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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use neqo_common::{Decoder, Encoder};
use super::hframe::HFrameType;
use crate::{frames::reader::FrameDecoder, Error, Res};
pub type WebTransportFrameType = u64;
const WT_FRAME_CLOSE_SESSION: WebTransportFrameType = 0x2843;
const WT_FRAME_CLOSE_MAX_MESSAGE_SIZE: u64 = 1024;
#[derive(PartialEq, Eq, Debug)]
pub enum WebTransportFrame {
CloseSession { error: u32, message: String },
}
impl WebTransportFrame {
pub fn encode(&self, enc: &mut Encoder) {
enc.encode_varint(WT_FRAME_CLOSE_SESSION);
let Self::CloseSession { error, message } = &self;
enc.encode_varint(4 + message.len() as u64);
enc.encode_uint(4, *error);
enc.encode(message.as_bytes());
}
}
impl FrameDecoder<Self> for WebTransportFrame {
fn decode(frame_type: HFrameType, frame_len: u64, data: Option<&[u8]>) -> Res<Option<Self>> {
if let Some(payload) = data {
let mut dec = Decoder::from(payload);
if frame_type == HFrameType(WT_FRAME_CLOSE_SESSION) {
if frame_len > WT_FRAME_CLOSE_MAX_MESSAGE_SIZE + 4 {
return Err(Error::HttpMessageError);
}
let error =
u32::try_from(dec.decode_uint(4).ok_or(Error::HttpMessageError)?).unwrap();
let Ok(message) = String::from_utf8(dec.decode_remainder().to_vec()) else {
return Err(Error::HttpMessageError);
};
Ok(Some(Self::CloseSession { error, message }))
} else {
Ok(None)
}
} else {
Ok(None)
}
}
fn is_known_type(frame_type: HFrameType) -> bool {
frame_type == HFrameType(WT_FRAME_CLOSE_SESSION)
}
}