Verify Email + Reset Password flows (#654)

* verifiers

* add missing emails

* fix gh perms

src/auth/email/mod.rs

@@ -0,0 +1,72 @@
+use lettre::message::header::ContentType;
+use lettre::message::Mailbox;
+use lettre::transport::smtp::authentication::Credentials;
+use lettre::{Address, Message, SmtpTransport, Transport};
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum MailError {
+    #[error("Environment Error")]
+    Env(#[from] dotenvy::Error),
+    #[error("Mail Error: {0}")]
+    Mail(#[from] lettre::error::Error),
+    #[error("Address Parse Error: {0}")]
+    Address(#[from] lettre::address::AddressError),
+    #[error("SMTP Error: {0}")]
+    Smtp(#[from] lettre::transport::smtp::Error),
+}
+
+pub fn send_email_raw(to: String, subject: String, body: String) -> Result<(), MailError> {
+    let email = Message::builder()
+        .from(Mailbox::new(
+            Some("Modrinth".to_string()),
+            Address::new("no-reply", "mail.modrinth.com")?,
+        ))
+        .to(to.parse().unwrap())
+        .subject(subject)
+        .header(ContentType::TEXT_HTML)
+        .body(body)
+        .unwrap();
+
+    let username = dotenvy::var("SMTP_USERNAME")?;
+    let password = dotenvy::var("SMTP_PASSWORD")?;
+    let host = dotenvy::var("SMTP_HOST")?;
+    let creds = Credentials::new(username, password);
+
+    let mailer = SmtpTransport::relay(&host)
+        .unwrap()
+        .credentials(creds)
+        .build();
+
+    mailer.send(&email)?;
+
+    Ok(())
+}
+
+pub fn send_email(
+    to: String,
+    email_title: &str,
+    email_description: &str,
+    line_two: &str,
+    button_info: Option<(&str, &str)>,
+) -> Result<(), MailError> {
+    let mut email = if button_info.is_some() {
+        include_str!("button_notif.html")
+    } else {
+        include_str!("auth_notif.html")
+    }
+    .replace("{{ email_title }}", email_title)
+    .replace("{{ email_description }}", email_description)
+    .replace("{{ line_one }}", email_description)
+    .replace("{{ line_two }}", line_two);
+
+    if let Some((button_title, button_link)) = button_info {
+        email = email
+            .replace("{{ button_title }}", button_title)
+            .replace("{{ button_link }}", button_link);
+    }
+
+    send_email_raw(to, email_title.to_string(), email)?;
+
+    Ok(())
+}