add edit/delete game capabilities

backend/src/store.rs

@@ -1,5 +1,6 @@
 use crate::items::{Game, Person};
 use serde::{Deserialize, Serialize};
+use std::collections::HashSet;
 use std::fs::File;
 use std::io::BufReader;
 
@@ -30,6 +31,7 @@ pub struct PersistentState {
 }
 
 pub const STATE_FILE: &str = "state.json";
+pub const ADMINS_FILE: &str = "admins.json";
 
 pub fn save_state(games: &[Game], users: &[User]) {
     let mut games = games.to_vec();
@@ -57,3 +59,17 @@ pub fn load_state() -> Option<(Vec<Game>, Vec<User>)> {
     }
     None
 }
+
+pub fn load_admins() -> HashSet<String> {
+    if let Ok(file) = File::open(ADMINS_FILE) {
+        let reader = BufReader::new(file);
+        if let Ok(admins) = serde_json::from_reader::<_, Vec<String>>(reader) {
+            return admins.into_iter().map(|s| s.to_lowercase()).collect();
+        }
+    }
+    HashSet::new()
+}
+
+pub fn is_admin(username: &str, admins: &HashSet<String>) -> bool {
+    admins.contains(&username.to_lowercase())
+}