feat(gpodder): add admin paginated users method

gpodder/src/repository/admin.rs

@@ -1,7 +1,13 @@
-use crate::models;
+use crate::{AuthErr, Page, models};
 
 /// Admin view of the repository, providing methods only allowed by admins
 pub struct AdminRepository<'a> {
     pub(crate) store: &'a (dyn super::GpodderStore + Send + Sync),
     pub(crate) user: &'a models::User,
 }
+
+impl<'a> AdminRepository<'a> {
+    pub fn paginated_users(&self, page: Page) -> Result<Vec<models::User>, AuthErr> {
+        self.store.paginated_users(page)
+    }
+}

gpodder/src/store.rs

@@ -64,6 +64,9 @@ pub trait GpodderAuthStore {
 
     /// Remove any sessions whose last_seen timestamp is before the given minimum value
     fn remove_old_sessions(&self, min_last_seen: DateTime<Utc>) -> Result<usize, AuthErr>;
+
+    /// Return the given page of users, ordered by username
+    fn paginated_users(&self, page: Page) -> Result<Vec<User>, AuthErr>;
 }
 
 pub trait GpodderDeviceStore {

gpodder_sqlite/src/repository/auth.rs

@@ -142,4 +142,17 @@ impl gpodder::GpodderAuthStore for SqliteRepository {
         })()
         .map_err(AuthErr::from)
     }
+
+    fn paginated_users(&self, page: gpodder::Page) -> Result<Vec<gpodder::User>, AuthErr> {
+        Ok(users::table
+            .select(User::as_select())
+            .order(users::username.asc())
+            .offset((page.page * page.per_page) as i64)
+            .limit(page.per_page as i64)
+            .get_results(&mut self.pool.get().map_err(DbError::from)?)
+            .map_err(DbError::from)?
+            .into_iter()
+            .map(gpodder::User::from)
+            .collect())
+    }
 }