From e893869df974ebb7afcc318119840c53f8f377cb Mon Sep 17 00:00:00 2001
From: cel 🌸 <cel@blos.sm>
Date: Sat, 21 Oct 2023 01:28:54 +0100
Subject: implement connection

---
 src/connection.rs | 162 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 src/connection.rs

(limited to 'src/connection.rs')

diff --git a/src/connection.rs b/src/connection.rs
new file mode 100644
index 0000000..24f7745
--- /dev/null
+++ b/src/connection.rs
@@ -0,0 +1,162 @@
+use std::net::{IpAddr, SocketAddr};
+use std::str;
+use std::str::FromStr;
+
+use tokio::net::TcpStream;
+use tokio_native_tls::native_tls::TlsConnector;
+// TODO: use rustls
+use tokio_native_tls::TlsStream;
+
+use crate::Jabber;
+use crate::JabberError;
+use crate::Result;
+
+pub type Tls = TlsStream<TcpStream>;
+pub type Unencrypted = TcpStream;
+
+pub enum Connection {
+    Encrypted(Jabber<Tls>),
+    Unencrypted(Jabber<Unencrypted>),
+}
+
+impl Connection {
+    pub async fn ensure_tls(self) -> Result<Jabber<Tls>> {
+        match self {
+            Connection::Encrypted(j) => Ok(j),
+            Connection::Unencrypted(j) => Ok(j.starttls().await?),
+        }
+    }
+
+    // pub async fn connect_user<J: TryInto<JID>>(jid: J, password: String) -> Result<Self> {
+    //     let server = jid.domainpart.clone();
+    //     let auth = SASLConfig::with_credentials(None, jid.localpart.clone().unwrap(), password)?;
+    //     println!("auth: {:?}", auth);
+    //     Self::connect(&server, jid.try_into()?, Some(auth)).await
+    // }
+
+    async fn connect(server: &str) -> Result<Self> {
+        let sockets = Self::get_sockets(&server).await;
+        for (socket_addr, tls) in sockets {
+            match tls {
+                true => {
+                    if let Ok(connection) = Self::connect_tls(socket_addr, &server).await {
+                        let (readhalf, writehalf) = tokio::io::split(connection);
+                        return Ok(Self::Encrypted(Jabber::new(
+                            readhalf,
+                            writehalf,
+                            None,
+                            None,
+                            server.to_owned(),
+                        )));
+                    }
+                }
+                false => {
+                    if let Ok(connection) = Self::connect_unencrypted(socket_addr).await {
+                        let (readhalf, writehalf) = tokio::io::split(connection);
+                        return Ok(Self::Unencrypted(Jabber::new(
+                            readhalf,
+                            writehalf,
+                            None,
+                            None,
+                            server.to_owned(),
+                        )));
+                    }
+                }
+            }
+        }
+        Err(JabberError::Connection)
+    }
+
+    async fn get_sockets(domain: &str) -> Vec<(SocketAddr, bool)> {
+        let mut socket_addrs = Vec::new();
+
+        // if it's a socket/ip then just return that
+
+        // socket
+        if let Ok(socket_addr) = SocketAddr::from_str(domain) {
+            match socket_addr.port() {
+                5223 => socket_addrs.push((socket_addr, true)),
+                _ => socket_addrs.push((socket_addr, false)),
+            }
+
+            return socket_addrs;
+        }
+        // ip
+        if let Ok(ip) = IpAddr::from_str(domain) {
+            socket_addrs.push((SocketAddr::new(ip, 5222), false));
+            socket_addrs.push((SocketAddr::new(ip, 5223), true));
+            return socket_addrs;
+        }
+
+        // otherwise resolve
+        if let Ok(resolver) = trust_dns_resolver::AsyncResolver::tokio_from_system_conf() {
+            if let Ok(lookup) = resolver
+                .srv_lookup(format!("_xmpp-client._tcp.{}", domain))
+                .await
+            {
+                for srv in lookup {
+                    resolver
+                        .lookup_ip(srv.target().to_owned())
+                        .await
+                        .map(|ips| {
+                            for ip in ips {
+                                socket_addrs.push((SocketAddr::new(ip, srv.port()), false))
+                            }
+                        });
+                }
+            }
+            if let Ok(lookup) = resolver
+                .srv_lookup(format!("_xmpps-client._tcp.{}", domain))
+                .await
+            {
+                for srv in lookup {
+                    resolver
+                        .lookup_ip(srv.target().to_owned())
+                        .await
+                        .map(|ips| {
+                            for ip in ips {
+                                socket_addrs.push((SocketAddr::new(ip, srv.port()), true))
+                            }
+                        });
+                }
+            }
+
+            // in case cannot connect through SRV records
+            resolver.lookup_ip(domain).await.map(|ips| {
+                for ip in ips {
+                    socket_addrs.push((SocketAddr::new(ip, 5222), false));
+                    socket_addrs.push((SocketAddr::new(ip, 5223), true));
+                }
+            });
+        }
+        socket_addrs
+    }
+
+    /// establishes a connection to the server
+    pub async fn connect_tls(socket_addr: SocketAddr, domain_name: &str) -> Result<Tls> {
+        let socket = TcpStream::connect(socket_addr)
+            .await
+            .map_err(|_| JabberError::Connection)?;
+        let connector = TlsConnector::new().map_err(|_| JabberError::Connection)?;
+        tokio_native_tls::TlsConnector::from(connector)
+            .connect(domain_name, socket)
+            .await
+            .map_err(|_| JabberError::Connection)
+    }
+
+    pub async fn connect_unencrypted(socket_addr: SocketAddr) -> Result<Unencrypted> {
+        TcpStream::connect(socket_addr)
+            .await
+            .map_err(|_| JabberError::Connection)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn connect() {
+        Connection::connect("blos.sm").await.unwrap();
+    }
+}
-- 
cgit