add: channels, messages

crates/core/src/model/channels.rs

@@ -18,11 +18,17 @@ pub struct Channel {
     ///
     /// Top (0) to bottom.
     pub position: usize,
+    /// The members of the chat (ids). Should be empty if `community > 0`.
+    ///
+    /// The owner should not be a member of the channel since any member can update members.
+    pub members: Vec<usize>,
+    /// The title of the channel.
+    pub title: String,
 }
 
 impl Channel {
     /// Create a new [`Channel`].
-    pub fn new(community: usize, owner: usize, position: usize) -> Self {
+    pub fn new(community: usize, owner: usize, position: usize, title: String) -> Self {
         Self {
             id: AlmostSnowflake::new(1234567890)
                 .to_string()
@@ -34,8 +40,32 @@ impl Channel {
             minimum_role_read: (CommunityPermission::DEFAULT | CommunityPermission::MEMBER).bits(),
             minimum_role_write: (CommunityPermission::DEFAULT | CommunityPermission::MEMBER).bits(),
             position,
+            members: Vec::new(),
+            title,
         }
     }
+
+    /// Check if the given `uid` can post in the channel.
+    pub fn check_post(&self, uid: usize, membership: Option<CommunityPermission>) -> bool {
+        let mut is_member = false;
+
+        if let Some(membership) = membership {
+            is_member = membership.bits() >= self.minimum_role_write
+        }
+
+        (uid == self.owner) | is_member | self.members.contains(&uid)
+    }
+
+    /// Check if the given `uid` can post in the channel.
+    pub fn check_read(&self, uid: usize, membership: Option<CommunityPermission>) -> bool {
+        let mut is_member = false;
+
+        if let Some(membership) = membership {
+            is_member = membership.bits() >= self.minimum_role_read
+        }
+
+        (uid == self.owner) | is_member | self.members.contains(&uid)
+    }
 }
 
 #[derive(Serialize, Deserialize)]