add: invite codes

crates/core/src/model/auth.rs

@@ -49,6 +49,9 @@ pub struct User {
     /// A list of the IDs of all accounts the user has signed into through the UI.
     #[serde(default)]
     pub associated: Vec<usize>,
+    /// The ID of the [`InviteCode`] this user provided during registration.
+    #[serde(default)]
+    pub invite_code: usize,
 }
 
 pub type UserConnections =
@@ -283,6 +286,7 @@ impl User {
             stripe_id: String::new(),
             grants: Vec::new(),
             associated: Vec::new(),
+            invite_code: 0,
         }
     }
 
@@ -591,3 +595,25 @@ impl UserWarning {
         }
     }
 }
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct InviteCode {
+    pub id: usize,
+    pub created: usize,
+    pub owner: usize,
+    pub code: String,
+    pub is_used: bool,
+}
+
+impl InviteCode {
+    /// Create a new [`InviteCode`].
+    pub fn new(owner: usize) -> Self {
+        Self {
+            id: Snowflake::new().to_string().parse::<usize>().unwrap(),
+            created: unix_epoch_timestamp(),
+            owner,
+            code: salt(),
+            is_used: false,
+        }
+    }
+}