Cargo.lock

@@ -1005,6 +1005,7 @@ version = "0.3.0"
 dependencies = [
  "anyhow",
  "common",
+ "device",
  "flume",
  "futures",
  "fuzzy-matcher",
@@ -1288,6 +1289,7 @@ dependencies = [
  "chat",
  "chat_ui",
  "common",
+ "device",
  "futures",
  "gpui",
  "gpui_tokio",
@@ -1607,6 +1609,24 @@ dependencies = [
  "syn 2.0.114",
 ]
 
+[[package]]
+name = "device"
+version = "0.3.0"
+dependencies = [
+ "anyhow",
+ "common",
+ "flume",
+ "gpui",
+ "itertools 0.13.0",
+ "log",
+ "nostr-sdk",
+ "serde",
+ "serde_json",
+ "smallvec",
+ "smol",
+ "state",
+]
+
 [[package]]
 name = "digest"
 version = "0.10.7"

crates/chat/Cargo.toml

@@ -7,6 +7,7 @@ publish.workspace = true
 [dependencies]
 common = { path = "../common" }
 state = { path = "../state" }
+device = { path = "../device" }
 person = { path = "../person" }
 settings = { path = "../settings" }
 

crates/chat/src/lib.rs

@@ -7,6 +7,7 @@ use std::time::Duration;
 
 use anyhow::{anyhow, Context as AnyhowContext, Error};
 use common::EventUtils;
+use device::DeviceRegistry;
 use flume::Sender;
 use fuzzy_matcher::skim::SkimMatcherV2;
 use fuzzy_matcher::FuzzyMatcher;
@@ -96,7 +97,9 @@ impl ChatRegistry {
     fn new(cx: &mut Context<Self>) -> Self {
         let nostr = NostrRegistry::global(cx);
         let identity = nostr.read(cx).identity();
-        let device_signer = nostr.read(cx).device_signer();
+
+        let device = DeviceRegistry::global(cx);
+        let device_signer = device.read(cx).device_signer.clone();
 
         // A flag to indicate if the registry is loading
         let tracking_flag = Arc::new(AtomicBool::new(true));
@@ -172,7 +175,9 @@ impl ChatRegistry {
     fn handle_notifications(&mut self, cx: &mut Context<Self>) {
         let nostr = NostrRegistry::global(cx);
         let client = nostr.read(cx).client();
-        let device_signer = nostr.read(cx).device_signer().read(cx).clone();
+
+        let device = DeviceRegistry::global(cx);
+        let device_signer = device.read(cx).signer(cx);
 
         let status = self.tracking_flag.clone();
         let tx = self.sender.clone();

crates/coop/Cargo.toml

@@ -33,6 +33,7 @@ title_bar = { path = "../title_bar" }
 theme = { path = "../theme" }
 common = { path = "../common" }
 state = { path = "../state" }
+device = { path = "../device" }
 key_store = { path = "../key_store" }
 chat = { path = "../chat" }
 chat_ui = { path = "../chat_ui" }

crates/coop/src/main.rs

@@ -89,6 +89,11 @@ fn main() {
                 // Initialize the nostr client
                 state::init(cx);
 
+                // Initialize device signer
+                //
+                // NIP-4e: https://github.com/nostr-protocol/nips/blob/per-device-keys/4e.md
+                device::init(cx);
+
                 // Initialize settings
                 settings::init(cx);
 

crates/device/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "device"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+common = { path = "../common" }
+state = { path = "../state" }
+
+gpui.workspace = true
+nostr-sdk.workspace = true
+
+anyhow.workspace = true
+itertools.workspace = true
+smallvec.workspace = true
+smol.workspace = true
+log.workspace = true
+flume.workspace = true
+serde.workspace = true
+serde_json.workspace = true

crates/device/src/device.rs

@@ -0,0 +1,62 @@
+use gpui::SharedString;
+use nostr_sdk::prelude::*;
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
+pub enum DeviceState {
+    #[default]
+    Initial,
+    Requesting,
+    Set,
+}
+
+/// Announcement
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Announcement {
+    /// The public key of the device that created this announcement.
+    public_key: PublicKey,
+
+    /// The name of the device that created this announcement.
+    client_name: Option<String>,
+}
+
+impl From<&Event> for Announcement {
+    fn from(val: &Event) -> Self {
+        let public_key = val
+            .tags
+            .iter()
+            .find(|tag| tag.kind().as_str() == "n" || tag.kind().as_str() == "P")
+            .and_then(|tag| tag.content())
+            .and_then(|c| PublicKey::parse(c).ok())
+            .unwrap_or(val.pubkey);
+
+        let client_name = val
+            .tags
+            .find(TagKind::Client)
+            .and_then(|tag| tag.content())
+            .map(|c| c.to_string());
+
+        Self::new(public_key, client_name)
+    }
+}
+
+impl Announcement {
+    pub fn new(public_key: PublicKey, client_name: Option<String>) -> Self {
+        Self {
+            public_key,
+            client_name,
+        }
+    }
+
+    /// Returns the public key of the device that created this announcement.
+    pub fn public_key(&self) -> PublicKey {
+        self.public_key
+    }
+
+    /// Returns the client name of the device that created this announcement.
+    pub fn client_name(&self) -> SharedString {
+        self.client_name
+            .as_ref()
+            .map(SharedString::from)
+            .unwrap_or(SharedString::from("Unknown"))
+    }
+}

crates/device/src/lib.rs

@@ -0,0 +1,512 @@
+use std::collections::HashSet;
+use std::sync::Arc;
+use std::time::Duration;
+
+use anyhow::{anyhow, Context as AnyhowContext, Error};
+use common::app_name;
+pub use device::*;
+use gpui::{App, AppContext, Context, Entity, Global, Subscription, Task};
+use nostr_sdk::prelude::*;
+use smallvec::{smallvec, SmallVec};
+use state::{NostrRegistry, RelayState, GIFTWRAP_SUBSCRIPTION, TIMEOUT};
+
+mod device;
+
+pub fn init(cx: &mut App) {
+    DeviceRegistry::set_global(cx.new(DeviceRegistry::new), cx);
+}
+
+struct GlobalDeviceRegistry(Entity<DeviceRegistry>);
+
+impl Global for GlobalDeviceRegistry {}
+
+/// Device Registry
+#[derive(Debug)]
+pub struct DeviceRegistry {
+    /// Device signer
+    ///
+    /// NIP-4e: https://github.com/nostr-protocol/nips/blob/per-device-keys/4e.md
+    pub device_signer: Entity<Option<Arc<dyn NostrSigner>>>,
+
+    /// Device state
+    ///
+    /// NIP-4e: https://github.com/nostr-protocol/nips/blob/per-device-keys/4e.md
+    state: Entity<DeviceState>,
+
+    /// Async tasks
+    tasks: Vec<Task<Result<(), Error>>>,
+
+    /// Subscriptions
+    _subscriptions: SmallVec<[Subscription; 1]>,
+}
+
+impl DeviceRegistry {
+    /// Retrieve the global device registry state
+    pub fn global(cx: &App) -> Entity<Self> {
+        cx.global::<GlobalDeviceRegistry>().0.clone()
+    }
+
+    /// Set the global device registry instance
+    fn set_global(state: Entity<Self>, cx: &mut App) {
+        cx.set_global(GlobalDeviceRegistry(state));
+    }
+
+    /// Create a new device registry instance
+    fn new(cx: &mut Context<Self>) -> Self {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+        let identity = nostr.read(cx).identity();
+
+        let device_signer = cx.new(|_| None);
+        let state = cx.new(|_| DeviceState::default());
+
+        // Channel for communication between nostr and gpui
+        let (tx, rx) = flume::bounded::<Event>(100);
+
+        let mut subscriptions = smallvec![];
+        let mut tasks = vec![];
+
+        subscriptions.push(
+            // Observe the identity entity
+            cx.observe(&identity, |this, state, cx| {
+                if state.read(cx).has_public_key() {
+                    if state.read(cx).relay_list_state() == RelayState::Set {
+                        this.get_announcement(cx);
+                    }
+                    if state.read(cx).messaging_relays_state() == RelayState::Set {
+                        this.get_messages(cx);
+                    }
+                }
+            }),
+        );
+
+        tasks.push(
+            // Handle nostr notifications
+            cx.background_spawn(async move { Self::handle_notifications(&client, &tx).await }),
+        );
+
+        tasks.push(
+            // Update GPUI states
+            cx.spawn(async move |this, cx| {
+                while let Ok(event) = rx.recv_async().await {
+                    match event.kind {
+                        Kind::Custom(4454) => {
+                            //
+                        }
+                        Kind::Custom(4455) => {
+                            //
+                        }
+                        _ => {}
+                    }
+                }
+
+                Ok(())
+            }),
+        );
+
+        Self {
+            device_signer,
+            state,
+            tasks,
+            _subscriptions: subscriptions,
+        }
+    }
+
+    /// Returns the device signer entity
+    pub fn signer(&self, cx: &App) -> Option<Arc<dyn NostrSigner>> {
+        self.device_signer.read(cx).clone()
+    }
+
+    /// Set the decoupled encryption key for the current user
+    fn set_device_signer<S>(&mut self, signer: S, cx: &mut Context<Self>)
+    where
+        S: NostrSigner + 'static,
+    {
+        self.device_signer.update(cx, |this, cx| {
+            *this = Some(Arc::new(signer));
+            cx.notify();
+        });
+        self.state.update(cx, |this, cx| {
+            *this = DeviceState::Set;
+            cx.notify();
+        });
+    }
+
+    /// Handle nostr notifications
+    async fn handle_notifications(client: &Client, tx: &flume::Sender<Event>) -> Result<(), Error> {
+        let mut notifications = client.notifications();
+        let mut processed_events = HashSet::new();
+
+        while let Ok(notification) = notifications.recv().await {
+            if let RelayPoolNotification::Message {
+                message: RelayMessage::Event { event, .. },
+                ..
+            } = notification
+            {
+                if !processed_events.insert(event.id) {
+                    // Skip if the event has already been processed
+                    continue;
+                }
+
+                match event.kind {
+                    Kind::Custom(4454) => {
+                        if Self::verify_author(client, event.as_ref()).await {
+                            tx.send_async(event.into_owned()).await.ok();
+                        }
+                    }
+                    Kind::Custom(4455) => {
+                        if Self::verify_author(client, event.as_ref()).await {
+                            tx.send_async(event.into_owned()).await.ok();
+                        }
+                    }
+                    _ => {}
+                }
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Verify the author of an event
+    async fn verify_author(client: &Client, event: &Event) -> bool {
+        if let Ok(signer) = client.signer().await {
+            if let Ok(public_key) = signer.get_public_key().await {
+                return public_key == event.pubkey;
+            }
+        }
+        false
+    }
+
+    /// Continuously get gift wrap events for the current user in their messaging relays
+    fn get_messages(&mut self, cx: &mut Context<Self>) {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+        let device_signer = self.device_signer.read(cx).clone();
+
+        let public_key = nostr.read(cx).identity().read(cx).public_key();
+        let messaging_relays = nostr.read(cx).messaging_relays(&public_key, cx);
+
+        cx.background_spawn(async move {
+            let urls = messaging_relays.await;
+            let id = SubscriptionId::new(GIFTWRAP_SUBSCRIPTION);
+            let mut filters = vec![];
+
+            // Construct a filter to get user messages
+            filters.push(Filter::new().kind(Kind::GiftWrap).pubkey(public_key));
+
+            // Construct a filter to get dekey messages if available
+            if let Some(signer) = device_signer.as_ref() {
+                if let Ok(pubkey) = signer.get_public_key().await {
+                    filters.push(Filter::new().kind(Kind::GiftWrap).pubkey(pubkey));
+                }
+            }
+
+            if let Err(e) = client.subscribe_with_id_to(urls, id, filters, None).await {
+                log::error!("Failed to subscribe to gift wrap events: {e}");
+            }
+        })
+        .detach();
+    }
+
+    /// Get device announcement for current user
+    fn get_announcement(&mut self, cx: &mut Context<Self>) {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+
+        let public_key = nostr.read(cx).identity().read(cx).public_key();
+        let write_relays = nostr.read(cx).write_relays(&public_key, cx);
+
+        let task: Task<Result<Event, Error>> = cx.background_spawn(async move {
+            let urls = write_relays.await;
+
+            // Construct the filter for the device announcement event
+            let filter = Filter::new()
+                .kind(Kind::Custom(10044))
+                .author(public_key)
+                .limit(1);
+
+            let mut stream = client
+                .stream_events_from(&urls, vec![filter], Duration::from_secs(TIMEOUT))
+                .await?;
+
+            while let Some((_url, res)) = stream.next().await {
+                match res {
+                    Ok(event) => {
+                        log::info!("Received device announcement event: {event:?}");
+                        return Ok(event);
+                    }
+                    Err(e) => {
+                        log::error!("Failed to receive device announcement event: {e}");
+                    }
+                }
+            }
+
+            Err(anyhow!("Device announcement not found"))
+        });
+
+        self.tasks.push(cx.spawn(async move |this, cx| {
+            match task.await {
+                Ok(event) => {
+                    this.update(cx, |this, cx| {
+                        this.init_device_signer(&event, cx);
+                    })?;
+                }
+                Err(_) => {
+                    this.update(cx, |this, cx| {
+                        this.announce_device(cx);
+                    })?;
+                }
+            }
+
+            Ok(())
+        }));
+    }
+
+    /// Create a new device signer and announce it
+    fn announce_device(&mut self, cx: &mut Context<Self>) {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+
+        let public_key = nostr.read(cx).identity().read(cx).public_key();
+        let write_relays = nostr.read(cx).write_relays(&public_key, cx);
+
+        let keys = Keys::generate();
+        let secret = keys.secret_key().to_secret_hex();
+        let n = keys.public_key();
+
+        let task: Task<Result<(), Error>> = cx.background_spawn(async move {
+            let signer = client.signer().await?;
+            let urls = write_relays.await;
+
+            // Construct an announcement event
+            let event = EventBuilder::new(Kind::Custom(10044), "")
+                .tags(vec![
+                    Tag::custom(TagKind::custom("n"), vec![n]),
+                    Tag::client(app_name()),
+                ])
+                .sign(&signer)
+                .await?;
+
+            // Publish announcement
+            client.send_event_to(&urls, &event).await?;
+
+            // Encrypt the secret key
+            let encrypted = signer.nip44_encrypt(&public_key, &secret).await?;
+
+            // Construct a storage event
+            let event = EventBuilder::new(Kind::ApplicationSpecificData, encrypted)
+                .tag(Tag::identifier("coop:device"))
+                .sign(&signer)
+                .await?;
+
+            // Save storage event to database
+            //
+            // Note: never publish to any relays
+            client.database().save_event(&event).await?;
+
+            Ok(())
+        });
+
+        cx.spawn(async move |this, cx| {
+            if task.await.is_ok() {
+                this.update(cx, |this, cx| {
+                    this.set_device_signer(keys, cx);
+                    this.listen_device_request(cx);
+                })
+                .ok();
+            }
+        })
+        .detach();
+    }
+
+    /// Initialize device signer (decoupled encryption key) for the current user
+    fn init_device_signer(&mut self, event: &Event, cx: &mut Context<Self>) {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+
+        let announcement = Announcement::from(event);
+        let device_pubkey = announcement.public_key();
+
+        let task: Task<Result<Keys, Error>> = cx.background_spawn(async move {
+            let signer = client.signer().await?;
+            let public_key = signer.get_public_key().await?;
+
+            let filter = Filter::new()
+                .identifier("coop:device")
+                .kind(Kind::ApplicationSpecificData)
+                .author(public_key)
+                .limit(1);
+
+            if let Some(event) = client.database().query(filter).await?.first() {
+                let content = signer.nip44_decrypt(&public_key, &event.content).await?;
+                let secret = SecretKey::parse(&content)?;
+                let keys = Keys::new(secret);
+
+                if keys.public_key() != device_pubkey {
+                    return Err(anyhow!("Key mismatch"));
+                };
+
+                Ok(keys)
+            } else {
+                Err(anyhow!("Key not found"))
+            }
+        });
+
+        cx.spawn(async move |this, cx| {
+            match task.await {
+                Ok(keys) => {
+                    this.update(cx, |this, cx| {
+                        this.set_device_signer(keys, cx);
+                        this.listen_device_request(cx);
+                    })
+                    .ok();
+                }
+                Err(e) => {
+                    this.update(cx, |this, cx| {
+                        this.request_device_keys(cx);
+                        this.listen_device_approval(cx);
+                    })
+                    .ok();
+
+                    log::warn!("Failed to initialize device signer: {e}");
+                }
+            };
+        })
+        .detach();
+    }
+
+    /// Listen for device key requests on user's write relays
+    fn listen_device_request(&mut self, cx: &mut Context<Self>) {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+
+        let public_key = nostr.read(cx).identity().read(cx).public_key();
+        let write_relays = nostr.read(cx).write_relays(&public_key, cx);
+
+        let task: Task<Result<(), Error>> = cx.background_spawn(async move {
+            let urls = write_relays.await;
+
+            // Construct a filter for device key requests
+            let filter = Filter::new()
+                .kind(Kind::Custom(4454))
+                .author(public_key)
+                .since(Timestamp::now());
+
+            // Subscribe to the device key requests on user's write relays
+            client.subscribe_to(&urls, vec![filter], None).await?;
+
+            Ok(())
+        });
+
+        task.detach();
+    }
+
+    /// Listen for device key approvals on user's write relays
+    fn listen_device_approval(&mut self, cx: &mut Context<Self>) {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+
+        let public_key = nostr.read(cx).identity().read(cx).public_key();
+        let write_relays = nostr.read(cx).write_relays(&public_key, cx);
+
+        let task: Task<Result<(), Error>> = cx.background_spawn(async move {
+            let urls = write_relays.await;
+
+            // Construct a filter for device key requests
+            let filter = Filter::new()
+                .kind(Kind::Custom(4455))
+                .author(public_key)
+                .since(Timestamp::now());
+
+            // Subscribe to the device key requests on user's write relays
+            client.subscribe_to(&urls, vec![filter], None).await?;
+
+            Ok(())
+        });
+
+        task.detach();
+    }
+
+    /// Request encryption keys from other device
+    fn request_device_keys(&mut self, cx: &mut Context<Self>) {
+        let nostr = NostrRegistry::global(cx);
+        let client = nostr.read(cx).client();
+
+        let public_key = nostr.read(cx).identity().read(cx).public_key();
+        let write_relays = nostr.read(cx).write_relays(&public_key, cx);
+
+        let app_keys = nostr.read(cx).app_keys().clone();
+        let app_pubkey = app_keys.public_key();
+
+        let task: Task<Result<Option<Keys>, Error>> = cx.background_spawn(async move {
+            let signer = client.signer().await?;
+            let public_key = signer.get_public_key().await?;
+
+            let filter = Filter::new()
+                .kind(Kind::Custom(4455))
+                .author(public_key)
+                .pubkey(app_pubkey)
+                .limit(1);
+
+            match client.database().query(filter).await?.first_owned() {
+                Some(event) => {
+                    let root_device = event
+                        .tags
+                        .find(TagKind::custom("P"))
+                        .and_then(|tag| tag.content())
+                        .and_then(|content| PublicKey::parse(content).ok())
+                        .context("Invalid event's tags")?;
+
+                    let payload = event.content.as_str();
+                    let decrypted = app_keys.nip44_decrypt(&root_device, payload).await?;
+
+                    let secret = SecretKey::from_hex(&decrypted)?;
+                    let keys = Keys::new(secret);
+
+                    Ok(Some(keys))
+                }
+                None => {
+                    let urls = write_relays.await;
+
+                    // Construct an event for device key request
+                    let event = EventBuilder::new(Kind::Custom(4454), "")
+                        .tags(vec![
+                            Tag::client(app_name()),
+                            Tag::custom(TagKind::custom("P"), vec![app_pubkey]),
+                        ])
+                        .sign(&signer)
+                        .await?;
+
+                    // Send the event to write relays
+                    client.send_event_to(&urls, &event).await?;
+
+                    Ok(None)
+                }
+            }
+        });
+
+        cx.spawn(async move |this, cx| {
+            match task.await {
+                Ok(Some(keys)) => {
+                    this.update(cx, |this, cx| {
+                        this.set_device_signer(keys, cx);
+                    })
+                    .ok();
+                }
+                Ok(None) => {
+                    this.update(cx, |this, cx| {
+                        this.state.update(cx, |this, cx| {
+                            *this = DeviceState::Requesting;
+                            cx.notify();
+                        });
+                    })
+                    .ok();
+                }
+                Err(e) => {
+                    log::error!("Failed to request the encryption key: {e}");
+                }
+            };
+        })
+        .detach();
+    }
+}

crates/state/src/lib.rs

@@ -1,9 +1,8 @@
 use std::collections::HashSet;
-use std::sync::Arc;
 use std::time::Duration;
 
-use anyhow::{anyhow, Context as AnyhowContext, Error};
-use common::{app_name, config_dir, BOOTSTRAP_RELAYS, SEARCH_RELAYS};
+use anyhow::Error;
+use common::{config_dir, BOOTSTRAP_RELAYS, SEARCH_RELAYS};
 use gpui::{App, AppContext, Context, Entity, Global, Subscription, Task};
 use nostr_lmdb::NostrLmdb;
 use nostr_sdk::prelude::*;
@@ -53,16 +52,6 @@ pub struct NostrRegistry {
     /// Gossip implementation
     gossip: Entity<Gossip>,
 
-    /// Device signer
-    ///
-    /// NIP-4e: https://github.com/nostr-protocol/nips/blob/per-device-keys/4e.md
-    device_signer: Entity<Option<Arc<dyn NostrSigner>>>,
-
-    /// Device state
-    ///
-    /// NIP-4e: https://github.com/nostr-protocol/nips/blob/per-device-keys/4e.md
-    device_state: Entity<DeviceState>,
-
     /// Tasks for asynchronous operations
     tasks: Vec<Task<Result<(), Error>>>,
 
@@ -120,10 +109,6 @@ impl NostrRegistry {
         // Construct the identity entity
         let identity = cx.new(|_| Identity::default());
 
-        // Construct the device signer entity
-        let device_signer = cx.new(|_| None);
-        let device_state = cx.new(|_| DeviceState::default());
-
         // Channel for communication between nostr and gpui
         let (tx, rx) = flume::bounded::<Event>(2048);
 
@@ -139,16 +124,9 @@ impl NostrRegistry {
                             this.get_relay_list(cx);
                         }
                         RelayState::Set => {
-                            match state.read(cx).messaging_relays_state() {
-                                RelayState::Initial => {
-                                    this.get_profile(cx);
-                                    this.get_announcement(cx);
-                                    this.get_messaging_relays(cx);
-                                }
-                                RelayState::Set => {
-                                    this.get_messages(cx);
-                                }
-                                _ => {}
+                            if state.read(cx).messaging_relays_state() == RelayState::Initial {
+                                this.get_profile(cx);
+                                this.get_messaging_relays(cx);
                             };
                         }
                         _ => {}
@@ -196,8 +174,6 @@ impl NostrRegistry {
             app_keys,
             identity,
             gossip,
-            device_signer,
-            device_state,
             _subscriptions: subscriptions,
             tasks,
         }
@@ -352,11 +328,6 @@ impl NostrRegistry {
         self.identity.clone()
     }
 
-    /// Get current device signer
-    pub fn device_signer(&self) -> Entity<Option<Arc<dyn NostrSigner>>> {
-        self.device_signer.clone()
-    }
-
     /// Get a relay hint (messaging relay) for a given public key
     pub fn relay_hint(&self, public_key: &PublicKey, cx: &App) -> Option<RelayUrl> {
         self.gossip
@@ -568,58 +539,6 @@ impl NostrRegistry {
         task.detach();
     }
 
-    /// Get device announcement for current user
-    fn get_announcement(&mut self, cx: &mut Context<Self>) {
-        let client = self.client();
-        let public_key = self.identity().read(cx).public_key();
-        let write_relays = self.write_relays(&public_key, cx);
-
-        let task: Task<Result<Event, Error>> = cx.background_spawn(async move {
-            let urls = write_relays.await;
-
-            // Construct the filter for the device announcement event
-            let filter = Filter::new()
-                .kind(Kind::Custom(10044))
-                .author(public_key)
-                .limit(1);
-
-            let mut stream = client
-                .stream_events_from(&urls, vec![filter], Duration::from_secs(TIMEOUT))
-                .await?;
-
-            while let Some((_url, res)) = stream.next().await {
-                match res {
-                    Ok(event) => {
-                        log::info!("Received device announcement event: {event:?}");
-                        return Ok(event);
-                    }
-                    Err(e) => {
-                        log::error!("Failed to receive device announcement event: {e}");
-                    }
-                }
-            }
-
-            Err(anyhow!("Device announcement not found"))
-        });
-
-        self.tasks.push(cx.spawn(async move |this, cx| {
-            match task.await {
-                Ok(event) => {
-                    this.update(cx, |this, cx| {
-                        this.init_device_signer(&event, cx);
-                    })?;
-                }
-                Err(_) => {
-                    this.update(cx, |this, cx| {
-                        this.announce_device(cx);
-                    })?;
-                }
-            }
-
-            Ok(())
-        }));
-    }
-
     /// Get messaging relays for current user
     fn get_messaging_relays(&mut self, cx: &mut Context<Self>) {
         let client = self.client();
@@ -674,285 +593,4 @@ impl NostrRegistry {
             Ok(())
         }));
     }
-
-    /// Continuously get gift wrap events for the current user in their messaging relays
-    fn get_messages(&mut self, cx: &mut Context<Self>) {
-        let client = self.client();
-        let device_signer = self.device_signer().read(cx).clone();
-        let public_key = self.identity().read(cx).public_key();
-        let messaging_relays = self.messaging_relays(&public_key, cx);
-
-        cx.background_spawn(async move {
-            let urls = messaging_relays.await;
-            let id = SubscriptionId::new(GIFTWRAP_SUBSCRIPTION);
-            let mut filters = vec![];
-
-            // Construct a filter to get user messages
-            filters.push(Filter::new().kind(Kind::GiftWrap).pubkey(public_key));
-
-            // Construct a filter to get dekey messages if available
-            if let Some(signer) = device_signer.as_ref() {
-                if let Ok(pubkey) = signer.get_public_key().await {
-                    filters.push(Filter::new().kind(Kind::GiftWrap).pubkey(pubkey));
-                }
-            }
-
-            if let Err(e) = client.subscribe_with_id_to(urls, id, filters, None).await {
-                log::error!("Failed to subscribe to gift wrap events: {e}");
-            }
-        })
-        .detach();
-    }
-
-    /// Set the decoupled encryption key for the current user
-    fn set_device_signer<S>(&mut self, signer: S, cx: &mut Context<Self>)
-    where
-        S: NostrSigner + 'static,
-    {
-        self.device_signer.update(cx, |this, cx| {
-            *this = Some(Arc::new(signer));
-            cx.notify();
-        });
-        self.device_state.update(cx, |this, cx| {
-            *this = DeviceState::Set;
-            cx.notify();
-        });
-    }
-
-    /// Create a new device signer and announce it
-    fn announce_device(&mut self, cx: &mut Context<Self>) {
-        let client = self.client();
-        let public_key = self.identity().read(cx).public_key();
-        let write_relays = self.write_relays(&public_key, cx);
-
-        let keys = Keys::generate();
-        let secret = keys.secret_key().to_secret_hex();
-        let n = keys.public_key();
-
-        let task: Task<Result<(), Error>> = cx.background_spawn(async move {
-            let signer = client.signer().await?;
-            let urls = write_relays.await;
-
-            // Construct an announcement event
-            let event = EventBuilder::new(Kind::Custom(10044), "")
-                .tags(vec![
-                    Tag::custom(TagKind::custom("n"), vec![n]),
-                    Tag::client(app_name()),
-                ])
-                .sign(&signer)
-                .await?;
-
-            // Publish announcement
-            client.send_event_to(&urls, &event).await?;
-
-            // Encrypt the secret key
-            let encrypted = signer.nip44_encrypt(&public_key, &secret).await?;
-
-            // Construct a storage event
-            let event = EventBuilder::new(Kind::ApplicationSpecificData, encrypted)
-                .tag(Tag::identifier("coop:device"))
-                .sign(&signer)
-                .await?;
-
-            // Save storage event to database
-            //
-            // Note: never publish to any relays
-            client.database().save_event(&event).await?;
-
-            Ok(())
-        });
-
-        cx.spawn(async move |this, cx| {
-            if task.await.is_ok() {
-                this.update(cx, |this, cx| {
-                    this.set_device_signer(keys, cx);
-                    this.listen_device_request(cx);
-                })
-                .ok();
-            }
-        })
-        .detach();
-    }
-
-    /// Initialize device signer (decoupled encryption key) for the current user
-    fn init_device_signer(&mut self, event: &Event, cx: &mut Context<Self>) {
-        let client = self.client();
-        let announcement = Announcement::from(event);
-        let device_pubkey = announcement.public_key();
-
-        let task: Task<Result<Keys, Error>> = cx.background_spawn(async move {
-            let signer = client.signer().await?;
-            let public_key = signer.get_public_key().await?;
-
-            let filter = Filter::new()
-                .identifier("coop:device")
-                .kind(Kind::ApplicationSpecificData)
-                .author(public_key)
-                .limit(1);
-
-            if let Some(event) = client.database().query(filter).await?.first() {
-                let content = signer.nip44_decrypt(&public_key, &event.content).await?;
-                let secret = SecretKey::parse(&content)?;
-                let keys = Keys::new(secret);
-
-                if keys.public_key() != device_pubkey {
-                    return Err(anyhow!("Key mismatch"));
-                };
-
-                Ok(keys)
-            } else {
-                Err(anyhow!("Key not found"))
-            }
-        });
-
-        cx.spawn(async move |this, cx| {
-            match task.await {
-                Ok(keys) => {
-                    this.update(cx, |this, cx| {
-                        this.set_device_signer(keys, cx);
-                        this.listen_device_request(cx);
-                    })
-                    .ok();
-                }
-                Err(e) => {
-                    log::warn!("Failed to initialize dekey: {e}");
-                    this.update(cx, |this, cx| {
-                        this.request_device_keys(cx);
-                    })
-                    .ok();
-                }
-            };
-        })
-        .detach();
-    }
-
-    /// Listen for device key requests on user's write relays
-    fn listen_device_request(&mut self, cx: &mut Context<Self>) {
-        let client = self.client();
-        let public_key = self.identity().read(cx).public_key();
-        let write_relays = self.write_relays(&public_key, cx);
-
-        let task: Task<Result<(), Error>> = cx.background_spawn(async move {
-            let urls = write_relays.await;
-
-            // Construct a filter for device key requests
-            let filter = Filter::new()
-                .kind(Kind::Custom(4454))
-                .author(public_key)
-                .since(Timestamp::now());
-
-            // Subscribe to the device key requests on user's write relays
-            client.subscribe_to(&urls, vec![filter], None).await?;
-
-            Ok(())
-        });
-
-        task.detach();
-    }
-
-    /// Listen for device key approvals on user's write relays
-    fn listen_device_approval(&mut self, cx: &mut Context<Self>) {
-        let client = self.client();
-        let public_key = self.identity().read(cx).public_key();
-        let write_relays = self.write_relays(&public_key, cx);
-
-        let task: Task<Result<(), Error>> = cx.background_spawn(async move {
-            let urls = write_relays.await;
-
-            // Construct a filter for device key requests
-            let filter = Filter::new()
-                .kind(Kind::Custom(4455))
-                .author(public_key)
-                .since(Timestamp::now());
-
-            // Subscribe to the device key requests on user's write relays
-            client.subscribe_to(&urls, vec![filter], None).await?;
-
-            Ok(())
-        });
-
-        task.detach();
-    }
-
-    /// Request encryption keys from other device
-    fn request_device_keys(&mut self, cx: &mut Context<Self>) {
-        let client = self.client();
-        let public_key = self.identity().read(cx).public_key();
-        let write_relays = self.write_relays(&public_key, cx);
-
-        let app_keys = self.app_keys().clone();
-        let app_pubkey = app_keys.public_key();
-
-        let task: Task<Result<Option<Keys>, Error>> = cx.background_spawn(async move {
-            let signer = client.signer().await?;
-            let public_key = signer.get_public_key().await?;
-
-            let filter = Filter::new()
-                .kind(Kind::Custom(4455))
-                .author(public_key)
-                .pubkey(app_pubkey)
-                .limit(1);
-
-            match client.database().query(filter).await?.first_owned() {
-                Some(event) => {
-                    let root_device = event
-                        .tags
-                        .find(TagKind::custom("P"))
-                        .and_then(|tag| tag.content())
-                        .and_then(|content| PublicKey::parse(content).ok())
-                        .context("Invalid event's tags")?;
-
-                    let payload = event.content.as_str();
-                    let decrypted = app_keys.nip44_decrypt(&root_device, payload).await?;
-
-                    let secret = SecretKey::from_hex(&decrypted)?;
-                    let keys = Keys::new(secret);
-
-                    Ok(Some(keys))
-                }
-                None => {
-                    let urls = write_relays.await;
-
-                    // Construct an event for device key request
-                    let event = EventBuilder::new(Kind::Custom(4454), "")
-                        .tags(vec![
-                            Tag::client(app_name()),
-                            Tag::custom(TagKind::custom("P"), vec![app_pubkey]),
-                        ])
-                        .sign(&signer)
-                        .await?;
-
-                    // Send the event to write relays
-                    client.send_event_to(&urls, &event).await?;
-
-                    Ok(None)
-                }
-            }
-        });
-
-        cx.spawn(async move |this, cx| {
-            match task.await {
-                Ok(Some(keys)) => {
-                    this.update(cx, |this, cx| {
-                        this.set_device_signer(keys, cx);
-                    })
-                    .ok();
-                }
-                Ok(None) => {
-                    this.update(cx, |this, cx| {
-                        this.device_state.update(cx, |this, cx| {
-                            *this = DeviceState::Requesting;
-                            cx.notify();
-                        });
-                        this.listen_device_approval(cx);
-                    })
-                    .ok();
-                }
-                Err(e) => {
-                    log::error!("Failed to request the encryption key: {e}");
-                }
-            };
-        })
-        .detach();
-    }
 }