feat: implement album sharing functionality with permissions management

libertas_core/src/authz.rs

@@ -1,6 +1,6 @@
 use uuid::Uuid;
 
-use crate::models::{Album, Media, Role, User};
+use crate::models::{Album, AlbumPermission, Media, Role, User};
 
 pub trait Ownable {
     fn owner_id(&self) -> Uuid;
@@ -23,3 +23,19 @@ pub fn is_admin(user: &User) -> bool {
 pub fn is_owner(user_id: Uuid, entity: &impl Ownable) -> bool {
     user_id == entity.owner_id()
 }
+
+pub fn can_view_album(
+    user_id: Uuid,
+    album: &Album,
+    share_permission: Option<AlbumPermission>,
+) -> bool {
+    is_owner(user_id, album) || share_permission.is_some()
+}
+
+pub fn can_contribute_to_album(
+    user_id: Uuid,
+    album: &Album,
+    share_permission: Option<AlbumPermission>,
+) -> bool {
+    is_owner(user_id, album) || share_permission == Some(AlbumPermission::Contribute)
+}