add: mail base

crates/core/src/model/mail.rs

@@ -0,0 +1,35 @@
+use serde::{Serialize, Deserialize};
+use tetratto_shared::{snow::Snowflake, unix_epoch_timestamp};
+
+/// A letter is the most basic structure of the mail system. Letters are sent
+/// and received by users.
+#[derive(Serialize, Deserialize)]
+pub struct Letter {
+    pub id: usize,
+    pub created: usize,
+    pub owner: usize,
+    pub receivers: Vec<usize>,
+    pub subject: String,
+    pub content: String,
+    /// The ID of every use who has read the letter. Can be checked in the UI
+    /// with `user.id in letter.read_by`.
+    ///
+    /// This field can be updated by anyone in the letter's `receivers` field.
+    /// Other fields in the letter can only be updated by the letter's `owner`.
+    pub read_by: Vec<usize>,
+}
+
+impl Letter {
+    /// Create a new [`Letter`].
+    pub fn new(owner: usize, receivers: Vec<usize>, subject: String, content: String) -> Self {
+        Self {
+            id: Snowflake::new().to_string().parse::<usize>().unwrap(),
+            created: unix_epoch_timestamp(),
+            owner,
+            receivers,
+            subject,
+            content,
+            read_by: Vec::new(),
+        }
+    }
+}

crates/core/src/model/mod.rs

@@ -7,6 +7,7 @@ pub mod communities;
 pub mod communities_permissions;
 pub mod journals;
 pub mod littleweb;
+pub mod mail;
 pub mod moderation;
 pub mod oauth;
 pub mod permissions;

crates/core/src/model/permissions.rs

@@ -178,6 +178,7 @@ bitflags! {
         const MANAGE_SERVICES = 1 << 3;
         const MANAGE_PRODUCTS = 1 << 4;
         const DEVELOPER_PASS = 1 << 5;
+        const MANAGE_LETTERS = 1 << 6;
 
         const _ = !0;
     }