add backup encryption key

crates/device/src/lib.rs

@@ -1,5 +1,6 @@
 use std::cell::Cell;
 use std::collections::{HashMap, HashSet};
+use std::path::PathBuf;
 use std::rc::Rc;
 use std::time::Duration;
 
@@ -34,8 +35,8 @@ impl Global for GlobalDeviceRegistry {}
 pub enum DeviceEvent {
     /// A new encryption signer has been set
     Set,
-    /// The encryption key has been reset
-    Reset,
+    /// The device is requesting an encryption key
+    Requesting,
     /// Encryption key is not set
     NotSet { reason: SharedString },
     /// An event to notify that Coop isn't subscribed to gift wrap events
@@ -288,6 +289,21 @@ impl DeviceRegistry {
         })
     }
 
+    /// Backup the encryption's secret key to a file
+    pub fn backup(&self, path: PathBuf, cx: &App) -> Task<Result<(), Error>> {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+
+        cx.background_spawn(async move {
+            let keys = get_keys(&client).await?;
+            let content = keys.secret_key().to_bech32()?;
+
+            smol::fs::write(path, &content).await?;
+
+            Ok(())
+        })
+    }
+
     /// Get device announcement for current user
     pub fn get_announcement(&mut self, cx: &mut Context<Self>) {
         let nostr = NostrRegistry::global(cx);
@@ -507,6 +523,8 @@ impl DeviceRegistry {
                     this.update(cx, |this, cx| {
                         this.set_requesting(true, cx);
                         this.wait_for_approval(cx);
+
+                        cx.emit(DeviceEvent::Requesting);
                     })?;
                 }
                 Err(e) => {