use std::str;
use quick_xml::{
de::Deserializer,
events::{BytesDecl, BytesStart, Event},
name::QName,
se::Serializer,
Reader, Writer,
};
use rsasl::prelude::{Mechname, SASLClient};
use serde::{Deserialize, Serialize};
use tokio::io::{AsyncWriteExt, BufReader, ReadHalf, WriteHalf};
use tokio::net::TcpStream;
use tokio_native_tls::TlsStream;
use crate::stanza::{
sasl::{Auth, Challenge, Mechanisms},
stream::{StreamFeature, StreamFeatures},
};
use crate::Jabber;
use crate::Result;
pub struct JabberClient<'j> {
reader: Reader<BufReader<ReadHalf<TlsStream<TcpStream>>>>,
writer: WriteHalf<TlsStream<TcpStream>>,
jabber: &'j mut Jabber<'j>,
}
impl<'j> JabberClient<'j> {
pub fn new(
reader: Reader<BufReader<ReadHalf<TlsStream<TcpStream>>>>,
writer: WriteHalf<TlsStream<TcpStream>>,
jabber: &'j mut Jabber<'j>,
) -> Self {
Self {
reader,
writer,
jabber,
}
}
pub async fn start_stream(&mut self) -> Result<()> {
let declaration = BytesDecl::new("1.0", None, None);
let mut stream_element = BytesStart::new("stream:stream");
stream_element.push_attribute(("from".as_bytes(), self.jabber.jid.to_string().as_bytes()));
stream_element.push_attribute(("to".as_bytes(), self.jabber.server.as_bytes()));
stream_element.push_attribute(("version", "1.0"));
stream_element.push_attribute(("xml:lang", "en"));
stream_element.push_attribute(("xmlns", "jabber:client"));
stream_element.push_attribute(("xmlns:stream", "http://etherx.jabber.org/streams"));
let mut writer = Writer::new(&mut self.writer);
writer.write_event_async(Event::Decl(declaration)).await;
writer.write_event_async(Event::Start(stream_element)).await;
let mut buf = Vec::new();
loop {
match self.reader.read_event_into_async(&mut buf).await.unwrap() {
Event::Start(e) => {
println!("{:?}", e);
break;
}
e => println!("decl: {:?}", e),
};
}
Ok(())
}
pub async fn get_node<'a>(&mut self) -> Result<String> {
let mut buf = Vec::new();
let mut txt = Vec::new();
let mut qname_set = false;
let mut qname: Option<Vec<u8>> = None;
loop {
match self.reader.read_event_into_async(&mut buf).await? {
Event::Start(e) => {
if !qname_set {
qname = Some(e.name().into_inner().to_owned());
qname_set = true;
}
txt.push(b'<');
txt = txt
.into_iter()
.chain(buf.to_owned())
.chain(vec![b'>'])
.collect();
}
Event::End(e) => {
let mut end = false;
if e.name() == QName(qname.as_deref().unwrap()) {
end = true;
}
txt.push(b'<');
txt = txt
.into_iter()
.chain(buf.to_owned())
.chain(vec![b'>'])
.collect();
if end {
break;
}
}
Event::Text(_e) => {
txt = txt.into_iter().chain(buf.to_owned()).collect();
}
_ => {
txt.push(b'<');
txt = txt
.into_iter()
.chain(buf.to_owned())
.chain(vec![b'>'])
.collect();
}
}
buf.clear();
}
println!("{:?}", txt);
let decoded = str::from_utf8(&txt)?.to_owned();
println!("{:?}", decoded);
Ok(decoded)
}
pub async fn get_features(&mut self) -> Result<Vec<StreamFeature>> {
let node = self.get_node().await?;
let mut deserializer = Deserializer::from_str(&node);
let features = StreamFeatures::deserialize(&mut deserializer).unwrap();
println!("{:?}", features);
Ok(features.features)
}
pub async fn negotiate(&mut self) -> Result<()> {
loop {
println!("loop");
let features = &self.get_features().await?;
println!("{:?}", features);
match &features[0] {
StreamFeature::Sasl(sasl) => {
println!("{:?}", sasl);
self.sasl(&sasl).await?;
}
StreamFeature::Bind => todo!(),
x => println!("{:?}", x),
}
}
}
pub async fn sasl(&mut self, mechanisms: &Mechanisms) -> Result<()> {
println!("{:?}", mechanisms);
let sasl = SASLClient::new(self.jabber.auth.clone());
let mut offered_mechs: Vec<&Mechname> = Vec::new();
for mechanism in &mechanisms.mechanisms {
offered_mechs.push(Mechname::parse(&mechanism.mechanism.as_bytes())?)
}
println!("{:?}", offered_mechs);
let mut session = sasl.start_suggested(&offered_mechs)?;
let selected_mechanism = session.get_mechname().as_str().to_owned();
println!("selected mech: {:?}", selected_mechanism);
let mut data: Option<Vec<u8>> = None;
if !session.are_we_first() {
// if not first mention the mechanism then get challenge data
// mention mechanism
let auth = Auth {
ns: "urn:ietf:params:xml:ns:xmpp-sasl".to_owned(),
mechanism: selected_mechanism.clone(),
sasl_data: Some("=".to_owned()),
};
let mut buffer = String::new();
let ser = Serializer::new(&mut buffer);
auth.serialize(ser).unwrap();
self.writer.write_all(buffer.as_bytes());
// get challenge data
let node = self.get_node().await?;
let mut deserializer = Deserializer::from_str(&node);
let challenge = Challenge::deserialize(&mut deserializer).unwrap();
println!("challenge: {:?}", challenge);
data = Some(challenge.sasl_data.as_bytes().to_owned());
println!("we didn't go first");
} else {
// if first, mention mechanism and send data
let mut sasl_data = Vec::new();
session.step64(None, &mut sasl_data).unwrap();
let auth = Auth {
ns: "urn:ietf:params:xml:ns:xmpp-sasl".to_owned(),
mechanism: selected_mechanism.clone(),
sasl_data: Some(str::from_utf8(&sasl_data).unwrap().to_owned()),
};
let mut buffer = String::new();
let ser = Serializer::new(&mut buffer);
auth.serialize(ser).unwrap();
println!("node: {:?}", buffer);
self.writer.write_all(buffer.as_bytes()).await;
println!("we went first");
// get challenge data
// TODO: check if needed
// let node = self.get_node().await?;
// println!("node: {:?}", node);
// let mut deserializer = Deserializer::from_str(&node);
// let challenge = Challenge::deserialize(&mut deserializer).unwrap();
// println!("challenge: {:?}", challenge);
// data = Some(challenge.sasl_data.as_bytes().to_owned());
}
// stepping the authentication exchange to completion
let mut sasl_data = Vec::new();
while {
// decide if need to send more data over
let state = session
.step64(data.as_deref(), &mut sasl_data)
.expect("step errored!");
state.is_running()
} {
// While we aren't finished, receive more data from the other party
let auth = Auth {
ns: "urn:ietf:params:xml:ns:xmpp-sasl".to_owned(),
mechanism: selected_mechanism.clone(),
sasl_data: Some(str::from_utf8(&sasl_data).unwrap().to_owned()),
};
let mut buffer = String::new();
let ser = Serializer::new(&mut buffer);
auth.serialize(ser).unwrap();
self.writer.write_all(buffer.as_bytes());
let node = self.get_node().await?;
let mut deserializer = Deserializer::from_str(&node);
let challenge = Challenge::deserialize(&mut deserializer).unwrap();
data = Some(challenge.sasl_data.as_bytes().to_owned());
}
self.start_stream().await?;
Ok(())
}
}
