782 lines
27 KiB
Rust
782 lines
27 KiB
Rust
use std::cell::Cell;
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use std::collections::HashSet;
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use std::path::PathBuf;
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use std::rc::Rc;
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use std::sync::Arc;
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use std::sync::atomic::{AtomicBool, Ordering};
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use instant::Duration;
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use anyhow::{Context as AnyhowContext, Error, anyhow};
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use gpui::{
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App, AppContext, Context, Entity, EventEmitter, Global, IntoElement, ParentElement,
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SharedString, Styled, Subscription, Task, Window, div, relative,
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};
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use nostr_sdk::prelude::*;
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use person::PersonRegistry;
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use settings::AppSettings;
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use smallvec::{SmallVec, smallvec};
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use state::{Announcement, CLIENT_NAME, NostrRegistry, UniversalSigner};
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use theme::ActiveTheme;
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use ui::avatar::Avatar;
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use ui::button::Button;
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use ui::notification::{Notification, NotificationKind};
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use ui::{Disableable, Sizable, StyledExt, WindowExtension, h_flex, v_flex};
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const IDENTIFIER: &str = "coop:device";
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pub fn init(window: &mut Window, cx: &mut App) {
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DeviceRegistry::set_global(cx.new(|cx| DeviceRegistry::new(window, cx)), cx);
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}
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struct GlobalDeviceRegistry(Entity<DeviceRegistry>);
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impl Global for GlobalDeviceRegistry {}
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/// Device event.
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#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
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pub enum DeviceEvent {
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/// A new encryption signer has been set
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Set,
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/// User have not setup encryption key
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NotSet,
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/// The device is requesting an encryption key
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Requesting,
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/// An error occurred
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Error(SharedString),
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}
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impl DeviceEvent {
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pub fn error<T>(error: T) -> Self
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where
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T: Into<SharedString>,
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{
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Self::Error(error.into())
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}
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}
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/// Device Registry
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///
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/// NIP-4e: https://github.com/nostr-protocol/nips/blob/per-device-keys/4e.md
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#[derive(Debug)]
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pub struct DeviceRegistry {
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/// Whether there is a pending request for encryption key approval
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pub pending_request: bool,
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/// Whether an announcement has been made for this device
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pub announcement_existed: Arc<AtomicBool>,
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/// Signer
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signer: Entity<Option<UniversalSigner>>,
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/// Async tasks
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tasks: Vec<Task<Result<(), Error>>>,
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/// Event subscription
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_subscriptions: SmallVec<[Subscription; 2]>,
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}
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impl EventEmitter<DeviceEvent> for DeviceRegistry {}
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impl DeviceRegistry {
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/// Retrieve the global device registry state
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pub fn global(cx: &App) -> Entity<Self> {
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cx.global::<GlobalDeviceRegistry>().0.clone()
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}
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/// Set the global device registry instance
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fn set_global(state: Entity<Self>, cx: &mut App) {
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cx.set_global(GlobalDeviceRegistry(state));
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}
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/// Create a new device registry instance
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fn new(window: &mut Window, cx: &mut Context<Self>) -> Self {
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let nostr = NostrRegistry::global(cx);
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let settings = AppSettings::global(cx);
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let signer = cx.new(|_| None);
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let mut subscriptions = smallvec![];
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subscriptions.push(
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// Subscribe to nostr state events
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cx.observe(&settings, move |this, settings, cx| {
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if settings.read(cx).is_nip4e_enabled(cx) {
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this.get_announcement(cx);
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};
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}),
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);
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subscriptions.push(
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// Observe the user signer
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cx.subscribe(&nostr, move |this, _nostr, event, cx| {
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if event.signer_changed() && settings.read(cx).is_nip4e_enabled(cx) {
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this.get_announcement(cx);
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}
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}),
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);
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cx.defer_in(window, |this, window, cx| {
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this.handle_notifications(window, cx);
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});
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Self {
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signer,
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pending_request: false,
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announcement_existed: Arc::new(AtomicBool::new(false)),
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tasks: vec![],
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_subscriptions: subscriptions,
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}
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}
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fn handle_notifications(&mut self, window: &mut Window, cx: &mut Context<Self>) {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
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let announcement_existed = self.announcement_existed.clone();
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let (tx, rx) = flume::bounded::<Event>(100);
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self.tasks.push(cx.background_spawn(async move {
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let mut notifications = client.notifications();
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let mut processed_events = HashSet::new();
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let current_user = signer.get_public_key_async().await.ok();
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while let Some(notification) = notifications.next().await {
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if let ClientNotification::Message { message, .. } = notification
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&& let RelayMessage::Event { event, .. } = *message
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{
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if !processed_events.insert(event.id) {
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// Skip if the event has already been processed
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continue;
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}
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match event.kind {
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Kind::Custom(10044) if current_user == Some(event.pubkey) => {
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announcement_existed.store(true, Ordering::Relaxed);
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tx.send_async(event.into_owned()).await?;
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}
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Kind::Custom(4454) if current_user == Some(event.pubkey) => {
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tx.send_async(event.into_owned()).await?;
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}
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Kind::Custom(4455) if current_user == Some(event.pubkey) => {
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tx.send_async(event.into_owned()).await?;
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}
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_ => {}
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}
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}
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}
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Ok(())
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}));
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self.tasks.push(cx.spawn_in(window, async move |this, cx| {
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while let Ok(event) = rx.recv_async().await {
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match event.kind {
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Kind::Custom(10044) => {
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this.update_in(cx, |this, _window, cx| {
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this.set_encryption(&event, cx);
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})?;
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}
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// New request event from other device
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Kind::Custom(4454) => {
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this.update_in(cx, |this, window, cx| {
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this.ask_for_approval(event, window, cx);
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})?;
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}
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// New response event from the master device
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Kind::Custom(4455) => {
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this.update(cx, |this, cx| {
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this.extract_encryption(event, cx);
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})?;
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}
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_ => {}
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}
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}
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Ok(())
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}));
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}
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/// Set whether there is a pending request for encryption key approval
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fn set_pending_request(&mut self, pending: bool, cx: &mut Context<Self>) {
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self.pending_request = pending;
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cx.notify();
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}
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/// Get the signer
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pub fn signer(&self, cx: &App) -> Option<UniversalSigner> {
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self.signer.read(cx).clone()
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}
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/// Set the decoupled encryption key for the current user
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fn set_signer(&mut self, new_signer: Keys, cx: &mut Context<Self>) {
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self.signer.update(cx, |this, cx| {
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*this = Some(UniversalSigner::new(new_signer));
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cx.notify();
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});
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cx.emit(DeviceEvent::Set);
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}
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/// Backup the encryption's secret key to a file
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pub fn backup(&self, path: PathBuf, cx: &App) -> Task<Result<(), Error>> {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
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cx.background_spawn(async move {
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let keys = get_keys(&client, &signer).await?;
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let content = keys.secret_key().to_bech32()?;
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if cfg!(target_arch = "wasm32") {
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return Err(anyhow!("Not supported"));
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}
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#[cfg(not(target_arch = "wasm32"))]
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smol::fs::write(path, &content).await?;
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Ok(())
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})
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}
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/// Get device announcement for current user
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pub fn get_announcement(&mut self, cx: &mut Context<Self>) {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
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self.tasks.push(cx.background_spawn(async move {
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let opts = SubscribeAutoCloseOptions::default().exit_policy(ReqExitPolicy::ExitOnEOSE);
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let current_user = signer.get_public_key_async().await?;
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// Construct the filter for the device announcement event
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let filter = Filter::new()
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.kind(Kind::Custom(10044))
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.author(current_user)
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.limit(1);
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client
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.subscribe(filter)
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.close_on(opts)
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.with_id(SubscriptionId::new("nip4e"))
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.await?;
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Ok(())
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}));
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let announcement_existed = self.announcement_existed.clone();
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self.tasks.push(cx.spawn(async move |this, cx| {
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// Wait for 5 seconds
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cx.background_executor().timer(Duration::from_secs(5)).await;
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// Then check if the msg relays have been found
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if announcement_existed.load(Ordering::Acquire) {
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return Ok(());
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}
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this.update(cx, |_this, cx| {
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cx.emit(DeviceEvent::NotSet);
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})?;
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Ok(())
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}));
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}
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/// Create a new device signer and announce it to user's relay list
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pub fn set_announcement(&mut self, keys: Keys, cx: &mut Context<Self>) {
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let task = self.create_encryption(keys, cx);
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self.tasks.push(cx.spawn(async move |this, cx| {
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match task.await {
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Ok(keys) => {
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this.update(cx, |this, cx| {
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this.set_signer(keys, cx);
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this.wait_for_request(cx);
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})?;
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}
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Err(e) => {
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this.update(cx, |_this, cx| {
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cx.emit(DeviceEvent::error(e.to_string()));
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})?;
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}
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}
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Ok(())
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}));
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}
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/// Create new encryption key and announce it to user's relay list
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fn create_encryption(&self, keys: Keys, cx: &App) -> Task<Result<Keys, Error>> {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
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let secret = keys.secret_key().to_secret_hex();
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let n = keys.public_key();
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cx.background_spawn(async move {
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// Construct an announcement event
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let event = EventBuilder::new(Kind::Custom(10044), "")
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.tags(vec![
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Tag::custom("n", vec![n]),
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Tag::custom("client", vec![CLIENT_NAME]),
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])
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.finalize_async(&signer)
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.await?;
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// Publish announcement
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client
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.send_event(&event)
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.to_nip65()
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.ack_policy(AckPolicy::none())
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.await?;
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// Save device keys to the database
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set_keys(&client, &signer, &secret).await?;
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Ok(keys)
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})
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}
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/// Set encryption key from the announcement event
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fn set_encryption(&mut self, event: &Event, cx: &mut Context<Self>) {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
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let announcement = Announcement::from(event);
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let device_pubkey = announcement.public_key();
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// Get encryption key from the database and compare with the announcement
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let task: Task<Result<Keys, Error>> = cx.background_spawn(async move {
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let keys = get_keys(&client, &signer).await?;
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// Compare the public key from the announcement with the one from the database
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if keys.public_key() != device_pubkey {
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return Err(anyhow!("Encryption Key doesn't match the announcement"));
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};
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Ok(keys)
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});
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self.tasks.push(cx.spawn(async move |this, cx| {
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if let Ok(keys) = task.await {
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this.update(cx, |this, cx| {
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this.set_signer(keys, cx);
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this.wait_for_request(cx);
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})?;
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} else {
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this.update(cx, |this, cx| {
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this.request(cx);
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})?;
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}
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Ok(())
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}));
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}
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/// Wait for encryption key requests from now on
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fn wait_for_request(&mut self, cx: &mut Context<Self>) {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
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self.tasks.push(cx.background_spawn(async move {
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let public_key = signer.get_public_key_async().await?;
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let id = SubscriptionId::new("dekey-requests");
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// Construct a filter for encryption key requests
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let filter = Filter::new()
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.kind(Kind::Custom(4454))
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.author(public_key)
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.since(Timestamp::now());
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// Subscribe to the device key requests on user's write relays
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client.subscribe(vec![filter]).with_id(id).await?;
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Ok(())
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}));
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}
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/// Request encryption keys from other device
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pub fn request(&mut self, cx: &mut Context<Self>) {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
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let app_keys_task = get_or_init_app_keys(cx);
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let task: Task<Result<Option<Event>, Error>> = cx.background_spawn(async move {
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let app_keys = app_keys_task.await?;
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let app_pubkey = app_keys.public_key();
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let public_key = signer.get_public_key_async().await?;
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// Construct a filter to get the latest approval event
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let filter = Filter::new()
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.kind(Kind::Custom(4455))
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.author(public_key)
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.pubkey(app_pubkey)
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.limit(1);
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match client.database().query(filter).await?.first_owned() {
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// Found an approval event
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Some(event) => Ok(Some(event)),
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// No approval event found, construct a request event
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None => {
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// Construct an event for device key request
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let event = EventBuilder::new(Kind::Custom(4454), "")
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.tags(vec![
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Tag::custom("P", vec![app_pubkey]),
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Tag::custom("client", vec![CLIENT_NAME]),
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])
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.finalize_async(&signer)
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.await?;
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// Send the event to write relays
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client.send_event(&event).to_nip65().await?;
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Ok(None)
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}
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}
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});
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self.tasks.push(cx.spawn(async move |this, cx| {
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match task.await {
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Ok(Some(event)) => {
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this.update(cx, |this, cx| {
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this.extract_encryption(event, cx);
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})?;
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}
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Ok(None) => {
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this.update(cx, |this, cx| {
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this.wait_for_approval(cx);
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})?;
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}
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Err(e) => {
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this.update(cx, |_this, cx| {
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cx.emit(DeviceEvent::error(e.to_string()));
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})?;
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}
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};
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Ok(())
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}));
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}
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/// Wait for encryption key approvals
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fn wait_for_approval(&mut self, cx: &mut Context<Self>) {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
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cx.emit(DeviceEvent::Requesting);
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self.tasks.push(cx.background_spawn(async move {
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let public_key = signer.get_public_key_async().await?;
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// Construct a filter for device key requests
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let filter = Filter::new()
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.kind(Kind::Custom(4455))
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.author(public_key)
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.since(Timestamp::now());
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// Subscribe to the device key requests on user's write relays
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client.subscribe(filter).await?;
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Ok(())
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}));
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}
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/// Parse the approval event to get encryption key then set it
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fn extract_encryption(&mut self, event: Event, cx: &mut Context<Self>) {
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let app_keys_task = get_or_init_app_keys(cx);
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let task: Task<Result<Keys, Error>> = cx.background_spawn(async move {
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let app_keys = app_keys_task.await?;
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let master = event
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.tags
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.iter()
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.find(|tag| tag.kind() == "P")
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.and_then(|tag| tag.content())
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.and_then(|content| PublicKey::parse(content).ok())
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.context("Invalid event's tags")?;
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let payload = event.content.as_str();
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let decrypted = app_keys.nip44_decrypt_async(&master, payload).await?;
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let secret = SecretKey::from_hex(&decrypted)?;
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let keys = Keys::new(secret);
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Ok(keys)
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});
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self.tasks.push(cx.spawn(async move |this, cx| {
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match task.await {
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Ok(keys) => {
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this.update(cx, |this, cx| {
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this.set_signer(keys, cx);
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})?;
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}
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Err(e) => {
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this.update(cx, |_this, cx| {
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cx.emit(DeviceEvent::error(e.to_string()));
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})?;
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}
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}
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Ok(())
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}));
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}
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/// Approve requests for device keys from other devices
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fn approve(&mut self, event: &Event, window: &mut Window, cx: &mut Context<Self>) {
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let nostr = NostrRegistry::global(cx);
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let client = nostr.read(cx).client();
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let signer = nostr.read(cx).signer();
|
|
|
|
// Get user's write relays
|
|
let event = event.clone();
|
|
let id: SharedString = event.id.to_hex().into();
|
|
|
|
let task: Task<Result<(), Error>> = cx.background_spawn(async move {
|
|
// Get device keys
|
|
let keys = get_keys(&client, &signer).await?;
|
|
let secret = keys.secret_key().to_secret_hex();
|
|
|
|
// Extract the target public key from the event tags
|
|
let target = event
|
|
.tags
|
|
.iter()
|
|
.find(|tag| tag.kind() == "P")
|
|
.and_then(|tag| tag.content())
|
|
.and_then(|content| PublicKey::parse(content).ok())
|
|
.context("Target is not a valid public key")?;
|
|
|
|
// Encrypt the device keys with the user's signer
|
|
let payload = keys.nip44_encrypt_async(&target, &secret).await?;
|
|
|
|
// Construct the response event
|
|
//
|
|
// P tag: the current device's public key
|
|
// p tag: the requester's public key
|
|
let event = EventBuilder::new(Kind::Custom(4455), payload)
|
|
.tags(vec![
|
|
Tag::custom("P", vec![keys.public_key().to_hex()]),
|
|
Tag::public_key(target),
|
|
])
|
|
.finalize_async(&signer)
|
|
.await?;
|
|
|
|
// Send the response event to the user's relay list
|
|
client.send_event(&event).to_nip65().await?;
|
|
|
|
Ok(())
|
|
});
|
|
|
|
self.tasks.push(cx.spawn_in(window, async move |_this, cx| {
|
|
match task.await {
|
|
Ok(_) => {
|
|
cx.update(|window, cx| {
|
|
window.clear_notification_by_id::<DeviceNotification>(id, cx);
|
|
})
|
|
.ok();
|
|
}
|
|
Err(e) => {
|
|
cx.update(|window, cx| {
|
|
window.push_notification(
|
|
Notification::error(e.to_string()).autohide(false),
|
|
cx,
|
|
);
|
|
})
|
|
.ok();
|
|
}
|
|
};
|
|
|
|
Ok(())
|
|
}));
|
|
}
|
|
|
|
/// Handle encryption request
|
|
fn ask_for_approval(&mut self, event: Event, window: &mut Window, cx: &mut Context<Self>) {
|
|
// Ignore if there is already a pending request
|
|
if self.pending_request {
|
|
return;
|
|
}
|
|
self.set_pending_request(true, cx);
|
|
|
|
// Show notification
|
|
let notification = self.notification(event, cx);
|
|
window.push_notification(notification, cx);
|
|
}
|
|
|
|
/// Build a notification for the encryption request.
|
|
fn notification(&self, event: Event, cx: &Context<Self>) -> Notification {
|
|
const MSG: &str = "You've requested an encryption key from another device. \
|
|
Approve to allow Coop to share with it.";
|
|
|
|
let request = Announcement::from(&event);
|
|
let persons = PersonRegistry::global(cx);
|
|
let profile = persons.read(cx).get(&request.public_key(), cx);
|
|
|
|
let entity = cx.entity().downgrade();
|
|
let loading = Rc::new(Cell::new(false));
|
|
let key = SharedString::from(event.id.to_hex());
|
|
|
|
Notification::new()
|
|
.type_id::<DeviceNotification>(key)
|
|
.autohide(false)
|
|
.with_kind(NotificationKind::Info)
|
|
.title("Encryption Key Request")
|
|
.content(move |_this, _window, cx| {
|
|
v_flex()
|
|
.gap_2()
|
|
.text_sm()
|
|
.child(
|
|
div()
|
|
.text_sm()
|
|
.line_height(relative(1.25))
|
|
.child(SharedString::from(MSG)),
|
|
)
|
|
.child(
|
|
v_flex()
|
|
.gap_2()
|
|
.child(
|
|
v_flex()
|
|
.gap_1()
|
|
.text_sm()
|
|
.child(
|
|
div()
|
|
.font_semibold()
|
|
.text_xs()
|
|
.text_color(cx.theme().text_muted)
|
|
.child(SharedString::from("From:")),
|
|
)
|
|
.child(
|
|
div()
|
|
.h_8()
|
|
.w_full()
|
|
.px_2()
|
|
.rounded(cx.theme().radius)
|
|
.bg(cx.theme().elevated_surface_background)
|
|
.child(
|
|
h_flex()
|
|
.gap_2()
|
|
.child(Avatar::new(profile.avatar()).xsmall())
|
|
.child(profile.name()),
|
|
),
|
|
),
|
|
)
|
|
.child(
|
|
v_flex()
|
|
.gap_1()
|
|
.text_sm()
|
|
.child(
|
|
div()
|
|
.font_semibold()
|
|
.text_xs()
|
|
.text_color(cx.theme().text_muted)
|
|
.child(SharedString::from("Client:")),
|
|
)
|
|
.child(
|
|
div()
|
|
.h_8()
|
|
.w_full()
|
|
.px_2()
|
|
.rounded(cx.theme().radius)
|
|
.bg(cx.theme().elevated_surface_background)
|
|
.child(request.client_name()),
|
|
),
|
|
),
|
|
)
|
|
.into_any_element()
|
|
})
|
|
.action(move |_this, _window, _cx| {
|
|
let view = entity.clone();
|
|
let event = event.clone();
|
|
|
|
Button::new("approve")
|
|
.label("Approve")
|
|
.loading(loading.get())
|
|
.disabled(loading.get())
|
|
.on_click({
|
|
let loading = Rc::clone(&loading);
|
|
move |_ev, window, cx| {
|
|
// Set loading state to true
|
|
loading.set(true);
|
|
// Process to approve the request
|
|
view.update(cx, |this, cx| {
|
|
this.approve(&event, window, cx);
|
|
})
|
|
.ok();
|
|
}
|
|
})
|
|
})
|
|
}
|
|
}
|
|
|
|
struct DeviceNotification;
|
|
|
|
/// Get or create new app keys (async, returns a task)
|
|
fn get_or_init_app_keys(cx: &App) -> Task<Result<Keys, Error>> {
|
|
let read = cx.read_credentials(CLIENT_NAME);
|
|
|
|
cx.spawn(async move |cx| {
|
|
if let Ok(Some((_, secret))) = read.await
|
|
&& let Ok(keys) = SecretKey::from_slice(&secret).map(Keys::new)
|
|
{
|
|
return Ok(keys);
|
|
}
|
|
|
|
// No stored keys found or invalid — generate new ones
|
|
let keys = Keys::generate();
|
|
let user = keys.public_key().to_hex();
|
|
let secret = keys.secret_key().to_secret_bytes();
|
|
|
|
cx.update(|cx| {
|
|
let write = cx.write_credentials(CLIENT_NAME, &user, &secret);
|
|
cx.background_spawn(async move {
|
|
if let Err(e) = write.await {
|
|
log::error!("Keyring not available or panic: {e}")
|
|
}
|
|
})
|
|
.detach();
|
|
});
|
|
|
|
Ok(keys)
|
|
})
|
|
}
|
|
|
|
/// Encrypt and store device keys in the local database.
|
|
async fn set_keys(client: &Client, signer: &UniversalSigner, secret: &str) -> Result<(), Error> {
|
|
let public_key = signer.get_public_key_async().await?;
|
|
let content = signer.nip44_encrypt_async(&public_key, secret).await?;
|
|
|
|
// Construct the application data event
|
|
let event = EventBuilder::new(Kind::ApplicationSpecificData, content)
|
|
.tag(Tag::identifier(IDENTIFIER))
|
|
.finalize_async(signer)
|
|
.await?;
|
|
|
|
// Save the event to the database
|
|
client.database().save_event(&event).await?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Get device keys from the local database.
|
|
async fn get_keys(client: &Client, signer: &UniversalSigner) -> Result<Keys, Error> {
|
|
let public_key = signer.get_public_key_async().await?;
|
|
|
|
let filter = Filter::new()
|
|
.kind(Kind::ApplicationSpecificData)
|
|
.identifier(IDENTIFIER)
|
|
.author(public_key);
|
|
|
|
if let Some(event) = client.database().query(filter).await?.first() {
|
|
let content = signer
|
|
.nip44_decrypt_async(&public_key, &event.content)
|
|
.await?;
|
|
|
|
let secret = SecretKey::parse(&content)?;
|
|
let keys = Keys::new(secret);
|
|
|
|
Ok(keys)
|
|
} else {
|
|
Err(anyhow!("Key not found"))
|
|
}
|
|
}
|