feat: Add admin commands for managing users' email addresses

src/service/mailer/messages.rs

@@ -8,8 +8,8 @@ pub trait MessageTemplate: Template {
 #[derive(Template)]
 #[template(path = "mail/change_email.txt.j2")]
 pub struct ChangeEmail<'a> {
-	user_id: &'a UserId,
-	verification_link: &'a str,
+	pub user_id: &'a UserId,
+	pub verification_link: String,
 }
 
 impl MessageTemplate for ChangeEmail<'_> {
@@ -19,8 +19,8 @@ impl MessageTemplate for ChangeEmail<'_> {
 #[derive(Template)]
 #[template(path = "mail/new_account.txt.j2")]
 pub struct NewAccount<'a> {
-	server_name: &'a str,
-	verification_link: &'a str,
+	pub server_name: &'a str,
+	pub verification_link: String,
 }
 
 impl MessageTemplate for NewAccount<'_> {
@@ -30,9 +30,9 @@ impl MessageTemplate for NewAccount<'_> {
 #[derive(Template)]
 #[template(path = "mail/password_reset.txt.j2")]
 pub struct PasswordReset<'a> {
-	display_name: &'a str,
-	user_id: &'a UserId,
-	verification_link: &'a str,
+	pub display_name: Option<&'a str>,
+	pub user_id: &'a UserId,
+	pub verification_link: String,
 }
 
 impl MessageTemplate for PasswordReset<'_> {

src/service/mailer/mod.rs

@@ -3,7 +3,7 @@ use std::sync::Arc;
 use conduwuit::{Err, Result, err, info};
 use lettre::{
 	AsyncSmtpTransport, AsyncTransport, Tokio1Executor,
-	message::{Mailbox, MessageBuilder},
+	message::{Mailbox, MessageBuilder, header::ContentType},
 };
 
 use crate::{Args, mailer::messages::MessageTemplate};
@@ -65,6 +65,11 @@ impl Service {
 			.as_ref()
 			.map(|(sender, transport)| Mailer { sender, transport })
 	}
+
+	pub fn expect_mailer(&self) -> Result<Mailer<'_>> {
+		self.mailer()
+			.ok_or_else(|| err!("SMTP is not configured on this server"))
+	}
 }
 
 pub struct Mailer<'a> {
@@ -89,6 +94,7 @@ impl Mailer<'_> {
 			.to(recipient)
 			.subject(subject)
 			.date_now()
+			.header(ContentType::TEXT_PLAIN)
 			.body(body)
 			.expect("should have been able to construct message");