add: individual topic write permissions

crates/core/src/database/posts.rs

@@ -1783,6 +1783,28 @@ impl DataManager {
         }
     }
 
+    /// Check if the given `uid` can post in the given `community` with the given `access`.
+    pub async fn check_can_post_with_access(
+        &self,
+        community: &Community,
+        access: &CommunityWriteAccess,
+        uid: usize,
+    ) -> bool {
+        match *access {
+            CommunityWriteAccess::Owner => uid == community.owner,
+            CommunityWriteAccess::Joined => {
+                match self
+                    .get_membership_by_owner_community(uid, community.id)
+                    .await
+                {
+                    Ok(m) => m.role.check_member(),
+                    Err(_) => false,
+                }
+            }
+            _ => true,
+        }
+    }
+
     /// Create a new post in the database.
     ///
     /// # Arguments
@@ -1840,7 +1862,15 @@ impl DataManager {
                 ));
             }
 
-            if community.topics.get(&data.topic).is_none() {
+            if let Some(topic) = community.topics.get(&data.topic) {
+                // check permission
+                if !self
+                    .check_can_post_with_access(&community, &topic.write_access, data.owner)
+                    .await
+                {
+                    return Err(Error::NotAllowed);
+                }
+            } else {
                 return Err(Error::GeneralNotFound("topic".to_string()));
             }
         }

crates/core/src/model/communities.rs

@@ -541,6 +541,8 @@ pub struct ForumTopic {
     pub description: String,
     pub color: String,
     pub position: i32,
+    #[serde(default)]
+    pub write_access: CommunityWriteAccess,
 }
 
 impl ForumTopic {
@@ -549,7 +551,13 @@ impl ForumTopic {
     /// # Returns
     /// * ID for [`Community`] hashmap
     /// * [`ForumTopic`]
-    pub fn new(title: String, description: String, color: String, position: i32) -> (usize, Self) {
+    pub fn new(
+        title: String,
+        description: String,
+        color: String,
+        position: i32,
+        write_access: CommunityWriteAccess,
+    ) -> (usize, Self) {
         (
             Snowflake::new().to_string().parse::<usize>().unwrap(),
             Self {
@@ -557,6 +565,7 @@ impl ForumTopic {
                 description,
                 color,
                 position,
+                write_access,
             },
         )
     }