623 lines
20 KiB
Rust
623 lines
20 KiB
Rust
use std::collections::{HashMap, HashSet};
|
|
use std::time::Duration;
|
|
|
|
use anyhow::{anyhow, Context as AnyhowContext, Error};
|
|
use gpui::{App, AppContext, Context, Entity, Global, Subscription, Task, Window};
|
|
use nostr_sdk::prelude::*;
|
|
use smallvec::{smallvec, SmallVec};
|
|
use state::{app_name, NostrRegistry, RelayState, DEVICE_GIFTWRAP, TIMEOUT};
|
|
|
|
mod device;
|
|
|
|
pub use device::*;
|
|
|
|
const IDENTIFIER: &str = "coop:device";
|
|
|
|
pub fn init(window: &mut Window, cx: &mut App) {
|
|
DeviceRegistry::set_global(cx.new(|cx| DeviceRegistry::new(window, cx)), cx);
|
|
}
|
|
|
|
struct GlobalDeviceRegistry(Entity<DeviceRegistry>);
|
|
|
|
impl Global for GlobalDeviceRegistry {}
|
|
|
|
/// Device Registry
|
|
///
|
|
/// NIP-4e: https://github.com/nostr-protocol/nips/blob/per-device-keys/4e.md
|
|
#[derive(Debug)]
|
|
pub struct DeviceRegistry {
|
|
/// Device state
|
|
state: DeviceState,
|
|
|
|
/// Device requests
|
|
requests: Entity<HashSet<Event>>,
|
|
|
|
/// 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(window: &mut Window, cx: &mut Context<Self>) -> Self {
|
|
let nostr = NostrRegistry::global(cx);
|
|
let nip65_state = nostr.read(cx).nip65_state();
|
|
|
|
// Construct an entity for encryption signer requests
|
|
let requests = cx.new(|_| HashSet::default());
|
|
|
|
let mut subscriptions = smallvec![];
|
|
|
|
subscriptions.push(
|
|
// Observe the NIP-65 state
|
|
cx.observe(&nip65_state, |this, state, cx| {
|
|
match state.read(cx) {
|
|
RelayState::Idle => {
|
|
this.reset(cx);
|
|
}
|
|
RelayState::Configured(_) => {
|
|
this.get_announcement(cx);
|
|
}
|
|
_ => {}
|
|
};
|
|
}),
|
|
);
|
|
|
|
cx.defer_in(window, |this, _window, cx| {
|
|
this.handle_notifications(cx);
|
|
});
|
|
|
|
Self {
|
|
state: DeviceState::default(),
|
|
requests,
|
|
tasks: vec![],
|
|
_subscriptions: subscriptions,
|
|
}
|
|
}
|
|
|
|
fn handle_notifications(&mut self, cx: &mut Context<Self>) {
|
|
let nostr = NostrRegistry::global(cx);
|
|
let client = nostr.read(cx).client();
|
|
let (tx, rx) = flume::bounded::<Event>(100);
|
|
|
|
cx.background_spawn(async move {
|
|
let mut notifications = client.notifications();
|
|
let mut processed_events = HashSet::new();
|
|
|
|
while let Some(notification) = notifications.next().await {
|
|
if let ClientNotification::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 verify_author(&client, event.as_ref()).await {
|
|
tx.send_async(event.into_owned()).await.ok();
|
|
}
|
|
}
|
|
Kind::Custom(4455) => {
|
|
if verify_author(&client, event.as_ref()).await {
|
|
tx.send_async(event.into_owned()).await.ok();
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
}
|
|
})
|
|
.detach();
|
|
|
|
self.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) => {
|
|
this.update(cx, |this, cx| {
|
|
this.add_request(event, cx);
|
|
})?;
|
|
}
|
|
Kind::Custom(4455) => {
|
|
this.update(cx, |this, cx| {
|
|
this.parse_response(event, cx);
|
|
})?;
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}),
|
|
);
|
|
}
|
|
|
|
pub fn state(&self) -> &DeviceState {
|
|
&self.state
|
|
}
|
|
|
|
/// Reset the device state
|
|
pub fn reset(&mut self, cx: &mut Context<Self>) {
|
|
self.state = DeviceState::Initial;
|
|
self.requests.update(cx, |this, cx| {
|
|
this.clear();
|
|
cx.notify();
|
|
});
|
|
cx.notify();
|
|
}
|
|
|
|
/// Set the decoupled encryption key for the current user
|
|
fn set_signer<S>(&mut self, new: S, cx: &mut Context<Self>)
|
|
where
|
|
S: NostrSigner + 'static,
|
|
{
|
|
let nostr = NostrRegistry::global(cx);
|
|
let signer = nostr.read(cx).signer();
|
|
|
|
self.tasks.push(cx.spawn(async move |this, cx| {
|
|
signer.set_encryption_signer(new).await;
|
|
|
|
// Update state
|
|
this.update(cx, |this, cx| {
|
|
this.set_state(DeviceState::Set, cx);
|
|
this.get_messages(cx);
|
|
})?;
|
|
|
|
Ok(())
|
|
}));
|
|
}
|
|
|
|
/// Continuously get gift wrap events for the current encryption keys
|
|
fn get_messages(&mut self, cx: &mut Context<Self>) {
|
|
let nostr = NostrRegistry::global(cx);
|
|
let client = nostr.read(cx).client();
|
|
let signer = nostr.read(cx).signer();
|
|
let messaging_relays = nostr.read(cx).messaging_relays(cx);
|
|
|
|
let task: Task<Result<(), Error>> = cx.background_spawn(async move {
|
|
let encryption_signer = signer
|
|
.get_encryption_signer()
|
|
.await
|
|
.context("Signer not found")?;
|
|
|
|
let public_key = encryption_signer.get_public_key().await?;
|
|
let urls = messaging_relays.await;
|
|
|
|
let filter = Filter::new().kind(Kind::GiftWrap).pubkey(public_key);
|
|
let id = SubscriptionId::new(DEVICE_GIFTWRAP);
|
|
|
|
// Construct target for subscription
|
|
let target: HashMap<&RelayUrl, Filter> =
|
|
urls.iter().map(|relay| (relay, filter.clone())).collect();
|
|
|
|
client.subscribe(target).with_id(id).await?;
|
|
log::info!("Subscribed to encryption gift-wrap messages");
|
|
|
|
Ok(())
|
|
});
|
|
|
|
task.detach();
|
|
}
|
|
|
|
/// Set the device state
|
|
fn set_state(&mut self, state: DeviceState, cx: &mut Context<Self>) {
|
|
self.state = state;
|
|
cx.notify();
|
|
}
|
|
|
|
/// Add a request for device keys
|
|
fn add_request(&mut self, request: Event, cx: &mut Context<Self>) {
|
|
self.requests.update(cx, |this, cx| {
|
|
this.insert(request);
|
|
cx.notify();
|
|
});
|
|
}
|
|
|
|
/// 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 task: Task<Result<Event, Error>> = cx.background_spawn(async move {
|
|
let signer = client.signer().context("Signer not found")?;
|
|
let public_key = signer.get_public_key().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(filter)
|
|
.timeout(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();
|
|
|
|
// Generate a new device keys
|
|
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 {
|
|
// Construct an announcement event
|
|
let builder = EventBuilder::new(Kind::Custom(10044), "").tags(vec![
|
|
Tag::custom(TagKind::custom("n"), vec![n]),
|
|
Tag::client(app_name()),
|
|
]);
|
|
let event = client.sign_event_builder(builder).await?;
|
|
|
|
// Publish announcement
|
|
client.send_event(&event).to_nip65().await?;
|
|
|
|
// Save device keys to the database
|
|
set_keys(&client, &secret).await?;
|
|
|
|
Ok(())
|
|
});
|
|
|
|
cx.spawn(async move |this, cx| {
|
|
if task.await.is_ok() {
|
|
this.update(cx, |this, cx| {
|
|
this.set_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 {
|
|
if let Ok(keys) = get_keys(&client).await {
|
|
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_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 task: Task<Result<(), Error>> = cx.background_spawn(async move {
|
|
let signer = client.signer().context("Signer not found")?;
|
|
let public_key = signer.get_public_key().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(filter).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 task: Task<Result<(), Error>> = cx.background_spawn(async move {
|
|
let signer = client.signer().context("Signer not found")?;
|
|
let public_key = signer.get_public_key().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(filter).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 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().context("Signer not found")?;
|
|
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 => {
|
|
// Construct an event for device key request
|
|
let builder = EventBuilder::new(Kind::Custom(4454), "").tags(vec![
|
|
Tag::client(app_name()),
|
|
Tag::custom(TagKind::custom("P"), vec![app_pubkey]),
|
|
]);
|
|
let event = client.sign_event_builder(builder).await?;
|
|
|
|
// Send the event to write relays
|
|
client.send_event(&event).to_nip65().await?;
|
|
|
|
Ok(None)
|
|
}
|
|
}
|
|
});
|
|
|
|
cx.spawn(async move |this, cx| {
|
|
match task.await {
|
|
Ok(Some(keys)) => {
|
|
this.update(cx, |this, cx| {
|
|
this.set_signer(keys, cx);
|
|
})
|
|
.ok();
|
|
}
|
|
Ok(None) => {
|
|
this.update(cx, |this, cx| {
|
|
this.set_state(DeviceState::Requesting, cx);
|
|
})
|
|
.ok();
|
|
}
|
|
Err(e) => {
|
|
log::error!("Failed to request the encryption key: {e}");
|
|
}
|
|
};
|
|
})
|
|
.detach();
|
|
}
|
|
|
|
/// Parse the response event for device keys from other devices
|
|
fn parse_response(&mut self, event: Event, cx: &mut Context<Self>) {
|
|
let nostr = NostrRegistry::global(cx);
|
|
let app_keys = nostr.read(cx).app_keys().clone();
|
|
|
|
let task: Task<Result<Keys, Error>> = cx.background_spawn(async move {
|
|
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(keys)
|
|
});
|
|
|
|
cx.spawn(async move |this, cx| {
|
|
match task.await {
|
|
Ok(keys) => {
|
|
this.update(cx, |this, cx| {
|
|
this.set_signer(keys, cx);
|
|
})
|
|
.ok();
|
|
}
|
|
Err(e) => {
|
|
log::error!("Error: {e}")
|
|
}
|
|
};
|
|
})
|
|
.detach();
|
|
}
|
|
|
|
/// Approve requests for device keys from other devices
|
|
#[allow(dead_code)]
|
|
fn approve(&mut self, event: Event, cx: &mut Context<Self>) {
|
|
let nostr = NostrRegistry::global(cx);
|
|
let client = nostr.read(cx).client();
|
|
|
|
let task: Task<Result<(), Error>> = cx.background_spawn(async move {
|
|
let signer = client.signer().context("Signer not found")?;
|
|
|
|
// Get device keys
|
|
let keys = get_keys(&client).await?;
|
|
let secret = keys.secret_key().to_secret_hex();
|
|
|
|
// Extract the target public key from the event tags
|
|
let target = event
|
|
.tags
|
|
.find(TagKind::custom("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 = signer.nip44_encrypt(&target, &secret).await?;
|
|
|
|
// Construct the response event
|
|
//
|
|
// P tag: the current device's public key
|
|
// p tag: the requester's public key
|
|
let builder = EventBuilder::new(Kind::Custom(4455), payload).tags(vec![
|
|
Tag::custom(TagKind::custom("P"), vec![keys.public_key()]),
|
|
Tag::public_key(target),
|
|
]);
|
|
let event = client.sign_event_builder(builder).await?;
|
|
|
|
// Send the response event to the user's relay list
|
|
client.send_event(&event).to_nip65().await?;
|
|
|
|
Ok(())
|
|
});
|
|
|
|
task.detach();
|
|
}
|
|
}
|
|
|
|
/// Verify the author of an event
|
|
async fn verify_author(client: &Client, event: &Event) -> bool {
|
|
if let Some(signer) = client.signer() {
|
|
if let Ok(public_key) = signer.get_public_key().await {
|
|
return public_key == event.pubkey;
|
|
}
|
|
}
|
|
false
|
|
}
|
|
|
|
/// Encrypt and store device keys in the local database.
|
|
async fn set_keys(client: &Client, secret: &str) -> Result<(), Error> {
|
|
let signer = client.signer().context("Signer not found")?;
|
|
let public_key = signer.get_public_key().await?;
|
|
|
|
// Encrypt the value
|
|
let content = signer.nip44_encrypt(&public_key, secret).await?;
|
|
|
|
// Construct the application data event
|
|
let event = EventBuilder::new(Kind::ApplicationSpecificData, content)
|
|
.tag(Tag::identifier(IDENTIFIER))
|
|
.build(public_key)
|
|
.sign(&Keys::generate())
|
|
.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) -> Result<Keys, Error> {
|
|
let signer = client.signer().context("Signer not found")?;
|
|
let public_key = signer.get_public_key().await?;
|
|
|
|
let filter = Filter::new()
|
|
.kind(Kind::ApplicationSpecificData)
|
|
.identifier(IDENTIFIER)
|
|
.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);
|
|
|
|
Ok(keys)
|
|
} else {
|
|
Err(anyhow!("Key not found"))
|
|
}
|
|
}
|