Re-write email backend, use SMTP directly.

src/util/email.rs

@@ -0,0 +1,96 @@
+use lettre::message::{header, MultiPart, SinglePart};
+use lettre::transport::smtp::authentication::Credentials;
+use lettre::{Message, SmtpTransport, Transport};
+
+use super::variables::{PUBLIC_URL, SMTP_FROM, SMTP_HOST, SMTP_PASSWORD, SMTP_USERNAME};
+
+lazy_static! {
+    static ref MAILER: lettre::transport::smtp::SmtpTransport =
+        SmtpTransport::relay(SMTP_HOST.as_ref())
+            .unwrap()
+            .credentials(Credentials::new(
+                SMTP_USERNAME.to_string(),
+                SMTP_PASSWORD.to_string()
+            ))
+            .build();
+}
+
+fn send(message: Message) -> Result<(), String> {
+    MAILER
+        .send(&message)
+        .map_err(|err| format!("Failed to send email! {}", err.to_string()))?;
+
+    Ok(())
+}
+
+fn generate_multipart(text: &str, html: &str) -> MultiPart {
+    MultiPart::mixed().multipart(
+        MultiPart::alternative()
+            .singlepart(
+                SinglePart::quoted_printable()
+                    .header(header::ContentType(
+                        "text/plain; charset=utf8".parse().unwrap(),
+                    ))
+                    .body(text),
+            )
+            .multipart(
+                MultiPart::related().singlepart(
+                    SinglePart::eight_bit()
+                        .header(header::ContentType(
+                            "text/html; charset=utf8".parse().unwrap(),
+                        ))
+                        .body(html),
+                ),
+            ),
+    )
+}
+
+pub fn send_verification_email(email: String, code: String) -> Result<(), String> {
+    let url = format!("{}/api/account/verify/{}", PUBLIC_URL.to_string(), code);
+    let email = Message::builder()
+        .from(SMTP_FROM.to_string().parse().unwrap())
+        .to(email.parse().unwrap())
+        .subject("Verify your email!")
+        .multipart(generate_multipart(
+            &format!("Verify your email here: {}", url),
+            &format!("<a href=\"{}\">Click to verify your email!</a>", url),
+        ))
+        .unwrap();
+
+    send(email)
+}
+
+pub fn send_password_reset(email: String, code: String) -> Result<(), String> {
+    let url = format!("{}/api/account/reset/{}", PUBLIC_URL.to_string(), code);
+    let email = Message::builder()
+        .from(SMTP_FROM.to_string().parse().unwrap())
+        .to(email.parse().unwrap())
+        .subject("Reset your password.")
+        .multipart(generate_multipart(
+            &format!("Reset your password here: {}", url),
+            &format!("<a href=\"{}\">Click to reset your password!</a>", url),
+        ))
+        .unwrap();
+
+    send(email)
+}
+
+pub fn send_welcome_email(email: String, username: String) -> Result<(), String> {
+    let email = Message::builder()
+        .from(SMTP_FROM.to_string().parse().unwrap())
+        .to(email.parse().unwrap())
+        .subject("Welcome to REVOLT!")
+        .multipart(
+        generate_multipart(
+            &format!("Welcome, {}! You can now use REVOLT.", username),
+            &format!(
+                    "<b>Welcome, {}!</b><br/>You can now use REVOLT.<br/><a href=\"{}\">Go to REVOLT</a>",
+                    username,
+                    PUBLIC_URL.to_string()
+                )
+            )
+        )
+        .unwrap();
+
+    send(email)
+}