlchan::{
Reply, ReplyCode,
error::ControlChanError,
handler::{CommandContext, CommandHandler},
},
storage::{Metadata, StorageBackend},
};
use async_trait::async_trait;
/// The parameter the can be given to the `STRU` command. It is used to set the file `STRU`cture to
/// the given structure. This stems from a time where it was common for some operating
/// systems to address i.e. particular records in files, but isn't used a lot these days. We
/// support the command itself for legacy reasons, but will only support the `File` structure.
// Unfortunately Rust doesn't support anonymous enums for now, so we'll have to do with explicit
// command parameter enums for the commands that take mutually exclusive parameters.
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum StruParam {
/// "Regular" file structure.
File,
/// Files are structured in "Records".
Record,
/// Files are structured in "Pages".
Page,
}
#[derive(Debug)]
pub struct Stru {
params: StruParam,
}
impl Stru {
pub fn new(params: StruParam) -> Self {
Stru { params }
}
}
#[async_trait]
impl<Storage, User> CommandHandler<Storage, User> for Stru
where
User: UserDetail + 'static,
Storage: StorageBackend<User> + 'static,
Storage::Metadata: Metadata,
{
#[tracing_attributes::instrument]
async fn handle(&self, _args: CommandContext<Storage, User>) -> Result<Reply, ControlChanError> {
match &self.params {
StruParam::File => Ok(Reply::new(ReplyCode::CommandOkay, "In File structure mode")),
_ => Ok(Reply::new(
ReplyCode::CommandNotImplementedForParameter,
"Only File structure mode is supported",
)),
}
}
}