add: circle stacks

crates/app/src/routes/api/v1/stacks.rs

@@ -5,11 +5,14 @@ use axum::{
     Extension, Json,
 };
 use axum_extra::extract::CookieJar;
-use tetratto_core::model::{
-    oauth,
-    permissions::FinePermission,
-    stacks::{StackBlock, StackPrivacy, UserStack},
-    ApiReturn, Error,
+use tetratto_core::{
+    model::{
+        oauth,
+        permissions::FinePermission,
+        stacks::{StackBlock, StackMode, StackPrivacy, UserStack},
+        ApiReturn, Error,
+    },
+    DataManager,
 };
 use super::{
     AddOrRemoveStackUser, CreateStack, UpdateStackMode, UpdateStackName, UpdateStackPrivacy,
@@ -161,6 +164,25 @@ pub async fn add_user_request(
     };
 
     stack.users.push(other_user.id);
+
+    // check number of stacks
+    let owner = match data.get_user_by_id(stack.owner).await {
+        Ok(ua) => ua,
+        Err(e) => return Json(e.into()),
+    };
+
+    if !owner.permissions.check(FinePermission::SUPPORTER) {
+        if stack.users.len() >= DataManager::MAXIMUM_FREE_STACK_USERS {
+            return Json(
+                Error::MiscError(
+                    "This stack already has the maximum users it can have".to_string(),
+                )
+                .into(),
+            );
+        }
+    }
+
+    // ...
     match data.update_stack_users(id, &user, stack.users).await {
         Ok(_) => Json(ApiReturn {
             ok: true,
@@ -250,6 +272,7 @@ pub async fn get_users_request(
 
     if stack.privacy == StackPrivacy::Private
         && user.id != stack.owner
+        && !(stack.mode == StackMode::Circle && stack.users.contains(&user.id))
         && !user.permissions.check(FinePermission::MANAGE_STACKS)
     {
         return Json(Error::NotAllowed.into());