lemmy/crates/utils/src/email.rs

104 lines
2.9 KiB
Rust
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use crate::{settings::structs::Settings, LemmyError};
use html2text;
use lettre::{
message::{header, Mailbox, MultiPart, SinglePart},
transport::smtp::{authentication::Credentials, extension::ClientId},
Address,
Message,
SmtpTransport,
Transport,
};
use std::str::FromStr;
use uuid::Uuid;
pub fn send_email(
subject: &str,
to_email: &str,
to_username: &str,
html: &str,
settings: &Settings,
) -> Result<(), LemmyError> {
let email_config = settings
.email
.to_owned()
.ok_or_else(|| LemmyError::from_message("no_email_setup"))?;
let domain = settings.hostname.to_owned();
let (smtp_server, smtp_port) = {
let email_and_port = email_config.smtp_server.split(':').collect::<Vec<&str>>();
if email_and_port.len() == 1 {
return Err(LemmyError::from_message(
"email.smtp_server needs a port, IE smtp.xxx.com:465",
));
}
(
email_and_port[0],
email_and_port[1]
.parse::<u16>()
.expect("email needs a port"),
)
};
// the message length before wrap, 78, is somewhat arbritary but looks good to me
let plain_text = html2text::from_read(html.as_bytes(), 78);
let email = Message::builder()
.from(
email_config
.smtp_from_address
.parse()
.expect("email from address isn't valid"),
)
.to(Mailbox::new(
Some(to_username.to_string()),
Address::from_str(to_email).expect("email to address isn't valid"),
))
.message_id(Some(format!("{}@{}", Uuid::new_v4(), settings.hostname)))
.subject(subject)
.multipart(
MultiPart::mixed().multipart(
MultiPart::alternative()
.singlepart(
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SinglePart::builder()
.header(header::ContentType::TEXT_PLAIN)
.body(plain_text),
)
.multipart(
MultiPart::related().singlepart(
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SinglePart::builder()
.header(header::ContentType::TEXT_HTML)
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.body(html.to_string()),
),
),
),
)
.expect("email built incorrectly");
// don't worry about 'dangeous'. it's just that leaving it at the default configuration
// is bad.
// Set the TLS
let builder_dangerous = SmtpTransport::builder_dangerous(smtp_server).port(smtp_port);
let mut builder = match email_config.tls_type.as_str() {
"starttls" => SmtpTransport::starttls_relay(smtp_server)?,
"tls" => SmtpTransport::relay(smtp_server)?,
_ => builder_dangerous,
};
// Set the creds if they exist
if let (Some(username), Some(password)) = (email_config.smtp_login, email_config.smtp_password) {
builder = builder.credentials(Credentials::new(username, password));
}
let mailer = builder.hello_name(ClientId::Domain(domain)).build();
let result = mailer.send(&email);
match result {
Ok(_) => Ok(()),
Err(e) => Err(LemmyError::from(e).with_message("email_send_failed")),
}
}