[DO NOT MERGE] Email notification system (#4338)

* Migration

* Fixup db models

* Redis

* Stuff

* Switch PKs to BIGSERIALs, insert to notifications_deliveries when inserting notifications

* Queue, templates

* Query cache

* Fixes, fixtures

* Perf, cache template data & HTML bodies

* Notification type configuration, ResetPassword notification type

* Reset password

* Query cache

* Clippy + fmt

* Traces, fix typo, fix user email in ResetPassword

* send_email

* Models, db

* Remove dead code, adjust notification settings in migration

* Clippy fmt

* Delete dead code, fixes

* Fmt

* Update apps/labrinth/src/queue/email.rs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>

* Remove old fixtures

* Unify email retry delay

* Fix type

* External notifications

* Remove `notifications_types_preference_restrictions`, as user notification preferences is out of scope for this PR

* Query cache, fmt, clippy

* Fix join in get_many_user_exposed_on_site

* Remove migration comment

* Query cache

* Update html body urls

* Remove comment

* Add paymentfailed.service variable to PaymentFailed notification variant

* Fix compile error

* Fix deleting notifications

* Update apps/labrinth/src/database/models/user_item.rs

Co-authored-by: Josiah Glosson <soujournme@gmail.com>
Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>

* Update apps/labrinth/src/database/models/user_item.rs

Co-authored-by: Josiah Glosson <soujournme@gmail.com>
Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>

* Update Cargo.toml

Co-authored-by: Josiah Glosson <soujournme@gmail.com>
Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>

* Update apps/labrinth/migrations/20250902133943_notification-extension.sql

Co-authored-by: Josiah Glosson <soujournme@gmail.com>
Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>

* Address review comments

* Fix compliation

* Update apps/labrinth/src/database/models/users_notifications_preferences_item.rs

Co-authored-by: Josiah Glosson <soujournme@gmail.com>
Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>

* Use strfmt to format emails

* Configurable Reply-To

* Configurable Reply-To

* Refactor for email background task

* Send some emails inline

* Fix account creation email check

* Revert "Use strfmt to format emails"

This reverts commit e0d6614afe51fa6349918377e953ba294c34ae0b.

* Reintroduce fill_template

* Set password reset email inline

* Process more emails per index

* clippy fmt

* Query cache

---------

Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Josiah Glosson <soujournme@gmail.com>

apps/labrinth/src/auth/email/mod.rs

@@ -1,95 +0,0 @@
-use lettre::message::Mailbox;
-use lettre::message::header::ContentType;
-use lettre::transport::smtp::authentication::Credentials;
-use lettre::transport::smtp::client::{Tls, TlsParameters};
-use lettre::{Message, SmtpTransport, Transport};
-use thiserror::Error;
-use tracing::warn;
-
-#[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 from_name = dotenvy::var("SMTP_FROM_NAME")
-        .unwrap_or_else(|_| "Modrinth".to_string());
-    let from_address = dotenvy::var("SMTP_FROM_ADDRESS")
-        .unwrap_or_else(|_| "no-reply@mail.modrinth.com".to_string());
-
-    let email = Message::builder()
-        .from(Mailbox::new(Some(from_name), from_address.parse()?))
-        .to(to.parse()?)
-        .subject(subject)
-        .header(ContentType::TEXT_HTML)
-        .body(body)?;
-
-    let username = dotenvy::var("SMTP_USERNAME")?;
-    let password = dotenvy::var("SMTP_PASSWORD")?;
-    let host = dotenvy::var("SMTP_HOST")?;
-    let port = dotenvy::var("SMTP_PORT")?.parse::<u16>().unwrap_or(465);
-    let creds =
-        (!username.is_empty()).then(|| Credentials::new(username, password));
-    let tls_setting = match dotenvy::var("SMTP_TLS")?.as_str() {
-        "none" => Tls::None,
-        "opportunistic_start_tls" => {
-            Tls::Opportunistic(TlsParameters::new(host.to_string())?)
-        }
-        "requires_start_tls" => {
-            Tls::Required(TlsParameters::new(host.to_string())?)
-        }
-        "tls" => Tls::Wrapper(TlsParameters::new(host.to_string())?),
-        _ => {
-            warn!("Unrecognized SMTP TLS setting. Defaulting to TLS.");
-            Tls::Wrapper(TlsParameters::new(host.to_string())?)
-        }
-    };
-
-    let mut mailer = SmtpTransport::relay(&host)?.port(port).tls(tls_setting);
-    if let Some(creds) = creds {
-        mailer = mailer.credentials(creds);
-    }
-
-    mailer.build().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(())
-}

apps/labrinth/src/auth/mod.rs

@@ -1,5 +1,4 @@
 pub mod checks;
-pub mod email;
 pub mod oauth;
 pub mod templates;
 pub mod validate;
@@ -8,9 +7,7 @@ pub use checks::{
     filter_visible_collections, filter_visible_project_ids,
     filter_visible_projects,
 };
-pub use email::send_email;
 use serde::{Deserialize, Serialize};
-// pub use pat::{generate_pat, PersonalAccessToken};
 pub use validate::{check_is_moderator_from_headers, get_user_from_headers};
 
 use crate::file_hosting::FileHostingError;
@@ -36,7 +33,7 @@ pub enum AuthenticationError {
     #[error("Error while decoding PAT: {0}")]
     Decoding(#[from] ariadne::ids::DecodingError),
     #[error("{0}")]
-    Mail(#[from] email::MailError),
+    Mail(#[from] crate::queue::email::MailError),
     #[error("Invalid Authentication Credentials")]
     InvalidCredentials,
     #[error("Authentication method was not valid")]