53 lines
1.7 KiB
Rust
53 lines
1.7 KiB
Rust
//! Implementation of IRC codec for Tokio.
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use bytes::BytesMut;
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use tokio_util::codec::{Decoder, Encoder};
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use crate::error;
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use crate::line::LineCodec;
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use crate::message::Message;
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/// An IRC codec built around an inner codec.
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pub struct IrcCodec {
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inner: LineCodec,
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}
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impl IrcCodec {
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/// Creates a new instance of IrcCodec wrapping a LineCodec with the specific encoding.
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pub fn new(label: &str) -> error::Result<IrcCodec> {
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LineCodec::new(label).map(|codec| IrcCodec { inner: codec })
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}
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/// Sanitizes the input string by cutting up to (and including) the first occurence of a line
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/// terminiating phrase (`\r\n`, `\r`, or `\n`). This is used in sending messages through the
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/// codec to prevent the injection of additional commands.
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pub fn sanitize(mut data: String) -> String {
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// n.b. ordering matters here to prefer "\r\n" over "\r"
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if let Some((pos, len)) = ["\r\n", "\r", "\n"]
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.iter()
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.flat_map(|needle| data.find(needle).map(|pos| (pos, needle.len())))
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.min_by_key(|&(pos, _)| pos)
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{
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data.truncate(pos + len);
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}
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data
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}
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}
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impl Decoder for IrcCodec {
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type Item = Message;
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type Error = error::ProtocolError;
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fn decode(&mut self, src: &mut BytesMut) -> error::Result<Option<Message>> {
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self.inner
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.decode(src)
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.and_then(|res| res.map_or(Ok(None), |msg| msg.parse::<Message>().map(Some)))
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}
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}
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impl Encoder<Message> for IrcCodec {
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type Error = error::ProtocolError;
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fn encode(&mut self, msg: Message, dst: &mut BytesMut) -> error::Result<()> {
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self.inner.encode(IrcCodec::sanitize(msg.to_string()), dst)
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}
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}
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