Send client certs if they exist in ClientCertificateStore; Impl

TryFrom<Vec<u8>> for Response; Adjust error types to fit all new cases;

src/response/error.rs

@@ -1,6 +1,6 @@
 use {
     crate::prelude::ParseStatusError,
-    std::{fmt, num::ParseIntError},
+    std::{fmt, num::ParseIntError, string::FromUtf8Error},
 };
 
 #[derive(Debug, PartialEq)]
@@ -16,6 +16,8 @@ pub enum Error {
     StatusError,
     /// The response was malformed
     Malformed,
+    /// The response is not valid utf8
+    Utf8Error,
 }
 
 impl fmt::Display for Error {
@@ -25,6 +27,7 @@ impl fmt::Display for Error {
             Self::ParseInt(e) => write!(f, "ParseResponseError: {e}"),
             Self::StatusError => write!(f, "ParseResponseError: Invalid Status"),
             Self::Malformed => write!(f, "ParseResponseError: Malformed"),
+            Self::Utf8Error => write!(f, "ParseResponseError: Not Utf8"),
         }
     }
 }
@@ -49,3 +52,9 @@ impl From<ParseStatusError> for Error {
         Self::StatusError
     }
 }
+
+impl From<FromUtf8Error> for Error {
+    fn from(_value: FromUtf8Error) -> Self {
+        Self::Utf8Error
+    }
+}

src/response/mod.rs

@@ -43,6 +43,14 @@ impl FromStr for Response {
     }
 }
 
+impl TryFrom<Vec<u8>> for Response {
+    type Error = Error;
+
+    fn try_from(value: Vec<u8>) -> Result<Self, Self::Error> {
+        String::from_utf8(value)?.as_str().parse()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/sender/error.rs

@@ -1,11 +1,13 @@
 use {
     crate::prelude::{ParseRequestError, ParseResponseError},
+    rustls::InvalidMessage,
     std::{fmt, io},
 };
 
 #[derive(Debug)]
 /// Errors which might occur when sending a message
 pub enum Error {
+    CertificateError(InvalidMessage),
     DnsError,
     TlsError(rustls::Error),
     RequestError(ParseRequestError),
@@ -16,6 +18,7 @@ pub enum Error {
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
+            Self::CertificateError(e) => write!(f, "{e:?}"),
             Self::DnsError => write!(f, "Dns Error"),
             Self::TlsError(e) => write!(f, "{e}"),
             Self::RequestError(e) => write!(f, "{e}"),
@@ -28,15 +31,21 @@ impl fmt::Display for Error {
 impl std::error::Error for Error {
     fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
         match self {
-            Self::DnsError => None,
             Self::RequestError(e) => Some(e),
             Self::ResponseError(e) => Some(e),
             Self::TlsError(e) => Some(e),
             Self::IoError(e) => Some(e),
+            _ => None,
         }
     }
 }
 
+impl From<InvalidMessage> for Error {
+    fn from(value: InvalidMessage) -> Self {
+        Self::CertificateError(value)
+    }
+}
+
 impl From<rustls::Error> for Error {
     fn from(value: rustls::Error) -> Self {
         Self::TlsError(value)

src/sender/mod.rs

@@ -1,40 +1,40 @@
-use std::{
-    io,
+use {
+    crate::prelude::{CertificateStore, ClientCertificateStore, Request, Response},
+    rustls::{internal::msgs::codec::Codec, ClientConfig, ClientConnection, StreamOwned},
+    std::{
+        io::{self, Read, Write},
         net::{TcpStream, ToSocketAddrs},
         sync::Arc,
         time::Duration,
+    },
 };
 
-use rustls::{ClientConfig, ClientConnection, StreamOwned};
-
 pub use self::{error::Error, verifier::Verifier};
-use {
-    crate::prelude::{CertificateStore, Request},
-    std::io::{Read, Write},
-};
 
 mod error;
 mod verifier;
 
 #[derive(Debug)]
 /// Sends a piece of mail from the sending server to the receiving server
-pub struct Sender<S>
+pub struct Sender<S, C>
 where
     S: CertificateStore,
+    C: ClientCertificateStore,
 {
     /// The full message text to be sent
     pub request: Request,
     /// A [CertificateStore] for servers known to us
     pub store: S,
     /// A [CertificateStore] for mailboxes which exist on this system
-    pub client_store: S,
+    pub client_store: C,
 }
 
-impl<S> Sender<S>
+impl<S, C> Sender<S, C>
 where
     S: CertificateStore + 'static,
+    C: ClientCertificateStore,
 {
-    pub fn new(request_str: &str, store: S, client_store: S) -> Result<Self, Error> {
+    pub fn new(request_str: &str, store: S, client_store: C) -> Result<Self, Error> {
         let request: Request = request_str.parse()?;
         Ok(Self {
             request,
@@ -47,16 +47,14 @@ where
         self.request.sender.host.to_string()
     }
 
-    pub fn send(self) -> Result<Vec<u8>, Error> {
+    pub fn send(self) -> Result<Response, Error> {
         let dnsname = self
             .host_string()
             .as_str()
             .try_into()
             .map_err(|_| Error::DnsError)?;
         let mut it = self.request.sender.host.to_socket_addrs()?;
-        let client_cert = self
-            .client_store
-            .get_certificate(&self.request.sender.to_string());
+        let client_cert = self.client_store.get_certificate(&self.request.sender);
         let verifier = Arc::new(Verifier::new(self.store));
         let Some(socket_addrs) = it.next() else {
             return Err(io::Error::new(io::ErrorKind::Other, "no data retrieved").into());
@@ -67,7 +65,12 @@ where
             .with_custom_certificate_verifier(verifier);
         let cfg = match client_cert {
             None => cfg.with_no_client_auth(),
-            Some(_) => cfg.with_no_client_auth(), // todo: cfg.with_single_cert(cert_chain, key_der)
+            Some(c) => {
+                let rustls_cert = rustls::Certificate::read_bytes(&c.der)?;
+                let cert_chain = vec![rustls_cert];
+                let key_der = rustls::PrivateKey(c.key);
+                cfg.with_single_cert(cert_chain, key_der)?
+            }
         };
         let client = ClientConnection::new(Arc::new(cfg), dnsname)?;
         let mut stream = StreamOwned::new(client, tcp_stream);
@@ -76,6 +79,7 @@ where
         stream.read_to_end(&mut buf)?;
         stream.conn.send_close_notify();
         drop(stream);
-        Ok(buf)
+        let res = buf.try_into()?;
+        Ok(res)
     }
 }