allow specifying access key for backing up private demos

src/backup.rs

@@ -1,5 +1,5 @@
-use crate::store::Store;
 use crate::Error;
+use crate::store::Store;
 use demostf_client::{ApiClient, Demo, ListOrder, ListParams};
 use std::time::Duration;
 use tokio::time::timeout;
@@ -11,11 +11,13 @@ pub struct Backup {
 }
 
 impl Backup {
-    pub fn new(store: Store) -> Self {
-        Backup {
-            store,
-            client: ApiClient::new(),
+    pub fn new(store: Store, access_key: Option<String>) -> Self {
+        let mut client = ApiClient::new();
+        if let Some(access_key) = access_key {
+            info!("using access key");
+            client.set_access_key(access_key);
         }
+        Backup { store, client }
     }
 
     #[instrument(skip_all, fields(demo.id = demo.id, demo.name = name))]

src/main.rs

@@ -29,7 +29,13 @@ async fn main() -> Result<(), MainError> {
     let mut args: HashMap<_, _> = dotenvy::vars().collect();
     let store = Store::new(args.get("STORAGE_ROOT").expect("no STORAGE_ROOT set"));
     let state_path = PathBuf::from(args.remove("STATE_FILE").expect("no STATE_FILE set"));
-    let backup = Backup::new(store);
+    let key_file = args.remove("ACCESS_KEY_FILE");
+    let access_key = key_file
+        .as_deref()
+        .map(secretfile::load)
+        .transpose()?
+        .filter(|key| !key.is_empty());
+    let backup = Backup::new(store, access_key);
 
     let last_page = if state_path.is_file() {
         max(