1 files changed, 18 insertions, 2 deletions
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/transfers.js b/packages/meshbay-hub/src/meshbay_hub/static/transfers.js
index 1ad1ec5..fa34c67 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/transfers.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/transfers.js
@@ -56,6 +56,9 @@ export class TransferStore {
       error: it.error || '',
       speed: this._speed(it),
       percent: it.total ? Math.min(100, Math.round(it.done / it.total * 100)) : 0,
+      // Only for a file written into a folder the browser granted us: that is
+      // the one case where the page can read its own download back.
+      canOpen: it.status === 'done' && typeof it.open === 'function',
     }));
   }
 
@@ -79,10 +82,10 @@ export class TransferStore {
    * `run` receives `{ signal, onProgress }`. It must poll `signal.aborted` — a
    * cancel that only sets a flag nobody reads is a button that lies.
    */
-  start({ kind, name, total = 0, transport = null, run }) {
+  start({ kind, name, total = 0, transport = null, run, open = null }) {
     const item = {
       id: _nextId++,
-      kind, name, total, transport,
+      kind, name, total, transport, open,
       done: 0,
       status: 'running',
       error: '',
@@ -128,6 +131,19 @@ export class TransferStore {
     return item.id;
   }
 
+  /**
+   * Hand a finished download to the browser to display.
+   *
+   * As close to "open it" as a web page gets: the bytes go to a new tab and the
+   * browser decides what to do with them. A page cannot start a desktop
+   * application, and cannot show a file manager — there is no API for either,
+   * in any browser, by design.
+   */
+  open(id) {
+    const item = this._items.find(it => it.id === id);
+    if (item && typeof item.open === 'function') return item.open();
+  }
+
   cancel(id) {
     const item = this._items.find(it => it.id === id);
     if (!item || item.status !== 'running') return;