feat: support downloading via token auth (#603)

tests/auth.rs

@@ -348,3 +348,19 @@ fn auth_shadow(
 
     Ok(())
 }
+
+#[rstest]
+fn token_auth(#[with(&["-a", "user:pass@/"])] server: TestServer) -> Result<(), Error> {
+    let url = format!("{}index.html", server.url());
+    let resp = fetch!(b"GET", &url).send()?;
+    assert_eq!(resp.status(), 401);
+    let url = format!("{}index.html?tokengen", server.url());
+    let resp = fetch!(b"GET", &url)
+        .basic_auth("user", Some("pass"))
+        .send()?;
+    let token = resp.text()?;
+    let url = format!("{}index.html?token={token}", server.url());
+    let resp = fetch!(b"GET", &url).send()?;
+    assert_eq!(resp.status(), 200);
+    Ok(())
+}