Custom Emails (#4526)

* Dynamic email template

* Set lower cache expiry for templates

* Custom email route

* Fix subject line on custom emails

* chore: query cache, clippy, fmt

* Bugfixes

* Key-based caching on custom emails

* Sequentially process emails prone to causing cache stampede

* Fill variables in dynamic body + subject line

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

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

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

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

---------

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

apps/labrinth/src/models/v2/notifications.rs

@@ -139,6 +139,11 @@ pub enum LegacyNotificationBody {
         amount: u64,
         date_available: DateTime<Utc>,
     },
+    Custom {
+        key: String,
+        title: String,
+        body_md: String,
+    },
     Unknown,
 }
 
@@ -217,6 +222,7 @@ impl LegacyNotification {
             NotificationBody::PayoutAvailable { .. } => {
                 Some("payout_available".to_string())
             }
+            NotificationBody::Custom { .. } => Some("custom".to_string()),
             NotificationBody::LegacyMarkdown {
                 notification_type, ..
             } => notification_type.clone(),
@@ -378,6 +384,15 @@ impl LegacyNotification {
                 service,
                 currency,
             },
+            NotificationBody::Custom {
+                title,
+                body_md,
+                key,
+            } => LegacyNotificationBody::Custom {
+                title,
+                body_md,
+                key,
+            },
             NotificationBody::PaymentFailed { amount, service } => {
                 LegacyNotificationBody::PaymentFailed { amount, service }
             }

apps/labrinth/src/models/v3/notifications.rs

@@ -56,6 +56,7 @@ pub enum NotificationType {
     ProjectStatusNeutral,
     ProjectTransferred,
     PayoutAvailable,
+    Custom,
     Unknown,
 }
 
@@ -89,6 +90,7 @@ impl NotificationType {
             NotificationType::ProjectStatusApproved => {
                 "project_status_approved"
             }
+            NotificationType::Custom => "custom",
             NotificationType::ProjectStatusNeutral => "project_status_neutral",
             NotificationType::ProjectTransferred => "project_transferred",
             NotificationType::Unknown => "unknown",
@@ -125,6 +127,7 @@ impl NotificationType {
             }
             "project_status_neutral" => NotificationType::ProjectStatusNeutral,
             "project_transferred" => NotificationType::ProjectTransferred,
+            "custom" => NotificationType::Custom,
             "unknown" => NotificationType::Unknown,
             _ => NotificationType::Unknown,
         }
@@ -236,6 +239,11 @@ pub enum NotificationBody {
         date_available: DateTime<Utc>,
         amount: u64,
     },
+    Custom {
+        key: String,
+        title: String,
+        body_md: String,
+    },
     Unknown,
 }
 
@@ -313,6 +321,7 @@ impl NotificationBody {
             NotificationBody::PayoutAvailable { .. } => {
                 NotificationType::PayoutAvailable
             }
+            NotificationBody::Custom { .. } => NotificationType::Custom,
             NotificationBody::Unknown => NotificationType::Unknown,
         }
     }
@@ -557,6 +566,12 @@ impl From<DBNotification> for Notification {
                     "#".to_string(),
                     vec![],
                 ),
+                NotificationBody::Custom { title, .. } => (
+                    "Notification".to_string(),
+                    title.clone(),
+                    "#".to_string(),
+                    vec![],
+                ),
                 NotificationBody::Unknown => {
                     ("".to_string(), "".to_string(), "#".to_string(), vec![])
                 }