From a302df61d49f27875f50c22b1d62eeb8992519cd Mon Sep 17 00:00:00 2001
From: Lars Reichardt <lreichardt@saltation.de>
Date: Fri, 14 Oct 2016 10:57:26 +0200
Subject: [PATCH 1/2] feat(transport): add sendmail transport

---
 src/transport/mod.rs            |  1 +
 src/transport/sendmail/error.rs | 54 +++++++++++++++++++++++++++++++++
 src/transport/sendmail/mod.rs   | 44 +++++++++++++++++++++++++++
 3 files changed, 99 insertions(+)
 create mode 100644 src/transport/sendmail/error.rs
 create mode 100644 src/transport/sendmail/mod.rs

diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index e884bb8..bd575d2 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -1,5 +1,6 @@
 //! Represents an Email transport
 pub mod smtp;
+pub mod sendmail;
 pub mod stub;
 pub mod file;
 
diff --git a/src/transport/sendmail/error.rs b/src/transport/sendmail/error.rs
new file mode 100644
index 0000000..5db1cf7
--- /dev/null
+++ b/src/transport/sendmail/error.rs
@@ -0,0 +1,54 @@
+//! Error and result type for sendmail transport
+
+
+use self::Error::*;
+use std::error::Error as StdError;
+use std::fmt;
+use std::fmt::{Display, Formatter};
+use std::io;
+
+/// An enum of all error kinds.
+#[derive(Debug)]
+pub enum Error {
+    /// Internal client error
+    Client(&'static str),
+    /// IO error
+    Io(io::Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, fmt: &mut Formatter) -> Result<(), fmt::Error> {
+        fmt.write_str(self.description())
+    }
+}
+
+impl StdError for Error {
+    fn description(&self) -> &str {
+        match *self {
+            Client(_) => "an unknown error occured",
+            Io(_) => "an I/O error occured",
+        }
+    }
+
+    fn cause(&self) -> Option<&StdError> {
+        match *self {
+            Io(ref err) => Some(&*err as &StdError),
+            _ => None,
+        }
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(err: io::Error) -> Error {
+        Io(err)
+    }
+}
+
+impl From<&'static str> for Error {
+    fn from(string: &'static str) -> Error {
+        Client(string)
+    }
+}
+
+/// SendMail result type
+pub type SendmailResult = Result<(), Error>;
diff --git a/src/transport/sendmail/mod.rs b/src/transport/sendmail/mod.rs
new file mode 100644
index 0000000..6d226d7
--- /dev/null
+++ b/src/transport/sendmail/mod.rs
@@ -0,0 +1,44 @@
+//! This transport uilizes the sendmail executable for each email.
+
+use email::SendableEmail;
+use std::error::Error;
+use std::io::prelude::*;
+use std::process::{Command, Stdio};
+
+use transport::EmailTransport;
+use transport::sendmail::error::SendmailResult;
+
+pub mod error;
+
+/// Writes the content and the envelope information to a file
+pub struct SendmailTransport;
+
+impl EmailTransport<SendmailResult> for SendmailTransport {
+    fn send<T: SendableEmail>(&mut self, email: T) -> SendmailResult {
+        // Spawn the `wc` command
+        let process = try!(Command::new("/usr/bin/sendmail")
+            .args(&email.to_addresses())
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .spawn());
+
+        match process.stdin.unwrap().write_all(email.message().clone().as_bytes()) {
+            Err(why) => error!("couldn't write to sendmail stdin: {}",
+                               why.description()),
+            Ok(_) => info!("sent pangram to sendmail"),
+        }
+
+        let mut s = String::new();
+        match process.stdout.unwrap().read_to_string(&mut s) {
+            Err(why) => error!("couldn't read sendmail stdout: {}",
+                               why.description()),
+            Ok(_) => info!("sendmail responded with:\n{}", s),
+        }
+        
+        Ok(())
+    }
+
+    fn close(&mut self) {
+        ()
+    }
+}

From 13ee61d5cf5506826f88d202b57ae4f59f690f6d Mon Sep 17 00:00:00 2001
From: Lars Reichardt <lreichardt@saltation.de>
Date: Fri, 21 Oct 2016 14:32:28 +0200
Subject: [PATCH 2/2] test(transport): add sendmail transport test

---
 src/transport/sendmail/mod.rs |  2 +-
 tests/lib.rs                  |  1 +
 tests/transport_sendmail.rs   | 19 +++++++++++++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 tests/transport_sendmail.rs

diff --git a/src/transport/sendmail/mod.rs b/src/transport/sendmail/mod.rs
index 6d226d7..da8ed7c 100644
--- a/src/transport/sendmail/mod.rs
+++ b/src/transport/sendmail/mod.rs
@@ -16,7 +16,7 @@ pub struct SendmailTransport;
 impl EmailTransport<SendmailResult> for SendmailTransport {
     fn send<T: SendableEmail>(&mut self, email: T) -> SendmailResult {
         // Spawn the `wc` command
-        let process = try!(Command::new("/usr/bin/sendmail")
+        let process = try!(Command::new("/usr/sbin/sendmail")
             .args(&email.to_addresses())
             .stdin(Stdio::piped())
             .stdout(Stdio::piped())
diff --git a/tests/lib.rs b/tests/lib.rs
index 45a6ab9..1e446d5 100644
--- a/tests/lib.rs
+++ b/tests/lib.rs
@@ -1,5 +1,6 @@
 extern crate lettre;
 
 mod transport_smtp;
+mod transport_sendmail;
 mod transport_stub;
 mod transport_file;
diff --git a/tests/transport_sendmail.rs b/tests/transport_sendmail.rs
new file mode 100644
index 0000000..39f7dbb
--- /dev/null
+++ b/tests/transport_sendmail.rs
@@ -0,0 +1,19 @@
+extern crate lettre;
+
+use lettre::transport::sendmail::SendmailTransport;
+use lettre::transport::EmailTransport;
+use lettre::email::EmailBuilder;
+
+#[test]
+fn sendmail_transport_simple() {
+    let mut sender = SendmailTransport;
+    let email = EmailBuilder::new()
+                    .to("root@localhost")
+                    .from("user@localhost")
+                    .body("Hello World!")
+                    .subject("Hello")
+                    .build()
+                    .unwrap();
+    let result = sender.send(email);
+    assert!(result.is_ok());
+}